Assertion: Air is a mixture. Reason: A mixture is formed when two or more substances are mixed Class 8
Assertion: Air is a mixture. Reason: A mixture is formed when two or more substances are mixed Class
Consider the following reaction where two substances, A and B, combine to form a product Class 8
Consider the following reaction where two substances, A and B, combine to form a product Class 8Cons
Are common salt and sugar elements or compounds? Class 8
Are common salt and sugar elements or compounds? Class 8Are common salt and sugar elements or compou
Why cannot we separate hydrogen and oxygen present in water by physical means? Class 8
Why cannot we separate hydrogen and oxygen present in water by physical means? Class 8Why cannot we
How could the discovery of a compound that absorbs carbon dioxide from the air contribute to solving environmental Class 8
How could the discovery of a compound that absorbs carbon dioxide from the air contribute to solving
How can elements be combined to form a compound? Class 8
How can elements be combined to form a compound? Class 8How can elements be combined to form a compo
Which of the entities in the picture (given in your textbook) consist of matter, and which of them do not? Class 8
Which of the entities in the picture (given in your textbook) consist of matter, and which of them d
Which of the entities in the picture (given in your textbook) consist of matter, and which of them do not? Class 8
Which of the entities in the picture (given in your textbook) consist of matter, and which of them d
Which of the entities in the picture (given in your textbook) consist of matter, and which of them do not? Class 8
Which of the entities in the picture (given in your textbook) consist of matter, and which of them d
Debate in the class - 'Gases can spread and fill all the available space'. Is this property of gases Class 8
Debate in the class - 'Gases can spread and fill all the available space'. Is this property of gases
Pretend to be particles of solids, liquids, and gases, at different temperatures create and perform Class 8
Pretend to be particles of solids, liquids, and gases, at different temperatures create and perform
Design and create simple models to represent particles of solids, liquids, and gases Class 8
Design and create simple models to represent particles of solids, liquids, and gases Class 8Design a
Fix a balloon over the neck of a bottle and put the bottle in hot water. Explore what will happen? Class 8
Fix a balloon over the neck of a bottle and put the bottle in hot water. Explore what will happen? C
Grains of rice and rice flour take the shape of the container when placed in different jars. Are they solids or liquids? Explain. Class 8
Grains of rice and rice flour take the shape of the container when placed in different jars. Are the
Why does the water in the ocean taste salty, even though the salt is not visible? Explain. Class 8
Why does the water in the ocean taste salty, even though the salt is not visible? Explain. Class 8Wh
Observe figure (a), which shows the image of a candle that was just extinguished after burning for some time Class 8
Observe figure (a), which shows the image of a candle that was just extinguished after burning for s
Draw a picture representing particles present in the following. Class 8
Draw a picture representing particles present in the following. Class 8Draw a picture representing p
Represent diagrammatically the changes in the arrangement of particles as ice melts and transforms into water vapour Class 8
Represent diagrammatically the changes in the arrangement of particles as ice melts and transforms i
When spilled on the table, milk in a glass tumbler flows and spreads out, but the glass tumbler stays in the same shape. Class 8
When spilled on the table, milk in a glass tumbler flows and spreads out, but the glass tumbler stay
Why do gases mix easily, while solids do not? Class 8
Why do gases mix easily, while solids do not? Class 8Why do gases mix easily, while solids do not? C
Choose the correct answer with justification. If we could remove all the constituent particles from a chair Class 8
Choose the correct answer with justification. If we could remove all the constituent particles from
Which of the following statements are true? Correct the false statements. Class 8
Which of the following statements are true? Correct the false statements. Class 8(i) Melting ice int
Keep the curiosity alive (Pages 113-114) Choose the correct option. Class 8
Keep the curiosity alive (Pages 113-114) Choose the correct option. Class 8Choose the correct option
Can you share a few other real-life situations where you have experienced the movement of gas particles? Class 8
Can you share a few other real-life situations where you have experienced the movement of gas partic
Activity 7.9 Let us find out (Page 110) Light an incense stick in one corner of the room Class 8
Activity 7.9 Let us find out (Page 110) Class 8Activity 7.9 Let us find out (Page 110) Class 81. Lig
Activity 7.7 Let us observe (Page 108) Sugar and sand are both solids. Why does sugar dissolve in water Class 8
Activity 7.7 Let us observe (Page 108) Class 8Sugar and sand are both solids. Why does sugar dissolv
What role does the interparticle spacing play in determining the properties of each state (solid, liquid, and gas) Class 8
What role does the interparticle spacing play in determining the properties of each state (solid, li
Do gases also have a fixed volume? Class 8
Do gases also have a fixed volume? Class 8Do gases also have a fixed volume? Class 8Answer: No, gase
Solids have a definite volume; what about liquids and gases? Class 8
Solids have a definite volume; what about liquids and gases? Class 8 Solids have a definite volume;
Activity 7.3 Let us find out (Page 102) In which of the above six objects do you think particles are strongly held together?
