Why does the mass number for an element differ from the average atomic mass for the element?

Describe that alkynes are more unsaturated compounds than alkenes?

a) A table tennis ball has been hit is about 13.16 times as fast as the speed for the swimming. What is the speed of the table tennis ball?

Which part of an atom is gained, lost, or shared during a chemical Reaction

How do you find half life like i know the formula with 1/2 but how do you know how many times you do it

What is the vapor pressure of a solution with a benzene to octane molar ratio of 2 1?

Which trends are observed when the elements in Period 3 on the Periodic Table are considered in order of increasing atomic number? (1) The atomic radius decreases, and the first ionization energy generally increases.

The enthalpy of formation of MX is ΔHf° = - 525 kJ/mol. The enthalpy of sublimation of M is ΔHsub = 139 kJ/mol. The ionization energy of M is IE = 437 kJ/mol. The electron affinity of X is ΔHEA = - 313 kJ/mol. (Refer to the hint).

Which group of elements could you not use in making fireworks?

A 5.0 M solution of HCL in water has a proton concentration of _M

How many moles are in 25.5 grams of Silver, Ag?