Sc-6th-Ch 3-Rev

................. comprises everything that has mass and volume, in addition to other properties.

• mass

• matter

• the law of the conservation of

  mass and energy

• energy

When expressing characteristics that are perceived with the senses, such as color, scent, or hardness, we are describing ................. .

• mass

• volume

• properties

• density

The amount of matter an object possesses that is measured in grams (g) or kilograms (kg) is known as ................. .

• mass

• volume

• matter

• density

Electrons are subatomic particles that ................. .

• have a positive electric charge

• have a negative electric charge

• have no electric charge

• have both charges

Protons are subatomic particles that ................. .

• have a positive electric charge

• have a negative electric charge

• have no electric charge

• have both charges

Electrons stay ................. .

• close to the nucleus due to the electrical attraction to protons

• inside the nucleus due to the electrical attraction to protons

• close to the nucleus due to the electrical attraction to neutrons

• inside the nucleus due to the electrical attraction to neutrons

___________ can be physically separated into pure substances.

• alloys

• mixtures

• physical

• chemical

For their part, compounds can be separated into their elements, but only by means of __________ changes.

• alloys

• mixtures

• physical

• chemical

The smallest particle of an element that displays its same properties is known as an __________ .

• atom

• electron

• protons

• mixture

An atom’s nucleus is composed of two particles: __________ and neutrons.

• atom

• electron

• protons

• mixture