General Chemistry Answers

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

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⁻

Draw the Lewis structures of the following:

1 dihydrogen sulfide

2. carbon tetraflouride

3. nitrite ion

Explain the electrophoresis mode of separation using a schematic representation

What is the percentage composition of nitrogen in one mole of ammonium nitrate?

It takes 22.53 mL of 0.1017 M NaOH solution to reach the endpoint when titrating a 25.00 mL sample of an H₂SO₄ solution. What is the molarity of the H₂SO₄ solution?

A 50.32 gram sample of iron (with a heat capacity of 0.450 J/g ºC) is heated to 100.0 ºC. It is then transferred to a coffee cup calorimeter containing 45.07 g of water (specific heat of 4.184 J/ g ºC) initially at 20.63 ºC. If the final temperature of the system is 23.59, how much heat was absorbed by the calorimeter? Record your answer as a whole number (assume the sign is positive).