Advertisements
Advertisements
प्रश्न
Define: Elements-
Advertisements
उत्तर
Elements : An element is the basic form of matter that cannot be broken down into simpler substances by chemical reactions.
APPEARS IN
संबंधित प्रश्न
Give a reason why elements are tabulated in a table called the ‘Periodic table’.
Explain the terms ‘chemical formula’.
Match the formulas of the following gases with their correct names :
Gases - (a) H2 (b) N2 (c) O2 (d) Cl2 (e) HCI (f) NH3 (g) CO (h) CO2 (i) SO2 (j) NO (k) NO2.
Names:
(1) Ammonia (2) Nitrogen Dioxide (3) Oxygen (4) Hydrogen (5) Nitrogen (6) Chlorine (7) Carbon Monoxide (8) Sulphur Dioxide (9) Nitrogen Monoxide (10) Carbon Dioxide (11) Hydrogen Chloride
In the chemical word equation – Zinc + Sulphuric acid → Zinc sulphate + Hydrogen
The molecular equation is :
Zn + H2SO4 → ZnSO4 + H2[g].
State what [g] represents.
State the type of element for the following:
Sulphur
State the type of element for the following:
Iodine
State the type of element for the following:
Radon
Give the symbol of the following element:
Sulphate
Write the radical of the following valency:
Calcium
Give the formula of the following gas:
Carbon monoxide
