Physical Change/ Chemical change
What happens to most materials when they are heated?
A. They dissolve.
B. They expand or change state.
C. They disappear.
D. Their temperature decreases.
B. They expand or change state.
In an experiment, a _____ is the variable that does not receive any special treatment or added action.
What is a control group?
Which of the following is a chemical change?
A. Melting butter
B. Tearing paper
C. Baking a cake
D. Freezing water
C. Baking a cake
In an experiment, a ______ is the thing that is being tested.
What is a variable?
A change that produces a new substance.
What is a chemical reaction?
When particles in a substance begin to speed up
What is heating?
How is a physical change different from a chemical change?
A. A physical change creates a new substance
B. A physical change cannot be reversed
C. A physical change only affects appearance or state
D. A physical change always involves heat
C. A physical change only affects appearance or state
Why do scientists conduct repeated experiments?
To test whether their results are accurate or reliable.
A change in which the physical properties of a substance are not affected
What is a physical change?
If you leave your bike in the rain for a long period of time, what will happen? What kind of change will occur?
The metal will rust. Rusting causes a chemical change.
This is an educated guess or prediction on the outcome of an experiment
What is a hypothesis?
The tiniest particles of matter
What are atoms?
A rotting apple is an example of _____________.
What is Chemical Change?
Burning wood undergoes a chemical change. Name two reasons why.
1. The burning wood produces smoke
2. The wood changes color and smell
3. A new product is formed (ash)
When scientists use their five senses to gather information about the natural world, this is called a ____.
What is an observation?
A combination of two or more substances
What is a mixture?