File "markSceme-HL-paper1.html"
Path: /IB QUESTIONBANKS/4 Fourth Edition - PAPER/HTML/Chemistry/Topic 1/markSceme-HL-paper1html
File size: 15.59 KB
MIME-type: text/html
Charset: utf-8
<!DOCTYPE html>
<html>
<meta http-equiv="content-type" content="text/html;charset=utf-8">
<head>
<meta charset="utf-8">
<title>IB Questionbank</title>
<link rel="stylesheet" media="all" href="css/application-746ec5d03ead8d9e8b3bb7d32173f2b4e2e22a05f0c5278e086ab55b3c9c238e.css">
<link rel="stylesheet" media="print" href="css/print-6da094505524acaa25ea39a4dd5d6130a436fc43336c0bb89199951b860e98e9.css">
<script src="js/application-3c91afd8a2942c18d21ed2700e1bdec14ada97f1d3788ae229315e1276d81453.js"></script>
<script type="text/javascript" async src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.5/MathJax.js?config=TeX-MML-AM_CHTML-full"></script>
<!--[if lt IE 9]>
<script src='https://cdnjs.cloudflare.com/ajax/libs/html5shiv/3.7.3/html5shiv.min.js'></script>
<![endif]-->
<meta name="csrf-param" content="authenticity_token">
<meta name="csrf-token" content="iHF+M3VlRFlNEehLVICYgYgqiF8jIFlzjGNjIwqOK9cFH3ZNdavBJrv/YQpz8vcspoICfQcFHW8kSsHnJsBwfg==">
<link href="favicon.ico" rel="shortcut icon">
</head>
<body class="teacher questions-show">
<div class="navbar navbar-fixed-top">
<div class="navbar-inner">
<div class="container">
<div class="brand">
<div class="inner"><a href="http://ibo.org/">ibo.org</a></div>
</div>
<ul class="nav">
<li>
<a href="../../index.html">Home</a>
</li>
<li class="active dropdown">
<a class="dropdown-toggle" data-toggle="dropdown" href="#">
Questionbanks
<b class="caret"></b>
</a><ul class="dropdown-menu">
<li>
<a href="../../geography.html" target="_blank">DP Geography</a>
</li>
<li>
<a href="../../physics.html" target="_blank">DP Physics</a>
</li>
<li>
<a href="../../chemistry.html" target="_blank">DP Chemistry</a>
</li>
<li>
<a href="../../biology.html" target="_blank">DP Biology</a>
</li>
<li>
<a href="../../furtherMath.html" target="_blank">DP Further Mathematics HL</a>
</li>
<li>
<a href="../../mathHL.html" target="_blank">DP Mathematics HL</a>
</li>
<li>
<a href="../../mathSL.html" target="_blank">DP Mathematics SL</a>
</li>
<li>
<a href="../../mathStudies.html" target="_blank">DP Mathematical Studies</a>
</li>
</ul></li>
<!-- - if current_user.is_language_services? && !current_user.is_publishing? -->
<!-- %li= link_to "Language services", tolk_path -->
</ul>
<ul class="nav pull-right">
<li>
<a href="https://06082010.xyz">IB Documents (2) Team</a>
</li></ul>
</div>
</div>
</div>
<div class="page-content container">
<div class="row">
<div class="span24">
</div>
</div>
<div class="page-header">
<div class="row">
<div class="span16">
<p class="back-to-list">
</p>
</div>
<div class="span8" style="margin: 0 0 -19px 0;">
<img style="width: 100%;" class="qb_logo" src="images/logo.jpg" alt="Ib qb 46 logo">
</div>
</div>
</div><h2>HL Paper 1</h2><div class="question">
<p>At which temperature, in K, assuming constant pressure, is the volume of a fixed mass of gas at 127 °C doubled?</p>
<p>A. 200 K</p>
<p>B. 254 K</p>
<p>C. 400 K</p>
<p>D. 800 K</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">\({\text{300 c}}{{\text{m}}^{\text{3}}}\) of water is added to a solution of \({\text{200 c}}{{\text{m}}^{\text{3}}}\) of \({\text{0.5 mol}}\,{\text{d}}{{\text{m}}^{ - 3}}\) sodium chloride. What is the concentration of sodium chloride in the new solution?</p>
