Unit 5 WarmUp

​Unit 5:
Chemical
Reactions

By Christina Wood

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Multiple Choice

What evidence showed that a chemical reaction occurred in the first three reactions?

• Light was produced
  

• Gas bubbles formed
  

• A solid formed

• The water evaporated

Multiple Choice

Which observation is evidence that atoms were rearranged in all four reactions?

• New substances were formed

• The drops were small

• The reactions were colorful

• The solutions were mixed

Multiple Choice

The solids formed in reactions 1–3 are best described as:

• Solvents
  

• Catalysts
  

• Precipitates
  

• Reactants

Multiple Choice

What type of visible evidence was unique to the fourth reaction? [Luminol solution]

• Formation of a solid
  

• Production of light
  

• Color change only

• Temperature increase

​Simplified Chemical Reaction

Multiple Choice

Which claim is best supported by the video?

• All chemical reactions look the same
  

• Chemical reactions can release energy in different ways
  

• Precipitates always form in water

• Light means a reaction is dangerous