you weigh out an antacid tablet and determine the mass to be 1.1990 g. after taking a 0.2455 g sample of the antacid tablet, you dissolve it in 25.00 ml of a 0.1006 m solution of hydrochloric acid in a 250.0 ml erlenmeyer flask. after heating the solution to get rid of carbon dioxide, you titrate the leftover hydrochloric acid in the solution in the erlenmeyer flask with a 0.09913 m solution of sodium hydroxide and determine that it takes 14.71 ml of the sodium hydroxide solution to react with the leftover hydrochloric acid in solution. determine the milligrams of calcium carbonate in the sample of antacid tablet and then determine the milligrams of calcium carbonate in the entire antacid tablet. 2. what indicator will be used for this titration reaction? what color change will occur?

Answers

Answer 1

Convert moles of  HCl used in the neutralization of the tablet to moles of CaCO3 using the coefficients in the balanced equation. That will be moles of CaCO3 is 0.0005284 moles.

1. CaCO3 + 2HCl ==> CaCl2 + H2O + CO2

Moles of HCl added initially = M x L = 0.002515  moles

Moles of NaOH needed to neutralize the excess HCl = M x L = 0.0014582 moles.

Moles of HCl used for the tablet is

0.002515 - 0.0014582 =  0.0010568 moles

Convert moles of  HCl used in the neutralization of the tablet to moles of CaCO3 using the coefficients in the balanced equation. That will be moles of CaCO3 = (1/2 x moles HCl) = 0.0005284 moles

Mass of CaCO3 = 0.05284g in 1.1990 g tablet

Then in 0.2455 g tablet = 0.0065187 g = 6.5187 mg

2. Both HCl and NaOH are strong acid and  strong bases respectively, an indicator like phenolphthalein is used which can  become colourless in acidic and neutral conditions and pink coloured under alkaline conditions.

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Related Questions

How does the parathyroid gland respond if blood calcium drops below a certain level?
a) By releasing less hormone.
b) By releasing more hormone.
c) By abruptly releasing less hormone.
d) By abruptly releasing large amounts of hormone.

Answers

b) by releasing more hormone
b) by realeasing more hormone

If calcium blood levels are too low, your parathyroid glands will release PTH into the blood. This causes calcium levels to rise. If calcium blood levels are too high, these glands will stop making PTH. PTH levels that are too high or too low can cause serious health problems.

Two bowling balls are rolling down a hill. It is determined that they each have the same amount of kinetic energy. However, one ball weighs twice as much as the other. What can you conclude about the speed of each ball based on this information? Explain.

Answers

If two bowling balls are rolling down a hill. It is determined that they each have the same amount of kinetic energy. However, one ball weighs twice as much as the other. Then the body with lighter mass have greater speed than the heavier body.

What is Kinetic motion?

Kinetic energy is defined as the half of the product of massof the object and square of the velocity by which body move.

Mathematically, it may be defined as the

K. E = 1/2 × mv²

v² = 2K. E / m

Since, we noticed that velocity is inversely proportional to the mass of the body. Therefore, light body move with greater kinetic energy than the heavier body.

Thus, we concluded that two bowling balls are rolling down a hill. It is determined that they each have the same amount of kinetic energy. However, one ball weighs twice as much as the other. Then the body with lighter mass have greater speed than the heavier body.

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4. A chemist is analyzing a sample of an unknown gas. A 0.240-gram sample of a gas has a volume of 336 mL when measured under a pressure of 1520 mm Hg at 273 °C. Find the molecular weight (molar mass

Answers

1 g is molecular weight or atomic mass of hydrogen. when  a 0.240-gram sample of a gas has a volume of 336 mL when measured under a pressure of 1520 mm Hg at 273 °C

volume=336 mL

pressure= 1520 mm

temperature=546 K

given mass, m=0.240-gram

M=(molar mass

R= 8.2

PV=mRT/M

M=mRT/PV

M=1074/51072

M=1 g

The quantity of substance that makes up an element's atom is known as its atomic mass. One-twelfth of the mass of the carbon-12 atom, with an assigned atomic mass of 12 units, is expressed as a multiple of 1.992646547 1023 gram, or in other words, 1.992646547 gram. One atomic mass unit is equivalent to 1.660539040 1024 grams on this scale (amu). The atomic mass unit is sometimes referred to as the dalton in honor of English scientist John Dalton (Da).

