Exploring Chemical Reactions Quiz

Which of the following is a sign that a chemical reaction is happening quickly?

• The mixture stays the same for a long time.

• Bubbles form rapidly.

• The temperature stays constant.

What do you observe when gas is produced in a reaction?

• The solution becomes solid.

• Bubbles appear.

• The color changes.

If a liquid changes from blue to red, what is this an example of?

• Gas production

• Color change

• Precipitate formation

Which method can be used to separate sand from water?

• Filtration

• Evaporation

• Dissolving

What is a precipitate?

• A gas that forms in a reaction

• A solid that forms in a liquid

• A liquid that evaporates

Which of the following indicates a fast reaction rate?

• The reaction takes hours to complete.

• The reaction produces heat quickly.

• The reaction does not produce any gas.

If a solution changes from clear to cloudy, what might be happening?

• A gas is being produced.

• A precipitate is forming.

• The solution is boiling.

What tool would you use to measure the pH of a liquid?

• A ruler

• A pH strip

• A magnifying glass

Which of the following is a method to separate salt from water?

• Filtration

• Evaporation

• Mixing

What does a color change in a reaction usually indicate?

• A physical change

• A chemical change

• No change