7. Write scientific reason.
a. Hydrogen is combustible, oxygen helps
combustion, but water helps to extinguish
fire.
b. Constituent substances of a colloid cannot
be separated by ordinary filtration.
c. Lemon sherbat has sweet, sour and salty
taste and it can be poured in a glass.
d. A solid matter has the properties of
definite shape and volume.
Answers
Answer:
a) Water cools the combustible material so that its temperature is reduced below its ignition temperature. This prevents the fire from spreading. ... So, the fire is extinguished. Therefore hydrogen is a combustible gas and oxygen is a supporter of combustion but water extinguishes fire.
b) Constituent particles of a colloid have very small size as compare to the pores or holes of filter paper. This means that filtering any colloid with filter paper will allow the colloid particle to pass through it and thus no residue is left. Hence, it is not a good idea to filter any colloid with filter paper.
c)Lemon sherbet has sweet and salty taste and it can be poured in a glass because lemon is citrus extract and corrosive taste.
d) The solid matter has the property of definite shape and volume because the molecules present in a solid are tightly packed so the molecules do not flow and there is no change in volume and force of attraction between the molecules will be very high that shows rigidity of molecule.
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