Science Focus 2 - Chapter Tests - Pearson Australia Media Resources

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Science Focus 2 TEST Chapter 2: Atoms 6 Quartz has the chemical formula SiO2 . This means that in quartz A for every atom of silicon, there are 2 atoms of oxygen. B for every atom of oxygen, there are 2 atoms of silicon. C silicon and oxygen form groups, containing two of each type of atom. D one atom of silicon bonds with one atom of oxygen, to make a group containing two atoms. 7 Which of the following is a chemical change? A Sawdust is produced from wood being cut by a power saw. B Water freezes to form ice. C Fireworks explode in a colourful display. D Juice is obtained from an orange. 8 A combination reaction is best described as one in which A a substance is broken down to form two or more different substances. B a new substance is formed by the combination of two or more substances. C an insoluble, sometimes colourful, solid is formed from two liquids. D a substance reacts with oxygen. 9 A chemical reaction may be sped up by A using more concentrated reactants. B heating the reactants. C using more finely ground reactants. D all of the above. 10 A catalyst A speeds up a chemical reaction without actually combining with reactants. B dissolves chemicals that water is unable to. C is one of the ‘ingredients’ in a chemical reaction. D is a large molecule that is broken down by a smaller one. 11 In the chemical reaction: iron + sulfur → iron sulfide A iron and sulfur are products. B iron sulfide is the product. C iron, sulfur and iron sulfide are products. D sulfide is the product. © Pearson Education Australia (a division of Pearson Australia Group Pty Ltd) 2005. This page from the Science Focus 2 Teacher’s Resource may be photocopied for classroom use. 1 1 1 1 1 1
Science Focus 2 TEST Chapter 2: Atoms 12 Which of the following famous scientists is not known for their theory of atomic structure? A Dalton. B Thomson. C Rutherford. D Newton. 13 An atom consists of A a nucleus containing neutrons and protons, surrounded by fast-moving electrons. B central neutrons, surrounded by fast-moving electrons and protons. C central electrons, surrounded by fast-moving protons. D a mixture of protons and electrons spread evenly in a neutral ‘dough’. 19 14 An atom of 9F contains A 19 protons and 9 electrons. B 9 protons, 9 electrons and 10 neutrons. C 10 protons, 9 neutrons and 9 electrons. D 9 protons, 19 neutrons and 10 electrons. 15 A phosphorus atom has an atomic number of 15. How many electrons does it have in its third (outermost) shell? A 0 B 2 C 5 D 8 © Pearson Education Australia (a division of Pearson Australia Group Pty Ltd) 2005. This page from the Science Focus 2 Teacher’s Resource may be photocopied for classroom use. 1 1 1 1
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Science Focus 2 - Chapter Tests - Pearson Australia Media Resources

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