Nikkie

Bacterial action purifies water in lakes, streams, oceans, and BLANK? The options are in the air, deep underground, in the first couple inches of soil, or on the surface of the ground? thanks for your explanation :-)

what were 3 options for Lord Elgin and the supporting reasons and the consequences

What is the approximate volume of 0.095 M HCl needed to neutralize 0.25g of sodium carbonate. Hint: Write a balanced equation first.

Which of the following metals is oxidized by calcium ions? potassium*** zinc iron lead

The first electrochemical cell was invented by ____. Michael Faraday Alessandro Volta*** James Maxwell Benjamin Franklin

Why can't a lead storage battery be recharged indefinitely? A direct current must pass through the cells. The electrodes lose lead sulfate.*** It is difficult to reverse the direction of current flow. The electrolyte is too expensive.

Which electrode (anode or cathode) is designated as positive in an electrolytic cell? anode**** cathode both neither

The radioisotope radon-222 has a half-life of 3.8 days. How much of a 98.4 g sample of radon -222 would be left after approximately 19 days?

Use an analogy from everyday life that can define the term half-life

What is the one standard atmosphere of pressure in kilospascals 0 kPa 1 kPa*** 101.3 kPa 760 kPa

From a shipment of 75 transistors, 4 of which are defective, a sample of 6 transistors is selected at random. (b) How many samples contain exactly 3 defective transistors? (c) How many samples do not contain any defective transistors?

What piece of info is missing?