Relative Density Practice

What two types of measurements make up DENSITY? 

• Mass and Volume

• Temperature and Mass

• Grams and Centimeters

• Volume and Weight

Answer explanation

Density is defined as mass per unit volume. Therefore, the two types of measurements that make up density are Mass and Volume, making 'Mass and Volume' the correct choice.

Look at this image.  Which object has the LOWEST density in water? How? 

• The Ping Pong Ball because it floats to the top 

• The bolt because it has sunk to the bottom

• The soda cap because it is not just full of air like the Ping Pong ball

Answer explanation

The Ping Pong Ball has the lowest density in water because it floats, indicating its density is less than that of water. In contrast, the bolt sinks, showing it has a higher density, and the soda cap is denser than the Ping Pong Ball.

Jack has a rock. The rock has a mass of 14g and a volume of 2cm³. What is the density of the rock?

• 7 mL

• 7 g/cm³

• 28 g/cm³

• 1/7 g/cm³

Answer explanation

To find the density of the rock, use the formula: density = mass/volume. Here, density = 14g / 2cm³ = 7 g/cm³. Therefore, the correct answer is 7 g/cm³.

If an object has a density of .6 g/mL and you put it into water, will it sink or float?  

• sink

• float

Answer explanation

An object with a density of 0.6 g/mL is less dense than water (1 g/mL). Therefore, it will float when placed in water.

If an object has a density of 3.6 g/mL and you put it into water, it will (a)   .

• sink
• float

Answer explanation

An object with a density of 3.6 g/mL is denser than water (1 g/mL). Since it is denser, it will sink when placed in water.

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.MS-PS1-2

Why does the egg not sink or float?

• it is more dense than the water

• it is less dense than the water

• it has the same density as the water

• it is light

Answer explanation

The egg does not sink or float because it has the same density as the water. When an object has equal density to the fluid it is in, it will remain suspended in that fluid.

Rocks sink because they are

• the same density as the water

• less dense than the water

• more dense than the water

• because they're round

Answer explanation

Rocks sink because they are more dense than the water. Density determines whether an object will float or sink; if an object's density is greater than that of the fluid, it will sink.

If you poured 3 liquids that do not mix how could you tell which one is the most dense?

• The liquid on top

• The liquid in the middle

• The liquid at the bottom

Answer explanation

The liquid at the bottom is the most dense because denser liquids sink below less dense ones. Therefore, in a layered arrangement of non-mixing liquids, the bottom layer will always be the densest.

Why does ice float?

• Liquid water is less dense than solid water.

• Solid water is less dense than liquid water.

• Gaseous water is less dense than solid water.

• Liquid water is less dense than gaseous water.

Answer explanation

Ice floats because solid water (ice) is less dense than liquid water. This unique property allows ice to remain on the surface of water, which is crucial for aquatic life during freezing temperatures.