Chem 122 Final

The prefix "hepta" means six. a. True b. False

b. False

How many significant figures are in the number 0.0015070? a. 5 b. 4 c. 7 d. 8

a. 5

A copper(II) ion forms when a copper atom a. gains one electron. b. gains two electrons. c. loses one electron. d. loses two electrons.

d. loses two electrons.

Gamma rays have a. a mass of 4 amu. b. a charge of +2. c. a charge of -1. d. neither mass nor charge.

d. neither mass nor charge.

A bond that is principally ionic will form between a. sulfur and hydrogen. b. phosphorus and sulfur. c. chlorine and iodine. d. potassium and fluorine.

d. potassium and fluorine.

Brønsted and Lowry defined a base as a(n) a. electron donor. b. electron acceptor. c. proton donor. d. proton acceptor.

d. proton acceptor.

Why study chemistry? a. to help inform us about our world b. to be better able to make informed decisions c. to help us learn a technique for identifying and solving problems d. all of these choices

d. all of these choices

Which of the following is a nonpolar molecule? a. H2S b. CO2 c. HF d. NH3

b. CO2

How many significant digits are in the number 1.30 × 104? a. 1 b. 2 c. 3 d. 4

c. 3

The nucleus of an atom usually contains ___. a. protons b. neutrons c. protons and neutrons d. neither protons nor neutrons

c. protons and neutrons

In the following reaction, CH3NH2 + H2O --> CH3NH3+ + OH- the compound CH3NH2 behaves as: a. an acid b. a base c. a salt d. a conjugate acid

a base

What is the relative electrical charge of an electron? a. -1 b. +1 c. -2 d. 0

a. -1

How many moles are present in 1.64 g of MgSO4? a. 0.0136 mol b. 120. mol c. 1.64 mol d. 0.734 mol

a. 0.0136 mol

What is the molarity of the resulting solution when 300. mL of a 0.600 M aqueous solution is diluted by the addition of 400. mL of water? Assume volumes are additive. a. 0.257 M b. 0.450 M c. 0.800 M d. 1.40 M

a. 0.257 M

400.0 g of a metal absorbs 10000. J of heat energy and its temperature rises from 20.0 ºC to 103.0 ºC. What is the specific heat of the metal? a. 0.301 J/gºC b. 0.255 J/gºC c. 3.32 J/g ºC d. 0.243 J/gºC

a. 0.301 J/gºC

What is the molarity of a solution in which 1.20 mol of solute is dissolved in 3.00 L of solution? a. 0.400 M b. 15.0 M c. 3.60 M d. 360. M

a. 0.400 M

How many moles are present in 140. g of CaCl2? a. 1.26 mol b. 15500 mol c. 0.793 mol d. 1.46 mol

a. 1.26 mol

The reaction of glucose, C6H12O6, with oxygen produces carbon dioxide and water. What is the sum of the coefficients in the balanced equation? a. 19 b. 17 c. 12 d. 6

a. 19

How many O atoms are present in 1.04 mol of MgSO4? a. 2.51 x 10^24 atoms b. 4.16 x 10^23 atoms c. 1.04 x 10^23 atoms d. 6.26 x 10^23 atoms

a. 2.51 1024 atoms

A mole of gas at 0.0oC and 760. torr occupies 22.4 L. What is the volume of this gas at 25.oC and 760. torr? a. 24.5 L b. 0.0 L c. 20.5 L d. 19.8 L

a. 24.5 L

How many kilojoules of energy are required to bring 800.0 g water from 20.00C to the boiling point? a. 268 kJ b. 2.68 × 108 kJ c. 3.35 × 105kJ d. 3.35 × 108kJ

a. 268 kJ

How many joules of energy are released when 100.0 g of water cools from 98.0 ºC to 20.0 ºC? a. 32600 J b. 32800 J c. 167 J d. 7800 J

a. 32600 J

What is the mass of 1.80 mol of Al(NO3)3? a. 383 g b. 257 g c. 272 g d. 161 g

a. 383 g

A hot air balloon is filled to a volume of 44.5 L at 758 torr. What will be the volume of the balloon if the pressure decreases to 748 torr under constant temperature? a. 45.1 L b. 43.9 L c. 44.5 L d. 49.0 L

a. 45.1 L

Which of the following is a nonpolar molecule? a. CH4 b. KCl c. HCl d. H2O

a. CH4

Which of the following is the formula for dinitrogen monoxide? a. N2O b. NO2 c. NO d. N2O4

a. N2O

Freezing point depression, boiling point elevation, and osmotic pressure are all colligative properties. a. True b. False

a. True

The hydronium ion is responsible for the properties of a. acids. b. bases. c. salts.

a. acids.

