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Chemistry SE
| Question | Answer |
|---|---|
| 1. Which of the following particle diagrams correctly represents the states of matter that exist at points A and B on the phase diagram? | C |
| 2. Which of the following particle diagrams correctly represents the states of matter that exist at points A and B on the phase diagram? | 990 J |
| 3. A previously evacuated sealed container is filled with propane gas at a pressure of 6 atm and a temperature of 303 K. A student draws a particle diagram, as shown in the figure, to model the arrangement of the gas particles... (too long). | C |
| 4. The figure represents a solid block of copper metal in a beaker at 30°C . Which of the following best represents the particle arrangement as a student tips the beaker, which is kept at 30°C ? | C |
| 5. Each of three containers contains a solid, a liquid, or a gas substance. One particle of each is represented in the diagrams. Based on the movement of the particles, which of the answers matches the diagrams? | liquid, gas, solid |
| 6. A student fills two syringes: one with air and the other with an equal volume of water... (too long)...best explains the student’s observations that the volume of the gas decreases greatly but the volume of the liquid does not change noticeably? | Gases are more readily compressed than liquids are because there is more space between the particles in a gas than in a liquid. |
| 7.The particle diagram represents a sample of helium in a sealed container at constant volume. Which particle diagram represents the same sample after heating, and what is the correct justification for that choice? | Diagram Y represents the gas sample at a higher temperature because the particles have a higher average speed when heated. |
| 8. A student has drawn this model and says it shows what happens when a liquid changes to a gas. The diagram can best be used to illustrate which of the following? | The density of a gas is less than that of a liquid. |
| 9. Which of the following explains the observation that, for the same substance, the density of a gas is much less than the density of a solid? | The average distance between particles in a gas is larger than the average distance between particles in a solid. |
| 10. The diagrams show two forms of the same substance, form X and form Z , that differ in the arrangement of their particles. Which of the following statements about the relative densities of the two forms is correct? | Form Z is more dense because the mass of form Z is greater than the mass of the same volume of form X . |
| 11. Chromium metal has a density of 7.2 g/cm^3 . Mass and volume data for five metals are given in the table. Which TWO of the metals have a density greater than that of chromium? | Copper and Iron |
| 12. A student determines the mass and volume of several pieces of the same metal...(too long)...The student plots the data, as shown on the graph. The density of the metal is closest to which of the following? | 2.7 g/mL |
| 13. A student determines the mass and volume of several pieces of the same metal...(too long)...Which of the following pieces of glassware should the student use to determine the volume of the metal samples? | B |
| 14. A student creates the following particulate view of the water particles in a tank used for the classroom frogs...(too long)... Which of the following best represents the distribution of water particles in the tank after the increase in temperature? | C |
| 15. When taking care of the frogs, the student adds more water to the tank. A view of the amount of water measured is shown. What should the student record as the amount of water added to the tank, to the appropriate precision? | 43.0 mL |
| 16. Which model represents a low-humidity environment. | Option 1 |
| 17. Which of the following statements correctly identifies the energy transfer that takes place as the change represented by the model occurs? | The process is endothermic; energy is added to the system as the change occurs. |
| 18. Water has a higher boiling point than acetone does. Which of the following statements about water and acetone in the liquid state must be true? | The attractions between particles in water are greater than those in acetone. |
| 19. The figure represents a sample of a pure substance in a beaker. Which of the following changes to the figure would indicate that the boiling point has just been reached? | Formation of water vapor bubbles in the liquid phase |
| 20. A pure substance is represented in heating curve shown in the image. On the following heating curve for the substance, choose the letter or letters that represent the pure substance going through a phase change. | B and D |
| 21, Based on the information in the table, how much heat is needed to melt 10g of ethanol? | 1kJ |
| 22. The model shows the same number of gas particles in two sealed containers at the same temperature. Each rectangle represents the same volume. Which TWO individual changes to the model would each make the pressure in container 1 and container 2 equal? | Adding twelve additional gas particles to container 2 and Decreasing the size of container 2 to 1/4 of its original volume |
| 23. A student is asked to model gas pressure using two walls and a ball connected to a string, as shown....(too long)...How should the student change the setup to show an increase in pressure caused by an increase in temperature? | Swing the ball more quickly so it hits the walls more frequently. |
| 24. The volume of a sample of gas is varied but the sample is kept at a constant temperature.,,(too long)...Which trial is not consistent with the quantitative relationship between macroscopic properties of gases? | Trial 3 |
| 25. A sample of a gas in a 4L container at 300K has a pressure of 1atm . If the temperature is increased to 600K and the volume is decreased to 2L , the pressure is likely to be closest to which of the following? | 4 atm |
| 26.Small pieces of copper at 100.0°C are placed in 110.0g of water at 25.0°C in a perfectly insulated calorimeter...(too long)...Which of the following statements about thermal energy transfer in the experiment is correct? | The temperature of the copper decreases, so thermal energy must flow from the copper to the water. |
