What first 16 elements were known in 1760

What is the pressure of 0.540 mol of an ideal gas at 35.5 L and 223 K

What is the energy required to excite one na atom (wavelength = 589 nm) ? to excite one mole of na atom?

The standard unit for measuring made is the gram. True or False

4. Your mass doesn't change when on Earth versus the moon, but your weight does. Explain why this is the case.

What is the diffrence between earth fragments and rock fragments that are found in soils

An atom of argon in the ground state tends not to bond with an atom of a different element because the argon atom has 1). More protons than neutrons 2). More neutrons than protons. 3) a total of 2 valence electrons. 4).

When bases dissolve in water they release what type of negative ion?

An acid is added to water, and a new equilibrium is established. What is the system after the acid is added?

The hydrogen spectrum has a red line at 656 nm, and a blue line at 434 nm. What is the first order angular separation between the two spectral lines obtained with a diffraction grating with 5000 rulings/cm? A. 7.7 degrees B. 16.6 degrees C. 6.

g write net ionic equations for the reactions of h2po4 - an amphiprotic ion with aqueous solutions of hcl koh