Investigation 3

Investigation 3

Concentration

Concentration

• Concentration is the amount of solid material dissolved in a unit of water.

• Solutions with a lot of solid material dissolved in water are more concentrated than solutions with less solid material in the same amount of water.

• A concentrated solution can be diluted by adding water.

Multiple Choice

Which solution is most concentrated?

• Solution A

• Solution B

• Solution C

• Solution D

Multiple Choice

To dilute a solution you would

• add more solute

• add more water

Salt Concentration

• When equal volumes of two salt solutions are weighed, the heavier one is more concentrated solution.

• More concentrated solutions will weigh more.

Multiple Choice

Which solution is more concentrated?

• Solution D

• Solution A

Multiple Choice

If you use equal volumes, you can compare the concentrations of transparent solutions made with the same ingredients by comparing their _______.

• love

• color

• mass

• smell

Density

• Density is mass per unit volume

• Objects that are more dense than water will sink.

• Objects that are less dense than water will float.

Multiple Choice

Objects that are more dense than water will

• float

• sink

Multiple Choice

Objects that are less dense than water will

• sink

• float

Salt water concentration and density

• The greater the concentration of a salt solution, the greater is its density.

• Less dense liquids and solid objects float on more dense solutions.

Multiple Choice

Which solution is most concentrated?

• The green solution.

• The red solution.

• The blue solution.

Multiple Choice

Which solution is most dense?

• The blue solution.

• The red solution.

• The green solution.

Open Ended

Open Response Question: Ocean water (salt water) and River water (water with very little salt) mix near the mouth of a river. When the water from the two sources meet, the river water layers on top of the ocean water. Explain why this happens. (Hint: think about the different properties of solutions you have been studying) You must use the words CONCENTRATION, SOLUTION and DENSE (DENSITY) in your answer.