Which event is endothermic?

a) the burning of a match

b) the change of water vapor to a liquid

c) the combustion of propane gas

d) the melting of ice

What Le Chatelier's factors cause an increase in the concentration of Hb (CO) 4 (aq) in the Hb (CO) 4 (aq) + 4O2 (g) Hb (O2) 4 (aq) + 4CO (g)

Garrett notices a small island has formed off the coast of his hometown in Florida. Which of the following best describes what caused the island to form? A. The sand was deposited into a pile by the action of waves. B.

Bond length is the distance between the centers of two bonded atoms. On the potential energy curve, the bond length is the internuclear distance between the two atoms when the potential energy of the system reaches its lowest value.

2. How many moles of fluorine are required to produce 12.0 grams of KrFo? Given the equation: Kr + 3 F2 → KrF

Would flame tests be useful for detecting metal ions present in a mixture of metal ions? explain.

What is 0.002353 to two significant figures

10. Is the identity of an element determined by its mass number or atomic number? By omak

Nitric acid, hno3, dissociates in water to form nitrate ions and hydronium ions. what change in hybridization of the nitrogen atom occurs in this dissociation

Which is classified as a salt ammonia or sodium chloride?

How many grams of CrSO3 are in 2.4 moles of CrSO3