Maths Group11

English Modal verb questions! https://youtube.com/watch?v=diCZecGBfKo&si=JJJOlucnzxQOu8rS

Dear our members, this pdf is the above questions. If you want, you can always use it.

22. Which of the following is an endothermic process? A) Melting B) Freezing C) Condensation D) Sublimation 23. Which of the following is an exothermic process? A) Melting B) Freezing C) Condensation D) Evaporation 24. The enthalpy of vaporization is the amount of energy required to: A) Convert 1 mole of a liquid into a gas B) Convert 1 mole of a solid into a liquid C) Convert 1 mole of a gas into a liquid D) Convert 1 mole of a liquid into a solid 25. A mixture of 10.0 g of sodium chloride and 50.0 g of water has a volume of 60.0 mL. What is the density of the mixture. A) 1.33 g/mL B) 0.75 g/mL C) 1.75 g/mL D) 1.00 g/mL 26. A solution containing 2.00 mol of glucose (C6H12O6) is dissolved in 100.0 mL of water. What is the molarity of the solution. A) 0.200 M B) 2.00 M C) 10.0 M D) 0.100 M 27. A gas mixture contains 2.00 mol of nitrogen (N2), 1.00 mol of oxygen (O2), and 0.50 mol of carbon dioxide (CO2). What is the partial pressure of nitrogen in the mixture. A) 0.50 atm B) 1.00 atm C) 1.50 atm D) 2.00 atm 28. The average kinetic energy of gas molecules is directly proportional to: A) The number of moles of the gas B) The volume occupied by the gas C) The absolute temperature of the gas D) The total pressure of the gas 29. Which of the following statements is true regarding solids, liquids, and gases? A) Solids have a definite shape and volume, while liquids have a definite volume but no definite shape, and gases have neither definite shape nor volume. B) Solids, liquids, and gases all have a definite shape and volume. C) Gases have a definite shape and volume, while solids and liquids do not. D) Liquids have a definite shape, but solids and gases do not. 30. What happens to the particles in a substance when it transitions from a solid to a liquid? A) The particles move closer together and become more ordered. B) The particles gain energy, move apart, and become less ordered. C) The particles lose energy and become more tightly packed. D) The particles remain stationary and do not change. THE END Prepared by Maths group11.

Chemistry questions for grade 11 -12 students from grade 9 unit 5 and grade 11 unit 3 physics states of matter. Choose the best answer 1. What is the density of a substance if 50 grams occupies a volume of 25 cm³?    A) 0.5 g/cm³     B) 1.0 g/cm³     C) 2.0 g/cm³     D) 5.0 g/cm³  2. A gas occupies a volume of 2.0 L at a pressure of 1.0 atm. What will be its volume if the pressure is increased to 2.0 atm (at constant temperature)?    A) 1.0 L     B) 2.0 L     C) 3.0 L     D) 4.0 L  3. Which one of the following matter have definite volume, but have no definite shape? A) Solids B) Gases C) Plasma D) Liquids 4. What is the volume of 1 mole of an ideal gas at standard temperature and pressure (STP)?    A) 22.4 L     B) 24.0 L     C) 18.0 L     D) 1.0 L  5. A gas has a volume of 3.0 L at a temperature of 300 K. What will be its temperature if the volume is reduced to 1.5 L (at constant pressure)?    A) 150 K     B) 200 K     C) 300 K     D) 600 K  6. When ice melts at 0°C, how much heat is absorbed by 200 g of ice? (Heat of fusion for ice = 334 J/g)    A) 6680 J     B) 6670 J     C) 1670 J     D) 334 J  7. If you have a balloon filled with gas at a pressure of 1.5 atm and a volume of 4.0 L, what will the new volume be if the pressure is reduced to 1.0 atm (temperature constant)?    A) 2.67 L     B) 4.5 L     C) 6.0 L     D) 8.0 L  8. A container holds 2 moles of gas at a temperature of 300 K and a pressure of 1 atm. What is the volume of the gas?    A) 49.4 L     B) 61.2 L     C) 73.2 L     D) 82.1 L  9. What is the final temperature if you start with a gas at 400 K and increase its volume from 2 L to 4 L while keeping pressure constant?    A) 200 K     B) 400 K     C) 600 K     D) 800 K  10. Which of the following matter have higher density than the others? A) Solid B) Liquid C) Gases D) Plasma 11. If the boiling point of a liquid is at standard atmospheric pressure (1 atm), what happens to its boiling point if the pressure is decreased to half an atm?     A) It increases      B) It decreases      C) It remains the same      D) It becomes unpredictable  12. A sample of gas has a volume of 10 L at a temperature of -20°C. What will be its volume at standard temperature (0°C), assuming constant pressure?     A) 9.7 L      B) 10 L      C) 10.2 L      D) 11 L  13. A gas is compressed from a volume of 5 L to a volume of 2 L at constant temperature. If the initial pressure was 3 atm, what is the final pressure?     A) 7.5 atm      B) 6 atm      C) 4 atm      D) 1.5 atm  14. Which of the following is not the physics properties of gases? A) They are highly compressible. B) They exert pressure equally in all directions. C) Gases have much higher density than solids and liquids D) The volume and the shape of gases are not fixed   15. Which of the following is equal to 1000cm³? A) 10dm³ B) 100mL C) 1L D) 1m³  16. A balloon filled with helium has a volume of 10 L at room temperature (25°C). If it is cooled to -10°C, what will be its new volume? (Assuming ideal behavior and constant pressure) A) Approximately 8.5 L B) Approximately 9 L C) Approximately 10 L D) Approximately 11 L 17. Volume is: A) Inversely proportional to temperature B) Directly proportional to pressure C) Increased when the temperature is decreased D) Increased when the pressure is decreased 18. At what temperature will the volume of gas be doubled, if the original temperature is 17°C? A) 580K B) 1060K C) 145K D) 273K 19. If an unknown gas diffuses 1.73 times faster than krypton, what is the molar mass of the unknown gas? (Molar mass of krypton= 83. 8g/mol) A) 28g/mol B) 63.7g/mol C) 110g/mol D) 251g/mol 20. The direct change of gas to solid is: A) Sublimation B) Deposition C) Evaporation D) Condensation 21. If you have two gases in a closed container and one gas diffuses faster than the other, which law explains this phenomenon? A) Boyle's Law B) Charles' Law C) Graham's Law D) Dalton's Law

Dear our members, we have prepared chemistry some questions from grade 11 unit-3 and grade 9-5 about physical states of matter. How do you wait it?