Chem 1010 CH 9

For an ionic compound, X2Y5, if the charge on each Y ion is −2, the charge on each X ion is: −2 −5 −10 +10 +5

+5

Assume air has an average molar mass of 28 grams/mole, and determine how many moles of air molecules there are 1.0 liters of air, which contains 1.26 grams of air molecules. 28 moles 0.45 mole 0.045 mole 22.4 moles

0.045 mole

Using the old English measurements of volume listed, determine the number of gallons in two gills. 1 gill = 1 noggin 1 butt = 2 hogsheads 1 kilderkin = 2 firkins 1 firkin = 9 gallons 1 hogshead = 52.458 gallons 1 peck = 64 noggins 1 peck = 2 gallons 0.0039 gallons 64 gallons 0.0625 gallons 512 gallons 2304 gallons

0.0625 gallons

How many moles of carbon are atoms are in 1.574 g of novocain, C13H21N2O2Cl? 0.01008 moles 0.005776 moles 0.07510 moles 0.12096 moles 0.006148 moles

0.07510 moles

Seven grams of nitrogen, N2, (N, atomic mass 14 amu) contains ________. 1 mole of nitrogen atoms 0.5 moles of nitrogen atoms 0.25 moles of nitrogen atoms Not enough information is given

0.5 moles of nitrogen atoms

What is the number of moles of H2O produced if you combust 0.5 mole of CH4 according to the following balanced equation? CH4 + 2 O2 → CO2 + 2 H2O 2 moles 4 moles 6 moles 8 moles 1 mole

1 mole

Fourteen grams of nitrogen, N2, (N, atomic mass 14 amu) contains ________. 1 mole of nitrogen atoms 0.5 moles of nitrogen atoms 0.25 moles of nitrogen atoms Not enough information is given

1 mole of nitrogen atoms

Which is of these is the correct ratio of sulfur to oxygen in SO2? 1 sulfur: 2 oxygen 2 sulfur: 1 oxygen 2 sulfur: 2 oxygen 2 sulfur: 3 oxygen 1 sulfur: 3 oxygen

1 sulfur: 2 oxygen

Balance the following chemical equation. ____ N2 + ____ H2 → ____ NH3 1, 3, 2 1, 2, 3 3, 2, 1 2, 6, 4 1/2, 3/2, 1

1, 3, 2

How many moles of oxygen atoms are in a 0.6163 grams of niacin, C6H5NO2? 5.14 × 10−2 moles 3.00 × 10−2 moles 1.00 × 10−2 moles 5.01 × 10−3 moles 8.56 × 10−3 moles

1.00 × 10−2 moles

Which is greater: 1.01 amu of hydrogen or 1.01 grams of hydrogen? 1.01 amu of hydrogen is greater than 1.01 grams of hydrogen. 1.01 grams of hydrogen is greater than 1.01 amu of hydrogen 1.01 grams of hydrogen and 1.01 amu of hydrogen have the same mass. Not enough information information is provided.

1.01 grams of hydrogen is greater than 1.01 amu of hydrogen

A 1.00 carat pure diamond has a mass of 0.20 grams. How many carbon atoms are there within this diamond? 6.02\:\times10^{23} 2.0\:\times10^{23} 1.0\:\times10^{23} 1.0\:\times10^{22}

1.0\:\times10^{22}

Using the old English measurements of volume listed, determine the number of hogsheads in five kilderkins. 1 gill = 1 noggin 1 butt = 2 hogsheads 1 kilderkin = 2 firkins 1 firkin = 9 gallons 1 hogshead = 52.458 gallons 1 peck = 64 noggins 1 peck = 2 gallons 1.72 hogsheads 2.91 hogsheads 90 hogsheads 4,721 hogsheads 42,489 hogsheads

1.72 hogsheads

If it takes 20 beryllium atoms to equal the mass of two krypton atoms, what is the relative mass of beryllium compared to krypton? 1/10 1/20 40 times 100 times 10 times

1/10

If it takes three carbon atoms to equal the mass of one chlorine atom, what mass of chlorine do you need to equal the number of atoms in one kilogram of carbon? 1/3 of a kg 30 kg 1 kg 3 kg 6 kg Answer: A Diff: 1 Learning Obj: 9.2 Global Obj: G-4

