After adding 470.0 mL of an 8.8 times 10^-5 mM silver(II) oxide (AgO) solution to a reaction flask the chemist will get 5.1 μg of silver (II) oxide the chemist has added to the flask.
Step 1: Presented data
470.0 mL is the solution's volume (V) (0.4700 L)
Solution concentration (C): 8.8 105 mM (8.8 108 M).
Step 2: Determine the moles (n) of additional AgO.
The following expression will be used.
n = C × V
n = 8.8 108 mol/L 0.47 liters
n = 4.1 × 10⁻⁸ mol
Calculate the mass (m) equal to 4.1 10⁸ moles of AgO in step three.
AgO has a molar mass of 123.87 g/mol.
5.1 106 g = 4.1 10⁸ mol x 123.87 g/mol
Fourth step: Change "m" to micrograms
We'll take 1 g = 10⁶ g as our conversion factor.
5.1 × 10⁻⁶ g × 10⁶ μg/1 g = 5.1 μg
The complete question is:
A chemist adds 470.0 mL of an 8.8 times 10^-5 mM silver(II) oxide (AgO) solution to a reaction flask. Calculate the mass in micrograms of silver(II) oxide the chemist has added to the flask. Round your answer to 2 significant digits.
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A baseball player throws a ball with a force of 10N. The ball travels 20 meters? How much work was done?
Answer:
200Joules
Explanation:
W=Fd W=10×20 W=200J
Calculate the wavelength (in nm) of the orange light emitted by a neon sign with a frequency of 4.92 × 1014 Hz.
The energy of orange light emitted, per photon is 3.25 × 10-¹⁹ J
Given data in the question;
Frequency; f = 4.92× 10¹⁴ Hz
Energy of the orange light emitted; E = ?
Photon energy is energy carried by a single photon, which is represented by the expression:
E = hf
Where:
E = photon energy,
h = Planck's constants ( 6.626×10-³⁴ JHz-¹ )
f = frequency
substitute our values into equation
E= (6.626 × 10-³⁴ J / Hz) * (4.92× 10¹⁴ Hz
= 3.25 × 10-¹⁹ J
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The wavelength (in nm) of the orange light emitted by a neon sign with a frequency of 4.92 × 1014 Hz is 609.2 nm
What are frequencies and wavelengths?
The wavelength, which will also apply to troughs, is the separation between two wave crests. The frequency is measured in cycles per second (Hz), which is the quantity of vibrations that cross a specific area in a second (Hertz).
Each photon of orange light emits 3.25 10-19 J of energy.
the information in the query;
F = 4.92 1014 Hz is the frequency.
Energy of the released orange light: E =?
A single photon carries energy, and this is referred to as photon energy.
E = hf
Where: h = Planck's constants (6.62610-34 ),
E = photon energy
Substituting our values into the equation f = frequency
E= (6.626 × 10-³⁴ J / Hz) * (4.92× 10¹⁴ Hz)
= 3.25 × 10-¹⁹ J
E = hc/λ
6.626 × 10-³⁴ JHz-1 * 3.00 × 108 m/s/3.25 × 10-¹⁹ J
λ = 609.2 nm
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Balance the following redox reaction if it occurs in basic solution. What are the coefficients in front of br2 and oh- in the balanced reaction?.
The coefficients in front of br2 and oh- in the balanced reaction:
Br2 = 3, OH- = 6
There are indices that are part of the chemical formulas of the reactants and products. Also, there is a coefficient in front of the formula that indicates how many molecules of that substance are used or produced.
The number before the equation to balance the equation is called the factor which multiplies all the atoms in the equation. For example, the symbol 2NaHCO3 indicates two units of sodium bicarbonate containing 2 Na atoms 2 H atoms 2 C atoms, and 6 O atoms. Coefficients indicate how many numerators there are in a given expression.
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How would u know what kind of solvent is needed to clean a grease stain
Answer:
Trichloroethane is a solvent used to remove grease from clothes.
which scenario will most likely result in a change to the nitrogen cycle that negatively affects plant growth?
