Which indicator most likely suggests that a chemical change is taking place? change in size change of color change of state change in shape

The molecular formula for caffeine is cshion402. which of the following elements is not found in caffeine?

What is the volume of the fluid in the graduated cylinder with accuracy and measured to the correct degree of precision? 41.2 ml 42.0 ml 41.23 ml 41.89 ml

In the space, show a correct numerical setup for calculating the number of moles of co2 present in 11 grams of co2