The atomic mass of an element is the weighted average mass of the isotopes of that element. (true or false)
atoms with the same number of protons but different number of neutrons are called what? (choices: _isotopes, ions , iosomers)
how many neutrons are in potassium-40? the chemical symbol for potassium is k.
(choices: _19,20,21,40))

Asolution at 25 degrees celsius is 1.0 × 10–5 m h3o+. what is the concentration of oh– in this solution?

How do forces between particles in gases compare to forces in the other states of matter? o a. the forces in gases are stronger than forces in solids but weaker than forces in liquids. o b. the forces in gases are weaker than forces in solids but stronger than forces in liquids. o c. the forces in gases are weaker than forces in solids and liquids. o d. the forces in gases are stronger than forces in solids and liquids. submit

Given sno2 + 2h2 - sn + 2h20 tin oxide reacts with hydrogen to produce tin and water. how many moles of sno2 are needed to produce 500.0 grams of sn?