8 Chemistry Questions PLEASE help (desperate & multiple choice) 10 points!?

Question 1 (Multiple Choice Worth 3 points)The cooling curve below represents the cooling of a sample of gas. According to the cooling curve, what phase(s) would you expect to observe when the substance is at a temperature of 275 Kelvin? [external link] and liquidliquidliquid and solidsolidQuestion 2 (Multiple Choice Worth 3 points)The heating curve below shows the temperature change that occurs as a solid is heated. What is occurring at segment CD of the graph? [external link] a liquidmelting a solidheating a liquidheating a solidQuestion 3 (Essay Worth 4 points)Use your own words to describe, in terms of particle movement and energy, what occurs when a solid is heated to its melting point.Question 4 (Multiple Choice Worth 3 points)Which of the following expands to fill the container it is in but can be compressed to a smaller volume when pressure is applied?solid ironliquid bromineneon gassugar crystalsQuestion 5 (Multiple Choice Worth 3 points)What is the approximate boiling point of the substance represented by the complete heating curve below? [external link] °C40°C50°C100°CQuestion 6 (Multiple Choice Worth 3 points)A student blows up a balloon, seals it tightly, and places it in a very cold freezer. After a few hours, the balloon has gotten smaller. Which of the following statements best explains the decrease in the balloon’s volume?As the temperature decreases, the molecules gain energy and move closer together, causing the balloon to shrink.As the balloon releases energy, the molecules break apart into atoms, causing the balloon to shrink.As the temperature decreases, the molecules lose energy and move closer together, causing the balloon to shrink.As the balloon absorbs energy, the molecules move more quickly, causing the balloon to shrink.Question 7 (Multiple Choice Worth 3 points)Rubbing alcohol evaporates from your hand quickly, leaving a cooling effect on your skin. Because evaporation is an example of a physical property, how do the molecules of gas compare to the molecules as a liquid?The gas particles have a stronger attraction between them and move slower than the liquid particles.The gas and liquid particles have the same structure and identity but different motion and kinetic energy.The bonds inside the molecule are broken, and atoms move closer together as evaporation occurs.The bonds are broken, and atoms spread apart as the alcohol changes phase from liquid to gas.Question 8 (Multiple Choice Worth 3 points)In which of these samples do the atoms have the least kinetic energy?bromine gas (75°C)bromine gas (60°C)liquid bromine (45°C)liquid bromine (10°C)



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One Response to “8 Chemistry Questions PLEASE help (desperate & multiple choice) 10 points!?”

  1. cloot says:

    1. The curve is flat at 275K, so you know it’s going through a phase change. As there is another phase change at a higher temperature, you know it’s going from a liquid to a solid – so the answer is C, solid and liquid.2. In segment CD it is a liquid rising in temperature, so C – heating a liquid.3. When a solid is heated to it’s melting point, the particles begin to move faster and the amount of Thermal Energy it contains rises. 4. We know that solids have a definite shape that doesn’t change depending on the container – so you know it’s not solid iron or sugar crystals. You know liquids form to the shape of the container, but the volume of it does not change so you know it’s not liquid bromine either – which leaves neon gas. 5. The boiling point would be at Point D – so you can figure it out from there.6. Hot (more temp) = more energy = more movement …. cold (less temp) = less energy = less movement… and no atoms/molecules are created/destroyed or are otherwise changed during temperature changes. You should be able to figure it out from those clues.