Explain how synthesis and decomposition reactions can be the reverse of one another.

Is the following a correct net ionic equation? Explain. $\mathrm{Na}^{+}(a q)+\mathrm{Cl}^{-}(a q) \longrightarrow \mathrm{NaCl}(a q)$

Describe evidence that chemical reactions take place during a fireworks display.

Describe evidence that burning gasoline in an engine is a chemical reaction.

When propane gas, $C_3H_8$, is burned with oxygen, the products are carbon dioxide and water. Write an unbalanced formula equation for the reaction.

Give four examples of evidence that suggests that a chemical change probably is occurring.

When balancing an equation, should you adjust the subscripts or the coefficients?

Magnesium oxide forms from magnesium metal and oxygen gas. Write a word equation and an unbalanced formula equation. Include all of the appropriate notations.

Solid silicon and solid magnesium chloride form when silicon tetrachloride gas reacts with magnesium metal. Write a word equation and an unbalanced formula equation. Include all of the appropriate notations.

What symbol is used in a chemical equation to indicate “produces” or “yields”?

What does “Mn” above the arrow in a formula equation mean?

When water boils on the stove, does a chemical change or a physical change take place?

Define each of the following terms: a. decomposition reaction, b. double-displacement reaction, c. spectator ions, d. activity series.

Balance each of the following: a. $\mathrm{Fe}+\mathrm{O}_{2} \longrightarrow \mathrm{Fe}_{2} \mathrm{O}_{3}$ b. $\mathrm{H}_{2} \mathrm{O}_{2} \longrightarrow \mathrm{H}_{2} \mathrm{O}+\mathrm{O}_{2}$ c. $\mathrm{C}_{8} \mathrm{H}_{18}+\mathrm{O}_{2} \longrightarrow \mathrm{CO}_{2}+\mathrm{H}_{2} \mathrm{O}$ d. $\mathrm{Al}+\mathrm{F}_{2} \longrightarrow \mathrm{AlF}_{3}$.