When 105 grams of Calcium combine with fluorine gas to produce 200 grams of calcium fluoride. How much fluoride gas is needed to react with the 105 grams of calcium?
95 grams (Law of Conservation of Matter)
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10
A scientist examines a substance in a container. The substance does not have a shape or volume. What is sit?
Gas
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10
What state of matter has a definite shape but not a definite volume?
Liquid
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banana
Go to last place!
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gold
Win 50 points!
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shark
Other team loses 15 points!
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lifesaver
Give 10 points!
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15
Name that song and artist!
My Choice
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boom
Lose 50 points!
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gift
Win 15 points!
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rocket
Go to first place!
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baam
Lose 25 points!
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5
A banana changing colors on the kitchen counter. Chemical or Physical Change?
Chemical
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5
State the Law of Conservation of Matter
Matter can never be created or destroyed
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25
Describe the difference between a chemical change & a physical change?
A chemical change creates something new, but a physical change does not
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15
Name two examples of a pure substance
Random
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15
To change from a liquid to a solid energy must be... added,removed, remiain constant?
Added ( heat + energy)
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15
A sample of water vapor condenses to form liquid water. What change in the water molecules occur?
They moved closer together
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10
Salt water is a homogenous or heterogenous mixture?
Homogenous
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15
A puddle of water evaporates. Chemical or Physical Change?