Twister Day 2022

What is a reactant?

• The starting substance
• The ending substance

What is a product?

• The starting substance
• The ending substance

What is a precipitate?

• a change in color 
• a change in temperature
• a solid formed
• a gas formed

Burning is always a chemical reaction.

• True
• false

Which of the following is NOT a chemical reaction?

• burning a marshmallow in a campfire.
• a campfire
• acid rain turning a copper roof green.
• Dissolving red Koolaid in water.

A catalyst  

• is added to a reaction to make it slow down 
• breaks apart and is changed 
• provides an energetic short cut to the products 

What is the law of Conservation of Mass?

• A measure of how much mass is created or destroyed. 
• Mass can neither be created nor destroyed during a chemical reaction. 

Explain this graph

• A catalyst is used to speed up the reaction rate
• The catalyst provides a short cut to the products
• The red line shows how the catalyst saves energy 
• All of these choices

Which of the following is a decomposition reaction?

• MgCo3 --> MgO + CO2 
• SO3 + H2O --> H2SO4
• 2 Mg + O2 --> 2MgO 

Measure to the nearest milliliter.

• 73 mL
• 73.1 mL
• 76 mL
• 76.1 mL