1) Answer is: False.
Balanced chemical reaction: Pb + AlCl₃ → no reaction.
The reactivity series is a series of metals from highest to lowest reactivity. Metal higher in the reactivity series will displace another.
Aluminium (Al) is higher in activity series than lead (Pb).
That means aluminium (Al) is stronger reducing agent than lead and gives electrons easier.
This series are used to summarize information about the reactions of metals with acids or water, double displacement reactions (more reactive metals displace metals with lower reactivity) and the extraction of metals from their ores.
2) Answer is: Na3PO4 + 3KOH → 3NaOH + K3PO4, because K retains the same charge throughout the reaction.
This chemical reaction is double displacement reaction - cations (K⁺ and Na⁺) and anions (PO₄³⁻⁻ and OH⁻) of the two reactants switch places and form two new compounds.
Na₃PO₄ is sodium phosphate.
KOH is potassium hydroxide.
NaOH is sodium hydroxide.
K₃PO₄ is potassium phosphate.
3) Answer is: Zn + H2SO4 → ZnSO4 + H2.
Single replacement is reaction where neutral element metal or nonmetal become an ion as it replaces another ion in a compound.
In this balanced chemical reaction zinc (Zn) replaces hydrogen (H).
Zinc changes oxidation number from 0 to +2 (this is oxidation) and hydrogen change oxidation number from +1 to 0 (reduction).
4) Answer is: A single replacement reaction takes place because sodium is more reactive than hydrogen.
Balanced chemical reaction:
2Na(s) + 2H₂O(l) → 2NaOH(aq) + H₂(g).
Single replacement is reaction where neutral element metal or nonmetal become an ion as it replaces another ion in a compound.
In this balanced chemical reaction sodium (Na) replaces hydrogen (H).
Sodium changes oxidation number from 0 to +1 (oxidation) and hydrogen change oxidation number from +1 to 0 (reduction).
5) Answer is: True.
For example, balanced chemical reaction:
Ca + 2HCl → H₂ + CaCl₂.
Reduction hald reaction: 2H⁺ + 2e⁻→ H₂.
Oxidation half reaction: Ca⁰ → Ca²⁺ + 2e⁻.
In this balanced chemical reaction calcium (Ca) replaces hydrogen (H).
In this chemical reaction, calcium lost two electrons (oxidation, change oxidation number from 0 to +2) and hydrogen gain that two electrons (reduction, change oxidation number from +1 to 0).
6) Answer is: It is a single replacement reaction, and the cations in the two ionic compounds are different.
For example, balanced chemical reaction:
Ba + MgSO₄ → BaSO₄(s) + Mg.
In this balanced chemical reaction barium (Ba) replaces magnesium (Mg), because barium is higher at activity series.
Sulfate anion (SO₄²⁻) is the same in two ionic compounds, but cations (Mg²⁺ and Ba²⁺) changes.
Single Displacement is reaction where neutral element metal or nonmetal become an ion as it replaces another ion in a compound.
