Period Table & Energy Random Retrieval

This quiz contains all the questions in the Period Table & Energy section. The website will pick 10 questions at random.

1 / 10

Using mean bond dissociation enthalpies, estimate the enthalpy of combustion Δ_cH of liquid ethanol

C₂H₅OH_(l) + 3O₂_(g) => 2CO₂_(g) + 3H₂O_(l)

1214 kJ mol^-1

-1274 kJ mol^-1

1725 kJ mol^-1

-1725 kJ mol^-1

2 / 10

Calculate the enthalpy change for the formation of one mole of hydrogen chloride gas from its elements given these average bond enthalpies: H-H bond enthalpy = 435 kJ mol^-1, Cl-Cl bond enthalpy = 243 kJ mol^-1 and H-Cl bond enthalpy = 432 kJ mol^-1

-93 kJ kJ mol^-1

-186 kJ mol^-1

-246 kJ mol^-1

-555 kJ mol^-1

3 / 10

Which of the following increase from left to right across the series F₂ - Cl₂ - Br₂?

(i) covalent radius of the atoms

(ii) electronegativitiy

(iii) boiling point

(iv) strength as an oxidising agent

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

4 / 10

The oxidising agent used to extract bromine from sea water in a displacement reaction is:

chlorine

iodine

oxygen

sulfur dioxide

5 / 10

What is the electron configuration of a magnesium atom?

1s²2s²

1s²2s²2p⁶3s²

1s²2s²2p⁶3s²3p⁶4s²

1s²2s²2p⁶3s²3p⁶3d⁶4s²

6 / 10

What is the oxidation number of FLUORINE in

F₂O

7 / 10

What is the oxidation number of CHROMIUM in

Cr₂O₇^2-

8 / 10

What is the oxidation number of CARBON in

C₂H₆

9 / 10

What is the oxidation number of SULFUR in

SO₃

10 / 10

In the periodic table the elements are arranged in order of:

(i) atomic number

(ii) mass number

(iii) number of protons in the nucleus

(iv) number of protons and neutrons in the nucleus.

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

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