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Chemical Reactions - Evidence

Chemical Reactions - Evidence. D. Crowley, 2007. Chemical Reactions - Evidence. To identify evidence for a chemical reaction. Which metal?. Using your sheet, cut out the five descriptions of metals Then stick them in your book, from the most reactive (sodium) to the least reactive (gold).

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Chemical Reactions - Evidence

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  1. Chemical Reactions - Evidence D. Crowley, 2007

  2. Chemical Reactions - Evidence • To identify evidence for a chemical reaction

  3. Which metal? • Using your sheet, cut out the five descriptions of metals • Then stick them in your book, from the most reactive (sodium) to the least reactive (gold)

  4. Previous reactions • In this unit, you have seen the following reactions: - metal + oxygen→ metal oxide metal + water → metal hydroxide + hydrogen metal + acid → salt + hydrogen

  5. Chemical reaction • Can you think of at least three things which prove a chemical reaction has taken place? • New compounds form – with new properties • There may be a colour change • Heat may be released • A gas may be given off • The pH may have changed (compound formed is acidic / alkaline)

  6. Demo • Look at the demo of some compounds being formed • You need to observe what is happening: - • Has a gas been given off? • Is there a colour change • Is there a pH change • Is there a temperature variation?

  7. Demo + Worksheet • Watch the repeated demo • This time, fill in your sheet ticking if a gas was given off; there was a colour change; there was a pH change; or if there was a variation in temperature…

  8. Anagrams • Look at the following, jumbled up words • See if you can rearrange them: - e.g. talme become metal nno-melat ouncdpmo dplacmenteis nedghroy Tals ractivee acdi → → → → → → → non-metal compound displacement hydrogen salt reactive acid

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