32 b.8 d‚2 e.64 :c 1 a.O Select the letter of the best atoner below. 1 Which of the following is the correct Lewis diagram for corbon? Knowledge and Understanding Chapter 1 B : Na Chapter 1 Elements and the Penindic Table. MHR 45 Si: Lewis diagrams. Drase rhe correct Lewis diagram for each element. a. .• b. . c. 9. Explain what is incorrect about each of the folloss’ing d. the attractive forces among the protons are less than the repulsive forces
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Anions are negatively charged ions. An anion has more electron than protons. The nature and magnitude of charge on ion depend on the position of an element in the periodic table. In forming an ion‚ an atom of a main group element loses gains electrons to obtain the electronic configuration of the noble gas closest to it in the periodic table. This gives the ion on especially stable electronic arrangement with a completely filled shell of electrons; that is‚ the electrons completely fill the shell farthest
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Candidate name…………………………………………………………………….. MINISTRY OF EDUCATION MASALA SECONDARY SCHOOL BOARD MOCK EXAMINATION 2014 SCIENCE 5124/3 PAPER 3 (CHEMISTRY) 1hour 15minutes Additional materials: Monday 30th July 2014. Answer paper INSTRUCTIONS TO CANDIDATES Write your name‚ centre number and candidate number at the top of this page all separate Attempt all questions in SECTION A and only TWO questions in SECTION B SECTION A (45 marks)
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UNIT 1 MATTER‚ CHEMICAL TRENDS AND CHEMICAL BONDING UNIT 1 MATTER AND CHEMICAL BONDING 1.1 The Study of Chemistry Chemistry is the study of matter and its properties‚ the changes (chemical‚ physical‚ and nuclear) that matter experiences‚ and the energy that is associated with these changes. The term STSE refers to science‚ technology‚ society‚ and the environment. These four areas are
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teaspoon of sodium chloride (NaCl) into the beaker‚ determine the mass and record in the table (row 1). 3. Repeat steps 1-2 for CaCO3 4. Repeat steps 1-2 for H2O 5. Use a clean and dry evaporating dish instead of a beaker to repeat steps 1-2 for ethanol C2H6O 6. Complete the data table by performing the following calculations on a separate sheet: Row 2: Determine the molar mass of each compound (check the periodic table…) Row 3: Determine the amount of mol you scooped for each sample grams (row 1) x 1
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PRACTICE EXAMINATION QUESTIONS FOR 1.1 ATOMIC STRUCTURE (includes some questions from 1.4 Periodicity) 1. (a) Complete the following table. |Relative mass|Relative charge| Neutron||| Electron||| (2) (b) An atom has twice as many protons as‚ and four more neutrons than‚ an atom of 9Be. Deduce the symbol‚ including the mass number‚ of this atom. ..................................................................................................................................... (2) (Total
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compounds that we have learnt this unit. Your audience will be students beginning their grade ten who have minimal knowledge on writing chemical formulas. They are able to: • Read the periodic table and identify metals‚ metalloids‚ and non‐metals • Identify polyatomic‚ but don’t have them memorized • Read the oxidation states (charges) on the periodic table However‚ you should assume that they have no knowledge on ionic and covalent bonds‚ criss‐cross rule‚ prefixes‚ acids‚ and adding or subtracting oxygen atoms from polyatomic ions
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The transition metals are placed in the centre of the periodic table‚ between groups 2 and 3. They are generally hard and dense‚ and less reactive than the alkali metals. Iron‚ copper‚ silver and gold are important transition metals. The transition metals: overview The elements in the centre of the periodic table‚ between groups 2 and 3‚ are called the transition metals. Most of the commonly used metals are there‚ including iron‚ copper‚ silver and gold The transition metals Common properties
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Iron‚ Lead‚ Manganese‚ Nickel‚ Silver‚ and Zinc are all chemical elements. Chromium‚ Copper‚ Iron‚ Manganese‚ Nickel‚ Silver‚ and Zinc which are yellow on the periodic table are considered transitional metals. Aluminum and Lead which are light blue on the periodic table are considered other metals. Arsenic which is dark pink on the periodic table is considered metalloids. All heavy metals exist in surface water in colloidal‚ particulate‚ and dissolved phases‚ although dissolved concentrations are generally
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the electronic structure of atoms and how knowing the electronic structure of the atoms aid in the prediction of chemical reactions. Halogens and Alkali Metals compared to Noble gases “In the 1870’s‚ the Russian chemist Mendeleev developed the periodic table‚ based upon the relationship between the atomic weights of the elements and their chemical properties‚” (Wetzel‚ 1993). The reason that halogens and alkali metals are extremely reactive while the noble gases are not reactive has to do with the
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