Solve for x, where M is molar and s is seconds. x=(4.5×103M−2s−1)(0.25M)3 Enter the answer. Include units. Use the exponent key above the answer box to indicate any exponent on your units.

Based on the law of conservation of energy, which statement is false? answer- energy is lost when machines dont work right

How does a hydroelectric power plant converts energy into energy.

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.)