Density and Unit Conversions

Convert 2 kilograms (kg) to grams (g).

• 20 g

• 200 g

• 2000 g

• 20,000 g

Answer explanation

Make sure units on the top cancel units on the bottom!

Convert 5 kilograms (kg) to grams (g).

• 50 g

• 500 g

• 5000 g

• 50,000 g

Answer explanation

The known value has 1 sig fig so your answer should only have 1 sig fig!

A graduated cylinder contains 50 mL of water. An object is dropped in, and the water level rises to 65 mL. What is the volume of the object?

• 15 mL

• 50 mL

• 65 mL

• 115 mL

Answer explanation

Subtract the initial volume from the final volume!

(Subtract the volume before you add the object from the volume after you added the object to the water)

• 250 g

• 25 g

• 2.5 g

• 0.25 g

Answer explanation

A student measures the mass of a rock as 30 g. Using water displacement, the volume of the rock is found to be 10 mL. What is the density of the rock?

• 0.3 g/mL

• 3 g/mL

• 30 g/mL

• 300 g/mL

Answer explanation

Remember that no units are canceling out here!

The units of density will always be a unit of mass divided by a unit of volume, such as grams/milliliters (g/mL)

• Cannot be determined

• Cannot be determined

• The object's volume is less than 20 mL

• The object's volume is greater than 20 mL

• The object's volume is exactly 20 mL

• The object's volume is less than 16 mL

Answer explanation

I used a greater than sign because the object sinks, so it must have a greater density than that of the liquid.

A student has a graduated cylinder with 100 mL of water. They add a metal cube, and the water rises to 112 mL. The mass of the cube is 84 g. Using this information, determine if the cube will sink or float in water and justify your answer.

• The cube will float because its density is less than water.

• The cube will sink because its density is greater than water.

• The cube will float because its volume is greater than its mass.

• The cube will sink because its mass is less than its volume.

Tags

NGSS.MS-PS2-2

Which liquid is the most dense?

• Oil

• Water

• Syrup

• Air