CLASS 10
PERIODIC CLASSIFICATION OF ELEMENTS
LESSON NOTES
REFER THE BOTTOM OF THE PAGE FOR PAGE NO.
PERIODIC CLASSIFICATION OF ELEMENTS
LESSON NOTES
REFER THE BOTTOM OF THE PAGE FOR PAGE NO.
Thursday 18 October 2018
Monday 15 October 2018
class 9 holiday homework
(refer the blog's of your respective teachers)
Maths - worksheet in the blog
science- worksheet in the blog
Hindi- Blog
Social science- Group activity on Food security
Geography- Choose any one topic from the following and write about it.( Pictures ,Map ,Causes Prevention, effects)
Tsunami
Drought
Land slides
English-
1.Article on the topic (200 words)
Sedentary lifestyles and unhealthy eating habits leads to obesity
2Story writing (150- 250 words)
.ENDING. WITH... HE TOUCHED HIS GURU'S FEET AND ASKED FOR AN APOLOGY
BEGINNING WITH...AS I OPENED THE WINDOW i SAW...
3LETTER-
You recently upgraded the band of your net.However the speed is quite low and it is difficult to load websites.You have complained to customer sevices, but they are extremely unhelpful.Write a letter to General Manager World Tel internet Service provider complaining about the service
(refer the blog's of your respective teachers)
Maths - worksheet in the blog
science- worksheet in the blog
Hindi- Blog
Social science- Group activity on Food security
Geography- Choose any one topic from the following and write about it.( Pictures ,Map ,Causes Prevention, effects)
Tsunami
Drought
Land slides
English-
1.Article on the topic (200 words)
Sedentary lifestyles and unhealthy eating habits leads to obesity
2Story writing (150- 250 words)
.ENDING. WITH... HE TOUCHED HIS GURU'S FEET AND ASKED FOR AN APOLOGY
BEGINNING WITH...AS I OPENED THE WINDOW i SAW...
3LETTER-
You recently upgraded the band of your net.However the speed is quite low and it is difficult to load websites.You have complained to customer sevices, but they are extremely unhelpful.Write a letter to General Manager World Tel internet Service provider complaining about the service
Sunday 14 October 2018
Wednesday 10 October 2018
CLASS-9 HOLIDAY H W
LESSON-3 ATOMS AND MOLECULES(A-4 SIZE PAPER)
LESSON-3 ATOMS AND MOLECULES(A-4 SIZE PAPER)
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1
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What is an atom?
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2
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How many atoms are present in one molecule of ozone?
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3
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Define the law of constant proportion.
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4
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What is the ratio between masses of (a) hydrogen and
oxygen in H2O (b) nitrogen and hydrogen in NH3? [Atomic
mass of H = 1 u, O = 16 u, N = 14 u]
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5
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What is the ratio between masses of carbon and oxygen in
CO2?
[Atomic mass of C = 12 u, O = 16 u] |
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6
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As per the law of definite proportions carbon and oxygen
combine in a ratio of 3 : 8. Compute the mass of oxygen gas that would be
required to react completely with 6 g carbon.
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7
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Name the anion and cation which constitute the molecule of
magnesium oxide.
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8
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Name the international organisation which approves the
name given to the elements.
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9
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The oxide of aluminium has a chemical formula Al2O3.
State the valency of Al.
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10
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Write the names of the following compounds:
(a) Al2(SO4)3 (b) NH4OH |
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11
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What is the formula of ammonium chloride?
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12
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(a) Define atomic mass unit.
(b) Hydrogen and oxygen combine in the ratio 1: 8 by mass to form water. What mass of oxygen gas would be required to react completely with 4 g of hydrogen gas? |
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13
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(a) Give one word for the following:
(i) Positively charged ion (ii) A group of atoms carrying a charge. (b) Mention any two important rules for writing a chemical formula. |
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14
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(a) How would you differentiate between a molecule of an
element and a molecule of a compound? Write one example of each type.
(b) Write the chemical formula of baking soda. |
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15
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Define atomicity. Give an example of each of monoatomic,
diatomic, tetra-atomic and polyatomic molecules.
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16
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Classify the following compounds as diatomic, triatomic
and polyatomic molecules:
HCl, H2, H2O and NH3. |
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17
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How will you prove experimentally the law of conservation
of mass?
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18
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(a) When 5 g of calcium is burnt in 2 g of oxygen then 7 g
of calcium oxide is produced. What mass of calcium oxide will be produced
when 5 g of calcium is burnt in 20 g of oxygen. Which law of chemical
combination will govern your answer? State the law.
(b) Write the chemical formula of calcium oxide. |
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19
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(i) Write the full form of IUPAC.
(ii) 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? |
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20
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Write the formulae of
(a) Magnesium hydroxide (b) Hydrogen sulphide (c) Potassium chloride (d) Calcium oxide (e) Barium chloride (f) Sodium carbonate |
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21
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An element ‘X’ forms an oxide with formula X2O3
(a) State the valency of X. (b) Write the formula of (i) chloride of X, (ii) sulphate of X. |
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22
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Using criss-cross method, write the chemical formulae of
copper chloride, calcium sulphate and sodium phosphate.
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23
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(a) What are polyatomic ions?
(b) Write the formulae and names of the compounds formed by combination of (i) Fe3+ and SO42– (ii) NH4+ and CO32– |
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24
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Write the formulae of:
(a) Sodium chloride (b) Aluminium oxide (c) Ammonium sulphate |
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25
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(a) Define polyatomic ion.
(b) Write the name of the compound (NH4)2SO4 and mention the ions present in it. |
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