7th Standard Syllabus & Materials
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TN 7th Tamil பருவம் -1 இயல் 1 - அமுதத்தமிழ் - ஒன்றல்ல இரண்டல்ல Important Questions And Answers Study Material - QB365 Set A
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Published on: 13/05/2022
QB365 provides detailed and simple solution for every Book back Questions in class 7 Science Subject. It
will helps to get more idea about question pattern in every book back questions with solution.
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.
Classify the following as elements and compounds.
Water, Common salt, Sugar, Carbon dioxide, Iodine and Lithium
2.
Classify the following as metals, non-metals and metalloids .
Sodium, Bismuth, Silver, Nitrogen, Silicon, carbon, chlorine, Iron, copper.
3.
Write the symbols for the following elements and classify them as solid, liquid and gas.
Aluminum, carbon, chlorine, mercury, hydrogen and helium
4.
Define the following terms with an example of each:
a. Element
b. Compound
c. Metal
d. Non-metal
e. Metalloid
5.
What do you understand by chemical formula of a compound? What is its significance?
1.
Elemenls: Iodine and Lithium.
Compounds: Water, Common salt, Sugar and Carbon dioxide.
2.
Metals: Sodium, Bismuth, Silver, Iron, Copper.
Non-metals: Nitrogen, Carbon, Chlorine.
Metalloids: Silicon.
3.
| Element | Symbol | Nature |
| Aluminum | Al | Solid |
| Carbon | C | Solid |
| Chlorine | Cl | Gas |
| Mercury | Hg | Liquid |
| Hydrogen | H | Gas |
| Helium | He | Gas |
4.
a) Element:
Simplest form of matter is called an element.
Ex: Sodium Chlorine, Hydrogen and Oxygen.
b) Compound:
A compound is formed by the chemical combination of the atoms of two or more elements in definite proportions.
Ex: Water (H2O).
c) Metal:
Metals are generally hard and shiny elements.
Ex: Copper, Lead
d) Non-metol:
Non-metals are generally dull and soft.
Ex: Oxygen, Hydrogen, Chlorine.
e) Metalloid:
Metalloids exhibit the properties of both metals and non-metals.
Ex: Silicon, Arsenic, Boron
5.
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.
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Tamilnadu Stateboard 7th Standard Subjects
Tamilnadu Stateboard Standards
