5.5 A

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

NGSS.MS-PS3-4

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.

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

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

List the steps of the scientific method

d

e

f

c

b

a

Conduct experiment

Communicate results

Analyze results

Ask a question

Draw conclusions

Form a hypothesis

Tags

NGSS.MS-LS1-5

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

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?

• 
• 
• 
• 

Which change occurs when lemon juice is mixed with water?

• The mass of the lemon juice decreases.

• The water becomes a solid.

• The lemon juice dissolves and spreads out evenly in the water.

• The volume of the water decreases.

Tags

NGSS.MS-PS1-2