Questions: Apex Learning - Courses /public/activity/4000001/assessment Pretest: Unit 4 Question 9 of 30 How does a balanced chemical equation show the conservation of mass? A. It shows that the total number of moles of substances stays the same. B. It shows that the mass of the products is greater than the mass of the reactants when a reaction increases the moles of substances. C. It shows that the mass of the reactants is greater than the mass of the products when gases are produced by the reaction. D. It shows that the number of each type of atom stays the same. SUBMIT ५ PREVious

Apex Learning - Courses
/public/activity/4000001/assessment
Pretest: Unit 4

Question 9 of 30
How does a balanced chemical equation show the conservation of mass?
A. It shows that the total number of moles of substances stays the same.
B. It shows that the mass of the products is greater than the mass of the reactants when a reaction increases the moles of substances.
C. It shows that the mass of the reactants is greater than the mass of the products when gases are produced by the reaction.
D. It shows that the number of each type of atom stays the same.
SUBMIT
५ PREVious

Transcript text: Apex Learning - Courses /public/activity/4000001/assessment Pretest: Unit 4 Question 9 of 30 How does a balanced chemical equation show the conservation of mass? A. It shows that the total number of moles of substances stays the same. B. It shows that the mass of the products is greater than the mass of the reactants when a reaction increases the moles of substances. C. It shows that the mass of the reactants is greater than the mass of the products when gases are produced by the reaction. D. It shows that the number of each type of atom stays the same. SUBMIT ५ PREVious

Solution

Solution Steps

Step 1: Understanding the Conservation of Mass

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction. This means that the total mass of the reactants must equal the total mass of the products.

Step 2: Analyzing the Options

Option A: This option suggests that the total number of moles stays the same. However, the conservation of mass is about the mass, not the number of moles, which can change depending on the reaction.
Option B: This option incorrectly states that the mass of the products is greater than the mass of the reactants, which contradicts the conservation of mass.
Option C: This option incorrectly states that the mass of the reactants is greater than the mass of the products, which also contradicts the conservation of mass.
Option D: This option correctly states that the number of each type of atom stays the same, which aligns with the conservation of mass. In a balanced chemical equation, the same number of each type of atom appears on both sides of the equation, ensuring that mass is conserved.

Step 3: Selecting the Correct Answer

The correct answer is the one that reflects the principle of conservation of mass by ensuring that the number of each type of atom remains constant throughout the reaction.