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.
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.
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.