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 ranking is based on the specific densities of the liquids, with liquid 4 being the densest and liquid 1 being 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, and 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, making 'Volume' the correct choice. Other options like color, weight, and length are not needed for this calculation.

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 property that can distinguish different substances, regardless of their volume or mass.

Which liquid has the highest density? 

• corn syrup

• lamp oil

• rubbing alcohol

• honey

Answer explanation

Honey has the highest density among the options listed, typically around 1.42 g/cm³, compared to corn syrup, lamp oil, and rubbing alcohol, which have lower densities. This makes honey the correct choice.

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 compared to B and C, making it the correct choice.

Which liquid is the least dense?

• oil

• water

• syrup 

• plastic bottle

Answer explanation

Oil is less dense than both water and syrup, which means it will float on top of them. Therefore, among the given options, oil is the least dense liquid.

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 there are 5 grams of the substance 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 an electric scale measure weight, while a bunsen burner and test tube serve different purposes.