I think the correct answer is A. Since milk has a higher KE than the ice cubes, KE is being transferred from the milk to the molecules of ice which increases the kinetic energy of the molecules of ice.Consequently, it raises the temperature of the ice while lowering the temperature of the milk until they reach equilibrium at a final temperature.
2Mg + O₂ ---> 2MgO
2 atoms Mg --- 1 molecules O₂
X atoms Mg --- 5 molecules O₂
X = 2×5
X = 10 atoms Mg
Answer:
1. The equilibrium lies to the left.
Explanation:
N₂O₄ ⇌2NO₂; Keq = 5.85 × 10⁻³
1. Position of equilibrium
Keq < 1, so the position of equilibrium lies to the left.
2. Equilibrium concentration
(a) Set up an ICE table.
(b) Calculate the equilibrium concentration
![K_{\text{c}} = \dfrac{\text{[NO$_{2}$]}^{2}}{\text{[N$_{2}$O$_{4}$]}} = \dfrac{(1.78 \times 10^{-2})^{2}}{\text{[N$_{2}$O$_{4}$]}} = 5.85 \times 10^{-3}\\\\\begin{array}{rcl}\\(1.78 \times 10^{-2})^{2}&=&\text{[N$_{2}$O$_{4}$]} \times 5.85 \times 10^{-3}\\\text{[N$_{2}$O$_4$]}&=& \dfrac{(1.78 \times 10^{-2})^{2}}{5.85 \times 10^{-3}}\\\\& = & \mathbf{5.41 \times 10^{-2}}\textbf{ mol/L}\\\end{array}\\](https://tex.z-dn.net/?f=K_%7B%5Ctext%7Bc%7D%7D%20%3D%20%5Cdfrac%7B%5Ctext%7B%5BNO%24_%7B2%7D%24%5D%7D%5E%7B2%7D%7D%7B%5Ctext%7B%5BN%24_%7B2%7D%24O%24_%7B4%7D%24%5D%7D%7D%20%3D%20%5Cdfrac%7B%281.78%20%5Ctimes%2010%5E%7B-2%7D%29%5E%7B2%7D%7D%7B%5Ctext%7B%5BN%24_%7B2%7D%24O%24_%7B4%7D%24%5D%7D%7D%20%3D%205.85%20%5Ctimes%2010%5E%7B-3%7D%5C%5C%5C%5C%5Cbegin%7Barray%7D%7Brcl%7D%5C%5C%281.78%20%5Ctimes%2010%5E%7B-2%7D%29%5E%7B2%7D%26%3D%26%5Ctext%7B%5BN%24_%7B2%7D%24O%24_%7B4%7D%24%5D%7D%20%5Ctimes%20%205.85%20%5Ctimes%2010%5E%7B-3%7D%5C%5C%5Ctext%7B%5BN%24_%7B2%7D%24O%24_4%24%5D%7D%26%3D%26%20%5Cdfrac%7B%281.78%20%5Ctimes%2010%5E%7B-2%7D%29%5E%7B2%7D%7D%7B5.85%20%5Ctimes%2010%5E%7B-3%7D%7D%5C%5C%5C%5C%26%20%3D%20%26%20%5Cmathbf%7B5.41%20%5Ctimes%2010%5E%7B-2%7D%7D%5Ctextbf%7B%20mol%2FL%7D%5C%5C%5Cend%7Barray%7D%5C%5C)
Check:
It checks.
Answer: option <span>B. The nucleus contains protons and neutrons and is orbited by electrons.
This is the planetary model, which is so known nowadays, but it is not correct. The quantum model is based in orbitals (not orbits), which are regions around the nucleus where are the electrons, but they are not circling around the nucleus. </span>
