Convert
21 miles/hr to cm/s
Show two digits after decimal.

The volume of the balloon at 2.00 × 104m: 1.52x[tex]10^3[/tex] L

Given:

[tex]P_i[/tex]  = 1.0 [tex]atm[/tex]      -> absolute atmospheric pressure

[tex]P_f[/tex]  = 61.0 mm Hg -->  atmospheric pressure

    = (61.0/760) [tex]atm[/tex]

    = 0.0802 [tex]atm[/tex]

[tex]V_i[/tex] = 171 L

[tex]T_i[/tex] = 20.0 [tex]^oC[/tex]

 = (20.0+273) K

 = 293 K

[tex]T_f[/tex] = 210.0 K

[tex]\frac{P_i \times V_i}{T_i} = \frac{P_f \times V_f}{T_f}[/tex]

(1 [tex]atm[/tex] * 171 L) / (293.0 K) = (0.0802 [tex]atm[/tex] * [tex]v_f[/tex])/(210.0 K)

[tex]V_f[/tex] = 1.52x[tex]10^3[/tex] L

The air around you has weight and it weighs down everything it touches. This pressure is called atmospheric pressure or atmospheric pressure. This is the force that the air above it exerts on the surface when gravity pulls it toward the ground. Air pressure is usually measured with a barometer.

Examples of air pressure, when you press an onion, there is  air  in the tube and the onion comes out as bubbles. However, there is air pressure on the surface of the liquid. When we release the bulb,  water moves inside the tube.

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Answer: 4.076L

Explanation:  The formular for Molarity is moles/Volume

So 0.280M = 0.0687 mol/Volume

Divide both sides by the moles

0.280M/0.0687mol = _______ liters

4.0756  = 4.076 Liters

The changes that I would make in my experimental procedure to  determine the rate law for the oxidation of the red dye by sodium hypochlorite is that the wavelength at which the dye concentration is calculated would be changed as a result of the operation.

Since there would be an alteration in the wavelength at which the dye concentration, You shouldn't measure at the wavelength where the blue dye absorbs since you would no longer be attempting to detect the rate of oxidation of the blue dye.

Most likely, the red dye absorbs more light at a different, lower wavelength. Decide on the best wavelength to use to measure the red dye concentration, then switch to that wavelength to evaluate the kinetics.

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The second image that is shown below accurately identifies displacement and additive plating.

The term plating is actually an electrochemical process. This implies that it has to do with a chemical reaction that involves electrochemistry. The term plating has to do with the situation where a metal is wholly or partially covered by another metal in a electrochemical process. Recall that electrons must be transferred as part of the process as it is an electrochemical process.

In the process of an additive plating, has to do with a situation where a metal is merely added to the surface of another metal without replacing the metal. In fact, the surface does have the two metals.

In the case of the displacement plating, the metal that was initially on the surface is replaced and then we have a whole new metal that is present on the surface as shown in the image in the question.

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The chemical formula for the ionic compound formed by Hg₂²⁺ and CO₃²⁻ is Hg₂²⁺  + CO₃²⁻  ⇄ HgCO₃

A chemical formula can be defined as the expression that states the number and type of atoms present in a molecule of a substance.

When a cation and anion combine to form a compound, there will be transfer of electron form one ion to another creating ionic bond in molecule formed.

The chemical formula for the ionic compound formed by Hg₂²⁺ and CO₃²⁻ is determined as follows;

Hg₂²⁺  + CO₃²⁻  ⇄ HgCO₃

Thus, the chemical formula for the ionic formed by the ions will have have electron transfer from one ion to another.

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The properties of an alloy are similar to the properties of its components. The elements in an alloy are not combined in fixed proportions is an alloy not considered a compound

Although the physical characteristics of the alloy are intermediate to those of its component metals, the chemical characteristics of each element are unaltered. Physical methods can be used to separate an alloy (separated by melting). A compound is a collection of several components that are connected by chemical connections.

