(a)[2]
Complete the dot-and-cross diagram to show how the electrons are arranged in an ammonia molecule.
(b)[1]
Complete the word equation for the reaction between aqueous ammonia and dilute hydrochloric acid. ammonia + hydrochloric acid $\rightarrow$ [BLANK]
(c)[1]
Describe the colour change seen when excess aqueous ammonia is added to an acidified methyl orange solution.
(d)[2]
Aqueous ammonia reacts with aqueous copper(II) ions to form compound B. Compound B has the formula CuN$_4$H$_{16}$O$_2$. Fill in the table to calculate the relative molecular mass of compound B.
(e)[1]
Ammonia is used in the production of fertilisers. State why farmers add fertilisers to the soil in which crops will be grown.