How old is the earth?

What is the final volume of a gas that initially occupies 2.50 l at 298 k and is subsequently heated to 334 k?

Compared to size of earth, the atmosphere is very

What is the de Broglie wavelength (in meters) of a 45-g golf ball traveling at 72 m/s?

If you place a paper towel in water, the water will move across the paper towel. which of the following properties best explains why? surface tension adhesion cohesion both adhesion and cohesion

Why is Tin important? Elaborate on the importance.

Student follow up The ionic equation for the reaction between zinc and sulfuric acid is. Zn (s) + 2H (aq) - - Zn" (aq) + H2 (g) a State what has been oxidised in this reaction. Explain your answer in terms of electrons.

What kind of group 1 atoms are the most reactive? a. Small atoms c. Atoms with the most electrons in the valence level b. Large atoms d. Atoms at the top of the periodic table

What does it mean when there are 2.3 x 10-4 moles?

Electric force is an A. attraction and repulsion between protons and electrons . B. attraction and repulsion between protons and neutrons. C. attraction and repulsion between neutrons and electrons.

A salt crystal has a mass of 0.18 mg. how many nacl formula units does it contain?