Chemistry ch 15-16-17 test review

The average kinetic energy in the particles of a sample is that substance’s __________.

• enthalpy

• entropy

• temperature

• heat

Which branch of science studies the transfer of energy during chemical reactions or phase changes?

• thermochemistry

• thermodynamics

• enthalpy

• enthachemistry

Tags

NGSS.HS-PS1-4

NGSS.HS-PS1-5

Enthalpy is a measure of __________ at a constant pressure.

• length

• area

• thermal energy

• volume

Tags

NGSS.HS-PS3-1

On a heating curve, the thermal energy represented by the horizontal portion of the curve is __________ heat.

• specific

• latent

• sensible

• ideal

The heat that produces a phase change is called __________ heat.

• sensible

• latent

• entropic

• enthalpic

The amount of heat required to convert 1 mol of liquid at its boiling point to its vapor at the same temperature is called its molar enthalpy of __________.

• vaporization

• combustion

• fusion

• formation

Tags

NGSS.HS-PS3-4

Ammonia has a molar enthalpy of vaporization of 23.3 J/mol. Water’s enthalpy of vaporization is 40.7 kJ/mol. What can we deduce from these figures?

• There are stronger intermolecular attractions between water molecules than between ammonia molecules.

• There are stronger intermolecular attractions between ammonia molecules than between water molecules.

• We can deduce nothing about intermolecular attractions from these figures.

• Water must have a higher entropy.

What symbol represents specific heat?

• s

• Csp

• Q

• H

Why does hot water cool more slowly than metal?

• The metal has more entropy than water.

• Water has a higher specific heat than the metal.

• The metal has more enthalpy than water.

• Water has more enthalpy than the metal.

Tags

NGSS.HS-PS3-4

The specific heat of copper is 0.39 J/(g • °C), and that of silver is 0.23 J/(g • °C). Which metal would have the higher temperature if the same amount of thermal energy were added to 50.0 g of each metal?

• copper

• silver