chemistry Quiz 1. What changes when an ion is made from an atom? A the number of electrons only B the number of neutrons only C the number of protons only D the number both of protons and of neutrons 2. Magnesium, on the left of Period Two of the Periodic Table, is more metallic than chlorine on the right of this Period. Why is this? Magnesium has A.fewer electrons. B .Fewer protons. C .fewer full shells of electrons. D. fewer outermost electrons. 3. Some chemical compounds are purified by recrystallisation. What can be used to test the purity of the crystals? A melting point B colour of crystals C size of crystals D solubility 4. The proton number of helium is 2. What information does this give about helium? A. Its atom has two electrons. B Its atom is twice as heavy as a hydrogen atom. C It is a Group II element. D Its molecule has two atoms. 5. In which of the following are the particles arranged in a regular pattern? A a gas B a liquid C a metal D a solution 6. An element S has the proton number 18. The next element in the Periodic Table is an element T. Which statement is correct? AElement T has one more electron in its outer shell than element S. B Element T has one more electron shell than element S. C Element T is in the same group of the Periodic Table as element S. D Element T is in the same period of the Periodic Table as element S 7. Which numbers are added together to give the nucleon number of an ion? A number of electrons + number of neutrons B number of electrons + number of protons C number of electrons + number of protons + number of neutrons D number of protons + number of neutrons 8. Chromatography and fractional distillation can be used to separate compounds. In which type of separation is a thermometer needed for checking that complete separation hasoccurred? A chromatographic separation of two colourless solids B chromatographic separation of two solids of different colours C fractional distillation of two colourless liquids D fractional distillation of two liquids of different colours 9.in an experiment, a student needs to measure out 36.50 cmof a solution. Which piece of apparatus would measure this volume most accurately? A beaker B burette C measuring cylinder D pipette 10. At room temperature, in which substance are the particles furthest apart? A H2 B H2O C Mg D MgO SECTION B 1. Zinc is an element. State the meaning of the term element. ..................................................................................................................................... ................................................................................................................................. [1] 2. Sodium chloride and iron (III) hydroxide are both compounds. Explain the meaning of the term compound. ......................................................................................................................................... .................................................................................................................................... [2] 3. Magnesium is in group II of the Periodic Table. (i) Draw a diagram to show the electronic structure of magnesium. (ii) Explain what happens to the magnesium atom when it reacts and forms a Magnesium ion. ............................................................................................................................... [3] iii) Water purity is important in everyday life. Describe one area of everyday life where purity of substances is important. ………………………………………………………………………………………………………………………………………………………………………………………………………………………… [1] 4. Calcium and other minerals are essential for healthy teeth and bones. Tablets can be taken to provide these minerals. Healthy Bones Each tablet contains calcium magnesium zinc copper boron Boron is a non-metal with a macromolecular structure. (i) What is the valency of boron? ........................................................................... (ii) Predict two physical properties of boron. .................................................................................................................................. .................................................................................................................................. (iii) Name another element and a compound that have macromolecular structures. Element ………………….. Compound ……………………… (iv) Sketch the structure of one of the above macromolecular substances. [7] 5. A student collected some water from a polluted river. The water contained soluble solids and insoluble clay and had a pH of 5. (a) How can the student separate the clay from the rest of the river water? ……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………[2] (b) The student uses litmus paper to show that the river water is acidic. What will be the result of this test? …………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………..[2] 6. Name the main substance in natural gas. …………………………………………………………………………………………………………….[1] (b) What is the normal temperature of boiling water? …………………………………………………………………………………………………………….[1] 7. Three of the halogens in Group VII are: chlorine bromine iodine (a) (i) How does their colour change down the Group? …………………………………………………………………………………………………………..[1] (ii) How does their physical state (solid, liquid or gas) change down the Group? ………………………………………………………………………………………………………….[1] (iii) Predict the colour and physical state of fluorine. Colour …………………………………………………………………………………………………. Physical state ……………………………………………………………………………………. [2] (b) 0.015 moles of iodine react with 0.045 moles of chlorine to form 0.030 moles of a singleproduct. Complete the equation. I2 + Cl2 …………………………………………………………………………… [2] (c) Traces of chlorine can be separated from bromine vapour by diffusion. Which gas would diffuse the faster and why? …………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………..[2] 8. Use your copy of the periodic table to help you answer these questions. (a) Predict the formula of each of the following compounds. (i) barium oxide…………………………………………………………………………………… [1] (ii) boron oxide……………………………………………………………………………………. [1] (b) Give the formula of the following ions. (i) sulphide………………………………………………………………………………………… [1] (ii) gallium…………………………………………………………………………………………. [1] (c) Potassium and vanadium are elements in Period IV. (i) State two differences in their physical properties. …………………………………………………………………………………………………………………………………………………………………………………………………………………………… [2] (ii) Give two differences in their chemical properties. …………………………………………………………………………………………………………………………………………………………………………………………………………………………… [2] (d)Fluorine and astatine are halogens. Use your knowledge of the other halogens to Predict the following: (i) The physical state of fluorine at r.t.p. ………………………………………………………………………………………………………………The physical state of astatine at r.t.p ………………………………………………………………………………………………………….. [2] (ii) Two similarities in their chemical properties ……………………………………………………………………………………………………………………………………………………………………………………………………………………………[2] 9. The Kinetic Theory explains the properties of matter in terms of the arrangement and movement of particles. (a) Nitrogen is a gas at room temperature. Nitrogen molecules, N2, which are spread far apart move in a random manner at high speed. (i) Draw a diagram showing the arrangement of the valency electrons in a nitrogen molecule. Use × to represent an electron from a nitrogen atom. [2] (ii) How does the movement and arrangement of the molecules in a crystal of nitrogen differ from those in gaseous nitrogen? ................................................................................................................................... ................................................................................................................................... ............................................................................................................................... [3] (b) Use the ideas of the Kinetic Theory to explain the following. (i) A sealed container contains nitrogen gas. The pressure of a gas is due to the molecules of the gas hitting the walls of the container. Explain why the pressure inside the container increases when the temperature is increased. ................................................................................................................................... .............................................................................................................................. [3] 10. The diagram below shows the elements in a period of the Periodic Table. Li Be B C N O F Ne (a) To which period of the Periodic Table do these elements belong? .................................................................................................................................... [1] (b) Answer these questions using only the elements shown in the diagram. Each element can be used once, more than once or not at all. Write down the symbol for the element which (i) has six electrons in its outer shell. ....................................... (ii) is a halogen. ....................................... (iii) is a metal which reacts rapidly with cold water. ....................................... (iv) has two forms, graphite and diamond. ....................................... (v) is in Group II of the Periodic Table. ....................................... (vi) makes up about 80 % of the air. ................................. [6] (c) Complete the following sentence using words from the list below. atoms electrons molecules neutrons protons The................................of the elements in the Periodic Table are arranged in order of increasing number of ................................................................................................ . [2] 11. Complete the symbol equation for the reaction of calcium oxide with hydrochloric acid. CaO + ...............HCl→ CaCl2 + ............... [2] (v) State the chemical name of the compound CaCl2. .............................................................................................................................. [1]
Posted on: Thu, 11 Jul 2013 18:37:40 +0000
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