Chemistry chapter 7

24) Which of the following correctly gives the correct coefficients for the reaction below? N2H4 + H2O2 -N2 + H2O A) 1, 2, 1, 1 • B) 1, 2, 1, 4 C) 2, 4, 2, 8 D) 1, 4, 1, 4 E) 2, 4, 2, 4

• B) 1, 2, 1, 4

42) How many grams of CO2 are produced from 125 g of O2 and excess CH4? CH4 + 202 → CO2 + 2H2O A) 125 g B) 62.5 g C) 172 g D) 85.9 g E) 250. g

A) 125 g

18) 3.00 moles of NO2 have a mass of A) 138 g B) 46.0 g C) 30.0 g D) 90.0 g E) 45.0 g

A) 138 g

42) How many grams of NO are required to produce 145 g of N2 in the following reaction? 4NH3 + 6NO 5N2 + 6H20 A) 186 g B) 155 g C) 125 g D) 129 g E) 145 g

A) 186 g

5) One mole of copper(II) sulfate, CuSO4, contains moles of O. A) 4 B) 6.02 x 1023 C) 1.51 x 1023 D) 2.41 x 1023 E) 2.41 x 1024

A) 4

12) The molar mass of C3H8O2 is A) 76.09 g/mole B) 60.09 g/mole C) 29.02 g/mole D) 69.02 g/mole E) 52.01 g/mole

A) 76.09 g/mole

19) How many grams of Fe203 are there in 0.500 mole of Fe2O3? A) 79.9 g B) 35.9 g C) 63.8 g D) 51.9 g E) 160. g

A) 79.9 g

10) What is the molar mass of sodium phosphate, A) 69.96 g/mole B) 118.0 g/mole C) 163.9 g/mole D) 226.1 g/mole E) 354.0 g/mole

C) 163.9 g/mole /

20) How many grams of K2SO4 are there in 0.123 mole of K2SO4? A) 14.7 g B) 16.6 g C) 21.4 g D) 42.8 g E) 76.3 g

C) 21.4 g

25) What is the coefficient of hydrogen, H2, when the following equation is balanced? Al + H2SO4 + Al2(SO4) 3 +? H2 A) 1 B) 2 C) 3 D) 4 E) 5

C) 3

41) Find the mass of AICI3 that is produced when 25.0 grams of Al203 reacts with HCl according to the following equation. Al203 + 6HCI → 2AIC13 + 3H20 A) 155 g B) 72.9 g C) 65.3 g D) 32.6 g E) 16.3 g

C) 65.3 g

13) The molar mass of calcium hydroxide, Ca(OH)2, is A) 58.09 g/mole B) 57.09 g/mole C) 74.10 g/mole D) 114.2 g/mole E) 54.02 g/mole

C) 74.10 g/mole

38) When 4 moles of aluminum are allowed to react with an excess of chlorine gas, C2, how many moles of aluminum chloride are produced? 2A1 + 3C12 - 2Ala3 A) 1 mole B) 2 moles C) 3 moles D) 4 moles E) 5 moles

D) 4 moles

1) One mole of particles of any substance contains how many particles? A) 106 particles B) 3 x 10-10 particles C) 3 x 1010 particles D) 6.02 x 1023 particles E) 6.02 x 10-23 particles

D) 6.02 x 1023 particles

31) The following reaction takes place when an electric current is passed through water. It is an example of a reaction. 2H20 electricity 2H2 +02 A) combination B) single replacement C) combustion D) decomposition E) double replacement

D) decomposition

36) In an oxidation-reduction reaction, the substance reduced always A) takes on oxygen atoms B) loses electrons C) gives up hydrogen atoms D) gains electrons E) becomes a charged species

D) gains electrons charged

28) What is the classification for this unbalanced reaction? Fe + HCl FeCl3 + H2 A) combustion B) combination C) decomposition D) single replacement E) double replacement

D) single replacement

34) What is oxidized and what is reduced in the following reaction? 2A1 + 3B12 2AIB13 A) Al is oxidized and Br2 is reduced. B) AIB33 is reduced and Brz is oxidized. C) Al is reduced and Br2 is oxidized. D) AIB33 is reduced and Al is oxidized. E) AIBr3 is oxidized and Al is reduced.

A) Al is oxidized and Br2 is reduced.

