ESAT ESAT Chemistry

Question 1

What is the molar mass of water (H₂O)?

Accepted Answer

18 g/mol

Answer

H₂O: 2(1) + 16 = 18 g/mol, using standard atomic masses.

Question 2

In ESAT Chemistry, what does a higher activation energy indicate?

Accepted Answer

Slower reaction rate

Answer

Higher activation energy means fewer molecules have sufficient energy to react, resulting in a slower rate.

Question 3

What type of bonding involves the sharing of electron pairs between atoms?

Accepted Answer

Covalent bonding

Answer

Covalent bonds are formed by the sharing of one or more electron pairs between atoms.

Question 4

Which of the following is an example of an oxidation reaction?

Accepted Answer

Mg → Mg²⁺ + 2e⁻

Answer

Oxidation is loss of electrons (OIL RIG); Mg losing 2 electrons to form Mg²⁺ is oxidation.

Question 5

What is the pH of a solution with [H⁺] = 1 × 10⁻³ mol/L?

Accepted Answer

3

Answer

pH = -log[H⁺] = -log(10⁻³) = 3.

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