Mixtures and Solutions

A student makes a flourless cake. He measures out these ingredients. 110 g of chocolate (C) 95 g of butter (B) 160 g sugar (S) 45 g (2) eggs (E) Which is the relationship between the mass of the ingredients and the mass of the mixture before baking?

• 
• 
• 
• 

Three solutions are made with the same solid material (see chart above) and the same amount of water. Which solution is the least concentrated?

• Solution A

• Solution B

• Solution C

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?

• 
• You can’t tell from the information given.

• 
• 

A student adds 5 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 8 g. What is the mass of the solution?

• 108 g

• 140 g

• 105 g

• 5 g

A student mixes a colorless liquid and a blue solid. When all of the solid dissolves, the solution is blue. 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 blue.

• You could still see through the liquid.

• The solid is on the bottom of the cup.

• The blue solid dissolved.

A student adds 5 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 8 g. After the water evaporates, what is the mass of the solid remaining in the cup?

• 40g

• 8g

• 100g

• 13g

Three solutions are made with the same solid material (see chart above) and the same amount of water. Which solution is the most concentrated?

• Solution A

• Solution B

• Solution C

Solution M and Solution N 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?

• Solution M

• Solution N

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

The two cups on the balance each contain 50 mL of different solutions made with the same materials. (Notice that 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? (Mark the one best answer.)

• 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