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What happens when Magnesium ribbon is burnt in air?If the product obtained is mexed with water,then what is the nature os that aqueous solution.
Breaking of glass is a physical change or chemical change ?
i want 20 physical changes and 20 chemical changes
list some chemical compounds and their chemical formulas which we use in our daily life????
why is melting of ice to form water considered as physical change
Describe two changes that are harmful. Explain why you consider them harmful .How can you prevent them ?
formation of clouds is a physical change explain
write difference between physical and chemical change
When a bulb is switched on, it gives out light and heat. Is it a chemical change or a physical change? Why?
why should we not put staniless steel spoon in pickle jars?
WHEN BAKING SODA IS MIXED WITH LEMON JUICE , BUBBLES ARE FORMED WITH THE EVOLUTION OF GAS . WHAT TYPE OF CHANGE IS IT? EXPLAIN
c is the symbol of carbon.what else does it represent?
eruption of volcano is a chemical change.
is it true or false
When a soda water bottle is opened, a gas is released. Does a chemical reaction occur?
valency of aluminium in Al2(SO4)3
Breaking down of ozone is a physical or chemical change?Why ??? (EXPLAIN)
What type of change is- growth of plants? (physical/chemical) Explain.
explain crystiallization and how crystal of copper sulphate prepared?
Balance the equation-
Fe + O2 + H2O ---->Fe2O3
Is the folding of paper a chemical change or a physical change?
Making of curd from milk is a physical change.How?
Give one example of a chemical reaction showing change of state from Gas to Liquid
in which city do you expect rusting to be a greater problem-in delhi or in mumbai ?why?
Balance the equation
(NH4)3PO4+Pb(NO3)4 gives Pb3(PO4)4 +NH4NO3
misuse of science ? uses of science ? advantages and disadvantages of science
Burning of candle involves both physical and chemical changes. Explain.
WHY DO WHALES AND DOLPHINS KEEP COMING UP TO THE WATER SURFACE?
explain crystallization
why are physical changes are generally reversible?
WHY ARE VENTILATORS MADE CLOSE TO CEILINGS?
why are physical change and chemical change important ???????????
the process of depositing a layer of zinc on iron is called ?
Iron (Fe) + Oxygen (O2) + Water (H2O) → Rust (Fe2O3)
Q1 WHY THE FE GOT FE2 AND O3 WHICH WAS O2 HOW IT BECAME O3
Q2. I AM NOT SURE BUT IN MY SCHOOL BOOK THE FORMULA OF RUSHTING IS
FE2 O3 . XH20
what is CuSO4+Fe=?
Growing of a baby . Is physical or chemical change
what are crystals?how can the crystals of sodium chloride be prepared from table salt?
what is the chemical equation for baking soda+vinegar...
Is galvanization a chemical or phisical change?
what is rusting?
When baking soda is mixed with lemon juice, bubbles are formed with the evolution of a gas. What type of change is it? Explain.
mixing sugar and lemon in water is what change and why
Is boiling of rice a chemical change or physical ?
is breathing physical or chemical change ?
justify the statement that physical changes can be reversible as well as irreversible?
Destruction of ozone layer is physical change or chemical change??
What is the atomicity of magnesium
why is rust formed on iron ?
Explain how painting of an iron gate prevents it from rusting.
difference between atom and molecule
What do you mean by distilled water?
why falling of leaves from trees is a chemical change?
We see
2Mg + O2= 2MgO
Why it is written 2Mg not Mg2
Curdling of milk is an irreversible change
why does 2Co2 mean two molecules of carbon dioxide whereas 2He stands for two atoms of helium?
Reaction between Vinegar and lime juice makes carbon dioxide.How?
describe tinning of iron sheets
Why is Stainless Steel preferred to make utensils?
the change of a flower into a fruit is a chemical or a physical change? explain why.....
What are physical changes? Give 5 examples.
valency of calcium in cacl2
very short note on rusting of iron
if the certain compound has a formula H2X, what is valency of X?
melting of polar ice caps is physical change or chemical change
is crushing a can a reversible change or irreversible change
Why do ships suffer a lot of damage from rusting in spite of being painted ? Experts plz send the quick as possible becoz I have science exam tommorow plz quick !!!!!
CLASSIFY THE FOLLOWING AS PHYSICAL OR CHEMICAL CHANGES .also justify it. :
a.eating a vada.
b.frying an egg.
c.a petrol can is left open in the garage.the vapour fills the garage.
d.melting wax.
e.melted wax turns into vapour and then burns.
f.rani applied henna to her palms.
g.raghav poured milk in his cornflakes.
h.raja finds his cake of soap getting smaller each week.
i.sam burnt the toaster.
j.the milk turned sour.
k.mrs.iyer cooked rice and made a tasty pudding.
l.carbon dioxide is cooled until it turns into solid "dry ice"which is used for refrigetion.
what is a change involved in blooming of a flower
how would justify rusting as a chemical change?
how is leaf falling from a tree is a chemical change ?
how to balance Ca3(PO4)2 +H2SO4=CaSO4+Ca(H2PO4)3
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Syllabus
What happens when Magnesium ribbon is burnt in air?If the product obtained is mexed with water,then what is the nature os that aqueous solution.
