A device that does work with only one movement and changes the size or direction of a force is a(n) .
Question 3 options:

compound machine

effort machine

screw

simple machine

What will most likely happen when two bromine atoms bond together?

Find the number of grams of hcl needed to react completely with .50 moles of magnesium.

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.)