ATOMS AND MOLECULES [IX]

                        YASH CLASSES

            ATOMS AND MOLECULES  [IX]

1.Explain law of conservation of mass.

2. 50gram of 10% lead nitrate is mixed with. 50gram. Of 10% sodium chloride. In a closed vessel. After reaction has taken place., it was found that 6.83 gram of lead chloride, boss. Precipitated. Besides the reaction mixture contain 90 gram of water and sodium nitrate. Calculate the amount of sodium nitrate formed. 

3.Name and explain 2 important laws of chemical combination.

4.What are postulates of Dalton’s atomic theory of matter?

5.How will you explain the laws of constant proportion on the basis of Dalton’s atomic theory?

6.Hydrogen and oxygen combined into different ways to produce water and hydrogen peroxide. Which of Daltons law does this observation confirm? Explain.

7.State drawbacks of Dalton’s atomic theory of matter.

8.Which postulate of Dalton atomic theory is result of the law of conservation of mass?

9.In a reaction 5.3 grams of sodium carbonate react with 6 gram of ethanoic acid, the product were 2.2. Ram of carbon dioxide, 0.9 gram water and 8.2 gram sodium ethyl net. Show that these observations are agreement with law of conservation of mass.

10.Hydrogen and oxygen combine in the ratio 1 ratio 8 the maths to form water. [B]What mass of oxygen was would be required to react completely with 3 gram of hydrogen gas?

11.Which postulate of Dalton atomic theory is result of the law of conservation of mass?

12.Which partially top Dalton’s atomic theory can explain the law of definite proportions??

13.What is an atom?

14.What is the arrangement of atoms in elements?

15.How were the names Of element derived. Define the atomic mass unit.

16.Why is it not possible to see atom with naked eyes?

17.What are molecules? Give an account of arrangement. Of course, treatment atoms in molecules.

18.Could you make distinct? Between molecule and compound.?

19.Explain the difference between 2 Cl and  Cl2.

20.Define atomicity of an element and give one example each of. Mono, Dia

 and triatomic molecules.

21.Name some molecules containing more than 4elements. What are these called?

22.What is the difference between an atom of hydrogen and a molecule of hydrogen? 

23.What is anion?

24.What are Ionic a compound?

25.What is valency? What is its use 

     uses? Do all elements have

    charged? Valency explain.

26.How is molecular formula of compound return?

Make the formula follow.

Zinc sulphate. Ammonium carbonate. Methane. Potassium sulphide. Cupric chloride. Hydrogen sulphate.