Which of the following best defines chemistry?

• The study of living organisms

• The study of matter and its interactions

• The study of celestial objects

• The study of forces and motion

Which of the following is NOT considered a branch of chemistry?

• Organic chemistry

• Biochemistry

• Astronomy

• Physical chemistry

What is the smallest unit of an element that retains its chemical properties?

• Molecule

• Proton

• Atom

• Compound

Which of the following is an example of a chemical change?

• Ice melting

• Paper burning

• Salt dissolving in water

• Breaking a glass

Which of the following states of matter has a definite volume but takes the shape of its container?

• Solid

• Liquid

• Gas

• Plasma

Which subatomic particle carries a negative charge?

• Proton

• Neutron

• Electron

• Nucleus

The number of protons in the nucleus of an atom is known as its:

• Atomic weight

• Atomic number

• Mass number

• Valency

Which of the following is a homogeneous mixture?

• Sand and iron filings

• Oil and water

• Saltwater

• Salad

Which type of bond involves the sharing of electrons between atoms?

• Ionic bond

• Covalent bond

• Hydrogen bond

• Metallic bond

Which law states that mass is neither created nor destroyed in a chemical reaction?

• Law of Conservation of Mass

• Law of Definite Proportions

• Law of Multiple Proportions

• Avogadro's Law