Please help! How does the temperature of liquid nitrogen compare to the temperature of liquid water? Remember nitrogen condenses at -196 °C and freezes at -210°C and water can condense to a liquid at 100°C and freezes at 0°C.

A. liquid nitrogen is a lot warmer

B. liquid nitrogen is slightly warmer

C. liquid nitrogen is slightly colder

D. liquid nitrogen is a lot colder

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Assume that the variables x and y are inversely related. if k = 18, what is the value of y for each of the following points? be sure and record your data to be used in the following problem.

Which of the following elements is a representative element? a. chromium (cr) b. aluminum (al) c. mercury (hg) d. silver (ag)

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.)