IGCSE Chemistry Paper-1: Specimen Questions with Answers 75 - 76 of 99

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Passage

In the below questions. Complete the following puzzle.

Complete the Puzzle Above

Question 75 (6 of 6 Based on Passage)

Question

MCQ▾

ACROSS: At position 48, a versatile element found in many different chemical compounds.

Choices

Choice (4)

a.

Nitrogen

b.

Hydrogen

c.

carbon

d.

Oxygen

Answer

c.

Explanation

Carbon is a chemical element with symbol C and atomic number 6. On the Periodic table, it is the first of six elements in column 14, which have in common the composition of their outer electron shell. Carbon is a versatile element and is found in many different chemical compounds, including those found in space. Carbon is versatile because it can form single, double, and triple bonds. It can also form chains, branched chains, and rings when connected to other carbon atoms.

Completed Puzle Given in the Question

Question 76

Question

MCQ▾

What is the Chemical formula and chemical name of vinegar?

Choices

Choice (4)

a.

Carbonic acid - H2 CO3

b.

Acetic acid - CH3COOH

c.

Lactic acid - CH3CH (OH) COOH

d.

Nitric Acid - HNO3

Answer

b.

Explanation

Acetic acid has a chemical formula CH3COOH . Vinegar is roughly 3 – 9 % acetic acid by volume, making acetic acid the main component of vinegar apart from water. Vinegar is now mainly used as a cooking ingredient. Historically, as the most easily available mild acid, it had a great variety of industrial, medical and domestic uses, some of which (such as its use as a general household cleanser) are still promoted today.

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