What is the percent composition of each element in H2Ch2? please show work

Identify one disadvantage to each of the following models of electron configuration: dot structures arrow and line diagrams written electron configurations type in your answer below.

Analyze how limestone is weathered and identify the features that are formed as a result of this dissolution

How could a student test the effect of removing heat from a gas that is stored in a sealed container? what must occur in order for matter to change states?