Released STAAR Science

A student reads the label on the bottle of salad dressing shown below. Why would the student shake the salad dressing well before using it?

• Vinegar and oil have different densities.

• Vinegar and oil easily form a solution.

• Vinegar and oil both contain water.

• Vinegar and oil are both liquids.

Tags

NGSS.MS-PS1-2

A teacher mixes a white powder into a beaker of water. The powder cannot be seen in the water. The teacher then heats the mixture until the water evaporates and the powder can be seen again. Which property of the powder is the teacher demonstrating?

• Solubility

• Density

• Conductivity

• Mass

Tags

NGSS.MS-PS1-2

Which of these is the best conductor of electricity?

• Glass rod

• Cotton string

• Plastic tubing

• Copper penny

A teacher wears protective gloves to lift a metal pan filled with boiling water from a hot plate. Why are the protective gloves necessary?

• The metal pan creates thermal energy.

• The metal pan insulates thermal energy.

• The metal pan conducts thermal energy.

• The metal pan reduces thermal energy.

What is the process by which plants release water vapor into the air through their leaves?

• Condensation

• Transpiration

• Evaporation

• Precipitation

Tags

NGSS.MS-ESS2-4

Which of the following is a chemical change?

• Dissolving salt in water

• Boiling water

• Burning wood

• Melting ice

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following is an example of a physical change?

• Rusting of iron

• Burning of gasoline

• Dissolving sugar in water

• Cooking an egg

In the water cycle, which process involves water vapor cooling and changing into liquid water?

• Evaporation

• Condensation

• Precipitation

• Transpiration

Tags

NGSS.MS-PS1-4

What is the primary function of the chloroplasts in plant cells?

• To break down sugar molecules to release energy

• To store water and nutrients

• To capture light energy and convert it into chemical energy

• To control the entry and exit of substances in and out of the cell

Tags

NGSS.MS-LS1-6

What type of symbiotic relationship benefits one organism without harming the other?

• Mutualism

• Commensalism

• Parasitism

• Predation