What is the temperature of 1.2 moles of Helium gas at 1950 mmHg if it occupies 15,500 ml of volume?

Compare and contrast physical changes with chemical changes.

What occurs when a cell engulfs large food particals

If many scientists conduct the same or similar experiments, and all obtain similar results, a can be written, which is a generally agreed-upon statement that explains and predicts how a natural phenomenon works.