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An atom is the smallest unit which forms the basis of innumerable chemical properties that are exhibited by an element. The scope of reactions although primarily influenced by the interaction of electrons, the number of protons differentiates an element from every other element. Neutrons, although not changing the chemical properties radically, do however play a ...
Atomic number, Mass number and Isotopes Section A For each of the questions only one of the lettered responses (A-D) is correct. Select the correct response in each case and mark its code letter by connecting the dots as illustrated on the answer sheet. Which one of the following statements is not true about the ...
Atomic Structure Electrons, protons and neutrons as the constituent particles of the atom. Their location in the atom, their relative masses and charges. Atomic number, mass number and isotopes. When you have finished this section you should be able to: Describe the properties of protons, neutrons and electrons in terms of their relative charge and ...
What mass of material is there in each of the following? (a) 2.00 mol of SO3 molecules (b) 0.0300 mol of Cl atoms (c) 9.00 mo1 of SO42- ions (d) 0.150 mol of MgSO4.7H2O molecules [4] What amount of each substance is contained in the following? (a) 31.0 g of P4 molecules ...
SECTION A 1. Iodate ions in the presence of acid oxidise sulphite ions to sulphate ions. Which one of the following equations correctly represents this reaction? A IO3- + 2SO32- + 2H+ I2 + 2SO42- + H2O B 2IO3- + SO32- + 2H+ I2 + SO42- + H2O C 2IO3- + 5SO32- + 2H+ I2 ...
Section A 1. 10 cm3 of a gaseous hydrocarbon needed 30 cm3 of oxygen for complete combustion and 20 cm3 of carbon dioxide were produced. What is the molecular formula of the hydrocarbon? A CH4 B C2H2 C C2H4 D C2H6 2. What mass of iodine will be produced if 200 cm3 of chlorine gas ...
CALCULATIONS FROM EQUATIONS Amounts of substances, the mole , molar mass, molar volume of gases (24 litre/dm3) at room temperature and pressure, the Avogadro constant and their use in calculations. (Determination of the Avogadro constant is not required.) A major problem confronting a chemist when carrying out reactions is to try and understand what they ...
