Chemistry Review

Front

Which of the following is a chemical reaction?

• Calcium chloride dissolves in water.
• A balloon pops.
• Soft-drink powder mixes with water and the water turns red.
• A nail is dropped in the yard and rusts.

Back

A nail is dropped in the yard and rusts.

Tags

NGSS.MS-PS1-2

Front

A student mixed two saltwater solutions and weighed 50 mL of each. Solution 1 had a mass of 64 g. Solution 2 had a mass of 48 g. Which is true?

Back

Solution 1 is more dense and more concentrated than Solution 2.

Front

A solution has 20 g salt and 100 mL water. What would make the solution half as concentrated?

Back

Add 100 mL water.

Front

Solution A has 10 g solid. Solution B has 12 g solid. Both have equal amounts of water. Which is true?

Back

A is less concentrated and less dense.

Front

Which is a substance made up of only one kind of atom?

Back

element

Front

Two spoons of solid are mixed in 50 mL water and the solid dissolves. The mass of one spoon of solid is 4 g. What is the mass of the solution?

Back

58 g

Tags

NGSS.MS-PS1-5

Front

Two spoons of solid are mixed in 50 mL water and the solid dissolves. The mass of one spoon of solid is 4 g. After the water evaporates, what will be the mass of the remaining solid?

Back

8 g

Tags

NGSS.MS-PS1-5

Front

A student dissolves 15 g of solid in 200 mL of water. What is true about the solution's mass?

Back

The solution's mass is greater than the mass of the water.

Tags

NGSS.MS-PS1-2

Front

Which of these makes both a mixture and a solution? salt and pepper, calcium chloride and salt, citric acid and water, water and sand

Back

citric acid and water

Front

Why do we heat water when adding sugar to make candy?

Back

So the solution is highly concentrated

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4