CHEM 105-4SDF - Thermochemistry Things to know 1 2 3...

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Thermochemistry Things to know 1. Energy is conserved. Heat is a form of energy. 2. 3. Specific Heat Capacity a. Defined as the amount of energy (in calories) that it takes to heat one gram of substance by one degree Celsius (or Kelvin). b. Expressed in units of c. Will be told to you in the problem, if you need it. i. Water is 4.184 Practice: 1. 10.5 grams of water is heated from 0°C to 45°C. What is the total change in energy for the system? 2. Ethyl Alcohol is chilled in a two-piece aluminum can that can show when it is finally “Rocky Mountain Cold.” The can is initially below freezing, let’s say at -10°C, and then beer (assume beer has the same c
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Unformatted text preview: p as EtOH) at 33°C is poured into the can. What is the final temperature of the beer and the can, and why doesn’t the beer freeze? c pEtOH =2.46 , and c pAl =.900 . 3. Challenge Yourself for Next Time: You stop at Starbucks for a 200g cup of coffee to wake up before coming to SI. You take the first sip and realize that it is really hot, 99.2°C, as your handy pocket thermometer told you. Because you want to drink it all before you get to the session, you add 8.2 g of ice at -3°C to the coffee. What is the final temperature of the coffee? H Δ fus-ice =6.01kJ/mol, c p-ice =2.13 ....
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