Heat expansion - when an iron bar is heated, it's length increases. Which picture (A or B) demonstrates heat expansion?
Picture A. Distance between particles increase when matter is heated
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25
When sweat evaporates, our body cools down. But why do we feel hotter in room with no fans or windows versus a room with fans or windows? (Note: temp is still the same)
If there is no air movement, sweat takes longer to evaporate! If sweat does not evaporate, we feel hot
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15
What is the name of the process that occurs when a liquid turns into a gas?
evaporation / boiling / vaporization
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seesaw
Swap points!
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shark
Other team loses 25 points!
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rocket
Go to first place!
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thief
Give points!
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monster
Reset all scores!
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rocket
Go to first place!
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fairy
Take points!
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lifesaver
Give 20 points!
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20
Thanos is studying the properties of the infinity gems and he recorded his observations in a table. Which infinity gems are soluble in water?
Space Gem and Reality Gem (those that disappear in water)
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15
Breaking a cookie is a physical or chemical change?
Physical change
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15
Dissolving salt into water is an example of a physical or chemical change?
Physical change
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thief
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fairy
Take points!
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rocket
Go to first place!
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thief
Give points!
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20
Does hair cream make our hair grow faster? Lisa experimented on herself. She measured her hair growth without hair cream, then she used hair cream and measured hair growth again. What's the indep. variable?
Using hair cream
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15
True or False: Evaporation happens at any temperature
True
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25
Give 2 variables to control in this experiment: Which brand of paper towel absorbs the most water?
Size of paper towel used; type of liquid for absorption; temp of liquid; surface where liquid is poured; how the paper towel is used
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15
When iron rusts, this is an example of a ____ change
chemical change
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20
The particles of a substance added to water looked like this. Did the substance dissolve? Why?
It's insoluble - the particles did not spread out to the other areass
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20
When dry ice sublimates, it turns from solid into gas. This is an example of a physical or chemical change?
Physical change! All changes in state are physical changes!
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20
Does colored water evaporate faster then clear water? In this experiment, the color of the water is what type of variable?