Advertisements
Advertisements
प्रश्न
Explain the term energy changes in a chemical change or reaction.
Advertisements
उत्तर
Energy changes in a chemical reaction:
“Is the difference between the chemical energy of the REACTANTS and the PRODUCTS”.
APPEARS IN
संबंधित प्रश्न
FILL IN THE BLANK
In a................ reaction heat energy is absorbed.
Identify the endothermic and exothermic reaction.
\[\ce{CaO + H2O -> Ca(OH)2 + Heat}\]
Complete the following statement.
On heating, hydrated copper sulphate changes its colour from ________ to __________.
State the following reaction whether heat is evolved or absorbed –
Two neutral gases combine to give a basic gas.
Complete the statement by filling in the blank with the correct word:
The element molybdenum used in the reaction of nitrogen with hydrogen at elevated temperatures is an example of a ________.
Select the correct answer from the options given below:
State the gaseous product formed, when
Two gases one of them neutral combines by absorption of light energy.
True or False. If false, give the correct answer.
Tarnishing of silver is an example of endothermic change.
Assertion: A drop of petrol when touched with finger gives a chill feeling.
Reason: The above phenomenon is an endothermic one.
Give scientific reason.
While preparing dilute sulphuric acid from concentrated sulphuric acid in the laboratory, the concentrated sulphuric acid is added slowly to water with constant stirring.
Give scientific reasons.
While preparing dilute sulphuric acid from concentrated sulphuric acid in the laboratory, the concentrated sulphuric acid is added slowly to water with constant stirring.
