Yvette conducted an eperiment investigating the effects of temperature on chemical reaction time. She dropped an Alka Seltzer tablet in water of different temperatures and
measured the time it took for the reaction to complete. She hypothesized that the Alka
Seltzer tablet would react faster in warmer water.

1. Was Yvette's hypothesis correct? Explain your answer.

2. If Yvette dropped an Alka Seltzer tablet in water at 35*C, how long could she expect the reaction to take? Explain your answer.

3. Which reaction time is not consistent with the rest of the data table? What should its value be? What could have caused this inconsistency? Explain your answer.

If a 60-g object has a volume of 30 cm3, what is its density? 2 g/cm3 0.5 cm3/g 1800 g * cm3 none of the above

Electric charge is what ? a. kinetic energy b. radiation c. discovery d. electricity

A3.37-mg sample of protein was chemically digested to convert its nitrogen into ammonia and then diluted to 100.0 ml. then 10.0 ml of this solution was placed in a 50-ml volumetric flask and treated with 5 ml of phenol solution plus 2 ml of sodium hypochlorite solution. the sample was diluted to 50.0 ml, and the absorbance at 625 nm was measured in a 1.00-cm cuvette and found to be 0.486. for reference, a standard solution was prepared from 10.0 mg of nh4cl (molar mass = 53.49 grams/mole) dissolved in 1.00 l of water. then 10.0 ml of this standard was placed in a 50-ml volumetric flask, treated in the same manner as the unknown, and the absorbance found to be 0.323. finally, a reagent blank was prepared using distilled water in place of unknown, it was treated in the same manner as the unknown, and the absorbance found to be 0.076. calculate the weight percent of nitrogen in the protein.