Understanding Based Questions
1. Pressure and temperature determine the state's of substance. Justify.
2. Solids are denser than liquids and gases. Explain.
3. Water as ice has cooling effect whereas steam causes severe burns. Specify.
4. Pressure cookers are used at higher altitude.
5. People perspire lot on hot humid day. Why?
6. Liquids show the phenomenon of diffusion to more extent than solids.
7. Carbon dioxide is a gas. Give reasons
8. Explain with examples the various factors on which rate of evaporation depend.
9. Tyndall effects are exhibited by both colloidal n Suspension solutions. Explain
10. How Plasma state is created in sun and stars.
Activity Based Question
Write the activity to show following process:
1. The compressibility of solid, liquid and gas.
2. Rate of evaporation increases with increase in surface area.
3. Matter is particulate in nature.
4. Camphor sublimes on heating.
5. Rate of diffusion of liquid decrease with increase in surface area.
Skill Based Questions
1. Draw flow chart for interconversion of three states of matter.
2. Draw flow chart on True, Colloidal, and Suspension solution on the basis of Characteristics properties.
Application Based Questions.
1. Write the application of evaporation causes cooling in ur surroundings.
2. States the application of Plasma n B.C.Condensate in celestial bodies and daily life.
3. Explain the importance of particle motion in giving relief from air pollution hazard.
Higher Order Based Questions.
1. Water boils at 100C.Can we increase or decrease its boiling point.
2. Ice, Water, Steam are not different substance but different States. Which of them is regarded as fluid?
3. Sea water is homogenous as well as heterogeneous mixtures
4. Why Brownian movement can be observed in colloidal particles.
5. Ether and Acetone are stored in dark container n kept at cool place.
Answers
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UNDERSTANDING BASED QUESTION
1
A solid can be converted into liquid and then to gas by decreasing the pressure and increasing the temperature. ... Every state of matter of any substance is stable at a corresponding pressure and temperature. Thus, temperature and pressure determines the state of a substance.
2
solids are generally denser than liquids because solids have particles closely packed and because of that they have more mass . in the case of liquid and gas they have a bit of freely moving particles.
3
When temperature is decreased to 0oC, water turns into ice. Whereas, when temperature is increased to 100oC, water is converted to steam. Water as steam has more latent heat than water in liquid and solid form. Hence, water as steam can cause severe burns while water as ice has a cooling effect.
4
At higher altitude atmospheric pressure is lower than near the sea. This causes the water to boil at a lower temperature (below 100), Due to this it takes longer time for food to be cooked. A pressure cooker prevents boiling of water at lower temperature and leads to quicker cooking of the food
5
It's excretion of fluid by the body that evaporates immediately and thereby serves as a means to regulate body temperature. ... - On hot humid days, water is evaporated slowly, thus more of this sweat is retained. - Therefore, we perspire more during hot humid days
6
Because the molecules in liquids are packed distant from each molecule(there is gap between each molecule). Diffusion occurs more extently in liquids because diffusion depends on molecular space. But in solids molecules are tightly packed(there is a little internal space). So in solids diffusion occurs slowly.
7
Carbon Dioxide is gas because of the following reasons : The molecules present in the carbondioxide have more space between them. The carbon dioxide is not rigid. ... As a result , we can say that carbon dioxide is gas because it undergoes all the properties of a gas.
8
The rate of evaporation depends on the liquid's exposed surface area (faster when increased), the humidity of surroundings (slower when increased), the presence of wind (faster when increased) and the temperature (faster when increased)
9
The dispersed particles of a colloid cannot be separated by filtration, but they scatter light, a phenomenon called the Tyndall effect .
...
Colloids.
SolutionsColloidsSuspensionsDo not scatter lightScatter light (Tyndall effect)May either scatter light or be opaque
10
Stellar Winds and Coronal Heating
The solar wind is a stream of charged particles—a plasma—that are ejected from the upper atmosphere of the sun and stars. It consists mostly of electrons and protons with energies of about 1 keV.
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