Thermochemistry Study of heat in chemical reactions. Heat will travel between a system and its surroundings Heat is measured in Joules (J) Metric  English:

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Presentation transcript:

Thermochemistry Study of heat in chemical reactions. Heat will travel between a system and its surroundings Heat is measured in Joules (J) Metric  English: BTU (British Thermal Unit) 1 BTU = 1.06 kJ

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Calculating Heat The heat that transfers between substances can be calculated with the following equation: q = (s) (m) (∆T)

Calculating Heat q : amount of heat (energy) transferred s: specific heat m: mass (use density to change from mL to g!) ∆T: change in temperature

Calculating Heat Specific Heat is the quantity of heat needed to raise one gram of a substance 1.0 ⁰C. Each specific substance has its own specific heat. (pg. 394)

[ Round to 4.18

Calculating Heat Example: How much heat is needed to warm a mL cup of coffee (H 2 O) from 20.0 ⁰C to 75.0 ⁰C?

Calculating Heat J, but only 3 significant digits so… x 10 4 J or 46.0 kJ

Calculating Heat What is the specific heat of lead? °C 20.0 °C 28.8 °C

1 st Step - Calculate “q” for the H 2 O q = 1840 J 20.0 °C

2 nd Step - Calculate “s” for Lead °C q = (150.0 g)(s)(71.2 o C) 1840 J Energy that water absorbed in step one was supplied by the metal! s = J/(g x C) for Lead