Which two statements about this ball and stick model of ammonia are correct?

• The model shows how many electrons the nitrogen atom has.
• The model shows the single covalent bonds between the nitrogen and hydrogen atoms.
• The model shows how much space each atom fills.
• The model shows that the nitrogen atom is bigger than the hydrogen atoms.
• The model shows the lone pair of electrons on the nitrogen atom.

Molecules can be represented using dot and cross diagrams.

Draw on this

Complete the dot and cross diagram for hydrogen chloride, $HCl$. Show the electrons in the outer shells only.

At room temperature, nitrogen is a gas and ethanol is a liquid.

Use the particle model to describe two differences between the movement or arrangement of the particles in nitrogen and the particles in ethanol.

Pentene reacts with bromine to make a product.

The relative formula mass of the product is $230.0$.

There are $5$ carbon atoms and $10$ hydrogen atoms in the product.

Calculate how many bromine atoms are in the product.

(Relative atomic masses ($A_r$): $H=1.0$, $C=12.0$, $Br=80.0$)