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</div><h2>HL Paper 1</h2><div class="question">
<p class="p1">Which quantities are the same for all atoms of chlorine?</p>
<p class="p1">I. Number of protons</p>
<p class="p1">II. Number of neutrons</p>
<p class="p1">III. Number of electrons</p>
<p class="p1">A. I and II only</p>
<p class="p1">B. I and III only</p>
<p class="p1">C. II and III only</p>
<p class="p1">D. I, II and III</p>
</div>
<h2 style="margin-top: 1em">Markscheme</h2>
<div class="question">
<p>B</p>
</div>
<h2 style="margin-top: 1em">Examiners report</h2>
<div class="question">
[N/A]
</div>
<br><hr><br><div class="question">
<p class="p1">The table below shows the number of protons, neutrons and electrons present in five species.</p>
<p class="p1"><img src="images/Schermafbeelding_2016-10-17_om_13.02.50.png" alt="M09/4/CHEMI/HPM/ENG/TZ2/05"></p>
<p class="p1">Which <strong>two </strong>species are isotopes of the same element?</p>
<p class="p1">A. X and W</p>
<p class="p1">B. Y and Z</p>
<p class="p1">C. Z and W</p>
<p class="p1">D. W and Q</p>
</div>
<h2 style="margin-top: 1em">Markscheme</h2>
<div class="question">
<p>D</p>
</div>
<h2 style="margin-top: 1em">Examiners report</h2>
<div class="question">
[N/A]
</div>
<br><hr><br><div class="question">
<p class="p1">What is the order of increasing energy of the orbitals within a single energy level?</p>
<p class="p1">A. <span class="Apple-converted-space"> </span>\({\text{d}} < {\text{s}} < {\text{f}} < {\text{p}}\)</p>
<p class="p1">B. <span class="Apple-converted-space"> </span>\({\text{s}} < {\text{p}} < {\text{d}} < {\text{f}}\)</p>
<p class="p1">C. <span class="Apple-converted-space"> </span>\({\text{p}} < {\text{s}} < {\text{f}} < {\text{d}}\)</p>
<p class="p1">D. <span class="Apple-converted-space"> </span>\({\text{f}} < {\text{d}} < {\text{p}} < {\text{s}}\)</p>
</div>
<h2 style="margin-top: 1em">Markscheme</h2>
<div class="question">
<p>B</p>
</div>
<h2 style="margin-top: 1em">Examiners report</h2>
<div class="question">
[N/A]
</div>
<br><hr><br><div class="question">
<p class="p1">Which species possesses only two unpaired electrons?</p>
<p class="p1">A. <span class="Apple-converted-space"> </span>Zn</p>
<p class="p1">B. <span class="Apple-converted-space"> </span>Mg</p>
<p class="p1">C. <span class="Apple-converted-space"> </span>\({\text{T}}{{\text{i}}^{2 + }}\)</p>
<p class="p1">D. <span class="Apple-converted-space"> </span>\({\text{F}}{{\text{e}}^{2 + }}\)</p>
</div>
<h2 style="margin-top: 1em">Markscheme</h2>
<div class="question">
<p>C</p>
</div>
<h2 style="margin-top: 1em">Examiners report</h2>
<div class="question">
[N/A]
</div>
<br><hr><br><div class="question">
<p class="p1">Which species has the electron configuration of \({\text{1}}{{\text{s}}^{\text{2}}}{\text{2}}{{\text{s}}^{\text{2}}}{\text{2}}{{\text{p}}^{\text{6}}}{\text{3}}{{\text{s}}^{\text{2}}}{\text{3}}{{\text{p}}^{\text{6}}}{\text{3}}{{\text{d}}^{\text{8}}}\)?</p>
<p class="p1">A. <span class="Apple-converted-space"> </span>Ni</p>
<p class="p1">B. <span class="Apple-converted-space"> </span>\({\text{N}}{{\text{i}}^{2 + }}\)</p>
<p class="p1">C. <span class="Apple-converted-space"> </span>Fe</p>
