Kinetic Particle Theory - Test

Kinetic Particle Theory – Question Bank MCQs [Q] The diagram represents a closed vessel containing equal volumes of water and steam at 100°C and atmospheric pressure. Which of the following statements is correct? A Equal number of molecules are present in the steam and in the water B The only type of movement possible for molecules in the water is vibration C Some of the molecules in the steam split into hydrogen and oxygen molecules D Molecules can move from the water into the steam and from the steam into the water [Q] A sample of a pure compound is heated until it is completely molten and the compound is then allowed to cool until it is completely solid again. The graph shows how the temperature of the compound changes with time. When are liquid and solid both present? A P to Q and R to S B P to Q C Q to R D R to S [Q] The table gives data about four substances. Which substance has particles in a disorderly arrangement at room temperature? [Q] The cover plates were removed from the gas jars shown in the diagram. After several days, the colour of the gas was the same in both jars (as shown). Cover-plate After several days of removing the plates Which statement explains this change? A Oxygen and bromine gases have equal densities. B Oxygen and bromine molecules are in random motion. C Oxygen and bromine molecules diffuse at the same rate. D Equal volumes of oxygen and bromine contain equal number of molecules. [Q] The apparatus shown is set up, using different gases in the beaker. Which gas, when present in the beaker, causes the water level at X to rise? A carbon dioxide, CO2 B chlorine, Cl2 C nitrogen dioxide, NO2 D methane, CH4 [Q] Which of the following correctly describes the particles in a dilute sugar solution at room temperature? Sugar molecules Water molecules A B C D Widely separated, moving at random Widely separated, moving at random Widely separated, not moving Close together, moving at random Close together, moving at random Close together, not moving Widely separated, moving at random Close together, moving at random  [Q] The table shows the melting and boiling points of four substances. At room temperature which substance is a liquid and rapidly evaporates if left exposed to the air? Substance Melting points (°C) Boiling points (°C) A B C D -100 -7 -6 44 -35 58 225 280 [Q] In which conversion do H2O molecules lose speed? A ice → water B ice → steam C steam → ice D water → steam [Q] At which temperature does a concentrated aqueous solution of sodium chloride begin to boil? A 96°C B 99°C C 100°C D 104°C [Q] A sample of a pure compound is heated until it is completely molten and the compound is then allowed to cool until it is completely solid again. The graph shows how the temperature of the compound changes with time. When are liquid and solid both present? A P to Q and R to S B P to Q C Q to R D R to S Structured Questions [Q] Complete the following tables: Property Solid Liquid Gas - P a r t i c l e s - Packing Further apart Forces of attraction Strong - not tightly held Very weak - free to move Arrangement Regular rows Random Motion Moving about Diagrammatic representation Shape Irregular   Volume     Take on the volume of the container Compressibility Easily compressible Density High Ease of flow Do not flow     Change of State Process Solid to Liquid Boiling Gas to Liquid Liquid to Solid Sublimation Gas to Solid [Q] (a) The diagram represents the arrangement of particles in a solid. Describe the movement of the particles in the solid. How does this movement alter as the temperature of the solid is increased? How does this movement alter as the solid melts? Samples of the gases carbon dioxide, Mr = 44 and hydrogen, Mr = 2 are at the same temperature. Compare the speeds of the molecules in these two gases. Equal masses of steam and water contain the same number of molecules. Explain why the volume of the steam is much greater than that of water. [Q] The graph below shows the heating curve for a pure substance. What is the melting point of the substance? What happens to the temperature while the substance changes state? Explain. Explain why the substance cannot be water. [Q] Use the substances named in the table to answer the following questions. (a) (i) Name a monatomic gas. (ii) Which substances are liquids at –187 °C? (iii) Name the substance which is a liquid over the largest range of temperature. Box A represents the arrangement of particles in carbon dioxide at –79 °C. (iv) Draw a diagram in box B to show the arrangement of particles in carbon dioxide at –77 °C. The percentage amounts of the same gases were measured in air from a crowded classroom. (b) (i) Name one gas whose percentage is higher in air from a crowded classroom. (ii) Name one gas whose percentage is lower in air from a crowded classroom. steam water