QUESTION $1$

What are the parts of a chemical equation?

Explain why chemical equations need to be balanced.

QUESTION$2$

Balance the following equations. The letters in parenthesis stand for s: solid I, liquid; g$,$ gas, and aq$,$ aqueous solution

$PC{l}_5(s)+H_{2}O(l)POC{l}_3(l)+HCl(aq)$

$Cu(s)+HN{O}_3(aq)Cu(N{O}_3)(aq)+H_{2}O(l)+NO(g)$

$Na(s)+H_{2}O(l)NaO{H}_{(aq)}+H_2(g)$

$(N{H}_4{)}_{2}C{r}_2{O}_7(s)C{r}_2{O}_3(s)+N_2(g)+H_{2}O(l)(g)$

$PtC{l}_4(s)Pt(s)+C{l}_2(g)$

QUESTION $3$

Fill in the type of reaction for the following:

$[$a$]$ Propane and oxygen produce carbon dioxide and water

$[$b$]$ Calcium Oxide is created from $Ca$ and $O$

$[$c$]$ Water through electrolysis is turned into hydrogen and oxygen

$[$d$]N{H}_3$ breaks down into hydrogen gas and nitrogen gas

$[$e$]$ lithium phosphate and aluminum chloride combine to form some lithium$-$chlorined and aluminum phosphate compounds

QUESTION $4$

Write a balanced reaction and tell the type of reaction for the following:

cyclopentane $(C_5{H}_{10})$ reacts with oxygen

Sodium hydroxide and Magnesium Chloride react to form two products.

magnesium and Copper $($I$)$ chloride react form copper and magnesium chloride

potassium nitride is somehow tumed into potassium and nitrogen

QUESTION $5$

Why do we need to balance equations.