NATIONAL CERTIFICATE (VOCATIONAL) PHYSICAL SCIENCE (Second Paper) NQF LEVEL 2 SUPPLEMENTARY EXAMINATION 2010

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09:00 12:00 A non-programmable scientific calculator may be used.

1 NATIONAL CERTIFICATE (VOCATIONAL) PHYSICAL SCIENCE (Second Paper) NQF LEVEL 2 SUPPLEMENTARY EXAMINATION 2010 ( ) 11 March (X-Paper) 09:00 12:00 A non-programmable scientific calculator may be used. This question paper consists of 9 pages, a periodic table and 2 pages answer sheet.

2 ( ) -2- NC1800(E)(M11)V TIME: 3 HOURS MARKS: 150 INSTRUCTIONS AND INFORMATION Write your name and/or examination number (and centre number if applicable) in the space provided on the ANSWER SHEET and ANSWER BOOK. Answer SECTION A on the attached ANSWER SHEET. Answer SECTION B in the ANSWER BOOK. Answer ALL the questions. Read ALL the questions carefully. Number the answers according to the numbering system used in this question paper. All final answers must be accurately approximated to TWO decimal places. Write neatly and legibly.

3 ( ) -3- NC1800(E)(M11)V SECTION A: Answer this section on the attached ANSWER SHEET. QUESTION 1: ONE-WORD ANSWERS Choose the correct word(s) from those given in brackets. Write only the word(s) next to the question number ( ) in the ANSWER BOOK (Corrosion/Precipitation) is a process through which metals are destroyed by chemical reactions. A decrease in temperature (increases/decreases) the average kinetic energy of colliding molecules. A chemical compound that allows soap to form lather and remove permanent hardness in water is (Na 2 CO 3 /Na 3 CO 2 ). The sum of the total number of protons and neutrons in the nucleus of an atom is called (atomic number/mass number). (Oxidation/Reduction) is the process by which a metal reacts with oxygen. [5]

4 ( ) -4- NC1800(E)(M11)V QUESTION 2: MATCHING ITEMS Choose an item from COLUMN B that matches a description in COLUMN A. Write only the letter (A H) next to the question number ( ) on the attached ANSWER SHEET. COLUMN A COLUMN B 2.1 Aquifer A strong electrolyte Copper NaCl solution Nutrients B C water that is rich in nutrients but low oxygen content an underground rock structure to store water 2.5 Eutrophication D a process of removing salt from sea water E has very good thermal and electrical properties F a material which neutralises the properties of an acid G a neutral subatomic particle H nitrates and phosphates [5] QUESTION 3: TRUE OR FALSE STATEMENTS Indicate whether the following statements are TRUE or FALSE. Choose the answer and write only 'true' or 'false' next to the question number ( ) in the ANSWER BOOK. If the statement is FALSE, write down the correct statement A homogenous mixture has all the constituents in the same phase.. CaSO4 is called Epsom salts and has several medicinal uses. Core electrons are found in the last occupied energy level. Fractional distillation is a method used to separate parts of a mixture with different boiling points. Protons are positively charged subatomic particles. [10]

5 ( ) -5- NC1800(E)(M11)V QUESTION 4 MULTIPLE-CHOICE QUESTIONS Various options are given as possible answers to the following questions. Choose the answer and make a cross (X) in the block next to the question number ( ) on the attached ANSWER SHEET. 4.1 The chemical formula for Epsom salts is A B C D CaCO 3 MgCO 3 MgSO 4 CaCl is the name of the process which separates mixtures based on their colour. A B C D Filtration Distillation Chromatography Precipitation 4.3 Gypsum is also known as A B C D Plaster of Paris Caustic soda Washing soda Washing powder 4.4 The arrangement of electrons in an atom is 2: 8: 1. How many valence electrons does this atom have? A B C D The name given to the amount of substance that contains the same number of particles as the same number of atoms in 12 grams of carbon atoms is A B C D mole. molarity. molecule. molality. [15] TOTAL SECTION A: 35

