Question Library

- Due to its unique powerful oxidizing nature, Nitric acid is often used in rocket fuels as a propeller NB: Ethanol (not Ethanoic acid) is used alone or mixed with petrol as fuel for racing cars and in rockets.

Other residues (apart from bitumen) are used as fuel, pipe coating, etc

Ethyne is a sometimes used a fuel in miners'lamps.

Adhering to the basic naming rules, this compound is identified as 4 - ethyloctane

- Alkanes will react with Oxygen if they are given sufficient Activation Energy. This will result in a highly Exothermic reaction, producing Carbon Dioxide and Water, which makes Alkanes very useful as fuels.

Borax solution refers to sodium borax in water. it is used for cleaning purposes. borax is mildly alkaline and can help break down acidic stains, such as those from coffee

Cyclohexane is formed when Benzene (vapor) undergoes addition reaction with hydrogen in the presence of nickel catalyst at 180^\circC

Ethylene is a plant hormone produced during fruit ripening which mobilizes the genes to synthesize the enzymes which are responsible for fruit ripening.

C3H7OH ( PROPANOL) ⇒ 97ºC C7H16 ( HEPTANE ) ⇒ 98.42ºC ;and C4H10 ( BUTANE ) ⇒ -1ºC ALTERNATIVELY, In general, the higher the molecular mass of a substance, the higher its boiling point. This is because larger molecules have more intermolecular forces of attraction, which must be overcome for the substance to boil. If the molecular masses of each of the compounds are calculated, propanol (60g/mol), heptane(100g/mol) while butane(58g/mol). Arrangement in increasing order will be C4H10 → C3H7OH → C7H16 - Option D

Bromine water is an orange solution of bromine. It becomes colorless when it is shaken with an alkene. Alkenes can decolorize bromine water, but alkanes cannot. X is ethene which decolorizes bromine water showing that ethene is unsaturated. Y is an alkane.

- Chloroform / tricholoromethane ( CHCl\(_3\) ) is a potent anaesthetic agent. - Though Chloroform is no longer used as an anaesthetic for several reasons, the most important of which is the relatively high risk of complications, including possible heart failure

x - y = 2 ...........(1) x\(^2\) - y\(^2\) = 8 ........... (2) x - 2 = y ............ (3) Put y = x - 2 in (2) x\(^2\) - (x - 2)\(^2\) = 8 x\(^2\) - (x\(^2\) - 4x + 4) = 8 x\(^2\) - x\(^2\) + 4x - 4 = 8 4x = 8 + 4 = 12 x = \(\frac{12}{4}\) = 3 from (3), y = 3 - 2 = 1 therefore, x = 3, y = 1

0.000215215 x 0.000028 = 215 x 10-4 x 28 x 10-4 = 215 x 28 x 10-6-6 = 6020 x 10-12 = 6.020 x 103 x 10-12 = 6.02 x 103 - 12 = 6.02 x 10-9

x + y - ax = ay = (x + y) -a(x + y) = (x + y)(1 - a)

1 litre = N63.00 xlitres = N900.00 x x N63 = N900 x 1 litre x = \(\frac{900}{63} \times litre\) x = \(\frac{100}{7}\) litres Also, 1 litre = 14km \(\frac{100}{7}\) = y y x 1 litre = \(\frac{100litre}{7}\) x 14km y = 20km