Which of the following is not a polyatomic ion?

A. NH4

B. OH

C. NO2

D. NO3

E. None of the Above

What are two ways that compounds are different from the elements that form them?

What is the rate of the reaction 4 nh3 + 5 o2 → 4 no + 6 h2o when 0.0500 mol/l of nh3 is being consumed per second? 1. 0.0125 m·sec-1 2. one of the other answers has the right number but the units are wrong. 3. - 0.0125 m·sec-1 4. 0.200 m·sec-1 5.

Sterling silver is an alloy of silver made up of around 93% silver and 7% other metals, such as copper, all blended together to form the substance. What type of mixture is sterling silver?

For the gas phase reaction N2 + 3 H2 2 NH3 ΔHº = - 92 kJ for the forward reaction. In order to increase the amount of H2 present, the reaction should be run

In a paper chromatography chamber, which example could be the stationary phase? air plastic plate paper

A certain element x has four isotopes. 5.845% of x has a mass of 53.93961 amu. 91.75% of x has a mass of 55.93494 amu. 2.123% of x has a mass of 56.93539 amu. 0.2820% of x has a mass of 57.93328 amu. what is the average atomic mass of element x?

Which of the following is a type of electromagnetic radiation? a. Electrons b. Neutrons C. Electromagnetic waves d. Helium nuclei

Which formula can represent hydrogen ions in an aqueous solution? OH - (aq) Hg2^2 + (aq) H30 + (aq) NH + (aq)

A gas has a temperature of 14 degrees C and volume of 4.5 liters. If the temperature is raised to 29 degrees C and the pressure is not changed, what is the new volume of the gas? .

How much heat is needed to raise the temperature of 50.0 g of water from 4.5 ⁰C to 83.0 ⁰C?