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if a sample of rock contains 0.009 percent gold by mass, how much nacn is needed to extract the gold

Answers

A particular ore employed in this study needed a concentration of 100 g/L (200 lb/st solution or 600 lb/st ore) NaCN to extract gold at a rate of over 90 percent.

In how much cyanide does gold mining take place?

Since the 1970s, cyanide leaching, often known as "cyanidation," has been the main method used to extract gold. In this method, sodium cyanide is used to selectively dissolve gold from ore in a solution that contains between 100 and 500 parts per million, or 0.01% and 0.05% cyanide.

Where is cyanide most prevalent?

Certain bacteria, fungus, and algae can generate cyanides. Additionally, cyanides can be found in things like tapioca, spinach, bamboo shoots, almonds, lima beans, fruit pits, and car exhaust.

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A scuba diver's tank contains 1.47 moles of 02 and 5.53 moles of He at the end
of a dive. If the pressure of the gas mixture is 12.1 atm, what is the partial
pressure of He in the tank?



2.19 atm
2.54 atm
9.56 atm
15.3 atm

Answers

The partial pressure of He in the tank, given that the tank contains 1.47 mole of O₂ and 5.53 moles of He is 9.56 atm

How do I determine the partial pressure of He?

To obatin the partial pressure of He in the tank, we'll begin by obtaining the mole fraction of He in the tank. This is illustrated below:

Mole of O₂ = 1.47 mole Mole of He = 5.53 moles Total mole = 1.47 + 5.53 = 7 molesMole fraction of He =?

Mole fraction of He = Mole of He / total mole

Mole fraction of He = 5.53 / 7

Mole fraction of He = 0.79

Finally, we shall determne the partial pressure of He in the tank. Details below

Mole fraction of He = 0.79Total pressure of gas mixture = 12.1 atmPartial pressure of He =?

Partial pressure of He = mole fraction of He × total pressure

Partial pressure of He = 0.79 × 12.1

Partial pressure of He = 9.56 atm

Thus, we can conclude that the partial pressure of He is 9.56 atm

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A 0. 1326 g sample of magnesium was burned in an oxygen bomb calorimeter. The total heat capacity of the calorimeter plus water was 5,760 j/°c. If the temperature rise of the calorimeter with water was 0. 570°c, calculate the enthalpy of combustion of magnesium. Mg(s) + 1/2o2(g) →mgo(s).

Answers

The enthalpy of combustion of magnesium is -602KJ/mol

A combustion reaction is a reaction in which a substance reacts with the oxygen gas, releasing energy in the form of light and heat. Combustion reactions generally involves O2 as one reactant.

Heat capacity is defined as the amount of heat required to raise the temperature of the substance by one degree Celsius. Whereas the specific heat capacity of a substance is defined as the heat capacity per unit mass and it is measured in joules per kilogram per degree.

To calculate the heat absorbed by the calorimeter we use;

q = C × ΔT

q = 5760 × 0.570

q = 3283.2 J

So, 0.1326 grams of Magnesium releases energy q = 3283.2 J

Then 1 gram of Magnesium releases = 3283.2 ÷ 0.1326 = 24760 J/g

1 mol Mg = 24.31 grams

Hence, 1 mol Mg releases energy = 24.31 × 24760 = 601916 J/mol

⇒ 601.92 KJ/mol ≈ 602KJ/mol

Heat of combustion is always negative so, q = -602KJ/mol.

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What conditions existed for this type of fossil to form

Answers

must be dead and must be brokin down in the exacto form It must be

if a food dye has an absorbance value of 1.00 at 598 nm when a 1.074x10-5 m sample was measured in a 1 cm cuvette, what can the dye's molar absorptivity, in m-1cm-1, be estimated as?

Answers

Each solution contains a different dye concentration in moles. Utilize your measured absorbance values and the Beer-Lambert Law equation (A = bc).

A 1 molar solution is what?

In order to create a 1 molar (M) solution, 1.0 GMW of the chemical must be dissolved in 1 liter of water. 58.44 g make up a 1M solution of NaCl. Example: Enzyme histochemistry routinely employs HCl.

What does molar unit mean?

The most common unit for molarity in chemistry is the number of moles per liter, given by the unit sign mol/L or moldm3 in SI units. One molar, or 1 M, of a solution's content is defined as one mol/L.

