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20 questions
A student mixes yellow powder with water. Which observation would prove a CHEMICAL change occurred?
The powder DISSOLVED in the water
The water turned the COLOR yellow
The bag's TEMPERATURE changed
The STATE OF MATTER changed
Which of the following options provides evidence of a CHEMICAL change?
Wood is burned releasing ash and smoke
Rocks separate when soil is sifted
Water turns to ice when you put it in the freezer
Salt dissolves in water
Which of the following examples provides evidence of a PHYSICAL change?
Wood is burned and releases ash and smoke
Iron rusts over time
When mixed, baking soda and vinegar form gas bubbles
A piece of paper changes shape when you rip it up
A white tablet is dropped into water. The water becomes cloudy and bubbles are produced. What type of change has occurred?
Physical change
Chemical change
No change
Which observations prove a chemical change has occurred?
Dissolving and expected color change
Mixing and dissolving
State of matter change and boiling water bubbles
Unexpected color change and temperature change
When mixing milk and vinegar, a white, chunky, solid substance is formed. What has occurred?
Physical change: state of matter
Chemical change: production of a solid
Physical change: freezing
Chemical change: rust
When iron is exposed to air over a long period of time, it forms rust. This is an example of what?
A new substance forming
Color change: no new substance
Shape change: no new substance
Burning: a new substance
A physical change...
Changes the physical properties of an object, but does not create a new substance.
Creates a new substance and cannot be undone.
A chemical change...
Changes the physical properties of an object, but does not create a new substance.
Creates a new substance and cannot be undone.
Is this an example of a physical or chemical change?
Physical
Chemical
Is this an example of a physical or chemical change?
Physical
Chemical
Is this an example of a physical or chemical change?
Physical
Chemical
Is this an example of a physical or chemical change?
Physical
Chemical
Is this an example of a physical or chemical change?
Physical
Chemical
Is this an example of a physical or chemical change?
Physical
Chemical
Is this an example of a physical or chemical change?
Physical
Chemical
Melting a chocolate bar is a...
Physical change
Chemical change
Which of the following is NOT an example of a physical change?
Crumpling paper
Sharpening a pencil
Clothes shrinking in the dryer
Milk turning sour
A change in which NEW substances are formed.
Chemical change
Physical change
Which of the following is NOT an example of chemical change?
Milk turning sour
Burning wood
Breaking a pencil
Metal turning rusty
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