Advertisements
Advertisements
प्रश्न
Write true or false :
No new substance is formed during a chemical reaction.
पर्याय
True
False
Advertisements
उत्तर
False
APPEARS IN
संबंधित प्रश्न
Changes in which new substances are formed are called ______ changes.
How do the following help in bringing about a chemical change?
heat.
Define chemical reaction.
State four conditions necessary for a chemical reaction to take place.
Balance the following equation :
Fe + H2O → Fe3O4 + H2
State what you would observe when the following substance is heated in a glass test tube red lead.
Show with the help of diagram of electronic configuration how the following compound is formed from the constituent atoms.
Potassium fluoride
State the original colour of the following substance and colour of residue obtained after heating.
Zinc carbonate
Distinguish by heating the following in dry test tubs.
Copper Sulphate and copper carbonate
State the following reaction represent oxidation or reduction.
\[\ce{Cl- ->Cl}\]
A chemical reaction is often accompanied by external indications or characteristics.
NPK are the primary nutrients for plants.
The water we drink is a combination of hydrogen and oxygen.
Write some materials prepared by chemical changes.
Melting of wax is a change where a solid changes to liquid state. Give one more such change which you observe in your surroundings
Iron benches kept in lawns and gardens get____________. It is a _________ change because a new _________ is formed.
A student took a solution of copper sulphate in a beaker and put a clean iron nail into it and left it for about an hour.
Are these changes chemical in nature?
Give an example where heat, light, and sound are produced during a chemical change.
What is the difference between reactants and products?
Collect information about the types of fuels used for cooking in your area. Discuss with your teachers/parents/others which fuels are less polluting and why.
