7.1 Unit Test

Alisa placed a small seashell on the pan of a balance. What other tool does she need to determine the density of the seashell?

• scale

• calculator

• thermometer

• graduated cylinder

Based on what you know about changes in matter, explain why the diagram shows a physical change rather than a chemical change.

• The particles get smaller.

• The volume of the matter decreases.

• The particles of the matter stays the same.

• The particles change into particles of different substances.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

A child is upset because his ice cream is melting. He thinks he now has less dessert. Which of the following explanations correctly states why the child is incorrect?

• He actually has more, not less, ice cream.

• No mass is lost during a change of state.

• The mass will increase if he freezes the melted ice cream.

• Mass is lost only during certain changes of state, such as freezing.

Tags

NGSS.MS-PS1-4

Josie partially filled a graduated cylinder with water. She then dropped a rock into the water. The illustration below shows what happened to the level of the water inside the graduated cylinder. Which property of matter is Josie measuring?

• mass

• length

• weight

• volume

Which of the following is a way in which elements and compounds are similar?

• Elements and compounds are both pure substances.

• Elements and compounds are both listed on the periodic table.

• Elements and compounds are both made up of different kinds of atoms.

• Elements and compounds can both be broken down by physical changes.

Which process is an example of a physical change?

• burning

• rusting

• flattening

• decomposing

Which types of changes observe the law of conservation of mass?

• only changes of state

• only physical changes

• only chemical changes

• physical changes and chemical changes

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The diagram below shows a Venn diagram to compare the properties of solids, liquids, and gases. What property, which only solids have, is in position 1?

• definite shape

• definite volume

• particles that do not move

• particles are always in motion

What happens to the temperature of a sample of matter as it changes from a liquid to a gas?

• Temperature increases.

• Temperature decreases.

• Temperature remains constant.

• Temperature first decreases, and then increases.

Tags

NGSS.MS-PS1-4

On a hot day, a puddle dries up. Which statement describing this event is true?

• The water in the puddle boils and becomes a gas.

• The water in the puddle evaporates into water vapor.

• The water in the puddle condenses and becomes part of air.

• The water in the puddle changes into particles of oxygen in the air.

Tags

NGSS.MS-ESS2-4

NGSS.MS-PS1-4