Sub- Mathematics Assignment:- 07

Algebra - 02

01. Write down the square of the following:

(a)

(b)

(c)

(d)

(e)

(f)

02. Resolve into factors:-

(a) – 81

(b) – 100

(c) 1 - 64

(d) –

(e) 4 – ( + 2xy + )

(f) + 4ab + 4 -

03. Write down the cubes of the followings:-

(a)

(b)

(c)

(d)

(e)

(f)

04. Resolve into factors:-

(a)

(b)

(c)

(d)

(e)

(f)

Subject: Chemistry

Class note on Salts & Preparation of salt by neutralization reaction

Grade-7

Definition:

Salts are ionic compounds that are formed when a metallic & ammonium ion

replaces one or more hydrogen ions of an acid.

Example:

Sodium chloride Ammonium chloride

NaOH + HCl NaCl + H2O NH4OH + HCl NH4Cl + H2O

Here, from both the reaction is observed that the metallic & ammonium ion is

replaced by Hydrogen ion.

Naming Salts:

The name of a salt has two parts.

The first part comes from the metal, metal oxide or metal carbonate used in the reaction.

The second part comes from the acid.

The name of the salt can be determined by looking at the reactants

For example

Hydrochloric acid always produces salts that end in chloride and contain

the chloride ion, Cl–.

Other examples:

Sodium hydroxide reacts with hydrochloric acid to produce sodium chloride.

Zinc oxide reacts with sulfuric acid to produce zinc sulfate.

Types of salts on basis of Solubility:

I. Soluble II. Insoluble

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Preparation of salts by neutralization/ Titration method:

Subject:Chemistry

Worksheet on Reactivity series & Displacement reaction.

Grade-7

Now it’s time for practicing:

Please Start with the answer of question number5

1. Complete the reactions by using reactivity series. If no reaction will happen

then NO REACTION should be written in right side of that reaction.

a) Calcium +Silver Sulfate

b) Magnesium + Lead nitrate

c) Potassium + Aluminum nitrate

d) Silver + Copper Chloride

e) Silver + Sodium Nitrate

f) Calcium + Zinc Chloride

2. Reactions of metals with acids:

a) Calcium + Nitric Acid

b) Sodium + Sulfuric Acid

c) Lithium + Hydrochloric acid

d) Calcium + Sulfuric Acid

e) Zinc + Nitric Acid

f) Platinum + Sulfuric Acid

3. Complete the blanks:

a) magnesium + iron nitrate → magnesium nitrate + ___________________

b) magnesium + ___________________ → magnesium sulfate + zinc

c) _________________ + copper sulfate → magnesium sulfate +

_________________

d) zinc + ___________________ → zinc sulfate + copper

e)zinc + iron chloride → ___________________ + ___________________

f) Sodium + Water _______________________ +_____________________

g) Copper + Water ________________________________

4. Explain the following things:

a) Thermite reaction.

b) Why Sodium is kept under oil?

5.How will you produce Sodium Sulfate by using Neutralization

method.

Subject:Chemistry

Worksheet on Reactivity series & Displacement reaction.

Grade-7

Now it’s time for practicing:

Please Start with the answer of question number5

1. Complete the reactions by using reactivity series. If no reaction will happen

then NO REACTION should be written in right side of that reaction.

