Mixtures and Solutions

Mrs. Velaj mixed 20 grams (g) of a white powder in 80 milliliters (mL) of warm water in a cup. The water stayed clear. Her son said, “Wow! That’s magic! The white powder is gone!”

What happened to the white powder when it mixed with the warm water?

• The white powder particles disappeared into the air.

• The white powder particles got stuck to the sides of the cup.

• The white powder particles break down into smaller particles and dissolve into the water.

• The white powder particles expand into larger particles and disappear into the water.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Mrs. Velaj mixed 20 grams (g) of a white powder in 80 milliliters (mL) of warm water in a cup.

What is the total weight (mass) of the white powder and water mixture?

• 20 grams

• 100 grams

• 80 grams

• we cannot determine the weight of the mixture with this information.

Henry scooped up a bucket of salt water that also had pebbles and sand. Select the answer that shows the tools in the order you would use to separate this mixture.

• evaporation dish, screen, coffee filter

• screen, coffee filter, evaporation dish

• coffee filter, screen, evaporation dish

• magnet, coffee filter, screen

A student mixed 10 g of salt in a container of water. The solution was heated on a hot plate to speed evaporation.

Which statement describes what will be left in the cup after all the water evaporates from the cup?

• 10g of salt

• 100g of salt

• 90g of salt

• 0g of salt

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Knowing the particle size of the materials in a mixture helps you know _____.

• how much the mixture will weigh

• what the crystals will look like after evaporation

• whether one of the materials will dissolve

• which tools to use to separate them

Citric acid is a solid that dissolves in water. It makes the water taste sour. A solution of citric acid and water was poured through a  filter.

Which sentence best predicts the taste of the solution after  filtering?

• The solution will taste more sour after filtering.

• The solution will taste less sour after filtering.

• The solution will taste the same after filtering because the citric acid is still dissolved in the solution.

• It is impossible to predict which will taste more sour.

Tags

NGSS.MS-PS1-2

How does the color and taste of the tea get out of the tea bag and into the hot water, while the leaves stay in the  filter-paper tea bag?

• When heat hits the tea bag it opens up and releases the color and taste into the water.

• The tea leaves go through the holes in the filter-paper tea bag and disappear into the water giving it color and taste.

• Water can go through the holes in the tea bag filter and dissolve some of the particles in the tea leaves which gives the tea color and taste.

What is a mixture?

• two or more materials mixed together

• when you stir boiling water

• when pigs fly

• when one or more materials dissolve into another

What is a solution?

• two or more materials mixed together

• three or more materials mixed together

• when one or more materials dissolves into another material

• when it rains

In the Metric system, mass means the _____ of something.

• height

• length

• width

• weight