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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.
i want 20 physical changes and 20 chemical changes
WHY DO WHALES AND DOLPHINS KEEP COMING UP TO THE WATER SURFACE?
Breaking of glass is a physical change or chemical change ?
list some chemical compounds and their chemical formulas which we use in our daily life????
formation of clouds is a physical change explain
Describe two changes that are harmful. Explain why you consider them harmful .How can you prevent them ?
eruption of volcano is a chemical change.
is it true or false
write difference between physical and chemical change
why should we not put staniless steel spoon in pickle jars?
is crushing a can a reversible change or irreversible change
WHEN BAKING SODA IS MIXED WITH LEMON JUICE , BUBBLES ARE FORMED WITH THE EVOLUTION OF GAS . WHAT TYPE OF CHANGE IS IT? EXPLAIN
When a bulb is switched on, it gives out light and heat. Is it a chemical change or a physical change? Why?
c is the symbol of carbon.what else does it represent?
When a soda water bottle is opened, a gas is released. Does a chemical reaction occur?
AN IRON NAIL IS TAKEN TO THE MOON.ANOTHER IS KEPT NEAR THE GATEWAY OF INDIA ,MUMBAI,WHILE THE THIRD ONE IS KEPT NEAR RED FORT,DELHI.COMPARE THE DEGREE OF RUST FORMATION ON THE THREE NAILS.
valency of aluminium in Al2(SO4)3
why are physical changes are generally reversible?
What type of change is- growth of plants? (physical/chemical) Explain.
why falling of leaves from trees is a chemical change?
Balance the equation-
Fe + O2 + H2O ---->Fe2O3
Growing of a baby . Is physical or chemical change
Making of curd from milk is a physical change.How?
mixing sugar and lemon in water is what change and why
in which city do you expect rusting to be a greater problem-in delhi or in mumbai ?why?
misuse of science ? uses of science ? advantages and disadvantages of science
Burning of candle involves both physical and chemical changes. Explain.
valency of calcium in cacl2
explain crystallization
is breathing physical or chemical change ?
WHY ARE VENTILATORS MADE CLOSE TO CEILINGS?
the process of depositing a layer of zinc on iron is called ?
what is CuSO4+Fe=?
why are physical change and chemical change important ???????????
1.State true or false:
(a) Formation of clouds is a reversible change
2. Classify into chemical and physical change
(a) Transpiration
3. complete the following Equation:
(a) Quick lime (CaO) + Water (H2O) --->
(b) Sulphuric acid (H2SO4) + Zinc (Zn) ----> __________+ Hydrogen
__________ + H2
(c) Copper Sulphate (CuSO4) + Iron (Fe) ----->
(d) Cacium carbonate (CaCO3) _heat_>
(e) Carbon (C) + Sulphur (S) ---->
what is the chemical equation for baking soda+vinegar...
Balance the equation
(NH4)3PO4+Pb(NO3)4 gives Pb3(PO4)4 +NH4NO3
what is rusting?
Give one example of a chemical reaction showing change of state from Gas to Liquid
When baking soda is mixed with lemon juice, bubbles are formed with the evolution of a gas. What type of change is it? Explain.
Is boiling of rice a chemical change or physical ?
justify the statement that physical changes can be reversible as well as irreversible?
Reaction between Vinegar and lime juice makes carbon dioxide.How?
What is the atomicity of magnesium
value based question
ram and raheem are best friends . raheem goes to ram's house to celebrate Diwali. both are bursting crackers. suddenly, a spark falls on raheem's arm. ram immediately washes raheem's hand and applies a cream on hand.
1. do you think bursting of cracker is good for our environment?
2.which value is shown by ram here ?
why is rust formed on iron ?
Explain how painting of an iron gate prevents it from rusting.
Is the folding of paper a chemical change or a physical change?
difference between atom and molecule
What do you mean by distilled water?
Is galvanization a chemical or phisical change?
Breaking down of ozone is a physical or chemical change?Why ??? (EXPLAIN)
Curdling of milk is an irreversible change
LPG IS STORED IN A CYLINDER AS A LIQUID. WHEN YOU BURN IT IN THE STOVE , IT IS IN THE GASEOUS FORM. WHAT KIND OF CHANGES OCCUR DURING THE USE OF LPG?
Why is Stainless Steel preferred to make utensils?
What are physical changes? Give 5 examples.
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
very short note on rusting of iron
why is melting of ice to form water considered as physical change
melting of polar ice caps is physical change or chemical change
Destruction of ozone layer is physical change or chemical 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 !!!!!
how would justify rusting as 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.
i want 20 physical changes and 20 chemical changes
WHY DO WHALES AND DOLPHINS KEEP COMING UP TO THE WATER SURFACE?
