1. Daily Science April 13 What is STP? Use the reaction shown below to answer the questions:  CO + NO  N 2 + CO 2 Balance the equation If 42.7 g of CO is reacted completely at STP what volume of N 2 gas will be produced?

2. PG. 103 Energy and chemical change

3. Energy The ability to do work Energy is conserved Energy stored in a substance because of its composition- chemical potential energy Most energy is released in heat Heat flows from warmer to cooler; symbol- q

4. Measuring heat Metric system- calorie Calorie- the energy required to raise the temp of 1g of pure water, 1 o C SI unit- joule 1 J = 0.2390 cal 1 cal= 4.184 J

5. Specific heat The amount of energy required to raise the temperature of 1g of that substance by 1 degree C. Unique to a substance, symbol - c Water- 4.184 J/ (g x o C)  gold is only 0.129 Mass and temp affect the heat absorbed and released q = c x m x ΔT

6. Example If the temperature of 34.4 g of ethanol increases from 25.0 o C to 78.8 o C, how much heat has been absorbed by the ethanol (c= 2.44 J/ (g x o C)? A 155 g sample of an unknown substance was heated from 25.0 C to 40.0 C. The substance absorbed 5696 J of energy. What is the specific heat of the substance?