iGCSE combined science Chemistry C1a

Which state of matter has a fixed shape and volume?

• Gas

• Solid

• Liquid

• Plasma

What is the process called when a solid turns directly into a gas?

• Condensation

• Sublimation

• Evaporation

• Freezing

Which of the following is a pure substance?

• Air

• Sea water

• Oxygen

• Bronze

Which statement best describes a compound?

• A substance made of only one type of atom

• A mixture of two or more elements not chemically bonded

• A substance made of two or more elements chemically bonded

• A solution of two substances

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

• Molecule

• Atom

• Ion

• Compound

Which of the following is a mixture?

• Sodium chloride

• Carbon dioxide

• Lemonade

• Water

Which state of matter can be compressed easily?

• Solid

• Liquid

• Gas

• Plasma

What is the chemical symbol for sodium?

• S

• Na

• So

• Sn

Which of the following is NOT a physical change?

• Melting ice

• Dissolving salt in water

• Burning magnesium

• Boiling water

What is the charge of a neutron?

• Positive

• Negative

• Neutral

• Double positive