Unit 9 Test: Reactions

What are the substances on the left side of a chemical equation that are being changed?

• Reactants

• Products

• Coefficients

• Subscripts

Tags

NGSS.MS-PS1-5

In a(n) _____ reaction, energy is absorbed as heat from the surroundings

• Exothermic

• Exergonic

• Endothermic

• Endergonic

Tags

NGSS.HS-PS1-4

In a chemical equation, _____ are changed to balance the reaction.

• Subscripts

• Coefficients

• Reactants

• Products

Which of the following means dissolved in water?

• Solid (s)

• Liquid (l)

• Gas (g)

• Aqueous (aq)

In a balanced equation, the total mass of the reactants must equal the total mass of the products, according to the...

• Law of Conservation of Energy

• Law of Conservation of Mass

• Law of Conservation of Equations

• Law of Conservation of Momentum

Tags

NGSS.MS-PS1-5

Balance: ___H2O 🡪 ___H2 + ___O2

• 1, 2, 2

• 2, 1, 1

• 2, 2, 1

• Already balanced

Tags

NGSS.MS-PS1-5

Balance: ___Pb(OH)2 + ___HCl 🡪 ___H2O + ___PbCl2

• 2, 4, 4, 2

• 2, 2, 2, 1

• 1, 2, 1, 1

• 1, 2, 2, 1

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The process of digestion, or the breakdown of the food you eat, is most likely which type of reaction?

• Decomposition

• Combustion

• Synthesis

• Construction

Tags

NGSS.MS-PS1-5

This type of reaction will result when something is burned.

• Decomposition

• Synthesis

• Combustion

• Construction

Tags

NGSS.MS-PS1-5

Which of the following will NOT speed up a chemical reaction?

• Higher temperature

• Smaller surface area

• Higher pressure

• Presence of a catalyst