Advertisements
Advertisements
Question
Write your observation and a balanced equation in the case of the following substances being heated.
Copper carbonate.
Solution
Investigating what happens when a compound copper carbonate is heated. When green copper carbonate{CuCO3} is heated it decomposes forming copper oxide {CuO} and carbon dioxide {CO2}.
\[\ce{\underset{\text{Green}}{CuCO3(s)} ->[Heat] \underset{\text{Black}}{CuO(s) + CO2(g)}}\]
APPEARS IN
RELATED QUESTIONS
State whether the following statement is true or false. In case a statement is false, write the corrected statement.
Condensation of steam is not a chemical change.
What are oxides ?
TRUE \ FALSE
Electrolytic refining is a method in which a thin coating of a metal is done over another metal.
Write true or false .
A black residue is formed when sugar is heated .
State four conditions necessary for a chemical reaction to take place.
Define Photochemical reaction
Give an example
State the type of reactions for the following represent and balance the ones that are not balanced.
Cl2 + 2KBr → 2KCl + Br2
Multiple choice:
Which of the following is not a characteristic of a chemical change?
What do you observe when HCI is passed through a silver nitrate solution.
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.
Ammonium dichromate.
Name the following:
The products obtained during ‘photosynthesis’ – which is a chemical change.
Complete the table given below.
| Heat on iodine crystals | Colour of vapours evolved |
Complete the table given below.
| Addition of dil. H2SO4 to zinc | Test for gas evolved |
Match the chemical reactions in List I with the appropriate answer in List II.
| List I | List II | ||
| 1. | \[\ce{XY⇌[heat]X + Y}\] | A: | Displacement reaction |
| 2. | \[\ce{XY->X + Y}\] | B: | Double decomposition |
| 3. | \[\ce{X+Y- + A+B^-->X+B- + A+Y-}\] | C: | Endothermic reaction |
| 4. | \[\ce{X + YZ->XZ + Y}\] | D: | Thermal dissociation |
| 5. | \[\ce{X + Y->[heat]XY -\Delta}\] | E: | Decomposition reaction |
______ is not a chemical change.
______ change results in the change of the substance.
A student took a solution of copper sulphate in a beaker and put a clean iron nail into it and left it for about an hour.
What changes do you expect?
How would you show that the settling of curd is a chemical change?
