The molecular formula for caffeine is C8H10N4O2. Which of the following elements is not found in caffeine?

Particles in 2.15 moles of gold

Iron has a density of 7.86 g/cm^3. Calculate the volume (in dL) of a piece of iron having a mass of 3.52 kg.

How many moles of pcl5 can be produced from 23.0 g of p4 (and excess cl2) ? express your answer to three significant figures and include the appropriate units?

In the Lab you report a measured volume 128.7 of water. Using significant figures as a measure, what range of answers does your reported volume imply

Is an element that is soft and easy to cut cleanly with a knife likely to be a metal or a nonmetal?

If a sealed syringe that contains some gas in heated in which direction will the syringe plunger move

Use the drop‑down menus to label the statements as either true of false. Dichloromethane is flammable. true false Methanol is flammable. Concentrated sulfuric acid is corrosive. 10% sodium carbonate solution must be used in the fume hood.

What is the process all rocks are continuously in during which that can change into other types of rocks

Collagen is made of fibers and is found in tendons and cartilage. Collagen contributes to meat toughness and is, therefore, an example of which type of protein?

1. Why does CH30 evaporate faster than water?