The characteristics of a certain gas are listed in the table. Characteristics of a Gas
Characteristic Description
Compound Oxygen gas
Condition STP
Mass 4.8 grams

What is the expected density of the above sample of gas? (4 points)

a 1.90 g/L

b 1.82 g/L

c 1.56 g/L

d 1.43 g/L

When the earth was formed and cooled, why did nickel and iron end up in the center of the earth while basalt and granite ended up in the outer layers

The characteristic of two different types of reactions are shown below. reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of and element. which statement is true about the atoms of the elements that participate in the two reactions? a: their identity changes in both reaction a and b. b: their identity changes in reaction a but not b. c: their identity changes in reaction b but not a. d: their identity remains the same.

How many protons, electrons, and neutrons are in each of the following isotopes? a. zirconium-90 b. palladium-108 c. bromine-81 d. antimony-123