University:
Dallas College
Course:
CHEM 1405 | Introductory Chemistry I
Academic year:

2023
Views:

175

Pages:

1
Author:

Allie Davidson

CALCULATIONS WITH HEAT ENERGY Joules and calories are the units used to measure heat energy. When heat is emitted or absorbed, the amount of heat transferred is calculated via the following formula. Provide the answers to the questions below. 1. Raising the temperature of 500g of water from 15° C to 30° C would require how many calories to be absorbed by the water? How many joules? Answer: 2. The specific heat of iron = 0 J/g C°. Raising the temperature of 50g of iron from 40° C to 100° C would require how many joules to be absorbed by the iron? How many calories? Answer: 3. What is the specific heat of aluminum if it requires 105 calories to warm 100 g of aluminum from 15° C to 20° C,? Answer: 4. By how much does the temperature of 750 g of water increase if 31, 500 joules of heat are added to it? Answer: 5. If 100g of iron at a temperature of 100° C is placed in 100g of water at 0° C, what would the final temperature be? (use the specific heat of iron from question 2 above) Answer: ∆Q = m x ∆T x C heat = (mass in grams) (change in temperature) (specific heat) The specific heat depends on the material, for example, the specific heat of water is 1 cal/g C° or 4 joules/g C°

Introductory Chemistry I 23 - Worksheet

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