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
State whether the following is physical or chemical changes.
Slaking of lime —
A physical change is temporary. Explain.
Classify the following as physical or chemical change :
Growth of a plant
Give the main differences between physical changes and chemical changes.
Which of the following are physical changes and which are chemical changes ?
Rusting of iron
Classify the Following as a Physical Or a Chemical Change.
Making of a Sugar Solution
Fill in the blank.
A change, which alters the composition of a substances, is known as a___________ change.
What will you take into account while identifying the following?
A physical change in a substance.
Change is the law of nature and occurs in our everyday life, at all times and in all places.
Differentiate between the following change with a suitable example.
Slow and fast change.
Give the reason why the following is considered as chemical changes.
Sulphur when burnt in air evolves a gaseous acidic product.