Soil acidification is a circumstance which will most likely lead to a change in the nutrient cycling that will have a detrimental impact on plant growth.
What is the main use of nitrogen?The chemical industry depends on nitrogen. It is used to create explosives, nylon, nitric acid, fertilizers, and colors. N must first be combined with hydrogen to create ammonia in order to create these products. The Haber process is used for this. Similar to chlorine gas and carbon monoxide poisoning, nitrous oxide poisoning is detrimental to all living things.
Why is nitrogen poisonous?Effects on health. The majority of greater nitrogen oxides are irritants to the eyes, skin, and respiratory system. Except at deadly quantities, where arginine may kill more quickly, no2 is a corrosive chemical that, when in contact with water, produces nitric and nitrous acids.
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how many protons, neutrons, and electrons, respectively, by the following symbol? 4822x
The number of protons, electrons, and neutrons in the element, ⁴⁸₂₂X is:
Number of protons = 22
Number of electrons = 22
Number of neutrons = 26
What are protons, electrons, and neutrons?Protons are the positively charged particles found within the nucleus of an atom. The number of protons in the nucleus of an atom gives the atomic number of that element.
Electrons are the negatively-charged particles found within electron shells or a[orbits around an atom.
Neutrons are the neutral particles found within the nucleus of an atom. The number of neutrons together with the protons gives the atomic mass of the atom.
The given element, ⁴⁸₂₂X has the following number of protons, electrons, and neutrons:
Number of protons = 22
Number of electrons = 22
Number of neutrons = 48 - 22
Number of neutrons = 26
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in double replacement reactions, why will two metals not combine with each other when products are formed?
When both products are soluble, a double replacement equation will not produce a reaction.
What causes certain double displacement reactions to be inert?We use the (s) symbol for solid because salt is an insoluble substance that will not dissolve in water. The silver, fluoride, potassium, and chloride ions would have effectively moved to a new location if there had been no precipitate formation, but they would still be floating around as ions. In this scenario no reaction happens.
What guidelines apply to responses involving double replacement?A double replacement reaction occurs when two ionic compounds swap ions to form two new ionic compounds. The following response is an example of this kind: AB + CD AD + CB.
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250 ml of nitrogen takes 30 sec and 300 ml of unknown gas takes 45 sec to diffuse through a porous membrane under similar condition. Determine the relative density of unknown gas.
250 ml of nitrogen diffuses through a porous membrane in 30 seconds while 300 ml of an unidentified gas does so in 45 seconds. For example, at the same temperature and pressure, methane diffuses in the same volume in 10 minutes while 240 ml of gas x diffuses through a porous membrane in 20 minutes.
What is porous membrane?
The gas's ethane partial pressure at the same total pressure. Compared to nitrogen, oxygen and carbon dioxide are both gases. the amount of time needed to carburete an iron-carbon alloy to reach a 0.45 weight percent carbon concentration at a place 2 mm away from its initial condition in 30 seconds. 100 mL of hydrogen diffuses in 5 seconds, while 100 mL of the unidentified gas does so in 20 seconds.
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Suppose you found a material in which 12. 5% of the original radioactive atoms were present. If the half-life is 47 years, how old is the material?
The response dates back 141 years. The formula (1/2)n = x can be used to compute it. x is the remaining fraction, There are n half-lives in total.
How do you determine a radioactive substance's half-life?The amount of time needed for the reactant concentration to drop to half its initial value is known as the half-life of a reaction. A first-order reaction's half-life is a constant that is correlated with its rate constant radioactive atoms: t1/2 = 0.693/k.
How many half life does it take for a radioactive substance, such as a 1 C 3 b2 D 4, to decay to 12.5 percent of its initial volume?The period of time it takes for half of the atoms in a given sample to experience radioactive, or nuclear, decay, is known as the half-life of a radioisotope.
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melt-away creamery combines sugar, cream, and the best natural flavorings, then churns and freezes the resulting mixture at a very low temperature, creating ice cream. the method melt-away uses is an example of
Melt-away creamery combines sugar, cream, and best natural flavorings, then churns and freezes resulting mixture at low temperature, creating ice cream. This method is an example of process manufacturing.
