List Two Problems that Arise Due to the Use of Detergents Instead of Soaps. - Science


List two problems that arise due to the use of detergents instead of soaps.



Two problems arise because of the use of detergents instead of soap:-

i. Soaps are biodegradable, while detergents are non-biodegradable; hence, detergents accumulate in the environment and cause problems.

ii. Certain phosphate additives are added to detergents. These phosphate additives act as nutrients for algae which form a thick green scum over the river water and upset the animal life in the river.

Concept: Soap
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2014-2015 (March) All India Set 1

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Differentiate between Toilet soap and Laundry soap.

Why do soaps not form lather in hard water?

Distinguish between esterfication and saponification reaction with the help of the chemical equations for each. 

What are the raw materials required for making soap in a laboratory (or at home)?

Why is soap not suitable for washing clothes when the water is hard?


How is soap made? Write a word equation involved in soap making.


The soap molecule has a ______.

Give the reason of formation of scum when soaps are used with hard water.



A student is testing water to know which is best for cleansing purposes with soaps. He would find that the cleansing action of soaps is best when he uses water obtained from

(a) rain

(b) tap

(c) hand pump

(d) pond

A student takes 4 mL of distilled water in each of four test tubes I, II, III and IV, and then dissolves an equal amount of four different salts namely NaCl in I, CaCl2 in II, MgCl2 in III and KCl in IV. He then adds 8 drops of the given soap solution to each test tube and shakes the contents of the test tube 10 times. In which test tubes will enough lather (foam) be formed ?
(A) I and II
(B) II and III
(C) I and IV
(D) III and IV

Give a scientific explanation.

Soap forms a precipitate in hard water. 

Differentiate between:
Detergents and Soaps.

Fill appropriate term in the blank:

Soap is a salt of _______ and sodium hydroxide.

Write an answer to the following question.

How will you check with the help of soap powder whether water is hard?

Write an answer to the following question.

What is meant by 'surface activity'?

Write an answer to the following question.

Name three chemicals responsible for the surface activity of various detergents.

What are the differences between Soap and synthetic detergent?

What are the similarities and differences between Bath soap and soap for washing clothes?

Explain Why Soap cannot be used in hard water.

Explain Why Synthetic detergents are superior to soap.

Explain Why Often coloured spots are formed on clothes during washing.

Soaps were originally made from ______.

The saponification of a fat or oil is done using _____ solution for hot process.

Water, coconut oil, and _______ are necessary for soap preparation.

Match the following

1. Soap C6H5 OH
2. Cement CaSO4.2H2O
3. Fertilizers NaOH
4. Gypsum RCC
5. Phenol NPK

Arrange the following statements in correct sequence

  1. Pour that solution into an empty matchbox, soap can be obtained after drying.
  2. Take the necessary quantity of water in a jar.
  3. Then add coconut oil drop by drop and stir it well.
  4. Add concentrated sodium hydroxide in the jar and allow it to cool.
  5. Try this soap to wash your hand kerchief.
  6. Cover your work area with old newspaper.

What are the three main constituents of soap?

TFM in soaps represents ______ content in soap.

The alkaline hydrolysis of fatty acids is termed as ______

We are using ______ to remove strong stains on the clothes.

How does soap clean clothes?

______ to remove strong strains on the clothes.

______ are substances which can undergo chemical changes to produce certain materials.

Why do soaps not work effectively in hard water?

What are the similarities between Soap and synthetic detergent.


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