Class 8
Dashboard
Science
The Amazing World of Solutes, Solvents, and Solutions
NCERT Solutions
NCERT Solutions
The Amazing World of Solutes, Solvents, and Solutions
12 Solutions
Q1
Keep the curiosity alive
State whether the statements given below are True [T] or False [F]. Correct the false statement(s).
(i)
Oxygen gas is more soluble in hot water rather than in cold water.
(ii)
A mixture of sand and water is a solution.
(iii)
The amount of space occupied by any object is called its mass.
(iv)
An unsaturated solution has more solute dissolved than a saturated solution.
(v)
The mixture of different gases in the atmosphere is also a solution.
Q2
Keep the curiosity alive
Fill in the blanks.
(i)
The volume of a solid can be measured by the method of displacement, where the solid is ______ in water and the ______ in water level is measured.
(ii)
The maximum amount of ______ dissolved in ______ at a particular temperature is called solubility at that temperature.
(iii)
Generally, the density ______ with increase in temperature.
(iv)
The solution in which glucose has completely dissolved in water, and no more glucose can dissolve at a given temperature, is called a ______ solution of glucose.
Q3
Keep the curiosity alive
You pour oil into a glass containing some water. The oil floats on top. What does this tell you?
(i)
Oil is denser than water
(ii)
Water is denser than oil
(iii)
Oil and water have the same density
(iv)
Oil dissolves in water
Q4
Keep the curiosity alive
A stone sculpture weighs 225 g and has a volume of
90
cm
3
90 \text{ cm}^3
90
cm
3
. Calculate its density and predict whether it will float or sink in water.
Q5
Keep the curiosity alive
Which one of the following is the most appropriate statement, and why are the other statements not appropriate?
(i)
A saturated solution can still dissolve more solute at a given temperature.
(ii)
An unsaturated solution has dissolved the maximum amount of solute possible at a given temperature.
(iii)
No more solute can be dissolved into the saturated solution at that temperature.
(iv)
A saturated solution forms only at high temperatures.
Q6
Keep the curiosity alive
You have a bottle with a volume of 2 litres. You pour 500 mL of water into it. How much more water can the bottle hold?
Q7
Keep the curiosity alive
An object has a mass of 400 g and a volume of
40
cm
3
40 \text{ cm}^3
40
cm
3
. What is its density?
Q8
Keep the curiosity alive
An unpeeled orange floats in water, while the same orange with its peel removed sinks. Explain this observation.
Q9
Keep the curiosity alive
Object A has a mass of 200 g and a volume of
40
cm
3
40 \text{ cm}^3
40
cm
3
. Object B has a mass of 240 g and a volume of
60
cm
3
60 \text{ cm}^3
60
cm
3
. Which object is denser?
Q10
Keep the curiosity alive
Reema has a piece of modeling clay that weighs 120 g. She first moulds it into a compact cube that has a volume of
60
cm
3
60 \text{ cm}^3
60
cm
3
. Later, she flattens it into a thin sheet. Predict what will happen to its density.
Q11
Keep the curiosity alive
A block of iron has a mass of 600 g and a density of
7.9
g
/
cm
3
7.9 \text{ g}/\text{cm}^3
7.9
g
/
cm
3
. What is its volume?
Q12
Keep the curiosity alive
A test tube is filled with a liquid and sealed with a stopper that has a narrow glass tube inserted through it. The liquid rises to a certain level in the narrow tube. When this apparatus is placed in hot water (
∼
70
∘
C
\sim 70^\circ\text{C}
∼
7
0
∘
C
), the liquid level in the narrow tube rises further. How does this heating affect the density of the liquid?
More from this chapter
Chapter overview
Notes
Important Points
Practice Questions
Flashcards