Chemistry Final Exam Review 2021

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Choose the correct name for the compound HClO _3 ..

- Chloric acid

What would be the pH of a solution of a 0.015 M of HCI ?

1.80 ( not on test)

" An acid is a substance that forms hydrogen ions (H^ + ) when dissolved in water . " This is an example of

; an Arrhenius definition

____represents quantitatively the reactants and products in a chemical reaction

A balance Chemical equation

What is the percent of hydrogen in methane , CH 4 ?

Answer , 25.1

Methane (CH 4 ) in water

Answer , insoluble

The mole ratio of the elements in a compound's molecular formula is

Answer , multiple of the mole ratio of the elements in its empirical formula.

What is the molar mass of Al_2O_3

Answer 102 g/mol

What is the molar mass of MgSO 4

Answer 120.37 amu

A sample of 0.0255 mol potassium hydroxide , KOH , was dissolved in water to yield 10.0 mL of solution . What is the molarity of the solution ?

Answer 2.55 M

what are conditions that describe Standard Temperature and Pressure (STP)

Answer 22.4L , OK: 274•C , 1 atm

What would be the pH of solution that has an [H^ + ]concentration of 1 x 10 ^ - 4 l

Answer 4.0

What is the mass of one mole of helium gas ?

Answer 4g ;

What is the new pressure of 150 mL of a gas that is compressed to 50 when the original pressure was 3.0 atm and the temperature is held constant ?

Answer 9.0 atm

In the reaction 2 H 2 +O 2->2 H 2 O how many moles of oxygen are required to fully react with 6.0 mol of hydrogen ?

Answer : 12.0 mol

Which compound has the smallest molar mass?

Answer : ; H2O

A student observes what happens when two different aqueous solutions are mixed in a test tube. Which of the following observations would be most indicative of precipitation reaction?

Answer : a solid settles out

A solution that contains the maximum amount of solubMakete that is soluble at a given temperature is said to be

Answer : saturated ;

Which Coefficients correctly balance the equation below ? CH _4 +O_2 CO_2 +H_2 O

Answer :1,2,1,2

The average kinetic energy of the particles in a sample of matter is measured as the

Answer :; temperature

How many Joules of heat are required to raise 65 grams of water from a temperature of 35 degrees * C to a temperature of 57 degrees * C ? The specific heat of water is 4.18 J/g*^ C

Answer ; 5977.4 J

Which of the following would result in being able to dissolve a greater amount of gas in a solution ?

Answer ; Decrease the pressure of the solution

Which of the following variables are NOT needed to calculate heat ?

Answer ; Time

. If the temperature of a gas changes, but the number of moles and volume remain constant , which of the following values must also change?

Answer Pressure

. Any substance that does not conduct electricity when in solution is called a(n)

Answer electrolyte

Which of the following physical properties does NOT describe an acid ?

Answer feels slippery

What causes surface tension in water ?

Answer hydrogen bonding

When preparing a solution, the substance that is to be dissolved is called

Answer the solute

What coefficients are needed to correctly balance the equation shown ? Mg + HCl -> MgCl_2 + H_2.

Answer, 1211

Nitrogen reacts with hydrogen to form ammonia What is the mole ratio between nitrogen and hydrogen N 2 +H 2 —> NH 3

Answer, 1:3

Calculate the approximate volume of a 1.50 mol sample of gas at 15 ° and a pressure of 3.75 atm (R = 0.0821Latm / mol K)

Answer, 9.46L

Water Boils at ____ degrees CELSIUS

Answer,100

How many grams of NaCl are present in 11.00 moles?

Answer:, 642.8g

How many Mg 2+ ions are present in 3.00 moles of MgCl 2

Answer; 1.81 x 10 ^24

The number of valence electrons in Group 2 elements is

Answer; 2

What process takes place when the average energy of a gas's particles decreases ?

Answer; condensation

. A student wants to identify a 4.78 g unknown metal sample She applies 3.00 Joules of heat to the sample and measures a temperature change from 24.94°C to 28.86 degrees * C Based on the information and the table shown, what is the most likely identity of the metal?

Answer; lead

Stoichiometry is...

Answer;The relationships among the quantities of reactants and products involved in chemical reactions.

During and endothermic reaction , heat content in the surroundings decreases because

Answers; The reaction absorbs heat energy

Which of the following describes the process of sublimation ?

DH 2 O(g) —>H 2 O(s)

Which must be present for a piece of iron to rust

Oxygen

Which of the following is not one of the postulates of the kinetic molecular theory for ideal gases ?

The particles attract and then repel each other .

Water can dissolve many substances because it has

a partial charge on each side of its molecules

Strong acids are those that

dissociate completely , answer , : lose their protons more easily


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