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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20
Describe what happens when salt water evaporates
Salt is left behind
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thief
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15
True or False: During boiling, the bubbles are empty spaces only; they do not contain anything
False - bubbles have water vapor inside
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15
True or False: It is impossible to separate sugar and water when they form a solution
False. Remember dissolving is a physical/ reversible process!
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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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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
Complete the words: In a ____ change, a new substance is formed
Chemical change
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15
Bending a paper clip is an example of a physical or chemical change?
Physical change
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15
Which state of matter has the least moving particles?
Solid
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20
Does adding salt make water boil faster? In this experiment, the amount of salt used is which type of variable?
independent variable
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15
Cooking popcorn is an example of a physical or chemical change?
Chemical change
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15
When iron rusts, this is an example of a ____ change