Which type of radiation is deflected towards the negative side of an electromagnetic field? a. alpha b. beta c. gamma

a. alpha

The following reaction: C + O2 → CO2, is an example of a. combination. b. decomposition. c. single-displacement. d. double-displacement.

a. combination.

The following reaction: H2 + I2 → 2HI, is an example of a. combination. b. decomposition. c. single-displacement. d. double-displacement.

a. combination.

In an acidic solution the a. concentration of hydronium ion is greater than that of hydroxide ion. b. concentration of hydroxide ion greater than that of hydronium ion. c. concentration of hydronium ion and hydroxide ion are equal.

a. concentration of hydronium ion is greater than that of hydroxide ion.

As the difference in electronegativity between two atoms increases, the polarity of a bond between those two atoms a. increases. b. decreases. c. remains the same.

a. increases.

Which type of chemical bond involves the transfer of electrons? a. ionic b. polar covalent c. nonpolar covalent

a. ionic

The electrical charge of a nucleus is ___. a. positive b. negative c. the nucleus has no charge, it is neutral

a. positive

Which particle contributes the most to the electrical charge of the nucleus? a. proton b. neutron c. electron

a. proton

The statement, "An atom consists of a dense nucleus surrounded by a cloud of electrons", is best described as a(n) ___. a. theory b. law c. hypothesis d. observation

a. theory

What is the relative electrical charge of a proton? a. -1 b. +1 c. -2 d. 0

b. +1

How many moles of iron(III) oxide are required to completely react with 1.40 x 1022 atoms of carbon in the following reaction? Fe2O3 + 3C --> 2Fe + 3CO a. 0.0232 mol b. 0.00775 mol c. You Answered 4.67 × 1021 mol d. 0.0697 mol

b. 0.00775 mol

What is the molarity of the resulting solution when 300. mL of a 0.400 M solution is diluted to 800. mL? a. 0.109 M b. 0.150 M c. 1.07 M d. 1.47 M

b. 0.150 M

How many moles of silver ions are present in 32.46 g of AgNO3? a. 5520 mol b. 0.191 mol c. 32.5 mol d. 5.23 mol

b. 0.191 mol

250.0 g of a metal releases 5000. J of energy and its temperature drops from 90.0 ºC to 15.7 ºC. What is the specific heat of the metal? a. 3.72 J/gºC b. 0.269 J/gºC c. 0.222 J/gºC d. 1.27 J/g ºC

b. 0.269 J/gºC

What is the mass of 0.360 mol of HCl? a. 101 g b. 13.1 g c. 2.17 1023 g d. 0.360 g

b. 13.1 g

What mass of sodium hydroxide will neutralize completely 3.612 mol of HCl? a. 0.09030 g b. 144.5 g c. 11.07 g d. 3.612 g

b. 144.5 g

A 4.00 L sample of a gas is at a pressure of 2.00 atm. If the temperature remains constant, what will be its volume at 0.500 atm of pressure? a. 1.00 L b. 16.0 L c. 0.250 L d. 4.00 L

b. 16.0 L

How many joules of energy are required to raise the temperature of 150.0 g of water from 15.0 ºC to 45.0 ºC? a. 4500 J b. 18800 J c. 25400 J d. 6590 J

b. 18800 J

How many significant figures are in the number 0.0032? a. 1 b. 2 c. 3 d. 4

b. 2

How many significant figures are in the number 0.0050? a. 1 b. 2 c. 3 d. 4

b. 2

A sample of gas has a volume of 200. mL at 20.0°C. What will be its volume at 40.0°C, pressure remaining constant? a. 18.8 mL b. 214 mL c. 100. mL d. 400. mL

b. 214 mL

A sample of gas has a volume of 3.40 L at 10.0°C. What will be its volume at 100.0°C, pressure remaining constant? a. 0.340 L b. 4.48 L c. 34.0 L d. 2.58 L

b. 4.48 L

Given the unbalanced equation: H2O2 → H2O + O2. When properly balanced, the sum of the balancing coefficients is a. 4. b. 5. c. 6. d. 7.

b. 5.

