The image on the right was produced by a computer. It shows a complex molecule consisting of many atoms. What would be an advantage of using a computer to create a model like this, instead of building it by hand.

What mass of carbon dioxide is produced from the complete combustion of 4.50×10−3 g of methane?

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.)

Ajet plane is speeding down the runway during takeoff. air resistance is not negligible. identify the forces on the jet.