The chemical formula of a compound means the symbolic representation of the composition of a compound. From the chemical formula of a compound, we can know the number and kinds of atoms of different elements that constitute the compound. For example, from the chemical formula CO₂ of carbon dioxide,Read more
The chemical formula of a compound means the symbolic representation of the composition of a compound. From the chemical formula of a compound, we can know the number and kinds of atoms of different elements that constitute the compound. For example, from the
chemical formula CO₂ of carbon dioxide, we come to know that one carbon atom and two oxygen atoms are chemically bonded together to form one molecule of the compound, carbon dioxide.
Mass unit equal to exactly one- twelfth the mass of one atom of carbon - 12 is called one atomic mass unit. It is written as 'u'. For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-3/
Mass unit equal to exactly one- twelfth the mass of one atom of carbon – 12 is called one atomic
mass unit. It is written as ‘u’.
The postulate of Dalton's atomic theory which can explain the law of definite proportion is “The relative number and kind of atoms in a given compound remains constant”. For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-3/
The postulate of Dalton’s atomic theory which can explain the law of definite proportion is “The
relative number and kind of atoms in a given compound remains constant”.
The postulate of Dalton's atomic theory which is a result of the law of conservation of mass is “Atoms are indivisible particles, which can neither be created nor destroyed in a chemical reaction”. For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-9/science/chaptRead more
The postulate of Dalton’s atomic theory which is a result of the law of conservation of mass is
“Atoms are indivisible particles, which can neither be created nor destroyed in a chemical
reaction”.
It is given that the ratio of hydrogen and oxygen by mass to form water is 1:8. Then, the mass of oxygen gas required to react completely with 1g of hydrogen gas is 8g. Therefore, the mass of oxygen gas required to react completely with 3g of hydrogen gas is 8 × 3g = 24 g. For more answers visit toRead more
It is given that the ratio of hydrogen and oxygen by mass to form water is 1:8. Then, the mass of
oxygen gas required to react completely with 1g of hydrogen gas is 8g. Therefore, the mass of
oxygen gas required to react completely with 3g of hydrogen gas is 8 × 3g = 24 g.
In a reaction, sodium carbonate reacts with ethanoic acid to produce sodium ethanoate, carbondioxide, and water. Sodium + Ethanoic → Sodium + Carbon + Water Carbonate acid ethanoate dioxide Mass of sodium carbonate = 5.3g (Given) Mass of ethanoic acid = 6g (Given) Mass of sodium ethanoate = 8.2g (GiRead more
In a reaction, sodium carbonate reacts with ethanoic acid to produce sodium ethanoate,
carbondioxide, and water.
Mass of sodium carbonate = 5.3g (Given)
Mass of ethanoic acid = 6g (Given)
Mass of sodium ethanoate = 8.2g (Given)
Mass of carbon dioxide = 2.2 (Given)
Mass of water = 0.9g (Given)
Now, total mass before the reaction = (5.3 + 6)g
= 11. 3g
and total mass after the reaction = (8.2 + 2.2 + 0.9)g
= 11.3g
Therefore, Total mass before the reaction = Total mass after the reaction
Hence, the given observations are in agreement with the law of conservation of mass.
What is meant by the term chemical formula?
The chemical formula of a compound means the symbolic representation of the composition of a compound. From the chemical formula of a compound, we can know the number and kinds of atoms of different elements that constitute the compound. For example, from the chemical formula CO₂ of carbon dioxide,Read more
The chemical formula of a compound means the symbolic representation of the composition of a compound. From the chemical formula of a compound, we can know the number and kinds of atoms of different elements that constitute the compound. For example, from the
chemical formula CO₂ of carbon dioxide, we come to know that one carbon atom and two oxygen atoms are chemically bonded together to form one molecule of the compound, carbon dioxide.
For more answers visit to website:
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Write down the names of compounds represented by the following formulae Al₂(SO₄)₃.
(i) Al(SO₄) ₃→ Aluminium sulphate (ii) CaCl₂→ Calcium chloride (iii) K₂SO₄→ Potassium sulphate (iv) KNO₃ → Potassium nitrate (v) CaCO₃→ Calcium carbonate For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-3/
(i) Al(SO₄) ₃→ Aluminium sulphate
(ii) CaCl₂→ Calcium chloride
(iii) K₂SO₄→ Potassium sulphate
(iv) KNO₃ → Potassium nitrate
(v) CaCO₃→ Calcium carbonate
For more answers visit to website:
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Write down the names of compounds represented by the following formulae Al₂(SO₄)₃.
