# Heat and Energy - cbafaculty.org

3.6 Specific Heat The high specific heat of water keeps temperature more moderate in summer and winter. Learning Goal Use specific heat to calculate heat loss or gain. General, Organic, and Biological Chemistry: Structures of Life, 5/e Karen C. Timberlake 2016 Pearson Education, Inc.

Specific Heat Specific heat (SH) is different for different substances. is the amount of heat that raises the temperature of exactly 1 g of a substance by exactly 1 C. has units of J/g C in the SI system and units of cal/g C in the metric system. General, Organic, and Biological Chemistry: Structures of Life, 5/e Karen C. Timberlake

2016 Pearson Education, Inc. Specific Heats of Some Substances General, Organic, and Biological Chemistry: Structures of Life, 5/e Karen C. Timberlake 2016 Pearson Education, Inc. Study Check 1. When ocean water cools, the surrounding air A. cools.

B. warms. C. stays the same. 2. Sand in the desert is hot in the day and cool at night. Sand must have a A. high specific heat. B. low specific heat. General, Organic, and Biological Chemistry: Structures of Life, 5/e Karen C. Timberlake 2016 Pearson Education, Inc. Solution 1. When ocean water cools, the surrounding air

B. warms. 2. Sand in the desert is hot in the day and cool at night. Sand must have a B. low specific heat. General, Organic, and Biological Chemistry: Structures of Life, 5/e Karen C. Timberlake 2016 Pearson Education, Inc. Calculations Using Specific Heat When we know the specific heat of a substance, we can calculate the heat lost or gained, by measuring its mass

and temperature change. write a heat equation. Core Chemistry Skill Using the Heat Equation General, Organic, and Biological Chemistry: Structures of Life, 5/e Karen C. Timberlake 2016 Pearson Education, Inc. Guide to Calculations Using Specific Heat General, Organic, and Biological Chemistry: Structures of Life, 5/e Karen C. Timberlake

2016 Pearson Education, Inc. Study Check What is the specific heat if 24.8 g of a metal absorbs 275 J of energy and the temperature rises from 20.2 C to 24.5 C? General, Organic, and Biological Chemistry: Structures of Life, 5/e Karen C. Timberlake 2016 Pearson Education, Inc. Solution

What is the specific heat if 24.8 g of a metal absorbs 275 J of energy and the temperature rises from 20.2 C to 24.5 C? STEP 1 State given and needed quantities. ANALYZE Given Need THE PROBLEM 24.8 g metal 275 J energy Tinitial = 20.2 C Tfinal = 24.5 C specific heat

STEP 2 Calculate the temperature change (T) . T = 24.5 C 20.2 C = 4.3 C General, Organic, and Biological Chemistry: Structures of Life, 5/e Karen C. Timberlake 2016 Pearson Education, Inc. Solution What is the specific heat if 24.8 g of a metal absorbs 275 J of energy and the temperature rises from 20.2 C to 24.5 C? STEP 3 Write the heat equation. Heat = m T SH

STEP 4 Substitute in the given values and calculate the heat, making sure units cancel. General, Organic, and Biological Chemistry: Structures of Life, 5/e Karen C. Timberlake 2016 Pearson Education, Inc.

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