AQA Chemistry revision

What are all substances made of?

• Atoms

• Molecules

• Cells

• Compounds

What is the smallest part of an element that can exist?

• Atom

• Molecule

• Compound

• Mixture

Atoms of each element are represented by:

• Atomic number

• Chemical symbol

• Molecular weight

• Electron configuration

How many different elements are shown in the periodic table?

• 118

• 120

• 115

• 110

Compounds are formed by the combination of:

• elements

• molecules

• atoms

• ions

What do chemical reactions always involve?

• The formation of new substances

• The change in temperature

• The presence of a catalyst

• The use of water

How can compounds be separated into elements?

• By chemical reactions

• By physical methods

• By heating

• By cooling

A mixture is:

• a combination of two or more substances that are not chemically bonded

• a single pure substance

• a chemical reaction between two elements

• a type of chemical bond

Which of the following is not a method to separate mixtures?

• Filtration

• Crystallisation

• Chemical reaction

• Chromatography

Fill in the blank: Filtration is used to separate solid particles from a ______ or gas.

• liquid

• solid

• mixture

• solution