Column I
Column II
A. C12 H22 O11
(i) Element
B. Soda water
(ii) Homogeneous mixture
c. Mist
(iii) Compound
D. H2
(iv) Heterogeneous mixture
Important Questions on Is Matter around Us Pure
| Column I(dispersed phase / dispersing medium) | Column II(example) |
|---|---|
| A. Gas / solid | (i) Mist |
| B. Solid / liquid | (ii) Rubber |
| C. Liquid / gas | (iii) Shaving cream |
| D. Gas / liquid | (iv) Mud |
| Column 1 | Column 2 |
| A. Distillation | i. Solid-solid heterogeneous |
| B.Fractional distillation | ii. Liquid-liquid heterogeneous |
| C. Sublimation | iii.Solid-liquid homogeneous |
| D.Decantation | iv. Liquid-liquid homogeneous |
Reason: Sand does not sublime, ammonium chloride sublimes
Reason: Milk is a heterogeneous mixture
Reason: Alum decreases the rate of sedimentation
Read the passage and answer the following questions:
Element is the simplest form of a pure substance which cannot be divided further into another simple substance. Thus, we can say that it is made up of only one kind of atoms. Out of 114 elements known today, 92 are natural and rest are made by man. Elements can be classified as :
Metals, non-metals, metalloids, inert gases. To identify the elements, usually a symbol is assigned, e.g., C is the symbol for carbon. Elements are different from compounds, as they cannot be broken down further, whereas a compound can be broken down. Both elements and compounds are pure substances.
- Which of the following elements is not solid at room temperature?
Read the passage and answer the following questions:
Element is the simplest form of a pure substance which cannot be divided further into another simple substance. Thus, we can say that it is made up of only one kind of atoms. Out of 114 elements known today, 92 are natural and rest are made by man. Elements can be classified as :
Metals, non-metals, metalloids, inert gases. To identify the elements, usually a symbol is assigned, e.g., C is the symbol for carbon. Elements are different from compounds, as they cannot be broken down further, whereas a compound can be broken down. Both elements and compounds are pure substances.
2. What can you say about sugar?
Metals, non-metals, metalloids, inert gases. To identify the elements, usually, a symbol is assigned, e.g., C is the symbol for carbon. Elements are different from compounds, as they cannot be broken down further, whereas a compound can be broken down. Both elements and compounds are pure substances.
are all symbols of