Activity 7.3 Let us find out (Page 102) In which of the above six objects do you think particles are
In the solid state, is there any way to move these particles apart? Class 8
In the solid state, is there any way to move these particles apart? Class 8In the solid state, is th
How are constituent particles held together in solids? Class 8
How are constituent particles held together in solids? Class 8How are constituent particles held tog
How are constituent particles held together in solids? Class 8
How are constituent particles held together in solids? Class 8How are constituent particles held tog
How are the constituent particles held together to form the solid pieces we see? Class 8
How are the constituent particles held together to form the solid pieces we see? Class 8How are the
Activity 7.1 Let us explore (Page 99) Is every speck of this fine chalk powder still composed of the same substance Class 8
Activity 7.1 Let us explore (Page 99) Class 8Activity 7.1 Let us explore (Page 99) Class 81. Is ever
Is the air we breathe today the same that existed thousands of years ago? Class 8
Is the air we breathe today the same that existed thousands of years ago? Class 8Is the air we breat
We cannot see air, so how does it add weight to an inflated balloon? Class 8
We cannot see air, so how does it add weight to an inflated balloon? Class 8We cannot see air, so ho
Why does water take the shape of folded hands but lose that shape when released? Class 8
Why does water take the shape of folded hands but lose that shape when released? Class 8Why does wat
Why is it possible to pile up stones or sand, but not a liquid like water? Class 8
Why is it possible to pile up stones or sand, but not a liquid like water? Class 8Why is it possible
Explain why holes are made in banners and hoardings. Class 8
Explain why holes are made in banners and hoardings. Class 8Explain why holes are made in banners an
Explain the process that causes lightning. Class 8
Explain the process that causes lightning. Class 8Explain the process that causes lightning. Class 8
What is a thunderstorm? Explain the process of its formation. Class 8
What is a thunderstorm? Explain the process of its formation. Class 8What is a thunderstorm? Explain
Describe an activity to show that air flows from a region of high pressure to a region of low pressure. Class 8
Describe an activity to show that air flows from a region of high pressure to a region of low pressu
The figure shows trees along the sea coast on a summer afternoon. Identify which side is land - A or B. Explain your answer Class 8
The figure shows trees along the sea coast on a summer afternoon. Identify which side is land - A or
Explain how a storm becomes a cyclone. Class 8
Explain how a storm becomes a cyclone. Class 8Explain how a storm becomes a cyclone. Class 8Answer:F
What will happen to the two identical balloons A and B as shown in Fig. 6.24 when water is filled into the bottle up Class 8
What will happen to the two identical balloons A and B as shown in Fig. 6.24 when water is filled in
Would lightning occur if air and clouds were good conductors of electricity? Give reasons for your answer. Class 8
Would lightning occur if air and clouds were good conductors of electricity? Give reasons for your a
There are two boats, A and B. Boat A has a base area of 7 m2, and 5 persons are seated in it Class 8
There are two boats, A and B. Boat A has a base area of 7 m2 and 5 persons are seated in it Class 8T
An elephant stands on four feet. If the area covered by one foot is 0.25 m2, calculate the pressure exerted Class 8
An elephant stands on four feet. If the area covered by one foot is 0.25 m2, calculate the pressure
Figure 6.23 (a) shows a boy lying horizontally, and Figure 6.23 (b) (see figure in your textbook) Class 8
Figure 6.23 (a) shows a boy lying horizontally, and Figure 6.23 (b) (see figure in your textbook) Cl