Quiz in chemical for secondary school

What is the chemical formula for methane?
a) CH3
b) CH4
c) CO2
d) C2H6

Which type of bond involves the sharing of electrons?
a) Ionic bond
b) Covalent bond
c) Metallic bond
d) Hydrogen bond

What is the process of one substance going from a gaseous state to a liquid state?
a) Condensation
b) Sublimation
c) Evaporation
d) Freezing

Which gas is most abundant in Earth's atmosphere?
a) Oxygen
b) Carbon dioxide
c) Nitrogen
d) Hydrogen

What is the chemical formula for table salt?
a) H2O
b) NaCl
c) CO2
d) HCl

What is the process of combining substances to form a new substance called?
a) Decomposition
b) Ionization
c) Reaction
d) Fusion

Which gas is essential for respiration and is released during combustion?
a) Nitrogen
b) Oxygen
c) Carbon dioxide
d) Hydrogen

What is the process of a liquid changing into a gas called?
a) Condensation
b) Sublimation
c) Evaporation
d) Freezing

Which subatomic particle carries a negative charge?
a) Proton
b) Neutron
c) Nucleus
d) Electron

Which of the following is an example of a chemical change?
a) Melting ice
b) Dissolving sugar in water
c) Boiling water
d) Rusting of iron

What is the state of matter in which particles are tightly packed and have a definite shape and volume?
a) Solid
b) Liquid
c) Gas
d) Plasma

What is the SI unit for measuring the amount of a substance?
a) Mole
b) Gram
c) Liter
d) Meter