A helium balloon contains 0.54 g of helium. given the molecular weight of helium is 4.0 g/mol, how many moles of helium does it contain?

Which statement describes an effect of large asteroid and comet impacts?

If an atom has an atomic number of 12 and a mass number of 16 how many protons does it have

An expert archer tries to shoot an arrow into a target lying at the bottom of a shallow pool, even though the water does not change the direction of the arrow, the archer misses the mark by several inches.

If coefficients of a balanced equation are doubled the enthalpy change for reaction is

Is glucose a solution colloid or suspension?

According to molecular orbital theory, all diatomic molecules with an even number of electrons will be diamagnetic. True or False?

Which of the following equilibria would be impacted by a change in pressure? Select the correct answer below: H2 (g) + I2 (g) →2HI (g) NO (g) + O3 (g) →NO2 (g) + O2 (g) 2SO3 (g) →2SO2 (g) + O2 (g) CO (g) + H2O (g) →CO2 (g) + H2

A common stain remover is sold in concentrated form as 3M sodium hypochlorite (NaOCl). You need to create 400 milliliters of a 0.5M solution of sodium hypochlorite to fill a spray bottle. What volume of 3M sodium hypochlorite is needed? 15.0 mL 66.

A chemical reaction that takes in heat is called: exothermic endothermic a phase change

Which of the following lines (of latitude or longitude) would represent by 180 longitude? South Pole Equator Prime meridian North Pole International date line