How many red photons (4.00e14 Hz) would it take to equal the energy of 20,000. green photons (565 nm)? A. 2.66e-5
B. 4.27e25
C. 2.66e5
D. 2.89e5

When curium-242 is bombarded with an alpha particle, two products are formed, one of which is a nudge on. what is the other product

Modern pennies are composed of zinc coated with copper. a student determines the mass of a penny to be 2.482 g and then makes several scratches in the copper coaling (to expose the underlying zinc). the student puts the scratched penny in hydrochloric acid, where the following reaction occurs between the zinc and the hcl (the copper remains undissolved): zn(s) + 2 hcl(aq) → h2(g) + zncl(aq)the student collects the hydrogen produced over water at 25 °c. the collected gas occupies a volume of 0.899 l at a total pressure of 79 j mmhg. calculate the percent zinc (by mass) in the penny. (assume that all the zn in the penny dissolves.)

Draw the aromatic compound toluene (methylbenzene). show all hydrogen atoms, including those on the ring.