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how many grams of water would you need to make an 89% plutonium aqueous solution by mass. the total solution is 3500 grams.

Answers

325 g of water would be need to make an 89% plutonium aqueous solution by mass, if the total solution is 3500 grams.

This problem is solved by using the concept of total mass percentage

Total mass percentage can be given as

Mass percentage = sum of mass percentage of elements in solution.

100% = 89% of plutonium aqueous solution by mass+ x V of water solution by mass

(100 - 89)% = x% of water solution by mass

11 % = x% of water solution by mass

mass percentage of water =( mass of water / mass of total solution) × 100

11 / 100 = mass of water / mass of total solution

mass of water =( 11/ 100) × 3500

= 325 g.

Thus, we concluded that 325 g of water would be need to make an 89% plutonium aqueous solution by mass, if the total solution is 3500 grams.

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A certain cation has five atoms and an overall charge of +1. Which of the following combinations of tformal charges on the five atoms is indicative of the "best" Lewis
structure?
O-1, +1, 0, 0, +1
O 0, 0, 0, +1,0
O 0, 0, 0, +2, -1
O 0, 0, 0, 0, 0

Answers

FCC unit cell consist of O,0,0,0,+1,0 atom.

What is atom?
Each atom is made up of a nucleus one and or more electrons that are bound to it. One or even more protons and a significant number of neutrons make up the nucleus. Only the most prevalent type of hydrogen is neutron-free. Atoms that are neutral or ionised make up every solid, liquid, gas, as well as form of plasma. Atoms are incredibly tiny, measuring typically 100 picometers across. Due to quantum effects, they are so small that it is impossible to predict their behaviour with sufficient accuracy using classical physics, as would be the case, for example, if they were tennis balls.

FCC stand as a face centred cubic unit cell structure
Consists of atom arrange in a cube where is corner of the cube has a friction of an atom with 6 additional fool at terms situated at the middle of every cube.

cube has 8 corners and 6 faces
Each atom at the corner contributes 1/8 of itself to a particular cubic crystal lattice.
A 8 atoms × 1/8 = 1 Atom ( at corners)
Each atom at a face centre contributes 1/2 of itself to a particular cubic crystal lattice.
6 atom × 1/2 = 3 atoms
Total atoms in a fcc lattice is 4 atoms.


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How many grams of copper are in
3.42 moles of copper? The molar
mass of copper is 63.55 g/mol.

Answers

Explanation:

Answer : The mass of copper is 217.3 grams.

Explanation : Given,

Moles of copper = 3.42 mole

Molar mass of copper = 63.55 g/mole

Formula used :

Now put all the given values in this formula, we get:

Therefore, the mass of copper is 217.3 grams.

Draw the structure of the major organic product formed in the reaction of 1−methylcyclohexene with bromine in water.

Answers

The product form in the reaction of 1−methylcyclohexene with Bromine in water is trans-2-Bromo-1-methylcyclohexanol.

The molecular formula is C7H13BrO.

The Molecular Weight is 193.08200.

Synonyms of the product formed are as follow:

-2c-bromo-1r-methyl-cyclohexanol-(1)

trans-2-bromo-1-methylcylohexanol

1-Methyl-2trans-brom-cyclohexanol

trans-2-bromo-1-methylcyclohexanol

-2c-Brom-1r-methyl-cyclohexanol-(1)

For the structure check the image.

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Strontium-90 has a half-life of 28 years. If a 8.00 mg sample were stored for 112 years, what mass of 90Sr would remain?

Answers

The mass of Strontium-90 left after 112 years with an half-life of 28 years is 0.5 mg.

What is mass?

Mass can be defined as the quantity of matter a body contains.

To calculate the mass of Strontium-90 left, we use the formula below.

Formula:

R' = R/([tex]2^{n/t}[/tex])............... Equation 1

Where:

R' = Mass of Strontium-90 leftR = Original mass of Strontium-90n = Total time t = Half-life of Strontium-90

From the question,

Given:

R = 8.00 mgt = 28 yearsn = 112 years

Substitute these values into equation 1

R = 8/([tex]2^{112/28}[/tex])R = 8/2⁴R = 8/16R = 0.5 mg

Hence, the mass of Strontium-90 left is 0.5 mg.