What do you understand by process manufacturing?A production method that creates goods by combining supplies, ingredients or raw materials using formula or recipe is called process manufacturing.
It is usually used in industries that produce bulk quantities of goods, like food, beverages, refined oil, gasoline, pharmaceuticals, chemicals and plastics. Process manufacturing is also known as a process industry and is defined as an industry, like the chemical or petrochemical industry, that is concerned with the processing of bulk resources into other products.
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The pH of a 0. 095 M solution of an unknown monoprotic acid is 5. 42. Calculate the Ka of the acid
Ka of Monoprotic Acid
Ka = [H+] [A-] / [HA]
What is a Monoprotic Acid?One proton or hydrogen atom per molecule is all that a monoprotic acid contributes to an aqueous solution. In contrast, polyprotic acids, which can donate more than one proton or hydrogen, can do so. Depending on how many protons they can contribute, polyprotic acids can be further divided into several types.
Given,
Ph = 5.42;
Conc of unknown MonoProtic Acid = 0.095M;
X= conc. of H+ = 3.8×10∧-6
Ka = x∧2 / 0.095 - x
We know the value of x, obtained from pH:
x = [H+] = 10∧-5.42 = 3.8 x 10∧-6
We solve for Ka
Ka = [3.8 x 10∧-6]2 / [0.095 - 3.8 x 10∧-6]
Ka = 1.5216 x 10∧-10
So, Ka of Monoprotic Acid
Ka = [H+] [A-] / [HA]
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deconstruct the given diels–alder adduct. draw the reactants, in any order, that would be needed to produce the diels–alder adduct.
Diels alder reaction is the reaction between diene and dienophile. Diene is electron rich and dienophile is elctron deficient species. In that diene involved 4 electron and dienophile involved 2 electron.
Diels-Alder reactions are usually catalyzed by Lewis acids. However, Diels-Alder reactions catalyzed by bases are unusual and only a few asymmetric, base-catalyzed reactions are known.
For example, the reaction of anthrone and N-methylmaleimide can be catalyzed by alkaloids However, only moderate ees were obtained.
These compounds can also be formed from the same type of cyclization process when the silyl group is attached to the 2 and/or 3 positions of a 1,3-diene.
The Diels–Alder reaction is a well-known and established reaction in organic chemistry consisting of a highly selective [4+2] cycloaddition of a diene to an alkene (dienophile) to yield cyclohexene derivatives.
This reaction provides an opportunity to surpass the limitations related to the coupling of chemically sensitive (bi ) molecules (as antibodies), especially in aqueous environments where both the rate and stereoselectivity of Diels–Alder reactions are significantly increased.
Here we do combination of reactant A and B ana get product back.
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why would methyl salicylate be much more volatile than salicylic acid? refer to the structures of the acid and ester to explain your reasoning.
The reason that methyl salicylate be much more volatile than salicylic acid is because:
Methyl salicylate (MeSA) is a volatile that has been demonstrated to help plants defend themselves from diseases and some herbivores, most notably aphids. It has been demonstrated to have the ability to manage the aphid pest, but little is known about its mode of action, particularly the induced plant-mediated effects.Salicylic acid is it flammable?Salicylic acid's COOH group is esterified with methanol in methyl salicylate (oil of wintergreen), whereas acetylsalicylic acid (aspirin) has acetic acid as the acid component of the ester and salicylic acid provides the phenolic OH group.
Note that Methyl salicylate, a volatile methyl ester of salicylic acid, can also diffuse into the atmosphere and aid in plant-plant communication.
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D
Question 1
Which of the following is NOT a tropism?
Ophototropism
Othigmotropism
Ogravitropism
Ohydrotropism
Onanotropism
Answer:
[A] Plant shoots are positively phototropic and negatively gravitropic. [B] Plant shoots are negatively phototropic and positively gravitropic. [C] Plant shoots are negatively hydrotropic and positively gravitropic. [D] Plant shoots do not display any major tropisms.
Answer:-Gravitropism. It is a type of tropism where plants show some growth in response to gravity. ...
