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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Exercises in balancing chemistry equations</title>
<script src="chem1.js" defer></script>
<script src="timer.js" defer></script>
<meta name="keywords" content="exercises, balancing, chemistry, equations, hydrogen, oxygen, carbon-monoxide, carbon-dioxide, sodium-hydroxide, sulphuric-acid, preparation">
<meta name="author" content="Jiban Majumdar">
<link rel="stylesheet" href="mystyle.css">
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<body>
<div>
<img src="myPhoto.jpg" alt="webmaster" width="150" height="200"> <br> <a href="mailto:jibanmajumdar@gmail.com">webmaster</a>
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<h1 style="text-align:center;">Exercises in Balancing Chemistry Equations</h1>
<p style="font-size:115%; text-align:left;">Writing and balancing chemistry equations generally pose a problem to a secondary school student. Although various techniques are mentioned in the literature, apparently there seems to be no magic formula for learning equations. They need to be practised repeatedly.</p>
<p style="font-size:115%; text-align:left;">An attempt has been made to give exercises in balancing chemistry equations in the following topics:</p>
<p style="font-size:115%; color:blue;">A <i>sample equation</i> is given below:</p>
<h3>Direction:</h3>
<ul>
<li>In the following equation you will see a blank box before the symbol of each compound and element. Enter the lowest possible number in each box, or leave the box blank if you think the chemical needn't have a number (i.e. the number is equivalent to '1').</li>
<li>When you think the equation is balanced, click on the small button <span style="color:blue;"><b>"Check answer"</b></span> that appears below it.</li>
<li>If your equation is incorrect, then click the button <span style="color:blue;"><b>"Reset"</b></span> and try balancing the equation again.</li>
<li>In case you are in a hurry or are unable to balance, then click the button <span style="color:blue;"><b>"Show answer."</b></span></li>
<li>If you want to know the time taken (minutes:seconds) to balance a chemical equation, you click the <span style="color:blue;"><b>"Start"</b></span> button and after balancing the equation, click the <span style="color:blue;"><b>"Stop"</b></span>button. Once, you have noted the time, click the <span style="color:blue;"><b>"Reset Timer"</b></span> button.
</li>
</ul>
<form name="equations">
<h2>Reactions of Hydrogen:</h2>
A mixture of Hydrogen and Oxygen, when ignited, burns with a 'pop' sound to form water:</li>
<p style="font-size:115%; text-align:center;">
<input style="font-size: 16px; text-align: center" size="1" name="q1a"> H<sub>2</sub> +
<input style="font-size: 16px; text-align: center" size="1" name="q1b"> O<sub>2</sub> →
<input style="font-size: 16px; text-align: center" size="1" name="q1c"> H<sub>2</sub>O
</p>
<p style="font-size:115%; text-align:center;">
<input onclick="check(1, 'Reactions of Hydrogen', 2, 1, 2, 0, 0, 0, 'H<sub>2</sub> + O<sub>2</sub>', 'H<sub>2</sub>O');" type="button" value="Check answer">
<input type="reset" value="Reset">
<input onclick="show(1, 'Reactions of Hydrogen', 2, 1, 2, 0, 0, 0, '2 H<sub>2</sub> + O<sub>2</sub>', '2 H<sub>2</sub>O');" type="button" value="Show answer">
</p>
<p style="font-size:115%; text-align:center;">
<span style="color:blue;"><b>Time Taken:</b></span><span class="timer" id="timer1">00:00</span>
<button type="button" onclick="startTimer('timer1')">Start</button>
<button type="button" onclick="stopTimer('timer1')">Stop</button>
<button type="button" onclick="resetTimer('timer1')">Reset Timer</button>
</p>
</form>
<h3>Note:</h3>
<p>If you get no response after clicking 'Check answer' or 'Show answer', your browser has disabled running this program. Enable it by clicking below the 'address bar' and follow the instructions.</p>
<p style="font-size:115%; color:blue;">Click a topic below to open a separate window.</p>
<ul>
<li><a href="oxygen.html">Oxygen</a></li>
<li><a href="hydrogen.html">Hydrogen</a></li>
<li><a href="carbon-monoxide.html">Carbon Monoxide</a></li>
<li><a href="carbon-dioxide.html">Carbon Dioxide</a></li>
<li><a href="nitrogen.html">Nitrogen</a></li>
</ul>
<a href="index.html">Home Page</a>
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For feedback, please e-mail to: <a href="mailto:jibanmajumdar@gmail.com">jibanmajumdar@gmail.com</a>
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