PHASE CHANGES

Which best explains the relationship between heat energy and temperature? .

• As heat energy increases and temperature increases, freezing occurs

• As heat energy decreases and temperature remains constant, condensation occurs.

• As heat energy decreases and temperature remains constant, evaporation occurs.

• As heat energy increases and temperature decreases, melting occurs.

What occurs when energy is removed from a liquid-vapor system in equilibrium?

• A The amount of liquid increases.

• B The amount of vapor increases.

• C The amounts of liquid and vapor increase equally.

• D The amounts of liquid and vapor decrease equally.

An atom of which element has the strongest attraction for electrons?

• Ba

• Cs

• O

• F

Which transition occurs when light with a wavelength of 434 nm is emitted by a hydrogen atom? D The electron falls from n = 5 to n = 2.

• The electron jumps from n = 2 to n = 4.

• The electron jumps from n = 2 to n = 5.

• The electron falls from n = 4 to n = 2.

• The electron falls from n = 5 to n = 2.

In which region(s) does temperature remain constant?

• Region 1, 3, & 5
• Region 2 & 4
• Region 1 only
• Region 1 & 2

Tags

NGSS.MS-PS1-4

Suppose you pour a glass of ice water and set it on the kitchen table. After a few minutes, the outside of the glass will be covered with drops of water. Why did this happen?

• Oxygen in the air cooled and condensed onto the cold glass.

• Water vapor in the air cooled and condensed onto the cold glass.

• Water vapor in the air cooled and evaporated onto the cold glass.

• Water seeped through pores in the glass.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

What phase change is happening to the picture?

• freezing

• melting

• evaporation

• condensation

What is point A?

• triple point
• critical point
• equilibrium point
• normal melting point

Tags

NGSS.MS-PS1-4

At 0.10 atm, what phase(s) can exist?

• solid, liquid or gas
• liquid or gas
• solid only
• gas only

Tags

NGSS.MS-PS1-4

Water exists as a _____________ at 3 mmHg and 50 °C.

• solid
• liquid
• gas
• supercritical fluid

Tags

NGSS.MS-PS1-4