Potpourrii
When water vapor cools, it changes to liquid water. This change from a gas to a liquid is called:
Condensation
In which state of matter do water molecules move the least?
Solid
The temperature at which ice melts is _______ ºC.
Zero
True or False. A change in the state of matter of water can be reversed.
True
Describe what happens when you stir salt and water in a cup.
The salt dissolves into the water. Even though you cannot see it, it is still there.
Adding heat can cause water to change to a gas. This change from a liquid to a gas is called:
Evaporation
In which state of matter do water molecules have a fixed volume and a fixed shape?
Solid and/or Ice
The temperature at which water boils is ____ºC.
100ºC
True or False. Water must boil to evaporate.
False.
Describe how to separate a salt water solution.
Evaporate the water by boiling. This will leave salt in the pan.
If enough heat is added to ice, it will change to a ___.
Liquid
Which state of matter does water have a fixed volume, but not a fixed shape?
Liquid
The temperature at which water freezes is ____ºC.
Zero
True or False. If a substance dissolves, it disappears and is no longer part of the solution.
False
Describe how to separate a mixture of sand and pebbles.
You can use one of the following: screen, sieve, colander, or funnel.
Mixture or Solution: Chex Mix is an example of a ___.
Mixture
Water changing states is an example of a _______ change.
Physical
When heat is added to liquid water it changes to a gas called ________________.
Water vapor
Mixture or solution: Fruit salad is an example of a ___.
Mixture
Describe how to separate a mixture of iron filings and sand.
Use a magnet to pick up the iron filings.
How can you change liquid water to water vapor?
By adding heat
If enough heat is added to ice, it changes to a liquid. The change from a solid to a liquid is called _____.
Meltin
A ______ is a mixture in which one substance dissolves into another.
Solution
Mixture or solution: Lemonade is an example of a ___.
Soution
Describe how to separate a mixture of salt and pepper.
Add water. The salt will sink and dissolve and the pepper will float on top.