6 ( ) -6- NC1800(E)(M11)V SECTION B INSTRUCTIONS AND INFORMATION Answer this section in the ANSWER BOOK. In ALL calculations, formulae and substitutions must be shown. Round off all answers to TWO decimal places. QUESTION 5: MATTER AND MATERIALS 5.1 Define the following terms: Energy Heat 5.2 Explain the following terms: Electrical insulator Non-magnetic materials Give FOUR properties of metals. Metalloids are substances that do not fall under metals or non-metals. Give the names of FOUR metalloids. (4) (4) [12] QUESTION Make a neat, labelled sketch of sodium atom with an atomic number of 11 and an atomic mass of 23. Answer the following questions with respect to a helium atom: (6) Identify the total number of electrons as well as protons in this atom. Write down the electronic configuration of this atom. 6.3 Radioactive isotopes are very useful in medicine for the treatment of cancer Define the term isotope. Explain the differences between the following hydrogen isotopes 1 H 1 ; 2 H 1 ; 3 H 1 [17]

7 ( ) -7- NC1800(E)(M11)V QUESTION 7 In the periodic table elements are arranged in rows and columns according to the atomic numbers of elements. 7.1 Define the following terms: Group Atomic number The groups in the periodic table of elements are known by different names. State the name of group 7. Identify and write down the name of a non-metallic element which is important for normal respiration and combustion. This element is found in period 2 and group 6 of the periodic table. Classify the following elements as either metals or non-metals: Hydrogen Cobalt 7.5 Define the following terms: Ions Molecules 7.6 Write the chemical formula of the following compounds Sodium chloride Sulphuric acid [16] QUESTION 8: CHEMICAL CHANGE 8.1 Different separation techniques are used to separate mixtures Explain the difference between chemical and physical change. Explain the term solute. 8.2 Identify separation techniques you will use to separate the following mixtures: A mixture of sea water and sand Pure ethanol from beer A mixture of CaCl2 from NaHCO3 A mixture of cooking oil from water [8]

8 ( ) -8- NC1800(E)(M11)V QUESTION State the law of conservation of energy. State THREE ways in which heat is transferred through objects. Convert 45 C to Kelvin. State THREE thermodynamic properties of temperature. 3 kj of heat energy is needed to raise the temperature of 100 g of a liquid by 20 C. Calculate the specific heat capacity of the liquid in J/kg/ C. (4) [14] QUESTION Hydrolysis of salts is often a good source of electrolyte. Illustrate this by an equation which explains the dissociation of sodium hydroxide in water. A more reactive metal will always displace a less reactive metal from an aqueous solution of its salt. Complete and balance the following displacement equations. (4) Fe(s) + CuSO Zn(s) + FeSO Calculate the formula mass of the following compounds: CH 4 NH Calculate the number of moles of 32,4 g NaNO3. 10 g of NaOH is dissolved in 500 cm 3 of water. Calculate the concentration of this solution. (4) [21]

9 ( ) -9- NC1800(E)(M11)V QUESTION 11: CHEMICAL SYSTEMS AND INDUSTRY 11.1 Describe how water changes its physical state as it moves through the hydrologic cycle (water cycle) and explain how energy gets transferred to and from the water during this cycle. (6) Explain why plants play an important role in the water cycle. Oil is considered as one of the main pollutants in our oceans and rivers. Explain why an oil spillage is detrimental to the above. What are the after effects of acid rain? [14] QUESTION Explain how you can identify whether water is hard or soft. Indicate why calcium carbonate is insoluble in pure water but soluble in rain water. Write down a balanced reaction equation which shows how temporary hardness in water is removed by boiling. Give the formula of washing soda and explain how it removes permanent hardness in water. (5) (4) [13] TOTAL SECTION B: 115 GRAND TOTAL: 150

10 ( ) -10- NC1800(E)(M11)V

11 ( ) -11- NC1800(E)(M11)V ANSWER SHEET EXAMINATION NUMBER: NATIONAL CERTIFICATE (VOCATIONAL) PHYSICAL SCIENCE PAPER 2 LEVEL 2 ANSWER SHEET SECTION A QUESTION [5] QUESTION [5]

12 ( ) -12- NC1800(E)(M11)V ANSWER SHEET EXAMINATION NUMBER: NATIONAL CERTIFICATE (VOCATIONAL) PHYSICAL SCIENCE PAPER 2 LEVEL 2 ANSWER SHEET QESTION [10] QUESTION A B C D 4.2 A B C D 4.3 A B C D 4.4 A B C D 4.5 A B C D (5 3) [15] TOTAL SECTION A: 35

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