Advertisements
Advertisements
Question
Define the term: Element
Advertisements
Solution
Element is a substance which cannot be split up into two or more simple substances by usual chemical methods of applying heat, light or electric energy; for example, hydrogen, oxygen and chlorine.
APPEARS IN
RELATED QUESTIONS
Choose the most appropriate answer
A solvent of Iodine is
Tick the most appropriate answer
Solutions are
- heterogeneous mixtures.
- compounds
- homogeneous mixtures.
- elements
Match the columns.
| column A | column B |
|
1. to separate grain from chaff |
a. filtration |
| 2. to saparate sawdust from water | b. sedimentation and deeantation |
| 3. to separate iodine from sodium chloride | c. winnowing |
| 4. to separate iron fillings from sand | d.sublimation |
|
5. it is used to separate sand and water |
e maganetic separation |
|
|
f .handpicking |
What is the difference between a pure substance and a mixture ?
Give Two Examples for Each of the Following: Inert Gases
Answer the following question:
When iron is mixed with sulphur at room temperature, it does not form a compound. Why?
Match the Columns:
| Column A | Column B | ||
| (a) | Metals | (i) | Non-Reactive |
| (b) | Molecules | (ii) | Brittle |
| (c) | Non-Metals | (iii) | Lustrous |
| (d) | Noble Gases | (iv) | Smallest unit of Compound |
Indicate whether the following statement is true or false:
Metals reflect light and are good conductors of electricity
Tick (√) the correct alternative from the choice given for the following statement.
The most abundant elements in the universe are
Tick (√) the correct alternative from the choice given for the following statement
The hardest naturally occurring substance
Write the names of elements from the following symbol:
Zn
Select the correct answer from the choice in the bracket.
The positively charged particle of an atom.
Select the correct answer from the choice given below to complete the sentence :
An example of a monoatomic molecule is ___________.
Give a reason for the following statement :
The filter paper made into a cone & placed in a funnel for filtering out the solid particles in a solid-liquid mixture should be moistened before placing it.
What are elements? What are they made of?
Assertion: Air is a mixture of elements only.
Reason: Only nitrogen, oxygen and neon gases exist in air.
Oxygen is very essential for us to live. It forms 21% of air by volume. Is it an element or compound?
Complete the table:
| Element | Latin Name | Symbol |
| Mercury | ______ | Hg |
| Lead | Plumbum | ______ |
| Iron | ______ | Fe |
| Potassium | Kalium | ______ |
Name the two elements which are derived from the country.
