Transcript Calories

Calories
Application of energy
Combustion Reactions
• A chemical reaction that has oxygen as a reactant.
• Is this exothermic or endothermic?
• Is cellular respiration a combustion reaction?
• How can we measure aerobic respiration?
How else can we measure it?
• Energy: the capacity to do work
• Calorie: a unit that measures energy
• Heat energy required to raise the temperature of
one gram of water by one degrees Celsius
• Calorie = kilocalorie: heat energy required to raise
the temperature of one kilogram (1000 grams) by
one degrees of Celsius
Food Items that “have Calories”
• Carbohydrates- provide energy (4 cal/gram)
• Fats & Oils- provide energy (9 cal/ gram)
• Proteins- provide energy (4 cal/ gram)
• Vitamins- CANNOT provide energy
• Minerals- CANNOT provide energy
• Water- CANNOT provide energy
Energy Provided by Food
• Carbohydrates- provide energy (4 cal/gram)
• Fats- provide energy (9 cal/ gram)
• Proteins- provide energy (4 cal/ gram)
• Calorie: energy required to raise 1g of water 1oC
• Which has the most calories per serving?
Calorimetry Lab.
NO TOLERANCE POLICY
1. Did you write down the mass of food and crucible?
2. Did you write down the initial temperature of
water?
Now you are ready to burn food.
1. Did you dump out the water, empty food remnants
and clean off can and crucible?
2. Proceed back to step 1.
Food usage in your body
• Food “has calories” ie. food has energy
• Bonds are broken from carbohydrates, fats/ oils and
proteins.
• “doing nothing” requires energy- to breathe, pump
blood, blink, swallow, etc.
• “doing nothing” = resting metabolic rate
• Technically basal metabolic rate
Metabolic Rates
• Basal Metabolic Rate = “doing nothing”
• Resting Metabolic Rate = your body is constantly
building things and breaking down things
• Both REQUIRE ENERGY (ATP)
• What does this have to do with weight gain and loss?
Weight
Gain
Loss
• Eat more, exercise less
• Eat less, exercise more
• More Calories and less
exercise = use ______ ATP
to maintain daily activities
• Less Calories and more
exercise = ______ ATP to
maintain daily activities
• Body is working less hard
so will store excess energy
as starch (glycogen) or fat to
make ATP later when
needed
• Body is working harder so
will use need more energy
and will use starch storage
and perhaps fat to convert
to ATP
Summarize past two Weeks
Questions on Calorie WS/
Lab