Download Bonding and Chemical Formulas Review

Bonding and Chemical
Formulas
Chapter 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.