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CHM lab 5 and 7
| Question | Answer |
|---|---|
| what is the difference between a calorie (c) and a Calorie (C)? | 1 Calorie (food Calorie) = 1,000 calories |
| how many Calories per gram do proteins and carbs provide? | 4 kcal/g each |
| how many Calories per gram do fats provide? | 9 kcal/g |
| what does the calorimeter measure? | heat when food burns, transferred into water |
| what does triangle T mean? | change in water temp |
| how do you find the mass of food burned? | mass before burning- mass after burning |
| how do you calculate Calories per gram? | Calories released divided by grams of food burned |
| why cant you relight a food if the flame goes out? | because the water is already warmer |
| why must the soot be cleaned off the flask before each run? | soot blocks heat transfer |
| what is a functional group? | reactive group of atoms that give molecule its behavior |
| what functional group do alkanes have? | none |
| what functional group do alkenes have? | double bond (vinyl group) |
| what functional group do alcohols have? | an OH (hydroxyl group) |
| what functional group do ketones have? | a carbonyl group |
| what region is the OH stretch found in? | around 3500 cm-1 |
| what region is the vinyl C-H stretch found in? | just above 3000 cm-1 |
| what region is the carbonyl (C=O) stretch found in? | approximately 1700 cm-1 |
| what is the fingerprint region? | 1500-500 cm-1 |
| if you see a strong peak at 3500 cm-1 what is the compound likely to be? | an alcohol |
| if no OH and C=O peaks are present, but you only see saturated CHs, what class is likely? | an alkane |
| what does the IR spectrometer measure? | which frequencies of IR light are absorbed by the molecule |
| what does the peak in an IR spectrum mean? | molecule absorbed IR, a vibration occured |
| what does transmittance mean on an IR spectrum? | how much IR passes through the sample |
Created by:
Riley06
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