Metal mixes or blends of a metal and another element are known as alloys. A combination of metallic phases or a solid solution of metal elements, known as an alloy, are both possible (a heterogeneous mixture of two or more solutions).

An alloy is a combined, homogenous combination of a metal with other metals or non-metals.

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Answer: Answer is B and C

b: the properties of an alloy are similar to the properties of its components.

c: The elements in an alloy are not combined in fixed propo

Explanation:

Answer:

Al2S3

Explanation:

Both are ionic, so to find out which one has the higher melting point, remember that opposite forces attract, and the stronger the opposite forces are, the stronger they attract.
BeCl2 is made of Be 2+ and Cl (1)-, while Al2S3 is made of Al 3+ and S2-
Since 3 and 2 multiply to a larger number than 2 and 1, the attractive forces between a 3+ ion and a 2- ion are stronger than that of a 2+ ion and a 1- ion. The stronger the forces between atoms, the higher the melting point is.

The mass of the sample in grams is 115.53 × [tex]10^{-3}[/tex].

The weight of an atom has been its atomic mass. Although the kilogram is the standard international measurement of mass, the unified atomic mass unit, or Dalton, is frequently used to express atomic mass. One Da is equal to one-twelfth of the mass of a free carbon-12 atom in its ground state.

The quantity of material that makes up an element's atom, its atomic mass. It is stated as a multiple of 1.992646547 1023 gram, which is equal to one-twelfth of the mass of the carbon-12 atom, which has an atomic mass of 12 units. An element's atomic unit (amu), on the this measure, is equivalent to 1.660539040 1024 grams. The Dalton (Da) is yet another term again for atomic mass unit which commemorates the English chemist John Dalton.

Silver has an atomic mass of 107.87 g/mol.

There are 6.022 × [tex]10^{23}[/tex] atoms in one mole of anything.

You have 6874 × [tex]10^{20}[/tex] atoms of Ag.

So:

6.45 x [tex]10^{20}[/tex] atoms × 1 mol/(6.022 x [tex]10^{23}[/tex]) atoms × 107.87 grams Ag/mol

=    115.53 × [tex]10^{-3}[/tex]grams

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The energy of the electron is obtained as -0.85 eV.

From the Bohr model of the atom, we know that the electrons that can be found in the shells of hydrogen do have a specific energy level where they could be found. As such the reason being the spectrum of the hydrogen atom is the movement of an electron from one energy level to another.

We can be able to obtain the energy of each of the orbits of the hydrogen atom by the use of;

E = -13.6/n^2

Where n is the principal quantum number.

E =  -13.6/(4)^2

E = -0.85 eV

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The amount, in grams, of calcium hydroxide that would be required for the complete reaction with 23.1 g sulfuric acid will be 17.44 grams.

In order to solve this problem, we first need to get the balanced equation of the reaction:

[tex]H_2SO_4 + Ca(OH)_2 -- > CaSO_4 + 2H_2O[/tex]

For a complete reaction, the mole ratio of the sulfuric acid to calcium hydroxide is 1:1.

Recall that: mole = mass/molar mass

Molar mass of sulfuric acid = 98 g/mol

Mole of 23.1 grams sulfuric acid = 23.1/98

                                             = 0.2357 moles

This means the mole of calcium hydroxide required will also be 0.2357 moles.

Now, let's find the equivalent mass of the calcium hydroxide.

Mass = mole x molar mass

Molar mass of calcium hydroxide = 74 g/mol

Mass of 0.2357 calcium hydroxide = 0.2357 x 74

                                                      = 17.44 grams

Thus, the mass of calcium hydroxide that would be needed for a complete reaction is 17.44 grams.

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Converting 6.2 GL/s to m^3/hr we get 84.94 m^3/hr , as an one Gallon per second is equals to 13.627 cubic meters per hour.

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Answer: CH40 ( the 4 is not a whole number )

Explanation: If we assume that we have a sample of 100g of the compound, then that would mean we have 37.47 grams (3.12 moles) of carbon, 12.61 grams (12.48 moles) of hydrogen, and 49.92 grams (3.12 moles) of oxygen. The molar ratio of C:H:O is 3:12:3, reducing to 1:4:1, giving the empirical formula of CH4O.

