D. Crowley, 2007.  To know what happens when an acid reacts with a metal oxide Friday, August 14, 2015.

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Presentation transcript:

D. Crowley, 2007

 To know what happens when an acid reacts with a metal oxide Friday, August 14, 2015

 Today you are going to undertake an experiment with acid + metal oxide  Using your sheet, list three things we may expect to see if a chemical reaction has taken place…  Temperature change  Fizzing  pH change  Colour change  Gas given off

 So far, we have seen lots of reactions  Using the sheet, see if you can note the correct answers metal + oxygen → metal oxide metal + water → metal hydroxide + hydrogen metal + acid → salt + hydrogen  Today we are going to look at metal oxides + acid…

 Metal oxides are the compounds that form when a metal reacts with oxygen - they are all bases (alkali) metal + oxygen  metal oxide copper + oxygen  copper oxide magnesium + oxygen  magnesium oxide sodium + oxygen  ______ _____ iron + oxygen  ____ _____

 Metal oxides are the compounds that form when a metal reacts with oxygen - they are all bases (alkali) metal + oxygen  metal oxide copper + oxygen  copper oxide magnesium + oxygen  magnesium oxide sodium + oxygen  sodium oxide iron + oxygen  ____ _____

 Metal oxides are the compounds that form when a metal reacts with oxygen - they are all bases (alkali) metal + oxygen  metal oxide copper + oxygen  copper oxide magnesium + oxygen  magnesium oxide sodium + oxygen  sodium oxide iron + oxygen  iron oxide

 Today you are going to react a metal oxide with acid, forming a salt + water  The metal oxide we are going to use is copper oxide  Metal oxides are bases (alkali) - what do you think will happen when you add this to an acid?

 Add small amounts of copper oxide in a beaker  Add 25cm 3 sulphuric acid, and stir  Keep adding, until some un-reacted copper oxide remains at the bottom  Filter the solution, removing the un-reacted copper oxide  Transfer the filtrate to an evaporating basin  Heat gently, until about one third of the water has evaporated  Leave the solution to cool, and examine the crystals…

 As the metal oxide is a base, it has neutralised the acid, leaving a salt + water  Write down in your own words what the copper crystals looked like, followed by a word (and symbol) equation

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