Chemistry

Pure water melts at 0 degrees.

What happen to the water particles when water boils

• THEY GAIN ENERGY AND STAY CLOSE TOGETHER

• THEY GAIN ENERGY AND MOVE FURTHER APART

• THEY LOSE ENERGY AND STAY CLOSE TOGETHER

• THEY LOSE ENERGY AND MOVE FURTHER APART

Four processes are listed.

1. brownian motion

2. condensation

3. diffusion

4. evaporation

Which processes not involved in the change of state

• 1 and 2

• 1 and 3

• 2 and 4

• 3 and 4

• All

Which statement explains why isotopes of an element have the same chemical property

• they have different number of neutrons

• they have the same number of electrons as protons

• they have the same number of electrons in the outer shell

• they have the same number of protons in the nucleus

Which number is definitely different from isotopes of the different elements

• number of electrons

• number of protons

• number of full shells

• number of neutrons

In which substance are the particles close together and slowly moving past each other?

• air

• steam

• water

• ice

Boiling and vaporization are alike in that they both:

• take place at any point within a liquid

• occur only one particular temperature

• only occur when liquid is heated

• involve a phase change from liquid to gas

The diagram shows a cup of tea.

Which answer describes the water particles in the air above the cup compared with the water particles in the cup

• is moving faster but not closer together

• moving faster and closer together

• not moving faster but is closer together

• not moving and not closer together

Which statements are correct about solid and gas

• Solid has a high density

• Gas has a orderly arrangement

• Solid has a high compressibility

• Gas has the highest amount of kinetic energy

• Solid has the highest forces of attraction while gas has the lowest

In what states of matter does sublimation take place in

• Gas and ice

• Solid and gas

• Gas and liquid

• Solid and liquid

Which two physical changes involve heat energy being absorbed?

• Condensing and freezing

• Freezing and boiling

• Melting and boiling

• Melting and Condensation

• All