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(Tips & Tricks)Important questions which is required to know a 9th standered students
(Tips & Tricks)Important questions which is required to know a 9th standered students
1. Define polyatomic ion. Give one example.
2. What is formula unit of mass? How is it different from molecular mass?
3. What is Law of conservation of mass and Law of constant proportions?
4. What is an ion? Explain the types of ion with examples.
5. Find the molecular mass of H2O.
6. Define the term valency. What is the valency for magnesium and copper?
7. What is the difference between cation and anion?
8. What is atomicity? What is the atomicity of phosphorus and nitrogen?
9. Find the number of atoms in 0.5 mole of C atom.
10. Find the mass of 1.5 mole of CO2 molecule.
11. Calculate the formula unit mass of NaCl and CaCl2.
12. What is the difference between molecules 2O and O2?
Dalton’s Atomic Theory(important)
1. Every matter is made up of very small or tiny particles called atoms.
2. Atoms are not divisible and cannot be created or destroyed in a chemical reaction.
3. All atoms of a given element it are same in size, “mass and chemical properties.
4. Atoms of different elements are different in size, mass and chemical properties.
5. Atoms combine in the ratio of small whole number to form compounds.
6. The relative number and kinds of atoms are constant in a given compound.
Atom
Atoms are the smallest particles of an element which can take reaction.
Atomicity
The number of atoms constituting a Molecule is known as its atomicity.
Name of the elementAtomicity
Molecules formula Helium Monoatomic He Neon Monoatomic Ne Argon Monoatomic Ar Sodium Monoatomic Na Iron Monoatomic Fe Aluminium Monoatomic Al Hydrogen Di-atomic H2 Oxygen Di-atomic O2 Chlorine Di-atomic Cl2 Nitrogen Di-atomic N2 Phosphorus Polyatomic (Tetra) P4 Sulphur
Ions
The charged particles (atoms) are called ions, they charge or negative chaarge on it :
Negatively charged ionis called anion
Positively charge ion is called cation (Na+).
Valency
The combining capacity of an element is known as its valency: Valency is used to fmd out how atom of an element will combine with the atom of another element to form a chemical compound.
(Every atom want, to become stable, to do so it may loose, gain or share electrongs.
(i) If an atom consists of 1, 2 or 3 electrons in its valgncesI ell then its valency is 1, 2 or 3 respectively,
(ii) If an atom consists of 5, 6 or 7 electrons in the outermost shell, then it will gain 3, 2 or 1 electron respectively and its valency will be 3, 2 or 1 respectively.
(ii) If an atom has 4 electrons in the outermost shell than it will she this electron and hence its valency will be 4.
(iv) If an atom has 8 electrons in the outermost shell then its valency is 0.
Polyatomic(Octa)
S8
1. Every matter is made up of very small or tiny particles called atoms.
2. Atoms are not divisible and cannot be created or destroyed in a chemical reaction.
3. All atoms of a given element it are same in size, “mass and chemical properties.
4. Atoms of different elements are different in size, mass and chemical properties.
5. Atoms combine in the ratio of small whole number to form compounds.
6. The relative number and kinds of atoms are constant in a given compound.
Atom
Atoms are the smallest particles of an element which can take reaction.
Atomicity
The number of atoms constituting a Molecule is known as its atomicity.
Name of the element | Atomicity | Molecules formula | |
| Helium | Monoatomic | He | |
| Neon | Monoatomic | Ne | |
| Argon | Monoatomic | Ar | |
| Sodium | Monoatomic | Na | |
| Iron | Monoatomic | Fe | |
| Aluminium | Monoatomic | Al | |
| Hydrogen | Di-atomic | H2 | |
| Oxygen | Di-atomic | O2 | |
| Chlorine | Di-atomic | Cl2 | |
| Nitrogen | Di-atomic | N2 | |
| Phosphorus | Polyatomic (Tetra) | P4 | |
| Sulphur
Ions
The charged particles (atoms) are called ions, they charge or negative chaarge on it :
Negatively charged ionis called anion
Positively charge ion is called cation (Na+).
Valency
The combining capacity of an element is known as its valency: Valency is used to fmd out how atom of an element will combine with the atom of another element to form a chemical compound.
(Every atom want, to become stable, to do so it may loose, gain or share electrongs.
(i) If an atom consists of 1, 2 or 3 electrons in its valgncesI ell then its valency is 1, 2 or 3 respectively,
(ii) If an atom consists of 5, 6 or 7 electrons in the outermost shell, then it will gain 3, 2 or 1 electron respectively and its valency will be 3, 2 or 1 respectively.
(ii) If an atom has 4 electrons in the outermost shell than it will she this electron and hence its valency will be 4.
(iv) If an atom has 8 electrons in the outermost shell then its valency is 0.
| Polyatomic(Octa) | S8 |
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