Nomenclature of Hydrocarbons

                         ORGANIC CHEMISTRY                                                                           

Draw the complete structural formula and condensed molecular formula for each compound.

IUPAC Name	Complete Structural Formula	Condensed Formula
butane
2-methylhexane
3-ethyl-2-methylnonane
propene
4-methyl-2-heptene
ethyne
5,6-dimethyl-2-octyne
cyclopropane
1,3-diethylcyclohexane

Physics : chapter : Heat : grade 9

                                                                 Heat

1. Two bodies at different temperatures are placed in contact. State the direction in which
     heat will flow
2.  Define temperature and give its S.I units?
3.  Why does a piece of ice when touched with hand appears cold?
4. Name two substances which contract on heating
5.  Distinguish between Heat and Temperature
6. State three factors which affect the increase in length of rod on heating.
7. Loops are joined in metal pipes. Why?
8.  The unit calorie is related to _____________
9. The unit of coefficient of linear expansion is ______________
10. State the effect of temperature on the density of a substance.
11. What do you mean by anomalous expansion of water?
12.  What do understand by real and apparent expansion of a liquid.
13. Write a relation between Celsius and the Fahrenheit scales of temperature
14.  What do you understand by zero on kelvin scale. Write its value?

15. Express 100 degree Fahreinheit  in degree celsius and kelvin?

16. Express 100 K in degree celsius?

17. Name the liquid which is good conductor of heat

18.Name different modes of transfer of heat.

19. Name the material used for making the handles of cooking utensiles. Give reason for your answer.

20.Write some consequences of convection?

21. By the process of convection, heat always transferred vertically upwards. Give reason.

22. Why is a Ventilator provided in a room?

23. Write three differences between conduction, convection and radiation

Chemistry : Balancing the equations

Balance the equations

1.       H2 + O2 → H2O

2.       H2 + N2 → NH3

3.       Al2O3 → Al + O2

4.       KClO3 → KCl + O2

5.       S8 + O2 → SO2

6.       C2H6 + O2 → CO2 + H2O

7.       Al2(SO4)3 + Ca(OH)2 → Al(OH)3 + CaSO4

8.       P4 + O2 → P2O5

9.       Ag + S8 → Ag2S

10.       Al + Br2 → AlBr3

 

chemistry : Elements Compounds and Mixtures class 9

Elements Compounds and Mixtures

1.    Which of the following is an  element ,  a compound or  a mixture . Give reason for answer

a.     Chlorine     b. sulphur  c. sea water         d. CO2        e. bronze

2.    Define the following

a.     Molecule   b.      Atomicity   c.  Compound

3.    Name         a) A diatomic element b) Tetra atomic element  c)  Liquid metal                  d) mealleable metal     e) lustrous non metal  f) liquid non-metal

4.    Give difference between Mixture and Compound?

5.    What is the difference between homogeneous and heterogeneous mixture?

6.    Why air is considered a mixture

7.    What is a true solution?

8.    Give properties of suspension?

9.    Define electrophoresis?

10.                       How will you separate

a.     Sulphur and carbon

b.    Sand and sugar

c.     Iodine and common salt

d.    Naphthalene and common salt

e.     Iron fillings, iodine and sugar

11.                       On what factors does the separation of mixture depends

12.                       How will you separate two immiscible liquids?

13.                       What do you understand by chromatography?

14.                       What are metalloids? Give examples

15.                       Name three metals which show exceptions to the properties of metals