Advertisements
Advertisements
प्रश्न
True or false
New substances are formed in a chemical change.
विकल्प
True
False
Advertisements
उत्तर
True
APPEARS IN
संबंधित प्रश्न
Define catalyst.
FILL IN THE BLANK
Negatively charged ions are called ..........
TRUE \ FALSE
Positively charged electrode is called the anode. True or false ?
How is precipitate formation in a chemical reaction indicated?
What are homogenous reactions ?
Fill in the blank:
During a chemical reaction transfer of ________ takes place.
Fill in the blank:
The basic conditions necessary for a chemical reaction is _______
Complete the statement by filling the gaps using appropriate term from the terms given in the bracket.
(slow, coloured, arrow, fast, smell, milky, physical, product, chemical, reactant, covalent, ionic, octet, duplet, exchange, sharing, equality sign)
Chlorine (Cl2) molecule is formed by ______ of electrons between two chlorine atoms.
What is a chemical reaction?
Name: Two nitrates that do not produce nitrogen dioxide on heating.
What do you observe when H2S is passed through a lead nitrate solution.
Write your observation and a balanced equation in the case of the following substances being heated.
Copper nitrate.
Distinguish by dilute sulphuric acid.
Sodium Sulphite and sodium carbonate?
Give balanced equation for the following conversion affected by heat alone on the substance:
Hydrated copper sulphate to sulphur dioxide
Circle the odd one out. Give reason for your choice
True or False. If false, give the correct answer.
Taking a glass of water and freezing it by placing it in the freezer is a chemical change.
A bag of cement lying in the open gets wet due to rain during the night. The next day the sun shines brightly. Do you think the changes, which have occurred in the cement, could be reversed?
On heating calcium carbonate gets converted into calcium oxide and carbon dioxide.
(a) Is this a physical or a chemical change?
(b) Can you prepare one acidic and one basic solution by using the products formed in the above process? If so, write the chemical equation involved.
______ is the chemical name of slaked lime.
What are the chemical reactions that occur in everyday life?
