9-Week Test Preview 1st Qtr

Which property explains why copper is often used in electric wiring?

• density

• mass

• volume

• conductivity

Answer explanation

Copper is often used in electric wiring due to its high conductivity, which allows it to efficiently carry electric current. This property makes it ideal for minimizing energy loss in electrical systems.

If the formula for density is mass/volume then what is the density of an element that has a mass of 8 g and volume of 2 ml?

• 4 g/cm³

• 3 g/cm³

• 40 g/cm³

• 30 g/cm³

Answer explanation

To find density, use the formula density = mass/volume. Here, mass = 8 g and volume = 2 ml. Thus, density = 8 g / 2 ml = 4 g/ml. Since 1 ml = 1 cm³, the density is 4 g/cm³, making the correct choice 4 g/cm³.

True or False: Mass and weight are the same thing.

• True

• False

Answer explanation

False. Mass is the amount of matter in an object, measured in kilograms, while weight is the force exerted by gravity on that mass, measured in newtons. They are related but not the same.

Tags

NGSS.MS-PS2-4

True or False: Mass is the amount of matter in an object.

• True

• False

Answer explanation

True. Mass is defined as the amount of matter in an object, which is a fundamental property in physics. Therefore, the statement is correct.

True or False: A balance measures an objects mass.

• True

• False

Answer explanation

True. A balance is designed to measure the mass of an object by comparing it to known masses, making the statement accurate.

Tags

NGSS.5-PS1-3

True or False: Weight depends on the location of an object, mass does not.

• True

• False

Answer explanation

True. Weight is the force exerted by gravity on an object, which varies with location (e.g., Earth vs. Moon). Mass, however, is a measure of the amount of matter in an object and remains constant regardless of location.

Which force is measured when using a scale to measure weight?

• magnetic

• the be with you force

• gravity

• electric force

Answer explanation

When using a scale to measure weight, it measures the force of gravity acting on an object. This force pulls objects toward the Earth, which is why gravity is the correct answer.

Tags

NGSS.MS-PS2-4

NGSS.MS-PS2-5

Which below is a physical property of matter?

• flammability

• combustibility

• reactivity

• solubility

Answer explanation

Solubility is a physical property of matter, describing how well a substance dissolves in a solvent. In contrast, flammability, combustibility, and reactivity are chemical properties, indicating how substances interact with others.

Which below is NOT a chemical property of matter?

• reactivity

• flammability

• combustibility

• state of matter

Answer explanation

The state of matter (solid, liquid, gas) describes physical characteristics, not chemical properties. Reactivity, flammability, and combustibility are all chemical properties that describe how substances interact and change.

Any characteristic of matter that you can observe without changing the identity of the substances that make it up is a ___________

• great force

• physical property

• chemical property

• state of matter

Answer explanation

A physical property is a characteristic of matter that can be observed without altering the substance's identity, such as color, shape, or density. In contrast, a chemical property involves a change in the substance's identity.

Tags

NGSS.MS-PS1-2