A concentration C(mol/L) varies with time (min) according to the equation C=3.00exp(−2.00t)a) What are the implicit units of 3.00 and 2.00? b) Suppose the concentration is measured at t = 0 and t = 1 min. Use two-point linear interpolation or extrapolation to estimate C(t=0.6min) and t(C=0.10mol/L)C(t=0.6min) and t(C=0.10mol/L) from the measured values, and compare these results with the true values of these quantities. c) Sketch a curve of C versus t, and show graphically the points you determined in Part (b).

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.)

4. a 20-kg child is tossed up into the air by her parent. the child is 2 meters off the ground traveling 5 m/s. circle one: ke / gpe / both show your work for finding the values of each type of energy the object has:

Citric acid has a ph between 1 and 3.  it is considered to be aa. weak acidb. weak basec. strong based. strong acid