Chemistry Topic 4 Chemical Reactions Quiz

Which of the following examples shows that a chemical reaction has occurred? 

• A rock breaks into smaller pieces when it is struck with a hammer.
• Rust forms on a hammer that has been left outside to long. 
• A cup of water turns pink when a few drops of red food coloring are added. 
• A solid is formed when heat is removed from a sample of water. 

Tags

NGSS.MS-PS1-2

In an exothermic reaction, heat is ...

• taken in
• given out

Tags

NGSS.HS-PS1-4

Which of the following is an example of an endothermic reaction?

• lighting a sparkler

• breaking a cold pack

• cellular respiration

• baking bread

One evidence of a chemical change is the formation of a precipitate. A precipitate is formed when

• Two liquids react and a gas is produced

• A solid dissolves in a liquid

• One liquid dissolves in another

• Two liquids react and a solid is formed

Which of the following is an example that includes evidence of a chemical reaction?

• A sample of zinc is placed in water and it settles to the bottom
• A solid block of ice is heated and it completely melts into a liquid. 
• Sugar that is burned gives off an odor and turns brown and then black.
• A tomato is placed into a blender and chopped up into smaller pieces.

Tags

NGSS.MS-PS1-2

Which of the following is located on the left side of a chemical reaction?

• reactants

• products

Grinding a seltzer tablet into powder increases the rate of reaction due to increased

• concentration
• surface area
• temperature
• reactants

Tags

NGSS.HS-PS1-5

Why does a higher concentration increase the rate of reaction?

• it increases the amount of reactants

• it lowers the activation energy

• it increases the energy of particle collisions

• it increases the frequency of particle collisions

Tags

NGSS.HS-PS1-5

Evidence of a chemical reactions is anything that shows - 

• a new substance has formed
• a solid dissolved in a liquid
• interaction between 2 gases
• a change in the state of matter

Tags

NGSS.HS-PS1-7

Which of the following slows down the rate of a chemical reaction?

• Place the reactants in hot water
• Place the products in ice bath
• Place the reactants in a ice bath
• Keep stirring the reactants with a stirring rod

Tags

NGSS.HS-PS1-5