| 27. Small pieces of copper at 100.0°C are placed in 110.0g of water at 25.0°C in a perfectly insulated calorimeter...(too long)... The heat capacity of water is 4.18J/(g⋅°C) . How much heat is transferred during the experiment? | 920 J |
| 28. Small pieces of copper at 100.0°C are placed in 110.0g of water at 25.0°C in a perfectly insulated calorimeter...(too long)...Select the correct phrase from the choices below to construct a claim regarding the new experiment. | In the new experiment, the temperature change of the water will be the same as that of the first experiment, because the copper cube is made of the same material and has a mass equal to the copper pieces. |
| 29. A model of hydrazine, N2H4 is shown in the figure. Which modification to the model would make it more complete? | Add an unshared pair of electrons to each nitrogen atom in the structure. |
| 30. A student designs an experiment to determine the identity of three unknown compounds...(too long)...Which THREE of the following claims can be supported using the data? | Y is a covalent compound since it does not conduct electricity in solution. Y is a polar covalent compound since it dissolves in water. Z is a nonpolar covalent compound since it is not soluble in water. |
| 31. The diagram represents a sample that contains atoms of two different elements. Which of the following best describes the sample? | It is a mixture of two elements. |
| 32. The diagram represents a gaseous sample of matter in a sealed container. Each circle of a different shade represents a different type of atom. Which of the following best describes the particle diagram? | It represents one compound mixed together with three different elements. |
| 33. Consider the models shown. Choose the phrase that best describes each model respectively. | atom and molecule |
| 34. During a demonstration, a teacher makes a mixture by combining 40mL of methanol and 60mL of water, as shown...(too long)...Based on the particle diagram, what will be observed? | Methanol and water molecules will not form layers. |
| 35. A solution is made by dissolving solid sucrose in water. The solution is heated gently until all of the water evaporates. The following data are collected. Which of the following can be concluded from the results of the experiment? | The solution contained 81.07g of water. |
| 36. A student claims that intermolecular forces are overcome when water boils, but intramolecular forces are not. Which of the following particle diagrams can be used to support the claim? | Option 4 |
| 37. Molecules of hydrogen chloride (HCl) are shown in diagram X and diagram Y . Which of the following describes which diagram shows attractive forces, and why? | Diagram X , because the dashed lines show that the positive end of one molecule is attracted to the negative end of an adjacent molecule. |
| 38. Which of the following diagrams shows a hydrogen bond circled? | D |
| 39. The Lewis diagrams of CH4 and CH3OH are shown. Which of the following statements about intermolecular forces in CH4(l) and CH3OH(l) best explains the fact that the boiling point of CH3OH(l) is higher than that of CH4(l) ? | CH3OH(l) can form hydrogen bonds, but CH4(l) cannot. |
| 40. Which of the following best explains the difference in the solubility in water of the alcohols listed in the table? | As the size of the nonpolar portion of the alcohol increases, the solubility in water decreases. |
| 41. Part of the periodic table is shown. Click on the element you would predict to have the lowest electronegativity. | Al |
| 42. A chemist uses distillation to remove some methanol from a mixture of equal parts methanol and water...(too long)...Which of the following explains the composition of the gas? | The intermolecular forces between methanol molecules are weaker than those between water molecules, so methanol has a lower boiling point than water has. |
| 43. A chemist uses distillation to remove..(too long)...If the total pressure of the gas sample is 1.0atm , the partial pressure of H2O(g) in the gas sample produced is predicted to be closest to which of the following? | 0.10 atm |
| 44. Which of the following is the complete Lewis diagram of NF3 ? | Option 3 |
| 45. The Lewis diagram of ethanol, an alcohol, is shown. Is this a polar or non polar molecule. | Polar |
| 46. Based on the molecular structures of chloromethane and methane shown, a student makes the claim that a pure sample of chloromethane has stronger...(too long)...Which of the following statements correctly uses reasoning to support the student’s claim? | Chloromethane has a polar C–Cl bond, which allows for dipole-dipole interactions, but methane is nonpolar and only experiences dispersion forces. |
| 47. A student claims that the molecule represented in the diagram is nonpolar, so the substance has only London dispersion forces. Which of the following is the best evaluation of the student’s claim? | The claim is incorrect; the geometry is tetrahedral and there are two different types of atoms around the C atom, so the dipoles do not cancel. |
| 48. Some information about a compound is given in the table. A student claims that it is a covalent compound. Which property best supports the student’s claim? | Boiling point |
| 49. A student performs tests on two compounds to help determine whether they have ionic or covalent bonding. The results are shown in the table. The results support which of the following statements about the compounds? | Compound X is covalent, and compound Z is ionic. |
| 50. Scientists observe that the attractions between the ions in LiF are weaker than those in CaO...(too long)...best explanation for the weaker forces of attraction in LiF compared with those in CaO is that the lithium and fluoride ions in LiF | have a lower ionic charge than the ions in CaO have |
| 51. Which of the following best represents the most common structure of solid sodium fluoride ( NaF )? | Option 1 |
| 52. Which of the following particle diagrams best represents the compound sulfur dioxide ( SO2 )? | Option 3 |
| 53. Identify the molecular geometry around the carbon atoms in compound A labeled 1 and 2 by matching the correct molecular geometry with each labeled carbon atom. | trigonal planar and tetrahedral |
| 54. Consider the following Lewis diagrams of three hydrocarbons. Identify which compounds are structural isomers. | B and C |
Created by:
Alynna