Science 8 - Review Session

Which of the following is a compound?

• Helium (He)

• Nitrogen (N₂)

• Carbon monoxide (CO)

• Aluminum (Al)

Which of the following is an element?

• Water (H₂O)

• Carbon dioxide (CO₂)

• Oxygen (O₂)

• Sodium chloride (NaCl)

Which of the following is a chemical property of matter?

• Color change when heated
• Reactivity with acids
• Melting point
• Density measurement

Which state of matter has a definite shape and volume?

• Solid
• Plasma
• Gas
• Liquid

Which state of matter has particles that are free to move in all directions and take the shape of their container?

• Plasma
• Liquid
• Solid
• Gas

Which of the following is a physical change?

• Burning wood

• Rusting iron

• Cooking an egg

• Melting of ice into water

Which process describes a solid turning directly into a gas?

• Sublimation
• Melting
• Condensation
• Evaporation

The mass number of an element is the sum of:

• Protons and electrons

• Electrons and neutrons

• Protons and neutrons

• Neutrons and isotopes

An element has an atomic number of 22. How many protons does it have?

• 11

• 10
• 12

• 22

A neutral atom of carbon has 6 protons. How many electrons does it have?

• 6
• 10
• 8
• 4