Which phenomenon is occurring when a person looks at a straight spoon in a glass
of water and the spoon appears bent?
a) reflection
b) prismatic reflectance
c) refraction
d) amplitude modification

1) these are barrel shaped microtubules in most animal cells, that organize the spindles during cell division

Which statement describes james chadwick’s discovery.

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.)