<p class="p1">A. <span class="Apple-converted-space"> </span>\({\text{0.05 mol}}\,{\text{d}}{{\text{m}}^{ - 3}}\)</p>
<p class="p1">B. <span class="Apple-converted-space"> </span>\({\text{0.1 mol}}\,{\text{d}}{{\text{m}}^{ - 3}}\)</p>
<p class="p1">C. <span class="Apple-converted-space"> </span>\({\text{0.2 mol}}\,{\text{d}}{{\text{m}}^{ - 3}}\)</p>
<p class="p1">D. <span class="Apple-converted-space"> </span>\({\text{0.3 mol}}\,{\text{d}}{{\text{m}}^{ - 3}}\)</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 class="p1">One respondent stated that it would be best to start HLP1 with a mole type question and that these first three questions could have potentially tripped up candidates at the beginning of this paper. It must be emphasised that P1 covers all topics on the syllabus and, hence, any question can be asked as an Objective 1 or 2 multiple-choice type question based on any of the corresponding AS‟s on Topic 1 - Quantitative Chemistry. As regards the questions themselves, none of these three questions, in fact, posed a significant problem for candidates. 76% of candidates got Q1 correct, 68% Q2 and 78% Q3.</p>
</div>
<br><hr><br><div class="question">
<p class="p1">Four identical containers under the same conditions are filled with gases as shown below. Which container and contents will have the highest mass?</p>
<p class="p1"><img src="images/Schermafbeelding_2016-11-02_om_12.02.21.png" alt="N11/4/CHEMI/HPM/ENG/TZ0/03"></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 pressure, in Pa, inside a 1.0 m<sup>3</sup> cylinder containing 10 kg of H<sub>2</sub> (g) at 25 ºC?</p>
<p><em>R</em> = 8.31 J K<sup>–1</sup> mol<sup>–1</sup>; <em>pV</em> = <em>nRT</em></p>
<p>A. \(\frac{{1 \times {{10}^4} \times 8.31 \times 25}}{{1.0 \times {{10}^3}}}\)</p>
<p>B. \(\frac{{5 \times {{10}^2} \times 8.31 \times 298}}{{1.0}}\)</p>
<p>C. \(\frac{{1 \times 8.31 \times 25}}{{1.0 \times {{10}^3}}}\)</p>
<p>D. \(\frac{{5 \times {{10}^3} \times 8.31 \times 298}}{{1.0}}\)</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>A compound with <em>M</em><sub>r</sub> = 102 contains 58.8 % carbon, 9.80 % hydrogen and 31 % oxygen by mass.<br>What is its molecular formula?</p>
<p><em>A</em><sub>r</sub>: C = 12.0; H = 1.0; O = 16.0</p>
<p>A. C<sub>2</sub>H<sub>14</sub>O<sub>4</sub></p>
<p>B. C<sub>3</sub>H<sub>4</sub>O<sub>4</sub></p>
<p>C. C<sub>5</sub>H<sub>10</sub>O<sub>2</sub></p>
<p>D. C<sub>6</sub>H<sub>14</sub>O</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>Which solution neutralizes 50.0 cm<sup>3</sup> of 0.120 mol dm<sup>–3</sup> NaOH (aq)?</p>
<p>A. 12.5 cm<sup>3</sup> of 0.080 mol dm<sup>–3</sup> H<sub>3</sub>PO<sub>4</sub></p>
<p>B. 25.0 cm<sup>3</sup> of 0.120 mol dm<sup>–3</sup> CH<sub>3</sub>COOH</p>
<p>C. 25.0 cm<sup>3</sup> of 0.120 mol dm<sup>–3</sup> H<sub>2</sub>SO<sub>4</sub></p>
<p>D. 50.0 cm<sup>3</sup> of 0.060 mol dm<sup>–3</sup> HNO<sub>3</sub></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">What mass, in g, of hydrogen is formed when 3 mol of aluminium react with excess hydrochloric acid according to the following equation?</p>
<p class="p1">\[{\text{2Al(s)}} + {\text{6HCl(aq)}} \to {\text{2AlC}}{{\text{l}}_{\text{3}}}{\text{(aq)}} + {\text{3}}{{\text{H}}_{\text{2}}}{\text{(g)}}\]</p>
