Jay wants to know how the amount of acidity in rainwater influences the weathering rate of limestone. to answer his question, jay performs an experiment in which he soaks identical pieces of limestone in 200 ml of different carbonic acid solutions. the ph of the solutions range from 3.0 to 5.5. after performing his experiment once, he reports his data and draws a conclusion. what can jay do to improve the reliability and accuracy of his data?

At a temperature of 393 k, the temperature of a sample of nitrogen is 1.07 atm what will the pressure be at a temperature of 478 k

Identify two types of chemical bonding in the source of dietary potassium

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.)