### Mathematical Issues for Chemists

A brief outline of the mathematical issues faced by chemistry students.

### Reaction Rates

Explore the possibilities for reaction rates versus concentrations with this non-linear differential equation

### Catalyse That!

Can you work out how to produce the right amount of chemical in a temperature-dependent reaction?

# Reductant Ratios

##### Stage: 5 Challenge Level:

A very uniform grade of iron ore is known to be entirely formed from a mixture of different oxides of iron (iron oxide FeO, magnetite Fe$_3$O$_4$ and hematite Fe$_2$O$_3$), although their ratios are not known.

$1$g of this mixture is fully reduced, leaving $0.748$g of pure iron.

Must all three of the oxides indicated be present in the mixture?

Is there a smallest or largest amount of each oxide present?

What possibilities for the percentage composition of the mixture by mass does the experiment indicate?

Can you create a yield of iron which would prove the absence of at least one of the oxides of iron from the ore?