A 3.00 L sample of a gas at a pressure of 4.00 atm is compressed to 2.00 L at a constant temperature. What is the pressure of the gas? a. 2.00 atm b. 6.00 atm c. 12.0 atm d. 24.0 atm

b. 6.00 atm

A well-established hypothesis is often called a(n) ___. a. observation b. fact c. Correct Answer theory d. law

b. Answer theory

Which is a scientific observation? a. Freezing and boiling are called physical changes. b. Water freezes at 0°C. c. If a substance has a density of 1.00g/mL it must be water. d. When a substance freezes its molecules lose potential energy.

b. Water freezes at 0°C.

An alpha particle has a. a mass of 2 amu. b. a mass of 4 amu. c. a charge of -1. d. neither mass nor charge.

b. a mass of 4 amu.

The hydroxide ion is responsible for the properties of a. acids. b. bases. c. salts.

b. bases.

In a basic solution the a. concentration of hydronium ion is greater than that of hydroxide ion. b. concentration of hydroxide ion is greater than that of hydronium ion. c. concentration of hydronium ion and hydroxide ion are equal.

b. concentration of hydroxide ion is greater than that of hydronium ion.

As the distance between two particles with charges that attract one another increases, the force of attraction will ___. a. increase b. decrease c. remain the same

b. decrease

Which liquid is miscible with water? a. carbon tetrachloride b. ethyl alcohol c. bromine d. oil

b. ethyl alcohol

Which of the following processes absorbs energy? a. condensation of water on a wind shield of a car b. formation of copper (II) oxide from copper and oxygen c. ball rolling down a hill d. formation of ice from liquid water

b. formation of copper (II) oxide from copper and oxygen

A polar covalent bond will form between which two atoms as shown in the following combinations? a. beryllium and fluorine b. hydrogen and chlorine c. sodium and oxygen d. fluorine and fluorine

b. hydrogen and chlorine

Arrhenius defined base as a substance whose aqueous solution contains an excess of a. sodium ion. b. hydroxide ion. c. chloride ion. d. hydrogen ion.

b. hydroxide ion.

A tentative explanation of certain facts that provides the basis for further experimentation is a(n) ___. a. observation b. hypothesis c. theory d. law

b. hypothesis

In any period, the highest electronegativity is found in a a. metal. b. nonmetal. c. metalloid.

b. nonmetal.

Particles with which electric charges will attract one another? a. positive and positive b. positive and negative c. negative and negative d. both positive and positive and positive and negative

b. positive and negative

A hydrogen ion consists of a(n) a. electron. b. proton. c. neutron. d. proton and electron.

b. proton.

Halogens generally form ions with a charge of a. +1. b. +2. c. -1. d. -2.

c. -1.

What is the charge associated with a neutron? a. +1 b. -1 c. 0 d. none of these choices

c. 0

What is the molarity of the resulting solution when 400. mL of a 0.400 M solution is diluted to 800. mL? a. 1.20 M b. 0.800 M c. 0.200 M d. 0.133 M

c. 0.200 M

How many total atoms are present in 1.00 mol of Al2(SO4)3? a. 6.02 × 10^23 atoms b. 9.03 × 10^24 atoms c. 1.02 × 10^25 atoms d. 1.20 × 10^24 atoms

c. 1.02 × 1025 atoms

The density of a solid is 1.36 g/mL. The specific gravity of the substance is ___. a. 1.00 b. 1.40 c. 1.36 d. cannot be determined

c. 1.36

The number, 14.74999, when rounded to three digits is ___. a. 15.0 b. 14.8 c. 14.7 d. 10.0

c. 14.7

How many grams of sodium iodide are required to react completely with 3.01 × 1023 molecules of chlorine? 2NaI + Cl2 --> I2 + 2NACL a. 37.5 g b. 1.50 g c. 150. g d. 74.9 g

c. 150. g

How many grams of water will be required to completely react with 1.00 mol of CaO according to the following reaction? a. 0.0555 g b. 5.55 g c. 18.0 g d. 1.00 g

