Matter In Our Surrounding Class 9 Chemistry Worksheet Pdf
Class 9 Chemistry students should refer to the following printable worksheet in Pdf for Matter In Our Surrounding in standard 9. This test paper with questions and answers for Grade 9 Chemistry will be very useful for exams and help you to score good marks
Class 9 Chemistry Worksheet for Matter In Our Surrounding
CBSE Class 9 Chemistry Worksheet - Matter in Our Sorrounding
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Question. Which of the following has highest kinetic energy?
(a) Particles of ice at o ·c
(b) Particles of water at 0 ·c
(c) Particles of water at 100 ·c
(d) Particles of steam at 100 ·c
Answer : D
Question. Which of the following is not endothermic process?
(d) Insoluble heavy impurities
Answer : C
Question. CO2 can be easily liquefied and even solidified because
(a) It has weak forces of attraction
(b) It has comparatively more force of attraction than other gases
(c) It has more intermolecular space
(d) It Is present In atmosphere.
Answer : B
Question. Under which of the following conditions we can boil water at room temperature?
(a) At low pressure
(b) At high pressure
(c) At very high pressure
(d) At atmospheric pressure
Answer : A
Question. Which of the following does not affect rate of evaporation?
(a) Wind speed
(b) Surface area
(d) Insoluble heavy Impurities
Answer : D
Question. The colour of vapours formed on sublimation of iodine solid Is
(a) Purple (violet)
Answer : A
Exam Questions NCERT Class 9 Science Chapter 1 Matter in Our Surroundings
Question State the effect of pressure on boiling point.
Answer : Boiling point increases with increase in pressure.
Question. Name any two substances which sublime.
Answer : Camphor and naphthalene.
Question Define condensation.
Answer : The change of solid state from liquid state on cooling
Question Which is the slow process, evaporation or boiling?
Answer : Evaporation.
Question. What is the effect of surface area on rate of evaporation?
Answer : If the surface area is increased, the rate of evaporation increases.
Question A karate expert can easily move his hand through a solid block of wood but we cannot. Why?
Answer : In a solid block of wood, the inter-particle forces are very strong and hence, it is not easy to separate the particles. Therefore, it is not easy to move our hand through a solid block of wood, only a karate expert can do it as he has expertise in this.
Question What is latent heat of fusion?
Answer : The heat required to change 1 kg of a solid substance into liquid state at the melting point of the substance.
For example : Amount of heat required to melt ice at 0°C into water, at 0°C will be known as the latent heat of fusion of ice.
Question. Why is ice at 273 K more effective in cooling than water at the same temperature?
Answer : Ice at 273 K will absorb heat energy or latent heat from the medium to overcome the fusion to become water. Hence the cooling effect of ice is more than the water at same temperature because water does not absorb this extra heat from the medium.
Question. Explaln why solids have fixed shape but liquids and gases do not have fixed shape
Answer : solids have fixed shape but liquids and gases do not have fixed shape because the intermolecular space between the atoms of solid matter is very less, the particles just so vibratory and rotatory motion where is an liquid and gases particles or atoms or molecules present In the matter are not so tightly packed In fact they are loosely packed. This change in space between the particles makes them fixed and unfixed In shape.
Question. Pressure and temperature determine the state of a substance. Explain.
Answer : When a solid is heated then there is Increase in temperature which causes breakage In between strong Intermolecular bonds of the atoms. As a result. the atoms move at a distance and start to collide. Thus, there will be increase in the kinetic energy and there will be change In the state of matter. For example, when ice is kept at room temperature then it starts to melt because of the surrounding heat. As a result, it changes into water. on further increasing the temperature, the liquid state will convert into gaseous state. Similarly, when we Increase pressure on a liquid substance or matter then the molecules start to come closer to each other. As a result. the liquid state will change Into solid. Also, when pressure Is Increased on a gas It will start to conve·rt into liquid state.
Question. How can matter change Its state?
Answer : Matter changes state when energy is added or taken away. Most matter changes because of heat energy. When matter is heated enough, the molecules move faster and with greater energy. If enough heat
is added, a solid can become liquid and a liquid can become gas.
Question. With the help of an example, explain how diffusion of gases in water is essential?
Answer : The gases from the atmosphere diffuse and dissolve in water. Gases like oxygen and carbon dioxide diffuse in water, are essential for the survival of aquatic animals and plants. Animals breathe in this oxygen dissolved in water for their survival and plants can use carbon dioxide dissolved in water for photosynthesis.
Question. Give reason for the following observations.
(a) Naphthalene balls disappear with time without leaving any solid.
(b) We can get the smell of perfume sitting several metres away.
Answer : (a) Naphthalene balls disappear with time without leaving any solid, because naphthalene balls sublime and directly changes into vapour state without leaving any solid.
(c) We can get the smell of perfume sitting several metres away because perfume contain volatile solvent and diffuse faster and can reach people sitting several metres away.
Question. What produces more severe burns, boiling water or steam?
Answer : Steam at 1 00 ·c will produce more severe burns as extra heat is hidden in it called latent heat whereas the boiling water does not have this hidden heat.
Please click the below link to access CBSE Class 9 Chemistry Worksheet - Matter in Our Sorrounding
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