Unit 6 (Chemical Reactions) Review

What are the reactants in this chemical reaction?

• 
• 
• 
• 

Answer explanation

Reactants are found on the left side of a chemical reaction.

Tags

NGSS.HS-PS1-7

What are the products in this chemical reaction?

• 
• 
• 
• 

Answer explanation

The products are on the right side of the chemical reaction.

Which part of this reaction means "makes" or "produces" or "yields"?

• 
• 
• 
• None of the these

What type of reaction is this?

• Single replacement

• Double replacement

• Combination/

  Synthesis

• Decomposition

Answer explanation

Combination reactions involve putting two atoms/molecules/compounds together to form something larger.

What is the coefficient of K in the balanced version of this chemical reaction?

• 1

• 2

• 3

• 4

Answer explanation

The correct balancing for this reaction is 2,1,2.

What type of reaction is this?

• Single Replacement

• Combustion

• Decomposition

• Double Replacement

Answer explanation

In double replacement, two atoms/ions are switching partners, like in country-swing dancing (where they switch partners in the middle of the dance).

What type of reaction is this?

• Decomposition

• Single Replacement

• Double Replacement

• Combustion

Burning fossil fuels is an example of an ______________ reaction

• exothermic

• endothermic

Answer explanation

Burning fuels releases energy making the environment hotter.

Tags

NGSS.HS-PS1-4

Which kind of reaction leads to climate change?

• Combustion

• Single Replacement

• Double Replacement

• Combination/

  Synthesis

Answer explanation

Combustion produces carbon dioxide which traps heat like a greenhouse does and leads to climate change.

Tags

NGSS.HS-ESS3-5

Where are the reactants in this graph?

• A

• B

• C

• D