Advertisements
Advertisements
Question
What happens when cane sugar is strongly heated? Mention any two changes in it.
Solution
- Sugar is basically Sucrose.
- The molecular formula of Sugar is C12 H22O11 (or) C12(H2O)11.
- When sugar is heated, it loses all water molecules and decomposes to carbon.
- Chemical change;
- Irreversible change
APPEARS IN
RELATED QUESTIONS
Name three biochemical catalysts found in the human body.
TRUE \ FALSE
Copper can displace iron from iron sulphate.
Balance the following equation :
Fe + H2O → Fe3O4 + H2
Give an example of the following chemical change.
Two gases combine to form white solid
Write the chemical reaction where the following changes are observed.
Gas is evolved
Give an example of the following chemical changes.
A reaction where colour change is noticed.
Define:
Photochemical reaction
Give one example
State the original colour of the following substance and colour of residue obtained after heating.
Copper carbonate
Give a chemical test to distinguish between the following gases.
CO2 and SO2
Distinguish by dilute sulphuric acid.
Copper and magnesium?
Give examples of exothermic reactions i.e. heat evolved in each of the following:
(a) reaction between a solid and a liquid
(b) reaction between two gases
Give two examples of exothermic reactions seen in everyday life.
Select the correct answer for the following options:
The black residue obtained on heating copper carbonate.
Give a word equation for the following reaction.
Two gases which combine to give a solid.
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.
Complete the table given below.
| Addition of dil. H2SO4 to FeS | Odour of gas evolved |
Burning of paper is a ______ change.
______ is a natural indicator.
Classify the following as physical or chemical properties
Zinc dissolves in hydrochloric acid with the evolution of hydrogen gas.
If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.
Can you change rust back into iron by some simple method?
Give an example where heat, light, and sound are produced during a chemical change.
