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Physical and Chemical Changes Test - 8

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Physical and Chemical Changes Test - 8
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Iron vessels are coated with tin to:
    Solution
    Iron vessels are coated with tin as it forms a protective layer that prevents the vessels from corrosion and rusting by air and moisture. 
  • Question 2
    1 / -0
    Identify the physical change in the following:
    Solution
    Water-soluble substances dissolve in it and form solutions and can be obtained back by evaporation and evaporation is a physical change.

    In the other cases, there is the formation of a new chemical substance.

    Hence, the correct option is $$B$$.
  • Question 3
    1 / -0
    Which of these will cause a chemical change to occur ?
    Solution
    In gas burning, in a stove, the hydrocarbons from the fuel of the stove burns to form Carbon dioxide and Water vapour. As new substances are formed this is a chemical change.

    Option B is correct.
  • Question 4
    1 / -0
    Which of them is not the characteristics of a physical change?
    Solution
    1) A physical change is temporary and is usually reversible.
    2) No new substances are formed during a physical change.
    3) There is no change in mass of the substance during a physical change.
    4) There is no net absorption or release of energy during a physical change.
  • Question 5
    1 / -0
    Give reason to show that the following is a chemical change:

    Burning of magnesium in air.
    Solution
    A chemical change is one in which the identity of the substance is altered to produce one or more new substances. Burning of anything is a chemical change as new substances are formed in the process. The reaction is irreversible.
  • Question 6
    1 / -0
    The reaction given below is a:
    $${Copper \ sulphate + Iron\rightarrow Iron \ sulphate +Copper}$$
    Solution
    Since the reaction involves the formation of two new substances iron sulphate and copper, it is a chemical change. 
    So, the correct option is A. 
  • Question 7
    1 / -0
    Neutralization is:
    Solution
    Neutralization is a chemical change since it involves the formation of new compounds, salt and water.

    Example: $$HCl +NaOH\rightarrow NaCl+H_2O$$
  • Question 8
    1 / -0
    Glowing of an electric bulb is a ______ change.
    Solution
     When electricity is passed through the bulb (tungsten ) the electrons in the atoms get excited and release the energy as light in terms of photons. So no chemical reaction is taking place. It is a physical reaction.
  • Question 9
    1 / -0
    Burning of wood is a _____ change.
    Solution
    Answer should be irreversible. When wood is burnt a new substance is formed which cannot be reversed.
  • Question 10
    1 / -0
    Which of the following is a physical change ?
    Solution
    1. A physical change is reversible, a chemical change is not. For example, the freezing of water would be a physical change because it can be reversed, whereas the burning of wood is a chemical change, you can't 'unburn' it.

    2. A physical change is a change in which no new substance is formed; a chemical change results in the formation of one or more new substances. Again, consider the previous examples: Freezing water into ice just results in water molecules which are 'stuck' together, it's still $$H_2O$$. Whereas burning wood results in ash, carbon dioxide etc.

    So, solubility just changes phase and it is a physical change.
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