Advertisements
Advertisements
Question
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 water to quicklime.
Advertisements
Solution
Addition of water to quick lime: Hissing sound accompanied by a lot of heat (boiling).
APPEARS IN
RELATED QUESTIONS
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Miscible liquids having slightly different boiling points can be separated by the
- evaporation
- distillation
- fractional distillation
- sedimentation
Differentiate between in Chemical reaction and chemical equation.
Give reason for the following:
Silver nitrate solution is kept in coloured bottles.
When hydrogen burns in oxygen, water is formed; when electricity is passed through water, hydrogen and oxygen are given out. Name the type of chemical change involved in the two cases.
Explain,giving one example of the following chemical changes:
Reversible reaction
State the type of reactions for the following represent and balance the ones that are not balanced.
NaOH + HCl → NaCl + H2O
Give one example electrochemical reaction.
Name: Two carbonates do not produce carbon dioxide on heating.
What do you observe when Cobalt chloride paper is introduced in water vapour.
Write your observation and a balanced equation in the case of the following substances being heated.
Copper nitrate.
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 acid to an active metal.
Give balanced equation for the following conversion affected by heat alone on the substance:
Ammonium dichromate to nitrogen
Give balanced equation for the following conversion affected by heat alone on the substance:
Zinc nitrate to nitrogen dioxide
When lithium metal is placed in hydrochloric acid, _______ gas is evolved.
When an aqueous solution of potassium chloride is added to an aqueous solution of silver nitrate, a white precipitate is formed. Give the chemical equation of this reaction.
What is the use of indicator?
Write a note on the following:
Curdling of milk
Write the characteristics of chemical change.
What is thermochemical reactions?
Define the following term:
Chemical change
