Physical and Chemical Changes Review
Presentation
•
Science, Chemistry
•
8th Grade
•
Practice Problem
•
Medium
Standards-aligned
Denice Manning
Used 440+ times
FREE Resource
5 Slides • 20 Questions
1
By Denice Manning
2
During a physical change, substances are NOT altered chemically.
They change from one state of matter to another.
Or, they separate or combine without breaking or making bonds.
Mixtures can be separated based on the physical properties of their components.
Making and separating mixtures are examples of a physical change.
What is a physical change?
3
The substance can change between the states of matter. For example, changing from a liquid to a solid or gas.
Change in state of matter
The size the substance is altered to make it bigger or smaller. The shape can also be altered. For example, cutting wood, ripping paper, squeezing a sponge.
Change in size or shape
Any change made can be easily undone allowing the substance to return to its original form. For example, an ice cube that melts can be refrozen.
Change is reversible
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During a chemical change, a substance combines in a chemical reaction to form one or more new substances with different chemical and physical properties.
A chemical reaction is a process by which the atoms of one or more substances are rearranged to form different substances
The rate of the chemical reaction is affected by temperature, pressure, the concentration of the reactants, and the state of matter.
What is a chemical change?
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Reactions may either produce or absorb heat.
If heat is absorbed this is an endothermic reaction.
If heat is released this is an exothermic reaction.
Change in energy
A reaction may produce a solid substance called a precipitate or release gas.
If gas is produced it can be seen as bubbles or effervescence (fizzing).
Production of a new substance
During a reaction, light is sometimes produced.
It can be released in a flash or slowly. For example the chemicals in a glow stick.
Production of light
6
Multiple Choice
Which is an example of a chemical change?
A chemical from skunks is added to odorless natural gas so that people can smell gas leaks.
If a scuba diver surfaces too quickly, the change in pressure causes dissolved nitrogen to form bubbles in the blood.
Over time, sand carried by the wind can grind rocks into natural arches and towers.
Bending a glow stick breaks a divider so that two chemicals can mix and produce light.
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Multiple Choice
Which is an example of a chemical change?
When water is boiled, bubbles of gas appear, rise to the surface, and escape
A small amount of red paint is mixed with yellow paint, creating orange paint
When hydrogen peroxide is put on a cut, oxygen bubbles away, leaving water behind
As water freezes, its molecules slow down and form ice crystals
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Multiple Choice
Which action causes a chemical change?
boiling water
crushing sugar cubes
sifting flour
cooking eggs
9
Multiple Choice
Texture, color, states of matter, flexibility, freezing & melting points
Chemical Property
Physical Property
Chemical Change
Physical Change
10
Multiple Choice
Which of the following is an example of a chemical property?
Melting
Bending a paper clip
Rusting
Boiling water
11
Multiple Choice
A physical change is .....
A change that doesn't change the identity of the substance
a change that makes something new
A chemical reaction
A change that is irreversible
12
Multiple Choice
What is a precipitate?
An insoluble reactant formed during a chemical reaction
An insoluble product formed during a chemical reaction
A soluble solvent in a saturated solution
A soluble solute in a saturated solution
13
Multiple Choice
A measure of how much mass is in a volume of matter
matter
density
weight
compund
14
Multiple Choice
What is an example of a physical change?
combustion
corrosion
recycling
reactivity
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Multiple Choice
Changing the size and shapes of pieces of wood would be a chemical change
True
False
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Multiple Choice
In a physical change, the makeup o matter is changed.
True
False
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Multiple Choice
Breaking up concrete is a physical change
True
False
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Multiple Choice
Combining hydrogen and oxygen to make water is a physical change.
True
False
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Multiple Choice
Which best describes a chemical change?
A chemical change requires no change in energy
A chemical change is easily reversed
In a chemical change, there is only a change in the state
In a chemical change, a new substance with different properties forms
20
Fill in the Blanks
Chewing food to break it down into smaller particles represents a
Type answer...
21
Fill in the Blanks
The changing of starch into sugars by enzymes in the digestive system represents a
Type answer...
22
Multiple Choice
Which best explains why blow drying your hair is a physical change?
No change in substance
No unexpected color change
No gas was given off
All of the above
23
Multiple Choice
Which best explains why leaving a piece of bread too long in a toaster leaving it black and the kitchen in smoke is a chemical change?
A new substance is formed
The change is reversible
No change occurs
The size changes
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Multiple Choice
This best explains why a chemical change is observed when silver spoons are very dull and have black spots.
A change of state occurs
Silver oxide is produced
This is a reversible change
Energy is absorbed
25
Multiple Choice
This best describes why a straight piece of wire is coiled to form a spring is a physical change.
No energy change occurs
A new substance is formed
The change is irreversible
An unexpected color change occurs
By Denice Manning
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