CIE Chemistry (US-0439): Specimen Questions with Answers 145 - 147 of 240

Question number: 145

MCQ▾

Question

The Gram Atomic Mass of sodium (Na) is ________.

Choices

Choice (4) Response

a.

24

b.

22

c.

11

d.

23

Answer

d.

Explanation

  • Standard temperature and pressure (STP) is defined as and 1 atm of pressure. The molar volume of a gas is the volume of one mole of the gas at a given temperature and pressure. At STP, one mole of any gas occupies a volume of

  • Gram Atomic Mass of an element is its Relative Atomic Mass expressed in grams.

1 mole of a substance occupies a volume

1 Mole of a Substance Occupies a Volume

1 mole of a substance occupies a volume

The Relative Atomic Mass of sodium (Na) is so the Gram Atomic Mass of sodium (Na) is

Question number: 146

Short Answer Question▾

Write in Short

What is the molecular formula of malonic acid?

[1 Marks]

Explanation

Molecular formula of malonic acid is C3H4O4.

Question number: 147

Short Answer Question▾

Write in Short

Alkanes and alkenes are both series of hydrocarbons

  1. What is the difference between these two series of hydrocarbons?

.

Explanation

  1. Saturated hydrocarbons are the simplest of the hydrocarbon species. They are composed entirely of single bonds and are saturated with hydrogen. The formula for acyclic saturated hydrocarbons (i. e. , alkanes) is . The most general form of saturated hydrocarbons is , where r is the number of rings. Those with exactly one ring are the cycloalkanes. Saturated hydrocarbons are the basis of petroleum fuels and are found as either linear or branched species.
  2. Unsaturated hydrocarbons have one or more double or triple bonds between carbon atoms. Those with double bond are called alkenes. Those with one double bond have the formula (assuming non-cyclic structures). Those containing triple bonds are called alkyne. Those with one triple bond have the formula .