PS02A Pre-Quiz - Water and Solutions

Solid, liquid and gas are the three ________ of water on our planet.
1. colors
2. chemical compositions
3. formulas
4. states
Water changes into vapor or evaporates at 100ºC and the reverse, or ________ at 100ºC.
1. melts
2. condenses
3. freezes
4. flows
When water ________ it turns into ice.
1. evaporates
2. condenses
3. freezes
4. melts
When ice ________ , it turns into liquid.
1. melts
2. freezes
3. evaporates
4. condenses
The attraction of water molecules to each other forms a “skin” on the surface due to the ________ ________ forces.
1. surface tension
2. skin elastic
3. surface repulsion
4. surface solution
What doesn't a liquid need to be contained?
1. side
2. top
3. inside
4. bottom
Why does ice float?
1. less dense than water
2. same density as water
3. ice sinks
4. more dense than water
Why is water known as the “Universal Solvent”?
1. We needed a name for it.
2. molecules are always made up of two words.
3. So few things are dissolved in it.
4. So many things are dissolved in it.
Salt in water is a solution. Salt is the _________ there is more water than salt.
1. mixture
2. soluter
3. solvent
4. solute
Liquids take the shape of their ________ and need only sides and a bottom.
1. lid
2. container
3. top
4. solid
Ice, made from water, ________ in water because it is less dense than liquid water.
1. floats
2. sinks
3. sinks to the bottom
4. turns red
Slight electrical forces between water molecules make them ________ to other water molecules.
1. shift to the bottom
2. float
3. repelled
4. attracted
When one thing is dissolved into another a ________ is formed.
1. solution
2. solte
3. solute
4. solvent
Salt __________ the melting point of ice.
1. raises
2. neither raises nor lowers
3. lowers
4. doubles
What two things happen to water at 100º C?
1. evaporation and condensation
2. melting and freezing
3. boiling and freezing
4. boiling and melting
We either add heat energy or remove heat energy to change the ________ of water and ice.
1. color
2. state
3. coolness
4. direction
Water molecules are polar because the atoms make one side a bit electrically positive and another side the north pole.
1. true
2. false

PS02A Pre-Quiz - Water and Solutions

This will help you know where you are strong.