1/3 of a kg

If it takes three golf balls to equal the mass of one tennis ball, what mass of tennis balls do you need to equal the number of golf balls in one kilogram of golf balls? 1/3 of a kg 30 kg 1 kg 3 kg

1/3 of a kg

An international group of zookeepers with successful breeding programs made the following animal exchanges last year. Using the same bartering system, how many anteaters can a zoo obtain in exchange for 4 oryxes? 3 oryxes = 1 tiger 2 flamingos = 1 anteater 1 camel = 6 anteaters 5 lemurs = 1 rhino 1 rhino = 4 monkeys 3 lemurs = 1 camel 3 monkeys = 1 tiger 1 rhino = 4 oryxes 6 anteaters 10 anteaters 15 anteaters 20 anteaters 30 anteaters

10 anteaters

How many moles carbon atoms are in 5 moles of ethanol, CH3CH2OH? 2.5 mole 5 moles 10 moles 30 moles 120 moles

10 moles

How many grams of water are produced when 10.0 grams of O2 react with excess H2? 2H2 + O2(g) → 2H2O 11.25 grams 20 grams 46 grams 180 grams 360 grams

11.25 grams

How many grams of nitrogen dioxide are required to produce 260 grams of nitrogenmonoxide? 3NO2 + H2O → 2HNO3 + NO 8.67 grams 56.52 grams 132 grams 399 grams 1196 grams

1196 grams

There are 1000 liters in 1 cubic meter and 1000 grams in 1 kilogram. How many grams of air are there in 0.01liter of air? (Assume a density of 1.25 kg/L.) 0.00125 gram 0.125 gram 1.25 grams 12.5 grams

12.5 grams

An international group of zookeepers with successful breeding programs made the following animal exchanges last year. Using the same bartering system, how many flamingos can a zoo obtain in exchange for 6 rhinos? 3 oryxes = 1 tiger 2 flamingos = 1 anteater 1 camel = 6 anteaters 5 lemurs = 1 rhino 1 rhino = 4 monkeys 3 lemurs = 1 camel 3 monkeys = 1 tiger 1 rhino = 4 oryxes 10 flamingos 30 flamingos 50 flamingos 120 flamingos 160 flamingos

120 flamingos

What is the molecular weight of PCl3? 66.5 amu 106.5 amu 137.5 amu 180 amu 360 amu

137.5 amu

What is the mass of an oxygen atom, O, in atomic mass units? 12 amu 16 amu 18 amu 32 amu

16 amu

Nicotine has the chemical formula C10H14N2. What is the molecular weight of nicotine? 26 amu 81 amu 138 amu 162 amu 366 amu

162 amu

What is the formula mass of a molecule of C6H12O6? 180 amu 24 amu 29 amu 168 amu

180 amu

Given that the bond energy of N2 is 946 kJ/mole, the bond energy of O2 is 498 kJ/mole and the NO bond energy is 631 kJ/mole, how much energy is required to react 1 mole of nitrogen molecules according to the following reaction? N2 + O2 → 2 NO 182 kJ -182 kJ 813 kJ -813 kJ

182 kJ

What is the coefficient in front of sodium nitride when the equation is balanced? __ Na3N → __ Na(s) + __ N2(g) 0 1 2 3 4

2

What is the number of moles of H2O produced if you combust one mole of CH4 according to the following balanced equation? CH4 + 2 O2 → CO2 + 2 H2O 8 moles 6 moles 4 moles 2 moles

2 moles

Which of the following has the largest mass of oxygen? 16.0 g of O2 0.500 mol of O2 2 moles of O atoms 10 grams of carbon dioxide CO2 All of these have the same mass of oxygen.