<p class="p1">A. <span class="Apple-converted-space"> </span>3.0</p>
<p class="p1">B. <span class="Apple-converted-space"> </span>4.5</p>
<p class="p1">C. <span class="Apple-converted-space"> </span>6.0</p>
<p class="p1">D. <span class="Apple-converted-space"> </span>9.0</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 class="p1">Which coefficients would balance this equation?</p>
<p class="p1" style="text-align: center;"><em>__ </em>\({\text{Mn}}{{\text{O}}_2} + \) <em>__ </em>\({\text{HCl}} \to \) <em>__ </em>\({\text{MnC}}{{\text{l}}_2} + \) <em>__ </em>\({\text{C}}{{\text{l}}_2} + \) <em>__ </em>\({{\text{H}}_2}{\text{O}}\)</p>
<p class="p1"><img src="images/Schermafbeelding_2016-09-30_om_12.28.01.png" alt="N09/4/CHEMI/HPM/ENG/TZ0/01"></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 class="p1">In spite of a concern on the part of one teacher that this question was too difficult, this was one of the questions that students found easiest, with a Difficulty Index of 94%; hence it provided a nice easy start to settle students into the paper.</p>
</div>
<br><hr><br><div class="question">
<p>4.0 g of solid sodium hydroxide is added to \({\text{0.10 d}}{{\text{m}}^{\text{3}}}\) of \({\text{1.0 mol d}}{{\text{m}}^{ - 3}}\) aqueous sulfuric acid.<br>\[{\text{2NaOH(s) + }}{{\text{H}}_{\text{2}}}{\text{S}}{{\text{O}}_{\text{4}}}{\text{(aq) }} \to {\text{ N}}{{\text{a}}_{\text{2}}}{\text{S}}{{\text{O}}_{\text{4}}}{\text{(aq) + 2}}{{\text{H}}_{\text{2}}}{\text{O(l)}}\]<br>Which statement is correct?</p>
<p class="p1">A. <span class="Apple-converted-space"> </span>Neither reactant is in excess.</p>
<p class="p1">B. <span class="Apple-converted-space"> </span>0.10 mol \({\text{N}}{{\text{a}}_{\text{2}}}{\text{S}}{{\text{O}}_{\text{4}}}\) is formed.</p>
<p class="p1">C. <span class="Apple-converted-space"> </span>Excess \({{\text{H}}_{\text{2}}}{\text{S}}{{\text{O}}_{\text{4}}}\) remains in solution.</p>
<p class="p1">D. <span class="Apple-converted-space"> </span>Excess NaOH remains in solution.</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">
[N/A]
</div>
<br><hr><br><div class="question">
<p>What are the coefficients of \({{\text{H}}_{\text{2}}}{\text{S}}{{\text{O}}_{\text{4}}}{\text{(aq)}}\) and \({{\text{H}}_{\text{3}}}{\text{P}}{{\text{O}}_{\text{4}}}{\text{(aq)}}\) when the following equation is balanced using the smallest possible whole numbers?</p>
<p style="text-align: center;">___ \({\text{C}}{{\text{a}}_3}{{\text{(P}}{{\text{O}}_4}{\text{)}}_2}{\text{(s)}} + \) ___ \({{\text{H}}_2}{\text{S}}{{\text{O}}_4}{\text{(aq)}} \to \) ___ \({\text{CaS}}{{\text{O}}_3}{\text{(s)}} + \) ___ \({{\text{H}}_3}{\text{P}}{{\text{O}}_4}{\text{(aq)}}\)</p>
<p style="text-align: left;"><img src="images/Schermafbeelding_2016-08-24_om_12.06.21.png" alt="N13/4/CHEMI/HPM/ENG/TZ0/02"></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 volume of carbon dioxide, in dm<span class="s1">\(^3\) </span>under standard conditions, is formed when 7.00 g of ethene \(({{\text{C}}_2}{{\text{H}}_4}{\text{, }}{M_{\text{r}}} = 28.1)\) undergoes complete combustion?</p>
<p class="p1">A. <span class="Apple-converted-space"> </span>\(\frac{{22{\text{.}}4 \times 28{\text{.}}1}}{{7{\text{.}}00}}\)</p>
