Question 1

Which of the following is a pure substance consisting of only one type of atom?

Accepted Answer

Hydrogen

Answer

Salt

Answer

Carbon dioxide

Answer

Water

Question 2

Which element has the atomic number 8?

Accepted Answer

Oxygen

Answer

Neon

Answer

Nitrogen

Answer

Fluorine

Question 3

What is the symbol for the element Sodium?

Accepted Answer

Na

Answer

Sn

Answer

So

Answer

S

Question 4

Which of the following is an ionic compound?

Accepted Answer

NaCl

Answer

H₂O

Answer

O₂

Answer

CO₂

Question 5

Which element is essential for respiration and makes up about 21% of Earth's atmosphere?

Accepted Answer

Oxygen

Answer

Carbon

Answer

Helium

Answer

Hydrogen

Question 6

What is the atomic number of Aluminum?

Accepted Answer

13

Answer

11

Answer

12

Answer

10

Question 7

Which of the following is a property of non-metals?

Accepted Answer

Poor conductor of electricity

Answer

Malleable

Answer

Shiny appearance

Answer

Good conductor of heat

Question 8

Which element is found in all living organisms and is the basis of organic chemistry?

Accepted Answer

Carbon

Answer

Nitrogen

Answer

Oxygen

Answer

Hydrogen

Question 9

Which element has the symbol 'K'?

Accepted Answer

Potassium

Answer

Krypton

Answer

Copper

Answer

Calcium

Question 10

What type of bond is formed when atoms share electrons?

Accepted Answer

Covalent bond

Answer

Ionic bond

Answer

Hydrogen bond

Answer

Metallic bond

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