Chemical gasshshsnejxuushehehs
Here's a chart that will help you color in the periodic table for #20:
Answer:
Mass of the ball is . 42 kg. The density of air is 1.2 kg/m3.
Explanation:
<u>Answer</u><u>:</u>
Hydrocarbon and oxygen
<u>Explanation</u><u>:</u>
"a substance reacts with oxygen gas, it must involve O² as one of the reactants."
Using this, we can confirm Hydrocarbon and oxygen is a valid one.