Copy Chemistry Unit Test Review

Front

Which of the following is a chemical change?

• boiling water at 100 C
• chopping up a piece of wood
• baking a cake
• dissolving sugar in water

Back

baking a cake

Front

Which of the following is a physical change?

• dissolving
• Rusty metal
• sour milk
• A compound

Back

dissolving

Front

Which of the following is a chemical change?

• using chalk
• water freezing
• slicing cheese
• digesting food

Back

digesting food

Front

The substances at the beginning of a chemical equation are called the ____

Back

reactants

Front

In the equation, 2Mg + O₂ ---> 2MgO, which are the reactants?

Back

Mg and O₂

Front

In a chemical reaction, everything to the right of the arrow is called ______________.

Back

Products

Front

Which of the following is evidence of a chemical reaction? Options: bubbles w/out added heat, water changing to ice, saltwater, paper being cut in half

Back

bubbles w/out added heat

Front

Which of the following models best demonstrates a balanced chemical equation? Options: F, G, H, J

Back

F

Front

What are Chemical Reactions?

Back

a process in which atoms rearrange to form new substances

Front

Which of the following is NOT evidence that a chemical reaction has occurred?

• produces light/heat
• production of a gas
• formation of a precipitate
• melting

Back

melting