<p class="p1">D. <span class="Apple-converted-space"> </span>\({\text{C}}{{\text{u}}^{2 + }}\)</p>
</div>
<h2 style="margin-top: 1em">Markscheme</h2>
<div class="question">
<p class="p1">B</p>
</div>
<h2 style="margin-top: 1em">Examiners report</h2>
<div class="question">
[N/A]
</div>
<br><hr><br><div class="question">
<p class="p1">Which representation would be correct for a species, <strong>Z</strong>, which has 31 protons, 40 neutrons and 28 electrons?</p>
<p class="p2"><span class="s1">A. \({}_{31}^{71}{{\rm{Z}}^{3 + }}\)</span></p>
<p class="p2"><span class="s1">B. \({}_{31}^{71}{{\rm{Z}}^{3 - }}\)</span></p>
<p class="p2"><span class="s1">C. \({}_{40}^{71}{{\rm{Z}}^{3 + }}\)</span></p>
<p class="p3"><span class="s1">D. \({}_{28}^{71}{{\rm{Z}}^{3 + }}\)</span></p>
</div>
<h2 style="margin-top: 1em">Markscheme</h2>
<div class="question">
<p>A</p>
</div>
<h2 style="margin-top: 1em">Examiners report</h2>
<div class="question">
[N/A]
</div>
<br><hr><br><div class="question">
<p class="p1">What is the correct electron configuration of the \({\text{C}}{{\text{u}}^ + }\) ion?</p>
<p class="p1">A. <span class="Apple-converted-space"> </span>\({\text{[Ar] 3}}{{\text{d}}^{\text{9}}}{\text{ 4}}{{\text{s}}^{\text{1}}}\)</p>
<p class="p1">B. <span class="Apple-converted-space"> </span>\({\text{[Ar] 3}}{{\text{d}}^{\text{7}}}{\text{ 4}}{{\text{s}}^{\text{2}}}\)</p>
<p class="p1">C. <span class="Apple-converted-space"> </span>\({\text{[Ar] 3}}{{\text{d}}^{{\text{10}}}}\)</p>
<p class="p1">D. <span class="Apple-converted-space"> </span>\({\text{[Ar] 3}}{{\text{d}}^{\text{8}}}{\text{ 4}}{{\text{s}}^{\text{1}}}\)</p>
</div>
<h2 style="margin-top: 1em">Markscheme</h2>
<div class="question">
<p class="p1">C</p>
</div>
<h2 style="margin-top: 1em">Examiners report</h2>
<div class="question">
<p class="p1">One respondent stated that the question should not have been asked, as students are not supposed to know the Cu exception. In the teacher’s notes of assessment statement 12.1.6 in the syllabus details it is clearly stated “exceptions to the principle for copper and chromium should be known”. 56.49% of the candidates chose the correct answer C, with 30.78% choosing A which means that about one-third of the schools do not teach these two exceptions.</p>
</div>
<br><hr><br><div class="question">
<p class="p1">What is the electron configuration of vanadium?</p>
<p class="p1">A. <span class="Apple-converted-space"> </span>\({\text{1}}{{\text{s}}^{\text{2}}}{\text{2}}{{\text{s}}^{\text{2}}}{\text{2}}{{\text{p}}^{\text{6}}}{\text{3}}{{\text{s}}^{\text{2}}}{\text{3}}{{\text{p}}^{\text{6}}}{\text{3}}{{\text{d}}^{\text{2}}}{\text{4}}{{\text{s}}^{\text{3}}}\)</p>
<p class="p1">B. <span class="Apple-converted-space"> </span>\({\text{1}}{{\text{s}}^{\text{2}}}{\text{2}}{{\text{s}}^{\text{2}}}{\text{2}}{{\text{p}}^{\text{6}}}{\text{3}}{{\text{s}}^{\text{2}}}{\text{3}}{{\text{p}}^{\text{6}}}{\text{3}}{{\text{d}}^{\text{3}}}{\text{4}}{{\text{s}}^{\text{2}}}\)</p>
<p class="p1">C. <span class="Apple-converted-space"> </span>\({\text{1}}{{\text{s}}^{\text{2}}}{\text{2}}{{\text{s}}^{\text{2}}}{\text{2}}{{\text{p}}^{\text{6}}}{\text{3}}{{\text{s}}^{\text{2}}}{\text{3}}{{\text{p}}^{\text{6}}}{\text{3}}{{\text{d}}^{\text{4}}}{\text{4}}{{\text{s}}^{\text{1}}}\)</p>
