Acids have characteristics of being corrosive and having a sour taste, while alkalis are bitter and slippery. The key way to differentiate between acids and alkalis is by using litmus paper, with acids turning litmus paper red and alkalis turning it blue. Most acids are corrosive and can burn the skin upon contact. Acids come from both plant and animal sources.

5. 1-Give 2 characteristics for acids:
--------------------,-----------------------.
2-Give 2 characteristics for alkalis:
--------------------,-----------------------.
3-How to differentiate between acid and
alkali?
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6. 1-Give 2 characteristics for acids:
Corrosive ,sour taste.
2-Give 2 characteristics for alkalis:
bitter ,slippery.
3-How to differentiate between acid and
alkali?
using litmus paper.

7. Acid sour
 It comes from the latin word acidus.
 Alkali Ashes
 It comes from an arabic word meaning ashes.

8. Most acids
are
corrosive
which burn
when get in
contact to
skin.

9. Plant origin Animal origin
 Citric acid .
 Tartaric acid .
 Ascorbic acid .
 Methanoic acid.
 Hydrochloric acid.
 Lactic acid.
 Uric acid.
 Methanoic acid.