a) Calcium +Silver Sulfate Calcium sulfate + silver

b) Magnesium + Lead nitrate Magnesium nitrate + lead

c) Potassium + Aluminum nitrate Potassium nitrate + Aluminum

d) Silver + Copper Chloride No reaction

e) Silver + Sodium Nitrate No reaction

f) Calcium + Zinc Chloride Calcium chloride + zinc

2. Reactions of metals with acids:

a) Calcium + Nitric Acid Calcium nitrate + Hydrogen

b) Sodium + Sulfuric Acid Sodium sulfate + Hydrogen

c) Lithium + Hydrochloric acid Lithium chloride + Hydrogen

d) Calcium + Sulfuric Acid Calcium sulfate + Hydrogen

e) Zinc + Nitric Acid Zinc nitrate + Hydrogen

f) Platinum + Sulfuric Acid No reaction

3. Complete the blanks:

a) magnesium + iron nitrate → magnesium nitrate + Hydrogen

b) magnesium + Sulfuric acid → magnesium sulfate + zinc

c) Magnesium + copper sulfate → magnesium sulfate + Copper

d) zinc + Copper sulfate → zinc sulfate + copper

e)zinc + iron chloride →Zinc chloride + Iron

f) Sodium + Water Sodium Hydroxide + Hydrogen

g) Copper + Water No reaction

4. Explain the following things:

a) Thermite reaction.

A thermite reaction is basically iron oxide (rust) reacting with aluminum to

produce molten iron. The products are aluminum oxide, elemental iron, and a large

amount of heat. The reactants are commonly or thermite mixture is aluminum

powder and iron oxide (rust) powder. When the mixture is heated, it starts reacting

as the aluminum is more reactive than the iron and aluminum forms stronger and

stable b Word equation:

Iron Oxide + Aluminum powder Aluminum Oxide + Molten Iron

So, aluminum is displacing Iron because aluminum is more reactive than iron.

onds with oxygen than iron.

b) Why Sodium is kept under oil?

Because sodium is reactive so it can be contaminated by reaction with

moisture,oxygen & cabon di oxide

5.How will you produce Sodium Sulfate by using Neutralization

method.

Sodium hydroxide & Sulfuric acid when be neutralized.

VII CC BDS Worksheet on 7th April 2020

Topic: The Rule of Independent Sultans (1338-1538), Paper 1, 2(D), Pg 68.

One Liner Answer 18

a. Who was Haji Iliyas?

…………………………………………………………………………………………………………………………………………………….

b. What long title he assumed?

…………………………………………………………………………………………………………………………………………………….

c. Why he called himself Shah-I-Bangala or King of Bengal?

…………………………………………………………………………………………………………………………………………………….

d. When Sultan Firuz invaded Bengal again? Who defeated him?

…………………………………………………………………………………………………………………………………………………….

e. Who invaded Bengal in 1353?

…………………………………………………………………………………………………………………………………………………….

f. Who was the real founder of Shahi Dynasty in Bengal?

…………………………………………………………………………………………………………………………………………………….

g. Who was Sikandar Shah? How many years he ruled Bengal? When did he die?

…………………………………………………………………………………………………………………………………………………….

h. Why Sultans of Delhi did not try to capture Bengal after Sikandar’s success?

…………………………………………………………………………………………………………………………………………………….

i. Who exchanged embassies with the Chinese Emperor? Who was he?

…………………………………………………………………………………………………………………………………………………….

j. What did Hafiz of Iran do to pierce Islam?

…………………………………………………………………………………………………………………………………………………….

k. Why was Ghiyasuddin fortunate?

…………………………………………………………………………………………………………………………………………………….

l. Who murdered Saifuddin Hamza Shah? Who took advantage of his death?

…………………………………………………………………………………………………………………………………………………….

m. Why Raja Ganesh could not stay in power for long?

…………………………………………………………………………………………………………………………………………………….

n. Who forced Raja Ganesh to abdicate the kingdom and how?

…………………………………………………………………………………………………………………………………………………….

…………………………………………………………………………………………………………………………………………………….

o. Who was Jadu? How many times he had to change his religion? What was his muslim name?

……………………………………………………………………………………………………………………………………………………

p. When Jadu AKA Jalaluddin Mohammad Shah returned to Islam for the last time?

…………………………………………………………………………………………………………………………………………………….

q. When Bengali became the court language?

…………………………………………………………………………………………………………………………………………………….

r. What other language was the court language alongside Bengali during that reign?

…………………………………………………………………………………………………………………………………………………….

Name: ………………………………………………………………………….. Sec.: ………. Date: …………………………..