Characteristics of Chemical Change
Trending Questions
A chemical change is permanent.
True
False
Hydrogen and carbon dioxide are gases. If they are formed in a reaction you will see ___. This can be a sign that a chemical reaction has happened.
Burning of paper is a physical change.
- True
- False
Why burning of NH4CL is both chemical and physical changes?
A mixture consists of molecules of two or more substances in any proportion such that they undergo a chemical change.
- True
- False
There is a change in the mass of the substance undergoing a chemical change.
- True
- False
Which of the following represents a chemical reaction?
- Conversion of steam to water
- Rusting of iron
- All of the above
- Cutting of wood
During a chemical change, the molecular composition remains the same.
- True
- False
A change, which alters the composition of a substance, is known as a ___________ change.
The chemical changes can be reversed easily.
- True
- False
State whether-
Germination of seeds is a chemical change or physical change.
Fill in the blanks:
New substances are formed in a _____ change.
30. Why are chemical changes called irreversible changes?
6. Write one of the reactions for each of the following characteristics :
(b) change of state
During a chemical change, a new substance is formed.
- True
- False
State the characteristics of chemical change.
- Formation of new products
- Change is mass
- Original properties are changes
- All of above
What is the precipitate formed when aqueous copper sulphate reacts with aqueous ammonium hydroxide?
Ammonium Hydroxide
Copper Hydroxide
Ammonium Sulphate
Copper Sulphate
Define chemical reaction.
During the process of eating we masticate and mix saliva into the food as well. Masticating and salivating are ______&______ processes.
Both are physical
Both are chemical
Physical & chemical
Chemical & physical
Chemical changes cannot be __________.
- Formation of curd from milk
- Dissolution of sugar in water
- Shredding a sheet of paper into bits
- Cooking of food
Write the characteristics of Chemical change.
Which of the following is true regarding rusting?
It is a slow chemical reaction.
It occurs only in iron.
It is called a mild combustion process.
It takes place in the absence of oxygen.
Cooking food is an example of chemical change. Explain?
13 (xii) Against each change described below, write P for physical change and C for chemical change.
Sam burnt the toast.
During a chemical change there is a change in the mass of original substance:
True
False
What happens when we exhale in lime water?
Cold, solid calcium chloride
Cold, solid calcium hydroxide
Heated charcoal
Heated copper oxide
