1. (i) OR 153 Eu has 90 neutrons AND 151 Eu has 88 neutrons
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1 . (i) 53 Eu has () more neutrons 53 Eu has 90 neutrons AND 5 Eu has 88 neutrons ALLOW There are a different number of neutrons IGNE Correct references to protons / electrons DO NOT ALLOW Incorrect references to protons / electrons (It has the) same number of protons AND electrons Both have 63 protons and 63 electrons ALLOW Same number of protons AND same electron configuration DO NOT ALLOW Same number of protons without reference to electrons (and vice versa) []. (a) Mass of the isotope compared to /th mass of the atom compared to /th (the mass of a) carbon- C (atom) IGNE Reference to average weighted mean (i.e. correct definition of relative atomic mass will score both marks) ALLOW mass of a mole of the isotope/atom with /th the mass of a mole g of carbon- for two marks. ALLOW marks for: Mass of the isotope mass of the atom compared to C atom given a mass of.0 i.e. given a mass of C is communicates the same idea as /th. ALLOW C C ALLOW marks for: mass of the isotope mass of /th mass of carbon i.e. fraction is equivalent to compared to ALLOW mark for a mix of mass of atom and mass of mole of atoms, i.e. mass of the isotope/mass of an atom compared with /th the mass of a mole g of carbon-. DO NOT ALLOW mass of ions mass of element Plymstock School
2 (b) ( ) + (53 5.3) (calculator value) A r = 5.04 ALLOW Correct answer for two marks ALLOW One mark for ECF from transcription error in first sum provided final answer is to decimal points and is to between 5 and 53 and is a correct calculation of the transcription [4] 3. (i) (atoms of the) same element same atomic no. no. of protons AND with different numbers of neutrons different masses IGNE same number of electrons DO NOT ALLOW different numbers of electrons DO NOT ALLOW different relative atomic masses DO NOT ALLOW elements with different numbers of neutrons without mention of same protons same atomic number same (number of) electrons (in the outer shell) same electron configuration structure DO NOT ALLOW different number of protons IGNE same number of protons IGNE they are both carbon they are both the same element Plymstock School
3 (iii) mass of the isotope compared to /th mass of the atom compared to /th (the mass of a) carbon- C (atom) IGNE reference to average weighted mean (i.e. correct definition of relative atomic mass will score both marks) ALLOW mass of a mole of the isotope/atom with /th the mass of a mole g of carbon ALLOW marks for: mass of the isotope mass of the atom compared to C atom given a mass of.0 i.e. given a mass of communicates the same idea as /th. ALLOW C C ALLOW F MARKS: mass of the isotope mass of /th mass of carbon i.e. fraction is equivalent to compared to ALLOW MARK F a mix of mass of atom and mass of mole of atoms, i.e.: mass of the isotope/mass of an atom compared with /th the mass of a mole g of carbon. [4] 4. (i) protons neutrons electrons 4 Mg 5 Mg 3 4 Mg line correct 5 Mg line correct mark by row Plymstock School 3
4 A r = 4.33 (to 4 sig figs) ALLOW two marks for A r = 4.33 with no working out ALLOW one mark for ecf from incorrect sum provided final answer is between 4 and 6 and is to 4 significant figures, e.g gives ecf of 4.3 (iii) The (weighted) mean mass of an atom (weighted) average mass of an atom relative to / th (the mass) of (one atom of) C ALLOW The (weighted) mean mass (weighted) average mass of an atom average atomic mass compared with (the mass of) carbon- which is For st marking point, ALLOW mean mass of the isotopes average mass of the isotopes Do NOT ALLOW the singular: isotope ALLOW mass of one mole of atoms compared to / th (the mass) of one mole / g of carbon- mass of one mole of atoms / th the mass of one mole / g of carbon- 3 [7] 5. (i) atoms of the same element with different numbers of neutrons/different masses () 79 Br 35 protons, 44 neutrons, 35 electrons () 8 Br 35 protons, 46 neutrons, 35 electrons () (iii) (s )s p 6 3s 3p 6 3d 0 4s 4p 5 () [4] Plymstock School 4
5 6. Molar mass of anhydrous calcium nitrate = 64. g mol () Ratio Ca(NO 3 ) : H O = 69.50/64. : 30.50/8 or :.694 or : 4 () Formula = Ca(NO 3 ) 4H O () [3] 7. (a) (atoms of) same element/same atomic number.. with different numbers of neutrons/different masses (b) 3 isotope percentage composition number of protons neutrons electrons 85 Rb 7 to Rb 7 to mark must add up to ie mark for each atomic structure; for % compositions. A r (85 7) + (87 8) = /85.56 = 85.6 nd mark for significant figures 7/9: = /7: = 85.5 (c) carbon-/ C [7] Plymstock School 5
6 8. (i) accelerating... ionisation deflection to the pump... detection protons neutrons electrons 5 Mg 3 6 Mg 4 s s p 6 3s / / + 6.9/ (iii) = 4.33 (calc value: This scores one mark) 4.3 with no working, award mark only. 4.3 with no working, no marks (Periodic Table value) [5] 9. (i) (atoms of) same element/same atomic number/number of protons with different numbers of neutrons/diff masses proton neutron electron relative mass 840 / negligible relative charge + 0 i.e. mark for each correct row for electron, accept /500 /000 for charges, accept +; 0; [3] Plymstock School 6
7 0. (i) average atomic mass/weighted mean/average mass compared with carbon- /th of mass of carbon-/on a scale where carbon- is The mass of mole of atoms of an element compared with g of carbon- 3 A r = ( 57.) + (3 4.79) /.8558 =.9 [5]. isotope protons neutrons electrons C C []. (i) mass spectrometry mass of an isotope compared with carbon- /th of mass of carbon-/on a scale where carbon- is mass of mole of the isotope/mass of mole of carbon- is equivalent to the first mark mass of the isotope that contains the same number of atoms as are in mole of carbon- mark (mark lost because of mass units) (iii) 95/ + 3 5/.05 =. (mark for significant figures) (. scores both marks) [5] 3. (a) (i) atoms of same element/same atomic number.. with different numbers of neutrons/different masses isotope protons neutrons electrons 46 Ti 4 47 Ti 5 Plymstock School 7
8 (46 8.9) + (47 9.8) + (48 8.3) (b) A r = / = 47.7 [5] 4. (i) 79 Br has two less neutrons than 8 Br 79 Br have same numbers of protons and same number of electrons [4] 5. isotope protons neutrons electrons nickel nickel nickel For ecf, 3rd column same as first column. [3] 6. (i) mass spectrometry mass spec /mass spectrometer should also be credited average mass/weighted mean mass of an atom compared with carbon- /th of mass of carbon-/on a scale where carbon- is mass of mole of atoms (of an element) mass of mole of 3 carbon- is equivalent to first two marks mass of the element that contains the same number of atoms as are in mole of carbon- marks (mark lost because of mass units) (iii) / / / = 63.5 (mark for significant figures) (iv) copper/ Cu [7] Plymstock School 8
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