NABTEB

How are ionization energies related to the reactivity of these elements? – NABTEB QUESTION

As the group is descending. The ionisation energy decreases, hence it becomes less difficult to form the ions. With the…

5 years ago

Explain the meaning of Ionization energy. – NABTEB QUESTION

Ionization energy is the energy needed to remove the outermost electron from an atom/gaseous atom to form an ion/gaseous ion…

5 years ago

Describe briefly five properties which show a general gradation as the group is descending from lithium to caesium. – NABTEB QUESTION

Properties that show a gradual gradation down the group. 1. Reactions with cold water become increasingly more vigorous. 2. The…

5 years ago

Describe a test which would enable you to demonstrate that an hydrogen is unsaturated. – NABTEB QUESTION

Solution I will pass the hydrocarbon into bromine/ bromine water which is purple in colour. If the bromine becomes decolourised,…

5 years ago

What is unsaturated in organic chemistry? – NABTEB QUESTION

Solution Unsaturation is a term/phenomenon used in describing a molecule that contains a multiply (double/triple) bond.

5 years ago

Write an equation for the reaction of the ethane and ethyne with oxygen. – NABTEB QUESTION

Solution CH4 + 2O2 → 2H2O + CO2 2C2H2 + 5O2 → 4CO2 + 2H2O

5 years ago

Write equation each for the preparation of a jar of ethane and ethyne. – NABTEB QUESTION

Solution (i) CH3COONa(s) + NaOH(aq) → Na2CO3(s) + CH4(g) (ii) CaC2(s) +2H2O (l) → Ca(OH)2(aq) + C2H2(g)

5 years ago

List two reagents required for the conversion of propan-2-ol to propanone. – NABTEB QUESTION

The two reagents are: Tetraoxosulphate (vi) acid {H2SO4 } and potassium tetraoxomanganate (vii) or potassium heptaoxochromate (vi). {KMnO4/K2Cr2O7}

5 years ago

Explain how vegetable oil is converted to margarine. – NABTEB QUESTION

The vegetable oil is heated to about 18°C using nickel catalyst. Hydrogen in Bubbled in at 5 atoms. Pressure and…

5 years ago

State two physical differences between fats and oil. – NABTEB QUESTION

Fats are solid at room temperature/have high melting points while oil are liquids at room temperature or have low melting…

5 years ago