Chemotropism. There are few chemical substances, which are actively responsible for bringing a curvature movement in plant organs. ...
Thigmotropism. ...
Hydrotropism. ...
Thermotropism. The below mentioned article will highlight the six types of tropic movements in plants.
The six types are: (1) Thigmotropism (Haptotropism) (2) Phototropism (3) Geotropism (4) Thermotropism (5) Chemotropism and (6) Hydrotropism. A tropism is a growth movement whose direction is determined by the direction from which the stimulus strikes the plant. There are two forms: Positive = the plant, or a part of it, grows in the direction from which the stimulus originates. and Negative = growth away from the stimulus. tropism is a biological phenomenon, indicating growth or turning movement of a biological organism, usually a plant, in response to an environmental stimulus. In tropisms, this response is dependent on the direction of the stimulus (as opposed to nastic movements which are non-directional responses).
when the concentration of a and b were 0.023 m and 0.054 m, the reaction rate was 8.31x10-2 m/sec, calculate the value for k (with units).
The reaction takes place in third order. The rate constant of the reaction for the given rate and concentrations is 1.23 × 10³ mol⁻² L² /s.
What is reaction rate?The rate of a reaction is the rate of increase in the concentration of products or rate of decrease in the concentration of the reactants.
For the given reaction, the rate law is written as:
rate = k[A][B]²
[A] = 0.023
[B] = 0.054
rate = 8.31 ×10⁻² M/s
Rate constant k = rate/[A] [B]²
K = 8.31 ×10⁻² M/s/(0.023 × 0.054²)
= 1.23 × 10³ mol⁻² L² /s
Therefore, the rate constant for the reaction is 1.23 × 10³ mol⁻² L² /s.
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Your question is incomplete. But your complete question probably was:
The rate of a reaction is, Rate = k[A][B]2.when the concentration of a and b were 0.023 m and 0.054 m, the reaction rate was 8.31x10-2 m/sec, calculate the value for k (with units).
Describe the unique properties of water and how they affect the following:
phase changes
physical properties
This is my answer. Is it ok? Do you have suggestions to make it better?
Unique properties of water are polarity, solvency, cohesion, adhesion, high boiling point, density and the ability to dissolve other substances. The three phases of water are solid (frozen), liquid and gas and are changed by temperature. Water molecules don't change between the phases, the molecules just interact differently to make the change.
Unique properties of water
Water molecules have a bent overall structure, partial positive charges on the hydrogens, partial negative charges on the oxygen, and are polar. This is due to the fact that oxygen is more electronegative than hydrogen, making it more effective at drawing electrons. Excellent solvents include water.
Temperature alters the three states of water, which are solid (frozen), liquid, and gas. Although the interactions of the water molecules change, the molecules themselves do not alter between the phases.
Water quality's physical characteristics
Color: Polluted water may be coloured; pure water is colourless.
Turbidity: Clear, light-unabsorbing water is the opposite of pure water.
Taste and odour: Pure water never has a taste or an odour.
How many distinct characteristics does water have?Given their polar nature, water molecules form hydrogen bonds. This gives water its distinctive properties, including polarity, solvency, cohesion, adhesion, high specific heat, and the capacity to act as a buffer. A solute that has dissolved in a solvent creates a homogeneous mixture known as a solution.
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How much heat, in joules, does it take to raise the temperature of 225. 0 g of water from 25. 0°c to 100. 0°c ?.
10.5 kJ is required to convert the temperature of water.
What is Temperature?
Temperature is a unit used to describe hotness or coldness. It can be stated in terms of any number of arbitrary scales and shows the direction in which heat energy will naturally flow, i.e., from a hotter body to a colder body (one at a lower temperature). Temperature is not the same as the energy of a thermodynamic system; for instance, an iceberg has a significantly larger total heat energy than a match.
As opposed to extensive characteristics, like mass or volume, temperature is referred to as an intense property—one that is independent of the quantity of matter being considered—along with pressure, density, and other comparable properties.
q=m⋅c⋅ΔT, where
q - heat absorbed
m- the mass of the sample
c- the specific heat of the substance
ΔT - the change in temperature, defined as final temperature minus initial temperature
q=100.0g⋅4.18Jg∘C⋅(50.0−25.0)∘C
q= 10.5 kJ
10.5 kJ is required to convert the temperature of water.
