Select Board & Class
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.
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.
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.
i want 20 physical changes and 20 chemical changes
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.
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????
Describe two changes that are harmful. Explain why you consider them harmful .How can you prevent them ?
Making of curd from milk is a physical change.How?
formation of clouds is a physical change explain
write difference between physical and chemical change
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
eruption of volcano is a chemical change.
is it true or false
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?
valency of aluminium in Al2(SO4)3
WHY DO WHALES AND DOLPHINS KEEP COMING UP TO THE WATER SURFACE?
What type of change is- growth of plants? (physical/chemical) Explain.
mixing sugar and lemon in water is what change and why
Balance the equation-
Fe + O2 + H2O ---->Fe2O3
why are physical changes are generally reversible?
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
why is melting of ice to form water considered as physical change
Burning of candle involves both physical and chemical changes. Explain.
why falling of leaves from trees is a 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=?
Growing of a baby . Is physical or chemical change
what is the chemical equation for baking soda+vinegar...
what are crystals?how can the crystals of sodium chloride be prepared from table salt?
Is galvanization a chemical or phisical change?
what is rusting?
explain crystiallization and how crystal of copper sulphate prepared?
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 ?
is breathing 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?
justify the statement that physical changes can be reversible as well as irreversible?
is crushing a can a reversible change or irreversible 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?
Curdling of milk is an irreversible change
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 ?
Breaking down of ozone is a physical or chemical change?Why ??? (EXPLAIN)
why are physical change and chemical change important ???????????
Reaction between Vinegar and lime juice makes carbon dioxide.How?
Why is Stainless Steel preferred to make utensils?
What are physical changes? Give 5 examples.
very short note on rusting of iron
melting of polar ice caps 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 !!!!!
In summers,if milk is not refrigerated,it becomes sour.Which of the following is added by milkmen to fresh milk to prevent the milk from spoiling?
A.Caustic soda B.Potash alum C.Baking soda D.Lime water
When a bulb is switched on, it gives out light and heat. Is it a chemical change or a physical change? Why?
a petrol can is left open. The vapour fills the garage. Is this a physical change
how would justify rusting as a chemical change?
how to balance Ca3(PO4)2 +H2SO4=CaSO4+Ca(H2PO4)3
Copyright © 2021 Aakash EduTech Pvt. Ltd. All rights reserved.
E.g: 9876543210, 01112345678
We will give you a call shortly, Thank You
Office hours: 9:00 am to 9:00 pm IST (7 days a week)