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How would you separate a mixture of salt and water?

• straining

• filtering

• evaporation

• using a magnet

The oil in this water is . . .

• soluble

• insoluble

Tags

NGSS.MS-PS1-2

The smaller the particle size the faster the rate of dissolution (rate of dissolving).

• True

• False

Stirring the solution increases the rate of dissolution (rate of dissolving).

• True

• False

Which dissolves faster?

• a substance in room temperature water

• a substance in hot water

• a substance in cold water

• temperature does not affect dissolving time

Tags

NGSS.MS-PS1-4

A boy emptied out a piggy bank and got a mixture of all different kinds of coins. He wants to separate them by kind. What is the best property to use to separate the mixture into the different kids of coins?

• color

• shape

• size

• magnetic attraction

Tags

NGSS.5-PS1-3

Kym has set up an experiment with four beakers, each filled with 100 mL of water at four different temperatures. She plans to time how long it takes for 1 tsp of sugar to dissolve at each temperature. To determine if there is a trend, she will add the sugar to each beaker of water without stirring, wait for it to dissolve, then plot her results on a graph. Which of the following graphs would most likely show the results of Kym’s experiment?

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Tags

NGSS.MS-PS1-2

Salim is studying how the rate of stirring affects the time it takes for salt to dissolve. He added 1 g of salt to each of four beakers filled with water, stirred the water at different speeds, and recorded how long it took for all the salt to dissolve each time. Salim’s results are shown in the following table. Which conclusion could Salim draw based on his results?

• Salt will not dissolve in water unless the water is stirred.

• Stirring a solution of water increases the rate at which a salt dissolves.

• Stirring a solution of water decreases the rate at which a salt dissolves.

• Stirring a solution of water has no effect on the rate at which a salt dissolves.

Tags

NGSS.MS-PS1-2

Four students are dissolving sugar in water to perform an experiment. Each student dissolved 1 tsp of sugar in 1 cup of hot water and stirred the water a different number of times. The students recorded how long it took for the sugar to dissolve in each cup. The results are shown in the following table.

Which of the following happened as the number of stirs increased?

• The speed of dissolving increased.

• The speed of dissolving decreased.

• The amount of sugar dissolved increased.

• The amount of sugar dissolved decreased.

Tags

NGSS.MS-PS1-2

In a science experiment, Kayo added 1 tbsp of sugar to a flask filled with water. The diagram below shows how Kayo’s experiment looked.

Which could Kayo do to speed up the dissolving process?

• Add more sugar to the flask.

• Place the flask in an ice bath.

• Shake the flask back and forth.

• Remove some water from the flask.