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the elements phosphorous and oxygen have their percentage composition to be 43.64% and 56.36% calculate the empirical formula

Answers

The empirical formula of the compound would be  [tex]P_2O_5[/tex].

What is the empirical formula?

The empirical formula of a compound is the chemical formula of the compound based on the simplest whole-number ratio of its component atoms.

The compound in question contains phosphorus, P, and oxygen, O.

P = 43.64

O = 56.36

First, let's find the moles of each atom by dividing their percentage composition by their respective molar weights.

P = 43.64/30.97

  = 1.4

O = 56.36/16

   = 3.5

Next would be to divide the moles by the smallest mole.

P = 1.4/1.4

  = 1

O = 3.5/1.4

   = 2.5

Thus, the smallest, whole-number ratio of the two atoms would be 2:5. In other words, the empirical formula of the compound is [tex]P_2O_5[/tex].

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The characteristics of two unknown intermolecular forces, C and D, are compared in the table.


Intermolecular Forces
C D
Occurs between polar asymmetrical molecules Occurs between non-polar or polar symmetric molecules


Which of the following conclusions about the two intermolecular forces is correct?



a
C represents ion-dipole forces, and D represents dipole-dipole forces

b
C represents dipole-dipole forces, and D represents London dispersion forces

c
C represents London dispersion forces, and D represents ion-dipole forces

d
C represents hydrogen bonding, and D represents London dispersion forces

Answers

Answer: represents London dispersion force and B represents hydrogen bonding

Explanation:

which criteria are important in determining the lewis structure for a molecule that is the greatest contributor to the resonance hybrid? select all that apply. g

Answers

The greatest contributor to the resonance hybrid is the resonance form with the smallest formal charges. The main resonance contributor is the one with the lowest energy. The question was incomplete, this is a general answer.

Resonance contributors

We can write some Lewis structure for a molecule, differing only in the positions of the electrons. The most stable structure contributes the most to the resonance hybrid. Any of a set of Lewis structures that differ only in the distribution of electrons in covalent bonds and single pairs. the weighted average of the resonance contributors gives the hybrid resonance. It often occurs in structures when the double bond lies opposite the single bond and forms two identical Lewis structures. The point of this is that double bonds and single bonds from one molecular structure can move or exchange positions so as to form a structure that is identical to the previous molecular structure. For example on O₃ (ozone).

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Determine the Unknown Mixture
Gas A
Gas B
Gas C
Gas D
Unknown
mixture
Here spectra of four
different gases.
What gas/gases does the
unknown gas mixture
have?

Answers

The unknown gas is the mixture of gas A and gas D as interpreted by the spectra.

What is Emission spectra of gases?

The pattern of lines created when light is split into its many frequencies by a prism is known as an emission spectrum. Only specific light wavelengths are emitted when gases are heated (an emission spectrum). Each gas has different wavelength. In a spectrum, an emission line can be seen if a source emits radiation at a particular wavelength. This emission happens when an excited atom, element, or molecule switches to a lower-energy form. Some of the light that passes through a cold item (gas or solid) can be absorbed. The amount of energy that an object's atoms possess is determined by the object's temperature.

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Which of the following ionic compounds has the highest (most negative) lattice energy? SrF2 MgF2 SrI2 KCl NaF LiF CaCl2

Answers

Highest lattice energy present in MgF₂.

Ionic compounds having following properties has highest lattice energy.

(i) Ions having small radii

(ii) Compound having high charge

KCl, NaF and LiF all are +1 and -1 charges respectively

But in SrF₂, MgF₂ and CaCl₂  , each cation is dipositive

But size order of cations is:

Mg < Ca< Sr

Thus, Answer is MgF₂.

In chemistry, the lattice energy is the energy exchange upon formation of one mole of a crystalline ionic compound from its constituent ions, which can be assumed to initially be within the gaseous kingdom. It's far a measure of the cohesive forces that bind ionic solids.

Lattice energy may be described because the energy required to transform one mole of an ionic stable into gaseous ionic parts. Alternatively, it may be described as the power that ought to be provided to one mole of an ionic crystal with a purpose to separate it into gaseous ions in a vacuum thru an endothermic system.

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what is the molarity of 25 ml an acetic acid solution that contains 0.02 moles? report your answer to three decimal places.

