Form 4 Unit 19 chemical reactions

Use for Auckland Grammar Form 4 Term 2 Exams

Cu2+ + NaOH = ?

Blue Precipitate (Blue PPP)

Cu2+ + Excess NaOH = ?

Nothing changed

Cu2+ + NH3 = ?

Blue Precipitate (Blue PPP)

Cu2+ + Excess NH3 = ?

Nothing changed

Fe2+ + NaOH = ?

Green Precipitate (Green PPP)

Fe2+ + Excess NaOH = ?

Nothing changed

Fe2+ + NH3 = ?

Nothing changed

Fe2+ + Excess NH3 = ?

Dark green Precipitate (Dark green PPP)

Fe3+ + NaOH = ?

Brick red/Orange Precipitate(PPP)

Fe3+ + Excess NaOH = ?

Nothing Changed

Fe3+ + NH3 = ?

Cloudy Precipitate (Milky PPP)

Fe3+ + Excess NH3 = ?

Nothing happens

Zn + NH3 = ?

White Precipitate (white PPP)

Zn + Excess NH3 = ?

Excess dissolves in solution

Al + NaOH = ?

Cloudy/Milky Precipitate (PPP)

Al + Excess NaOH = ?

Excess disolves

Al + NH3 = ?

White/Cloudy Precipitate (PPP)

Al + Excess NH3 = ?

Nothing changed

Br + NaOH = ?

Nothing changed

Br + Excess NaOH = ?

Nothing changed

Br + NH3 = ?

White Precipitate (White PPP)

Br + Excess NH3 = ?

Nothing changed

Test for Carbon Dioxide

Adding Calcium Carbonate to HCl produces effervescence, and putting the gas into limewater makes the limewater milky

Test for Hydrogen

Teadding magnesium to hydrochloric acid (HCl) produces hydrogen gas and a squeaky pop sound when ignited.