S4 Chemistry Chapter 1 and 2

Lithium has two naturally occurring isotopes: 6Li (7% abundance)

and 7Li (93% abundance). Calculate the relative

atomic mass of lithium. (Answer with 3 significant figures)

Chromium has four naturally occurring isotopes,

and their masses and natural abundances are shown in the table below. Calculate the relative atomic mass of chromium to three decimal places.

Boron has two naturally occurring isotopes

with the natural abundances shown in the table. Calculate the relative atomic mass of boron.

(Answer with 4 significant figures)

What element is shown in the diagram?

• Magnesium

• Neon

• Sodium

• Fluorine

What element is shown in the diagram?

• Copper

• Manganese

• Chromium

• Gold

Which letter indicates where the substance is both solid and liquid phase at the same time?

In which region of the heating curve would the substance be a liquid and a gas at the same time?

Between which points is

the substance changing state?

A substance's heating curve is shown in the graph.  What is its boiling point?

A substance's heating curve is shown in the graph.  What is its melting point?