The mass of an electron is 9.11 10-28

g. what is the mass of a mole of electrons?

What is the chemical symbol for nitrogen? A) N B) Ni C) Na D) Ne

What occurs when sediment gets deposited as the energy of the water decreases?

The potential energy of a 25 kg bicycle resting at the top of a 3 m high hill is what?

Select the characteristics of a hydrogen bond: A an attraction between polar molecules B a gravitational force C intermolecular force between hydrogen and oxygen, fluorine, or nitrogen D hydrogen attracted to weakly positive atoms

What happens to the temperature of a substance during a phase change? A. It increases rapidly as energy is added. B. It increases slowly as energy is added. C. It stays the same as energy is added. O D. It decreases as energy is added.

A piece of magnesium metal is heated in the presence of chlorine gas, and a reaction takes place. What compound will most likely be produced? A. Mg2C1 B. MgCl3 C. MgCl2 D. MgCI

What is the pressure of the gas in this mercury manometer if h = 81 mm and atmospheric pressure is 749 mmHg

A microscope containing two or more lenses is an

What word means the remains or imprint of once living organisms found in layer of rock

A balance chemical reaction obeys the law of