Mixtures and Solutions

A worker built a sidewalk and pressed some large salt particles into the concrete while it was still wet. When the concrete was dry, the worker washed the sidewalk with water. The picture below shows the sidewalk after it was washed. What most likely happened to the salt? (5.5C)

• It evaporated into a gas.

• It turned into concrete.

• It dissolved in the water.

• It turned into a solid.

Tags

NGSS.MS-PS1-2

When a powdered drink mix was added to water, the liquid turned orange. A student decided the taste was too strong, so he poured out half of the liquid and added more water. Which of the following most likely occurred when more water was added? (5.5C)

• The physical state changed.

• The orange color became lighter.

• The liquid had a sweeter taste.

• None of the above

A student adds 10 grams of four different powdered solids into four different beakers. The student then adds 100 mL of water to each beaker, stirs the mixtures, and allows them to sit for half an hour before recording observations. Which question is the student most likely trying to answer with this investigation? (5.5C)

• At what water temperature do the substances dissolve?

• How much water is needed to cause a substance to change state?

• What causes a substance to sink when put in water?

• Which substances dissolve in water?

Tags

NGSS.MS-PS1-2

Some people add sugar to their hot tea. Which property of the sugar remains the same when the sugar is in the tea solution? (5.5C)

• The taste of the sugar

• The size of the sugar crystals

• The color of the sugar

• The texture of the sugar

A beaker with 115 mL of solution has a temperature of 21 degrees Celsius. The solution contains 5 g of salt and 115 mL of water. Students added two ice cubes to the solution and stirred the solution with a stirring rod. Which properties of the solution changed as the ice cubes melted? (5.5C)

• The color and physical state of the solution

• The temperature, mass, and volume of the solution

• The volume, temperature, and mass of the salt in the solution

• The physical state and temperature of the solution

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5