Unit 1 - Part 2: Lesson 2 - Property Changes Chemical Reactions

Which of the following is a correct description of a chemical change?

• The change only affects the appearance of a substance.

• The change results in the formation of new substances.

• The substance remains the same.

• Only the color of the substance changes.

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NGSS.MS-PS1-5

NGSS.MS-PS1-2

Which is NOT typically a sign of a chemical change?

• Formation of bubbles

• Change in color

• Melting

• Change in odor

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NGSS.MS-PS1-2

What is the law of conservation of mass?

• Mass is always lost in a chemical reaction.

• Mass remains the same before and after a reaction.

• Mass is gained after a chemical reaction.

• Mass only changes if heat is added.

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NGSS.MS-PS1-5

In a chemical reaction, the substances that are produced are called:

• Reactants

• Elements

• Products

• Compounds

Which of the following describes what happens to atoms during a chemical reaction?

• Atoms are created.

• Atoms are destroyed.

• Atoms are rearranged.

• Atoms are unchanged.

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NGSS.MS-PS1-5

The symbols on the left side of a chemical equation represent:

• Products

• Reactants

• Coefficients

• Formulas

What is a balanced chemical equation?

• When there is the same number of atoms of each element on both sides of the equation

• When only reactants are on the left side

• When the masses of reactants are higher than products

• When there is one product and one reactant

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NGSS.MS-PS1-5

Which of the following is an example of a compound?

• Na

• CO2

• O2

• H

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NGSS.MS-PS1-1

In a chemical reaction, what is represented by the arrow symbol?

• It shows that products are to the left of the arrow.

• It means 'yields' or 'produces.'

• It separates elements from compounds.

• It shows that mass will increase.

When vinegar (CH3COOH) reacts with baking soda (NaHCO3), the products are:

• Salt and water

• Sodium acetate, water, and carbon dioxide

• Only water

• Vinegar and salt

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NGSS.MS-PS1-5

NGSS.MS-PS1-2