Page 150 - Chemistry eBook
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Sample Non-Regents Questions
How much heat energy (in joules) is absorbed when 30 grams of water changes from 20°C to 30°C?
q = 1254 joules
Explanation:
1. Rewrite the formula: 2. Calculate each part:
Answer
a. q=? (we’re trying to figure this out)
b. m = 30 grams
c. c = 4.18 joules (Reffy Table B told me) d. ∆T = 30°C − 20°C = 10°C
3. Plug the numbers into the equation: q = 30 × 4.18 × 10
4.Calculate the answer: q = 1254 joules
We label the answer joules since a joule is the unit that measures heat.
149 © UNIT 5: MATTER
