Density

Frank has an eraser. It has a mass of 4g, and a volume of 2cm³. What is its density?

• 8 g/cm³

• 2 g/cm³

• 1/2 g/cm³

• 24 g/cm³

Answer explanation

Density is calculated by dividing mass by volume. Here, density = mass (4g) / volume (2cm³) = 2 g/cm³. Therefore, the correct answer is 2 g/cm³.

Tags

NGSS.MS-PS1-2

Put the liquids in order from most dense to least dense?

• 4, 3, 2, 1

• 1, 2, 3, 4

• 3, 4, 2, 1, 

• 4, 3, 1, 2

Answer explanation

The correct order from most dense to least dense is 4, 3, 2, 1. This is based on the specific densities of the liquids, where liquid 4 is the densest and liquid 1 is the least dense.

Tags

NGSS.5-PS1-3

An object with which of the following densities will float on water?

• 0.7 g/cm3

• 1.2 g/cm3

• 3.5 g/cm3

• 11.4 g/cm3

Answer explanation

An object will float on water if its density is less than that of water (1 g/cm³). Since 0.7 g/cm³ is less than 1 g/cm³, it will float, while the other options (1.2, 3.5, 11.4 g/cm³) will sink.

Tags

NGSS.5-PS1-3

A student knows the mass of an object. What other variable does the student need to know to calculate the object's density?

• Color

• Weight

• Volume

• Length

Answer explanation

To calculate density, the formula is density = mass/volume. Therefore, knowing the volume of the object is essential in addition to its mass. The correct answer is Volume.

Which would be the most useful for identifying an unknown liquid?

• Weight

• volume

• mass

• density

Answer explanation

Density is the most useful property for identifying an unknown liquid because it is a characteristic value that relates mass and volume, allowing for comparison with known substances to determine identity.

Which liquid has the highest density? 

• corn syrup

• lamp oil

• rubbing alcohol

• honey

Answer explanation

Honey has the highest density among the options listed. It is thicker and heavier than corn syrup, lamp oil, and rubbing alcohol, making it the correct choice for the liquid with the highest density.

Which substance is the least dense? **Use the key 

• A

• B

• C

Answer explanation

Substance A is the least dense among the options provided. Density is defined as mass per unit volume, and A has the lowest value, making it the correct choice.

Which liquid is the least dense?

• oil

• water

• syrup 

• plastic bottle

Answer explanation

Oil is less dense than water and syrup, making it the least dense liquid among the options. This is why oil floats on water.

What is the density of this substance?

• 5 grams

• 5 ml

• 5 g/ml

•  10 g/ml

Answer explanation

Density is defined as mass per unit volume. The correct choice, 5 g/ml, indicates that the substance has a mass of 5 grams in every milliliter, which is the proper way to express density.

Which lab tool might you use to measure the volume of a liquid?

• electric scale

• bunsen burner

• test tube

• graduated cylinder

Answer explanation

A graduated cylinder is specifically designed to measure the volume of liquids accurately, making it the correct choice. Other options like electric scales and bunsen burners serve different purposes.