AP Chem Units Quiz

Which unit must temperature ALWAYS be in for PV=nRT

K

Which value of R should you use if pressure is in kPa?

8.314 L·kPa/mol·K

What are the correct units for specific heat (c)?

J/g·°C

The unit for heat (q) is:

J or kJ

Which equation is used for phase changes?

q = mΔH or q = nΔH

The unit for reaction rate is:

M/s

What are the units of k for a second-order reaction?

M⁻¹·s⁻¹

The unit of half-life is:

seconds

What units do equilibrium constants (Keq, Kc, Kp) have?

No units

The unit for concentration [X] is:

mol/L (M)

What units do pH and pOH have?

No units

The unit for standard cell potential is:

Volts

In ΔG = −nFE, what are the units of F?

C/mol e⁻

In q = It, what unit is current (I)?

Amps

What is the unit for molarity?

mol/L

n M₁V₁ = M₂V₂, what is required for volume units?

Must match (same units)

If your units don’t match in a calculation, what does it mean?

You made a mistake