ESAT ESAT Chemistry 3

Question 1

What is the empirical formula of a compound with 40% C, 6.67% H, and 53.33% O by mass?

Accepted Answer

CH₂O

Answer

C₂H₄O₂

Answer

CH₄O

Answer

C₂H₂O

Question 2

In ESAT Chemistry, what does the rate equation r = k[A]²[B] indicate?

Accepted Answer

Second order in A and first order in B, third order overall

Answer

First order in both A and B

Answer

Zero order overall

Answer

Second order in B and first order in A

Question 3

What is a buffer solution?

Accepted Answer

A solution that resists pH change on addition of small amounts of acid or base

Answer

A solution of neutral pH

Answer

A solution that changes colour with pH

Answer

A solution that conducts electricity

Question 4

Which periodic trend describes the decrease in atomic radius across a period (left to right)?

Accepted Answer

Increasing nuclear charge attracting electrons more strongly

Answer

Decreasing number of electron shells

Answer

Increasing electron shielding

Answer

Decreasing atomic mass

Question 5

What is produced when an acid reacts with a base?

Accepted Answer

Salt and water

Answer

Salt and carbon dioxide

Answer

Water and hydrogen gas

Answer

Oxide and water

Question 6

What is the standard electrode potential of the standard hydrogen electrode (SHE)?

Accepted Answer

0.00 V

Answer

1.00 V

Answer

-1.00 V

Answer

0.76 V