<p class="p1">D. <span class="Apple-converted-space"> </span>\({\text{1}}{{\text{s}}^{\text{2}}}{\text{2}}{{\text{s}}^{\text{2}}}{\text{2}}{{\text{p}}^{\text{6}}}{\text{3}}{{\text{s}}^{\text{2}}}{\text{3}}{{\text{p}}^{\text{6}}}{\text{3}}{{\text{d}}^{\text{5}}}\)</p>
</div>
<h2 style="margin-top: 1em">Markscheme</h2>
<div class="question">
<p>B</p>
</div>
<h2 style="margin-top: 1em">Examiners report</h2>
<div class="question">
<p class="p1">On one of the G2’s it was stated that it would have been better if the 3d level was placed after the 4s level. It is true that in many textbooks that the electron configuration of V is written as \({\text{1}}{{\text{s}}^{\text{2}}}{\text{2}}{{\text{s}}^{\text{2}}}{\text{2}}{{\text{p}}^{\text{6}}}{\text{3}}{{\text{s}}^{\text{2}}}{\text{3}}{{\text{p}}^{\text{6}}}{\text{4}}{{\text{s}}^{\text{2}}}{\text{3}}{{\text{d}}^{\text{3}}}\). However, most candidates (72.19%) gave B as the correct answer.</p>
</div>
<br><hr><br><div class="question">
<p>What are the numbers of neutrons and electrons in the iodine ion, \(^{{\text{125}}}{{\text{I}}^ + }\)?</p>
<p><img src="images/Schermafbeelding_2016-08-24_om_12.16.06.png" alt="N13/4/CHEMI/HPM/ENG/TZ0/04"></p>
</div>
<h2 style="margin-top: 1em">Markscheme</h2>
<div class="question">
<p>B</p>
</div>
<h2 style="margin-top: 1em">Examiners report</h2>
<div class="question">
[N/A]
</div>
<br><hr><br><div class="question">
<p>What is the abbreviated electron configuration of the telluride ion, \({\text{T}}{{\text{e}}^{2 - }}\)?</p>
<p>A. \({\text{[Kr]5}}{{\text{s}}^{\text{2}}}{\text{5}}{{\text{d}}^{{\text{10}}}}{\text{5}}{{\text{p}}^{\text{6}}}\)</p>
<p>B. \({\text{[Kr]5}}{{\text{s}}^{\text{2}}}{\text{4}}{{\text{d}}^{{\text{10}}}}{\text{5}}{{\text{p}}^{\text{2}}}\)</p>
<p>C. \({\text{[Kr]5}}{{\text{s}}^{\text{2}}}{\text{4}}{{\text{d}}^{{\text{10}}}}{\text{5}}{{\text{p}}^{\text{4}}}\)</p>
<p>D. \({\text{[Kr]5}}{{\text{s}}^{\text{2}}}{\text{4}}{{\text{d}}^{{\text{10}}}}{\text{5}}{{\text{p}}^{\text{6}}}\)</p>
</div>
<h2 style="margin-top: 1em">Markscheme</h2>
<div class="question">
<p>D</p>
</div>
<h2 style="margin-top: 1em">Examiners report</h2>
<div class="question">
[N/A]
</div>
<br><hr><br><div class="question">
<p class="p1">Consider the relative abundance of the isotopes of element X.</p>
<p class="p1" style="text-align: center;"><img src="images/Schermafbeelding_2016-10-26_om_13.57.59.png" alt="M11/4/CHEMI/HPM/ENG/TZ2/04"></p>
<p class="p1">What is the relative atomic mass of X?</p>
<p class="p1">A. 24</p>
<p class="p1">B. 25</p>
<p class="p1">C. Between 24 and 25</p>
<p class="p1">D. Between 25 and 26</p>
</div>
<h2 style="margin-top: 1em">Markscheme</h2>
<div class="question">
<p>C</p>
</div>
<h2 style="margin-top: 1em">Examiners report</h2>
<div class="question">
[N/A]
</div>
<br><hr><br><div class="question">
<p class="p1">In the electromagnetic spectrum, which will have the shortest wavelength <strong>and </strong>the greatest energy?</p>
<p class="p1"><img src="images/Schermafbeelding_2016-11-01_om_05.26.57.png" alt="M12/4/CHEMI/HPM/ENG/TZ2/05"></p>
