Grades 5 to 9

Why does a cork float in a glass of water?

• the cork is more dense than the water

• the cork is less dense than the water

• the cork is the same density as the water

• the cork doesn't have density

Answer explanation

Things that FLOAT are LESS DENSE than the liquid they are floating in.

A cork floats in water, but coins sink. Which TWO (2) statements are correct?

• the cork is less dense than the water and the coins

• the coins are less dense than the water and the cork

• the coins are more dense than the water, but less dense than the cork

• the coins are more dense than the water and the cork

• the cork is less dense than the water, but more dense than the coins

Tags

NGSS.MS-PS1-2

What two measurements are needed to find the density of an object?

• mass and weight

• weight and length

• volume and mass

• volume and weight

Answer explanation

The top of the heart looks like a M for MASS.

The bottom of the heart looks like a V for VOLUME.

What causes some things to float and others to sink?

• size

• weight

• density

• gravity

Answer explanation

Large things with a lot of weight can float, like a large log.

Small things that don't weigh a lot can sink, like a tiny rock.

DENSITY is the reason things float or sink.

How does the salt affect the water?

• the salt increases the density of the water

• the salt decreases the mass of the water

• the salt increases the volume of the water

• the salt decreases the density of the water

Which one of these objects will SINK in water?

• Object A:

  density = 1.7 g/mL

• Object B:

  density = 0.3 g/mL

• Object C:

  density = 0.99 g/mL

• Object D:

  density 0.7 g/mL

What is the process by which plants make their own food using sunlight?

• Photosynthesis

• Respiration

• Transpiration

• Digestion

Tags

NGSS.MS-LS1-6

Which of the following is a non-renewable resource?

• Solar energy

• Wind energy

• Coal

• Hydroelectric energy

What is the chemical formula for water?

Tags

NGSS.MS-PS1-1

Which planet is known as the Red Planet?

• Earth

• Mars

• Jupiter

• Venus