SC11a Reactivity Flashcards
what metals react with cold water?
sodium, calcium and potassium
how does calcium react with cold water?
reacts steadily with water and effervescence (fizzing) is seen as the hydrogen is produced.
how does potassium react with cold water?
floats on the water, melts, moves around, fizzes, the hydrogen burns and a lilac flame is seen.
how does sodium react with cold water?
floats on the water, melts, moves around and fizzes
Sodium + water →
2Na(s) + 2H2O(l) →
sodium hydroxide + hydrogen
2NaOH(aq) + H2(g)
what metals do not react with dilute acids?
gold, silver and copper
what does the reaction between dilute acids and metals produce?
salt and hydrogen
Mg(s) + H2SO4(aq) →
MgSO4(aq) + H2(g)
Write the equation for the reaction between zinc and dilute sulfuric acid. Include state symbols.
Zn(s) + H2SO4(aq) → ZnSO4(aq) + H2(g)
reactivity series in order?
potassium
sodium
calcium
magnesium
zinc
iron
copper
silver
gold
the more reactive the metal the greater the tendency for met….
metal atoms to lose electrons to form cations (positive ions).
what happens easier when a metal is high on the reactivity series?
more easily metal atoms lose electrons
how does potassium, calcium and sodium react with water?
react with cold water to form hydrogen and a metal hydroxide
how does magnesium, aluminium, zinc and iron react with water?
react very slowly, if at all, with cold water but react with steam to form hydrogen and a metal oxide
how does copper, silver and gold react with water?
do not react with cold water or steam
how does potassium and sodium react with dilute acid?
react violently
how does calcium, magnesium, aluminium, zinc and iron react with dilute acid?
react to form hydrogen and a salt solution
how does copper, silver and gold react with dilute acid?
do not react
when will a metal displace another metal?
metals only displace a less reactive metal from its salt solution?
Zn(s) + CuSO4(aq) →
Cu(s) + ZnSO4(aq)
zinc can displace copper but can copper displace zinc?
no as copper is less reactive
write the equation for the reaction between magnesium and zinc chloride solution. Include state symbols.
Mg(s) + ZnCl2(aq) → MgCl2(aq) + Zn(s)
- Write the equation for the reaction between copper and silver nitrate solution, AgNO3(aq). Include state symbols.
Cu(s) + 2AgNO3(aq) → Cu(NO3)2(aq) + 2Ag(s)
what is a redox reaction?
a reaction in which one substance is oxidised another is reduced).
make this into a ionic equation and half equation
Mg(s) + ZnCl2(aq) → MgCl2(aq) + Zn(s)
The reaction above can be written as the ionic equation:
Mg(s) + Zn2+(aq) + 2Cl-(aq) → Mg2+(aq) + 2Cl-(aq) + Zn(s)
The chloride ions are spectator ions as they do not change.
The ionic equation can be split into two half equations:
Mg(s) → Mg2+(aq) + 2e-
Zn2+(aq) + 2e- → Zn(s)
