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

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

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. $\mathrm{Al}+\mathrm{F}_{2} \longrightarrow \mathrm{AlF}_{3}$.

Describe the forces, both attractive and repulsive, that occur as two atoms move closer together.

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

Balance each of the following: a. $\mathrm{H}_{2}+\mathrm{Cl}_{2} \longrightarrow \mathrm{HCl}$ b. $\mathrm{Al}+\mathrm{Fe}_{2} \mathrm{O}_{3} \longrightarrow \mathrm{Al}_{2} \mathrm{O}_{3}+\mathrm{Fe}$, c. $\mathrm{Ba}\left(\mathrm{ClO}_{3}\right)_{2} \longrightarrow \mathrm{BaCl}_{2}+\mathrm{O}_{2}$ d. $\mathrm{Cu}+\mathrm{HNO}_{3} \longrightarrow \mathrm{Cu}\left(\mathrm{NO}_{3}\right)_{2}+\mathrm{NO}+\mathrm{H}_{2} \mathrm{O}$.

Write a balanced equation for each of the following: a. propanol $(C_3H_7OH)$ + oxygen $\longrightarrow$ carbon dioxide + water. b. aluminum + iron(II) nitrate $\longrightarrow$ aluminum nitrate + iron. c. lead(IV) oxide $\longrightarrow$ lead(II) oxide + oxygen.

Write a balanced equation for each of the following: a. iron(III) oxide + magnesium $\longrightarrow$ magnesium oxide + iron. b. nitrogen dioxide + water $\longrightarrow$ nitric acid + nitrogen monoxide. c. silicon tetrachloride + water $\longrightarrow$ silicon dioxide + hydrochloric acid.

The saline solution used to soak contact lenses is primarily NaCl dissolved in water. Which of the following ways to represent the solution is not correct? a. $NaCl(aq)$, b. $NaCl(s)$, c. $Na^+(aq) + Cl^−(aq)$.

Explain why lattice energy is the key to the formation of a salt.

How should each of the following substances be represented in a total ionic equation? a. $KCl(aq)$, b. $H_2O(l)$, c. $Cu(NO_3)_2(aq)$, d. $AgCl(s)$.

Explain why a net ionic equation is the best way to represent a double-displacement reaction.

How could each of the following atoms react to achieve a noble-gas configuration? a. iodine, b. strontium, c. nitrogen, d. krypton.

Which ions in a total ionic equation are called spectator ions? Why?