Mohammed is twice as old as eze.if eze is n years old,how old is mohammed

<h2>Writing Chemical Formulae</h2>
<p>A <strong>chemical formula</strong> is a concise way of giving information about the <a data-lesson="chemical-formulas" data-subject="chemistry" data-tutorial="atoms-molecules-ions" href="https://app.ulearngo.com/chemistry/atoms-molecules-ions/chemical-formulas">atoms</a> that make up a particular chemical compound. A chemical formula shows each <a data-lesson="elements" data-subject="chemistry" data-tutorial="classification-of-matter" href="https://app.ulearngo.com/chemistry/classification-of-matter/elements">element</a> by its symbol and also shows how many atoms of each element are found in that compound. The <a data-lesson="atomic-and-atomic-mass-number" data-subject="chemistry" data-tutorial="chemistry-essential-ideas" href="https://app.ulearngo.com/chemistry/chemistry-essential-ideas/atomic-and-atomic-mass-number">number</a> of atoms (if greater than one) is shown as a subscript.</p>
<section>
<h2>Revision of Chemical Formulae</h2>
<p>The following exercise serves as revision. If you do not recall how to write chemical <a data-lesson="writing-formulae" data-subject="chemistry" data-tutorial="bonding-atomic-combinations" href="https://app.ulearngo.com/chemistry/bonding-atomic-combinations/writing-formulae">formulae</a> refer back to <a href="https://app.ulearngo.com/tutorial/chemistry-102/">Chemistry 102</a>.</p>
<h3>Exercises:</h3>
<div>
<div>
<p><strong>Write down the chemical formula for each of the following compounds:</strong></p>
<ol>
<li>
<p>iron (III) chloride</p>
</li>
<li>
<p>zinc nitrate</p>
</li>
<li>
<p>aluminium sulfate</p>
</li>
<li>
<p>calcium hydroxide</p>
</li>
<li>
<p>magnesium carbonate</p>
</li>
<li>
<p>the product when <a data-lesson="carbon" data-subject="chemistry" data-tutorial="metals-metalloids-nonmetals" href="https://app.ulearngo.com/chemistry/metals-metalloids-nonmetals/carbon">carbon</a> reacts with oxygen</p>
</li>
<li>
<p>the product when <a data-lesson="hydrogen-reactions" data-subject="chemistry" data-tutorial="metals-metalloids-nonmetals" href="https://app.ulearngo.com/chemistry/metals-metalloids-nonmetals/hydrogen-reactions">hydrogen</a> reacts with nitrogen</p>
</li>
<li>
<p>potassium oxide</p>
</li>
<li>
<p>copper (II) bromide</p>
</li>
<li>
<p>potassium dichromate</p>
</li>
</ol>
</div>
</div>
<div>
<div>
<p><strong>Write down the name for each of the following compounds:</strong></p>
<ol>
<li>
<p>\(\text{SO}_{2}\)</p>
</li>
<li>
<p>\(\text{KMnO}_{4}\)</p>
</li>
<li>
<p>\((\text{NH}_{4})_{2}\text{SO}_{4}\)</p>
</li>
<li>
<p>\(\text{BaF}_{2}\)</p>
</li>
<li>
<p>\(\text{Cr}(\text{HSO}_{4})_{3}\)</p>
</li>
<li>
<p>\(\text{CH}_{4}\)</p>
</li>
</ol>
</div>
</div>
</section>

1da7dde6-444c-4cfc-9055-98f781c809ca

Writing Chemical Formulae

Chemistry generally explores the substances of which matter is composed, the investigation of their properties and reactions, and the use of such reactions to form new substances. 

Chemistry

Discover the different types of changes that matter can undergo and learn about the laws and principles that govern those changes, including the conservation of mass and volume relationships in gases, as well as the correct way of representing and balancing chemical equations.


Writing Chemical Formulae

Track Your Learning Progress

Earlier discussion