(a) To identify a liquid substance, a student determined its density. Using a graduated cylinder, she measured out a 45-mL sample of the substance. She then measured the mass of the sample, finding that it weighed 38.5 g. She knew that the substance had to be either isopropyl alcohol (density 0.785 g/mL) or toluene (density 0.866 g>mL) . What are the calculated density and the probable identity of the substance? (b) An experiment requires 45.0 g of ethylene glycol, a liquid whose density is 1.114 g/mL. Rather than weigh the sample on a balance, a chemist chooses to dispense the liquid using a graduated cylinder. What volume of the liquid should he use? (c) A cubic piece of metal measures 5.00 cm on each edge. If the metal is nickel, whose density is 8.90 g/cm3, what is the mass of the cube?
The effect of Light Intensity and Wavelength on the Rate of Photosynthesis James Gruver (Partner: Rob Cooper) 24 March 24, 2015 Objectives/ Hypothesis: The purpose of our experiment was to see if photosynthesis is an on/off type of phenomenon in which the reaction proceeds at a fixed rate regardless the intensity or amount of light, or does the rate of reaction vary with the intensity of light. So with this experiment we are going to determine where light intensity has an effect on the rate of photosynthesis. Since oxygen is a byproduct of the reaction we can measure the rate of the reaction by measuring the production of oxygen. Our hypothesis going into the experiment is that the rate of photosynthesis increases with