Which phrase best describes a chemical reaction? A. mixing two substances B. the combustion of a substance C. forming or breaking bonds D. the decomposition of particles

Part a in an effusion experiment, it was determined that nitrogen gas, n2, effused at a rate 1.812 times faster than an unknown gas.

What force always resists or opposes acceleration?

An experiment was performed to study the germination of radish seeds under different conditions. Patches of radish were planted in two sections of a small field.

Calculate the mass of water produced when 1.92 g of butane reacts with excess oxygen.

What is the volume (in liters) occupied by 49.8 g og HCl at STP

Which statement best explains why carbon is present in so many kinds of molecules? Question 1 options: It is abundant on earth, so it is readily available to bond with other elements. It does not form strong bonds, so it breaks apart.

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