Mixtures and Solutions Investigation

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.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

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.

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.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

NGSS.MS-PS3-4

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