Chemistry Answers

Write a paragraph explaining the atomic theory

Reaction between solid phosphorous, P4 and oxygen gas, produces P3O6 and 1640.1kJ of heat.

How do we calculate the mass of 300 atoms of Iron(Fe)

The decomposition of Nitrogen dioxide into Nitric oxide and oxygen is an example

of a second-order reaction. It has a rate constant of 0.54 M-1s-1 at 300 Celsius.

(a) If the initial concentration of NO2 is 0.00800 M, what is the concentration of NO2 after

20.0 minutes? 

(b) If the initial concentration of NO2 is 0.00800 M, what is the half-life?

What mass of ZnCl2 can be prepared from the reaction of 3.27 grams of zinc with 3.30 grams of HCl

How many grams of NaBr (molar mass = 102.9 g/mol) would be needed to prepare 700 ml of 0.230 M NaBr solution? 

A sample of a gas taken at STP was analyzed and found to have a volume of 6.3L. The gas was then placed to a chamber where the pressure is increased by 50% while decreasing the temperature by 25% with respect to its original condition. Calculate the volume increase/decrease of the gas.

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Determine the type of bond in each pair of atoms. Which is the most polar bond? Least polar? Support your answers by calculating the electronegativity difference in each pair.

Cl - F, O - S, P - N, Na - Cl

Find the formal charge of each atom in the given compounds/polyatomic ion.

a. HBr

b. N₂0

c. SO₄²⁻