7th Standard Syllabus & Materials
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TN 7th Tamil рокро░рпБро╡роорпН -1 роЗропро▓рпН 1 - роЕроорпБродродрпНродрооро┐ро┤рпН - роТройрпНро▒ро▓рпНро▓ роЗро░рогрпНроЯро▓рпНро▓ Important Questions And Answers Study Material - QB365 Set A
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TN 7th Tamil рокро░рпБро╡роорпН -1 роЗропро▓рпН 1 - роЕроорпБродродрпНродрооро┐ро┤рпН - роОроЩрпНроХро│рпН родрооро┐ро┤рпН Important Questions And Answers Study Material - QB365 Set A
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Published on: 18/09/2019
Matter Around Us
Download Tamil Nadu 7th Standard Science question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
Questions + Answers key
Take MCQ Science Test1.
Name the elements is air?
2.
What is the atomicity of H2SO4?
3.
What is a chemical formula?
4.
What is the Latin name of Sodium?
5.
What is the expansion of IUPAC.
6.
How many elements are known at present?
7.
Classify the following as metals, non-metals and metalloids .
Sodium, Bismuth, Silver, Nitrogen, Silicon, carbon, chlorine, Iron, copper.
8.
Write the symbols for the following elements and classify them as solid, liquid and gas.
Aluminum, carbon, chlorine, mercury, hydrogen and helium
9.
What do you understand by chemical formula of a compound? What is its significance?
10.
Write the chemical formula and name the elements present in the following compounds:
a. Sodium chloride
b. Potassium hydroxide
c. Carbon dioxide
d. Calcium oxide
e. Sulphur dioxide
1.
Nitrogen, Oxygen, small amounts of Argon and Carbon-di-oxide. Other gases such as Neon, Helium and Methane are present in traceable amounts
2.
H2SO4
H2 = 2 Hydrogen atoms
S = 1 Sulphur atom
O4 = 4 Oxygen atoms
Hence its atomicity is 2 + 1 + 4 = 7
3.
A chemical formula is a symbolic representation of one molecule of an element or a compound
4.
Natrium
5.
International Union of Pure and Applied Chemistry.
6.
118.
7.
Metals: Sodium, Bismuth, Silver, Iron, Copper.
Non-metals: Nitrogen, Carbon, Chlorine.
Metalloids: Silicon.
8.
| Element | Symbol | Nature |
| Aluminum | Al | Solid |
| Carbon | C | Solid |
| Chlorine | Cl | Gas |
| Mercury | Hg | Liquid |
| Hydrogen | H | Gas |
| Helium | He | Gas |
9.
i) Chemical formula is a symbolic representation of one molecule of an element or a compound
ii) It provides information about the elements present in a molecule and the number of atoms of each element.
Significance:
The types of atoms and the number of each types of atoms in one molecule of substance can be known by chemical formula.
10.
| Compound | Chemical fromula | Name of the elements | |
| a. | Sodium chloride | NaCI | Sodium (Na), Chlorine (CI) |
| b. | Potassium hydroxide | KOH | Potassium (K), Oxygen (O), Hydrogen(H) |
| c. | Carbon dioxide | CO2 | Carbon (C), Oxygen (O2) |
| d. | Calcium oxide | CaO | Calcium (C), Oxygen (O2) |
| e. | Sulphur dioxide | SO2 | Sulphur (S), Oxygen (O2) |
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Tamilnadu Stateboard 7th Standard Subjects
Tamilnadu Stateboard Standards
