Question

1. this is an example of a chemical equation. h is the chemical symbol for hydrogen, o is oxygen, and h₂o is known as water. 2 h₂ + o₂ → 2 h₂o a. how would this equation read in words? b. how many molecules of water are on the product side of this equation? c. how many atoms of oxygen are on the product side of this equation? d. how many atoms of oxygen are on the reactant side of the equation? e. how many molecules of oxygen gas are on the reactant side of the equation? 5. when a candle burns, the wax is combined with oxygen and is changed into new substances. the new substances are mostly carbon (c), carbon dioxide (co₂), and water (h₂o). we could write a chemical equation in words to represent the change that occurs: wax + oxygen → carbon + carbon dioxide + water we can rewrite the products in the equation as molecular formula: wax + o₂ → c + co₂ + h₂o questions: what elements are the wax of the candle made of? how do you know?

Explanation:

Step1: Read chemical equation in words

The left - hand side has 2 molecules of hydrogen gas and 1 molecule of oxygen gas, and the right - hand side has 2 molecules of water. So it reads "Two molecules of hydrogen gas react with one molecule of oxygen gas to produce two molecules of water."

Step2: Count water molecules on product side

The coefficient in front of $H_2O$ is 2, so there are 2 water molecules on the product side.

Step3: Count oxygen atoms on product side

In each $H_2O$ molecule, there is 1 oxygen atom. Since there are 2 $H_2O$ molecules, there are 2 oxygen atoms on the product side.

Step4: Count oxygen atoms on reactant side

In the $O_2$ molecule, there are 2 oxygen atoms, so there are 2 oxygen atoms on the reactant side.

Step5: Count oxygen gas molecules on reactant side

The coefficient in front of $O_2$ is 1, so there is 1 oxygen gas molecule on the reactant side.

Step6: Determine elements in wax

Based on the chemical equation of candle - burning ($Wax + O_2
ightarrow C + CO_2 + H_2O$), since carbon (C), carbon dioxide ($CO_2$), and water ($H_2O$) are produced, and oxygen comes from the oxygen in the air, the wax must contain carbon (C) and hydrogen (H) elements.

Answer:

a. Two molecules of hydrogen gas react with one molecule of oxygen gas to produce two molecules of water.
b. 2
c. 2
d. 2
e. 1
What elements are the wax of the candle made of? Carbon and hydrogen.
How do you know? Based on the products of the candle - burning chemical reaction and the fact that oxygen comes from the air.