Looking for the eleventh elegance bankruptcy 1 Basic Concepts of chemistry notes? Here we've got shared the first 12 months of Chemistry Chapter 1 Short Questions Notes.
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| 1st Year Chemistry Notes Chapter 1 Short & Long - 11th Class Notes pdf |
1st Year Chemistry Notes Chapter 1 Short - 11th Class Notes pdf
01. 23 g of sodium and 238 g of uranium have the same range of atoms in them. Explain (imp) 23 g of Na = 1 mole
238 g of Uranium = 1 mole
because 1 mole of every detail has Avogadro’s range of atoms. Hence, 23g of Na (1 mole) and 238g of Uranium (1 mole) incorporate the same range of atoms i.e. 6.02 × 1023.
02. Mg atom is two times heavier than carbon. Explain (imp)
The atomic mass of an atom is the mass this is received after evaluating it with carbon-12. The atomic mass of Mg involves be 24 amu and that of carbon is 12 amu. It method that Mg is two times heavier than carbon.
03. a hundred and eighty g of glucose and 342 g of sucrose have an equal no of molecules however one-of-a-kind no of atoms are found in them. Explain
a hundred and eighty g of glucose = 1 mole of glucose
342 g of sucrose = 1 mole of sucrose
Both are one mole and feature 6.02 x 1023 no. of molecules. The molecule of glucose (C6H12O6) consists of 24 atoms however that of sucrose (C12H22O11) consists of forty-five atoms.
06. Two grams of H2, sixteen g of CH4 and 44g of CO2 occupy one after the other the extent of 22.414 dm3, even though the dimensions and hundreds of 3 gases are very one-of-a-kind from every other. Explain.
2 g of H2 = 1 mole of H2
sixteen g of CH4 = 1 mole of CH4
forty-four g of CO2 = 1 mole of CO2
One mole of any fueloline at STP has 22.414 dm3 volumes. All the gases have one mole as a result consisting of 22.414 dm3 extents.
In gases, the gap among molecules is about three hundred instances extra than their diameter. Thus, the extent occupied with the aid of using fueloline molecules doesn’t depend on the length or mass of fueloline molecules and it most effective relies upon the range of molecules
07. The Law of conservation of mass needs to be obeyed all through the stoichiometric calculation.
According to the regulation of conservation of mass, the range of reactants and merchandise continues to be equal all through a chemical reaction. Now in stoichiometric calculations, it is meant that the number of reactants and merchandise do now no longer alternate all through a chemical reaction, in any other case calculation might not be viable. So, all through stoichiometric calculations balanced equation is used to make certain that the regulation of conservation of mass is obeyed.
08. Many chemical reactions taking vicinity in our environment contain the proscribing reactants.
(a) Burning of herbal fueloline entails proscribing reactant. Oxygen withinside the surroundings is in extra quantity however herbal fueloline consumes in advance as a result it's miles a proscribing reactant.
(b) Burning of petrol in an engine additionally entails proscribing reactants. Oxygen is in extra quantity however petrol consumes in advance as a result it's miles a proscribing reactant.
09. No person neon atom withinside the pattern of the detail has a mass of 20.18 AMU.
Neon has 3 isotopes 20Ne, 21Ne, and 22Ne with relative abundance as 90.92%, zero.26%, and eight.82%. The common atomic mass of Ne is 20.18 amu. This common mass relies upon the no. of viable isotopes and their relative abundance.
10. One mole of water has moles of bonds, 3 moles of atoms, ten moles of electrons, and twenty-8 moles of overall essential debris in it. Explain.
The shape of water is H x ------- O -------- x H In one mole of water, moles of bonds = 2 mole In one mole of water, moles of O = 1 mole In one mole of water, moles of H = 2 moles In one mole of water, moles of atom = three moles In one mole of water, moles of electrons = 10 moles (eight moles of O and a couple of moles of H).
In one mole of water, moles of essential debris of O = 8P+8N+8e- = 24 In one mole of water, moles of essential debris of H = 2P+2e- = four Total essential debris = 28.
11. Under what circumstance ions are produced?
Ions from Elements Cations (advantageous ions) are fashioned with the aid of using the elimination of electrons. During this process, electricity is absorbed and it's miles an endothermic process. Anions (terrible ions) are fashioned with the aid of using the addition of electrons. During this process, electricity is launched and it's miles an exothermic process. Ions from an Ionic compound produced ions while dissolved in water or while it's miles infused state. Ions from Molecular compound Molecular compound produced ions while a bombardment of electrons or passing of α-rays takes vicinity on them.
12. How does proscribe reactant controls the range of merchandise?
A proscribing reactant is fed on in advance and prevents the similar formation of merchandise even though the extra reagent is a gift withinside the vessel. So, prescribing the reactant controls the formation of the product.
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