Edexcel 1 Welcome to your Edexcel 1 Isotopes have similar chemical properties because they have the same... Electronic structure Average mass Molecular mass Atomic mass Three isotopes of a newly discovered element X are 117-X (relative abundance 3), 119-X (relative abundance 5) and 121-X (relative abundance 7). What is the relative atomic mass of element X? 119.5 0.179 120 118.3 The atomic mass of the ion of an element A+ is 23 and it has 10 electrons. How many protons, neutrons and electrons are present in the neutral atom A? 11 protons, 12 neutrons, 11 electrons 11 protons, 12 neutrons, 10 electrons 10 protons, 13 neutrons, 10 electrons 12 protons, 11 neutrons, 11 electrons One mole of gaseous atoms forms one mole of gaseous ions with a single positive charge in __________? First ionisation energy Second ionisation energy Third ioniation energy Ionisation energy of a gas Why does helium have higher first ionisation energy than hydrogen? Helium has one more proton Helium has one more electron Helium has one more neutron Helium has one more shell Which of the following statements about ionic compounds is true? The smaller the ions, the higher the melting point They do not conduct electricity in any state They are formed by electron sharing They are malleable Which of the following best describes the result of X-ray diffraction of hydrogen? High concentration of negetive charge between the two nuclei High concentration of positive charge between the two nuclei Equal concentration of negative charge around the two nuclei Highly dense positve centre with equal distribution of negative charge around them Which of the following statements is correct?I. Polar molecules are symmetricalII. Non-polar molecules can contain polar bondsIII. Van der Waals forces occur due to temporary dipoles II and III only I, II and III I and III only I and II only What type of bonding exists in ammonium chloride (NH4Cl)? Ionic, covalent, dative covalent Ionic, covalent Ionic, dative covalent Covalent, dative covalent The bond angle in chlorine trifluoride (ClF3) is approximately equal to? 89 degrees 107 degrees 120 degrees 104.5 degrees All uncombined elements have an oxidation number of? Zero 1 -1 2 If the oxidising agent in an experiment is bromine water, then it can be classified as? An electron acceptor An electron donor An isotope A transition element When sulphur dioxide is formed from sulphate ions, what is the change in oxidation number of sulphur? +6 to +4 +4 to+6 no change +4 to 0 What happens to a reactant in a disproportionation reaction? It oxidises and reduces It oxidises only It reduces only It breaks into elements The oxidation number of carbon in carbonate ion is? +4 -4 +2 -6 Which of the following is correct about barium? Barium hydroxide is soluble in water Barium is less reactive than calcium Barium sulphate is soluble in water All the options are correct What is the reaction called in which chlorine reacts with sodium hydroxide to form sodium chlorate (I)? Disproportionation Oxidation Reduction Displacement Which of the following is incorrect about magnesium? Magnesium reacts with steam to produce magnesium hydroxide Magnesium has a shorter atomic radius than calcium Hydroxide of magnesium is insoluble in water Magnesium has a higher melting point than barium Which of the following reacts with potassium bromide to give a yellow solution? Aqueous chlorine Aqueous fluorine Aqueous iodine Aqueous silver nitrate Which halide ion gives a pale yellow precipitate with silver nitrate? Iodide ion Fluoride ion Chloride ion Bromide ion Relative atomic mass is the average mass of one atom compared to one-twelfth of the mass of one atom of? Carbon-12 He H Carbon-4 What is the concentration of the solution when 16g of sodium chloride is dissolved in 250 cubic centimetres of water? 1.09M 0.9 M 0.001M 0.1M Calculate the mass of nitrogen gas that has a pressure of 100 kPa, temperature of 25 degrees centigrade, and a volume of 500 cubic centimetres? (R = 8.31) 0.56g 1g 0.0202g 0.2g Avogadro's Constant can be used for? Atoms, molecules and ions Atoms and ions only Atoms and molecules only Molecules and ions only How many atoms of magnesium are present in an 18g sample of magnesium metal? 4.5x10<sup>23</sup> 6.022x10<sup>23</sup> 4x10<sup>22</sup> 0.75x10<sup>23</sup> The bond angle in chlorine trifluoride (ClF3) is approximately equal to? 89 degrees 107 degrees 120 degrees 104.5 degrees Time is Up!