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प्रश्न
Fill in the blank
A new substance is formed in a _______ change.
उत्तर
A new substance is formed in a chemical change.
APPEARS IN
संबंधित प्रश्न
Complete and balance the following chemical equations:
Ba`"CI"_2` + `"H"_2"SO"_4` `→`
(aq.) (aq.)
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Which one of the following alters the rate of the chemical reaction without itself undergoing any change?
- temperature and Pressure
- concentration of reactants
- presence of catalyst
- none of these
What are biocatalysts ?
Is kerosene an electrolyte or a non-electrolyte ?
Balance the following equation :
Fe + H2O → Fe3O4 + H2
Name the type of chemical reaction shown by the following equation :
Fe2O3 + 2Al → Al2O3 + 2Fe
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)
An ______ is drawn in between the reactants and products while writing the equation for a chemical reaction.
Choose the correct option from the bracket and explain the statement giving a reason.
(Oxidation, displacement, electrolysis, reduction, zinc, copper, double displacement, decomposition)
Addition of an aqueous solution of ZnSO4 to an aqueous solution of BaCl2 is an example of ______ reaction.
Give an example of a reaction where the following are involved
Electricity
Give an example of a reaction where the following are involved
Catalyst
Give an example of the following chemical change.
Two gases combine to form white solid
Explain,giving one example of the following chemical changes:
Reversible reaction
Multiple choice:
Thermal decomposition of sodium carbonate will produce
Define:
Photochemical reaction
Give one example
Complete and balance the following reaction:
\[\ce{CuCO3 ->[\Delta]}\]
Complete the following table and write your observations.
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Hydrogen sulphide |
Ammonia |
Sulphur dioxide |
Hydrogen chloride |
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Shake the gas with red litmus solution |
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Shake the gas with blue litmus solution |
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Apply a burning splint to a gas |
Give a chemical test to distinguish between the following gases.
HCl and H2S
Give a chemical test to distinguish between the following gases.
NH3 and SO2
Distinguish by dilute sulphuric acid.
Copper and magnesium?
Select the correct answer for the following options:
The gas which reacts with oxygen to give a neutral liquid.
Name the following:
The products obtained during ‘photosynthesis’ – which is a chemical change.
What is a chemical reaction?
Give balanced equation for the following conversion affected by heat alone on the substance:
Zinc nitrate to nitrogen dioxide
Give two examples where a chemical reaction is accompanied by a change in colour of the reactants and products on completion of the reaction.
Assertion: The formation of iron oxide from iron is a chemical change.
Reason: For the rust to form from iron, it must be exposed to air and water.
State whether the following statements are true or false:
When a candle burns, both physical and chemical changes take place.
The chemical formula of rust is ______.
How would you show that the settling of curd is a chemical change?
Both CO2 and H2 gases are ______.
Write the effects of chemical reactions.
