What is the average velocity of the particle from rest to 9 seconds? A.
1 meter/second
B.
2 meters/second
C.
3 meters/second
D.
4 meters/second

Oxygen and hydrogen gas are at the same temperature t. what is the ratio of kinetic energies of oxygen molecule and hydrogen molecule if oxygen is 16 times heavier than hydrogen.

Which is the correct symbol for an isotope of iodine with 53 protons and 78 neutrons?

Iron is a transition metal with multiple oxidation numbers. (answer the following) a. what is the iron (ii) ion? how does it differ from the iron (iii) ion? b. if iron were to bond with oxygen, predict the formula for each oxidation number of iron. c. how would each formula be named?