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Chapters
2: Optics
3: Thermal Physics
4: Electricity
5: Acoustics
6: Nuclear Physics
▶ 7: Atoms and Molecules
8: Periodic Classification of Elements
9: Solutions
10: Types of Chemical Reactions
11: Carbon and its Compounds
12: Plant Anatomy and Plant Physiology
13: Structural Organisation of Animals
14: Transportation in Plants and Circulation in Animals
15: Nervous System
16: Plant and Animal Hormones
17: Reproduction in Plants and Animals
18: Genetics
19: Origin and Evolution of Life
20: Breeding and Biotechnology
21: Health and Diseases
22: Environmental Management
23: Visual Communication
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Solutions for Chapter 7: Atoms and Molecules
Below listed, you can find solutions for Chapter 7 of Tamil Nadu Board of Secondary Education Samacheer Kalvi for Science [English] Class 10 SSLC TN Board.
Samacheer Kalvi solutions for Science [English] Class 10 SSLC TN Board 7 Atoms and Molecules Evaluation [Pages 102 - 104]
Choose the best answer
Which of the following has the smallest mass?
6.023 × 1023 atoms of He
1 atom of He
2 g of He
1-mole atoms of He
Which of the following is a triatomic molecule?
Glucose
Helium
Carbon dioxide
Hydrogen
The volume occupied by 4.4 g of CO2 at S.T.P ______
22.4 litre
2.24 litre
0.24 litre
0.1 litre
Mass of 1 mole of Nitrogen atom is ______
28 amu
14 amu
28 g
14 g
Which of the following represents 1 amu?
Mass of a C – 12 atom
Mass of a hydrogen atom
1/12th of the mass of a C – 12 atom
Mass of O – 16 atom
Which of the following statement is incorrect?
1 gram of C – 12 contains Avogadro’s number of atoms.
One mole of oxygen gas contains Avogadro’s number of molecules.
One mole of hydrogen gas contains Avogadro’s number of atoms.
One mole of electrons stands for 6.023 × 1023 electrons.
The volume occupied by 1 mole of a diatomic gas at S.T.P is ______
11.2 litre
5.6 litre
22.4 litre
44.8 litre
In the nucleus of `""_20"Ca"^40`, there are ______
20 protons and 40 neutrons
20 protons and 20 neutrons
20 protons and 40 electrons
40 protons and 20 electrons
The gram molecular mass of oxygen molecule is ______.
16 g
18 g
32 g
17 g
1 mole of any substance contains ______ molecules.
6.023 × 1023
6.023 × 10-23
3.0115 × 1023
12.046 × 1023
Fill in the blanks
Atoms of different elements having ______ mass numbers, but ______ atomic numbers are called isobars.
Atoms of different elements having the same number of ______ are called isotones.
Atoms of one element can be transmuted into atoms of other elements by ______
The sum of the numbers of protons and neutrons of an atom is called its ______
Relative atomic mass is otherwise known as ______.
The average atomic mass of hydrogen is ______ amu.
If a molecule is made of similar kinds of atoms, then it is called ______ atomic molecule.
The number of atoms present in a molecule is called its ______.
One mole of any gas occupies ______ ml at S.T.P.
The Atomicity of phosphorous is ______
Match the following.
| 1. | 8 g of O2 | - | 4 moles |
| 2. | 4 g of H2 | - | 0.25 moles |
| 3. | 52 g of He | - | 2 moles |
| 4. | 112 g of N2 | - | 0.5 moles |
| 5. | 35.5 g of Cl2 | - | 13 moles |
True or False: (If false give the correct statement)
Two elements sometimes can form more than one compound.
True
False
Noble gases are Diatomic.
True
False
The gram atomic mass of an element has no unit.
True
False
1 mole of Gold and Silver contain same number of atoms.
True
False
Molar mass of CO2 is 42g.
True
False
Assertion and Reason
Answer the following question using the data given below:
- Assertion: The Relative Atomic mass of aluminium is 27
- Reason: An atom of aluminium is 27 times heavier than 1/12th of the mass of the C – 12 atom.
A and R are correct, R explains the A.
A is correct, R is wrong.
A is wrong, R is correct.
A and R are correct, R doesn’t explain A.
Answer the following question using the data given below:
- Assertion: The Relative Molecular Mass of Chlorine is 35.5 a.m.u.
- Reason: The natural abundance of Chlorine isotopes are not equal.
A and R are correct, R explains the A.
A is correct, R is wrong.
A is wrong, R is correct.
A and R are correct, R doesn’t explain A.
Short answer questions
Define: Relative atomic mass
Write the different types of isotopes of oxygen and their percentage abundance.
Define: Atomicity.
Give any two examples for heterodiatomic molecules.
What is Molar volume of a gas?
Find the percentage of nitrogen in ammonia.
Long answer questions
Calculate the number of water molecules present in one drop of water which weighs 0.18 g.
N2 + 3H2 → 2NH3
(The atomic mass of nitrogen is 14, and that of hydrogen is 1)
1 mole of nitrogen (______ g) +
3 moles of hydrogen (______ g) →
2 moles of ammonia (______ g)
Calculate the number of moles in 27g of Al.
Calculate the number of moles in 1.51 × 1023 molecules of NH4Cl.
Give the salient features of “Modern atomic theory”.
Derive the relationship between Relative molecular mass and Vapour density.
Calcium carbonate is decomposed on heating in the following reaction
CaCO3 → CaO + CO2
How many moles of Calcium carbonate is involved in this reaction?
Calcium carbonate is decomposed on heating in the following reaction
CaCO3 → CaO + CO2
Calculate the gram molecular mass of calcium carbonate involved in this reaction.
Calcium carbonate is decomposed on heating in the following reaction
CaCO3 → CaO + CO2
How many moles of CO2 are there in this equation?
Solve the following problems
How many grams are there in the following?
2 moles of the hydrogen molecule, H2.
How many grams are there in the following?
3 moles of chlorine molecule, Cl2.
How many grams are there in the following?
5 moles of sulphur molecule, S8
How many grams are there in the following?
4 moles of the phosphorous molecule, P4
Calculate the % of each element in calcium carbonate. (Atomic mass: C-12, O-16, Ca -40)
Calculate the % of oxygen in Al2(SO4)3. (Atomic mass: Al-27, O-16, S -32)
Calculate the % relative abundance of B-10 and B-11, if its average atomic mass is 10.804 amu.
Solutions for 7: Atoms and Molecules
Samacheer Kalvi solutions for Science [English] Class 10 SSLC TN Board chapter 7 - Atoms and Molecules
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Concepts covered in Science [English] Class 10 SSLC TN Board chapter 7 Atoms and Molecules are Atoms: Building Blocks of Matter, Molecules, Classification of Molecules, Molecular Mass, Difference Between Atoms and Molecules, Mole Concept, Percentage Composition, Empirical and Molecular Formula, Avogadro’s Law, Relationship Between Vapour Density and Relative Molecular Mass, Classification of Molecules, Classification of Molecules, Atomic Mass.
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