7H:Solutions

solids which dissolve are called
1. soluble
2. insoluble
3. particles
4. solutions
when a solid dissolves in a liquid we get a
1. solution
2. solvent
3. solute
4. compound
what do we call the liquid that we dissolve a solid into?
1. solvent
2. solution
3. solute
4. compound
what do we call the solid that we dissolve into a liquid?
1. solute
2. solvent
3. solution
4. compound
pure water freezes at zero degrees Celsius. If impure, the freezing point is
1. lower
2. higher
3. the same
4. zero degrees Fahrenheit
usually, pure water boils at 100 degrees Celsius. If impure, the boiling point is
1. higher
2. lower
3. the same
4. halved
the boiling point of water depends on the air pressure around it. This means that
1. up a mountain, water boils at a lower temperature
2. up a mountain, water boils at a higher temperature
3. up a mountain, water boils at the same temperature
4. you get a better cup of tea at the summit of Everest
we can get salt from sea water by
1. evaporation
2. filtration
3. sieving
4. chromatography
we can get pure water from sea water by
1. distillation
2. filtration
3. sieving
4. chromatography
Which of these is true?
1. Roman soldiers were paid in salt. This is where the word "salary" comes from
2. salt raises the freezing point of water
3. salt lowers the boiling point of water
4. salt was used as a weapon in the First World War
Which of these is true?
1. mass of solution = mass of solute + mass of solvent
2. volume of solution = volume of solute + volume of solvent
3. solubility of solids in liquids decreases with temperature
4. solubility does not depend on temperature
in hot water, solids will dissolve
1. faster
2. slower
3. the same as in cold water
4. because the particles move slower
in hot water,
1. more solid will dissolve
2. less solid will dissolve
3. solids will not dissolve
4. the particles form stronger bonds
smaller sugar grains dissolve
1. faster, because there is more surface area
2. faster, because there is less surface area
3. slower, because there is more surface area
4. slower, because there is less surface area
diffusion is
1. particles mixing without being stirred
2. particles forming bonds
3. particles reacting
4. particles heavier than air
which of these are soluble in water?
1. sugar
2. sand
3. chalk
4. calcium carbonate
common salt is
1. sodium chloride
2. calcium chloride
3. sodium carbonate
4. calcium carbonate
Which of these is NOT true? Salt is used to make
1. antifreeze for cars
2. chlorine, to make bleach
3. sodium, for yellow street light bulbs
4. sodium hydroxide, to make soap
"dry cleaning"
1. uses solvents that do not contain water
2. does not use solvents
3. does not use liquids
4. uses aqueous solvents
distillation is
1. evaporating a liquid, then collecting the vapour and condensing it
2. condensing a liquid, then evaporating it
3. used to get salt from sea water
4. used in wine-making
separating dyes can be done using
1. chromatography
2. evaporation
3. filtration
4. distillation
a solution that cannot dissolve any more solid is called
1. saturated
2. subsaturated
3. unsaturated
4. polyunsaturated
a solubility curve shows
1. how much of a solid will dissolve at different temperatures
2. how much of a solid will dissolve
3. how much of a solution is present
4. how much solute is present
chromatography can tell us
1. whether a dye is a pure substance
2. the boiling point of a mixture
3. the concentration of solute
4. the substances in an insoluble mixture
"immiscible" means that
1. the substances won't mix with each other
2. the substances will mix with each other
3. the substances are soluble in water
4. the substances are soluble in ethanol
"emulsions" are
1. mixtures of liquids that don't mix well together
2. concentrated solutions
3. mixtures of solids
4. always water-based
gases dissolve best in
1. cold water
2. hot water
3. saturated solutions
4. liquids with large molecules
"dissolving" means that
1. the particles of solid mix with the particles of liquid
2. the particles of solid react with the particles of liquid
3. the particles of solid do not react with the particles of liquid
4. a blue solution is formed
"insoluble" means
1. does not dissolve in that solvent
2. dissolves well in that solvent
3. does not dissolve in any solvent
4. dissolves well in all solvents
"evaporation" means
1. changing from a liquid to a gas
2. changing from a solid to a gas
3. changing from a liquid to a solid
4. changing from a gas to a liquid