Bonding and Bonding and Chemical FormulasChemical Formulas

Bonding and Bonding and Chemical FormulasChemical Formulas

Chapter 23 ReviewChapter 23 Review

1. What are the reactants in a chemical

reaction?

2. A chemical reaction that gives off energy (usually

as heat and/or light) is which

type of reaction?

3. Name two signs of a chemical change.

4. A chemical reaction that absorbs (takes in) energy, usually getting

colder, is which type of reaction?

5. What are the products in a chemical

reaction?

Balance the following chemical equation.

• 6. Calcium oxide, CaO, reacts with sulfur dioxide to form calcium sulfite, CaSO3.

Balance the following chemical equation.

• 7. Methanol, CH3OH, breaks down (decomposes) into carbon monoxide and hydrogen gas, H2.

Balance the following chemical equation.

• 8. When heated, tantalum metal reacts with chlorine gas, Cl2, to form tantalum pentachloride, TaCl5.

Balance the following chemical equation.

• 9. Nitric acid, HNO3, reacts with hydrogen sulfide, H2S, to form nitrogen dioxide, water,

• and sulfur.

Balance the following chemical equation.

• 10. Aluminum sulfate, Al2(SO4)3, decomposes to yield aluminum oxide, Al2O3, and sulfur trioxide, SO3.

• Stop

1. What are the reactants in a chemical

reaction?

• Beginning materials

2. A chemical reaction that gives off energy (usually

as heat and/or light) is which

type of reaction?

Exothermic

3. Name two signs of a chemical change.

• Production of smoke• Production of gas• Change in color• Change in temperature

4. A chemical reaction that absorbs (takes in) energy, usually getting

colder, is which type of reaction?

• Endothermic

5. What are the products in a chemical

reaction?

• The ending materials

Balance the following chemical equation.

• 6. Calcium oxide, CaO, reacts with sulfur dioxide to form calcium sulfite, CaSO3.

Balance the following chemical equation.

• 7. Methanol, CH3OH, breaks down (decomposes) into carbon monoxide and hydrogen gas, H2.

Balance the following chemical equation.

• 8. When heated, tantalum metal reacts with chlorine gas, Cl2, to form tantalum pentachloride, TaCl5.

Balance the following chemical equation.

• 9. Nitric acid, HNO3, reacts with hydrogen sulfide, H2S, to form nitrogen dioxide, water,

• and sulfur.

Balance the following chemical equation.

• 10. Aluminum sulfate, Al2(SO4)3, decomposes to yield aluminum oxide, Al2O3, and sulfur trioxide, SO3.