AS Associate Of Science In Chemistry

Question 1

What is the number of protons in an atom called?

Accepted Answer

Atomic number

Answer

The atomic number is the number of protons in the nucleus of an atom and uniquely identifies each chemical element.

Question 2

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

Accepted Answer

Ionic bond

Answer

An ionic bond forms when one atom donates an electron to another, creating oppositely charged ions that attract each other.

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

The law of conservation of mass states that matter is neither created nor destroyed in a chemical reaction, so the total mass of reactants equals the total mass of products.

Question 4

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

Accepted Answer

7

Answer

At 25°C, a neutral solution has equal concentrations of H⁺ and OH⁻ ions, resulting in a pH of exactly 7.

Question 5

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

Accepted Answer

Electron

Answer

Electrons carry a negative charge of −1 and orbit the nucleus of an atom in electron shells or orbitals.

AS - Associate In Science Degrees Practice Test

AS - Associate In Science Degrees Practice Test

AS Associate Of Science In Chemistry