Question

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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?

Answer 1

Hi

Itne sare ques ek saath puchega toh kaun jawab dega aur english aur hindi ko mila kar kyon bol raha hai

Answer 2

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A polyatomic ion, also known as a molecular ion, is a charged chemical species (ion) composed of two or more atoms covalently bonded or of a metal complex that can be considered to be acting as a single unit. The prefix poly- means "many," in Greek, but even ions of two atoms are commonly referred to as polyatomic.

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The formula mass and molecular mass of water (H2O) are one and the same, while the formula and molecular mass of glucose are different from each other. The molecular mass (molecular weight) of glucose is 30 (either no units or else grams per mole), while the formula mass (formula weight) is 180.156 g/mol

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Law of Conservation of Mass. The law of conservation of mass states that the net change in mass of the reactants and products before and after a chemical reaction is zero. This means mass can neither be created nor destroyed. In other words, the total mass in a chemical reaction remains constant.

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An ion is formed by the loss or gain of electrons by an atom, so it contains an unequal number of electrons and protons. Example: Sodium ion Na+, magnesium ion Mg2+, chloride ion Cl–, and oxide ion O2–. There are two types of ions : cations.

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The molar mass is the total of all atomic weights of atoms in a molecule, expressed as grams. Hence water has 2 hydrogen atoms and one oxygen atom. The atomic weight of hydrogen is 1.00797 and for oxygen the atomic weight is 15.9994. So the molar mass of H2O is 15.9994 + (2 x 1.00797) which equals 18.01534 grams/mole.

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$valency = >$

The combining capacity of an element is called it valency.

valency of magnesium is 2.

valency of copper is 1.

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Anion vs. Cation. Ions result from atoms or molecules that have gained or lost one or more valence electrons, giving them a positive or negative charge. Those with a negative charge are called anions and those with a positive charge are called cations.

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$atomicity = >$

The number of atoms in a molecule of a single element is known as the atomicity.

Atomicity of Phosphorous is 4 as it exists as P4 & that of nitrogen is 2 as it is N2.