The end of year exams are looming. It is important that you finish the year strongly and don’t switch off early. Read through the notes and watch the videos on acids and bases before attempting the questions at the end
We have studied the reactions of acids with:
bases
metals
carbonates
We have used word equations to produce fully balanced chemical equations in three steps. For a little more information on this process have a look at this post about the space shuttle being blasted into orbit on the back of a huge pop test.
the basic word equations we use are:
acid + base —–> salt + water
acid + metal —–> salt + hydrogen
Acid + carbonate —–> salt + carbon dioxide + water
Use these word equations to answer the questions below.
We are working through a practise paper from the Ministry website
You should have completed question 1 last night. Do question 2 tonight. See last night’s post for instructions on how to hand this work in.
Also revise writing chemical formulae, word equations, fully balanced chemical equations and the reactions of acids and bases by watching the embeded videos below. They are based on lessons and lesson notes I did with you earlier in the year. There is video of practical work you carried out when you were making salts by neutralising acids with bases.
We have used word equations to produce fully balanced chemical equations in three steps. For a little more information on this process have a look at this post about the space shuttle being blasted into orbit on the back of a huge pop test.
the basic word equations we use are:
acid + base —–> salt + water
acid + metal —–> salt + hydrogen
Acid + carbonate —–> salt + carbon dioxide + water
Use these word equations to answer the questions below.
Acids react with water molecules to form hydrogen ions . Acidic solutions have an excess of hydrogen ions over hydroxide ions. The acids we commonly use in the laboratory are:
Hydrochloric, HCl
Sulphuric, H2SO4
Nitric, HNO3
.
Neutralising acids with bases.
The acidity of an acid can be neutralised by removing the excess of hydrogen ions
Substances that remove hydrogen ions and neutralise acids are called bases.
Chemically all metal oxides and hydroxides are bases.
Bases that are soluble in water have a special name. They are called alkalis e.g. Sodium hydroxide and potassium hydroxide
