Which of the following is the best example of a mixture?

• 1. A pan of pancake batter

• 1. A bowl of trail mix

• 1. A glass of soda

• 1. A carton of milk

A solution is a special kind of mixture. Some substances can dissolve in water to form a solution; some substances cannot. Which of the following will dissolve in water?

• 1. Salt

• 1. Vegetable oil

• 1. Sand

• 1. A penny

A mixture of sand and iron filings is in a bowl. If both substances keep the same physical properties after being mixed together, how could the mixture be separated?

• 1. Stir in water

• 1. Pour through a sieve

• 1. Separate with tweezers

• 1. Use a magnet

Some materials, when they are mixed with water, will change properties and dissolve. When you stir white grains of sugar into water, you can no longer see the grains of sugar. How can you tell that the sugar is still there?

• 1. The water will taste cold.

• 1. You will start to see the grains of sugar again if you wait long enough.

• 1. The water will taste sweet like sugar.

• 1. The water will turn white like the grains of sugar.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Sand and water both keep their same physical properties when mixed together. How could you separate the two substances, keeping their physical properties in mind?

• 1. Shake the mixture until the sand dissolves.

• 1. Use a magnet.

• 1. Use tweezers.

• 1. Use a filter.