Science Review

A student grouped several materials into two categories after testing their ability to conduct thermal energy.

Group 1: Copper wire, aluminum sheet, Steel spoon, brass rod

Group 2: , rubber stopper, plastic straw, fabric,wooden stick

Why were these materials placed into these two groups?

• One group is man-made; the other is natural.

• One group conducts thermal energy; the other does not.

• One group floats in water; the other sinks.

• One group is magnetic; the other is nonmagnetic.

A student stirs a spoonful of sugar into a cup of warm water. After a few minutes, no sugar can be seen. Later, the student leaves the cup in the sun until the water is gone and tiny crystals remain at the bottom.

• Mass

• Solubility

• Density

• Flexibility

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

During a science activity, a bracelet, a plastic straw, and a marble fall into a bucket of water. Which explanation describes how to separate these objects?

• The straw is less dense than water and floats, so it can be scooped out.

• The bracelet dissolves, so it can be filtered.

• The marble is less dense than water and floats, so it can be removed with a net.

• The straw has the same density as water, so it sinks to the bottom.

A student dissolves 15 g of sugar in 150 mL of water at 25°C. They then add several ice cubes and stir until all the ice has melted. Which TWO properties of the solution change?

• Volume of the solution

• Mass of the sugar

• Physical state of the sugar

• Temperature of the solution

A container holds a mixture of small iron nails and dry sand. Which tool is BEST for separating the nails from the sand?

• A. A magnet

• B. A spoon

• C. A filter funnel

• D. A strainer

Select TWO examples that show a change in state of matter.

• Butter melting on warm toast

• Water vapor condensing on a cold glass

• Chopping a block of wood into smaller pieces

• Coloring water with food dye

Tags

NGSS.MS-PS1-4

Students observe four items and record their properties:
• Cork: light, floats in water, not magnetic
• Steel bolt: heavy, sinks in water, magnetic
• Plastic bead: light, floats in water, not magnetic
• Aluminum washer: shiny, sinks in water, not magnetic
Which property can be used to sort these items into two groups?

• Mass

• Solubility

• Magnetism

• Flexibility

Tags

NGSS.5-PS1-3

A student stirs sand and salt into a cup of water. After a few minutes, the sand is visible at the bottom, but the salt is not. Which statement best explains this observation?

• Both sand and salt are insoluble.

• Only salt is soluble in water.

• Only sand is soluble in water.

• Both sand and salt dissolve completely.

Tags

NGSS.MS-PS1-2

Students wrapped identical metal cans of hot water with different materials. The starting temperature of each can was 90°C. After 10 minutes, they recorded the temperatures below. Wrapping Material Water Temperature (°C) No wrapping 72 Cotton cloth 80 Aluminum foil 75 Wool sweater 84 Which material slowed down the loss of heat the MOST?

• No wrapping

• Cotton cloth

• Aluminum foil

• Wool sweater

Tags

NGSS.MS-ETS1-3

NGSS.MS-PS3-3

NGSS.MS-PS3-4

Students tested how much sugar could dissolve in 100 mL of water at different temperatures before sugar crystals remained at the bottom. Water Temperature (°C) Sugar Dissolved (g) 10 55 20 85 30 110 40 135 Which conclusion is best supported by the data?

• Sugar dissolves more quickly at colder temperatures.

• Sugar dissolves more when water temperature increases.

• The amount of sugar that dissolves stays the same at all temperatures.

• The sugar changes to a different substance at higher temperatures.