Chemistry Answers

Give the formulas for burning magnesium in air, magnesium reacting in water and 

magnesium reacting with carbon dioxide.

Balanced this equation Na3PO4 + CaCl2 → Ca3(PO4)2 + NaCl (show all steps)

50.0g of ammonia reacted with 50.0g of carbon dioxide and 60.0g of urea was obtained.

Determine the percent yield for this reaction. Give the formula for the reaction and state 

the limiting reagent.

What is the Molality of a solution containing 7.78g of Urea [(NH2)2CO2] in 203g of water? 

What is the difference between Homogenous mixtures and Heterogenous mixtures?

What are the four main differences between covalent bonding and Ionic bonding?

Write the formula of the conjugate acid or base of the following substances.

Acids

1. HCl2. HCO3–

Base

1.CN-2. H2O

9. What is the root mean square speed of Uranium Hexafluoride at 298 K and at 373 K?

11. Methane effuses through a pinhole in 64 seconds while it takes an unknown gas 124 seconds. What is the molecular mass of the unknown gas?

7. A sample of helium gas diffuses 15.0 cm in 3.0 minutes. How long would it take a sample of Cl2 gas to diffuse a distance of 15.0 cm under the same conditions? 

What is the boiling point in degrees Celsius of a solution formed by dissolving 3.75 mol of KCl in 1.00 kg of water?It is understood that the unit is ∘𝐶. Do not include units. Only enter the numerical value

When CO2(g) is put in a sealed container at 730 K and a pressure of 10.0 atm and is heated to 1420 K, the pressure rises to 24.1 atm. Some of the CO2 decomposes to CO and O2.

Calculate the mole percent of CO2 that decomposes. Express your answer using two significant figures.