The first tacoma narrows bridge in washington crossed over a strait in puget sound. at the time the suspension bridge was built, construction workers noticed that it moved up and down in the wind. measures to stop the bridge’s movement were ineffective, but the bridge was opened to the public on july 1, 1940. the bridge collapsed on november 7, 1940. luckily, no people were seriously injured. determine which technological design criteria the tacoma narrows bridge did and did not meet. explain your answer.

What diagram shows the ionic compound of magnesium oxide

One of the few xenon compounds that form is cesium xenon heptafluoride (csxef7). how many moles of csxef7 can be produced from the reaction of 13.0 mol cesium fluoride with 12.5 mol xenon hexafluoride? csf(s) + xef6(s) csxef7(s)

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.)