Answer:

d valance electrons

Explanation:

Valence electrons are outer shell electrons with an atom and can participate in the formation of chemical bonds. In single covalent bonds, typically both atoms in the bond contribute one valence electron in order to form a shared pair.

hope this helps

Answer:

Aniline reacts with bromine water to give a white precipitate.

Answer:

Average atomic mass: 132.85a. m. u.

Explanation:

The average atomic mass could be found by:

Average mass = ∑ (Abundance percentage × isotope mass)

⇒ Average mass = (0.75 × 133) + (0.20 × 132) + (0.05 × 134) = 132.85a. m. u.

Hope this helps! :)

To find the net ionic equation we must first write the balanced equation for the reaction. We must bear in mind that the reagents Ca(NO3)2 and Na2S are in the aqueous state and as product we will have CaS in the solid state, since it is not soluble in water and NaNO3 in the aqueous state.

The balanced equation of the reaction will be:

Ca(NO3)2(aq) + → Ca(aq) + 2Na(s)NO3Now, c(aq)ompounds in the aqueous state can be written in their ionic form, so the reaction will transform into:Na2S +

So, the answer will be option A

The number of moles of oxygen produced is 0.065 mol.

The molarity of a chemical compound is largely decided in chemistry by trying to divide the mass of a sample of that compound by the amount of substance of that compound, which corresponds to the number of moles in that specimen, evaluated in moles. A substance's molar mass is a bulk property rather than a molecular one. A substance's molar mass is its mass in grams per mole of the compound. A mole is the measurement of the quantity of atoms, molecules, or ions in a substance. A mole is 6.022 1023 molecules of any given substance.

The total mass of all the atoms in a molecule expressed in grams per mole is known as the molar mass.

The mass of the oxygen gas produced = 2.1 g

The molar mass of oxygen gas  , [tex]O_{2}[/tex] = 2 × 16 g/mol

= 32 g/mol

The formula for the calculation of moles

= mass taken /  molar mass

Thus,

Moles = 2.1 / 32

= 0.065 mol

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a)  Fe does not fit in the Colum 7, Because Fe shows different in chemical Properties. its valance electron configuration  is different from oxygen and sulfur.

b) The gaps that Mendeleev left in his table were one of its distinctive features. He not only predicted the existence of yet-undiscovered elements in these locations, but also their atomic weights and other properties.

c) The modern periodic  table is the arrangement of elements in increasing order of their atomic numbers.

d) Lithium ,potassium  and Sodium have electronic configuration end with S1. since  they are in group 1.

The current periodic law serves as the foundation for the periodic table's lengthy form. The elements are organized in the table in ascending order of their atomic numbers. The periodic chart as it exists now is known as the contemporary periodic table. 18 vertical columns and 7 horizontal rows make up the structure.

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Answer:

Explanation:

yt maybe

The net ionic equation for the precipitation of calcium phosphate from aqueous solution is  Ca²+ (aq)+ S²- (aq)=>CaS(s)-----> CaS(s).

For a precipitation reaction, the net ionic equation is written by first knowing the precipitate, then use the solubility rules (if there are any).

Then one can write down the precipitate's formula that was made to the right of an arrow. The ions that react to get the precipitate as the reactants to the left of the arrow should have their formulas written down also:

Hence:

Since the molecular fomular is: H2S(aq) + CaCl2(aq) -------> CaS(s) + 2HCl(aq)

Then the full ionic equation will be: 2H^+(aq) + S²-(aq) + Ca²+(aq) + 2Cl^-(aq) -------> CaS(s) + 2H^+(aq) + 2Cl^-(aq)

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852 grams of chromium carbonate needs to be measured out to produce 3 moles of chromium carbonate.

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If you are on 4.16 Chemical Reactions and have 18 questions, then go to the following on Quizlet for further help. Thanks and good luck!

