1.01 & 1.02 Types of Chemical Reactions

Front

Which of the following is an example of a chemical change?

• melting a stick of butter
• dissolving salt in water
• using magnesium to displace hydrogen gas from water

Back

using magnesium to displace hydrogen gas from water

Front

In the chemical equation CH₄ + 2 O₂ → CO₂ + 2 H₂O, CH₄ is a

Back

reactant

Front

In the equation 4 Fe+3 O₂ → 2 Fe₂O₃ , 3 O₂ is a

Back

reactant

Front

Example of a physical change to matter: rusting, digestion, freezing

Back

freezing

Front

What are ALL of the physical changes when you cut down a tree, chop it into small pieces, and burn the pieces?

Back

cutting down the tree and chopping the wood into small pieces

Front

What are ALL of the chemical changes when you burn wood from a tree?

Back

burning the wood

Front

Photosynthesis is a chemical reaction that involves the production of glucose (sugar) from carbon dioxide and water in the presence of sunlight. Photosynthesis is what kind of reaction?

Back

endothermic

Front

During an endothermic reaction, what happens to energy in relation to the surroundings?

Back

absorbed from

Front

During an exothermic reaction, what happens to energy in relation to the surroundings?

Back

released to

Front

In a cold pack, which type of reaction draws heat from the surroundings?

Back

endothermic