47) Any reaction that absorbs 150 kcal of energy can be classified as A) endothermic B) exothermic C) activated D) reduction E) oxidation

A) endothermic

2) Avogadro's number is the number of A) particles in 1 mole of a substance B) amu in 1 mole of a substance C) grams in 1 mole of a substance D) moles in 6.02 x 1023 g of an element E) moles in 6.02 x 1023 amu of an element

A) particles in 1 mole of a substance

7) How many moles of carbon atoms are there in 0.500 mole of C2H6? io-algiloM A) 0.500 mole B) 1.00 mole v C) 3.00 moles D) 6.02 x 1023 moles E) 4.00 moles

B) 1.00 mole

26) In this reaction, what is the correct coefficient for sodium chloride? Pb(NO3)2 + ? NaCI - PbCl2 + ? NANO3 A) 1 B) 2 C) 3 D) 4 E) 5

B) 2

15) How many moles of water, H2O, are present in 75.0 g H20? A) 4.41 moles B) 4.16 moles C) 75.0 moles D) 7.50 moles E) 1.35 x 103 moles

B) 4.16 moles

43) The is the minimum energy needed for a chemical reaction to begin. A) reaction energy B) activation energy C) energy of reactants D) energy of products E) heat of reaction.

B) activation energy

45) What type of reaction is: CH4 + 202 CO2 + 2H2O + 218 kcal? A) an endothermic reaction B) an exothermic reaction C) a single replacement reaction D) a combination reaction E) a decomposition reaction

B) an exothermic reaction

32) What is the classification for this reaction? SO3 + H20 → H2SO4 A) decomposition B) combination C) replacement D) double replacement E) combustion

B) combination

44) A reaction that releases energy as it occurs is classified as a(n) A) endothermic reaction B) exothermic reaction C) oxidation-reduction reaction D) catalyzed reaction E) decomposition reaction

B) exothermic reaction

46) If the reaction shown below is exothermic, the energy level of the reactants is H2 + 02 - 2H2O A) lower than that of the products B) higher than that of the products C) the same as that of the products D) possibly lower, possibly higher than that of the products E) higher than the activation energy of the reaction

B) higher than that of the products

35) In an oxidation-reduction reaction, the substance oxidized always A) takes on oxygen atoms B) loses electrons C) gives up hydrogen atoms D) gains electrons E) becomes a charged species

B) loses electrons

22) In any balanced chemical equation, the number of each type of atom on both sides of the equation is A) doubled B) the same C) decreased by one D) increased by one E) dependent on the temperature

B) the same

39) How many grams of hydrogen are needed to produce 1.80 g of water according to this equation? 2H2 + O2 → 2H20 A) 0.101 g B) 0.180 g C) 0.201 g D) 2.01 g E) 4.02 g

C) 0.201 g

40) In the reaction of silver nitrate with sodium chloride, how many grams of silver chloride will be produced from 100. g of silver nitrate when it is mixed with an excess of sodium chloride? The equation for the reaction is below. AGNO3 + NaCl → AgCl + NaNO3 A) 107.9 g B) 169.9 g C) 84.4 g D) 0.589 g E) 58.9 g

C) 84.4 g

33) The reaction of carbon with oxygen to produce carbon monoxide is an example of which class of reaction? 2C + O2- 2CO A) single replacement B) double replacement C) combination D) catalytic E) endothermic

C) combination

combination 30) The following reaction is an example of a reaction. C5H8 + 702 - 5CO2 +4H20 A) combination B) single replacement C) combustion D) decomposition E) double replacement

C) combustion

27) For the following reaction, what is the correct coefficient for the H2? Fe + HCl - FEC13 + H2 A) 1 B) 2 C) 3 D) 4 E) 5

C)3

17) How many moles of K2SO4 are in 15.0 g of A) 0.172 moles B) 2.61 x 103 moles C) 0.111 moles D) 0.0861 moles E) 0.119 moles

D) 0.0861 moles

16) 0.100 mole of lithium has a mass of A) 3.00 g B) 0.300 g C) 6.94 g D) 0.694 g E) 0.700 g

D) 0.694 g

9) What is the molar mass of copper(II) sulfate, CuSO4? A) 16.00 g/mole B) 63.60 g/mole C) 111.6 g/mole D) 159.6 g/mole E) 319.2 g/mole

D) 159.6 g/mole

4) 0.400 mole of sucrose, C12H22011, contains C atoms. A) 12 B) 6.02 x 1023 C) 5.02 x 1022 D) 2.89 x 1024 / E) 4.80

D) 2.89 x 1024

11) One mole of neon atoms has a mass of A) 6.02 x 1023 g B) 14.01 g C) 10.01 g D) 20.18 g E) .99 g

