Advertisements
Advertisements
Question
True or false
New substances are formed in a chemical change.
Options
True
False
Advertisements
Solution
True
APPEARS IN
RELATED QUESTIONS
FILL IN THE BLANK
Positively charged ions are called ........
Define electrolysis.
Define chemical reaction.
Fill in the blank:
In some chemical reactions an insoluble ________ is formed when two solutions are mixed.
Write true or false :
When iron and sulphur are heated together a grey mass is formed which is attracted by a magnet .
State what you would observe when the following substance is heated in a glass test tube Copper (II) carbonate Red lead .
Give reason for the following:
Silver nitrate solution is kept in coloured bottles.
Explain,giving one example of the following chemical changes:
Reversible reaction
Complete and balance the following reaction:
\[\ce{NH3 + O2 ->[\Delta]}\]
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.
Select the correct answer from the options given below:
State the gaseous product formed, when
An ammonium salt reacts with an alkali.
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Lead nitrate.
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.
Rusting of Iron: undesirable change:: Dead plants turn into manure: ______.
Silver articles turning black: ______:: Boiling of H2O: physical change ______.
Which of the following is a chemical change?
If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.
Can you change rust back into iron by some simple method?
Rusting of iron is ______.
Is the conversion of milk into ice cream a chemical change?
