Acid Reactions

Select a typical observation made when reacting a substance with an acid.

• Bobbles

• Bubbles

• Troubles

• Doubles

Select another typical observation made when reacting a substance with an acid.

• Solid appears, an answer is produced.

• Solid disappears, an answer is produced.

• Solid disappears, a solution is produced.

• Solid appears, a solution is produced.

Select another typical observation made when reacting a substance with an acid.

• Heat is absorbed.

• No temperature change.

• Heat is taken in.

• Heat is released.

Select the term meaning 'heat is released.'

• Exothermic

• Endothermic

• Homothermic

• Heterothermic

Select something another common observation in acid reactions.

• Reversible change of state

• Reversible change of shape

• No colour change

• Colour change

Select the missing product in the 'squeaky pop' test for hydrogen gas.

acid + metal -> hydrogen + .........

• water

• glucose

• sugar

• salt

Select the missing in the 'squeaky pop' test for hydrogen gas.

2HCl(aq) + Mg(s) → MgCl₂(aq) + ..........

• H₂(g)

• H₂(s)

• H₂(aq)

• H₂

Write down the name of the salt in the 'squeaky pop' test for hydrogen gas.

hydrochloric acid + magnesium → ............. + hydrogen

• magensium hydroxide

• hydrogen chloride

• magnesium chloride

• sodium chloride

Write down what (g) means in this equation.

2HCl(aq) + Mg(s) → MgCl₂(aq) + H₂(g)

Write down how many molecules of HCL are needed to balance this equation.

HCl(aq) + Mg(s) → MgCl₂(aq) + H₂(g)