4. this is an example of a chemical equation. h is the chemical symbol for hydrogen, o is oxygen, and h₂o is…

4. this is an example of a chemical equation. h is the chemical symbol for hydrogen, o is oxygen, and h₂o is known as water.\n2 h₂ + o₂ → 2 h₂o\na. how would this equation read in words?\nb. how many molecules of water are on the product side of this equation?\nc. how many atoms of oxygen are on the product side of this equation?\nd. how many atoms of oxygen are on the reactant side of the equation?\ne. how many molecules of oxygen gas are on the reactant side of the equation?\n5. 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:\nwax + oxygen → carbon + carbon dioxide + water\nwe can rewrite the products in the equation as molecular formula:\nwax + o₂ → c + co₂ + h₂o\nquestions: what elements are the wax of the candle made of? how do you know?

4. this is an example of a chemical equation. h is the chemical symbol for hydrogen, o is oxygen, and h₂o is known as water.\n2 h₂ + o₂ → 2 h₂o\na. how would this equation read in words?\nb. how many molecules of water are on the product side of this equation?\nc. how many atoms of oxygen are on the product side of this equation?\nd. how many atoms of oxygen are on the reactant side of the equation?\ne. how many molecules of oxygen gas are on the reactant side of the equation?\n5. 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:\nwax + oxygen → carbon + carbon dioxide + water\nwe can rewrite the products in the equation as molecular formula:\nwax + o₂ → c + co₂ + h₂o\nquestions: what elements are the wax of the candle made of? how do you know?

Answer

Explanation:

Step1: Read the 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 the product side

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

Step3: Count oxygen atoms on the 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 ($1\times2 = 2$).

Step4: Count oxygen atoms on the 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 the reactant side

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

Step6: Analyze elements in wax

According to the law of conservation of mass, the elements in the products must come from the reactants. The products of the wax - burning reaction are carbon ($C$), carbon dioxide ($CO_2$), and water ($H_2O$). Oxygen comes from the oxygen in the air. So the wax must contain carbon and hydrogen 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 For the wax - related questions: The wax of the candle is made of carbon and hydrogen elements. We know this because, according to the law of conservation of mass, the elements in the products (carbon, carbon dioxide, and water) must come from the reactants, and oxygen comes from the air during the burning process.