Which row in the chart below best describes the active transport of molecule X through a cell membrane? Row Movement of Molecule X ATP

1. high concentration →
low concentration used

2. high concentration →
low concentration not used

3. low concentration →
high concentration used

4. low concentration →
high concentration not used

Joan writes four numbers on the board in standard form, and then she writes their scientific notation

What term is missing from the central region that describes hypotheses, theories, and laws? popular predictable mathematical falsifiable

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.)