3. How does the density of a liquid change with the
rise in its temperature?
4. On the basis of change of density with the
change in temperature, explain how do the liquids
get heated up, when heated in a vessel.
5. (a) How does the density of gases change with
the rise in temperature?
(b) What is the importance of above phenomenon
in the formation of weather?
6. How is land breeze formed? Explain.
7. How is sea breeze formed? Explain.
8. Two solids A and B of density 2.5 gcm-3 and
0.80 gcm-3 are placed in a liquid L of density
1.2 gcm-3. Which solid is likely to float and why?
9. Why do objects like metals or stones sink in
water?
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Answers
3. How does the density of a liquid change with the rise in its temperature?
A→ Cooling a substance/liquid causes molecules to slow down and get slightly closer together, occupying a smaller volume that results in an increase in density. Therefore, with rise with temperature, the density decreases.
4. On the basis of change of density with the change in temperature, explain how do the liquids get heated up, when heated in a vessel.
A→ When the liquid is heated, the kinetic energy of the molecules increases leads to increase in the velocity of the water molecules, due to which inter-molecular force decreases and molecules starts to getting away from each other. this reduces the density of water which is kept under heating.
5. (a) How does the density of gases change with the rise in temperature?
(b) What is the importance of above phenomenon in the formation of weather?
A→ (a) On heating temperature increases. With the increase in T inter-molecular distance increases and so inter-molecular forces decreases (IMF). With the decrease in IMF the volume of gas gets increases.
We know the formula,
Density= Mass / Volume
From this we can understand that density is inversly propotional to volume. i.e, if density increases volume decrease and vice-versa.
So here volume increases so density decreases.
On rise in temperature the density of the gas decreases.
(b) When the density of gases decrease, they rise up, and denser gases come to fill the gap left behind by the less denser gases. Due to this, the wind speed increases and low-pressure & high-pressure are created. This leads to change in weather.
6. How is land breeze formed? Explain.
A→ In the day, when the sun is up, the land heats up very quickly and the air above it warms up a lot more than the air over the water. The warm air over the land is less dense and begins to rise. Low pressure is created.
7. How is sea breeze formed? Explain.
A→ During the day, the land gets heated faster than the water. The air over the land becomes hotter and rises up. The cooler air from the sea rushes in towards the land to take its place. The warm air from the land moves towards the sea to complete the cycle. The air from the sea is called the sea breeze.
8. Two solids A and B of density 2.5 gcm⁻³ and 0.80 gcm⁻³ are placed in a liquid L of density 1.2 gcm⁻³. Which solid is likely to float and why?
A→ B because its density is lower than the density of the liquid L.
9. Why do objects like metals or stones sink in water?
Density is an important concept when discussing whether substances will float or sink in another substance because it is numerical quantity associated with how much Stuff is packed into the shape of the object.
As their density is more than the density of the water at that specific point, so they have a tendency to sink.
Answer:
Cooling a substance/liquid causes molecules to slow down and get slightly closer together, occupying a smaller volume that results in an increase in density. Therefore, with rise with temperature, the density decreases.
$$\rule{150}2$$
4. On the basis of change of density with the change in temperature, explain how do the liquids get heated up, when heated in a vessel.
A→ When the liquid is heated, the kinetic energy of the molecules increases leads to increase in the velocity of the water molecules, due to which inter-molecular force decreases and molecules starts to getting away from each other. this reduces the density of water which is kept under heating.
$$\rule{150}2$$
5. (a) How does the density of gases change with the rise in temperature?
(b) What is the importance of above phenomenon in the formation of weather?
A→ (a) On heating temperature increases. With the increase in T inter-molecular distance increases and so inter-molecular forces decreases (IMF). With the decrease in IMF the volume of gas gets increases.
We know the formula,
Density= Mass / Volume
From this we can understand that density is inversely proportional to volume. i.e, if density increases volume decrease and vice-versa.
So here volume increases so density decreases.
On rise in temperature the density of the gas decreases.
(b) When the density of gases decrease, they rise up, and denser gases come to fill the gap left behind by the less denser gases. Due to this, the wind speed increases and low-pressure & high-pressure are created. This leads to change in weather.