# Chemistry Pre-Lab Questions

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Leticia Glass Introduction to Chemistry Lab 5 Pre-lab Questions 1. In terms of food, what is a calorie? In terms of food, calories are the measurements of how much energy that particular food contains. 2. A piece of chocolate chunk cookie was tested the same way as is used in this procedure. The cookie sample had a mass of 0.851 g and the temperature of a 100.0 mL of water increased by 7.87 ⁰C. How many Calories per gram did the cookie contain? Show all calculations. First of all, the mass of water will equal the density of water times the volume of water used. 1.00 g/mL&100.0mL > Mass of water= 100g E=100.0g*1cal/g*C ° *787 °C=787 Cal So then, calories/g=787/0.851g=925cal/g Calories/g=925/g*1cal/1000cal=0.925 So the cookie contained: 0.925 cal/g Calculations…show more content…
How might you alter the experiment to allow for a more accurate transfer of heat between the burning sample and the calorimeter water? I would alter the experiment for a more accurate transfer of heat between the burning sample and the calorimeter water, would be to have the experiment in a more confined area, so heat isn’t loss. Informal Lab Report: Introduction: Calorie is the amount of energy it will take to raise the temperature of a gram of water by one degree. A calorie is the measurements of how much energy that particular food contains. The equation that will be used is E = mcΔT. E will stand for energy measured in calories. M is the mass of the headed substance in grams and ΔT is the change in temperature. I used four different foods to see the different calories and the hotter the temperature got. Hypothesis: If I experiment different junk foods in the same amount of water mass and volume wise, then I would be able to see the difference in calories between the different foods. Materials: Cheetos Marshmallows Biscuits Almonds Thermometer Butane Lighter Aluminum Can Tab Aluminum Foil 2 Large Paper Clips 250 mL Beaker Scale 100 mL Graduated Cylinder Distilled Water Tripod