Write a balanced equation for the reaction that occurs in each of the following cases: (a) potassium metal is exposed to an atmosphere of chlorine gas. (b) strontium oxide is added to water. (c) a fresh surface of lithium metal is exposed to oxygen gas. (d) sodium metal reacts with molten sulfur.

The human eye contains a molecule called 11-cis-retinal that changes shape when struck with light of sufficient energy. the change in shape triggers a series of events that results in an electrical signal being sent to the brain that results in vision. the minimum energy required to change the conformation of 11-cis-retinal within the eye is about 164 kj/mol.

What is conserved in the reaction shown below? h2(g) + cl2 (g) --> 2hcl(g)a. mass onlyb. mass and moles onlyc. mass, moles, and molecules onlyd. mass, moles, molecules, and volume

8. what happens to matter during a chemical reaction