Advertisements
Advertisements
Question
What is the other name for impure substances ? Give two examples of impure substances.
Advertisements
Solution
Mixture is considered as an impure substance, as it contains two or more different kinds of particles or substances mixed together.
Examples: Milk, sea water
APPEARS IN
RELATED QUESTIONS
Fill in the blank
Liquids have a definite ______
Which one is a kind of matter:
Classify the following into elements and compounds :
- H2O
- He
- Cl2
- CO
- Co
You are given two liquids, one a solution and the other a compound. How will you distinguish the solution from the compound ?
Which of the following are compounds ?
- CO
- No
- NO
- Co
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.
How much water should be mixed with 12 mL of alcohol so as to obtain 12 % alcohol solution ?
Define solvent.
In what respects does a true solution differ from a colloidal solution ?
Explain what happens when a beam of light is passed through a colloidal solution.
Define the emulsion. Give one example.
9.72 g of potassium chloride dissolves in 30 g of water at 70°C. Calculate the solubility of potassium chloride at that temperature.
What is the effect of temperature on the solubility of solids in liquids ?
When the solid A is added to water, it dissolves with the evolution of a lot of heat and making little explosions to form two products B and C. The properties of products B and C are entirely different from those of solid A as well as water. Moreover, products B and C cannot be reconverted into solid A and water. When another solid D is added to water, it dissolves with the absorption of a little heat to form a product E which cools down. The product E shows the properties of both, solid D as well as water. Moreover, product E can be converted into solid D and water.
(a) What type of change occurs when solid A is dissolved in water ? Why ?
(b) What type of change occurs when solid D is dissolved in water ? Why ?
(c) Name a metal which you think could behave like solid A. Also name the products B and C.
(d) Name the solid D if it is the one which is used in making ordinary dry cells.
(e) Name the process by which D can be recovered from E.
What is the general name of the process by which tea-leaves are separated from prepared tea ?
The boiling point of liquid argon is :
Explain the meaning of the term matter with special reference to the term ‘substance’.
______ is a smallest particle.
Liquids have ______.
Gases change to liquid by the process of ______.
