20. 6th-grade question NEED HELP PLEASE
Which statement best describes the relationship between visible light and the electromagnetic spectrum?

A. Visible light and the electromagnetic spectrum are different names for the same phenomenon.
B. Visible light occupies about half of the electromagnetic spectrum.
C. Visible light is a narrow band in the electromagnetic spectrum.
D. Visible light and the electromagnetic spectrum have a small area of overlap.

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.)

Why is retrograde motion an apparent motion

What type of organic molecule comprises the majority of a potato?