1) Shown are two solutions containing water and blue food dye. Which solution is more dilute? a) The solution on the left. b) The solution on the right. c) Both solutions have the same concentration. 2) Shown are two solutions containing water and blue food dye. Which solution is denser than the other? a) The solution on the left. b) The solution on the right. c) Both solutions have the same density. 3) Arrange the solutions in order from most dense to least dense. a) 1, 2, 3, 4, 5 b) 5, 4, 3, 2, 1 c) 4, 1, 3, 2, 5 d) 5, 2, 3, 1, 4 e) 2, 3, 4, 5, 1 f) 5, 3, 2, 1, 4 4) Each of the solutions contain the same solute and solvent. Which solution is the most concentrated? a) 1 b) 2 c) 3 d) 4 e) 5 5) What is the independent variable in an experiment? a) The variable that is measured at the end of the experiment. b) The variable that is changed on purpose. c) The variable that remains constant throughout the experiment. d) The variable that is easy to identify. 6) In this experiment, each of the solutions contain the same solute and solvent but have different concentrations. What is the independent variable of the investigation? a) The density of each solution b) The concentration of each solution c) The colour of each solution d) The volume of each solution 7) What is the dependent variable in an experiment? a) The variable that is measured at the end of the experiment. b) The variable that is changed on purpose. c) The variable that remains constant throughout the experiment. d) The variable that is easy to identify. 8) Each of the solutions contain the same solute and solvent but have different concentrations. What is the dependent variable of the investigation? a) The density of each solution b) The concentration of each solution c) The colour of each solution d) The volume of each solution 9) What is a controlled variable in an experiment? a) The variable that is measured at the end of the experiment. b) The variable that is changed on purpose. c) The variable that remains constant throughout the experiment. d) The variable that is easy to identify. 10) Each of the solutions contain the same solute and solvent but have different concentrations. What is one of the controlled variables in the investigation? a) The density of each solution b) The concentration of each solution c) The colour of each solution d) The volume of each solution 11) Which box has a higher density? a) The box on the left. b) The box on the right. c) Both boxes have the same density. 12) What causes the rock to sink to the bottom on the ocean? a) The rock's density is less than the water's density b) The rock's density is more than the water's density c) The rock's density is same as the water's density d) The rock's density is zero 13) When two liquids with different densities, like oil and water, are added together, what will happen? a) The two liquids form a solid b) The two liquids mix together evenly c) The two liquids exchange densities d) The two liquids separate according to their densities 14) Oil spills in the ocean are easier to remove than other spills because: a) Oil is less dense than water, so the oil will sink to the bottom of the ocean b) Water is less dense than oil, so the oil will sink to the bottom of the ocean c) Water is less dense than oil, so the oil will float on top of the water and can be scooped up d) Oil is less dense than water, so the oil will float on top of the water and can be scooped up 15) What causes the balloon to float on top of the water? a) The ballon's density is less than the water's density b) The balloon's density is more than the water's density c) The balloon's density is same as the water's density d) The balloon's density is zero

Year 7 Science - Mixtures Unit: Revision

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