KS3 Chemistry Quiz

What is the particle model of matter used to explain?

• The smell of gases

• The differences between solids, liquids, and gases

• The color of different substances

• The taste of different chemicals

What happens during a chemical reaction?

• Atoms change into different elements

• Atoms are destroyed

• Atoms are rearranged but not created or destroyed

• Atoms are created

What is the main cause of gas pressure?

• The color of the gas

• The temperature of the gas

• The weight of the gas

• Particles colliding with the walls of the container

What is a catalyst?

• A substance that stops a chemical reaction

• A substance that slows down a chemical reaction

• A substance that speeds up a chemical reaction

• A substance that changes color during a reaction

What is the pH scale used to measure?

• How acidic or basic a substance is

• The weight of a substance

• The temperature of a substance

• The color of a substance

What is the main component of the Earth's atmosphere?

• Hydrogen

• Nitrogen

• Oxygen

• Carbon dioxide

What is the process of separating a solid solute from a solution called?

• Filtration

• Evaporation

• Sublimation

• Condensation

What is the purpose of the periodic table?

• To organize elements with similar properties

• To list all known compounds

• To show the colors of elements

• To display the weights of compounds

What is thermal decomposition?

• A method of cooling substances

• A process of mixing two substances

• A chemical reaction where a compound breaks down when heated

• A way to measure temperature

What is a displacement reaction?

• A more reactive element replaces a less reactive element from its compound

• Two elements combine to form a compound

• A compound breaks down into elements

• An element changes into another element