The concentration of many colorful solutions can be determined by the amount of light absorbed by the solution. The relationship between absorbance and concentration is a linear relationship known as Beer's law. The data below show the absorbance of a series of solutions of known concentrations of Substance A. Plot these data using Excel and determine the equation of the trendline. Use that equation to determine the concentration (M) of an unknown sample of Substance A. Concentration of Substance A (M) Absorbance

3. If the perceived color of a solution is green, what is the approximate wavelength of light that is being absorbed? (Use the color wheel) 630-720 nm violet red deep blue orange light blue yellow yellow- green 490-530 nm green 530-545 nm 580-6 545-580 450-490 nm

Lesson 12 Learning Objectives (These questions earn EA12, EC12, and and bonus EA01 & EC01 points) Quantify the properties of light when treated as a collection of particles, called photons. Quantitatively describe the wave-like properties of electromagnetic radiation. 1 & 2. One type of sunburn occurs when skin is exposed to UV light of wavelength in the vicinity of 310 nm. a) What is the energy of a photon of this wavelength? Express your answer in joules to three significant figures. b) What is the energy of a mole of these photons? Express your answer in joules per mole to three significant figures. c) How many photons are in a 1.10 mJ burst of this radiation? Express the number of photons to three significant figures. d) These UV photons can break chemical bonds in your skin to cause sunburn (a form of radiation damage). If the 310 nm radiation provides exactly the energy to break an average chemical bond in the skin, estimate the average energy of these bonds in kJ/mol. Express…

Suppose you have poured a cup of blue raspberry drink over ice in cup and let it sit to cool. Do you expect the absorbance of the drink to increase or decrease after the ice is melted in the drink? Explain.