2. One student takes 3.0 grams of unknown pure substance #1 and de- composes it to its constituent elements, nitrogen and oxygen. He finds that it is composed of 0.91 grams of nitrogen with the remainder being oxygen. A second student takes 10.5 grams of unknown pure substance #2 and decomposes it to its elements in the same fashion as the first student. She finds that unknown substance #2 consists of 3.2 grams of nitrogen with the remainder being oxygen. What is the mass percent of nitrogen and oxygen in each of the two unknown samples? What is the relationship between the different unknowns according to Dalton’s Atomic Theory?

Which element in the third period would you expect to have the larger atomic radius, sodium (na) or sulfur (s)? a. sodium, because it has a higher effective nuclear charge attracting electrons in fewer energy levels. b. sodium, because it has fewer protons attracting electrons in the same energy levels. c. sulfur, because it has more protons attracting electrons in more energy levels. d. sulfur, because it has a higher effective nuclear charge attracting electrons in the same energy levels.

Why is silver chloride is an ionic compound

How do temperature and salinity affect deepwater currents? as temperatures and salinity levels of water increase, the water rises to the surface where it creates currents as it moves to colder regions. they create changes in wind direction, moving denser water in the same direction as the wind and causing the deepwater circulation patterns found in the ocean. they equalize the forces on undersea currents caused by the coriolis effect as they replace more dense water with less dense water. they create density differences that cause dense deepwater currents to flow toward the equator where they displace less dense, warmer water above them.