c Grade 9 Angel International School - Manipay 1 st Term Examination November, 2016 Chemistry Duration: 01:30 Hours Index No:- PART I Underline the correct answers 1) Identify the correct statement about mixtures. a) Mixtures contain two or more substances. b) Substances in mixtures are not bonded together. c) Mixtures can easily be separated d) All of the answers are correct. 2) Recall the name of the scientist who developed this model of the atom a) Ernest Rutherford b) J.J. Thompson c) Niels Bohr d) Philip Lenard 3) Define an element. a) An element is a substance that has been broken down. b) An element is any substance that we use, such as sugar in a cake c) An element is an absolutely pure substance that cannot be broken down into other substances. d) An element is a pure substance that we use in a mixture to make things. 4) The diagrams show four particles. Which two diagrams show atoms that are isotopes of each other? a) 1 and 2 b) 1 and 3 c) 2 and 3 d) 2 and 4 1
5) Which two methods can be used to separate a salt from its solution in water? 1. Crystallization 2. Decanting 3. Distillation 4. Filtration a) 1 and 2 b) 1 and 3 c) 2 and 3 d) 3 and 4 6) Which statements about a phosphorus atom are correct? 1. The nucleon number is 16. 2. The number of outer electrons is 5. 3. The proton number is 15. a) 1, 2 and 3 b) 1 and 2 only c) 1 and 3 only d) 2 and 3 only 7) A student sets up the apparatus for fractional distillation as shown below. What error is the student making in setting up the apparatus? a) The thermometer is in the wrong position. b) There should not be a bung in the top of the fractionating column. c) Water enters and leaves the condenser in the wrong place. d) There should be a bung in the top of the receiver. 8) What are the gasses in planet of Saturn? a) Hydrogen, helium b) Carbon dioxide, methane 9) Identify what the chemical structure shown here represents. a) Compound b) Element c) Lattice d) molecule c) Carbon dioxide, hydrogen d) None of the above 10) Why Saturn is describe as a most beautiful planet of solar system? a) Mysterious ring b) Snow storm c) Colorful rainbow d) Has 4 moons with colorful rings 11) The diagram shows the result of dropping a purple crystal into water. Which processes take place in this experiment? 2
12) How to called the production of methane by bacterial decay of domestic waste? a) Fossilization c) Anaerobic decay b) Fermentation d) None of the above 13) Green house gasses are. a) Carbon dioxide c) Sulphur dioxide and carbon dioxide b) Carbon dioxide and nitrogen d) Carbon dioxide and methane 14) In this diagram of an atom, identify the correct labels for A, B, C and D respectively. a) Electron, neutron, proton and nucleus b) Electron, proton, neutron and electron shell c) Electron, proton, neutron and nucleus d) Electron shell, neutron, proton and nucleus 15) Which is the fuel never emit the pollution and polluted gasses a) Petrol b) Sun energy c) Coal d) Hydrogen 16) Find the electronic configuration of a noble gas. a) 2,8,8 b) 2,9,3 c) 2,8,2 d) 2,8,1 17) What is the Latin name of silver? a) Kalium b) Aurum c) Argentums d) Silium 18) Identify the atom in this diagram. a) Lithium b) Beryllium c) Helium d) Boron 19) What is the main different between the modern and simple purification method? a) Sewage treatment b) Ozone pump c) Chlorination d) Ozone treatment and fluorination 20) Find, which of the following are in liquid state? matter Boiling point Boiling point 0 C 0 C P 1083 2600 Q -117 78 R 0 100 S -219-183 a) P and Q b) Q and R c) R and S d) Q and S 3
21) Which is not an example for Brownian motion? a) Smoke cells show a random motion b) Bromine vapor diffuses c) Ammonia and hydrochloric acid fumes diffuse d) Metal melt by heat 22) The element boron has an atomic number of 5 and a mass number of 11. Identify the correct representation of this atom. 1 2 3 a) 4 b) 1 c) 2 d) 3 23) Which separation method is used to separate the two or more solid in a liquid? a) Chromatography b) Decantation c) Centrifugation d) Fractional distillation 24) Identify what this diagram represents. a) An impure substance b) A compound c) A pure lattice d) An element 25) Which radioisotope is used to treat internal cancer tumors? a) Cobalt -60 b) Carbon -14 c) Hydrogen -03 d) Vanadium- 52 26) Which radio isotope has very short half-life? a) Cobalt -60 b) Carbon -14 c) Hydrogen -03 d) Oxygen -14 27) What are the uses of carbon -14 isotopes? a) Date the wooden and organic objects b) Used in nuclear power station c) Check the thickness of sheets of plastic d) Sterilized medical instruments and syringes 28) Chlorine has two isotopes, chlorine -35 and chlorine-37. What is the (actual value) relative atomic mass of chlorine? a) 35 b) 37 c) 36 d) 35.5 29) Made from elements chemically bonded together is known as a) Mixture b) Compound c) Isotopes d) Radio isotopes 30) Recall what the different colored areas of this electron model represent a) They represent electrons in differing energy levels surrounding a nucleus b) They represent zones of neutrons surrounding the nucleus c) They represent zones of protons surrounding the nucleus. d) They represent thousands of electrons surrounding the nucleus. 4
