How much heat is required to warm 50.0 g of water (c = 4.184 J/g·°C) from 20.0 °C to 45.0 °C?

H₂ + I₂ ⇌ 2HI has K = 49. Starting with 0.200 M of each reactant (no HI), the equilibrium [HI] is:

For 2H₂ + O₂ → 2H₂O, ΔH = −572 kJ. How much heat is released when 4.0 mol of H₂ burns?

A reaction has K = 2.0×10⁵ at 298 K. ΔG° is: (R = 8.314 J/mol·K)

A candy bar contains 250 food Calories (Cal). How many kJ is this? (1 Cal = 1 kcal; 1 cal = 4.184 J)

Using ΔG°f values (CO₂ −394.4, H₂O(l) −237.1, CH₄ −50.5 kJ/mol; O₂ = 0), ΔG° for CH₄ + 2O₂ → CO₂ + 2H₂O(l) is:

Doubling [A] quadruples the initial rate; doubling [B] has no effect. The rate law is:

Instructions: Your classmate is feeling very sick today and asked you to tell the professor why they won’t be able to come to class. Did they have an incident? Describe their symptoms to your professor and give some reasons why they are unable to come to class. What parts of their body hurt? What does the doctor want your classmate to do in order to get better? Does the doctor prefer them to take any specific medicines or eat certain meals? What advice did the doctor give them? Do you have any recommendations for your classmate? How long will they be unable to come to class? When do you expect them to recover? Finish by letting the professor know when your classmate is expected to be feeling better and their availability for making up any missed assignments. Use por and para, the subjunctive with expressions of emotion, hope, desire, influence, and advice, and verbs like esperar, desear, necesitar, preferir, querer, and recomendar, and the vocabulary on Las partes del cuerpo, la salud, médicos, farmacias y hospitales (health vocabulary).

I am sorry to ask for such a weird thing, but it has sadly become necessary. Show your ears to the camera to demonstrate you don’t have headphones in. 

8) Design an active-high LED circuit and an active-low LED circuit.  The signals are C(H) and D(L). Label the signals C(H) and D(L) in your circuits. The circuits should do nothing else. An LED symbol is shown below. (If you miss this, you will earn negative points.) Use your scratch paper and label this 8.