2 moles of O atoms

How many moles of calcium atoms are 2.5 moles of calcium carbonate, CaCO3? 1 mole 1.25 moles 2.5 moles 5.0 moles 100 moles

2.5 moles

What is the number of grams of CO2 produced if you combust 0.50 mole of CH4 according to the following balanced equation? CH4 + 2 O2 → CO2 + 2 H2O 22 g 10 g 44 g 32 g

22 g

How many grams of water, H2O, can be produced from the reaction of 25.0 grams of hydrogen, H2, and 225 grams of oxygen, O2? 250 grams 225 grams 200 grams 9 25 grams

225 grams

How many grams are in 2.35 moles of calcium carbonate, CaCO3? 0.01175 grams 0.0235 grams 0.0588 grams 107 grams 235 grams

235 grams

An international group of zookeepers with successful breeding programs made the following animal exchanges last year. Using the same bartering system, how many monkeys can a zoo obtain in exchange for 10 camels? 3 oryxes = 1 tiger 2 flamingos = 1 anteater 1 camel = 6 anteaters 5 lemurs = 1 rhino 1 rhino = 4 monkeys 3 lemurs = 1 camel 3 monkeys = 1 tiger 1 rhino = 4 oryxes 6 monkeys 12 monkeys 15 monkeys 24 monkeys 30 monkeys

24 monkeys

How many chromium atoms are in 78.8 g or K2Cr2O7? 2.24 × 1024 atoms 1.12 × 1024 atoms 3.23 × 1023 atoms 1.61 × 1023 atoms 2.25 × 1022 atoms

3.23 × 1023 atoms

How many moles of tetraphosphorous decaoxide will form when 3.30 moles of P4 react with oxygen gas? P4 + 5O2 → P4O10 0.825 moles 3.3 moles 13.2 moles 16.5 moles 20 moles

3.3 moles

Using the old English measurements of volume listed, determine the number of noggins in one butt. 1 gill = 1 noggin 1 butt = 2 hogsheads 1 kilderkin = 2 firkins 1 firkin = 9 gallons 1 hogshead = 52.458 gallons 1 peck = 64 noggins 1 peck = 2 gallons 104.92 noggins 128.00 noggins 209.83 noggins 1678.7 noggins 3357.3 noggins

3357.3 noggins

What is the molecular weight of cholesterol, C27H46O? 194 amu 208 amu 224 amu 180 amu 386 amu

386 amu

How many moles of oxygen gas will react with 6.2 moles of aluminum? 4Al(s) + 3O2(g) → 2Al2O3(s) 0.12 moles 1.55 moles 2.4 moles 4.65 moles 8.27 moles

4.65 moles

How many grams of methanol (CH3OH) are produced when 5.00 kg of H2 reacts with excess carbon monoxide? CO + 2H2 → CH3OH 40 g 80 g 320 g 640 g 40,000 g

40,000 g

What is the formula mass of a molecule of CO2? 44 amu 56 amu 58.9 amu 118 amu

44 amu

How many oxygen molecules are needed to make 10 carbon dioxide molecules according to the following balanced chemical equation? 2 CO + O2 → 2 CO2 5 1 4 10

5

Which of these is the correct SUM of the coefficients when the equation is balanced? __ CaCl2(aq) + __ K2CO3(aq) → __ KCl(aq) + __ CaCO3(s) 2 4 5 8 10

5

How many bonds (in total) between nitrogen and hydrogen are formed if you react nitrogen with hydrogen according to the following reaction? N2 + 3H2 → 2 NH3 1 4 3 6 8

6

What is the coefficient in front of HF when the equation is balanced? __ B2O3 + __ HF → __ BF3 + __ H2O 1 2 3 5 6

6

According to the following balanced chemical equation, if you want to generate two moles of H2O , how many molecules of O2 do you need? 2 H2 + O2 → 2 H2O 1 2 1/2 4 6.022 × 1023

6.022 × 1023

Which of the following does not contain the same number of chlorine atoms as 60 CCl4 molecules? 240 HCl molecules 120 chlorine molecules 40 SCl6 molecules 80 CFCl3 molecules 60 CHCl3 molecules

60 CHCl3 molecules

How many moles hydrogen atoms are in 3 moles of codeine, C18H21NO3? 3 mole 21 moles 36 moles 54 moles 63 moles

