Picat General Science 2

Question 1

What is the atomic number of carbon?

Accepted Answer

6

Answer

Carbon has 6 protons in its nucleus, giving it an atomic number of 6.

Question 2

Which type of chemical bond involves the sharing of electrons between atoms?

Accepted Answer

Covalent bond

Answer

Covalent bonds form when two atoms share one or more pairs of electrons.

Question 3

What is the pH value of a neutral solution at room temperature?

Accepted Answer

7

Answer

Pure water and neutral solutions have a pH of 7, where hydrogen and hydroxide ion concentrations are equal.

Question 4

Which state of matter has a definite volume but no definite shape?

Accepted Answer

Liquid

Answer

Liquids have a fixed volume but take the shape of their container because their particles can flow past each other.

Question 5

Which element is the most abundant in Earth's atmosphere?

Accepted Answer

Nitrogen

Answer

Nitrogen (N₂) makes up approximately 78% of Earth's atmosphere by volume.

Picat Practice Test