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प्रश्न
Fill in the blank:
During a chemical reaction transfer of ________ takes place.
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उत्तर
During a chemical reaction transfer of energy takes place.
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संबंधित प्रश्न
FILL IN THE BLANK
In a ............ change, new substances are formed.
What are chemical reactions?
Fill in the blank
A new substance is formed in a _______ change.
Define chemical reaction.
State what you would observe when the following substance is heated in a glass test tube red lead.
Explain the following reaction with one suitable example of Decomposition reaction
Name the type of chemical reaction shown by the following equation:
CaCO3 → CaO + CO2
Name the type of chemical reaction shown by the following equation:
NaOH + HCl → NaCl + H2O
Write the chemical reaction where the following changes are observed.
Gas is evolved
Multiple choice:
Thermal decomposition of sodium carbonate will produce
Name: A greenish-yellow gas.
Name the following:
The type of change physical or chemical involved – ‘during respiration in human beings’.
On heating which of the following substances i.e. copper carbonate, zinc carbonate, washing soda, copper sulphate, zinc nitrate, copper nitrate, lead nitrate, ammonium chloride and ammonium dichromate – relate to the reaction given below.
A coloured substance which leaves on strong heating a black residue and evolves two colourless gases one of which is acidic and the other neutral.
Give a balanced equation for the conversion of an ammonium salt to a basic gas.
Which of the following is not an “element + element → compound” type reaction?
Match the following:
| 1. | Sodium Chloride | a. | CaSO41/2H2O |
| 2. | Calcium sulphate dihydrate | b. | C2H5Oh |
| 3. | Magnesium sulphate hydrate | c. | CaSO4.2H2O |
| 4. | Calcium sulphate hemihydrate | d. | NaCl |
| 5. | Phenol | e. | MgSO4.H2O |
Beating an egg to make a cake is a ______.
Write the chemical reaction of baking soda with lemon.
When milk is mixed with coffee decoction, the colour of milk and decoction changes due to ______.
