Which statement is not correct about this equilibrium? H2(g) + I2(g) ↔ 2HI(g)

The concentration of products and reactants are equal.

Which is not a cause of the difference between experimental ΔcH values & values in data books?

Bond energies used are an average

Which is the correct trend going down group 2?

1st IE decreases, alkalinity of hydroxide increases.

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Periodic table and energy

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OCR A Level Chemistry A Module 3. The periodic table, reactivity trends, enthalpy, equililbrium and reaction rates.

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Answers

1
Which equation represents the second ionisation energy of potassium?
K(g) → K2+(g) + 2e-
K+(g) → K2+(g) + e-
K(s) → K2+(g) + 2e-
K+(s) → K2+(g) + e-
2
Which ion would make a white precipitate with silver nitrate that dissolves in dilute ammonia?
chloride
carbonate
sulfate
bromide
3
What are the units for K_c for this equilibrium? 2SO_2(g) + O_2(g) ↔ 2SO_3(g)
no units
mol dm-3
dm3 mol-1
mol2 dm-6
4
Which reaction is not a disproportionation reaction?
Cu2O + H2SO4 → Cu + CuSO4 + H2O
3S + 6NaOH → 2Na2S + Na2SO3 + 3H2O
Cl2 + H2O → Cl- + ClO- + 2H+
Ca + 2H2O → Ca(OH)2 + H2
5
Which statement is not correct about this equilibrium? H_2(g) + I_2(g) ↔ 2HI_(g)
The concentration of products and reactants are equal.
A higher concentration of HI will move the equilibrium left.
Increasing the pressure will not alter the equilibrium.
It must take place within a closed system.
6
Which sequence shows the melting point decreasing from left to right?
S, Cl, Ar
Si, P, S
Al, Si, P
P, S, Cl
7
Which statement about the halogens is incorrect?
Br- will reduce I2
F2 has the greatest tendency to be reduced
Cl2 will oxidise I-
I2 is violet in organic solvents
8
Which reaction is the enthalpy change equal to the bond enthalpy of H-Br?
HBr(g) → 1/2 H2(g) + 1/2 Br2(g)
HBr(g) → H(g) + Br(g)
H(g) + Br(g) → HBr(g)
HBr(g) → H+(g) + Br-(g)
9
Which is not a cause of the difference between experimental Δ_cH values & values in data books?
Incomplete combustion of the fuel
Evaporation of the fuel from the wick
Heat loss to the surroundings
Bond energies used are an average
10
Which is the correct trend going down group 2?
1st IE decreases, alkalinity of hydroxide increases.
1st IE decreases, alkalinity of hydroxide decreases.
1st IE increases, alkalinity of hydroxide decreases.
1st IE increases, alkalinity of hydroxide increases.

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