MCQ's About "Physical And Chemical Changes".

 PHYSICAL AND CHEMICAL CHANGES

Question 1

Which of the following is a chemical change?

(A)  boiling  (B)  distillation  (C)  evaporation  (D)  rusting

Question 2

An example of a physical change is the:

(A)  ignition of petrol in a car engine  (B)  dissolving sugar in tea

(C)  conversion of glucose to energy in the body  (D)  lighting a match

Question 3

An example of a chemical change is:

(A)  cutting bread with a knife  (B)  baking bread dough

(C)  evaporation of a puddle of water  (D)  making salt from sea water

Question 4

Which of the following statements does NOT describe a reversible change?

(A)  boiling water in a kettle  (B)  dissolving sugar in tea

(C)  melting an ice cube  (D)  exploding a firework 

Question 5

The rusting of iron is considered to be a chemical reaction because:

(A)  No heat is given out during the process.  (B)  The rust looks different from the iron.

(C)  The rust cannot be changed back to iron.  (D)  The rust forms only when water and air are 

present.

Question 6

Which word would you use to describe a substance that releases energy when it is burnt?

(A)  endothermic  (B)  reactive  (C)  exothermic  (D)  fuel

Question 7

When a fuel burns it releases heat energy. How is heat energy measured?

(A)  degrees Centigrade  (B)  grams  (C)  Joules  (D)  metres

Question 8

Which of the following is TRUE about burning fossil fuels such as coal, oil, and gas?

(A)  Clean fuels burn with a yellow flame.  (B)  Most fuels contain very little carbon.

(C)  The fuel reacts with nitrogen.  (D)  A lot of heat energy is released.

Question 9

A mixture of iron filings and sulphur was heated over a Bunsen flame for two or three minutes. When the Bunsen was taken away, the solid remained hot for several minutes. Which of the following statements is true?

(A)  The reaction was endothermic (absorbed heat).  (B)  The iron dissolved in the hot liquid sulphur.

(C)  A hot mixture of iron and sulphur was produced.  (D)  A compound of iron and sulphur was produced.

Question 10

Which of the following NEVER occurs during a chemical reaction?

(A)  Atoms are changed to different atoms.  (B)  Molecules are changed to different molecules.

(C)  Atoms are combined to form molecules.  (D)  Molecules break down into atoms.

Question 11

Which of the following is a physical change?

(A)  molten steel solidifying  (B)  zinc dissolving in hydrochloric acid

(C)  petrol burning  (D)  steel rusting

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Answers:

Question 1 (D)  Question 2 (B)  Question 3 (B)  Question 4 (D)

Question 5 (C)  Question 6 (C)  Question 7 (C)  Question 8 (D)

Question 9 (D)  Question 10 (A)  Question 11 (A)