Answers

Answer:

0.800M

Explanation:

First, convert mL to liters:

25mL x 1L/1000mL = 0.025 L

Molarity means mol/L, so divide number of mol by L:

0.02mol/0.025L = 0.8M

Add decimal places:

0.800M

The molarity is an important method which is used to calculate the concentration of a solution. The molarity of 25 ml an acetic acid solution that contains 0.02 moles is 0.8 mol  L⁻¹.

What is molarity?

The molarity of a solution is defined as the number of moles of the solute present per litre of the solution. It can be represented as 'M' and the unit of molarity is mol L⁻¹. It is usually employed in a binary solution.

The equation used to calculate the molarity is:

Molarity = Number of moles of the solute / Volume of the solution in litres

Here number of moles = 0.02 moles

Here 1 L = 1000 mL

Volume = 25 ml = 0.025 L

M = 0.02 / 0.025

M = 0.8 mol  L⁻¹

Thus the molarity of the solution is 0.8 mol  L⁻¹.

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Temperature is a measure of the _______ energy of the molecules within a substance.

Answers

Temperature is a measure of the kinetic energy of the molecules within a substance.

Temperature measures the average kinetic electricity of the particles in a substance. Thermal power measures the whole kinetic energy of the debris in a substance. The greater the motion of debris, the better a substance's temperature and thermal energy.

All molecules have electricity and are in steady motion, they vibrate. This vibration is the energy of the problem and can be measured as temperature. most matter expands when heated, and whilst cooled it contracts. The greater electricity something has, the better its temperature and the greater its molecules are vibrating.

The time period is commonly used for the electricity levels of electrons in atoms, ions, or molecules- which might be sure via the electric subject of the nucleus. Also can seek advice from energy tiers of nuclei or vibrational or rotational energy tiers in molecules.

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Write two half‑reactions to describe each of these metal displacement reactions. Include phase symbols. Mg(s)+cobr2(aq)⟶mgbr2(aq)+co(s).

Answers

The two half reaction for the displacement reactions are the oxidation and reduction reactions.

A displacement reaction is the one where the atoms or the set of atoms is been displaced by another atom in a molecule of the compound. For example, when iron is added to a copper sulphate solution, it displaces the copper metal. A + B-C → A-C + B.

An oxidation-reduction (redox) reaction is a type of chemical reaction that generally involves a transfer of electrons between any two species. An oxidation-reduction reaction is any chemical reaction in which the oxidation number of a molecule, atom, or ion changes by gaining or losing an electron.

Mg → [tex]Mg^{2+}[/tex]+ 2e- Oxidation half reaction

[tex]Co^{2+}[/tex]+2e- → Co - Reduction half reaction

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a large beaker of water is placed on a scale, and the scale reads 40 n. a block of wood with a weight of 10 n is then placed in the beaker. it floats with exactly half of its volume submerged. assuming that none of the water spilled out of the beaker when the block was added, what does the scale read now?

Answers

Assuming that none of the water spilled out of the beaker when the block was added, then the scale reads 50 N.

What is buoyancy?

Buoyancy is also called as upthrust. It is an upward force exerted by a fluid that opposes the weight of a partially/ fully immersed object. In column of fluid, pressure increases with depth due to the weight of the overlying fluid.

Given that scale reads 40 N

A block of wood of weight 10 N is placed in beaker,

Now, the scale will read 50 N as it has the weight of both water and wood.  No water is spilled out of beaker when block was added and wood is also present .

Now, total reading on scale is 40+10 =50 N

Although effective weight of wood is less as buoyancy is acting on it.

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suppose one could keep the rate of growth of new grains constant and increase the rate of nucleation. would the recrystallized grain size increase or decrease? motivate your answer

Answers

the recrystallized grain size will decreases on in the recrystallization reaction.

Recrystallization is a technique used to purify chemicals. This is done by dissolving a mixture of a compound and impurities in an appropriate solvent, the desired compound or impurities can be removed from the solution, leaving the other behind.

Recrystallization does not involve a chemical reaction. In this process the crude product is simply taken into solution, and then the conditions are changed in order to allow crystals to re-form. Recrystallization produces a much purer, final product at the end.

As in the above case given if rate of Nucleation increases keeping the  rate of new grains growth constant, the ratio will increase and grain size will decrease.

