Chapters 10, 11, & 12

The heat of fusion for water is 334 J/g, and the specific heat of water is 4.148 Jcal/g °c. How many joules of heat are released when 20.0 g of water at 30. °C is cooled to 0.0 °C and frozen to ice at 0.0 °C?

-9200 kJ

What is the molarity of the solution obtained when 0.100 mol of copper sulfate are dissolved in 0.200 liters of solution?

0.500 M

How many moles of neon occupy a volume of 14.3 L at STP?

0.638 moles

When 35 mL of 0.92 M H2SO4reacts with excess Al, how many L of H2 are formed at 23 °C and a pressure of 745 mmHg? 2Al (s) + 3 H2SO4 (aq) → Al2(SO4)3 (aq) + 3 H2 (g)

0.80 L

When 35 mL of 0.92 M H2SO4reacts with excess Al, how many L of H2 are formed at 23 °C and a pressure of 745 mmHg? 2Al (s) + 3 H2SO4 (aq) → Al2(SO4)3 (aq) + 3 H2 (g)

0.80 L

What is the density of carbon dioxide at STP?

1.96g/L

What is the mass percent (m/m) concentration of a solution of 10.0 g of sodium chloride in 100. g of solution?

10.0%

How many grams of sodium chloride are required to make 2.00 L of a solution with a concentration of 0.100 M?

11.7 g

The temperature of a 500. mL sample of gas increases from 150. K to 350. K. What is the final volume of the sample of gas, if the pressure in the container is kept constant?

1170 mL

When 25.0 g of NaCl is added to 175 g of water, the mass percent (m/m) NaCl is ________.

12.5%

If the heat of fusion for water is 334 J/g, how many kilojoules are lost when 45.0 g of water at 0.0 °C is converted to ice at 0.0 °C?

15.0 kJ

If the heat of fusion for water is 334 joules/g, how many kilojoules are needed to melt 45.0 g of ice at 0 °C?

15.0 kJ

What is the mass percent (m/m) concentration of a solution prepared from 500. g NaCl and 2.50 kg of water?

16.7%

How many covalent bonds will an oxygen atom normally make?

2

The number of electron lone pairs in the water molecule is ________.

2

What is the molarity of a solution which contains 58.4 g of sodium chloride dissolved in 500. mL of solution?

2.00 M

What is the molarity of a solution containing 5.00 moles of KCl in 2.00 L of solution?

2.50 M

A sample of argon at 300. °C and 50.0 atm pressure is cooled in the same container to a temperature of 0 °C. What is the new pressure?

23.8 atm

At STP, temperature and pressure have the values of

273 K and 760 mmHg.

How many covalent bonds will a nitrogen atom normally make?

3

The heat of fusion for water is 334 J/g, and the heat of vaporization of water is 2260 J/g. How many joules are required to convert 10.0 g of ice at 0.00 °C to steam at 100. °C? The specific heat of water is 4.184 J/g °c.

30100 J

How many kilojoules are required to warm 15.0 g of water from 75.0 °C to 100.0 °C and convert it to steam at 100.0 °C? The heat of vaporization of water is 2260 J/g, and the specific heat of water is 4.184 J/g °c.

35.5 kJ

A gas sample in a closed, expandable container of initial volume 5.00 L was allowed to warm from 25 °C to 35 °C. What was its new volume?

5.17 L

How many kilojoules are required to convert 115.0 g of ice at 0.0 °C to liquid water at 32.0 °C? The heat of fusion of water is 334 J/g, and the heat capacity of water is 4.184 J/g °c.

53.8 kJ

How many grams of glucose are needed to prepare 400. g of a 2.00% (m/m) glucose solution?

8.00 g

Which of the following is the correct electron-dot structure for C2F4?

A

When the nonelectrolyte glucose is dissolved in water, the solution contains ________.

All glucose molecules

The building blocks of proteins are

Amino acids

According to the kinetic molecular theory of gases, particles of a gas

Are very far apart

Which of the following compounds contains an ionic bond?

CaO

The ability of an atom to attract the shared electrons in a covalent bond is its ________.

Electronegativity

During inspiration, we actually make use of 100% of the oxygen in the air we breathe.

False

If water is added to 20. mL of a 6.0% (m/v) HCl solution until the volume is 40. mL, the new concentration is 12% (m/v).

False

Sodium acetate is a weak electrolyte.

False

The carbon dioxide molecule contains a triple covalent bond.

False

The dipole in the nitrogen-hydrogen bond points

From the hydrogen to the nitrogen

Ionic bonding is expected in which of these compounds?

KF

What unit of temperature is used in gas law calculations?

Kelvin

Which of the following elements has the lowest electronegativity?

Li

Of the five elements Na, Al, S, Cl, F, the least electronegative is ________.

Na

Which one of the following compounds will be soluble in water?

NaOH

When the combined gas law is rearranged to solve for V2, the following is the correct expression: V2 =

P1V1T2 / P2T1

The mathematical expression of the ideal gas law is ________.

PV = nRT

Identify as polar or nonpolar: water

Polar

When two or more equivalent dot structures can be written for a given molecule it is said to have ________ structures.

Resonance

Which of the following does NOT represent a step on the heating curve of water?

The temperature of steam cannot exceed 100 °c.

Which of the following statements is NOT true about water?

The water molecule is linear.

Which of the following is NOT part of the kinetic molecular theory of gases?

There is very little empty space in a gas

Ammonia is a non-polar molecule.

True

As a solid melts, its temperature does not change.

True

At 0 K, all motion stops.

True

Hydrochloric acid is a strong electrolyte.

True

In deoxygenated blood, the partial pressure of carbon dioxide is greater than the partial pressure of oxygen left.

True

The higher the pressure of a gas above a liquid in a closed container, the greater the solubility of the gas.

True

The kinetic energy of a gas sample is directly proportional to the Kelvin temperature of the gas.

True

The oxygen-hydrogen bond is a polar covalent bond.

True

The total number of valence electrons in the fluorine molecule, F2, is 14.

True

The volume of 1 mole of any gas at STP is 22.4 L.

True

Gout is due to the deposition of crystals of ________ in the joints.

Uric acid

A molecule contains a central atom with two identical bonds to other atoms and two lone pairs. The shape of this molecule is ________.

bent

The shape of a molecule of water, H2O, is ________.

bent

Complete the following statement: In Charles' law, the volume of a gas ________ when the ________ decreases.

decreases, temperature

Oxygen, O2, is held together by a triple ionic bond.

false

Which of the following is NOT a potential use for a hyperbaric chamber?

increasing the rate at which a broken bone heals

The air pressure on a rainy day is usually ________ air pressure on a sunny day.

lower than

Oil does not dissolve in water because

oil is nonpolar

The O-H bond in water is polar because

oxygen is much more electronegative than hydrogen.

In the kinetic molecular theory of gas behavior, particles of a gas tend to move ________ and collisions between them are ________.

rapidly, elastic

Ozone, O3, is an example of a molecule that has ________ structures.

resonance

The diatomic molecule Cl2 is held together by a ________ covalent bond.

single

Ammonium chloride, NH4Cl, is ________ in water.

soluble

The carbon tetrachloride molecule, CCI4, has the shape of a ________.

tetrahedron

The VSEPR theory allows us to determine the ________.

the shape of the molecule

A burn from steam at 100 °C is expected to be more severe than a burn from boiling water at 100 °C because

the steam will give off a large amount of heat as is condenses

A burn from steam at 100 °C is expected to be more severe than a burn from boiling water at 100 °C because

the steam will give off a large amount of heat as it condenses.

The most electronegative element is fluorine.

true