Joshua uses his thermometer and finds the boiling point of ethyl alcohol to be 65° C. He looks in a...

1. Joshua uses his thermometer and finds the boiling point of ethyl alcohol to be 65° C. He looks in a reference book and finds that the actual boiling point of ethyl alcohol is 80°C. What is his percent error?
2. Ariel weighed an object on her balance and recorded a mass of 24.3 grams. Her teacher told her that there was obviously something wrong with her balance because it was giving her a reading which should have been 22.3. What is her percent error?
3. Chase got a lab report back with had determined the boiling point of an unknown liquid to be 45° C. His teacher told him the boiling point should have been 65 degrees C. What is his percent error?
4. The density of water at 4°C is known to be 1.00 g/mL. Kayla experimentally found the density of water to be 1.75 g/mL. What is her percent error?
5. The Handbook of Chemistry and Physics lists the density of a certain liquid to be 0.8988 g/mL. Taylor experimentally finds this liquid to have a density of 0.7925 g/mL. The teacher allows up to +/- 0.500% error to make an “A” on the lab. Did Fred make an “A”? Prove your answer.