Polytechnic Chemistry

Question 1

What is the atomic number of carbon?

Accepted Answer

6

Answer

12

Answer

8

Answer

4

Question 2

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

Accepted Answer

7

Answer

0

Answer

14

Answer

1

Question 3

What type of bond forms between atoms with high electronegativity difference?

Accepted Answer

Ionic bond

Answer

Covalent bond

Answer

Metallic bond

Answer

Hydrogen bond

Question 4

What is Avogadro's number?

Accepted Answer

6.022 × 10²³

Answer

6.022 × 10²⁰

Answer

3.14 × 10²³

Answer

1.67 × 10⁻²⁷

Question 5

Which element has the chemical symbol Na?

Accepted Answer

Sodium

Answer

Nickel

Answer

Nitrogen

Answer

Neon

Question 6

What is the law of conservation of mass?

Accepted Answer

Mass cannot be created or destroyed in a chemical reaction

Answer

Mass increases during combustion

Answer

Mass of products is always less than reactants

Answer

Mass is conserved only in physical changes