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Published byMoses Ambrose Gilbert Modified over 8 years ago
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Warm-up 2C 8 H 18 + 25 O 2 → 16 CO 2 + 18 H 2 O ΔH = −10,900 kJ
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____ C 3 H 8 + _____ O 2 → ______ CO 2 + _____H 2 O + _____kJ ____ C 4 H 10 +_____ O 2 → ______ CO 2 + _____H 2 O + _____kJ ____ C 8 H 18 +_____ O 2 → ______ CO 2 + _____H 2 O + _____kJ ____ C 10 H 22 +_____ O 2 → ______ CO 2 + _____H 2 O + _____kJ
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What unit do we use to measure energy? How much is one joule? – The energy needed to lift an apple 1 meter. – The energy you release as heat in 1/100 th of a second as you just sit there. – The kinetic energy of a tennis ball moving at 14 mph. – Energy in the sunlight that hits this piece of paper in one second. How do we know energy is given off in the combustion of a hydrocarbon? How could we measure or capture this energy?
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We can capture the heat energy in a pop can with water in it and measure the temperature change of the water. A device that measures the heat of chemical reactions is called a calorimeter. We need to figure out how many joules are released, but the thermometer measures degrees Celsius.
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Can you come up with an equation for this?
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Examples How many joules will it take to raise the temperature of 400 g of water 20 degrees Celsius? How many kilojoules is that? 33.6 kJ
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