Answer:
The two that are true are, "this represents a pure compound in two different states" and "it represents a mixture a solid and a gas".
Explanation:
This two are concluded only from the picture and the use of uniform colors throughout the picture (Showing the same element).
Answer: C... Because Zinc is made of only one type of atoms.
Explanation: All elements are made of one type of atom. Pure gold is made out of only gold atoms, silver out of only silver atoms, etc.
Answer:
An ion is a charged atom or molecule. It is charged because the number of electrons do not equal the number of protons in the atom or molecule. An atom can acquire a positive charge or a negative charge depending on whether the number of electrons in an atom is greater or less then the number of protons in the atom.
Explanation:
hope it's right
We let x be the pressure of each product at equilibrium, giving this ICE table:
2NO2 (g) ↔ 2NO (g) + O2 (g)
Initial pressure (atm): 0.500 0 0
Change (atm): -2x +2x +x
Equilibrium (atm): 0.500-2x 2x x
We can calculate x from Kp:
Kp = [NO]^2 [O2] / [NO2]^26.5x10^-6 = (2x)^2 (x) / (0.500-2x)^2
Approximating that 2x is negligible compared to 0.500 simplifies the equation to
6.5x10^-6 = (2x)^2 (x)/(0.500)^2 = 4x^3 / (0.500)^2
Then we solve for x:
x3 = (6.5x10^-6)(0.500)^2 / 4
x = 0.00741
The pressure of NO2 at equilibrium is therefore
Pressure of NO2 = 0.500-2x = 0.500 - 2(0.00741) = 0.4852 atm