If you mix different amounts of two ideal gases that are originally at different temperatures, what must be true of the final state after the temperature stabilizes? (there may be more than one correct choice.)
a. both gases will reach the same final temperature.
b) the final rms molecular speed will be the same for both gases. c) the final average kinetic energy of a molecule will be the same for both gases.

a) Both gases will reach the same final temperature.

c) The final average kinetic energy of a molecule will be the same for both gases.

Explanation:

The molecules of the hotter gas will have higher average kinetic energies than those of the cooler gas. As the molecules of the molecules of the two gases collide with each other and exchange energies, the gases will reach an equilibrium in which their molecules have the same average kinetic energy.

Since average kinetic energy is a measure of temperature, both gases will reach the same final temperature.

b) is wrong. The rms speeds will differ, depending on the molecular masses of the two gases.

a: 45.9 meters

b: 4.29 seconds

step-by-step explanation:

a: h(t)=1/2(-9.8)(3)^2+0(3)+90

h(t)=-4.9(3)^2+90

h(t)=-44.1+90

h(t)=45.9 meters

b: 0=1/2(-9.8)(t^2)+0t+90

0=-4.9t^2+90

-90=-4.9t^2

18.37=t^2

t=4.29 seconds

in the second question, the numbers aren't exact, but they're a close approximation.

assuming that your periodic table has eighteen columns, you should highlight   the four elements in the third column from the left of the table.

neutral atoms of elements after calcium contain d electrons. the energy of d orbitals of a particular main shell lies between the energy of the s and p orbitals of the next main shell. for example, electrons in the have energy higher than those in the orbital while lower than those of the orbital.

by the aufbau principle, electrons fill orbitals one at a time, starting from those of the lowest energy. the orbital is therefore filled right after orbitals and before orbitals.  

potassium has electron configuration and calcium . the s orbital of a main shell holds a maximum of two electrons. the next element would thus have the electron configuration and satisfy the requirements.

a neutral atom of the element contains three electrons on top of the most recent noble gas element. it should thus be placed in the third column of the periodic table. both scandium and yttrium would satisfy the conditions. an aufbau diagram indicates that the 4f orbital is filled before the 5d. however, it appears that exceptions exists for both lanthanum and actinium. neutral atoms of the two d-block elements also demonstrate the and should be highlighted as well.