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WorksheetsChemical Reaction Review
Total questions: 20
Worksheet time: 23mins
What is a physical change?
A change that affects one or more physical properties of a substance. Often can be reversed or undone.
A change that occurs when a substance is changed into one or more entirely new substances with different properties. Typically can not be reversed.
A change that affects physical properties of a substance, and changes the substance
What is a chemical change?
A change that occurs when a substance is changed into one or more entirely new substances with different properties. Typically can not be reversed.
A change that affects one or more physical properties of a substance. Often can be reversed or undone.
A change involving chemicals often found in a chemistry lab
Which of the following is NOT an example of a chemical change
Soured milk
Freezing water
Metal rusting
Burning gas or wood
What are the reactants in the following equation?
2H2 + O2 → 2H2O
H2O
2H2 + O2
2H2O
O2
Physical changes can often _____
be reversed or undone
lead to a new substance
not be reversed
Which of the following is NOT an example of a physical change
Melting ice
Bending a paper clip
Cutting your hair
Metal rusting
What is a chemical reaction?
A reaction that produces a new substance or substances.
A reaction that can always be undone
Which of these is a clue that a chemical change is happening?
Fizzing or bubbling
Color changes
Creation/loss of heat
All of these are clues that a chemical change is happening.
H2 + O → H2O
A substance produced during a chemical reaction
Product
Reactant
Properties
A chemical reaction or process that absorbs heat from the surroundings
Endothermic
Exothermic
A chemical reaction or process that releases heat.
Endothermic
Exothermic
True or False: In a complete chemical equation, there must be the same number of atoms of each element on the reactants and products side.
True
False