c. 18.0 g

A 400.0 g sample of water is at 30.0 ºC. How many joules of energy are required to raise the temperature of the water to 45.0 ºC? a. 628 J b. 1880 J c. 25100 J d. 450 J

c. 25100 J

What mass of sodium chloride will be required to completely react with 4.00 × 1024 formula units of AgNO3 and form AgCl and sodium nitrate? a. 8.80 g b. 6.64 g c. 388 g d. 0.114 g

c. 388 g

How many total atoms are present in 0.140 g of HCl? a. 4.57 x 10^22 atoms b. 1.20 x 10^24 atoms c. 4.62 x 10^21 atoms d. 2.31 x 10^21 atoms

c. 4.62 x 10^21 atoms

What is the mass of 3.61 mol of CaCl2? a. 21.7 g b. 3.61 g c. 401 g d. 21.7 1023 g

c. 401 g

Which is not part of Dalton's atomic model? a. Elements are composed of minute, indivisible particles called atoms. b. Atoms of the same element are alike in mass. c. Atoms of the same element can be different in size. d. Chemical compounds are composed of two or more atoms of different elements.

c. Atoms of the same element can be different in size.

Who discovered radioactivity? a. Curie b. Roentgen c. Becquerel d. Geiger

c. Becquerel

What is the formula of calcium nitrate? a. Ca3N2 b. Ca(NO2)3 c. Ca(NO3)2 d. Ca(NO2)2

c. Ca(NO3)2

Which phase change releases energy? a. H2O (l) H2O (g) b. H2O (s) H2O (l) c. H2O (l) H2O (s) d. H2O (s) H2O (g)

c. H2O (l) H2O (s)

What is the formula of magnesium sulfate? a. MgS b. MgSO3 c. MgSO4 d. MgSO

c. MgSO4

Which is an observation? a. Atoms consist of protons, neutrons, and electrons. b. All matter is composed of atoms. c. Water is colorless. d. Atoms can form chemical bonds by sharing electrons.

c. Water is colorless.

A beta particle has a. a mass of 4 amu. b. a charge of +4. c. a charge of -1. d. neither mass nor charge.

c. a charge of -1.

A Lewis electron dot symbol shows a. all the electrons in the ground-state of an atom. b. all the core electrons in the ground-state of an atom. c. all the valence electrons in the ground-state of an atom. d. all the electrons in the outermost sublevel in an atom.

c. all the valence electrons in the ground-state of an atom.

Which one of the following is an incorrect representation of the indicated particle or nucleus? a. neutron 1/0 n b. alpha particle 4/2 He c. beta particle -1/ 0 e d. proton 1/1 p

c. beta particle -1/ 0 e

CO is called a. mono carbon monoxide b. carbon oxide c. carbon monoxide d. carbon (I) monoxide

c. carbon monoxide

Which subatomic particle contributes least to the mass of an atom? a. proton b. neutron c. electron

c. electron

Which subatomic particle is not found in the nucleus of the atom? a. proton b. neutron c. electron

c. electron

What subatomic particles contribute to the charge of the atom? a. proton and neutron b. neutron and electron c. electron and proton d. proton, electron, and neutron

c. electron and proton

A potassium atom is converted to a potassium ion when the atom a. gains one electron. b. gains two electrons. c. loses one electron. d. loses two electrons.

c. loses one electron.

Which type of chemical bond involves the equal sharing of electrons? a. ionic b. polar covalent c. nonpolar covalent

c. nonpolar covalent

The pH of a solution can be calculated from which of the following expressions? a. pH = -log [OH-] b. pH = log [OH-] c. pH = -log [H +] d. pH = log [H +]

c. pH = -log [H +]

Brønsted and Lowry defined an acid as a(n) a. electron donor. b. electron acceptor. c. proton donor. d. proton acceptor.

c. proton donor.

The mass of an atom is primarily determined by the mass of its ___. a. protons b. neutrons c. protons and neutrons d. neither protons nor neutrons

c. protons and neutrons

The following reaction: Ca + 2H2O → Ca(OH)2 + H2, is an example of a. combination. b. decomposition. c. single-displacement. d. double-displacement.

c. single-displacement.

The following reaction: F2 + 2KBr→ 2KF + Br2, is an example of a. combination. b. decomposition. c. single-displacement. d. double-displacement.

c. single-displacement.