31) Fuels are releasing energy when they are burning. Which fuel releases less energy when it is burning? a) Methanol c) Carbon mono oxide b) glucose d) Hydrogen 32) Find the correct equation for formation of slaked lime. a) CaCO 3 + H 2 O Ca(OH) 2 + CO 2 b) CaCO 3 CO 2 + CaO c) CaO + H 2 O Ca(OH) 2 d) Ca(OH) 2 + H 2 O CaO + CO 2 33) What are the early atmospheric gasses? a) Methane,carbon dioxide, ammonia, steam b) Methane,carbon dioxide, nitrogen, oxygen c) Hydrogen, carbon dioxide, nitrogen d) Water, Methane,carbon dioxide, ammonia 34) What is the function of catalytic converter in a vehicle? a) Remove lead b) Prevent smoke c) Remove impurity d) Give more energy Use the table for answering questions from 27 29 Element Protons neutrons electrons A 17 18 17 B 18 18 18 C 11 12 11 D 17 20 17 E 16 22 17 35) Isotopes are a) A and B b) A and B c) C and E d) A and C 36) what is the positively charged ion a) A b) D c) E d) C 37) Noble gas is a) A b) D c) E d) C 38) noble gas is a) B b) D c) A d) E 39) A student carries out an experiment to determine the effect of different types of salt solutions on an iron nail. Identify the purpose of the test tube containing the nail and water only. a) This test tube acts as a control for the experiment. b) The water is added to test the strength of the nail. c) All of the answers are correct. d) This test tube allows a comparison between copper nitrate and copper sulfate 5
40) Two gas jars each contain a different gas. The gas jars are connected and the cover slips are removed. The diagram shows what happens to the particles of the gases. Which process has occurred? a) chemical reaction b) condensation c) Diffusion d) Evaporation (40 marks) PART -2 1) Choose only one from A and B A. Write the electronic configuration of the followings. a) Al : d) Ar :.. b) K :. e) S :.. c) Cl :.. (5marks) Select the ones belonging to the following categories from the given list of substance CCl 4, CuSO 4, Zn, Na, Cl, CO 2 1. A compound : 2. Dissolve in water :. 3. Mono valence element : 4. The most electro positive element : 5. Molecules : (5marks) (OR) B. Name the isotopes of the following elements 1. Hydrogen: (3marks) 2. Carbon: (3marks) 3. Neon:. (3marks) 4. Chlorine:.. (1mark) 2) The diagram shows parts of carbon cycle. This includes some of the processes that determine the percentage of carbon dioxide in the atmosphere. CARBON DIOXIDE IN THE ATMOSPHERE COMBUTION PHOTOSYNTHESIS RESPIRATION 6
a) Explain the term respiration and how this process increases the percentage of carbon dioxide in the atmosphere. b) Explain why the combustion of waste crop material should not alter the percentage of carbon dioxide in the atmosphere. c) In 1990 the percentage of carbon dioxide in the atmosphere was 0.032% and 2008 it was0.038% suggest an explanation for this increase. d) What are the three major problem coursed by carbon dioxide? (3marks) e) Write the equation for the formation of acid rain? (1mark) 3) Write the answer for the following questions. 1. Draw the limestone cycle and label the parts. (8marks) 2. Write 5 uses of limestone. (5marks) 3. How lime differs from a slaked lime? 4. Write 5 uses of hydrogen. (5marks) 5. State 5 advantages and disadvantages of hydrogen? (5marks) (25 marks) 4) The diagram blow shows the results of an experiment to identify the components of mixtures x and Y. Each mixture is known to contain one or more of single substances L, M, N, and P and no other substance. 5) 1. What is the name given in the experiment? (1marks) 2. What do the lines A and B represent on the diagram? 3. A student who did the same experiment used an ink pen to draw the start line instead of a pencil. How would this student s results have been different from the results shown in the diagram above/ explain your answer. 4. Use the diagram to deduce which of the substances L, M, N or P are present in Mixture X.. Mixture Y 5. What do you understand by the term R f value? (1mark) 6. Which of the substances L, M, N or P has a R f value of 0.45? Show how you obtained your answer? A. Choose only one from A and B 1. What is solution and what are the parts of solution? 2. How to separate the immiscible liquids? (1marks) 3. How to separate the miscible liquids? (1mark) 7
4. Fill in the blanks in following table. (6marks) Solvent water kerosene acetone OR Substance that dissolve Gloss paint Iodine crystals Gloss paint B. The apparatus below was used to distil the product obtained by fermenting sugar solution. Parts of the apparatus are labeled by a letter. Answer the questions that follow by referring to the letter on the diagram. 1. Name the piece of apparatus A. I. State why it is used 2. B is the thermometer. Of what is it measuring the temperature? (1mark) 3. Name the apparatus C. I. Why is it used? II. What goes in at D and out at E? (3marks) 4. Why is there an outlet at F? (1mark) 5. What is the use of fractional distillation? (1marks) 6. What are the industrial uses of this? ***** 8