State True or False against each statement :-[ 1 x 6 ]
a) Weakest intermolecular forces are in case of gases .
b) Formation of steam from water is a physical change .
c) Boiling point of water ranges from 95 degree Celsius to 100 degree Celsius .
d) During a chemical change the chemical composition must change .
e) Substances that undergo the chemical change are products
f) Iron and Sulphur when are taken together in a test tube , they react to form FeS ( Iron Sulphide )
Answers
a) Weakest intermolecular forces are in case of gases. --- True
Yes, the weakest intermolecular forces exist between gases. This is the reason why there is large intercellular spaces in between the atoms of gases and take the shape of the container in which they are stored.
b) Formation of steam from water is a physical change . --- True
In a physical change, only the physical properties of the particular substance changes which is reversible. Here, water is heated to form steam and can later be condensed to form water. This means that it is a physical change.
c) Boiling point of water ranges from 95 degree Celsius to 100 degree Celsius. --- True
Boiling point and atmospheric pressure are directly proportional to each other. So, in areas with low atmospheric pressure, the boiling point of water can decrease upto 95°C.
d) During a chemical change the chemical composition must change. --- True
In a chemical reaction, a new chemical substance is formed which has chemical properties and chemical formula that differ from that of its reactants. Therefore, we can infer that in a chemical change, the chemical composition must change.
e) Substances that undergo the chemical change are products. --- False
Substances that undergo chemical change are called reactants. The end result in a chemical change is termed as a product.
f) Iron and Sulphur when are taken together in a test tube , they react to form FeS ( Iron Sulphide) --- False
Simply mixing iron and sulphur together in a test tube will not result in iron sulphide. The mixture needs to be heated to form the new chemical substance which has properties differing from its constituents. Simple mixing of iron and sulphur is just a physical change and can be reversed.
Answer:
a) True
b) True
c) True
d) True
e) False
f) False
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