Quarter 2 - Science Review

Which of the following provides evidence of a mixture that results in a change of properties?

• a copper penny is mixed with rainwater and turns green

• a large sugar cube is mixed with a spoon and becomes tiny sugar particles

• apple juice is mixed with ice and freezes

• a candle is mixed with heat and melts

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NGSS.MS-PS1-2

Owen and Eli will mix sand and water together to see if a new substance forms. Which of the following describes the best procedure for this lab?

• Mix the sand and water together and observe whether the sand dissolves in the water

• Observe the properties of the sand and water separately, mix the sand and water together, and observe the properties of the mixture

• Mix the sand and water together and measure how long it takes for the sand to dry

• Observe the texture of the sand and water separately, mix the sand and water together, separate the sand and water, and observe the texture of the sand and water again

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NGSS.MS-PS1-2

Asher mixes a white powder and a clear liquid in a sealed plastic bag. Some powder dissolves into the liquid and forms a solution. After a few moments, the sides of the bag begin to expand. He opens the bag and waits for the liquid solution to evaporate. Then, he observes the dried powder that remains from the solution. What observations does he notice? Select all that apply.

• Some of its properties have changed.

• The amount of dried powder is the same as before.

• The dried powder is now wet, but no other change occurred.

• A gas was produced.

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A white powder is mixed with a blue liquid. Which of the following most likely occurred?

• The liquid was blue

• The powder dissolved in the liquid

• The mixture of the white powder and blue liquid turned a new color: yellow

• The powder did not dissolve in the liquid and just settled to the bottom

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NGSS.MS-PS1-2

Addie and Abby added a tablespoon of baking soda to 25mL of vinegar, which formed a new substance when they were mixed. What evidence proves this?

• The liquid is still clear but there is less of it

• The bubbles show that a gas forms

• The baking soda gets wet after it is added to the vinegar

• The baking soda dissolves after it is added to the vinegar

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NGSS.MS-PS1-2

Which factor would not affect the solubility of sugar in water?

• Grind the sugar to make it finer

• Stir the water and sugar

• Heat the water and sugar

• Add salt to the water

Imagine that you performed an experiment in which you dissolved different samples of sugar (sugar cubes, extra fine sugar and regular table sugar) into water samples to compare how long they took to dissolve. Which factor would be least important to the design of this experiment?

• The water samples must all be at the same temperature.

• The sugar samples must all contain only sugar and water.

• All the samples must be tested at exactly the same time of day.

• The same amount of sugar must be used in each sample.

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NGSS.MS-PS1-2

Which process or processes affect the speed of dissolving?

• Particle size, temperature and stirring

• Particle size only

• Particle size and stirring only

• Stirring only

Which would NOT increase the rate at which a sugar cube dissolves?

• Reducing the amount of solvent

• Crushing the sugar cube

• Stirring the solution

• Heating the solvent

You can make a solute dissolve more quickly in a solvent by (sugar to coffee)

• adding more solute

• adding ice

• adding heat to the solvent

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NGSS.MS-PS1-4