| << Chapter < Page | Chapter >> Page > |
(A) ACIDS AND SOME OF THEIR FUNCTIONS
used for cleaning brickwork and cement;
reduces the pH levels of swimming pool water.
used in artificial fertilisers, dyes and explosives;
present in plastics.
probably the most important acid in South Africa;
an effective drying agent;
used in the preparation of fertilisers, dyes, paper and glue.
used to flavour cold drinks;
used by dentists in dental cement.
used in many disinfectants;
an effective germicide.
the acid contained in oranges (citrus fruit).
the acid contained in tomatoes.
used in baking powder.
the acid in aspirin tablets.
this is vitamin C.
the acid formed when milk turns sour;
lactic acid is also formed in muscles, particularly after vigorous exercise.
(B) BASES AND SOME OF THEIR FUNCTIONS
used in the manufacturing of soap;
(also known as caustic soda)
used as a cleanser in drainage pipes.
present in milder soaps;
(lime water/whitewash)
used in the agricultural and building.Industries
this is used as a purgative, as well as for other purposes (purgatives encourage the evacuation of the bowels).
is a general domestic cleaning agent;
is used as smelling salts (sal volatile) because of its pungent smell;
also is an ideal stain remover
Test:
Try to list at least eight acids and three alkalis and their uses (on a separate sheet of paper).
Learning Outcome 2: The learner will know and be able to interpret and apply scientific, technological and environmental knowledge.
Assessment Standard 2.2: We know this when the learner categorises information.
Notification Switch
Would you like to follow the 'Natural sciences grade 7' conversation and receive update notifications?
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|