Reactions as equationshttps://peda.net/id/cffd9e22ea52019-10-09T09:41:24+03:00https://peda.net/:static/533/peda.net.logo.bg.svg<div class="license">Tämän sivun lisenssi <a rel="license" href="https://peda.net/info">Peda.net-yleislisenssi</a></div>
Practise first!https://peda.net/id/96d36b48ea62019-10-09T10:29:54+03:00<!--filtered tag: <article--><!--filtered attribute: id="uuid-d662cd58-ea66-11e9-9545-62f3624c9a50"--><!--filtered attribute: class="link document uuid-d662cd58-ea66-11e9-9545-62f3624c9a50 enclose"--><!--filtered attribute: data-id="d662cd58-ea66-11e9-9545-62f3624c9a50"--><!--filtered attribute: data-draft-type="published"--><!-->--><!--filtered tag: <header--><!-->--><h1><!--filtered attribute: class="link"--><a href="https://phet.colorado.edu/sims/html/balancing-chemical-equations/latest/balancing-chemical-equations_en.html" title="https://phet.colorado.edu/sims/html/balancing-chemical-equations/latest/balancing-chemical-equations_en.html (avautuu uuteen ikkunaan)" target="_blank" rel="nofollow ugc noopener">Simulation</a></h1>
<!--filtered end tag: </header>--><div class="main"><div class="description">With this visual interface, you get to practise balancing reaction equations. Your goal is to increase the amounts of the molecules both before the reaction (left) and after the reaction (right). The Introduction gives you the correct answer straight away, and in the Game, you need to figure out the coefficients yourself.</div>
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2019-10-09T10:29:54+03:00Sulphuric acid tea time!https://peda.net/id/663cfd2eea62019-10-09T10:29:11+03:00Sugar is the compound everyone knows for its sweetness. On the molecular level, however, it goes by the formula [[$ \text{C}_6\text{H}_{12}\text{O}_6 $]]. In other words, a sugar molecule consists of 6 carbon atoms, 12 hydrogen atoms, and 6 oxygen atoms bound together with covalent bonds<a href="https://peda.net/p/janne.rytkonen/bilingual-chemistry/reactions/fmc/fcbimc2#top" class="uuid-e2e5e8ba-194a-11e8-9f27-86f3624c9a50">From covalent bonds into molecular compounds</a>. You can see the 3D structure model of a sugar molecule with your own eyes <a href="https://www.wolframalpha.com/input/?i=fructose" rel="nofollow ugc noopener">here</a>.<br/>
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Sulphuric acid, on the other hand, is a strong dehydrating agent, so it has the capability to cleave water molecules off of other particles. When added on top of sugar, the colour of the yellowish acid turns slowly into a coke-like brown, and slowly but surely towards black. Once the reaction truly starts, a steaming black structure grows out of the container.<br/>
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The question is: what does the tower and the gas consist of?<br/>
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<iframe width="560" height="315" src="https://www.youtube.com/embed/xK4z_YhtTBM" allowfullscreen="allowfullscreen"></iframe><br/>
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If you look closely, the composition of [[$ \text{C}_6\text{H}_{12}\text{O}_6 $]] has a part that ressembles water, namely [[$ \text{H}_{12}\text{O}_6 $]], which has all the atoms to make up 6 water molecules [[$ \text{H}_{2}\text{O} $]]. This can be rewritten as [[$ 6\text{H}_{2}\text{O} $]].<br/>
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Once the acid removes the six [[$ \text{H}_{2}\text{O} $]] molecules from [[$ \text{C}_6\text{H}_{12}\text{O}_6 $]], we only have carbon left. As individual carbon atoms, they are written as multiples: [[$ 6\text{C} $]]. In other words,<br/>
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[[$$ \text{C}_6\text{H}_{12}\text{O}_6 \rightarrow 6\text{C} + 6\text{H}_{2}\text{O} $$]]<br/>
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This equation explains that the black tower structure consists of carbon atoms [[$\text{C}$]], and the gas is water vapour [[$\text{H}_2\text{O}$]].2019-10-09T09:45:36+03:00