D) 20.18 g

23) Which of the following gives the balanced equation for this reaction? K3PO4 + Ca(NO3)2 Ca3(PO4)2+ KNO3 A) KPO4 + CaNO3 + KNO3 B) K3PO4 + Ca(NO3)2 Ca3(PO4)2 + 3KNO3 C) 2 K3PO4 + Ca(NO3)2 - Ca3(PO4)2 + 6KNO3 D) 2K3PO4 + 3Ca(NO3)2 Ca3(PO4)2+ 6KNO3 E) K3PO4 + Ca(NO3)2 Ca3(PO4)2+ KNO3

D) 2K3PO4 + 3Ca(NO3)2 Ca3(PO4)2+ 6KNO3

8) The molar mass of potassium is A) 19.00 g/mole B) 31.00 g/mole C) 6.02 x 1023 g/mole D) 39.10 g/mole E) 15.02 g/mole

D) 39.10 g/mole

21) A chemical equation is balanced when A) the total number of molecules is the same in reactants and products B) the total number of ions is the same in reactants and products C) the sum of the coefficients of the reactants is equal to the sum of the coefficients of the products D) the number of atoms of each element is the same in reactants and products E) the charge on each atom is the same in reactants and products

D) the number of atoms of each element is the same in reactants and products

37) Given the following equation, what is the correct form of the conversion factor needed to convert the number of moles ofo to the number of moles of Fez03 produced? 4Fe + 302- 2FE2O3 4 moles Fe A)4 moles Fe ————————- 3 moles O2 B) 4 moles Fe ————————— 2 moles Fe2O3 C) 3 moles O2 ————————— 2 moles Fe2O3 D) 2 moles Fe2O3 ———————————- 4 moles Fe E) 2 moles Fe2O3 ———————————- 3 moles O2

E) 2 moles Fe2O3 ———————————- 3 moles O2

3) One mole of copper(II) sulfate, CuSO4, contains O atoms. A) 4 B) 6.02 x 1023 C) 1.51 x 1023 D) 2.41 x 1023 E) 2.41 x 1024

E) 2.41 x 1024

14) What is the molar mass of Mg3(PO4)2, a substance formerly used in medicine as an antacid? A) 71.28 g/mole B) 118.3 g/mole C) 150.3 g/mole D) 214.3 g/mole E) 262.9 g/mole.

E) 262.9 g/mole.

6) 0.400 mole of sucrose, C12H22011, contains moles of C. A) 12 B) 6.02 x 1023 C) 5.02 x 1022 D) 2.89 x 1024 E) 4.80

E) 4.80

29) In a reaction, two or more elements or compounds form one product. A) decomposition B) single replacement C) combustion D) double replacement E) combination

E) combination

48) The is the energy difference between reactants and products in a chemical reaction. A) transition energy B) activation energy C) product energy D) overall energy E) heat of reaction

E) heat of reaction

.14) In the following reaction C is reduced. 2C + O2- 2CO

F

1) Avogadro's number is the number of grams in a mole.

F

12) The following is a double replacement reaction. 2C2H2 + 502 - 4CO2 + 2H2O

F

16) In the following reaction, 20.0 g of Al will react completely with 30.0 g of Br2. 2Al + 3B12 - 2AIB33

F

18) The following reaction is endothermic. 2C2H2 + 502 - 4CO2 + 2H20 +310 kcal

F

2) The molar mass of silver is 47 g/mole.

F

8) The mass of 1.57 moles of calcium nitrate is 25.8 g.

F

9) The following reaction is correctly balanced. KCI03 - KCI + 02

F

The molar mass of chlorine gas is 35.45 g/mole.

F

10) The following reaction is correctly balanced. 2C2H2 + 502 - 4CO2 + 2H2O

T

11) The following is a decomposition reaction. 2KC103 - 2KCI + 302

T

13) In the following reaction Al is oxidized. 2Al + 3B12 + 2AIB33

T

15) In the reaction of hydrogen gas with oxygen gas to produce water, 1 mole of oxygen gas can produce 2 moles of water, given sufficient hydrogen available.

T

17) In the following reaction, when 100. g of Br2 reacts, 111 g of AIB33 is formed. 2Al + 3B12 → 2AIB33

T

3) The molar mass of magnesium is 24.31 g/mole.

T

4) The molar mass of water is 18.02 g.

T

6) The molar mass of copper(II) chloride is 134.5 g/mole.

T

7) The mass of 0.352 mole of sodium chloride is 20.6 g

T