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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="chem2.js"></script>
<script src="timer.js" defer></script>
<meta name="keywords" content="exercises, balancing, chemistry, equations, fluorine, ozone, potassium-dichromate, potassium permanganate, 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 advanced 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>Preparation of Silver nitrate:</h2>
<ul>
<li>It is prepared by dissolving metallic silver in dilute nitric acid in a porcelain container:</li>
<p style="font-size:125%; text-align:center;">
<input style="font-size: 18px; text-align: center" size="2" name="q1a">Ag +
<input style="font-size: 18px; text-align: center" size="2" name="q1b">HNO<sub>3</sub> →
<input style="font-size: 18px; text-align: center" size="2" name="q1c">NO +
<input style="font-size: 18px; text-align: center" size="2" name="q1d">H<sub>2</sub>O +
<input style="font-size: 18px; text-align: center" size="2" name="q1e">AgNO<sub>3</sub>
</p>
<p style="font-size:125%; text-align:center;">
<input onclick="check(1,'Preparation of Silver nitrate',3,4,1,2,3,0,0,'Ag + HNO<sub>3</sub>', 'NO + H<sub>2</sub>O + AgNO<sub>3</sub>');" type="button" value="Check answer">
<input type="reset" value="Reset">
<input onclick="show(1,'Preparation of Silver nitrate',3,4,1,2,3,0,0,'3 Ag + 4 HNO<sub>3</sub>', 'NO + 2 H<sub>2</sub>O + 3 AgNO<sub>3</sub>');" 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>
</ul>
</form>
<h3>Note:</h3>
<p>If you get no response after clicking 'Check answer' or 'Show answer', your browser has disabled to run 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="fluorine.html">Fluorine</a></li>
<li><a href="ozone.html">Ozone</a></li>
<li><a href="potassium-permanganate.html">Potassium Permanganate</a></li>
<li><a href="potassium-dichromate.html">Potassium Dichromate</a></li>
<li><a href="hydrogen-peroxide.html">Hydrogen Peroxide</a></li>
</ul>
<p><a href="index.html">Home Page</a></p>
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For feedback, please e-mail to: <a href="mailto:jibanmajumdar@gmail.com">jibanmajumdar@gmail.com</a>
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