Question

equations” - ws #1 directions: convert the following word equations into formula equations by changing element and compound names into chemical formulas. 1. sodium + oxygen → sodium oxide 2. copper + silver nitrate → copper(ii) nitrate + silver 3. aluminum chlorate + barium sulfate → aluminum sulfate + barium chlorate 4. bromine + calcium iodide → calcium bromide + iodine 5. zinc sulfide + magnesium arsenate → zinc arsenate + magnesium sulfide 6. cobalt + lead(ii) nitrite → cobalt(iii) nitrite + lead 7. potassium + water → potassium hydroxide + hydrogen

Explanation:

Problem 1:

Step 1: Identify formulas

Sodium is $Na$, oxygen (diatomic) is $O_2$, sodium oxide is $Na_2O$.

Step 2: Write equation

Balance the equation. Number of Na: left 1, right 2; O: left 2, right 1. So multiply Na by 4, $O_2$ by 1, $Na_2O$ by 2.

$$4Na + O_2 ightarrow 2Na_2O$$

Step 1: Identify formulas

Aluminum chlorate: $Al(ClO_3)_3$, barium sulfate: $BaSO_4$, aluminum sulfate: $Al_2(SO_4)_3$, barium chlorate: $Ba(ClO_3)_2$.

Step 2: Write equation

Balance the equation. Al: left 1, right 2 → multiply $Al(ClO_3)_3$ by 2. SO₄: left 1, right 3 → multiply $BaSO_4$ by 3. Ba: left 3, right 1 → multiply $Ba(ClO_3)_2$ by 3. ClO₃: left 6, right 6.

$$2Al(ClO_3)_3 + 3BaSO_4 ightarrow Al_2(SO_4)_3 + 3Ba(ClO_3)_2$$

Step 1: Identify formulas

Bromine (diatomic): $Br_2$, calcium iodide: $CaI_2$, calcium bromide: $CaBr_2$, iodine (diatomic): $I_2$.

Step 2: Write equation

Balance the equation. Br: left 2, right 2; I: left 2, right 2; Ca: left 1, right 1.

$$Br_2 + CaI_2 ightarrow CaBr_2 + I_2$$

Answer:

$$4Na + O_2 ightarrow 2Na_2O$$

Problem 3: