According to Dalton’s theory, elements:

• are always solids.

• contain only one kind of atom.

• can be split up into simpler substances.

• contain at least two different kinds of atom.

Which of these diagrams shows the particles in a compound?

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When magnesium ribbon reacts with steam a solid called magnesium oxide and hydrogen gas are formed.

Which of the following completes the word equation for this reaction which starts:

magnesium + ...

• hydrogen --> magnesium + water

• water --> magnesium oxide + hydrogen

• water --> magnesium + hydrogen

• magnesium oxide --> hydrogen + water

The correct symbol for iron is

• I

• Ir

• Fe

• fe

Which of the following always happens during a chemical reaction?

• Compounds react and split up into free atoms.

• Elements join together to make new elements.

• Atoms are broken down into smaller particles.

• The atoms in the reactants are rearranged to make the products.

Which of the following is a chemical change?

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The main difference between a chemical change and a physical change is that in a chemical change you always get

• a change of state.

• heat given out.

• a change in colour.

• a new substance being formed.

Which of the following could have the formula XY2?

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Which two elements in the periodic table below would have the most similar chemical properties?

• 1 & 4

• 2 & 3

• 1 & 6

• 5 & 6

Which element is very unreactive?

• Helium

• Lithium

• Hydrogen

• Fluorine