Chemistry

Question 1

What is the definition of Atomic Number?

Answer 1

Number of protons in an atom

The atomic number determines the element’s identity.

Question 2

What is the definition of Mass Number?

Answer 2

Number of protons plus neutrons in an atom

This is used to calculate the atomic mass.

Question 3

What does Atomic Mass represent?

Answer 3

Weighted average of isotopes

It accounts for the relative abundance of each isotope.

Question 4

What is the formula for the Ideal Gas Law?

Answer 4

PV = nRT

P = pressure, V = volume, n = number of moles, R = gas constant, T = temperature.

Question 5

What is Avogadro’s number?

Answer 5

6.022 x 10^23

It represents the number of molecules in one mole of a substance.

Question 6

Fill in the blank: The combined gas law is a relation between pressure, volume, and _______.

Answer 6

temperature

Question 7

What are the three primary gas laws?

Answer 7

• Boyle’s Law
• Charles’s Law
• Gay-Lussac’s Law

Each law describes the relationship between pressure, volume, and temperature of gases.

Question 8

True or False: The mass number is equal to the number of protons in an atom.

Answer 8

False

The mass number includes both protons and neutrons.

Question 9

What does the term ‘molecular weight’ refer to?

Answer 9

Mass of a molecule based on its composition

It is calculated by adding the atomic weights of all atoms in the molecule.

Question 10

Constant parameter in Boyle’s Law

Answer 10

Temperature

Question 11

Constant parameter in Charles’s Law

Answer 11

Pressure

Question 12

Constant parameter in Gay Lussac’s Law

Answer 12

Volume

Question 13

Constant parameter in Avogadro’s Law

Answer 13

n number of moles