2024-2025 RC 1 Properties of Matter Review

What does the Law of Conservation of Mass state?

• A. Mass is created in chemical reactions

• B. Mass is destroyed in chemical reactions

• C. Mass is neither created nor destroyed in chemical reactions

• D. Mass changes depending on the type of reaction

Tags

NGSS.MS-PS1-5

Which of the following best explains why mass is conserved in a chemical reaction?

• Atoms disappear after a reaction

• Atoms rearrange but are not lost or gained

• New atoms are created during the reaction

• Atoms turn into energy

Tags

NGSS.MS-PS1-5

Which of the following correctly represents the balanced equation for photosynthesis?

• CO₂ + H₂O → C₆H₁₂O₆

• 6CO₂ + 6H₂O → C₆H₁₂O₆ + O₂

• 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂

• C₆H₁₂O₆ + O₂ → CO₂ + H₂O

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

In the reaction 2H₂ + O₂ → 2H₂O, how many total oxygen atoms are present before and after the reaction?

• A. 2

• B. 4

• C. 6

• D. 2 before and 2 after

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

Which statement correctly describes the role of chemical equations in demonstrating conservation of mass?

• A. They show that atoms are created during reactions

• B. They show that the number of atoms before and after a reaction is the same

• C. They prove that elements change into new elements

• D. They show that matter is lost as heat

Tags

NGSS.MS-PS1-5

Why must chemical equations be balanced?

• To follow the Law of Conservation of Mass

• To show new atoms are formed

• To show energy is created

• To reduce the number of atoms

Tags

NGSS.MS-PS1-5

In the reaction CH₄ + 2O₂ → CO₂ + 2H₂O, how many hydrogen atoms are present before and after the reaction?

• A. 4 before, 4 after

• B. 2 before, 4 after

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A student conducts a reaction in a closed container and finds that the total mass remains the same before and after the reaction. What principle does this demonstrate?

• The Law of Inertia

• The Law of Conservation of Mass

• The Law of Conservation of Energy

• The Law of Gravity

Tags

NGSS.MS-PS1-5

How many oxygen atoms are in Al₂(SO₄)₃?

• A. 4

• B. 7

• C. 12

• D. 3

Tags

NGSS.MS-PS1-1

Which statement best describes the chemical formula H₂SO₄?

• It contains 1 hydrogen, 2 sulfur, and 4 oxygen atoms

• It contains 2 hydrogen, 1 sulfur, and 4 oxygen atoms

• It contains 4 hydrogen, 1 sulfur, and 2 oxygen atoms

• It contains 1 hydrogen, 4 sulfur, and 2 oxygen atoms

Tags

NGSS.MS-PS1-1