A solution in which as much solute as possible has been dissolved
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A solution in which a small amount of solute has been dissolved
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A solution in which some solute has been dissolved
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A solution in which no solute has been dissolved
Q.2.
What effect does increasing the temperature have on the amount of solute that can be dissolved?
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More solute can be dissolved
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There is no difference in the amount of solute that can be dissolved
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Less solute can be dissolved
0%
More solvent is dissolved
Q.3.
The amount of substance that will dissolve in a solvent is affected by the temperature of the solvent. The effect of the change in temperature can be seen on a graph called a...
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solubility graph
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solvent curve
0%
solubility curve
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solvent graph
Q.4.
There is another factor that affects the solubility of gases apart from temperature. What is this other factor?
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Density
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Pressure
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Boiling point
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Molecular mass
Q.5.
As the temperature increases, the solubility of gases...
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increases
0%
decreases
0%
remains the same
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It is impossible to generalise
Q.6.
Pick the pair of compounds that are found in 'hard' water.
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Sodium compounds and magnesium compounds
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Calcium compounds and manganese compounds
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Caesium compounds and magnesium compounds
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Calcium compounds and magnesium compounds
Q.7.
Pick the equation that shows the effect of heat on the dissolved calcium compounds in hard water.
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Ca2+ + 2HCO3- → CaCO3 + H2O + CO
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Ca2+ + 2HCO3- → CaCO + H2O + CO2
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Ca2+ + 2HCO3- → CaCO3 + H2O + CO2
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Ca2+ + HCO3- → CaCO3 + H2O + CO2
Q.8.
What unwanted material can hard water produce in heating appliances, e.g. kettles and irons?
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Scum
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Scale
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Scurry
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Soap
Q.9.
Soft water does not contain the dissolved substances that hard water does. It is possible to soften hard water by removing the offending ions. Pick the two methods for softening water.
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Using baking soda and using an ion-exchange column
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Using water soda and using an element-exchange column
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Using washing soda and using an ion-exchange column
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Using washing powder and using an ion-exchange column
Q.10.
There is a possible health advantage to drinking hard water. What is it?
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It could reduce the incidence of obesity
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It could reduce the incidence of strokes
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It could reduce the incidence of diabetes
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It could reduce the incidence of heart disease
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