Question

Name two components of central nervous system in Humans.

Q.2 Name the device that helps to maintain a potential difference across a conductor.

Q.3 State one use of glass cover in box type solar cookers.

Q.4 Write the chemical formula of Bleaching powder. How is bleaching powder prepared?

For what purpose is it used in drinking water?

Q.5 On heating copper powder in air the surface of copper powder becomes coated with

black CuO. How can this black coating be converted into brown copper? Write chemical

equation for the reaction that occurs during the colour change.

Q.6 (i) Write the balanced chemical equation for the process of photosynthesis ......
please answer all these

Answer 1

HEY YASHVI! HERE IS YOUR ANSWER

1. Two components of central nervous system are
brain and spinal cord

2.voltmeter...

3.Black colour absorbs maximum energy from the Sun's radiation, that is why we use black colour glasses cover in box type solar cookers ...

4.Bleaching powder CaOCl2
The chemical name for Bleaching powder is Calcium Oxycloride.

Bleaching powder is prepared by passing gas state of chlorine over dry slaked lime

Ca(OH)2 +Cl2=CaOCl2 + H2O
Bleaching powder is used for disinfecting drinking water .....

5.copper can be obtained from copper oxide by passing or adding carbon

Reaction:  2CuO + C ---> 2Cu +  CO2

6.Green plants uses CO2 in presence of light for the photosynthesis process to prepare carbohydrates. This is an endothermic reaction.
Reaction given as follows
6CO2 (g) + 6H2O (l) → C6H12O6 (S) + 6O2 (g)

HOPE IT HELPS :)

Answer 2

1.The CNS contains the brain and spinal cord.

2.A battery consisting of one or more electric cells is used to maintain a potential difference across a conductor.

3.The glass cover enables the cooker to entrap the heat inside it.

4.The chemical name of bleaching powder is calcium oxychloride and its chemical formula is CaOCl2 . It is prepared by passing chlorine gas through dry slaked lime.

5.Heated copper metal reacts with oxygen to form the black copper oxide. The copper oxide can then react with the hydrogen gas to form the copper metal and water.