CBSE IX Chemistry Is Matter Around Us Pure?
is tea a chemical change?
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7th March 2008
3:04 PM
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ICSE X Physics Work, Energy and Power
difference between chemical and nuclear change
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4th November 2014
6:30 PM
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CBSE VII Science Physical and Chemical Changes
using lpg in a gas stove for cooking involve both chemical and physical change
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12th November 2017
8:29 PM
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CBSE VII Science Physical and Chemical Changes
preparing crystals of cooper sulphate from copper and sulphuric acid involves both physical and chemical changes
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12th November 2017
8:32 PM
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CBSE VII Science Physical and Chemical Changes
why do cut vegetables take up a brown colouration when exposed to air
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12th November 2017
8:48 PM
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CBSE VII Science Physical and Chemical Changes
Preparing crystals of coppersulphate from copper and sulphuric acid involves both physical and chemical changes.why? that is the one asked in my assesment?
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16th November 2017
8:13 AM
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ICSE VII Chemistry Physical and Chemical Changes
what is the chemical name and formulae of charring of sugar
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6th March 2018
3:31 PM
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ICSE VIII Chemistry Physical and Chemical Changes
why is boiling of eggs a chemical change while the boiling of water is a physical change?
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23rd March 2018
10:41 AM
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ICSE VIII Chemistry Physical and Chemical Changes
define burning . what type of change is it?
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23rd March 2018
10:48 AM
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ICSE VIII Chemistry Physical and Chemical Changes
are the following natural changes ? justify answer a)photosynthesis b)cooking food
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23rd March 2018
11:45 AM
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ICSE VIII Chemistry Matter
long answer question explain the main features of a chemical change with example
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23rd March 2018
11:46 AM
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ICSE VIII Chemistry Physical and Chemical Changes
give reason for the following melting of wax is a physical change but burning of a candle is a chemical change.
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23rd March 2018
12:26 PM
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ICSE VIII Chemistry Physical and Chemical Changes
Is melting of the candle a chemical change?How?
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7th April 2018
9:30 PM
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ICSE VIII Physics Energy
state the energy changes 1)a washing machine 2)a solar cell 3)a battery
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11th April 2018
5:11 PM
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ICSE VIII Chemistry Hydrogen
how is the formation of water by combining hydogen and oxygen a chemical change.I think it is a physical change because water can be changed to hydrogen and oxygen by the analysis.
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23rd June 2018
5:25 PM
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ICSE VIII Chemistry Physical and Chemical Changes
Which of the following is a chemical property? a.density b.solubility c.reaction with acid d.colour
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21st September 2018
3:40 PM
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CBSE VII Science Physical and Chemical Changes
Define physical and chemical changes. Can they be reversed? Explain.
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21st September 2018
5:00 PM
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CBSE VI Science Changes Around Us
which type of change?making pizza base from dough.
Asked by Www.harshit
25th October 2018
4:01 PM
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CBSE VII Science Physical and Chemical Changes
Most chemical changes are ______________________________, but some chemical changes can be reversed by ________
Asked by Nimmi
9th November 2018
3:12 PM
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CBSE VII Science Physical and Chemical Changes
How would you prove that breaking down of ozone layer and the process of photosynthesis are Chemical changes
Asked by Nimmi
9th November 2018
3:32 PM
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ICSE VIII Chemistry Physical and Chemical Changes
is electrolysis a chemicalchange
Asked by arajeevshashank
18th November 2018
5:03 PM
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CBSE VI Science Changes Around Us
How are the following changes Different from each other? a. Changing of milk b. Hot milk becoming cold milk
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29th December 2018
9:43 PM
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CBSE VI Science Changes Around Us
When a candle is lighted,following observations are made: 1)the candle burns 2)size of the candle reduces 3)wax melts 4)melted eax solidifies Which of the above changes arw reversible?
Asked by Z3hdamalik
3rd January 2019
10:12 PM
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ICSE X Chemistry Metal - Non Metal
Why does Pb(NO3)2 not respond to brown ring test?
