EIT Chemistry and Materials Science

Question 1

The atomic number of an element represents the number of:

Accepted Answer

Protons in the nucleus

Answer

Neutrons in the nucleus

Answer

Electrons in the outermost shell

Answer

Nucleons (protons + neutrons)

Question 2

Avogadro's number (6.022 × 10²³) represents the number of entities in:

Accepted Answer

One mole of a substance

Answer

One gram of any element

Answer

One liter of gas at STP

Answer

One kilogram of any compound

Question 3

The pH of a neutral aqueous solution at 25°C is:

Accepted Answer

7

Answer

0

Answer

14

Answer

1

Question 4

The ideal gas law PV = nRT uses R = 8.314 J/(mol·K) when pressure is in:

Accepted Answer

Pascals (Pa)

Answer

Atmospheres (atm)

Answer

Bar

Answer

mmHg

Question 5

The crystal structure of iron (Fe) at room temperature is:

Accepted Answer

Body-centered cubic (BCC)

Answer

Face-centered cubic (FCC)

Answer

Hexagonal close-packed (HCP)

Answer

Simple cubic (SC)

Question 6

Faraday's law of electrolysis states that the mass deposited at an electrode is proportional to:

Accepted Answer

The total charge passed through the electrolyte

Answer

The voltage applied

Answer

The electrode surface area

Answer

The temperature of the solution