8th Grade Final Test 2024

Thermal expansion occurs because:

• Particles change from solid to a liquid.

• Particles slow down and come closer together when heated.

• Particles are destroyed by heat.

• Particles speed up and spread apart when heated.

Tags

NGSS.MS-PS1-4

What is thermal expansion?

• The decrease in temperature when a material expands.

• The increase in volume of a material when heated.

• The decrease in volume of a material when heated.

• The change in shape of a material when cooled.

Tags

NGSS.MS-PS1-4

Thermal energy always moves:

• from a lower temperature object to a higher temperature object

• from a high temperature object to a lower temperature object

• from an object with lower kinetic energy to an object with higher kinetic energy

• from an object of higher mass to an object of lower mass

Tags

NGSS.MS-PS3-5

What is the smallest unit of an element that maintains the properties of that element?

• Compound

• Mixture

• Molecule

• Atom

Which of the following is a pure substance?

• Gold

• Salad

• Air

• Salt water

What type of change occurs when water freezes into ice?

• Chemical change

• Physical Change

Tags

NGSS.MS-PS1-4

Which property would be considered a chemical property?

• Boiling point

• Flammability

• Color

• Density

Which method would be most effective for separating salt from seawater?

• Sieving

• Distillation

• Filtration

• Decanting

What is the main difference between an element and a compound?

• Compounds are made of one type of atom, while elements can contain different atoms.

• Elements are pure substances, while compounds are mixtures.

• Elements can be broken down into simpler substances, while compounds cannot.

• Elements are made of one type of atom, while compounds are made of two or more different atoms chemically bonded.

Tags

NGSS.MS-PS1-1

What happens to the atoms in a chemical reaction?

• They remain unchanged

• They are destroyed

• They are rearranged

• They are created

Tags

NGSS.MS-PS1-5