Chemical Reactions and Equation-Chemical Equations (CBSE Class-10 Science): Questions 10 - 15 of 33

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Question number: 10

» Chemical Reactions and Equation » Chemical Equations » Writing a Chemical Equation

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How do we represent chemical changes in chemistry?

Question number: 11

» Chemical Reactions and Equation » Chemical Equations » Balanced Chemical Equations

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Balance the following chemical equations:

1. H2 + O2 – > H2O

2. S8 + O2 – > SO3

3. HgO – > Hg + O2

4. Zn + HCl – > ZnCl2 + H2

5. Na + H2O – > NaOH + H2

6. N2 + H2 – > NH3

7. N2 + O2 – > N2O

8. CO2 + H2O – > C6H12O6 + O2

Explanation

1.2H2 + O2 > 2 H2O

2. S8 + 12O 2 > 8 SO3

3.2 HgO > 2Hg + O2

4. Zn + 2HCl > ZnCl2 + H2

5.2Na + 2H2O > 2NaOH + H2

6. N2… (30 more words) …

Question number: 12

» Chemical Reactions and Equation » Chemical Equations » Writing a Chemical Equation

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What does a word chemical equation represents?

Question number: 13

» Chemical Reactions and Equation » Chemical Equations » Writing a Chemical Equation

Essay Question▾

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Write the balanced chemical equation for the following

(a) Sodium hydroxide solution is treated with acetic acid to form sodium acetate and water.

(b) Ethanol is warmed with ethanoic acid to form ethyl acetate in the presence of concentrated H 2 SO 4 .

(c) Ethene is burnt in the presence of oxygen to form carbon dioxide, water and releases heat and light.

(d) Nitrogen gas is treated with hydrogen gas in the presence of a catalyst at 773K to form ammonia gas.

Explanation

(a) NaOH (sodium hydro-oxide) + CH3COOH (acetic acid) = CH3COONa (sodium acetate) + H2O (water) , as number of atoms on both sides are equal it is a balanced equation.

(b) C2H5OH (ethanol) + CH3COOH (ethanoic acid) =… (61 more words) …

Question number: 14

» Chemical Reactions and Equation » Chemical Equations » Balanced Chemical Equations

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Animesh took a magnesium ribbon (cleaned) and burned it on a flame. The white powder formed was taken in a test tube and water was added to it. He then tested the solution formed with red and blue litmus paper. What change was seen? Why?

Question number: 15

» Chemical Reactions and Equation » Chemical Equations » Writing a Chemical Equation

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What is the chemical reaction in which heat is evolved is known as?

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