The doppler effect indicates that the universe is expanding because
a. light from other galax...
Chemistry, 02.02.2020 13:43 janayshas84
The doppler effect indicates that the universe is expanding because
a. light from other galaxies is the same color.
b. light from other galaxies is different colors.
c. light from other galaxies is blue shifted
d. light from other galaxies is red shifted.
Answers: 2
Chemistry, 22.06.2019 06:30
This drawing shows a human body system. what is the primary function of this body system?
Answers: 3
Chemistry, 22.06.2019 11:40
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.)
Answers: 1
Chemistry, 22.06.2019 18:30
How many moles of bromine are needed to produce 3.23 moles of potassium bromide
Answers: 1
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