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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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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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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Ce4+‚ Lu3+‚ Yb3+‚ Gd3+‚ Eu2+‚ Pu4+‚ U6+. 10. Why is thorium considered important from industrial view point? 11. What is the major source of Th? How is it extracted from this mineral? (Give guide only) 12. Discuss the position of Th and U in the Periodic table 13. Name two important minerals of uranium. Starting from one of these‚ outline a scheme for extraction of U and production of U3O8 14. Why is U deemed to be the key metal in nuclear industry? 15. How is UF6 produced? What is its importance? 16
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reacts with water. IntroductionAlkali metals are in the first column of the periodic table and they may be readily fused and volatilized with their melting and boiling points becoming lower with increasing atomic mass. They are the strongest electropositive metals. (Kerrod‚ R. 2009) These elements react vigorously‚ even violently with water. Alkaline Earth metals are elements in the second column of the periodic table. These elements are in general white‚ differing by shades of color or casts; they
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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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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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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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Titanium Ti Atomic Number: 22 Atomic Mass: 47.867 Protons:22 Electrons:22 Neutrons:26 8. Titanium is a metal and in the family of transition metals. It belongs to group 4 of the periodic table. 9. Titanium is a silver‚ lustre‚ low in density but is a strong metal. This metal forms a passive but protective oxide coating when exposed to elevated temperatures in air but at room temperatures it resists tarnishing. The most noted chemical property of Titanium is its excellent resistant
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can stored properly * chemicals can be handled properly * the situation of improper storage or handling can be dealt with quickly and safely 3.a) The atomic mass of an element on the periodic table is an average of the masses of the naturally-occurring isotopes. b) According to the periodic table‚ the average mass of boron is 10.8u. c) With an average mass of 10.8‚ and the choice being either boron-10 or boron-11‚ boron-11 should be most common because it is the nearest isotope to the
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