63 moles

How many grams of carbon dioxide are produced when 18.5 moles of oxygen react with acetylene, 2C2H2 + 5O2(g) → 4CO2 + 2H2O 2,035 grams 814 grams 651 grams 88 grams 37 grams

651 grams

How many grams of gallium are there in a 145 gram sample of gallium arenside, GaAs? 74.9 g 69.7 g 145 g 6.02 × 1023 g

69.7 g

Which has more atoms: 17.031 g of ammonia, NH3 (17.031 amu), or 72.922 g of hydrogen chloride, HCl (36.461 amu)? 17.031 g of NH3 has more atoms than 72.922 g of HCl 72.922 g of HCl has more atoms than 17.031 g of NH3 72.922 g of HCl and 17.031 g of NH3 have about the same number of atoms. Not enough information is given.

72.922 g of HCl and 17.031 g of NH3 have about the same number of atoms.

How many grams of water, H2O, can be produced by the reaction of 8 grams of oxygen, O2, and 8 grams of hydrogen, H2? 16 grams 10 grams 9 grams 8 grams

9 grams

How many hydrogen atoms are in 25.6 grams of sucrose, (C12H22O11)? 1.647 atoms 2.6 × 1023 atoms 4.51 × 1022 atoms 6.02 × 1023 atoms 9.92 × 1023 atoms

9.92 × 1023 atoms

Which of the following statements about catalysts is NOT true? A catalyst alters the rate of a chemical reaction. A catalyst can be consumed in a reaction as long as it is regenerated. A catalyst can be used to speed up slow reactions. A catalyst does not change the energy of the reactants or the products. All of the above are true.

All of the above are true

Which of the following is not true for 3 moles of CaCO3? It contains 3 moles of O. It contains 3 moles of Ca. It contains 3 moles of C. It contains 9 moles of O. None of the above.

It contains 3 moles of O.

If it takes energy to break bonds and you gain energy in the formation of bonds, how can some reactions be exothermic while others are endothermic? It is the total amount of energy that matters. Sometimes some bonds are stronger than others and so you gain or lose energy when you form them. It is the total number of bonds that matters. Sometimes you create more bonds than you break and since all bonds have same amount of energy you gain or lose energy depending on the number of bonds. Some reactants have more energetic bonds than others and they will always release energy. Some products have more energy than others and they always require energy to be formed.

It is the total amount of energy that matters. Sometimes some bonds are stronger than others and so you gain or lose energy when you form them.

Which of these is the correct formula for potassium phosphate? KPO4 K3PO4 K(PO4)3 K2(PO4)3 K3P

K3PO4

Methane can be decomposed into two simpler substances, hydrogen and carbon. Therefore, methane is a gas. is an element. is a mixture. is a compound. must have the formula CH.

is a compound.

Metals tend to ____ electrons and form ions with a ____ charge? lose, positive lose, negative gain, positive gain, negative lose , zero

lose, positive

Which of these is the correct name for MgCl2? magnesium chloride magnesium chlorine magnesium trichloride magnesium monochlorine monomagnesium trichloride

magnesium chloride

What is an exothermic reaction? It is a reaction that requires heat as a reactant. It is a reaction where the products have more energy than the reactants. It is a reaction where there is a net adsorption of energy from a reaction. all of the above none of the above

none of the above

Which of these substances is a compound? air salt water gasoline salt lemonade

salt

Which of these is the correct name for NaHCO3? sodium carbonate sodium trioxide sodium monocarbide sodium bicarbonate sodium carbide oxide

sodium bicarbonate

Entropy is a measure of ________. disorder the spreading of energy solar energy thermodynamics

the spreading of energy

Which of these is an ionic compound? AlCl3 H2O SiO2 IBr S8

AlCl3

Which of these is not a covalent compound? H2O TeCl4 XeF4 C2H2 AlCl3

AlCl3

Which is of these is the correct chemical formula for carbon tetrachloride? CCl3 CCl4 CCl5 C4Cl None of the above

