Sylvia placed baking soda and vinegar in the bottom of 4 water bottles. It started fizzing and the balloon began to increase in size. What kind of change is happening in the photo?
chemical change
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15
Maggie is making pancakes. How do the pancakes change as they are cooked? Is this a physical change or a chemical change?
Chemical change
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15
Human-harnessed electricity is another name for _________ electricity.
current
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eraser
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fairy
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fairy
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thief
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25
Sammy's toast got stuck in the toaster. As he reached for a fork to get it out, him mom stopped and asked Sammy to unplug the toaster, first. Why?
Sammy would have received a shock to his hand when the metal fork touched the wires of the toaster.
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20
Did a physical change or a chemical change occur to the crayon in the picture?
physical change
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15
What part of the circuit is the battery?
power source
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15
If you take a sheet of paper and make a paper airplane, what kind of change takes place?
physical change
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20
True of False: Socks from the dryer sticking together is an example of human-harnessed electricity?
False. Socks sticking together is an example of static electricity.
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15
Which examples show human-harnessed electricity?
Examples 1 and 3
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thief
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seesaw
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shark
Other team loses 25 points!
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lifesaver
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20
How many wires would be needed to make this a closed circuit?
3
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15
Two clear substances are combined inside a plastic bag. The plastic bag is tightly sealed. The substances in the bag becomes warm. Is this a physical change or a chemical change?
Chemical change
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monster
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rocket
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fairy
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lifesaver
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15
If you put the North ends of two magnets together, what will happen?
The magnets will repel or move away from each other.
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15
What process occurs when ice absorbs heat energy from its surroundings?