Calculate the enthalpy change when 2 l of liquid nh3 is burned in air to give n2 (g) and h2o (g). express your answer using two significant figures.

Which statement best defines a universal law

Why does a hot air balloon rise when the air inside it is heated

Consider the electrolysis of molten barium chloride (bacl2). write the half-reactions. include the states of each species.

A helium filled balloon has a volume of 208 l and it contains 9.95 moles of gas. if the pressure of the balloon is 1.26 atm determine the temperature

A buffer contains significant amounts of ammonia, nh3, and ammonium chloride, nh4cl. part a write an equation showing how this buffer neutralizes added acid, hi.

How long does it tae for bleach to evaprate?

What product (s) forms at the cathode in the electrolysis of an aqueous solution of k2so4?

What element is used as a shield to protect people from radioactive substances?

The frequency of a given region of the electromagnetic spectrum is more than 3 x 1019 HZ. Note that the speed of light is 2.998 x 108 m/s. Which waves are found in this region? A. gamma rays B. visible light C. microwaves D. radio waves E. x-rays

A farmer uses water to irrigate his potato crops. Which roles of water does this examplify