Download App

CHEMISTRY [2 Mark Question Answer]

Elements, Compounds and Mixtures · ICSE STD 8 (ICSE - English Medium). 7 questions.

Questions

[2 Mark Question Answer]

🎯

Test yourself on this topic

7 questions · timed · auto-graded

Question 12 Marks
Zinc is considered an element, while zinc sulphide is considered a compound.
Answer
Zinc $[Zn]$ is an element as zinc is a pure substance made up of one kind of atoms all having same size, atomic number and atomic mass. Zinc sulphide $\ce{[ZnS]}$ is pure substance made up of two element $[$atoms$]$ of zinc and sulphur combined chemically in a fixed proportion.
View full question & answer→
Question 22 Marks
Brass $\&$ bronze are examples of mixtures, while copper sulphate $\&$ lead nitrate are examples of compounds.
Answer
Brass and bronze are mixtures as the composition of elements is not fixed by mass and have no formula.
Lead nitrate and copper sulphate are compounds as they have fixed ratio of elements by mass and have formula like $\ce{Pb[N03]2}$ and $\ce{CuS04.}$
View full question & answer→
Question 32 Marks
The filter paper made into a cone & placed in a funnel for filtering out the solid particles in a solid$-$liquid mixture, should be moistened before placing.
Answer
Moistening the filter paper cone sticks to the walls of the funnel and also makes filtration convenient.
View full question & answer→
Question 42 Marks
Centrifugation can be used for separating an insoluble heavier solid, present in an $–$ insoluble solid$-$liquid mixture.
Answer
Centrifugation is fast method to separate suspended $($heavier$)$ insoluble solid from lighter liquid by rotating the mixture fast. Heavier solid settles down at the bottom.
View full question & answer→
Question 52 Marks
Components in a mixture can be separated by physical methods only.
Answer
Components of a mixture can be separated by physical methods because particles remain separate without chemical reaction between them.
View full question & answer→
Question 72 Marks
Represent with the help of a simple chart how matter is classified into pure or impure substances $\&$ further into elements, compounds $\& $ mixtures, with elements further segmented.
View full question & answer→
Generate Paper FreeAll Elements, Compounds and Mixtures topics
[2 Mark Question Answer] - CHEMISTRY STD 8 Questions - Vidyadip