Advertisements
Advertisements
प्रश्न
Define the term: Element
Advertisements
उत्तर
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
संबंधित प्रश्न
Fill in the blank
Chalk powder dissolved in water is an example of a Chalk powder dissolved in water is an example of a _________.
State four differences between compounds and mixtures.
Name: a Metal Which is brittle
Give two examples of Non-metals.
Give three differences between metals and non-metals.
Give two examples of the following.
Non-metals which are lustrous
Give reason: Graphite is used to make a lead of the pencils.
Indicate whether the following statement is true or false:
Elements are made up of compounds
Indicate whether the following statement is true or false:
Molecules can exist independently.
Tick (√) the correct alternative from the choice given for the following statement.
Brass and bronze are
Differentiate between the terms –
elements, compounds & mixtures.
Elements are classified into – Metals – Non-metals – Metalloids – Noble gases. State which of A, B, C, D is a –
1. Metallic element
2. Non-metallic element
3. Metalloid
4. Noble gas.
A: Is non-malleable, non-ductile & a poor conductor of electricity ___________
B: Has lustre, is malleable and ductile & a good conductor of heat ___________
C: Is unreactive and inert and present in traces in the air _________
D: Shows properties of both metals and non-metals ___________
Select the correct answer from the choice given below.
The type of molecule- bromine
Write the names of elements from the following symbol:
Cu
Write the names of elements from the following symbol:
Pt
Select the correct answer from A, B, C, D & E for the statement given below :
A non-metal that is lustrous.
Name the process associated with the following
A fine beam of light entering through a small hole in a dark room illuminates the particles in its paths.
______ is a mixture of gases.
How are elements classified?
