Science Unit 2: Chemical Reactions

The rate of a chemical reaction is NOT affected by which of the following:

• temperature
• concentration
• particle size (surface area)
• All of these affect reaction rates

Tags

NGSS.HS-PS1-5

The rate of a reaction increases as temperature__________________.

• Decreases
• Increases
• Stays the Same

Tags

NGSS.HS-PS1-5

Products will form faster if____________

• the particle size of the reactants are larger.
• temperature is decreased.
• concentration of the reactants are increased.
• the reaction is not stirred.

Tags

NGSS.HS-PS1-5

Smaller particle size allows for a _________ surface area to be exposed for the reaction.

• larger
• smaller

The ___________ the surface area of the reactants, the faster the reaction rate.

• larger 
• smaller

Usually lowering the temperature will slow down a reaction.

• false
• true

Tags

NGSS.HS-PS1-5

Increasing the concentration of the reactants will slow down the reaction.

• false 
• true

Tags

NGSS.HS-PS1-5

You observe bubbles after adding metal to a solution. Do you assume a chemical reaction took place?

• Yes
• No

Tags

NGSS.HS-PS1-2

A solution is heated and bubbles form. Do you assume a chemical reaction took place?

• Yes
• No

Tags

NGSS.MS-PS1-2

Two clear and colorless solutions are combined within a test tube. The result is very cloudy. Do you assume a chemical reaction took place?

• Yes
• No

Tags

NGSS.MS-PS1-2