<p class="p1">B. <span class="Apple-converted-space"> </span>\(\frac{{22{\text{.}}4 \times 7{\text{.}}00}}{{28{\text{.}}1}}\)</p>
<p class="p1">C. <span class="Apple-converted-space"> </span>\(\frac{{2 \times 22{\text{.}}4 \times 28{\text{.}}1}}{{7{\text{.}}00}}\)</p>
<p class="p1">D. <span class="Apple-converted-space"> </span>\(\frac{{2 \times 22{\text{.}}4 \times 7{\text{.}}00}}{{28{\text{.}}1}}\)</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>Under which conditions does \({\text{C}}{{\text{H}}_{\text{4}}}\) have the same number of molecules as \({\text{100 c}}{{\text{m}}^{\text{3}}}\) of \({{\text{O}}_{\text{2}}}\) at 27 °C and \(1.0 \times {10^5}{\text{ Pa}}\)?</p>
<p><img src="images/Schermafbeelding_2016-08-11_om_06.26.20.png" alt="M14/4/CHEMI/HPM/ENG/TZ1/02"></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">
<p>Some teachers were worried about the use of a skeletal formula for the benzene ring. Certainly skeletal formulas are not on the syllabus but the benzene ring is.</p>
</div>
<br><hr><br><div class="question">
<p>7.102 g of <strong>Na<sub>2</sub>SO<sub>4</sub> (<em>M</em> = 142.04 g mol<sup>–1</sup>)</strong> is dissolved in water to prepare \({\text{0.5000 d}}{{\text{m}}^{\text{3}}}\) of solution. What is the concentration of \({\text{N}}{{\text{a}}_{\text{2}}}{\text{S}}{{\text{O}}_{\text{4}}}\) in \({\text{mol}}\,{\text{d}}{{\text{m}}^{ - 3}}\)?</p>
<p>A. \(2.500 \times {10^{ - 2}}\)</p>
<p>B. \(1.000 \times {10^{ - 1}}\)</p>
<p>C. \(1.000 \times 10\)</p>
<p>D. \({\text{1.000}} \times {\text{1}}{{\text{0}}^{\text{2}}}\)</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 expression gives the sum of all the coefficients for the general equation for the complete</p>
<p class="p1">combustion of hydrocarbons?</p>
<p class="p1" style="text-align: center;">___ \({{\text{C}}_x}{{\text{H}}_y}{\text{(g)}} + \) ___ \({{\text{O}}_{\text{2}}}{\text{(g)}} \to \) ___ \({\text{C}}{{\text{O}}_{\text{2}}}{\text{(g)}} + \) ___ \({{\text{H}}_{\text{2}}}{\text{O(l)}}\)</p>
<p class="p1">A. <span class="Apple-converted-space"> </span>\(1 + x + \frac{y}{4}\)</p>
<p class="p1">B. <span class="Apple-converted-space"> </span>\(1 + x + \frac{y}{2}\)</p>
<p class="p1">C. <span class="Apple-converted-space"> </span>\(1 + 2x + \frac{{3y}}{4}\)</p>
<p class="p1">D. <span class="Apple-converted-space"> </span>\(1 + 2x + \frac{{3y}}{2}\)</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>Although this might have seemed unfamiliar, nearly 50% gave the correct answer. Many thought this was too challenging for an early question. The examination questions are, and have been for many years, presented in topic order. Those candidates who find the more mathematical manipulation testing should, perhaps, be advised the tackle the questions in a different order.</p>
<p class="p1"> </p>
</div>
<br><hr><br><div class="question">
<p class="p1">Which graph represents the relationship between volume and pressure for a fixed mass of gas at constant temperature?</p>
<p><img src="images/Schermafbeelding_2016-09-12_om_12.06.18.png" alt="M13/4/CHEMI/HPM/ENG/TZ1/03"></p>
</div>
<h2 style="margin-top: 1em">Markscheme</h2>
<div class="question">
<p class="p1">D</p>
</div>
<h2 style="margin-top: 1em">Examiners report</h2>
<div class="question">
[N/A]
</div>
<br><hr><br>