Quizlet - "4.6 Chemical Reactions UT"

h t t p s : / / q u i z l e t . c o m / _ c 7 3 1 u j ? x = 1 q q t & i = 3 8 n a a s

All the given chemical reactions are considered to be chemical change as they are accompanied  by change in state and even evolution of gases.

Chemical changes are defined as changes which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical change.

There are several characteristics of chemical changes like change in color, change in state , change in odor and change in composition . During chemical change there is also formation of precipitate an insoluble mass of substance or even evolution of gases.

There are three types of chemical changes:

1) inorganic changes

2)organic changes

3) biochemical changes

During chemical changes atoms are rearranged and changes are accompanied by an energy change as new substances are formed.

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Answer:
0.022

Explanation:

The first number is:
0.0204, and has 4 sig figs (bolded numbers are sig fig contributors)
The second number is:
0.002 and has 3 sig figs

The answer we get must have the same number of sig gifs as the lowest sig fig count of the given values. In this case, the answer would have 3 sig figs and not 4 because the smaller one is 3.
Do the calculations and then round.

0.0204 + 0.002 = 0.0224, and since we only want 3 sig figs, go from the right of the period and count 3 numbers, which would be 0.0224, and notice how the 4 isn't included. This means that the final answer should be 0.022

The mass of the nitrogen in solution of N₂O₂, n = 4.55 g.

To calculate the mass of nitrogen using formula,

n = W / w

where,

n is mass of nitrogen

W is molecular weight of N₂O₂

w is weight of solution

So, given data are :

w = 13.2 g

W = 60.013 g

n = ?

Now, putting the values we get,

n = 60.013 / 13.2

n = 4.55 g

Hence, the mass of the nitrogen in solution of N₂O₂, n = 4.55 g.

The inorganic substance dinitrogen dioxide has the chemical formula N₂O₂. It is conceivable to have many structural isomers. Based on ab initio calculations, the covalent bonding pattern O=N-N=O is projected to be the most stable isomer and is the only one that has been created experimentally.

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A snow globe is a suspension combination because it shakes up with snow all over it, which eventually settles.

Glycerin, a transparent liquid that is often manufactured from vegetable oils, is one of the secrets to making a snow globe. It is used frequently to reduce the impact of glitter and agitated water on the appearance of snowfall. Your snow globes risk drying out, cracking, and color fading if the right precautions aren't taken to protect them. In general, you should store your snow globes away from hot surroundings, bright sunlight, and other risky places where they could break.

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Answer:

[A-] : [HA] = 1000 : 1

Explanation:

I'm assuming that you mean a pKa of 5 not a pa of 5
For this question, the equation:
pH = pKa + log([A-]/[HA])
plug in pH and pKa
8 = 5 + log([A-]/[HA])
move the 5 from the right to the left
3=log([A-]/[HA])
raise 10 to both sides of the equation to get rid of the log
10^3=10^(log([A-]/[HA]))
1000=[A-]/[HA]
so the ratio of [A-] to [HA] is 1000 to 1

The liquid filtrate that you collect after filtering your solid product will be acidic no its not acidic its basic

Filtration is a technique used either to remove solid impurities from an organic solution or to isolate an organic solid and the two types of filtration commonly used in organic chemistry laboratories are gravity filtration and vacuum or suction filtration

Filtration is the process in which solid particles in a liquid or gaseous fluid are removed by the use of a filter medium that permits the fluid to pass through but retains the solid particles and either the clarified fluid or the solid particles removed from the fluid may be the desired product and when we filtrate the liquid part then precipitation is stick means solid part is stick to the filter paper and other liquid part is filtered and this ppt is not the acidic its a basic part

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Solutions:

• Hot air rises because as the air is heated, it enlarges or swell up, resulting in reduced density, hence it rises .

• The molecules in the hot air also heats up and move faster and spreads out and hits the inside of the baloon pushing it upwards since the its density is lesser than when it was cooled.