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explain why cf4 and xef4 are nonpolar compounds (have no net dipole moments) while sf4 is polar (has a net dipole moment)

Answers

CF₄ and XeF₄ are nonpolar compounds (have no net dipole moments) while SF₄ is polar (has a net dipole moment)

The Lewis structure for CF₄ and XeF₄ Both of them have symmetrical shapes and arrangements of polar bonds. This results in the cancellation of all polar vectors and a net dipole moment of zero. These are non-polar.

CF₄  is a tetrahedron with carbon at the center and fluorine at the four points. The dipole moments of the individual bonds cancel each other out.

Each of the other molecules is also a tetrahedron. Fluorine is more electronegative than chlorine, which is more electronegative than hydrogen. The dipole vector for each bond is the difference between the polarities of the two atoms. The dipole moment of the entire molecule is the vector sum of all of the individual bond dipole moments.

CF₄ and XeF₄ cancels itself out and has no dipole.

SF₄ on the other hand have The lone pair of electrons causes this compound to have a net dipole moment. It has no opposite pair of electrons that could cancel its pull, this results in it being polar.

therefore, CF₄ and XeF₄ are nonpolar compounds (have no net dipole moments) while SF₄ is polar (has a net dipole moment)

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Element X is an element in period 5. Identify X given that in the molecule XF2, it exhibits hybridization sp3. Indicate the symbol and not the name of the element. Explain.

Answers

Group 5 Element X in the molecule XF2 is Sb.

Periodic table is the arrangement of the row and columns of the chemical elements. In the periodic table, period 5 contain 18 elements. These are Rb, sr, Y, Zr, Nb, Mo, Tc,Ru,Rh,Pd,Ag,Cd,In,Sn,Sb,Te,I,Xe.

The Sb atoms are hybridizes with sp3 to form a stable hexagon ring structure. Sb can act as a central atom in SbF2. In this structure it is bonded with 3 F molecule. This has no lone pair of electrons. Sb is a toxic chemical element. Its atomic number is 51.this is the additives for chlorine and bromine found in many commercial and domestic products.it improves the properties of the alloy.

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I only need 2,5,6,7,8,9,10,11 this is honors chem

Answers

2,5,6,7,10,11
Also there’s no question..

Question 1-1
Which word most accurately represents a medium?
A.radio
B.sound
C.space
D.time

Answers

Answer: C.Space

Explanation:

I had this question, so it should be correct.

Calculate the amount of heat neceary to raie the temperature of 47. 8 g ethylene glycol

Answers

Th amount of heat necessary to raise the temperature of 47.8g ethylene glycol is 47.8J.

To calculate the amount of heat transferred (q) is the product of specific heat capacity(C), mass of substance(m) and the change in temperature(ΔT).

q=m×c×ΔT

Here m=47.8g , C=1K, ΔT= 1K

q= 47.8J

What is ethylene glycol?

Ethylene glycol is a water-absorbing synthetic liquid. It has no odour and a sweet taste. Ethylene glycol is used in the manufacture of antifreeze and deicing solutions for automobiles, aeroplanes, and boats. It's also found in hydraulic brake fluids and inks used in stamp pads, ballpoint pens, and printing presses.

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Based on the balanced chemical equation for reaction 5 what compounds were being removed when the recovered copper product was washed repeatedly with water?.

Answers

Based on the balanced chemical equation for reaction 5 aluminum III ion and copper II sulphate compounds were being removed when the recovered copper product was washed repeatedly with water

A chemical equation consist of reactant product and an arrow showing the direction of reaction and the equation in which number of atom of all the molecules is equal on both side of the equation is known as balanced chemical equation and when recovered copper product was washed repeatedly with water the compound removed during those washes were aluminum II ion and copper II sulphate

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calculate the amount of heat needed to boil of octane (), beginning from a temperature of . be sure your answer has a unit symbol and the correct number of significant digits.'

Answers

The amount of heat needed is 85.0 kJ.

Melting point determination is the most commonly used thermal analysis to characterize solid crystalline materials. It is used in R&D and quality control in various industries to identify solid crystalline substances and to ensure their purity. The heat capacity ratio is calculated by dividing the heat capacity at constant pressure by the heat capacity at constant volume.

Calculation

mass = 111g

temperature = 25.1⁰C.

Heat = msT

= 85.0 kJ.

