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</div><h2>SL Paper 1</h2><div class="question">
<p class="p1">Which descriptions are correct for both a Brønsted–Lowry acid and a Lewis acid?</p>
<p class="p1"><img src="images/Schermafbeelding_2016-11-03_om_14.02.37.png" alt="N11/4/CHEMI/SPM/ENG/TZ0/21"></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 definition of a base is correct?</p>
<p>A. A Lewis base accepts a proton.</p>
<p>B. A Brønsted-Lowry base accepts an electron pair.</p>
<p>C. A Brønsted-Lowry base donates an electron pair.</p>
<p>D. A Lewis base donates an electron pair.</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">Which substance can act as a Lewis acid but not as a Brønsted–Lowry acid?</p>
<p class="p1">A. <span class="Apple-converted-space"> </span>HCl</p>
<p class="p1">B. <span class="Apple-converted-space"> </span>CH<sub><span class="s1">3</span></sub>COOH</p>
<p class="p1">C. <span class="Apple-converted-space"> </span>BF<sub><span class="s1">3</span></sub></p>
<p class="p1">D. <span class="Apple-converted-space"> </span>CF<sub><span class="s1">3</span></sub>COOH</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 are definitions of an acid according to the Brønsted-Lowry and Lewis theories?</p>
<p class="p1"><img src="images/Schermafbeelding_2016-10-19_om_07.29.42.png" alt="M09/4/CHEMI/SPM/ENG/TZ2/21"></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>Which species <strong>cannot </strong>function as a Lewis acid?</p>
<p>A. \({\text{B}}{{\text{F}}_{\text{3}}}\)</p>
<p>B. \({\text{AlC}}{{\text{l}}_{\text{3}}}\)</p>
<p>C. \({\text{CC}}{{\text{l}}_{\text{4}}}\)</p>
<p>D. \({{\text{H}}^ + }\)</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>Whilst 42% correctly identified \({\text{CC}}{{\text{l}}_{\text{4}}}\) the most popular wrong answer (38%) was the \({{\text{H}}^ + }\) ion.</p>
</div>
<br><hr><br><div class="question">
<p>Which statement explains why ammonia, \({\text{N}}{{\text{H}}_{\text{3}}}\), is classified as a Lewis base?</p>
<p>A. It can accept a proton.</p>
<p>B. It can accept a lone pair of electrons.</p>
<p>C. It can donate a lone pair of electrons.</p>
<p>D. It can donate a proton.</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>