Acids and bases AS90944 year 11 revision.


End of term exams are looming. We revised the atomic structure aspects of this topic in class today and you may choose how you do your exam revision homework.

1) Print the practise test paper out at home and answer the questions on the printout

2) Download the practise paper onto your computer and answer the questions separately on your own paper.

3) Flick through the practise paper questions on the blog and answer them on your own paper.


Practise paper

Atoms and atomic structure

A look at the periodic table


Year 10, writing fully balanced chemical equations homework

Year 10, writing fully balanced chemical equations homework

A whole lot of the chemistry you have studied this year comes together in this exercise.

  • ions and how they are formed.
  • naming ionic compounds and writing their formula
  • word equations.

…….. and finally the last piece in the jigsaw writing a fully balanced chemical equation.

If you study NCEA chemistry at level 1 next year a rough guide is

Achievement: writing word equations.

Merit: Inserting chemical formulae into an equation.

Excellence: producing a fully balanced chemical equation.

Revise what we did today by watching the video then do the short exercise. In your notebook write down the word equation and complete it (achievement) Underneath the word equation insert the chemical formula of each substance (merit). Finally balance the equation (excellence) NOTE this usually involves sticking 2 in front of something

1 sodium hydroxide      +   sulphuric acid             ——->

2 copper oxide                 +  hydrochloric acid     ——–>


Predicting whether a precipitate will form.


Head up homework with the date. Copy the table below into your book. Imagine mixing a solution from the left hand column with a solution from the top row. If a precipitate forms when the solutions are mixed write the name of the precipitate on the grid. If no precipitate results write “no precipitate” on the grid.
Use the solubility rules from your book or from the previous post.


The first example is done for you:

mixing copper nitrate and sodium hydroxide solutions.

step 1 write the word equation and switch the names around

copper nitrate + sodium hydroxide ——-> copper hydroxide + sodium nitrate.

Step 2 are any of the products insoluble

All hydroxides apart from sodium and potassium are water insoluble. Copper hydroxide is insoluble and a precipitate is formed.

write on the grid in the first space copper hydroxide precipitates.

Precipitation reactions

Salts and their solubility in water.

Each acid has its own family of salts.

  • Sulphuric acid produces sulphates
  • Nitric acid produces nitrates
  • Hydrochloric acid produces chlorides

Salts are very often water soluble, if you stir them in water they dissolve and go into solution. Flick through the presentation to slide 4 and use the solubility rules to do the homework exercise. You can watch a precipitation reaction after slide 5.


Put the date in your book. Copy in the list and predict whether each salt is soluble in water or insoluble. The first one is done for you

Salt                                   Soluble/Insoluble

Sodium chloride                  Soluble

Calcium nitrate

Silver chloride

Lead sulphate

calcium nitrate

magnesium chloride

magnesium hydroxide

aluminium sulphate

silver sulphate

lead chloride

calcium carbonate

sodium carbonate

aluminium carbonate

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