What causes photons to be emitted from excited atoms

Identify the basic structure of a chemical equation?

What is the correct balanced equation for the following: potassium iodide + lead (II) sulfide - -> lead (ii) iodide + potassium sulfide (A) 2KI + PbS - > Pbl2, + K2S (B) KI + PbS-> Pbl + KS (C) KI + Pb25 - > Pb2l + KS (D) 2KI + Pb25 - > Pb2l2 + K2s

Based on oxidation number consideration, explain why carbon monoxide is a flammable but carbon dioxide is not

While looking out the window, you see lightening flash and then 3 seconds later, you hear the thunder. How far was the lightening from you? A. 3,300 ft B. 3 miles C. 300 ft

Igneous rock was found near a campground. Which processes caused these rocks to form?

The complete combustion of gaseous sucrose at a constant pressure absorbs 544 kj of heapt per mole of surcrose. write the balance thermochemical equation for the reaction

Find the acceleration if a car goes from 40 to 50 mph in 5 seconds

What is the percent by mass of nahco3 in a solution containing 10 g of nahco3 dissolved in 400 ml of h2o?

Consider the reaction: 2clf3 (g) + 2nh3 (g) → n2 (g) + 6hf (g) + cl2 (g) when calculating the δh°rxn, why is the δhf° for n2 not important?

12.5 g of copper are reacted with an excess of chlorine gas, and 25.4 g of copper (II) chloride are obtained. Calculate the theoretical yield and the percent yield.