I'm really stumped on this question, : (
suppose now that you wanted to determine the density of a small crystal to confirm that it is graphite. from the literature, you know that graphite has a density of 2.25 g/cm^3 . how would you prepare 20.0 ml of the liquid mixture having that density from pure samples of chcl^3 ( d = 1.492 g/ml) and chbr^3 ( d = 2.890 g/ml)? (note: 1 ml = 1 cm^3.)

A100-watt light bulb radiates energy at a rate of 100 j/s. (the watt, a unit of power or energy over time, is defined as 1 j/s.) if all of the light emitted has a wavelength of 525 nm , how many photons are emitted per second?

Sulfuric acid (a component of acid rain) reacts with limestone (calcium carbonate) to produce calcium sulfate and carbon dioxide. this damages buildings and statues made of limestone. which solution of sulfuric acid will damage these structures more quickly? a. 0.001% b. 0.005% c. 0.010% d. 0.015%

Calculate: select the worksheet tab. this tab you calculate the analyte concentration.  fill in the first set of boxes ("moles h2so4" and "moles naoh") based on the coefficients in the balanced equation. (if there is no coefficient, the value is 1.)  record the appropriate volumes in the "ml naoh" and "ml h2so4" boxes.  record the concentration of the titrant in the m naoh box. click calculate. what is the concentration listed