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31st January 2019
12:22 PM
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ICSE IX Chemistry Chemical Changes and Reactions
What do you observe when Lead Nitrate crystals are strongly heated Name the gas evolved when nitrogen combines with hydrogen Write a balanced chemical equation for addition of zinc to sodium hydroxide solution Name the industrial method for preparation of hydrogen gas and name the catalyst used in above process Distinguish between the following pairs of substances on the basis of chemical tests given in the brackets. : sodium chloride and potassium. chloride(flame test) : zinc carbonate and lead carbonate(dry heatingg 6. Calculate the volume of gas X at STP if it occupies 380 litres. at 300 Kelvin and 70 cm of. Mercury 7. A gas occupies 17 at 27 degree Celsius what volume will it occupy at 273 degree Celsius pressure remaining constant. 8. Calculate the relative molecular mass of each of the following (1.) ammonium dichromate (2.) hydrated copper sulphate 9. Calculate the percentage of Nitrogen in Ammonium Nitrate
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3rd February 2019
9:05 AM
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ICSE VIII Chemistry Physical and Chemical Changes
Respiration in a chemical change
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7th March 2019
10:33 PM
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CBSE VII Science Physical and Chemical Changes
Why should more than one clue be used to determine if a substance has gone through a chemical change?
Asked by Nimmi
10th March 2019
12:13 AM
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CBSE VII Science Physical and Chemical Changes
substance before a chemical change are -----------------------------------------------. After a chemcial change the new substances formed are ------------------------------------
Asked by Nimmi
10th March 2019
12:15 AM
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CBSE VII Science
Difference between chemcial change and chemical property
Asked by Nimmi
10th March 2019
12:20 AM
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CBSE VII Science Physical and Chemical Changes
whether the change is physical or chemical, the ------------------------------------------------------------------- eventhough-------------------------------------------------------------------
Asked by Nimmi
10th March 2019
12:38 AM
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CBSE X Chemistry Physical and Chemical Changes
Explain the different types of energy needed for different kinds of chemical changes?
Asked by Parveen.bisht86
3rd May 2019
5:16 PM
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ICSE VII Chemistry Physical and Chemical Changes
Pulling of rubber strings a reversible change explain
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21st May 2019
9:30 PM
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ICSE VIII Chemistry Physical and Chemical Changes
Into how many types can you classify the change -germination of seeds
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19th June 2019
8:19 AM
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ICSE VII Chemistry Physical and Chemical Changes
is falling of leaves from a tree of irreversible change?give reason.
Asked by roopalmbd60
30th June 2019
10:52 AM
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CBSE X Chemistry Chemical Reactions and Equations
What happen when nitric acid is added to egg shells
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4th January 2020
10:22 PM
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CBSE X Chemistry Chemical Reactions and Equations
Which out of burning of wax and melting of wax is a chemical change ? Give reason
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4th January 2020
10:43 PM
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CBSE X Chemistry Metals and Non Metals
what happens when sulphur oxide is mixed with water?
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1st February 2020
8:36 AM
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CBSE XI Science Chemistry Chemical Reactions and Equations
Can we write Fe2O3 + Al ------ Al2O3 + Fe for this question?
Asked by subbukum
3rd March 2020
7:36 AM
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CBSE VII Science Physical and Chemical Changes
physical change and chemical change
Asked by rashmipujari87
28th March 2020
6:13 PM
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CBSE X Chemistry Chemical Reactions and Equations
burning of wax undergo in which reaction and why
Asked by surendrakumarberiha1252
30th March 2020
7:59 AM
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ICSE IX Chemistry Chemical Changes and Reactions
WHAT IS THE MEANING OF CHEMICAL REACTION ?
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26th April 2020
10:39 AM
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ICSE IX Chemistry Chemical Changes and Reactions
Please tell us about the new method of balancing equation the new skeleton equation ??
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3rd May 2020
7:06 PM
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ICSE IX Chemistry Chemical Changes and Reactions
what is a chemical change
Asked by bhoomikapoor200
16th May 2020
10:31 PM
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ICSE VII Chemistry Physical and Chemical Changes
Physical change is also said that no new substance is form but changing of ice into liquid is also new substance forming
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21st May 2020
10:09 AM
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ICSE VIII Chemistry Physical and Chemical Changes
why melting of candle is both chemical and physical change?