</div>
<h2 style="margin-top: 1em">Markscheme</h2>
<div class="question">
<p>A</p>
</div>
<h2 style="margin-top: 1em">Examiners report</h2>
<div class="question">
[N/A]
</div>
<br><hr><br><div class="question">
<p class="p1">Which shows the sub-levels in order of <strong>increasing </strong>energy in the fourth energy level of an atom?</p>
<p class="p1">A. <span class="Apple-converted-space"> </span>\({\text{f}} < {\text{d}} < {\text{p}} < {\text{s}}\)</p>
<p class="p1">B. <span class="Apple-converted-space"> </span>\({\text{p}} < {\text{d}} < {\text{f}} < {\text{s}}\)</p>
<p class="p1">C. <span class="Apple-converted-space"> </span>\({\text{d}} < {\text{f}} < {\text{p}} < {\text{s}}\)</p>
<p class="p1">D. <span class="Apple-converted-space"> </span>\({\text{s}} < {\text{p}} < {\text{d}} < {\text{f}}\)</p>
</div>
<h2 style="margin-top: 1em">Markscheme</h2>
<div class="question">
<p>D</p>
</div>
<h2 style="margin-top: 1em">Examiners report</h2>
<div class="question">
[N/A]
</div>
<br><hr><br><div class="question">
<p class="p1">What is the electron configuration of the \({\text{C}}{{\text{r}}^{2 + }}\) ion?</p>
<p class="p1">A. <span class="Apple-converted-space"> </span>\({\text{[Ar]3}}{{\text{d}}^{\text{5}}}{\text{4}}{{\text{s}}^{\text{1}}}\)</p>
<p class="p1">B. <span class="Apple-converted-space"> </span>\({\text{[Ar]3}}{{\text{d}}^{\text{3}}}{\text{4}}{{\text{s}}^{\text{1}}}\)</p>
<p class="p1">C. <span class="Apple-converted-space"> </span>\({\text{[Ar]3}}{{\text{d}}^{\text{6}}}{\text{4}}{{\text{s}}^{\text{1}}}\)</p>
<p class="p1">D. <span class="Apple-converted-space"> </span>\({\text{[Ar]3}}{{\text{d}}^{\text{4}}}{\text{4}}{{\text{s}}^{\text{0}}}\)</p>
</div>
<h2 style="margin-top: 1em">Markscheme</h2>
<div class="question">
<p>D</p>
</div>
<h2 style="margin-top: 1em">Examiners report</h2>
<div class="question">
[N/A]
</div>
<br><hr><br><div class="question">
<p>Which statement correctly describes the atomic emission spectrum of hydrogen?</p>
<p>A. It is a continuous spectrum converging at high frequency.</p>
<p>B. It is a line spectrum converging at high frequency.</p>
<p>C. It is a continuous spectrum converging at low frequency.</p>
<p>D. It is a line spectrum converging at low frequency.</p>
</div>
<h2 style="margin-top: 1em">Markscheme</h2>
<div class="question">
<p>B</p>
</div>
<h2 style="margin-top: 1em">Examiners report</h2>
<div class="question">
[N/A]
</div>
<br><hr><br><div class="question">
<p>Which electron configurations do not follow the Hund's rule?</p>
<p><img src="images/Schermafbeelding_2016-08-11_om_06.29.48.png" alt="M14/4/CHEMI/HPM/ENG/TZ1/05"></p>
<p>A. I and II only</p>
<p>B. I and III only</p>
<p>C. II and III only</p>
<p>D. I, II and III</p>
</div>
<h2 style="margin-top: 1em">Markscheme</h2>
<div class="question">
<p>C</p>
</div>
<h2 style="margin-top: 1em">Examiners report</h2>
<div class="question">
<p>Many G2s and OCC forum comments were made by teachers as reference had been made to the Aufbau principle instead of just Hund´s rule. This was however no problem for the students as 88% recognised that options II and III are incorrect electron configurations.</p>
</div>
<br><hr><br>