CCl4

Which of these is not a covalent compound? SiO2 CH4 N2O CaO ICl3

CaO

In a chemical reaction, the bonds being formed are ________. the same as the ones broken different from the ones broken more energetic than the ones broken less energetic than the ones broken

different from the ones broken

Which of these is the correct name for N2O3? nitrogen trioxide trinitrogen dioxide dinitrogen trioxide nitrogen dioxygenide dinitrogenide dioxygenide

dinitrogen trioxide

Which of these will not form a negative ion in an ionic compound? Br N Se I Al

Al

Which of these is the correct formula for aluminum oxide? Al2O2 Al2O3 AlO Al3O2 AlO2

Al2O3

Are the chemical reactions that take place in a disposable battery exothermic or endothermic? Is the reaction going on in a rechargeable battery while it is recharging exothermic or endothermic? An operating disposable battery is driven by endothermic reaction, while a recharging rechargeable battery is also driven by endothermic reactions. An operating disposable battery is driven by exothermic reaction, while a recharging rechargeable battery is driven by endothermic reactions. An operating disposable battery is driven by endothermic reaction, while a recharging rechargeable battery is driven by exothermic reactions. An operating disposable battery is driven by exothermic reaction, while a recharging rechargeable battery is also driven by exothermic reactions.

An operating disposable battery is driven by exothermic reaction, while a recharging rechargeable battery is driven by endothermic reactions.

Barium fluoride is often used in glass manufacturing. Which of these is the correct formula and bonding type for barium fluoride? BaF, ionic BaF, covalent BaF2, ionic BaF2, covalent Ba2F, ionic

BaF2, ionic

For the following balanced reaction, which of the following is a gas? 2 Na(l) + Cl2(g) → 2 NaCl(s) Na Cl2 Cl NaCl

Cl2

Which of these statements about covalent compounds is incorrect? Covalent bonds involve the combination of two nonmetals. Covalent compounds dissolve in water to form electrolyte solutions. Covalent compounds contain atoms which share electrons to gain stability. The bonds in covalent compound are often oriented in a particular direction. Electrons in covalent compounds are not always equally shared between atoms.

Covalent compounds dissolve in water to form electrolyte solutions.

Which of the following statements is not in line with the concepts of thermodynamics? Energy has a tendency to stay in one place. Energy is neither created nor destroyed. The entropy of the universe is constantly increasing. The energy released in a chemical reaction is the same as the difference in the energy of the bonds broken and formed. All of the above describe the concepts of thermodynamics.

Energy has a tendency to stay in one place.

Bond energies increase in going from C-N (lowest) to C-O to C-F (highest). Explain this trend based upon the atomic sizes of these atoms as deduced from their positions in the periodic table. In going from nitrogen to oxygen to fluorine the atoms get larger. This means a greater nuclear charge, which translates into stronger chemical bonds. In going from nitrogen to oxygen to fluorine the atoms get smaller. This means a greater nuclear charge, which translates into stronger chemical bonds. In going from nitrogen to oxygen to fluorine the atoms get larger. This means that the bonding atoms are farther apart, which translates into a greater bond energy. In going from nitrogen to oxygen to fluorine the atoms get smaller. This means that the bonding atoms are closer together, which translates into a greater bond energy.

In going from nitrogen to oxygen to fluorine the atoms get smaller. This means that the bonding atoms are closer together, which translates into a greater bond energy.

Which of these is an ionic compound? NCl3 Li2O PF5 CH4 I2

Li2O

Which of these substances is a compound? Na Cl2 Pb NO H2

NO

A tiny crystal of sodium chloride contains 5,000,000 sodium ions and 5,000,000 chloride ions. The correct formula for sodium chloride is: NaCl Na5Cl5 Na50Cl50 It could be any of the above. None of the above

NaCl

For the following balanced reaction, which of the following is a solid? 2 Na(l) + Cl2(g) → 2 NaCl(s) Na Cl2 Cl NaCl

NaCl

Which of these will not form a positive ion in an ionic compound? Ba Rb P Sn Mg

P

Which of the following is a correctly balanced equation? P4 + 6 H2 → 4 PH3 1 P4 + 6 H2 → 4 PH3 0 P4 + 6 H2 → 4 PH3 2 P4 + 12 H2 → 8 PH3 P4 + 3 H2 → PH3

P4 + 6 H2 → 4 PH3

What is the correct name of K2O? Dipotassium monoxide Dipotassium oxide Potassium monoxide Potassium oxygen Potassium oxide

Potassium oxide

Why is the equation incorrect? Mg3 + N2 → Mg3N2 The equation is not balanced. The coefficient of N2 is incorrect. The valence of the nitride ion is incorrect. Some of the subscripts are incorrectly used. The valance of the magnesium ion is incorrect.