Asked by skarletchristian8290.8sdatl
22nd May 2020
12:08 PM
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CBSE X Chemistry Chemical Reactions and Equations
what is the difference between physical meapns and chemical means.
Asked by dikshamishra6875.6sdatl
30th May 2020
8:27 PM
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ICSE VIII Chemistry Physical and Chemical Changes
what is chemical change
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5th June 2020
8:05 PM
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CBSE VII Science Physical and Chemical Changes
what is chemical change
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6th June 2020
2:05 PM
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CBSE VII Science Physical and Chemical Changes
what is physical and chemical changes
Asked by friends4everp
11th June 2020
2:55 PM
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ICSE VIII Chemistry Physical and Chemical Changes
Burning of phosphorus is a which change
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15th June 2020
12:13 PM
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CBSE VI Science Changes Around Us
Chemical change is ____________
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6th July 2020
4:52 PM
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CBSE VI Science Changes Around Us
what is irrivisible
Asked by rajiraju60822
24th July 2020
12:36 PM
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CBSE VII Science Physical and Chemical Changes
When coal burns it possess a change. a) Which type of change is it? Give reasons in support of your answer. b) What is the reactant here? c) Name the products
Asked by ayankumarbehera99
24th July 2020
3:27 PM
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ICSE VIII Chemistry Chemical Reactions
The composition of a substance ________________ during chemical change
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1st August 2020
4:14 PM
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ICSE X Chemistry Sulphuric Acid
Name the gas evolved when: dil. sulphuric acid reacts with sodium sulphite. Give the balanced chemical equation of the reaction as well.
Asked by ramasareverma99
26th October 2020
9:35 PM
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CBSE IX Chemistry Matter in Our Surroundings
which is not a function of epidermis
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30th October 2020
6:35 PM
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CBSE VII Science Physical and Chemical Changes
Explain the following with reasons: [3] a. Formation of clouds is a physical change. b. Melting of butter to make ghee is a chemical change.
Asked by parthuspoorthy
6th January 2021
1:18 PM
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CBSE VI Science Changes Around Us
Why is cooking of food an irreversible change ?
Asked by drthilakyshetty
10th January 2021
1:27 PM
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CBSE X Chemistry Chemical Reactions and Equations
Question 3
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15th January 2021
8:22 PM
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CBSE VII Science Physical and Chemical Changes
What are Physical and Chemical changes?
Asked by parvmanyam
4th June 2021
7:30 PM
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CBSE XI Science Chemistry Some Basic Concepts of Chemistry
How many gram of nh3 will be produce when 50g N2 react with h2
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7th June 2021
4:36 PM
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ICSE VIII Chemistry Physical and Chemical Changes
Give an example of a chemical,undesirable permanent change.
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7th July 2021
7:19 PM
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CBSE VI Science Changes Around Us
burning of a coal is a _____ change
Asked by meenasudama39
23rd July 2021
10:13 PM
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ICSE IX Chemistry Chemical Changes and Reactions
State the main characteristic of chemical change give at least one example in each case
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24th July 2021
10:24 PM
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CBSE X Chemistry Chemical Reactions and Equations
what is chemical change
Asked by abhishek707356
10th September 2021
10:29 AM
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CBSE VI Science Changes Around Us
Growth of a tree is a chemical change or physical changr
Asked by amitpati2020
11th November 2021
4:05 PM
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CBSE X Science Chemical Reactions and Equations
Write the chemical equation of the reaction in which the following changes have taken place with an example of each: (i) Change in colour (ii) Change in temperature (iii) Formation of precipitate
Asked by pachchigarkeyur
8th March 2022
12:05 PM
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CBSE X Science Chemical Reactions and Equations
chemical colours
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9th May 2022
5:48 PM
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CBSE XI Science Chemistry Equilibrium
please solve
Asked by mangalchandrj79
21st May 2022
4:38 PM
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ICSE IX Chemistry Carbon and Its Compounds
How to learn , understand Chemical reactions in Chemistry.Is there any particular way?
Asked by rashikulkarni28
5th June 2022
7:59 PM
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ICSE VII Chemistry Physical and Chemical Changes
Physical and chemical change
Asked by ishitaagarwal345
28th March 2023
3:58 PM
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