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rusting of iron is a irreversible change. but can't we get the iron back by electroplating
what is man-made change?Give example
what is physical change
Give Reason For the following:
Q1) Mixing of sand with water is a reversible change.
Q2) Mixing of cement with water is an irreversible change.
Q3) Burning of sugar is a chemical change.
Classify the following changes as physical or chemical changes
Evaporation of alcohol
Expansion of air
Dissolving salt in water
Cooling a mixture of air and kerosene vapour
Burning a mixture of air and kerosene vapour
Pulling copper into thin wire
Tarnishing of jewellery
what are desirable and non desirable changes?
water added to sand and salt is a physical change whereasit added to cement is a chemical change.justify
difference between desirable and undesirable
why do only iron attracts magnet
what does detrimental mean?
in a lamp having wick and oil what causes to continue to burn when it is lighted up?
what is the meaning of the sentence below
Cow dung to biogas
A little amount of copper sulphate is heated in a test tube.
a.what happens to the colour of copper sulphate in this reaction?why?
b.name the other substance during this reaction.
c.what type of change is it?
blackening of silver ware - what kind of change is this?
WHAT IS A CHEMICAL CHANGE?GIVE 2 EXAMPLES.
Will bad conductors of heat expand faster than good conductors of heat ? or vice - versa? why so?
Burning of candle is a physical or chemical change?
what is the meaning of the below extract
is the 'electrolysis of water '-a physical or a chemical change?
IS THERE ANY SUBSTANCE WHICH IS A CHEMICAL CHAGE AND A PHYSICAL CHANGE?
can a burning a metal?????????????
Describe an experiment to explain the difference between melting and burning.
all the physical changes are temporary and reversable but are all temporary and reversable changes, physical changes?
What is the main difference between chemical change and physical change?
can melting of wax be a physical change?
How can we lught fire in water?
what are negative and positive radicals?
potssium nitrate in aqueous solution chemical change or physical change
what is phycial change i can't understand??????
Is respiration in body an exothermic change or an endothermic change ?
If rusting of iron is a chemical change then when it gets rusted so why doesnot it forms a new substance?
the burning of coal and rusting of iron are chemical change how are they diferrent from each other
What is Periodic changes?
Which alphabet will come in place of '?'
? T T F FS S E N T
E T T F FS S E N T
NOT 'E' AT ALL AND NOT SO EASY!!!!
what is chemical change?
the process rusting is a fast change or slow change
Is it true that that watermelon is white on the inside but turns red when it gets exposed to air as it's cut?
What is a periodic change ? Can you please explain with some examples ?
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