Introduction to Chemistry Quiz

What is the basic unit of matter?

• Atom

• Molecule

• Element

• Compound

Which of the following is a noble gas?

• Oxygen

• Nitrogen

• Helium

• Carbon

Which part of the atom has a positive charge?

• Neutron

• Electron

• Proton

• Nucleus

The chemical formula for water is:

• H2O

• HO2

• O2H

• H2O2

What type of bond involves the sharing of electron pairs between atoms?

• Ionic bond

• Covalent bond

• Metallic bond

• Hydrogen bond

Which of the following pH values indicates a strong acid?

• 2

• 5

• 7

• 10

In which state of matter are particles most closely packed together?

• Solid

• Liquid

• Gas

• Plasma

What is the main component of air?

• Hydrogen

• Oxygen

• Nitrogen

• Carbon dioxide

The law of conservation of mass states that:

• Mass can be created or destroyed

• Mass can be converted into energy

• The mass of reactants equals the mass of products

• Mass is irrelevant in chemical reactions

Which of the following reactions is exothermic?

• Photosynthesis

• Melting of ice

• Combustion of wood

• Electrolysis of water