*only k12 8th grades student may answer.*

*50pts*

; )

*dont put nothing random just for point i will report u *

quiz: changing velocity math assessment timer and count assessment items assessment started: undefined. item 1 if you are asked to determine an object’s speed, what information must you have? period of time and direction distance and period of time distance and change in position distance and direction

What were the success and failures that came to boyle’s excitements?

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.)

What term is applied to a scientist who studies ancient life, including animal and plant fossils a. anthropologist b. dendroclimatologist c. geophysicist d. paleontologist