Polytechnic Chemistry 3

Question 1

What is an isotope?

Accepted Answer

Atoms of the same element with different numbers of neutrons

Answer

Isotopes are variants of the same element that have the same number of protons but different numbers of neutrons.

Question 2

What is Boyle's Law in terms of gas pressure and volume?

Accepted Answer

At constant temperature, pressure and volume of a gas are inversely proportional

Answer

Boyle's Law states P₁V₁ = P₂V₂ at constant temperature — halving the volume doubles the pressure.

Question 3

What is an acid according to the Brønsted-Lowry definition?

Accepted Answer

A proton donor

Answer

In the Brønsted-Lowry model, an acid is defined as a substance that donates a proton (H⁺) to another substance.

Question 4

What is the valence shell of an atom?

Accepted Answer

The outermost electron shell

Answer

The valence shell is the outermost electron shell of an atom, and its electrons participate in chemical bonding.

Question 5

What is Le Chatelier's Principle?

Accepted Answer

A system at equilibrium will shift to counteract any imposed change

Answer

Le Chatelier's Principle states that a chemical system at equilibrium shifts its position to minimize the effect of any applied stress.

Polytechnic Practice Test