What are the substances called that are present at the beginning of a chemical reaction?

• Products

• Reactants

• Catalysts

• Enzymes

Tags

NGSS.MS-PS1-1

Which of the following is an example of an endothermic reaction?

• Freezing water

• Burning wood

• Baking bread

• Condensation

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-3

Which of the following is an indicator of a chemical reaction involving a change in color?

• Gas formation

• Temperature change

• Colour change

• Odour

Tags

NGSS.MS-PS1-2

What happens to atoms during a chemical reaction?

• They are destroyed

• They are created

• They are rearranged

• They disappear

Tags

NGSS.MS-PS1-5

What is the product when hydrogen gas reacts with oxygen gas?

• Hydrogen peroxide

• Water

• Oxygen gas

• Hydrogen gas

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

When hydrogen gas is added to oxygen gas and ignited, what new substance is formed?

• Hydrogen peroxide

• Water

• Carbon dioxide

• Methane

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following is NOT true according to the Law of Conservation of Mass?

• Matter can be created during a chemical reaction.

• Matter can neither be created nor destroyed during a chemical reaction.

• The total mass of reactants equals the total mass of products.

• The mass of the products is the same as the mass of the reactants.

Tags

NGSS.MS-PS1-5

What does the Law of Conservation of Mass imply about the products of a chemical reaction?

Tags

NGSS.MS-PS1-5

Who proposed the Law of Conservation of Mass and the Law of Constant Proportions?

• Isaac Newton

• Antoine-Laurent Lavoisier

• Albert Einstein

• Marie Curie

Tags

NGSS.MS-PS1-5

What did Lavoisier's laws help us to understand?

• The structure of the solar system

• The behavior of light

• How atoms bond together

• The theory of relativity

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5