English

How Do the Following Help in Bringing About a Chemical Change? Light. - Chemistry

Advertisements
Advertisements

Question

How do the following help in bringing about a chemical change?

light.

One Line Answer

Solution

Some chemical reactions can take place in the presence of light. Ex. Photosynthesis.

\[\ce{6CO2 + 6H2O⇌[sunlight][Chlorophyll]\underset{\text{glucose}}{C6H12O6 +6O2}}\]

shaalaa.com
  Is there an error in this question or solution?
Chapter 6: Chemical Reactions - Exercise 1 [Page 73]

APPEARS IN

Selina Concise Chemistry [English] Class 8 ICSE
Chapter 6 Chemical Reactions
Exercise 1 | Q 3.2 | Page 73

RELATED QUESTIONS

State whether the following statement is true or false. In case a statement is false, write the corrected statement.

Iron pipes coated with zinc do not get rusted easily.


Complete and balance the following chemical equations

Na + H2 O →


Fill in the blank

 A catalyst either ................or ............... the rate of a chemical change but itself remains ............... at the end of the reaction.


Write the missing reactants and products and balance the equations.

NaOH + ............... `→` NaCI + ...................


FILL IN THE BLANK

........... electrolytes dissociate completely in aqueous state and allow large amount of electricity to flow through it.


How is a strong electrolyte different from a weak electrolyte?


Fill in the blank.

Melting of ice is a _______ change.


Name the type of chemical reaction shown by the following equation:

2Mg + O2 → 2MgO


Complete the statement by filling the gaps using appropriate term from the terms given in the bracket.

(slow, coloured, arrow, fast, smell, milky, physical, product, chemical, reactant, covalent, ionic, octet, duplet, exchange, sharing, equality sign)

A colourless solution of calcium hydroxide in a test tube turns ______ on blowing in it through a blow tube for some time.


Explain by writing a word equation.

Hard water gets softened on mixing with a solution of washing soda.


Show with the help of diagram of electronic configuration how the following compound is formed from the constituent atoms.

Sodium chloride


Give an example of a reaction where the following are involved

Heat


Write the chemical reaction where the following changes are observed.

Colour change is noticed


What do you understand by 'chemical reaction'?


What do you observe? When

Barium chloride is added to sodium sulphate solution


Name: A brown gas 


What is observed in performing the following :

  Hydrogen Oxygen Carbon dioxide Chlorine
Litmus test        
Apply a burning splint to the gas        
Colour of gas colourless colourless colourless greenish-yellow
Odour of gas        

What do you observe when dilute sulphuric acid is added to the following:

Sodium Sulphide


Distinguish by dilute sulphuric acid.

Sodium sulphide and sodium sulphite?


Name the following:

The type of change physical or chemical involved – ‘during respiration in human beings’.


Explain with the help of balanced equations, how precipitation reactions are used for identifying the positive radicals in three different salts, each having a different cation [positive ion].


_____ is the basic material to manufacture urea.


Silver metal can displace hydrogen gas from nitric acid.


Chemical change is a temporary change.


Water boiling into water vapour is an example of chemical change.


Write some materials prepared by chemical changes.


Which of the following statement is incorrect for a chemical reaction?


Vanaspati is obtained from vegetable oils by the addition of ______ to the oils.


How can we prevent rusting?


Assertion (A): Cutting paper into very small pieces is an irreversible change.
Reason (R): Physical changes are always reversible.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×