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two basketballs are sitting 1 m apart and are not moving which best explains why the gravitational force does not cause them to move
Newton's first law states that every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force.
what is the concentration of a solution prepared by mixing 5.00 ml of deionized water with 3.00 ml of a 1.31 m solution?
6.10 is the concentration of a solution prepared by mixing 5.00 ml of deionized water with 3.00 ml of a 1.31 m solution.
When combining solutions, how do you determine concentration?Add the mass of the solute to the total volume of the solution. Write down C = m/V, where m is the mass of the solute and V is the total volume of the solution.
How can you figure out how much of a solution dissolves in water?The amount of solute dispersed in one liter of solution, or its molarity (M), is measured in moles. To determine a solution's molarity, divide the number of moles of solute by the volume of the solution, measured in liters. To be clear, the volume is expressed in liters of solution rather than liters of solvent.
Mass total = mass of solute + mass of solvent
m = 5+3 = 8.00ml
C = m/V
C = 8 / 1.31 = 6.10
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How many grams of CO would be
required to generate 635 g CO2?
Fe2O3 + 3CO → 2Fe + 3CO2
CO: 28.01 g/mol
CO2: 44.01 g/mol
[?] g CO₂
3 moles or 84.03 g of CO produces 3 moles of or 132 g of CO₂. Thus, the mass of CO required to produce 635 g of CO₂ is 404.23 g.
What is carbon monoxide?Carbon monoxide is an inorganic gas produced from the covalent bonding of carbon with oxygen. When carbon monoxide reacts with metal oxides it produces carbon dioxide.
From the given balanced reaction, 3 moles of CO produces 3 moles of CO₂.
Molar mass of CO = 28.01 g/mol, 3 moles = (28.01 ×3) 84.03 g
molar mass of CO₂ = 44.01 g/mol , 3 moles = 132 g.
Thus, mass of CO required to produce 635 g of CO₂ is :
= (84.03 × 635 g) /132 g = 404.23 g.
Therefore, the mass of CO required to produce 635 g of CO₂ is 404.23 g.
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based on the molar mass of nacl (58.44 g/mol) and on the count of the ions inside the unit cell, what is the mass (in grams) of nacl is in a unit cell.
Therefore, 0.25 moles of unit cells will be present in 58.5 g.
How many atoms make up a mole of sodium chloride?Therefore, 6.0231023 6.023 10 23 molecules make up 1 mole of NaCl. The total number of atoms in 1 mole of NaCl N a C l is twice Avogadro's number, or 6.0231023 6.023 10 23 because each molecule of the salt has two atoms (Na and Cl).
How can you determine an ion's mass?Similar to covalent compounds, the formula mass of an ionic compound is determined by adding the average atomic masses of all the atoms in the compound's formula.
Calculation:1 mole of NaCl
Avogadro's number, or 6.0231023
0.25 moles of unit cells will be present in 58.5 g.
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you have a flask to which you add 0.025 m nh3, 0.25m n2 what is the value of the equilibrium constant
The value of the Equilibrium Constant is 1 when 0.025 m NH3, 0.25m N2 is added to the flask.
The value of a chemical reaction's reaction quotient at chemical equilibrium, a state that a dynamic chemical system reaches when enough time has passed and at which its composition has no observable tendency to change further, is the equilibrium constant for that reaction. As a result, the composition of a system at equilibrium can be calculated from its initial composition using known equilibrium constant values. The equilibrium constant's value, however, may be impacted by parameters affecting the reaction, such as temperature, solvent, and ionic strength.
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How many moles of O are in 132.03 g of CO2? (molar mass = 44.01 g/mol)?
There are 3.00 molecules of CO2 in 132.03 grams of CO2.
What is mass?Mass is quantitative measure of interia a fundamental quantity of all matter.
Mass of CO2 = 132.03 grams
Number of molecules of CO2 = ?
Molar mass of CO2 = ?
