Conservation of Mass

A class of students collected cardboard boxes to be recycled. The students found that the stack of boxes have a mass of 5.4 kilograms. In order to be accepted at the center, the recycling center requires that the boxes be broken down to lay flat.

What will be the mass of the flat boxes?

• 2.7 kilograms

• 5.4 kilograms

• 8.1 kilograms

• 10.8 kilograms

A chef needs a block of ice for a party. The mass of the ice must be exactly 7.5 kilograms.

What mass of liquid water should the chef measure to end up with the correct mass of ice?

• 7.5 kilograms

• 7.7 kilograms

• 7.3 kilograms

• 7.0 kilograms

Tags

NGSS.MS-PS1-5

Which could cause the mass of an object to change?

• placing the object on the moon

• measuring in metric units

• breaking the object into parts and rearranging the pieces

• subtracting matter from the object

To keep her water cold at school, Julie freezes her water bottle. Her friend, Joe, said that freezing the water makes it heavier and harder to carry. Which of the following statements is true?

• Joe is correct because solids have more mass than liquids

• Joe is correct because cold water has more mass than warm water.

• Joe is incorrect because solids have less mass than liquids.

• Joe is incorrect because the mass of the water would not change.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Luke creates a model to observe the water cycle. He poured water into a clear container and closed it tightly. He weighed the container.

Two days later, Luke observed about half of the water had evaporated and water droplets formed on the sides of the container.

Which is true about the weight of the container?

• The container weighs the same as it did 2 days ago

• The container weighs much less than it did 2 days ago

• The container weighs half as much as it did 2 days ago

• The container weighs more than it did 2 day ago

Tags

NGSS.MS-ESS2-1

NGSS.MS-ESS2-4

10g of salt is added to 50 g of water. The salt dissolved. What is the mass of the solution?

• 40 g

• 50 g

• 60 g

• 500 g

Tags

NGSS.MS-PS1-5

Four small pitchers were weighed and packaged for shipment. This picture shows the pitchers and their weights. One of the boxes was dropped. All the pieces of the broken pitcher were placed on the balance. Which pitcher was broken?

• Pitcher A

• Pitcher B

• Pitcher C

• Pitcher D