Bonding and Bonding and Chemical Formulas Chemical Formulas Chapter 23 Review Chapter 23 Review
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.