Which of the following statements is a hypothesis about the synthesis of gold nanoparticles? (LO 1.1) (a) Adding a salt solution to gold nanoparticles causes the color to change from red to blue. (b) To examine the effect of salt on gold nanoparticles, variable concentrations of salt are added to the nanopar-ticles and the results are measured (c) A solution of gold nanoparticles with an average diam-eter of 30 nm has a wavelength of maximum absorption of 450 nm and is a reddish-orange color. (d) Adding a substance with a negative charge to the surface of the nanoparticles creates repulsive forces that stabilize small particle size

Video transcript

Hi everyone. This problem reads identify the hypothesis among the following statements for an experiment about hexane and water. So we want to identify which one is a hypothesis. And let's recall that a hypothesis is a proposed explanation for a phenomenon. So let's take a look for answer choice. A mixing hexane and water will not form a solution because of the difference in polarity. So it's telling us here that it does have a proposed explanation and that is because of the difference in polarity. So that makes this a correct answer choice. Okay, So let's continue to look at the rest to see if there's anything else that might be correct or we could talk about why it's wrong. So for be the volume of water was measured to be 50 ml while that of hexane is 60 ml. So this is an observation. It's not attempting to explain a phenomenon, it's just telling us what it is. B2 distinct layers formed a few minutes after hexane and water were mixed. This is also an observation. It's not attempting to explain a phenomenon like A and last D D hexane is volatile at room temperature while water is non volatile. This is also an observation. Okay, so out of the answer choices given only answer choice A is a hypothesis while everything else our observations. Okay, answer choice a explains a proposed explanation for the phenomenon. So that is it for this problem. I hope this was helpful