Breaking of glass is a physical change or chemical change ?
i want 20 physical changes and 20 chemical changes
a. X + Y - XY
b. + XY - X + Y
c. AB + XY - AY + XB
d. AB + X - AX + B
e. AB + CD - AD + BC
f. Acid + base - salt + water
list some chemical compounds and their chemical formulas which we use in our daily life????
why is melting of ice to form water considered as physical change
Describe two changes that are harmful. Explain why you consider them harmful .How can you prevent them ?
list 2 physical changes and 3 chemical changes during diwali festival.
formation of clouds is a physical change explain
write difference between physical and chemical change
When a bulb is switched on, it gives out light and heat. Is it a chemical change or a physical change? Why?
why should we not put staniless steel spoon in pickle jars?
WHEN BAKING SODA IS MIXED WITH LEMON JUICE , BUBBLES ARE FORMED WITH THE EVOLUTION OF GAS . WHAT TYPE OF CHANGE IS IT? EXPLAIN
c is the symbol of carbon.what else does it represent?
eruption of volcano is a chemical change.
is it true or false
When a soda water bottle is opened, a gas is released. Does a chemical reaction occur?
valency of aluminium in Al2(SO4)3
Breaking down of ozone is a physical or chemical change?Why ??? (EXPLAIN)
What type of change is- growth of plants? (physical/chemical) Explain.
explain crystiallization and how crystal of copper sulphate prepared?
Balance the equation-
rnFe + O2 + H2O ---->Fe2O3
Is the folding of paper a chemical change or a physical change?
Making of curd from milk is a physical change.How?
Give one example of a chemical reaction showing change of state from Gas to Liquid
in which city do you expect rusting to be a greater problem-in delhi or in mumbai ?why?
Balance the equation
(NH4)3PO4+Pb(NO3)4 gives Pb3(PO4)4 +NH4NO3
misuse of science ? uses of science ? advantages and disadvantages of science
Burning of candle involves both physical and chemical changes. Explain.
WHY DO WHALES AND DOLPHINS KEEP COMING UP TO THE WATER SURFACE?
explain crystallization
why are physical changes are generally reversible?
WHY ARE VENTILATORS MADE CLOSE TO CEILINGS?
why are physical change and chemical change important ???????????
the process of depositing a layer of zinc on iron is called ?
Iron (Fe) + Oxygen (O2) + Water (H2O) → Rust (Fe2O3)
Q1 WHY THE FE GOT FE2 AND O3 WHICH WAS O2 HOW IT BECAME O3
Q2. I AM NOT SURE BUT IN MY SCHOOL BOOK THE FORMULA OF RUSHTING IS
FE2 O3 . XH20
what is CuSO4+Fe=?
Growing of a baby . Is physical or chemical change
what are crystals?how can the crystals of sodium chloride be prepared from table salt?
what is the chemical equation for baking soda+vinegar...
Is galvanization a chemical or phisical change?
A. Clayey
B. Sandy
C. Loamy
D. None of these
what is rusting?
When baking soda is mixed with lemon juice, bubbles are formed with the evolution of a gas. What type of change is it? Explain.
mixing sugar and lemon in water is what change and why
Is boiling of rice a chemical change or physical ?
is breathing physical or chemical change ?
justify the statement that physical changes can be reversible as well as irreversible?
Destruction of ozone layer is physical change or chemical change??
What is the atomicity of magnesium
why is rust formed on iron ?
Explain how painting of an iron gate prevents it from rusting.
difference between atom and molecule
What do you mean by distilled water?
why falling of leaves from trees is a chemical change?
We see
2Mg + O2= 2MgO
Why it is written 2Mg not Mg2
Curdling of milk is an irreversible change
why does 2Co2 mean two molecules of carbon dioxide whereas 2He stands for two atoms of helium?
Reaction between Vinegar and lime juice makes carbon dioxide.How?
describe tinning of iron sheets
Why is Stainless Steel preferred to make utensils?
the change of a flower into a fruit is a chemical or a physical change? explain why.....
What are physical changes? Give 5 examples.
valency of calcium in cacl2
very short note on rusting of iron
if the certain compound has a formula H2X, what is valency of X?
melting of polar ice caps is physical change or chemical change
is crushing a can a reversible change or irreversible change
Why do ships suffer a lot of damage from rusting in spite of being painted ? Experts plz send the quick as possible becoz I have science exam tommorow plz quick !!!!!
2A + B = 2C
What kind of change would this represent?
CLASSIFY THE FOLLOWING AS PHYSICAL OR CHEMICAL CHANGES .also justify it. :
a.eating a vada.
b.frying an egg.
c.a petrol can is left open in the garage.the vapour fills the garage.
d.melting wax.
e.melted wax turns into vapour and then burns.
f.rani applied henna to her palms.
g.raghav poured milk in his cornflakes.
h.raja finds his cake of soap getting smaller each week.
i.sam burnt the toaster.
j.the milk turned sour.
k.mrs.iyer cooked rice and made a tasty pudding.
l.carbon dioxide is cooled until it turns into solid "dry ice"which is used for refrigetion.
what is a change involved in blooming of a flower
how would justify rusting as a chemical change?
how is leaf falling from a tree is a chemical change ?
how to balance Ca3(PO4)2 +H2SO4=CaSO4+Ca(H2PO4)3