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WorksheetsENERGY CHANGE AND ACIDS & BASES
Total questions: 10
Worksheet time: 10mins
The chemical equation that represents an endothermic reaction:
NH4NO3(s) + H2O(ℓ) → NH4+(aq) + NO3-(aq) ΔH > 0
2Mg(s) + O2(g) → 2MgO(s) ΔH < 0
Zn(s) + 2HCℓ(aq) → ZnCℓ2(aq) + H2(g) + heat
H2(g) + Cℓ2(g) → 2HCℓ(g) ΔH = -131 kJ∙mol-1
The CORRECT formula for nitric acid:
H2SO4
CH3COOH
NH3
HNO3
Which ONE of the reactions below will produce the salt sodium ethanoate (sodium acetate)?
HCℓ(s) + CH3COOH(aq) →
CH3COOH(aq) + H2O(ℓ) →
CH3COOH(aq) + NaOH(aq) →
H2CO3(aq) + NaOH(aq) →
According to the Arrhenius theory, all bases …
are proton donors.
are proton acceptors.
form H3O+ ions in solution.
form OH- ions in solution.
Which ONE of the following is NOT a typical reaction of hydrochloric acid?
It neutralises a base with the release of hydrogen gas.
It forms hydronium ions in water.
It colours lithmus paper red.
It forms CO2 when reacting with a metal carbonate.
Which ONE of the following pairs represents the conjugate acid and conjugate base of HPO42- ?
A
B
C
D
Which ONE of the following indicates the CORRECT colour of bromothymol blue in an acid and a base?
A
B
C
D
Consider the chemical equation below:
OH- (aq) + HCO3- (aq) ⟺ CO32- (aq) + H2O(ℓ)
The Lowry-Brønsted bases in the above reaction are …
HCO3- (aq) and OH- (aq)
H2O(ℓ) and OH- (aq)
H2O(ℓ) and HCO3- (aq)
OH- (aq) and CO32-(aq)
A few drops of bromothymol blue indicator are added to a hydrochloric acid solution, HCℓ(aq). When ammonium hydroxide, NH4OH(aq), is added to this solution, the colour of the indicator will change from …
blue to yellow.
yellow to blue.
yellow to red.
blue to red.
The diagram shows the energy profile for a reaction that occurs with and without a catalyst
Which one of the following can be deduced from the diagram?
2 is the activation energy of the reverse catalysed reaction.
The forward catalysed reaction is endothermic.
The enthalpy change of the reaction is (4 – 1)
The enthalpy change of the reaction is decreased by using a catalyst
