Kerala SCERT Class 8 Basic Science Chapter 15 Solutions Question Answer Solution Here. Kerala Board Class 8 Students can find Here 15th Chapter Solutions Notes provide by our Teacher. Important Question Answer from Chapter 15 Solutions.
- Board- Kerala Board.
- Class – 8.
- Subject – Basic Science Part 2
- Chapter – 15.
- Chapter Name – Solutions.
- Topic – Question Answer Solution.
1.) Define the following-
a.) Mass Percentage-the amount of solute that gets dissolved in a solution can be expressed in % using this method. This denotes the amount of solute present in hundred grams of the solution.
Mass %= mass of solute/mass of solution into 100
b.) Parts per million(PPM)- the numbers of parts by mass of a solute present in ten lakh parts by mass of a solutions. PPM is used to express the presence of very small amounts of a solute.
c.) Supersaturated solution-the solution in which maximum amount of solute has been dissolved is known as a saturated solution.
d.) Concentration of solution- concentration of a solution refers to the amount of solute dissolved in a fixed amount of a solvent. A solution which contains large amount of solute is known as a concentrated solution.
e.) Solution- solution is the mixtures of solute and solvent.
f.) Solubility- the amount of a solute in grams required to converts 100g of a solvent into a saturated solution at a given temperature is known as the solubility of the solute in that solvent.
Answer the following in short.
2.) What is concentration of solution , write note.
Ans- concentration of a solution refers to the amount of solute dissolved in a fixed amount of solvent. A solution containing a small amount of solute is known as a dilute solution and that which contains large amount of solute is known as a concentrated solutions.
The solution containing a greater amount of solute can be said to be of higher concentration.
3.) Explain about saturated and unsaturated solution.
Ans- the solution in which maximum amount of solute has been dissolved is known as a saturated solution. The solution obtained by dissolving maximum amount of solute at a given temperature is known as a saturated solution.
The solution before reaching saturation is known as an unsaturated solution.
Unsaturated solution can dissolves more amounts of solute. The amounts of common salt and ammonium chloride required to make a saturated solution using the same under the same condition differ.
4.) Define the term mixture. Give classification of mixtures.
Ans- mixture is the mixing of different solutions with each other. There are two types of mixtures –
Homogeneous mixture – the constituents is the same through the mixtures is known as homogeneous mixtures. Example- sugar solution.
Heterogeneous solution- the constituents in a mixture are not distributed uniformly is known as heterogeneous mixtures. Example- mixture of salt and sand solution.
Answer the following in brief.
1.) Complete the following according to true solution , colloidal and suspension solution. Define these all.
Examples- Ink, muddy, water, fog, atmospheric, air, milk, sugar solution , dilute rice water.
Ans- true solution- the size of solute particles present in solution is so small that it cannot be seen with the naked eye. The particles present in solution are so small in size , they cannot scatter a beam of light.
Colloidal – the solute means colloidal size is comparatively bigger so they scatter a beam of light thus making the path of the beam is visible.
Suspension- particles of suspension are big enough to be seen with the naked eye. The light falling on them is reflected almost completely.
True solution | Colloidal | suspension |
Sugar solution , water | Milk, ink, muddy , fog, | dilute rice water |
2.) What is stabilizer. Explain in details about the chemicals which are used in soft drinks to make them attractive.
Ans- some chemical substances used as stabilizers in soft drinks to prevent the particles from getting settled are-
a.) Brominated vegetable oil
b.) Sucrose ester of rosin
c.) Glyceryl ester of rosin
The chemicals which are used in soft drinks to make them attractive are following-
Chemical substances | Juice or food materials to which it is added | use |
Tartrazine | Food material | Colouring agent yellow |
Erythrosine | Food materials | Clouring agent red |
Vanillin | Food materials | Taste enhancer |
Phosphoric acid | Soft drinks | To give sour taste |
Allyl hexanoate | Food material | For fragrance pineapple |
Mcq
1) —– is add in soft drink to give sour taste .
a) Acetic acid
b) Lactic acid
c) Ketone
d) Phosphoric acid
Ans- d) phosphoric acid
2) The solution have solid, —– and —- states.
a) Liqid and gas
b) Plasma and liqid
c) Water and gas
d) None of the above
Ans- a) liquid and gas
3) —– is used in food material for fragrance—-
A) Alcohol
B) Aicd
C) Base
D) Ally hexanoate
Ans- d) ally hexanoate
4) The particles can not be separated by filteration are called—–
A) Solution
B) Colloide
C) Catalyst
D) Suspention
Ans- a) solution
5) The chemical substances used in soft drinks are known as—–
A) Unsaturated substances
B) Stabilizers
C) Suspension
D) Saturated solution
Ans- b) stabilizers
6) The solution obtained by dissolving maximum amount of solute at a given temperature is known as—-
a) Unstaurated solution
b) Saturated solution
c) Concentrated solution
d) None of the above
Ans- b) saturated solution
7) the pottasium have solubility in g/100g is ——
A) 36.1
B) 37.2
C) 37.8
D) 100
Ans- b) 37.2
Kerala SCERT Class 8 Science Solutions Question Answer
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