FOSS Mixtures and Solutions i-Check 1

Salt can be purchased in two grain sizes: small-grain table salt and large-grain kosher salt. A student dissolved 10 g of each kind of salt in two different containers of water. Each solution was heated on a hot plate to speed evaporation. Which statement describes what will be left in each cup after all the water evaporates from each cup? (Mark the one best answer.)

• 0 g of small-grain salt and 5 g of large-grain salt

• 90 g of small-grain salt and 90 g of large-grain salt

• 100 g of small-grain salt and 10 g of large-grain salt

• 10 g of small-grain salt and 10 g of large-grain salt

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

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. The teacher gave students permission to taste the solution after filtering it. Which sentence best describes how the solution tasted after it was poured through the filter? (Mark the one best answer.)

• The solution tasted more sour after filtering.

• The solution tasted less sour after filtering.

• The solution tasted the same after filtering.

• It is impossible to know how sour it was without actually tasting it.

Tea bags are small bags made of filter paper filled with tea leaves. You make tea by placing the tea bag into hot water and letting it sit for a few minutes. Explain how 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 bag.

• The water and color goes through the filter paper but not the tea leaves

• The tea leaves also go through the filter paper with the water.

• Nothing went through the filter paper.

Knowing the particle size of the solid materials in a mixture helps you know _____. (Mark the one best answer.)

• 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 the materials

Students drew these crystals in their notebooks from observations made in class. Later when looking on the Internet they found this photograph of crystals. What substance do you think made these crystals? (Mark the one best answer.)

• Salt

• Citric acid

• Epsom salts

Tags

NGSS.MS-PS1-1

A fifth-grade student was showing her little brother what she was learning in science class. She mixed 20 g of a white powder in 80 mL of warm water. The mixture stayed clear. Her brother said, “Wow! That’s magic! The white powder is gone!”

Why the white powder could not be seen when it was mixed with the warm water.

• The power and the water become a mixture.

• You can still see the powder even though it is in the water.

• The powder and the water did not mix.

Tags

NGSS.5-PS1-1

NGSS.5-PS1-3

b. What is the weight (mass) of the white powder and water mixture? 80ML + 20g = ?

• 150 grams

• 100 grams

• 75 grams

• 125 grams

Tags

NGSS.MS-PS1-5

Students in a 5th grade class were learning about how and why materials change. They observed an ice cube turn to a puddle on a plate.

An ice cube turns into a puddle on a plate.

How many substances are involved?

• More than one

• Only one

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

Students in a 5th grade class were learning about how and why materials change. They observed a cup of tea get sweet when a spoonful of sugar was added.

A spoonful of sugar cannot be seen after it is mixed with a cup of tea.

How many substances are involved?

• More than one

• Only one

Tags

NGSS.MS-PS1-2

Think about the energy transfer involved when the ice cube changes. An ice cube turns into a puddle on a plate.

Is energy required to make the change happen?

• Yes

• No

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4