The following reaction: K + NaBr → KBr + Na, is an example of a. combination. b. decomposition. c. single-displacement. d. double-displacement.

c. single-displacement.

The following reaction: Mg + FeO → MgO + Fe, is an example of a. combination. b. decomposition. c. single-displacement. d. double-displacement.

c. single-displacement.

The electrical charge of an atom is ___. a. positive b. negative c. the atom has no charge, it is neutral

c. the atom has no charge, it is neutral

A nucleon is a. the sum of all the subatomic particles in an atom. b. all of the protons in the nucleus. c. the protons and neutrons in the nucleus. d. all of the neutrons in the nucleus.

c. the protons and neutrons in the nucleus.

Elements of Group 6A generally form ions with a charge of a. +1. b. +2. c. -1. d. -2.

d. -2.

Elements of Group VA generally form ions with a charge of a. +5. b. +3. c. -2. d. -3.

d. -3.

How many moles are present in a sample of HCl with a mass of 3.65 g? a. 3.46 mol b. 2.19 x 10^24 mol c. 10.0 mol d. 0.100 mol

d. 0.100 mol

One kilometer is equal to ___. a. 0.001 m b. 0.01 m c. 100 m d. 1000 m

d. 1000 m

Given the unbalanced equation: C2H2 + O2 → CO2 + H2O. When properly balanced, the sum of the balancing coefficients is a. 10. b. 11. c. 12. d. 13.

d. 13.

How many kilojoules of energy are released when .1.60 kg of water cools from 80.0 ºC to 60.0 ºC? a. 32.0 kJ b. 382 kJ c. 515 kJ d. 134 kJ

d. 134 kJ

How many joules of energy are released when 45.0 g of water cools from 18.0 ºC to 7.0 ºC? a. 495 J b. 791 J c. 2860 J d. 2070 J

d. 2070 J

How many significant figures are in the number 1.500? a. 1 b. 2 c. 3 d. 4

d. 4

How many significant figures are in the number 14.04? a. 1 b. 2 c. 3 d. 4

d. 4

A sample of gas has a volume of 8.00 L at 20.0°C and 700. torr. What will be its volume at STP? a. 1.20 L b. 9.32 L c. 53.2 L d. 6.87 L

d. 6.87 L

Given the unbalanced equation: Al + CuSO4 → Al2(SO4)3 + Cu. When properly balanced, the sum of the balancing coefficients is a. 6. b. 7. c. 8. d. 9.

d. 9.

One instrument used to measure ionizing radiation is a a. radioactive counter. b. Curie counter. c. Roentgen counter. d. Geiger counter.

d. Geiger counter.

The science of chemistry may involve: a. observation b. Hypothesis development c. experimentation d. all of these choices

d. all of these choices

Particles with which electrical charges will repel one another? a. positive and positive b. positive and negative c. negative and negative d. both positive and positive and negative and negative

d. both positive and positive and negative and negative

A nonpolar covalent bond will form between which two atoms as shown in the following combinations? a. potassium and chlorine b. hydrogen and chlorine c. sodium and bromine d. chlorine and chlorine

d. chlorine and chlorine

Arrhenius defined an acid as a substance whose aqueous solution contains an excess of a. sodium ion. b. hydroxide ion. c. chloride ion. d. hydrogen ion.

d. hydrogen ion.

An explanation that accounts for a set of facts is best known as ___. a. experiment b. law c. theory d. hypothesis

d. hypothesis

The statement, "An apple a day keeps the doctor away", is best described as a(n) ___. a. observation b. law c. theory d. hypothesis

d. hypothesis

Which of the following is the SI prefix that means 1000? a. milli b. centi c. deci d. kilo

d. kilo

The curie, which is the unit used to express the amount of radioactivity produced by an element, is based on the amount of disintegrations per second undergone by 1 g of a. pure uranium. b. pure hydrogen. c. pure helium. d. pure radium.

d. pure radium.

As the temperature of a solid radioisotope increases, the mode of decay a. changes from alpha to beta. b. changes from beta to alpha. c. changes from either alpha or beta to gamma. d. remains the same.

d. remains the same.

Which of the following is a "pure" substance? a. tap water b. Coca Cola® c. seawater d. water

d. water