Science
Chemistry Compounds Phases Concentration and Phase Changes Questions

Question Description

I’m studying for my Chemistry class and need an explanation.

Write answers by hand and follow directions on document attached. For the first part answer it so it would be in the expanding category. For parts 2 and 3 do all of the calculations.

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Test Review: Phases, Phase Changes, and Concentration Chemistry Name: _________________________________ Part 1: Concepts Use a combination of words and diagrams to explain how solids, liquids, and gases are different from each other and how the movement of their particles changes with energy changes. A proficient response should include how the particles move in each phase of matter, information about kinetic and potential energy changes, and name the phase changes. An expanding response could include some of the following: how intermolecular forces and molar mass help determine what phase a substance will be at room temperature (with specific examples), other phases of matter outside the typical three (as well as their properties), Beginning Developing Proficient Expanding At least some correct and relevant information about the concept is included in the response. The explanation is generally correct but misses at least one main point or does not connect the various points. The response explains the concept fully as it was presented in class. In addition to explaining the concept, the response relates this information to other units, courses, or real-life examples. Part 2: Calculations of Energy Changes in Temperature & Phase Changes Beginning How much energy is required to raise 5.0g of water from 20.0°C to 50.0°C? How much energy is required to change 2.0g of ice to liquid water if the ice is at 0°C? Developing If a metal that has a mass of 5.00g absorbs 6.72J to change temperature from 21.0°C to 24.0°C, what is the specific heat of the metal? If a 15.0g sample at its melting point absorbs 1635J to change from solid to liquid, what is the heat of fusion of the substance? Proficient How much energy would be required to completely boil off 35.0g of water from a pot that starts at 20.5°C? How much energy does a sample of 25.5g of H2O lose as it is placed into a freezer and goes from 19.5°C to -10.0°C? Expanding A 5.00g block of solid ethanol is moved from a freezer that has a temperature of -120.0°C into 100.0g of water at 25.6°C. The final temperature of the water is 20.0°C. What is the heat of fusion of ethanol? Part 3: Concentration Concentration Beginning What information does the concentration of a solution provide? Developing Proficient Expanding If a solution has a volume of 4.2L and has 1.50mol, what is the molarity? If 15.7g of AgNO3 are dissolved into 250mL of water, what is the solutions molarity? How would someone prepare 500.mL of 0.25M NaOH given solid NaOH and water? If a solution is made by dissolving 25.0g of KNO3 into 250g of water, what is the percent solution? If 25.0mL of 15.8M HNO3 are How would someone prepare added to 175.0mL of water, what is 1.50L of 0.25M H2SO4 given 18M the final volume and H2SO4 and water? concentration? Reference H2 O Heat of Fusion = 334J/g Heat of Vaporization = 2260J/g Specific Heat(solid) = 2.108J/g°C Specific Heat(liquid) = 4.186J/g°C Ethanol Specific Heat(solid) = 2.419J/g°C Specific Heat(liquid) = 2.57J/g°C Melting Point = -114.1°C ...
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Final Answer

Hello! Here are parts 2 and 3, I am w...

Bubbel (181)
Rice University

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