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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
formation of clouds is a physical change explain
Breaking of glass is a physical change or chemical change ?
Give one example of a chemical reaction showing change of state from Gas to Liquid
list some chemical compounds and their chemical formulas which we use in our daily life????
Describe two changes that are harmful. Explain why you consider them harmful .How can you prevent them ?
Balance the equation
(NH4)3PO4+Pb(NO3)4 gives Pb3(PO4)4 +NH4NO3
write difference between physical and chemical change
WHY DO WHALES AND DOLPHINS KEEP COMING UP TO THE WATER SURFACE?
why should we not put staniless steel spoon in pickle jars?
When a bulb is switched on, it gives out light and heat. Is it a chemical change or a physical change? Why?
WHEN BAKING SODA IS MIXED WITH LEMON JUICE , BUBBLES ARE FORMED WITH THE EVOLUTION OF GAS . WHAT TYPE OF CHANGE IS IT? EXPLAIN
Making of curd from milk is a physical change.How?
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
What type of change is- growth of plants? (physical/chemical) Explain.
why are physical change and chemical change important ???????????
Balance the equation-
Fe + O2 + H2O ---->Fe2O3
1.State true or false:
(a) Formation of clouds is a reversible change
2. Classify into chemical and physical change
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) ---->
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
is breathing physical or chemical change ?
Burning of candle involves both physical and chemical changes. Explain.
WHY ARE VENTILATORS MADE CLOSE TO CEILINGS?
what is the reaction between
vinegar and baking soda?
the process of depositing a layer of zinc on iron is called ?
Growing of a baby . Is physical or chemical change
what is CuSO4+Fe=?
what is the chemical equation for baking soda+vinegar...
what is rusting?
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 ?
what are crystals?how can the crystals of sodium chloride be prepared from table salt?
justify the statement that physical changes can be reversible as well as irreversible?
why is melting of ice to form water considered as physical change
What is the atomicity of magnesium
Is the folding of paper a chemical change or a physical change?
why is rust formed on iron ?
2Mg + O2= 2MgO
Why it is written 2Mg not Mg2
Explain how painting of an iron gate prevents it from rusting.
difference between atom and molecule
valency of calcium in cacl2
What do you mean by distilled water?
Breaking down of ozone is a physical or chemical change?Why ??? (EXPLAIN)
Is galvanization a chemical or phisical change?
Curdling of milk is an irreversible change
mixing sugar and lemon in water is what change and why
why falling of leaves from trees is a chemical change?
Why is Stainless Steel preferred to make utensils?
What are physical changes? Give 5 examples.
very short note on rusting of iron
Is Magnesium oxide is a reversible change??
melting of polar ice caps is physical change or chemical change
explain crystiallization and how crystal of copper sulphate prepared?
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 !!!!!
Reaction between Vinegar and lime juice makes carbon dioxide.How?
how would justify rusting as a chemical change?
how to balance Ca3(PO4)2 +H2SO4=CaSO4+Ca(H2PO4)3
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.
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