Chemical Reaction Unit Test Review

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According to the Law of Conservation of Mass:

• Matter is always created in a chemical reaction.

• Matter is always destroyed in a chemical reaction.

• Matter is created and then destroyed in a chemical reaction.

• Matter is not created or destroyed in a chemical reaction.

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What is a reactant?

• A volatile chemical

• A dangerous substance

• The substance you start with before a chemical reaction

• The substances that are formed by a chemical reaction

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NGSS.MS-PS1-1

What is a product?

• A volatile chemical

• A dangerous substance

• The substance you start with before a chemical reaction

• The substances that are formed by a chemical reaction

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What do chemical formulas tell us?

• The number of atoms in the world

• The number of atoms and elements a molecule contains

• The physical arrangement of atoms

• How many protons there are

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Which statement about the law of conservation of mass is false?

• The mass of the reactants must equal the mass of the products.

• All of the atoms on the reactants side of an equation are also on the product side.

• The reaction creates new types of atoms.

• Atoms are not lost, but are rearranged.

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NGSS.MS-PS1-5

What are the products of the chemical reaction pictured?

• CH₄ and CO₂
• CH₄ and O₂
• CO₂ and H₂O
• O₂ and H₂O

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NGSS.MS-PS1-5

In this image, what are the information in red is called the_______.

• Product
• Reactant
• Chemical Subscript
• Yield

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NGSS.MS-PS1-1

NGSS.MS-PS1-2

A chemical reaction that absorbs energy in the form of heat is described as

• endothermic
• exothermic
• combustion
• unbalanced

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NGSS.MS-PS3-4

A molecule is smaller than an atom.

• True
• False

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NGSS.MS-PS1-1