Advertisements
Advertisements
Question
State whether the following statement is true or false :
Bread is an example of solid foam.
Options
True
False
Advertisements
Solution
True. Solid foam allows the gas to get dispersed in solid medium.
APPEARS IN
RELATED QUESTIONS
The inter-molecular force is maximum in
Fill in the blank :
The state of matter with definite volume and definite shape is called______
Name the scientist who studied the movement of pollen grains suspended in water through a microscope. What is this phenomenon known as?
Honey is more viscous than water. Can you suggest why?
Define matter. Give four examples of matter.
Name a liquid which can be classified as a pure substance and conducts electricity.
What are pure substances ? Give two examples of pure substances.
The property/properties which enable copper metal to be used for making electric wires is/are :
Iron powder and sulphur powder were mixed together and divided into two parts A and B. When part A was heated strongly over a burner, then a substance C was formed. The part B was, however, not heated at all. When dilute hydrochloric acid was added to substance C, then gas D was evolved and when dilute hydrochloric acid was added to part B then gas E was evolved.
- What type of substance is B ?
- What type of substance is C ?
- Name the gas (i) D, and (ii) E ?
- State one characteristic property of gas D.
- Write one test to identify gas E.
Out of a colloid, solution and a suspension :
which one has the smallest particles ?
What will happen if a saturated solution is :
- heated
- cooled
Which one of the following is not a chemical change ?
A carpenter wants to separate iron nails from saw-dust. Which method of separation should he choose ?
Name the process which can be used to recover salt from an aqueous salt solution.
With the help of a labelled diagram, describe the method of separating ammonium chloride from a mixture of ammonium chloride and common salt. Mention the difference in the properties of ammonium chloride and sodium chloride which has made this separation possible.
How is water purified on a large scale at water works ? Explain with the help of a labelled diagram. Name the substance which is added to kill germs in the drinking water supply ?
There are three liquids A, B and C, all having different densities and different boiling points. Liquids A and C are organic in nature whereas liquid B is considered to be inorganic. When liquids A and B are put together in a container, they form a single layer. On the other hand, when, liquids B and C are mixed, they form two separate layers :
(a) Which process will you use to separate a mixture of A and B ?
(b) Which method will you use to separate a mixture of B and C ?
(c) Name the liquids which would behave like (i) A (ii) B and (iii) C.
A solid mixture contains four constituents P, Q, R and S. P consists of tiny grains and it is mixed with
cement for plastering the walls. Q is a white solid which is recovered on a large scale from sea water by the
process of evaporation. R is in the form of tiny particles of a material whose corrosion is called rusting. And
S is a white solid which is used in making ordinary dry cells.
- What could P, Q, R and S be ?
- How would you separate a mixture containing P, Q, R and S ?
Rusting of an article made up of iron is called
Examples of foam are ______.
