Give reasons for the following.
a. Solids are hard and rigid.
b. Liquids take the shape of
the containers.
c. Molecules in a gas can move around
freely in any direction.
d. Chemical changes are mostly
permanent.
e. In case of expansion, the size of a
substance increases on heating
Answers
1.because they have less intemolecular space
2. because the liquid state of matter is an intermediate phase between solid and gas. ... The movement of the particles causes the liquid to be variable in shape. Liquids will flow and fill the lowest portion of a container, taking on the shape of the container but not changing in volume.
3.because gases have weak intemolecular force of attraction
4.Since the original composition of the substance changes, one or more new substances are formed. Forms of energy, such as heat, light or electricity, may be emitted or absorbed. A chemical change is generally irreversible.
5.because when heated the molecules of that substace gain more energy and vibrate more rapidly
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Answer:
A . yes , the solids are rigid and hard
B . yes the liquids take the shape of the container
C . molecules in a gas can move around freely in any direction
D . chemical changes are mostly permanent
E . In case of expansion of the size of substance increase on heating
Explanation:
A . because of the molecules of tightly packed and the molecules can't move
B . liquid molecules are loosely packed that is why they take the shape of container
C . molecules of gas are very loosely packed that is why you can smell the agarbatti
D . chemical changes are mostly permanent because of the substance like milk turns into curd it depends upon substance
E . the expansion takes place in substance in increasing of heat because of kinetic energy it means the molecules vibrate and because of that increase in size happens