Posttest Mixtures and Solutions

Which pair of graphs best represents the mass of the ingredients and the mass of the cake mixture in the bowl?

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Tags

NGSS.MS-PS1-2

A student mixes a colorless liquid and a pink solid. When all the of the solid dissolves, the solution is pink. Ten minutes later, a solid settles on the bottom of the cup. What is the best evidence that a chemical reaction occurred?

• The solution turned pink.

• The pink solid dissolved.

• The solid on the bottom of the cup.

• You could still see through the liquid.

Tags

NGSS.MS-PS1-2

Three solutions are made with the same solid material and the same amount of water.

Which solution is the least concentrated?

Solution A is made with 8 g of solid.

Solution B is made with 6 g of solid.

Solution C is made with 4 g of solid.

Three solutions are made with the same solid material and the same amount of water.

Solution A is made with 8 g. of solid.

Solution B is made with 6 g. of solid.

Solution C is made with 4 g. of solid.

Which solution is the most concentrated?

A student makes two citric acid solutions, P and Q. He puts 60 mL of water in each cup. He puts 10 spoons of citric acid in cup P and 12 spoons in cup Q. Both solutions are saturated. Which picture below shows what the balance would look like if the student filtered the solutions, then put 50 mL of each in the cups on the balance?

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Tags

NGSS.MS-PS1-2

A student adds 3 spoons of solid to 100 mL of water. The solution is clear, with nothing on the bottom of the cup. One spoon of the solid has a mass of 5 g. What is the mass of the solution?

• 5 g

• 15 g

• 105 g

• 115 g

Solution R and Solution S are both made with water and the same solid. You measure equal amounts into two separate cups and weigh each solution.

Which solution is more concentrated? ​ ​ (a)  

Tags

NGSS.MS-PS1-2

Students mix baking soda and white vinegar. The mixture begins to bubble, and later there is a clear liquid left in the cup. Which of the following describes the bubbles?

• A product of a chemical reaction

• A component of the mixture

• A solute of a solution

• A reactant of a chemical reaction

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following is a chemical reaction?

• Bend a glow light stick to mix materials and produce heat and light.

• Citric acid dissolves in water and the solution remains clear.

• A soft-drink bottle is opened and the liquid starts bubbling.

• Soft drink powder mixes with water, and the water turns purple.

Tags

NGSS.MS-PS1-2

The two cups on the balance each contain 50 mL of different solutions made with the same materials. (Notice the balance is not level.)

Cup A contains a solution made by mixing 2 spoons of solid in 100 mL of water.

Which solution listed below must be in Cup B?

• 5 spoons of solid, 250 mL of water

• 3 spoons of solid, 600 mL of water

• 8 spoons of solid, 400 mL of water

• 6 spoons of solid, 300 mL of water

Tags

NGSS.MS-PS1-2