Investigate the molecular masses in this sequence of molecules and deduce which molecule has been analysed in the mass spectrometer.

Explore the distribution of molecular masses for various hydrocarbons

Many physical constants are only known to a certain accuracy. Explore the numerical error bounds in the mass of water and its constituents.

Get some practice using big and small numbers in chemistry.

Work out the numerical values for these physical quantities.

Work with numbers big and small to estimate and calculate various quantities in physical contexts.

Work with numbers big and small to estimate and calculate various quantities in biological contexts.

Examine these estimates. Do they sound about right?

Work with numbers big and small to estimate and calulate various quantities in biological contexts.

When you change the units, do the numbers get bigger or smaller?

Make an accurate diagram of the solar system and explore the concept of a grand conjunction.

Estimate these curious quantities sufficiently accurately that you can rank them in order of size

Use trigonometry to determine whether solar eclipses on earth can be perfect.

How many generations would link an evolutionist to a very distant ancestor?