Chemistry Quarter 2 Quiz

A magnesium ion, Mg2+, has... a. 12 protons and 10 electrons. b. 12 protons and 14 electrons. c. 12 protons and 13 electrons. d. 24 protons and 26 electrons. e. 24 protons and 22 electrons.

a. 12 protons and 10 electrons.

What is the coefficient of H2SO4 when the following equation is properly balanced with the smallest set of whole numbers ___ Ca3(PO4)2 + ___ H2SO4 → ___ CaSO4 + ___ H3PO4 a. 3 b. 10 c. none of these d. 11 e. 8

a. 3

Boron obtained from borax deposits in Death Valley consists of two isotopes. They are boron-10 and boron-11 with atomic masses of 10.013 amu and 11.009 amu, respectively. The atomic mass of boron is 10.81 amu (see periodic table). Which isotope of boron is more abundant, boron-10 or boron-11? a. Boron-11 b. This cannot be determined from data given. c. Neither, their abundances are the same. d. Boron-10

a. Boron-11

Which of these choices is the formula for hydrobromic acid? a. HBr b. KBr c. HBrO3 d. HBrO2 e. HBrO

a. HBr

Identify the major ionic species present in an aqueous solution of Na2CO3. a. Na+, CO32- b. Na2+, CO32- c. Na+, C4+, O32- d. Na+, C+, O2- e. Na2+, C2-, O3

a. Na+, CO32-

Which one of these represents a physical change? a. lard, when heated, changes to a liquid b. bleach turns hair yellow c. sugar, if heated enough, turns black and loses its sweetness d. battery cables corrode e. milk turns sour

a. lard, when heated, changes to a liquid

The oxidation number of N in NaNO3 is a. +6. b. +5 c. +3. d. -3. e. non of these.

b. +5

A 20.00 mL sample of 0.1015 M nitric acid is introduced into a flask, and water is added until the volume of the solution reaches 250. mL. What is the concentration of nitric acid in the final solution? a. 5.08 ´ 10-4 M b. 8.12 ´ 10-3 M c. 1.27 M d. 0.406 M e. 3.25 ´ 10-2 M

b. 8.12 ´ 10-3 M

What are the products of the dissociation of Na2CO3. a. Na2+, C2-, O3 b. Na+, CO32- c. Na2+, CO32- d. Na+, C4+, O32

b. Na+, CO32-

Why does the air pressure inside the tires of a car increase when the car is driven? a. The atmosphere compresses the tire. b. The air particles inside the tire increase their speed because their temperature rises. c. Some of the air has leaked out. d. The air particles collide with the tire after the car is in motion.

b. The air particles inside the tire increase their speed because their temperature rises.

If the temperature of a fixed quantity and volume of gas changes, what also changes? a. formula b. pressure c. density d. mass

b. pressure

Pressure is the force per unit a. depth. b. surface area. c. length. d. volume.

b. surface area.

Standard pressure is exactly a. 101 atm. b. 760 atm. c. 1 atm. d. 101.325 atm.

c. 1 atm.

Based on the solubility rules, which one of these compounds should be soluble in water? a. AgCl b. Ag2S c. AgNO3 d. AgBr e. Ag2CO3

c. AgNO3

If the temperature remains constant, V and P represent the original volume and pressure, and V' and P' represent the new volume and pressure, what is the mathematical expression for Boyle's law? a. VV' = PP' b. mc006-1.jpg c. VP= V'P' d. P'V = V'P

c. VP= V'P'

If the pressure of a gas sample is quadrupled and the absolute temperature is doubled, by what factor does the volume of the sample change? a. 8 b. 1/4 c. 2 d. 1/2 e. 1/8

d. 1/2

Balance the following equation using the smallest set of whole numbers, then add together the coefficients. Don't forget to count coefficients of one. ___ Al + ___ H2SO4 → ___ Al2(SO4)3 + ___ H2 The sum of the coefficients is a. 6 b. 5 c. 3 d. 9 e. 12

d. 9

What element is oxidized in the chemical reaction 3Cu + 8HNO3 → 3Cu(NO3)2 + 2NO + 4H2O? a. H b. H2O c. N d. Cu e. O

d. Cu

Which is the correct formula for copper(II) phosphate? a. Cu2PO4 b. Cu3(PO3)2 c. Cu(PO4)2 d. Cu3(PO4)2 e. Cu2PO3

d. Cu3(PO4)2

Which of these compounds is a strong electrolyte? a. O2 b. C6H12O6 (glucose) c. CH3COOHÂ (acetic acid) d. H2SO4 e. H2O

d. H2SO4

When 22.0 g NaCl and 21.0 g H2SO4 are mixed and react according to the equation below, which is the limiting reagent? 2NaCl + H2SO4 → Na2SO4 + 2HCl a. Na2SO4 b. No reagent is limiting. c. HCl d. NaCl e. H2SO4

d. NaCl

Which instrument measures atmospheric pressure? a. vacuum pump b. torrometer c. manometer d. barometer

d. barometer

If force is held constant as surface area decreases, pressure a. increases or decreases, depending on the volume change. b. remains constant. c. decreases. d. increases.

d. increases.

One mole of iron a. is 77.0 g of iron. b. is 26.0 g of iron. c. is heavier than one mole of lead (Pb). d. is none of these. e. weighs the same as one mole of lead.

d. is none of these.

Determine the number of moles of aluminum in 96.7 g of Al. a. 6.02 x 1023 mol b. 7.43 mol c. 4.21 mol d. 0.279 mol e. 3.58 mol

e. 3.58 mol

Predict the products of the single replacement reaction Fe(s) + CuSO4(aq) → ? a. CuS(s) + Fe2SO4(aq) b. FeO(s) + CuSO3(aq) c. Fe(s) + Cu(s) + SO4(aq) d. FeCuSO4(aq) e. Cu(s) + FeSO4(aq)

e. Cu(s) + FeSO4(aq)

The elements in a column of the periodic table are known as a. metalloids b. a period. c. nonmetals d. noble gases. e. a group.

e. a group.

The distinguishing characteristic of all electrolyte solutions is that they a. always contain acids. b. conduct heat. c. react with other solutions. d. contain molecules. e. conduct electricity.

e. conduct electricity.