assignment 4B.html

Assignment 4B

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> 1. Which is the correct statement about an acid?

A.  It is a corrosive, bitter tasting substance.
B.  It is a corrosive, sour tasting substance that turns blue litmus paper red.
C.  It is a non-corrosive, sour tasting substance that turns blue litmus paper red.
D.  It is a non-corrosive, bitter tasting substance that turns blue litmus paper red.

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> 2. Which is the correct statement about a base?

A.  It is a corrosive, bitter tasting substance.
B.  It is a corrosive, sour tasting substance that turns blue litmus paper red.
C.  It is a non-corrosive, sour tasting substance that turns blue litmus paper red.
D.  It is a non-corrosive, bitter tasting substance that turns blue litmus paper red.

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> 3. Which of the following acid and base combinations can be used in cooking?

A.  acetic acid, sodium bicarbonate
B.  hydrochloric acid, sodium bicarbonate
C.  hydrochloric acid, sodium hydroxide
D.  sulphuric acid, sodium hydroxide

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> 4. Which of the following is used as an antacid?

A.  vinegar
B.  ammonia
C.  sodium hydroxide
D.  sodium bicarbonate

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5. You learned about eight properties of acids and bases.  Which properties are common to both acids and bases?  ( /1 mark) >

 

6. You learned about eight properties of acids and bases.  Which four properties of acids and bases are different?  ( /4 marks) >

 

> 7. What is litmus?

A.  Litmus is a plant.
B.  Litmus is a lichen.
C.  Litmus is an indicator.
D.  Litmus is a natural substance made from the hydrangea plant.

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> 8. An indicator is used to determine

A.  the colour of an acid or a base
B.  the strength of an acid or a base
C.  if a substance has a sour or a bitter taste
D.  whether a substance is an acid or a base

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9. Complete the table by giving the pH of the following substances and tell whether it is an acid or a base.  ( /5 marks)

 

> 10. Distilled water has a pH = 7.  Distilled water is

A.  an acid
B.  a base
C.  neutral
D.  none of the above

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> 11. Substance A has a pH = 9.3 and substance B has a pH = 11.5.  Which substance is more basic?

A.  Substance A
B.  Substance B
C.  neither
D.  cannot be determined from pH

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> 12. How many times more acidic is a solution with a pH of 2 compared to a solution with a pH of 3?

A.  1
B.  2
C.  3
D.  10

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> 13. How many times more basic is a solution with a pH of 11 compared to a solution with a pH of 9?

A.  2
B.  10
C.  100
D.  1000

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> 14. What colour will an acidic solution turn if bromothymol blue is added to it?

A.  blue
B.  clear
C.  yellow
D.  pink

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> 15. What colour will an acidic solution turn if phenolphthalein is added to it?

A.  blue
B.  clear
C.  yellow
D.  pink

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> 16. What colour will a basic solution turn if bromothymol blue is added to it?

A.  blue
B.  clear
C.  yellow
D.  pink

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> 17. What colour will a basic solution turn if phenolphthalein is added to it?

A.  blue
B.  clear
C.  yellow
D.  pink

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18. Complete the table below by filling in the missing information.  Give the colour of the indicators, answer yes or no for the conductivity, and state whether it is an acid or a base.  ( /4 marks) >

 

19. Complete the table below by filling in the missing information. ( /4 marks) >