Question 1

Which of the following is a chemical change?

Accepted Answer

Rusting of iron

Answer

Dissolving sugar in water

Answer

Boiling of water

Answer

Melting of ice

Question 2

What is the main gas produced during photosynthesis?

Accepted Answer

Oxygen

Answer

Nitrogen

Answer

Hydrogen

Answer

Carbon dioxide

Question 3

What is the atomic number of carbon?

Accepted Answer

6

Answer

12

Answer

14

Answer

8

Question 4

Which part of the atom contains protons and neutrons?

Accepted Answer

Nucleus

Answer

Orbital

Answer

Valence shell

Answer

Electron cloud

Question 5

Which of the following elements is a noble gas?

Accepted Answer

Neon

Answer

Hydrogen

Answer

Nitrogen

Answer

Oxygen

Question 6

What is the process by which a liquid turns into a gas?

Accepted Answer

Evaporation

Answer

Condensation

Answer

Precipitation

Answer

Sublimation

Question 7

What is the boiling point of water at sea level in degrees Celsius?

Accepted Answer

100

Answer

200

Answer

0

Answer

50

Question 8

What is the atomic number of oxygen?

Accepted Answer

8

Answer

16

Answer

12

Answer

6

Question 9

What do you call the number of protons in an atom's nucleus?

Accepted Answer

Atomic number

Answer

Valence number

Answer

Molecular weight

Answer

Mass number

Question 10

Which of the following best describes an exothermic reaction?

Accepted Answer

A reaction that releases heat

Answer

A reaction that produces gas

Answer

A reaction that absorbs heat

Answer

A reaction that changes color

Question 11

What is the chemical formula for table salt?

Accepted Answer

NaCl

Answer

CaCl2

Answer

KCl

Answer

MgCl2

Question 12

Which element is represented by the symbol 'O'?

Accepted Answer

Oxygen

Answer

Carbon

Answer

Iron

Answer

Gold

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