Specific heat is the amount of heat required to raise 1 gram of a substance by 1 degree Celsius or Kelvin. The enthalpy change is given and the symbol indicates the enthalpy change. The heat of formation and heat of reaction are two forms of enthalpy. The boiling points of liquids can be determined using the capillary method. In this method a reverse capillary tube is placed in the liquid of interest and the liquid is heated.

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Disclaimer:- your question is incomplete, please see below for the complete question.

Calculate the amount of heat needed to boil 111 g of octane (C8H18), beginning from a temperature of 25.1⁰C. be sure your answer has a unit symbol and the correct number of significant digits.

Other Questions
The reason that most seti programs choose to listen at microwave radio frequencies is that. 2/3+____=5/6 what Is the answer select the single best answer. identify the relationship in the following pair. do the drawings represent constitutional isomers or stereoisomers, or are they just different ways of drawing the same compound? if they are stereoisomers, are they enantiomers or diastereomers? h571915x and h571915b james is 9 years old. which stage of development is he currently in, according to piaget?sensorimotorpreoperationsconcrete operationsformal operations In a triangle with integer side lengths, one side is three times as long as a second side, and the length of the third side is 15. What is the greatest possible perimeter of the triangle? SUPER EASY ASAP !!!!!! Triangle DOG i an iocele with bae angle D and G. Line egment DO i one more than the quare of a number, and line egment OG i two le than four time a number. Line egment DG i three le than twice the number. Find the number, the length of the leg, and the length of the bae 3. How did the Great Migration contribute to thedevelopment of the Harlem Renaissance?O A. Many African Americans returned to theSouth after they achieved fame and successduring the Harlem Renaissance.B. Many African Americans left the South tosettle in the North, drawn by the culturalmovement of the Harlem Renaissance.O C. Many African Americans returned to theSouth to reclaim their history, leading to thedevelopment of the Harlem Renaissance. D. Many African Americans left the South toforge a new path for themselves in theNorth, leading to the development of theHarlem Renaissance. By how much have temperatures already risen, on average, from pre-industrial levels?. If 250 ml of methane, ch4, effuses through a small hole in 28 s, the time required for the same volume of helium to pass through the hole under the same conditions will be. Convert the following measurement.2.0 x 10^4 g/mol x L = kg/mol x dL Write the equation of a line that is perpendicularto -y = -x and contains point (1,1) assume that the economy is in a mild recession, and as a result interest rates and money costs generally are relatively low. the wacc for two mutually exclusive projects that are being considered is 8%. project s has an irr of 20% while project l's irr is 15%. the projects have the same npv at the 8% current wacc. however, you believe that the economy is about to recover, and money costs and thus your wacc will also increase. you also think that the projects will not be funded until the wacc has increased, and their cash flows will not be affected by the change in economic conditions. under these conditions, which of the following statements is correct? Help me with this question You give tours on the Great Lakes and talk about points of interest. HELLPPWhich representation would show the organization of life from simplest to the most complex?Circulatory system, heart tissue, heart cellsHeart muscle cells, heart muscle tissue, heart, circulatory systemHeart muscle tissue, circulatory system, heart muscle cellsCirculatory system, heart muscle cells, heart muscle tissue AssignmentCompare Different ApproachesDescriptionYou have read and explored a number of stories in this unit. Youve met a budding chess champion from San Francisco, a down-on-his-luck husband during the Great Depression, and a young man facing bitter cold in the Yukon. Now its time to write about these stories. Of three texts youve read Rules of the Game, Gumption, and To Build a Fire choose two, and compare and contrast their literary elements. SpecificationsYour completed assignment should Address at least two of the following literary elements in the texts you choose: conflict, literary point of view, characters, and setting. Maintain an objective tone and employ a formal style throughout the response. Be at least two paragraphs long. (a) indicate which orbitals in the following list fill before the 4p orbitals. 3d 4s 4d 5s (b) what is the maximum number of electrons in the 4s subshell? (c) an electron in an orbital has the following quantum numbers: n As scientists have studied the evolution of BSE, they note that it is very similar to a disease that affects sheep. It has also been shown to be similar to a disease that affects rodents. Humans have been infected with a variation as well. What is the MOST reasonable conclusion that can be made from these studies? A. Every species is exposed to the disease in different ways. B. The disease can mutate and infect different species. C. Animals like cattle can be considered a dead end host. D. Scientists are confusing separate diseases as just one disease. what is they intercept of this quadratic function? f(x) = -x2 + 10x - 22