For the molar mass of CO2: Atomic mass of Carbon = 12; Oxygen = 16
= 12 + (16 x 2)
= 12 + 32 = 44g/mol
Apply the formula:
number of molecules = (mass in grams/molar mass)
N = (132.03 grams/44g/mol)
N = 3.00 molecules
Thus, there are 3.00 molecules of CO2 in 132.03 grams of CO2.
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Identify the Bronsted-Lowry acid (loses an H+ ion), base (gains an H+ ion) and the conjugate acid, and the conjugate base in each of the following.
a. HNO3 + H2O <---> H3O+ + NO3-
A B C.A. C.B.
b. NH3 + H2O <---> NH4+ + OH-
c. H2SO4 + OH-<---> HSO4- + H2O
d. C2H3O2– + H2O <---> OH- + HC2H3O2
e. H2PO4- OH-<---> HPO4-2 + H2O
f. H2PO4- + H3O+ <---> H3PO4 + H2O
g. HCO3– + H2O <---> H3O+ + CO3-2
h. HCO3– + H2O <---> H2CO3 + OH-
The Bronsted-Lowry acid, base and the conjugate acid-base in each of the following reactions are mentioned below serially:
Bronsted-Lowry acid Bronsted-Lowry base
HNO₃ H₂O
H₂O NH₃
H₂SO₄ OH⁻
H₂O C₂H₃O₂⁻
H₂PO₄⁻ OH⁻
H₃O⁺ H₂PO₄⁻
HCO₃⁻ H₂O
H₂O HCO₃⁻
Conjugate acid: Conjugate base:
H₃O⁺ NO₃⁻
NH₄⁺ OH⁻
H₂O HSO₄⁻
HC₂H₃O₂⁻ OH⁻
H₂O HPO₄²⁻
H₃PO₄ H₂O
H₃O⁺ CO₃²⁻
H₂CO₃ OH⁻
Define Bronsted-Lowry acid and base?Bronsted-Lowry acids are known to be substances those donate protons or H+ ions to other compounds to produce conjugate bases. Bronsted-Lowry bases are the substances that accept protons or H+ ions from other compounds to form conjugate acids.
For the given reactions:
a. HNO₃ + H₂O ⇔ H₃O⁺ + NO₃⁻
Bronsted-Lowry acid: HNO₃
Bronsted-Lowry base: H₂O
Conjugate acid: H₃O⁺
Conjugate base: NO₃⁻
b. NH₃ + H₂O ⇔ NH₄⁺ + OH⁻
Bronsted-Lowry acid: H₂O
Bronsted-Lowry base: NH₃
Conjugate acid: NH₄⁺
Conjugate base: OH⁻
c. H₂SO₄ + OH⁻ ⇔ HSO₄⁻ + H₂O
Bronsted-Lowry acid: H₂SO₄
Bronsted-Lowry base: OH⁻
Conjugate acid: H₂O
Conjugate base: HSO₄⁻
d. C₂H₃O₂⁻ + H₂O ⇔ OH⁻ + HC₂H₃O₂
Bronsted-Lowry acid: H₂O
Bronsted-Lowry base: C₂H₃O₂⁻
Conjugate acid: HC₂H₃O₂⁻
Conjugate base: OH⁻
e. H₂PO₄⁻ + OH⁻ ⇔ HPO₄²⁻ + H₂O
Bronsted-Lowry acid: H₂PO₄⁻
Bronsted-Lowry base: OH⁻
Conjugate acid: H₂O
Conjugate base: HPO₄²⁻
f. H₂PO₄⁻ + H₃O⁺ ⇔ H₃PO₄ + H₂O
Bronsted-Lowry acid: H₃O⁺
Bronsted-Lowry base: H₂PO₄⁻
Conjugate acid: H₃PO₄
Conjugate base: H₂O
g. HCO₃⁻ + H₂O ⇔ H₃O⁺ + CO₃²⁻
Bronsted-Lowry acid: HCO₃⁻
Bronsted-Lowry base: H₂O
Conjugate acid: H₃O⁺
Conjugate base: CO₃²⁻
h. HCO₃⁻ + H₂O ⇔ H₂CO₃ + OH⁻
Bronsted-Lowry acid: H₂O
Bronsted-Lowry base: HCO₃⁻
Conjugate acid: H₂CO₃
Conjugate base: OH⁻
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1. Use Models: How does the GPS determine its distance from each satellite?
an absoprtion spectrum shows an empty space where a green wavelength should be. how does this occur in the atom
The green wavelength is absorbed by the medium hence it does not appear.
