VORKSHEET
Fill in the blanks:
gas,
conductor of electricity
3. Organic acids are
nature,
1. The phenolphthalein give pink colour in
2 Acids react with metal carbonates to give
4 Acids and bases getionised in water due to their
On dilution of a strong acid, its acidic strength
6. Ca(OH), (limewater) has
7. NH,OH is the example of
8. The aqueous solution of a soap shows
9. The salts are generally formed by
10. The sting of honey bee contains
11. The dry HCl gas cannot change the colour of pH paper due to
12. The bleaching action of bleaching powder is due to release of
13. Chemically, the plaster of Paris is
taste.
can u plz tell me the answer of all these questions
Answers
Answer:
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A gas in its normal condition is a non-conductor of electricity
1)Phenolphthalein is often used as an indicator in acid–base titrations. For this application, it turns colorless in acidic solutions and pink in basic
2)When acids react with carbonates, such as calcium carbonate
3)Organic acids (C1–C7) are widely distributed in nature
4)
6) Limewater is the common name for a dilute aqueous solution of calcium hydroxide. Calcium hydroxide, Ca(OH)2
7)Hydroxylamine is an inorganic compound with the formula NH2OH. The pure material is a white, unstable crystalline, hygroscopic compound. However, hydroxylamine is almost always provided and used as an aqueous solution. It is used to prepare oximes, an important functional group.
8)Aqueous solution of soap above critical micelle concentration lead to formation of colloidal solution. Tyndall effect is a characteristic of colloidal solution in which colloidal particles show a coloured appearance when sunlight is passes through it and seen from the perpendicular side.
9)Salt, in chemistry, substance produced by the reaction of an acid with a base.
10)honeybee contains histamine
11)The colour of litmus paper is changed by the hydrogen ions. Dry HCl does not contain hydrogen ions (H). Acid (For example: HCI) dissociates only in aqueous solution to give ions. Since, in this case, neither HCI is in the aqueous form nor litmus paper is wet. Therefore, the colour of litmus paper does not change.
12) photo is there
13) Plaster of Paris is a chemical compound consisting of fine white powder, which hardens when exposed to moisture and allowed to dry. Its chemical formula is CaSO4. 1/2H2O and is better known as calcium sulfate hemihydrate
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