(i) Al(SO4)3→ Aluminium sulphate (ii) CaCl2→ Calcium chloride (iii) K2SO4→ Potassium sulphate (iv) KNO3 → Potassium nitrate (v) CaCO3→ Calcium carbonate For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-3/
(i) Al(SO4)3→ Aluminium sulphate
(ii) CaCl2→ Calcium chloride
(iii) K2SO4→ Potassium sulphate
(iv) KNO3 → Potassium nitrate
(v) CaCO3→ Calcium carbonate
For more answers visit to website:
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Write down the formulae of sodium oxide.
(i) Sodium oxide → Na₂O (ii) Aluminium chloride → AlCl₃ (iii) Sodium suphide → Na₂S (iv) Magnesium hydroxide → Mg(OH)₂ For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-3/
(i) Sodium oxide → Na₂O
(ii) Aluminium chloride → AlCl₃
(iii) Sodium suphide → Na₂S
(iv) Magnesium hydroxide → Mg(OH)₂
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Why is it not possible to see an atom with naked eyes?
The size of an atom is so small that it is not possible to see it with naked eyes. Also, atom of an element does not exist independently.
The size of an atom is so small that it is not possible to see it with naked eyes. Also, atom of an
See lesselement does not exist independently.
Define the atomic mass unit.
Mass unit equal to exactly one- twelfth the mass of one atom of carbon - 12 is called one atomic mass unit. It is written as 'u'. For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-3/
Mass unit equal to exactly one- twelfth the mass of one atom of carbon – 12 is called one atomic
mass unit. It is written as ‘u’.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-3/
Which postulate of Dalton’s atomic theory can explain the law of definite proportions?
The postulate of Dalton's atomic theory which can explain the law of definite proportion is “The relative number and kind of atoms in a given compound remains constant”. For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-3/
The postulate of Dalton’s atomic theory which can explain the law of definite proportion is “The
relative number and kind of atoms in a given compound remains constant”.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-3/
Which postulate of Dalton’s atomic theory is the result of the law of conservation of mass?
The postulate of Dalton's atomic theory which is a result of the law of conservation of mass is “Atoms are indivisible particles, which can neither be created nor destroyed in a chemical reaction”. For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-9/science/chaptRead more
The postulate of Dalton’s atomic theory which is a result of the law of conservation of mass is
“Atoms are indivisible particles, which can neither be created nor destroyed in a chemical
reaction”.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-3/
Hydrogen and oxygen combine in the ratio of 1:8 by mass to form water. What mass of oxygen gas would be required to react completely with 3 g of hydrogen gas?
It is given that the ratio of hydrogen and oxygen by mass to form water is 1:8. Then, the mass of oxygen gas required to react completely with 1g of hydrogen gas is 8g. Therefore, the mass of oxygen gas required to react completely with 3g of hydrogen gas is 8 × 3g = 24 g. For more answers visit toRead more
It is given that the ratio of hydrogen and oxygen by mass to form water is 1:8. Then, the mass of
oxygen gas required to react completely with 1g of hydrogen gas is 8g. Therefore, the mass of
oxygen gas required to react completely with 3g of hydrogen gas is 8 × 3g = 24 g.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-3/
In a reaction, 5.3 g of sodium carbonate reacted with 6 g of ethanoic acid. The products were 2.2 g of carbon dioxide, 0.9 g water and 8.2 g of sodium ethanoate. Show that these observations are in agreement with the law of conservation of mass.
In a reaction, sodium carbonate reacts with ethanoic acid to produce sodium ethanoate, carbondioxide, and water. Sodium + Ethanoic → Sodium + Carbon + Water Carbonate acid ethanoate dioxide Mass of sodium carbonate = 5.3g (Given) Mass of ethanoic acid = 6g (Given) Mass of sodium ethanoate = 8.2g (GiRead more
In a reaction, sodium carbonate reacts with ethanoic acid to produce sodium ethanoate,
carbondioxide, and water.
Sodium + Ethanoic → Sodium + Carbon + Water
Carbonate acid ethanoate dioxide
Mass of sodium carbonate = 5.3g (Given)
Mass of ethanoic acid = 6g (Given)
Mass of sodium ethanoate = 8.2g (Given)
Mass of carbon dioxide = 2.2 (Given)
Mass of water = 0.9g (Given)
Now, total mass before the reaction = (5.3 + 6)g
= 11. 3g
and total mass after the reaction = (8.2 + 2.2 + 0.9)g
= 11.3g
Therefore, Total mass before the reaction = Total mass after the reaction
Hence, the given observations are in agreement with the law of conservation of mass.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-3/