A1

Question 1

define acid

Answer 1

substances that dissociates in water to form h+ ions

Question 2

give an example of an acid

Answer 2

HCL—> H+ + CL-

Question 3

define base

Answer 3

substances that react with acids to form water and salt

Question 4

define alkali

Answer 4

a base that dissolves in water to form OH- ions

Question 5

define amphoteric

Answer 5

substances that can act as both acid and base

Question 6

what is the chemical equation for aluminium oxide?

Answer 6

AL2O3

Question 7

is alumina chemically inert?

Answer 7

yes it is, however under some conditions it is not, for example it can react with hot bases and acids

Question 8

is alumina amphoteric? and why

Answer 8

yes because it can react with hot bases and acids only

Question 9

what are some of the uses of alumina?

Answer 9

since it is chemically inert, can be used for filler, paint, sunscreen and glass

it is also an effective desiccant.

Question 10

what ion does an element become if it loses an electron?

Answer 10

postive ion

Question 11

what ion does an element become if it gains an electron?

Answer 11

negative ion

Question 12

what is the equation of alumina acting as a base?

Answer 12

AL2O3+6HCL—> 2ALCL3+3H20

Question 13

what is the equation for alumina acting as a acid?

Answer 13

AL2O3+6NaOH+3H2O—>2Na2AL(OH)6