Which of the following pairs of elements will form ionic bonds, and which will not? Explain why they do, or why they will not. 14)Sulfer and Xenon
15)Sodium and Calcium
16)Strontium and Sulfer
17) Selenium and Chlorine

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.)

How many grams of phosphorus are contained in 5.09 moles of phosphorus?

What methods could you use to solubilize calcium carbonate