WorksheetsPurity and Concentration Exercise
Total questions: 12
Worksheet time: 13mins
A sample of impure gold weighed 20 g and only contained 5 g of pure gold. The percentage of purity is... (% purity = mass of the substance in the sample/mass of the sample X 100)
0.25 %
25 %
4 %
400
A sample of impure mercury weighed 10 g and only contained 2 g of pure mercury. The percentage of purity is... (% purity = mass of the substance in the sample/mass of the sample X 100)
0.2 %
20 %
5 %
500
If I dissolve sugar in water, what is the solution?
water
sugar
sugary water
none of the above
Which of the following refers to the substance that is being dissolved in a solution?
solvent
solute
mixture
This is an example of a
Solution
Mixture
10 grams of sugar have been dissolved in 100 mL of water. The concentration of sugar in water is as follows:
(Equation Concentration of substance = mass of solute in grams/volume of solvent in liters or milliliters)
(a)
Calculate the concentration for a 20 g of food coloring dissolved in 10 mL of water in a beaker. (Equation Concentration of substance = mass of solute in grams / volume of solven in liters or mililiters)
0.5 g / mL
2 g / mL
200 g / mL
10 g / mL
30 g / mL
