8th Review Quiz (Unit 5)

Which of these is a sign that a chemical reaction has occurred? (Select all that apply!)

• Change in odor

• Formation of bubbles (gas)

• No change in temperature

• Change in color

Tags

NGSS.MS-PS1-2

How many hydrogen (H) atoms are in NH₃O?

Tags

NGSS.MS-PS1-1

How many oxygen (O) atoms are in 5 H₂O?

Tags

NGSS.MS-PS1-1

Which of the following best describes reactants in a chemical reaction?

• Substances produced in the reaction.

• The signs indicating a chemical reaction

• Substances that are always on the right side of the arrow

• Substances that start the chemical reaction.

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

A synthesis reaction is the opposite of a single replacement reaction.

• TRUE

• FALSE

Reactants and products can be either elements or compounds.

• True

• False

Tags

NGSS.MS-PS1-5

The following equation is already balanced: 4 Al + 3 O₂ → 2 Al₂O₃

• TRUE

• FALSE

Tags

NGSS.MS-PS1-5

In the chemical equation: A + B → C, what does 'C' represent?

• A reactant

• A product

• Both a reactant and a product

• Neither a reactant nor a product

A _____ reaction occurs when two or more reactants combine to form a single product.

• Synthesis

• Decomposition

• Single replacement

• Combustion

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

What type of reaction is represented by the following example: AB → A + B

• Synthesis

• Decomposition

• Single replacement

• Double replacement