2cu o2

Define a chemical equation.

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2cu o2

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Now that we understand that chemical reactions occur with a simultaneous change in energy, we can apply the concept more broadly. To start, remember that some chemical reactions are rather difficult to perform. For example, consider the combustion of carbon to make carbon monoxide:. In reality, this is extremely difficult to do. Given the opportunity, carbon will react to make another compound, carbon dioxide:. Is there a way around this? It comes from the understanding that chemical equations can be treated like algebraic equations, with the arrow acting like the equals sign. Like algebraic equations, chemical equations can be combined, and if the same substance appears on both sides of the arrow, it can be canceled out much like a spectator ion in ionic equations. For example, consider these two reactions:.

2cu o2

In association with Nuffield Foundation. Copper foil is folded into the shape of an envelope before being heated in a Bunsen burner. On cooling, the foil can be opened and it can be seen that where there was no contact with oxygen the copper remained unreacted. In this experiment, students fold a piece of copper foil into the shape of an envelope, before heating it using a Bunsen burner. When the foil has cooled, students can open the envelope and discover that where there was no contact with oxygen the copper remained unreacted.

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