Q 1: Fill in the blanks:-
1. Matter is made up of small_________
2. The forces of attraction between the particles are _______ in solids, ______ in liquids and _________ in gases.
3. __________ is the change of gaseous state directly to solid state without going through liquid state, and vice-versa.
4. Evaporation causes __________
5. Latent heat of fusion is the amount of heat energy required to change 1 kg of solid into liquid at its ________
6. Solid, liquid and gas are called the three _______ of matter
7. The smell of perfume gradually spreads across a room due to ______
8. Rapid evaporation depends on the ______ area exposed to atmosphere
9. As the temperature of a system increases, the pressure of the gases ______
10. As the volume of a specific amount of gas decreases, it’s pressure _______
11. Gas molecules at higher temperatures have more _______ than at cooler temperatures.
12. Usually the total charge of a plasma is _______
13. The pressure inside of a sealed tube if you raise the temperature go ______
14. Forces of attraction in liquids are _______ than in solid
15. Liquids that move quickly downhill are described as having _____
16. A mixture contains more than ______ substance mixed in ______ proportion.
17. A solution is defined as a mixture that is----------
18. We can remove salts from a solution by using the process of ----------
19. A pure substance has a fixed__________ or ______ at constant temperature.
20. An element is made up of only one kind of _________.
21. Miscible liquids are separated by ________
22. Immiscible liquids are separated by using a _______
23. Alloy is a _______
24. Sublimation of camphor is a _________ change.
25. Most common chemical change we observe in our routine life is rusting of______.
Answers
Words that fill the above blanks are:
1. Particles
2. Maximum, intermediate, minimum
In solids space between the molecules are negligible and they are closely packed, in liquids the molecules are close but have bigger space than in that of solids, and in gases, the molecules occupy the whole space, and they have larger space as compared to liquids.
3. Sublimation
It is a physical process of separation where any substance in the solid state can change directly to its gaseous state and vice versa, without going through the intermediate liquid state.
4. Cooling
5. Melting point
6. States
7. Diffusion
8. Surface
9. Increases
10. Increases
11. Kinetic energy
12. Zero
13. Up
14. Weaker
15. Low viscosity
16. One, any
17. Homogeneous
18. Evaporation
A process through which liquid changes to a gas. Here, if the solution is evaporated the salt will be left behind and get separated from the solution.
19. Melting point, boiling point
20. Atoms
21. Fractional distillation
22. Separating funnel
23. Solid solution
Alloy is a mixture of two or more elements or metals and nonmetals, which is the form of a solid solution.
24. Physical
25. Iron
There are many things and objects in our surroundings made up of iron which corrodes away due to oxidation. This is why we can observe rusting as a part of our daily life.
Answer:
1. D
2. C
3. D
4. C
5. C
6. A
7. D
8. A
9. A
10. A
11. C
12. A
13. C
14. A
15. B
Explanation:
john charles b arnado