AS Associate Of Science In Chemistry

Question 1

What is the number of protons in an atom called?

Accepted Answer

Atomic number

Answer

Mass number

Answer

Atomic mass

Answer

Neutron number

Question 2

Which type of bond results from the electrostatic attraction between oppositely charged ions?

Accepted Answer

Ionic bond

Answer

Covalent bond

Answer

Metallic bond

Answer

Hydrogen bond

Question 3

According to the law of conservation of mass, what is true about a chemical reaction?

Accepted Answer

The total mass of reactants equals the total mass of products

Answer

Mass is created from energy

Answer

Mass is destroyed in exothermic reactions

Answer

Products always have greater mass than reactants

Question 4

What is the pH of a neutral solution at 25°C?

Accepted Answer

7

Answer

0

Answer

14

Answer

1

Question 5

Which subatomic particle has a negative charge and is found outside the nucleus?

Accepted Answer

Electron

Answer

Proton

Answer

Neutron

Answer

Positron

Question 6

What does the mole concept represent in chemistry?

Accepted Answer

6.022 × 10²³ particles of a substance

Answer

The mass of one atom in grams

Answer

The volume of a gas at STP

Answer

The number of neutrons in an element