P199 Chapter 17 Homework

Balance the following chemical equation. ________ N2 + ________ H2 → ________ NH3

*1, 3, 2* 1, 2, 3 1/2, 3/2, 1 3, 2, 1 2, 6, 4

Which equation best describes the reaction represented in the illustration above?

*2 BA2 + 2 CDA3 + A2 → 2 DBA4 + 2 CA2* 2 AB2 + 2 CDA3 + B2 → 2 C2A4 + 2 DBA 2 AB2 + 2 DCB3 + B2 → 2 DBA4 + 2 CA2 2 AB2 + 2 CDA3 + A2 → 2 DBA4 + 2 CA2

Assume the illustrations above are two frames of a movie—one from before the reaction and the other from after the reaction. Which equation best describes each reaction shown above?

*2AB2+2CDA3+B2→2C2A4+2DBA* 2AB2+2CDA3+A2→2DBA4+2CA2 2BA2+2DCA3+A2→2DBA4+2CA2 2AB2+2DCB3+B2→2DBA4+2CA2

How many grams of water, H2O, and propene, C3H6, can be formed from the reaction of 6.0 g of 2-propanol, C3H8O? C3H8O → C3H6 + H2O 2-Propanol Propene Water

*4.2 grams of propene, 1.8 grams of water* 0.0 grams of propene, 6.0 grams of water 6.0 grams of propene, 0.0 grams of water 1.8 grams of propene, 4.2 grams of water

What is a chemical equation?

*It is a shorthand notation for illustrating a chemical reaction.* It is any type of reaction that takes place at the equator. It is a picture of the atoms undergoing a chemical equalization. It is the sum of the masses of the products and reactants. It is the chemical combination of equal numbers of reactants and products.

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

*NaCl* Na Cl2 Cl 2 Na

Which of the following is a correctly balanced equation?

*P4 + 6 H2 → 4 PH3* P4 + 3 H2 → PH3 1 P4 + 6 H2 → 4 PH3 0 P4 + 6 H2 → 4 PH3 2 P4 + 12 H2 → 8 PH3

How many moles of water, H2O, are produced from the reaction of 16 grams methane, CH4, with an unlimited supply of oxygen, O2. How many grams of H2O is this? CH4 + 2 O2 → CO2 + 2 H2O

0.889 mole, which is 16 grams 1.0 mole of water, which is 18 grams 2.0 moles of water, which is 32 grams *2.0 moles of water, which is 36 grams *

How many diatomic molecules are represented in the illustration above?

1 *2* 3 4

If you had 1 mole of marbles, how many marbles would you have? How about 2 moles?

1 amu and 2 amu 1.8 × 1018 and 3.6 × 1018 1 myriad and 2 myriads *6.02 × 1023 and 12.04 × 1023*

What is the number of molecules of O2 consumed if you combust one mole of CH4 according to the following balanced equation? CH4 + 2 O2 → CO2 + 2 H2O

1 molecule 6.022 × 1023 molecules *1.204 × 024 molecules* 2 molecules 1 g of molecules

Which is greater: 1.01 amu of hydrogen or 1.01 grams of hydrogen?

1.01 grams of hydrogen and 1.01 amu of hydrogen have the same mass. 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* Not enough information information is provided.

Two amu equals how many grams?

1.204 × 10-22 grams 2 grams 1.661 × 10-24 grams *3.322 × 10-24 grams*

What is the mass of an oxygen atom, O, in atomic mass units?

12 amu 32 amu *16 amu* 18 amu

Assume the following illustrations are two frames of a movie—one from before the reaction and the other from after the reaction. How many diatomic molecules are represented in this movie?

2

Balance the following equation. ________ H2 (g) + ________ N2 (g) → ________ NH3 (g)

2, 2, 3 3, 3, 2 *3, 1, 2* 2, 2, 5

How many grams of water can be produced from the combination of 25.0 grams of hydrogen and 225 grams of oxygen?

200 grams *225 grams* 250 grams 25 grams

Which of the following has the greatest number of particles?

22.990 g of Na 9.012 g of Be 1 mole of Na 1 mole of Be *All are the same.*

Balance the following equation. ________ NO → ________ N2O + ________ NO2

6, 2, 1 3, 0, 0 1, 2, 4 *3, 1, 1* 4, 4, 8

What coefficient is needed in front of the O2 molecule to balance the following equation? 2 C4H10 (g) + ________ O2 (g) → 8CO2 (g) + 10 H2O (l)

8 5 1 *13*

Why is it important that a chemical equation be balanced?

because of the law of charge conservation *because of the law of mass conservation* because of the law of energy conservation because of the law of momentum conservation

How many oxygen atoms are indicated on the right side of this balanced chemical equation? 4 Cr(s) + 3 O2(g) → 2 Cr2O3(g)

four three *six* two

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

NaCl Na Cl *Cl2* 2 Na

Given the following generic chemical reaction, which is the reactant? X → Y

Y is the reactant. *X is the reactant* → is the reactant. Both X and Y are the products. Both X and Y are the reactants.

What is a chemical reaction?

when a new element is formed by rearranging nucleons when two solids mix together to form a heterogeneous mixture *when one or more new compounds are formed by rearranging atoms* when a liquid undergoes a phase change and produces a solid when two liquids mix to form a homogeneous mixture

For the following balanced equation, which has the highest coefficient? 4 H2 + 2 C → 2 CH4

CH4 C H4 *H2* none of the above

The reactants shown schematically below represent iron oxide, Fe2O3 and carbon monoxide, CO. Which of the following is the correct full balanced chemical equation for what is depicted?

Fe2O3 + 3 CO → 2 Fe + 3 C2O Fe2O3 + 3 CO → 3 FeO + 2 C *Fe2O3 + 3 CO → 2 Fe + 3 CO2* Fe2O3 + 3 CO → 3 FeO2 + 2 C

What is wrong with the following depiction of a chemical reaction?

One box contains more molecules than the other. These boxes contain only molecules but no atoms. *One box contains more atoms than the other.* All of the above

Part A: How many moles of atoms are there in: 28 g of nitrogen, N2. Part B: How many moles of atoms are there in 32 g of oxygen, O2. Part C: How many moles of atoms are there in 16 g of methane, CH4. Part B: How many moles of atoms are there in 38 g of fluorine, F2.

Part A: 2 mol Part B: 2 mol Part C: 5 mol Part D: 2 mol

What is the purpose of coefficients in a chemical equation?

The coefficient equals the mass of each component in the equation. *A coefficient shows the number of times an atom or compound must be counted.* The sum of the coefficient in the reactants must equal the sum of the coefficients in the products. The coefficients indicate whether a component is a solid, liquid, or gas.