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Chapters
2: Force and Pressure
3: Light
4: Heat
5: Electricity
6: Sound
7: Magnetism
8: Universe and Space Science
9: Matter around us
10: Changes around us
11: Air
▶ 12: Atomic Structure
13: Water
14: Acids and Bases
15: Chemistry in Everyday Life
16: Microorganisms
17: Plant Kingdom
18: Organisation of Life
19: Movements in Animals
20: Reaching the Age of Adolescence
21: Crop Production and Management
22: Conservation of Plants and Animals
23: Libre Office Calc
![Samacheer Kalvi solutions for Science [English] Class 8 TN Board chapter 12 - Atomic Structure - Shaalaa.com](/images/science-english-class-8-tn-board_6:5f2b1b2038084cf381bfa42c826a928c.jpg "Samacheer Kalvi solutions for Science [English] Class 8 TN Board chapter 12 - Atomic Structure")
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Solutions for Chapter 12: Atomic Structure
Below listed, you can find solutions for Chapter 12 of Tamil Nadu Board of Secondary Education Samacheer Kalvi for Science [English] Class 8 TN Board.
Samacheer Kalvi solutions for Science [English] Class 8 TN Board 12 Atomic Structure Exercises [Pages 136 - 137]
Choose the best answer.
The same proportion of carbon and oxygen in the carbon dioxide obtained from different sources proves the law of ______.
reciprocal proportion
definite proportion
multiple proportion
conservation of mass
Cathode rays are made up of
neutral particles
positively charged particles
negatively charged particles
None of the above
In water, hydrogen and oxygen are combined in the ratio of _____ by mass.
1:8
8:1
2:3
1:3
Which of the following statements made by Dalton has not undergone any change?
Atoms cannot be broken.
Atoms combine in small, whole numbers to form compounds.
Elements are made up of atoms.
All atoms of an elements are alike
In all atoms of an element
the atomic and the mass number are same.
the mass number is same and the atomic number is different.
the atomic number is same and the mass number is different
both atomic and mass numbers may vary
Fill in the blanks.
______ is the smallest particle of an element.
An element is composed of ______ atoms.
An atom is made up of _______, ______ and _______.
A negatively charged ion is called _______, while positively charged ion is called _______.
_______ is a negatively charged particle.
Electron
Proton
Proton is deflected towards the _______ charged plate.
positively
negatively
Match the following.
| Law of conservation of mass | Sir William Crookes |
| Law of constant proportion | James Chadwick |
| Cathode rays | Joseph Proust |
| Anode rays | Lavoisier |
| Neutrons | Goldstein |
Answer briefly.
State the law of conservation of mass.
State the law of constant proportions.
Write the properties of anode rays.
Define valency of an element with respect to hydrogen.
Define the term ions or radicals.
What is a chemical equation?
Write the names of the following compounds.
- CO
- N2O
- NO2
- PCl5
Answer the following.
Find the valency of the element which is underlined in the following formula.
- NaCl
- CO2
- Al (PO4)
- Ba (NO3)2
- CaCl2
Write the chemical formula for the following compounds
- Aluminium sulphate
- Silver nitrate
- Magnesium oxide
- Barium chloride
Write the skeleton equation for the following word equation and then balance them.
- Carbon + Oxygen → Carbon dioxide.
- Phosphorus + Chlorine → Phosphorus pentachloride.
- Sulphur + Oxygen → Sulphur dioxide.
- Magnesium + hydrogen → Magnesium + Hydrogen chloride chloride.
Balance the following chemical equation.
- Na + O2 → Na2O3
- Ca + N2 → Ca3N2
- N2 + H2 →NH3
- CaCO3 +HCl → CaCl2 + CO2 +H2O
- Pb(NO3)2 → PbO + NO2 + O2
Higher Order Thinking Questions.
Why does a light paddle wheel placed in the path of cathode rays begin to rotate, when cathode rays fall on it?
How can we prove that the electrons carry a negative charge?
Ruthresh, Hari, Kanishka, and Thahera collected different samples of water from a well, a pond, a river, and underground water. All these samples were sent to a testing laboratory. The test result showed the ratio of hydrogen to oxygen as 1:8.
- What conclusion would you draw from the above experiment?
- Which law of chemical combination does it obey?
Solutions for 12: Atomic Structure
Samacheer Kalvi solutions for Science [English] Class 8 TN Board chapter 12 - Atomic Structure
Shaalaa.com has the Tamil Nadu Board of Secondary Education Mathematics Science [English] Class 8 TN Board Tamil Nadu Board of Secondary Education solutions in a manner that help students grasp basic concepts better and faster. The detailed, step-by-step solutions will help you understand the concepts better and clarify any confusion. Samacheer Kalvi solutions for Mathematics Science [English] Class 8 TN Board Tamil Nadu Board of Secondary Education 12 (Atomic Structure) include all questions with answers and detailed explanations. This will clear students' doubts about questions and improve their application skills while preparing for board exams.
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Concepts covered in Science [English] Class 8 TN Board chapter 12 Atomic Structure are Atoms: Building Blocks of Matter, Dalton’s Atomic Theory, Discovery of Charged Particles in Matter, Electrons (e), Protons (p), Neutrons (n), J. J. Thomson’s Atomic Model, Variable Valency, Ions (Radicals) and Its Types, Chemical Formula or Molecular Formula, Naming Chemical Compounds, Chemical Equation, Laws of Chemical Combination, Advantages and Limitations of Dalton’s Atomic Theory, Advantage and Limitations of Thomson’s Atomic Model, Different Ways to Determine Valency, Different Valent Ions, Balancing Chemical Equation, Law of Conservation of Mass, Law of Constant Proportions (Law of Definite Proportions), Atoms: Building Blocks of Matter, Valency.
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