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
Explanation:
a)Hydrogen is flammable, but oxygen is not. Flammability is the ability of a combustible material with an adequate supply of oxygen (or another oxidiser) to sustain enough heat energy to keep a fire going after it has been ignited. ... Therefore, water has its own properties, which helps to extinguish fire.
b)Constituent substances of a colloid cannot be separated by ordinary filtration because the size of the particles in a colloids(or colloidal solution) is bigger than those in a true solution but smaller than those in suspension.It is in between 1nm to 100nm in diameter.
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.