What is the absorption spectrum?We know that absorption has to do with the process by which the atom is able to take in energy and this would lead to the upward movement of the electrons that are in the atom.
Thus the wavelengths that can be taken in by the atom as it is absorbing energy can be seen in the absorption spectrum. It is also possible to have gaps in the absorption spectrum due to absorption by the medium.
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. Calculate the frequency of a photon with an energy of 2.55 x 10-18 J
Answer:
The equation gives the frequency of a photon
f = E/h,
Where E is the photon's energy and h is Planck's constant (6.626 x 10-34 J s).
Substituting the values, we get:
f = 2.55 x 10-18 J / (6.626 x 10-34 J s)
= 3.85 x 1015 Hz
Explanation:
Pema want to do an activity with hydrochloric acid and lime water (bae). Mot acid and bae can damage human kin. Which tep mut he follow during the activity to enure afety?
When the hydrochloric acid react with the lime water then the product is formed by the reaction is calcium chloride.
The reaction of the hydrochloric acid with the reaction of the lime reaction is given as :
Ca(OH)₂ + HCl ----> CaCl₂ + H₂O
lime water hydrochloric calcium water
acid chloride
the safety taken during the reaction of acid and bases are :
wear the acid and bases resistant gloves , while handling the acid and base.wear the face shield, while working.wear the apron and the disposable gown, if you are working with the large amount the volume of acid and base.wash your hand properly.To learn more about hydrochloric acid here
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Scientists are studying fertilizers to help grass grow in southern California. Fertilizer is any substance that can be added to soil to help plants grow in it. In other words, fertilizer makes soil more fertile. The scientists set up different plots of land that all use the same type of soil and grass seed, but they use different types of fertilizer in each plot. Scientists then measure the grass growth in the different soils over time.
How should scientists set up the control group in this experiment?
a plot with grass seed but no fertilizer in the soil
a plot with grass seed and many types of fertilizer in the soil
a plot without any grass seed or any fertilizer in the soil
a plot without any grass seed but with fertilizer in the soil
Answer:
The corrrect answer will be option-A.
Explanation:
A scientific experiment contains two types of groups: the control and the experimental groups. The control group in any scientific experiment is the sample which does not receive the variable we need to test which is provided in the experimental groups.
In the given question, the scientist wanted to study the effect of fertilizers on the growth of the grass. so the parameter (variable) to be studied is fertilizer. The experimental samples are provided with different concentration of the fertilizer but the control sample will not receive the fertilizers as the control sample provides the base or reference to the experimental group to increase the accuracy of the results obtained.
Thus, option-A is the correct answer.
calculate the number of grams of aluminum required to prepare 299.0 g of chromium metal by the first reaction.
The mass of aluminum required to prepare 297.0g of chromium is 154.25 g.
The formation of chromium using aluminum powder is an exothermic process as heat is evolved in this process. In this type of reaction heat is released during the formation of product.
The balanced chemical reaction for the formation of chromium is given as,
Cr₂O₃(s) + 2Al(s) -> 2CrO(s) + Al₂O₃(s)
Thus, we can see that 2 moles of aluminum produces 2 moles of chromium.
Hence,
Molar mass of aluminum = 27g
∴ 2 moles of aluminum is required then mass of aluminum is 2 x 27 = 54g.
Molar mass of chromium = 54g
∴ 2 moles of chromium is obtained then mass of chromium is 2 x 54 = 104g.
Therefore, the amount of aluminum required,
mass of aluminum produced = 54 x 299/ 104
= 16146/104 = 155.25 g.
Therefore, the required amount of aluminum is 154.25 g.
Learn more about the formation of chromium from the link given below.
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