Solutions

Which of the following shows a change in an object’s state of matter?

• ice cream melting on a sidewalk

• placing ice in the freezer

• sunlight warming a swimming pool

• chilling an apple in the refrigerator

Tags

NGSS.MS-PS1-4

Why is the toaster's electrical cord covered in plastic?

• to make the toaster get hot faster

• because plastic is a good conductor of thermal energy

• because plastic is a poor conductor of electrical energy

• to make electricity in the wire flow faster

A piece of copper is placed on a hot plate for one minute. When the copper is picked up with tweezers, the copper is as hot as the hot plate. The copper is said be a —

• thermal energy insulator

• thermal energy conductor

• electrical magnet

• solid mixture

Tags

NGSS.MS-PS3-3

The diagram shows a ball in a beaker filled with water. Which statement best describes the relationship of the ball and the water?

• The water is less dense than the ball.

• The water and the ball are equally dense.

• The ball is less dense than the water.

• There is no relationship between the ball and the water.

Tags

NGSS.MS-PS1-2

At room temperature, nitrogen, oxygen, and helium are examples of which type of matter?

• Gas

• Liquid

• Plasma

• Solid

The diagram below shows a demonstration about solubility. Which material does not dissolve in water?

• Sugar

• Glue

• Oil

• Salt

Tags

NGSS.MS-PS1-2

The chart below shows the densities of three different liquids. Which illustration correctly shows how these liquids would appear if they were poured slowly into a cylinder?

• 
• 
• 
• 

Tags

NGSS.MS-PS1-2

Rosalie's father was dumping gravel to create her family's new driveway. He accidentally dropped a bucket of gravel into Rosalie's sandbox. The best way for Rosalie to get the gravel out of her sandbox is to —

• sift the mixture with a sifter.

• use a magnet to attract the rocks.

• add water to the mixture.

• heat the mixture.

Simone was helping her father repair their shed outside. By mistake, she dropped an open box of nails on a pile of dirt. The best way for Simone to separate the nails from the dirt without using her hands was by —

• adding glue

• using a shovel

• adding water

• using a magnet

A student places one teaspoon of sugar in a small beaker of water. What will happen to the sugar?

• It will change into water.

• It will dissolve in the water.

• It will melt to form a liquid.

• It will keep all its properties.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5