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14 Cards in this Set
- Front
- Back
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Sources used to produce electricity
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wind, water, sun
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Name some substances that will dissolve in water.
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salt, sugar
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Name the substance that is called a "universal substance" because it can dissolve many other substances.
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water
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What increases the rate of a chemical reaction in a solution?
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temperature
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Name two things that happen when table salt is added to water and heated.
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salt dissolves, salt increases the boiling point of the water
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What causes a rolling object to slow down?
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unbalanced forces- friction
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If an object is traveling at a constant speed in a straight line, is it accelerating?
Are the forces acting on the object balanced or unbalanced? |
No, the object is not accelerating.
The forces are balanced. |
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A satellite is pulled into a constant curved path by the force of Earth's gravity.
True or False |
True
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Which of these does the eye covert into nerve impulses that allow a person to see objects?
color pigments, visible light waves, ultraviolet radiation, vibrations in the air |
visible light waves
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What factor determines the color that an object appears when it is viewed?
physical structure of the object the amount of energy the object has wavelength of the light absorbed wavelength of the light reflected or emitted by the object |
the wavelength of the light reflected or emitted by the object
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When cells use glucose for energy, some of the energy in the glucose changed into what kind of energy?
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heat energy
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What is the freezing and boiling point in degrees celsius?
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Freezing point = 0
Boiling point = 100 |
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How much energy does the earth receive from the sun?
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A small fraction
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Which form of energy produced by the sun can be harmful to humans?
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ultraviolet radiation
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