Q3 of 56 Page 83

A change in the physical state can be brought about:

A change in the physical state can be brought about only when energy is either given to, or taken out from the system. When the energy is given, it is called endothermic reaction and when energy is released from the system, it is called exothermic reaction.

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1

Mass of one atom of oxygen is:

 2

3.42 of sucrose is dissolved in 18 g of water in a beaker. The number of oxygen atoms in the solution are:

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In a compound such as water, the ratio of the mass of hydrogen to the mass of oxygen is always:

 5

Which of the following postulates of Dalton’s atomic theory is challenged by the next generation scientists?