Breaking of glass is a physical change or chemical change ?
list some chemical compounds and their chemical formulas which we use in our daily life????
formation of clouds is a physical change explain
Describe two changes that are harmful. Explain why you consider them harmful .How can you prevent them ?
eruption of volcano is a chemical change.
is it true or false
write difference between physical and chemical change
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
why should we not put staniless steel spoon in pickle jars?
is crushing a can a reversible change or irreversible change
WHEN BAKING SODA IS MIXED WITH LEMON JUICE , BUBBLES ARE FORMED WITH THE EVOLUTION OF GAS . WHAT TYPE OF CHANGE IS IT? EXPLAIN
When a bulb is switched on, it gives out light and heat. Is it a chemical change or a physical change? Why?
c is the symbol of carbon.what else does it represent?
When a soda water bottle is opened, a gas is released. Does a chemical reaction occur?
AN IRON NAIL IS TAKEN TO THE MOON.ANOTHER IS KEPT NEAR THE GATEWAY OF INDIA ,MUMBAI,WHILE THE THIRD ONE IS KEPT NEAR RED FORT,DELHI.COMPARE THE DEGREE OF RUST FORMATION ON THE THREE NAILS.
valency of aluminium in Al2(SO4)3
why are physical changes are generally reversible?
What type of change is- growth of plants? (physical/chemical) Explain.
why falling of leaves from trees is a chemical change?
Balance the equation-
rnFe + O2 + H2O ---->Fe2O3
Growing of a baby . Is physical or chemical change
Making of curd from milk is a physical change.How?
mixing sugar and lemon in water is what change and why
in which city do you expect rusting to be a greater problem-in delhi or in mumbai ?why?
misuse of science ? uses of science ? advantages and disadvantages of science
Burning of candle involves both physical and chemical changes. Explain.
valency of calcium in cacl2
explain crystallization
is breathing physical or chemical change ?
WHY ARE VENTILATORS MADE CLOSE TO CEILINGS?
1. Alloying prevents rusting .
2. Stretching a spring is a chemical change.
3. On mixing magnesium oxide with water and you substance called magnesium chloride is formed.
4. On mixing baking soda with vinegar, hydrogen gas is produced
the process of depositing a layer of zinc on iron is called ?
what is CuSO4+Fe=?
why are physical change and chemical change important ???????????
1.State true or false:
(a) Formation of clouds is a reversible change
2. Classify into chemical and physical change
(a) Transpiration
3. complete the following Equation:
(a) Quick lime (CaO) + Water (H2O) --->
(b) Sulphuric acid (H2SO4) + Zinc (Zn) ----> __________+ Hydrogen
__________ + H2
(c) Copper Sulphate (CuSO4) + Iron (Fe) ----->
(d) Cacium carbonate (CaCO3) _heat_>
(e) Carbon (C) + Sulphur (S) ---->
what is the chemical equation for baking soda+vinegar...
Balance the equation
(NH4)3PO4+Pb(NO3)4 gives Pb3(PO4)4 +NH4NO3
what is rusting?
Give one example of a chemical reaction showing change of state from Gas to Liquid
When baking soda is mixed with lemon juice, bubbles are formed with the evolution of a gas. What type of change is it? Explain.
Is boiling of rice a chemical change or physical ?
justify the statement that physical changes can be reversible as well as irreversible?
Reaction between Vinegar and lime juice makes carbon dioxide.How?
What is the atomicity of magnesium
value based question
ram and raheem are best friends . raheem goes to ram's house to celebrate Diwali. both are bursting crackers. suddenly, a spark falls on raheem's arm. ram immediately washes raheem's hand and applies a cream on hand.
1. do you think bursting of cracker is good for our environment?
2.which value is shown by ram here ?
why is rust formed on iron ?
2H2O=2H2+O2
Explain how painting of an iron gate prevents it from rusting.
Is the folding of paper a chemical change or a physical change?
difference between atom and molecule
Did you recover chalk from the dust?
Pls ansfast.Exams are on head!!!!
What do you mean by distilled water?
Is galvanization a chemical or phisical change?
Breaking down of ozone is a physical or chemical change?Why ??? (EXPLAIN)
Curdling of milk is an irreversible change
Tell me if it is a physical or chemical change ?
LPG IS STORED IN A CYLINDER AS A LIQUID. WHEN YOU BURN IT IN THE STOVE , IT IS IN THE GASEOUS FORM. WHAT KIND OF CHANGES OCCUR DURING THE USE OF LPG?
(A) Energy required by reactants is more than the energy used in the formation of products.
(B) Energy required by reactants is less than the energy used in the formation of products.
(C) Energy required by reactants is equal to the energy used in the formation of all products.
(D) All of the above.
Why is Stainless Steel preferred to make utensils?
What are physical changes? Give 5 examples.
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
very short note on rusting of iron
why is melting of ice to form water considered as physical change
melting of polar ice caps is physical change or chemical change
Destruction of ozone layer is physical change or chemical 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 !!!!!
1.Biogas is produced by decomposition of plant and animal waste by anaerobic bacteria
2. Biogas is burned as fuel
how would justify rusting as a chemical change?
how to balance Ca3(PO4)2 +H2SO4=CaSO4+Ca(H2PO4)3