Advertisements
Advertisements
Question
Give the reason why the following is considered as chemical changes.
A piece of magnesium strip is dropped into a beaker containing dilute hydrochloric acid.
Advertisements
Solution
When a piece of magnesium strip is dropped in dilute hydrochloric acid, hydrogen gas is evolved and hence it is a chemical change.
\[\ce{Mg + dil{.} 2HCl -> MgCl2 + H2↑}\]
as new substances, MgCl2 and H2 with new properties are produced and the reaction is irreversible.
APPEARS IN
RELATED QUESTIONS
Fill in the blank.
An earthquake is a .................. change.
Write short answer.
Give two examples of periodic changes
Classify the following changes as physical or chemical:-boiling
State whether the following is physical or chemical changes.
growing of a piglet into a pig —
What are man-made changes ?
State the Differences Between a Physical Change and a Chemical Change.
Which of the following are physical changes and which are chemical changes ?
Given reason:
Burning of paper is a chemical change.
State which of the following 1 to 5 pertain to – A: Physical Change B: Chemical change :
- Sublimation.
- Fermentation.
- Liquefaction or condensation.
- Magnetization.
- Respiration.
Digestion of food is a physical change.
