In a fluorescence spectrometer standard aqueous solutions of the fluorescent dye fluorescein are examined and yield the following fluorescence intensities: Concentration [pg/mL] 0.00 2.00 4.00 6.00 8.00 10.00 12.00 Fluorescence Intensity 2.10 5.00 9.00 12.60 17.30 21.00 24.71 What is the 95% confidence interval for the expected y-intercept

Compare and contrast physical changes with chemical changes.

Which statement is true regarding the diagram of circle p? the sum of y and z must be 2x. the sum of y and z must be x. the difference of z and y must be 2x. the difference of z and y must be x

Sandy is building a small toy car. he wants to use a balloon to power the toy car. he fills a balloon with air and then attaches a straw to the balloon. he tapes the balloon-straw combination to the car and then releases the end of the balloon. the toy moves forward as the air from the balloon comes out the back of the straw. what can sandy do to make the toy car move faster? a) use less air in the balloon. b) blow up the balloon more. c) use a longer straw. d) use larger tires.