How many moles of hydrogen are needed to completely react with 2 moles of nitrogen

During which month do the suns rays strike the northern part of the world most directly

The pressure exerted on a 240 ml sample of hydrogen gas at constant temperature is increased from 325 mmhg to 550 mm hg, what will be the final volume of the sample

Which quantum number represents the position of an electron relative to the nucleus?

A substance made of metal atoms only?

I don't know how to figure out which bonds are for the compound. Like is it molecular, covalent or ionic?

Which set of terms best defines what affects kinetic energy and potential energy, respectively? position, gravity gravity, velocity velocity, height height, position

Which radiation detection device is the best to use for measuring the presence of radiation in large moving objects where constant monitoring is impossible? film badge Geiger counter cloud chamber scintillation counter

Smoke fiilling up a room is diffusion or not

What is the independent and dependent variable for a dry ice experiment

a substance that undergoes a physical change like melting is still the same substance is it true or false