Chemistry level 8 Quiz

What is the main difference between elements and compounds?

• Elements are made of one type of atom, while compounds are made of two or more types of atoms chemically bonded.

• Elements can be broken down into simpler substances, while compounds cannot.

• Elements are always gases, while compounds are always solids.

• Elements have a fixed boiling point, while compounds do not.

Which of the following best describes the motion of particles in a gas?

• Particles vibrate in fixed positions.

• Particles move freely and rapidly in all directions.

• Particles slide past each other slowly.

• Particles are tightly packed and do not move.

What is the term used to describe the change from a solid directly to a gas?

• Melting

• Condensation

• Sublimation

• Evaporation

Which of the following is a property of liquids?

• Fixed shape and volume

• High compressibility

• Fixed volume but no fixed shape

• No fixed volume or shape

What does the kinetic theory of matter state about the temperature of a substance?

• Temperature is unrelated to particle motion.

• Temperature is a measure of the average kinetic energy of the particles.

• Temperature is the same as the boiling point.

• Temperature is the same as the melting point.

Which of the following is an example of a mixture?

• Air

• Sodium chloride (NaCl)

What is the chemical formula for a molecule of oxygen?

Which of the following best describes diffusion?

• The movement of particles from an area of low concentration to an area of high concentration.

• The movement of particles from an area of high concentration to an area of low concentration.

• The movement of particles in a fixed position.

• The movement of particles in a circular motion.

What is the boiling point of water at standard atmospheric pressure?

Which of the following is a characteristic of gases?

• Definite shape and volume

• High density

• Low compressibility

• No definite shape or volume