The salt copper(II) sulfate can be made from which of the following pairs of chemicals?
Copper(II) nitrate and sulfuric acid.
Copper(II) carbonate and sodium sulfate.
Copper(II) oxide and sulfuric acid.
Hydrochloric acid is added to sodium hydroxide, which contains a few drops of phenolphthalein indicator. What colour change is observed?
Pink to colourless.
Colourless to pink.
Yellow to red.
Which of the following sequences for preparing a dry sample of a hydrated salt from a salt solution is correct?
Evaporate the salt solution to dryness and dry crystals between two pieces of filter paper.
Evaporate until some of the water is removed, leave to cool and crystallise, filter the crystals and dry crystals between two pieces of filter paper.
Evaporate until some of the water is removed, filter the crystals and dry crystals between two pieces of filter paper.
Which statement is true about the pH scale?
pH 6 is an alkaline solution.
pH 7 is a neutral solution.
pH 8 is an acidic solution.
Universal indicator is used to determine the pH of a solution. Which statement is correct?
Universal indicator turns red in strong alkali.
Universal indicator turns blue in strong acid.
Universal indicator turns orange in weak acid.
When preparing a salt from an insoluble base and an acid, which of the following sequences is correct?
Add base to acid until excess base remains on the bottom of the beaker, filter and dry the residue.
Add base to acid until excess base remains on the bottom of the beaker, filter and evaporate the filtrate.
Add acid to base until excess acid remains on the bottom of the beaker, filter and evaporate the filtrate.
Which of the following equations represents the ionic equation for the neutralisation of an acid with an alkali?
NaOH + HCl → NaCl + H2O
H+ + Cl- → HCl
H+ + OH- → H2O
Which word equation representing reactions of acids is incorrect?
Acid + alkali → salt + water
Acid + metal carbonate → salt + water + carbon dioxide
Acid + metal → salt + water
Which is the correct formula for ethanoic acid?
CH2COOH
C2H5COOH
CH3COOH
Which statement is true about weak acids?
They fully ionise in water.
They partially ionise in water.
They have a pH of 8-10.