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प्रश्न
A chemical equation is a statement that describes a chemical change in terms of
विकल्प
symbols and formulae
energy
number of atoms
colours
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उत्तर
symbols and formulae.
APPEARS IN
संबंधित प्रश्न
Changes in which new substances are formed are called ______ changes.
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Reduction is a chemical reaction in which there is
- removal of hydrogen
- removal of oxygen
- addition of oxygen
- none of these
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Miscible liquids having slightly different boiling points can be separated by the
- evaporation
- distillation
- fractional distillation
- sedimentation
How is precipitate formation in a chemical reaction indicated?
Fill in the blank:
During a chemical reaction transfer of ________ takes place.
Write true or false :
No new substance is formed during a chemical reaction.
Copper carbonate when heated, it turns :
Write balanced chemical equations for the reactions represented by word equations in the conditions for chemical reaction.
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)
The spoiling of food is a chemical change which is recognized from the generation of certain ______ due to it.
Give an example of a reaction where the following are involved:
Solution
Give reason for the following:
Blue solution of copper sulphate changes to green when a piece of iron is added to this solution.
Write your observation and a balanced equation in the case of the following substances being heated.
Copper carbonate.
Select the correct answer for the following options:
The black residue obtained on heating copper carbonate.
What is a chemical reaction?
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 white solid which evolves two colourless gases which on cooling combine and condense on the cooler parts of the test tube.
Complete the table given below.
| Flame test for calcium chloride | Acid used for flame test |
Give a balanced equation for a reaction involving the evolution of gas on the addition of dilute acid to calcium carbonate.
The percentage composition of Nitrogen in Ureas is ______.
______ are substances that speed up the process of a chemical change and it will not undergo any change during the course of the reaction.
Why is spoiling food a chemical change?
