Advertisements
Advertisements
Question
Distinguish by heating the following in dry test tubs.
Copper Sulphate and copper carbonate
Solution
| Copper sulphate | Copper carbonate | |
| Residue left | Anhydrous(CuSO4) | Copper oxide(CuO) |
| Colour of residue | The colour of the residue is Dirty white. | The colour is black solid. |
| Gas produced | Water vapour (H2O) is produced. | Carbon dioxide(Co2) is produced. |
APPEARS IN
RELATED QUESTIONS
How would you show that setting of curd is a chemical change?
Fill in the blanK
A .............is a substance which changes the rate of a chemical reaction without undergoing a chemical change.
Differentiate between in Chemical reaction and chemical equation.
A chemical equation is a statement that describes a chemical change in terms of
Balancing a chemical equation is based on
Choose the correct option from the bracket and explain the statement giving reason.
(Oxidation, displacement, electrolysis, reduction, zinc, copper, double displacement, decomposition)
The conversion of ferrous sulphate to ferric sulphate is ______ reaction.
State the type of reactions for the following represent and balance the ones that are not balanced.
NaOH + HCl → NaCl + H2O
Multiple choice:
A reaction of a type: AB + CD → AD + CD, involves
Define:
Electrochemical reaction
Give one example
Give a word equation for the following reaction.
A salt which reacts with ammonium hydroxide to give a reddish brown precipitate.
A chemical reaction is often accompanied by external indications or characteristics which include –
- Colour change
- Effervescence or gas evolved
- Evolution or absorption of heat
- Formation of a precipitate.
With reference to each of the above indications, state the external indication seen during – Addition of dilute hydrochloric acid to silver nitrate.
Give balanced equation for the following conversion affected by heat alone on the substance:
Hydrated copper sulphate to sulphur dioxide
Complete the table given below.
| Heat on copper carbonate | Test for gas evolved |
Explain with the help of balanced equations, how precipitation reactions are used for identifying the positive radicals in three different salts, each having a different cation [positive ion].
Select the correct answer from the options given below:
State the gaseous product formed, when
An active metal reacts with dilute sulphuric acid.
A reaction between an acid and a base is called ______.
Water boiling into water vapour is an example of chemical change.
Give an example of a chemical reaction for each of the following situations:
A change in colour is observed.
The chemical name of baking soda is sodium bicarbonate.
Collect information about the types of fuels used for cooking in your area. Discuss with your teachers/parents/others which fuels are less polluting and why.
