How many moles are in 150g of Calcium?

what does a horizontal row of elements in the periodic table represents

The forensic technician at a crime scene has just prepared a luminol stock solution by adding 19.0 g of luminol into a total volume of 75.0 mL of H2O. What is the molarity of the stock solution of luminol?

What is the amount of sediment a river carries

In 1909, Ernest Rutherford performed an experiment to explore the atomic structure. In his experiment, he projected high-speed α‎ particles onto a thin gold foil. He found that all α‎ particles did not follow the same path.

Which substance is naturally made up of carbohydrates? wax butter olive oil sugar

discuss the origin of the line citing the bohr theory of the atom specify any energy transitions that are applicable

What does the chemical formula of an ionic compound represent?

The wavelength of some yellow light is 580.0 nm. What is the frequency of this yellow light?

A sample of chlorine gas contracts from 550 mL to 376 mL when it is cooled from 63 °C to 12 °C. If the initial pressure of the chlorine was 725 torr, what is the final pressure of the chlorine?

The skin and lungs get rid of this waste? What does it het rid of?