Some of the subscripts are incorrectly used.

A friend argues that if mass were really conserved he would never need to refill his gas tank. What explanation do you offer your friend? The atoms (mass) of gasoline are converted into energy by the engine according to E = mc^2 \,\!. The Law of Conservation of Mass does not apply to reactions involving combustion or explosion of matter. The atoms (mass) of gasoline are converted into exhaust fumes. The oil companies make gasoline in a way that it gets used up so that we are always required to replenish it.

The atoms (mass) of gasoline are converted into exhaust fumes.

Nonmetals tend to ____ electrons and form ions with a ____ charge? lose, positive lose, negative gain, positive gain, negative lose , zero

gain, negative

What happens to the entropy of a system as the components of the system are introduced to a larger number of possible arrangements, such as when liquid water transforms into water vapor? The entropy decreases because there are less ways in which the energy can disperse. The entropy increases because there are more ways in which the energy can disperse. The entropy of a system is independent of introducing the components of the system to a larger number of possible arrangements. The entropy of a system is solely dependent upon the amount of material undergoing reaction.

The entropy increases because there are more ways in which the energy can disperse.

How does formula mass differ from atomic mass? They represent the same thing. The formula mass of a substance is the sum of the atomic masses of the elements is its chemical formula. The atomic mass is the mass of a single atom. The atomic mass of a substance is the sum of the formula masses of the elements is its chemical formula. The atomic mass is the mass of a single atom. The formula mass is the mass of the chemical formula and the atomic mass is the mass of the molecule.

The formula mass of a substance is the sum of the atomic masses of the elements is its chemical formula. The atomic mass is the mass of a single atom.

Chlorine is put into the atmosphere by volcanoes in the form of hydrogen chloride, HCl, but this form of chlorine does not remain in the atmosphere for very long. Why? The hydrogen chloride is destroyed by ultraviolet rays. The hydrogen chloride is washed away by atmospheric moisture. The hydrogen chloride reacts with atmospheric carbon dioxide. The hydrogen chloride degenerates into hydrogen and chlorine

The hydrogen chloride is washed away by atmospheric moisture.

Given the following generic chemical reaction, which is correct X → Y X is the product. Y is the product. → is the product. Both X and Y are the products. Both X and Y are the reactants.

Y is the product.

Why might increasing the concentration of a set of reactants increase the rate of reaction? You have increased the chances that any two reactant molecules will collide and react. You have increased the ratio of reactants to products. The concentration of reactants is unrelated to the rate of reaction. The rate of reaction depends only on the mass of the atoms and therefore increases as you increase the mass of the reactants. none of the above

You have increased the chances that any two reactant molecules will collide and react.

Which of these is the correct name for Ca(OH)2? calcium carbonate calcium oxide calcium dihydride calcium oxygen hydride calcium hydroxide

calcium hydroxide

What is the formula mass of sulfur dioxide? about 16 amu about 32 amu about 60 amu about 64 amu

about 64 amu

Ozone, O3, is ________. a pollutant a naturally occurring compound an elemental material all of the above

all of the above

What is an endothermic reaction? It is a reaction that requires heat as a reactant. It is a reaction where the products have more energy than the reactants. It is a reaction where there is a net adsorption of energy from a reaction. all of the above

all of the above

Why is heat often added to chemical reactions performed in the laboratory? to allow a greater number of reactants to pass over the activation energy to increase the rate at which reactant collide to compensate for the natural tendency of energy to disperse all of the above

all of the above

In a chemical equation the coefficients ________. of the reactants should always sum up to those of the products appear as subscripts appear before the chemical formulas Two of the above are correct.

appear before the chemical formulas