Module Eleven Lesson One Activity

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Rocky Mount High School *

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12

Subject

Chemistry

Date

Nov 24, 2024

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pdf

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2

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Google Doc Access Directions: Please click on File in the upper left corner. If you are working on a Chromebook or Google Docs, choose the Make a copy option and save a copy of the document to your Google Drive. If not, choose the Download as option and then the Microsoft Word (.docx) option to download an editable copy of the document to your computer. Heat and Energy Practice Problems For most of the heat problems, you will use the equation found below: Q = Heat Input/Output (Joules) m = Mass of Substance (grams) c = Specific Heat Capacity (use your Reference Tables to find!) T = Change in Temperature (Kelvin or Celsius) The specific heats for the elements we use will be found in your Chemistry Reference Tables (in rare exceptions they may be given to you or you may need to do a quick web search to find them). The specific heat is also abbreviated C p on your reference tables (page 1). 1. Go to your Reference Tables (page 1) and find the specific heats for water in each phase: a. Solid _________________ b. Liquid _________________ c. Gas _________________ 2. Find the specific heat for the following elements (also on page 1 of the reference table in the table at the bottom): a. Iron _________________ b. Aluminum _________________ c. Gold _________________ Now let’s practice with some simple problems! I have given you some hints in bold to help… 3. Find the amount of heat energy needed to convert 100 grams ( mass ) of ice ( use this information to find the specific heat needed ) from the temperature (-) 25°C to (-) 50°C. 4. Using a calorimeter (a way to measure heat), a scientist determined it required 50 Joules of energy to convert a 25 gram sample of gold ( element name can be used to find the specific heat on the table ) from one temperature to another. What was the temperature change?
5. An unknown 10 gram sample in a lab required 44.9 Joules of energy to change the temperature 10 degrees Celsius . What was the specific heat of this element? Using the specific heat, find the likely element using your Reference Table. Now let’s try few without the hints… 6. Find the amount of heat energy needed to convert 25 grams of steam from 115°C to 160°C. 7. Find the mass of ice that would require 738 joules of energy to move from (-)100 °C to (-)70°C. 8. Find the final temperature if a 10 gram sample of aluminum requires 358.8 Joules of energy and begins at 10 °C before it is heated.
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