G4 TX Science Chapter 3 Test

Selena observes that the contents of the beaker appear evenly dispersed, meaning the liquid looks the same throughout. The beaker could hold a solution of two liquids.

• Yes, because solutions are evenly mixed and look uniform throughout.

• No, because solutions are always solids dissolved in liquids.

• Yes, but only if the liquids are the same color.

Tags

NGSS.MS-PS1-2

Myron wonders if the liquid is a solution of salt and water. Which is the most useful way he can gather evidence to answer his question?

• He can look closely at the liquid with a hand lens.

• He can vigorously stir the liquid with a spoon.

• He can place a spoonful of the liquid in sunlight and let it evaporate.

Tags

NGSS.MS-PS1-2

The mixture is a solution. Explain.

• Yes, because the components are evenly distributed.

• No, because the components are not mixed at all.

• No, because the mixture is a suspension.

The food dye in the water is observed to:

• Spread out and mix with the water

• Stay in one spot without moving

• Form a solid at the bottom

• Rise to the top and float

Tags

NGSS.MS-PS1-2

Marlene is investigating a powdery solid in the form of a cube. She drops the cube in a glass of water. Which observation would support the conclusion that the solid dissolves in water?

• The cube breaks apart into two halves.

• The cube appears to slowly shrink and then seems to dissolve.

• The cube moves back and forth in the water and remains the same size and shape.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The photo shows a variety of pebbles along the shore of a lake. Why is the set of pebbles an example of a mixture but not a solution?

• A solution must be clear, like water or air.

• A solution must appear the same throughout all its parts.

• A solution must be made of only one material.

Mrs. Arguello shows samples of soil and water to the class. She plans to demonstrate that matter is conserved when the two samples are mixed together. Which two steps should her demonstration include?

• Measure the temperature of each sample before they are mixed together.

• Measure the mass of each sample before they are mixed together.

• Measure the temperature of the samples after they are mixed together.

• Observe any change in color when the samples are mixed together.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Myra mixes 30 grams of water with 40 grams of oil. How can she demonstrate that matter is conserved in the mixture?

• By showing the total mass after mixing is 70 grams

• By showing the oil disappears after mixing

• By showing the water evaporates after mixing

• By showing the mass decreases after mixing

Tags

NGSS.MS-PS1-5

The photo shows a layer of oil over a layer of water.

• oil over water

• water over oil

• oil mixed with water

• only water

Which mixture is most likely to appear the same as a mixture of salt and water?

• a mixture of gravel (small rocks) and water

• a mixture of gravel (small rocks) and salt

• a mixture of sugar and water

• a mixture of salt and sugar