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 surroundings (1)
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Ch-1. Matter in our surroundings:-
Q1. What Property of butane is utilized when it is supplied as L.P.G.?
Q2. Describe an activity to show that particles of matter are continuously moving.
Q3. What produces more severe burns, boiling water or steam? Explain Why?
Q4. Which of the followings diffuses faster:
Honey, Sugar, Nitrogen gas
Q5. Differentiate between Dry ice and ice.
Q6. Define sublimation with example.
Q7.You are provided with a mixture of naphthalene and ammonium chloride by your
teacher. Suggest an activity to separate them with a well labeled diagram.
Q8.It is hot summer day. Priyanshi and Ali are wearing cotton and nylon clothes
respectively .Which one do you think would be more comfortable and why?
Q9.Why does the temperature of a substance remain constant during its melting point
or boiling point?
Ch-2. Is matter around us pure?
Q10. How will you separate butter from milk?
Q11. Classify the followings into true solution, colloidal solution and suspension.
Blood, Milk, Toothpaste, Salt Solution, Muddy Water
Q12.Define solubility. What are the factors which effect solubility of solid in liquid
and solubility of gas in liquid?
Q13. Differentiate between distillation and fractional distillation.
Q14.Smoke and fog both are aerosols. In what way are they different?
Q15.What are the favorable qualities given to gold when it is alloyed with copper or
silver for the purpose of making ornaments?
Q16.An element is sonorous and highly ductile .Under which category would you
classify this element? What other characteristics do you expect the element to posses?
Q17.Give some examples of tyndall effect observed in your surroundings?
Exam Questions NCERT Class 9 Science Chapter 1 Matter in Our Surroundings
Question Write the SI unit of temperature?
Ans : Kelvin.
Question. Why is Kelvin scale of temperature regarded as better scale than Celsius?
Ans : As it has wide range of measurement and Kelvin scale of temperature has always positive sign, hence regarded as better scale than Celsius. Kelvin is an absolute thermodynamics scale, which uses its null point as the temperature at which all thermal motion ceases to exist.
Question. What is compressibility? How it is negligible in solids?
Ans : Compressibility is the ability of a substance to be reduced to its volume under pressure. Solids are incompressible as their particles are held together. So, we can tell that compressibility is negligible in solids.
Question. Two cubes of ice are pressed hard between two palms and after releasing the pressure, the cubes join together. Why?
Ans : Pressure is directly proportional to temperature when we apply pressure, temperature increases then the ice in contact melts and it turns into water. When pressure is removed, the temperature decreases again and melted ice again freezes. Hence, cubes join together.
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Question Convert 10°C into Kelvin scale.
Ans : 273 + 10 = 283 K
Question. Does solid ice and liquid water co-exist together? If yes, then at what temperature?
Ans : At 0°C, the three phases of water co-exist called triple point.
Question What is the reason that “Ice has lower density than water”?
Ans : The mass per unit volume of a substance is called density (density = mass/volume). The density of substance decreases as the volume of a substance increases. Space between particles increases when water changes into ice. These spaces are larger as compared to the spaces present between the particles of water. Thus, the volume of ice become greater
as compared to the water. Hence, the density of ice ecome lower than that of water. And, a substance with lower density than water can float on water. Thus, ice floats on water.
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