Advertisements
Advertisements
Question
If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.
Do you think formation of rust from iron is a chemical change?
Advertisements
Solution
Yes, rusting is a chemical change since a new substance is formed.
APPEARS IN
RELATED QUESTIONS
Write the missing reactants and products and balance the equations.
\[\ce{KClO3 ->[heat]}\] ___________+ ____________
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Compounds, which in their molten state allow an electric current to pass through them are called
- electrolytes
- non-electrolytes
- non-conductors
- none of these
Define electrolysis.
Is kerosene an electrolyte or a non-electrolyte ?
Write true or false :
No new substance is formed during a chemical reaction.
Name: A brown gas
Give a balanced equation for a reaction involving the evolution of gas on the addition of dilute acid to calcium carbonate.
Silver metal can displace hydrogen gas from nitric acid.
Analogy:
H2O: Water:: NaCl: ______.
When magnesium is burnt in the air, a new substance is formed which is ______.
