Avogadro's Number

Calculating the number of atoms present from a given number of moles of a substance (element or molecule).

6.02 x 1023

Concentration (grams per litre)

Calculating concentration in grams per litre from a given mass of substance and volume of water.

C = g/L

Concentration (M)

Calculating the molarity of a solution from a given volume of solution and mass of solute.

n = m/M, C (M) = n/V (L)

Concentration (M)

Calculating the molarity of a solution from a given volume and number of moles of solute.

C (M) = n/V (L)

Concentration (mg L-1)

Calculating the concentration of a substance in a solution in mg L-1 based on a mass of solute and volume of solution.

C (ppm) = msolute (mg) / Vsolution (L)

Concentration (ppm)

Calculating the concentration of a substance in a solution in ppm based on given mass of solute and solution.

C (ppm) = msolute (mg) / msolution (kg)

Concentration and Dilutions

Calculate the new concentration of a solution formed after adding a fixed volume of water.

c1V1=c2V2

Electronic Configuration

Determining the element from a given electronic configuration in the ground state (first 40 elements).

1s2 2s2...

Electronic Configuration

Writing the electronic configuration for a given ion, positively or negatively charged (first 40 elements).

1s2 2s2...

Electronic Configuration

Writing the electronic configuration for a given element in the ground state (first 40 elements).

1s2 2s2...

Mass from Moles

Calculating the mass of a substance from the given number of moles and the molecular formula.

m = n x Mr

Molarity from Mass & Volume

Concentration (molarity) of a solution from a given mass and formula of a compound and a volume of water.

n=m/Mr and n=CV

Moles from Mass

Calculating the number of moles of a substance from a give mass and given molecular formula.

n = m/Mr

pH of Basic Solutions

Calculating the pH of a basic solution using the concentration of the solution and the dissociation constant for water.

Kw = [OH-][H3O+], pH=-log10[H3O+]

Relative Molecular Mass

Questions based on calculating the relative molecular mass for compounds with formulas given.

Mr = Ar1 + ... + Arn

Specific Heat Capacity

Questions based on calculating the amount of energy required to increase the temperature of a mass of water.

Q = mcΔT

Using the Periodic Table

Questions that use the periodic table to find the symbol for an element from a given atomic number.

Symbol from Z

Using the Periodic Table

Questions that use the periodic table to find the name for an element from a given atomic number.

Name from Z