General Chemistry Answers

Gold has a specific heat of 0.129 J/g· oC. When a 5.00-g piece of gold absorbs 1.33 J of heat, what is the change in temperature? 

Phosphorus oxychloride, POCl3, is a type of industrial raw material. It is a colourless and transparent liquid, and it has an unpleasant irritating odour. It will smoke intensely in humid air.

(a) Draw all the possible Lewis structures for POCl3. [2 marks]

(b) Determine the most plausible structure from 4 (a). Explain your answer.

[4 marks]

(c) Predict, explain and label the molecular geometry and the bond angles of the structure in 4(b) [4 marks]

(d) Deduce the polarity of the structure in 4(b). [6 marks]

Signifcant fiuger of 25.2+1.34

Sulfuric Acid is a colorless strong acid that is miscible with water. It is also known as "dipping acid" because it is very corrosive and dissolves most metals. What is the formula mass of this acid if its chemical formula is H₂SO4?

The proton number of elements J and K are 13 and 16 respectively. Suggest the most

stable ions for J and K. State the type of stability of these two ions.

Calculate the mass of carbon dioxide released from the decomposition of 10.0 g of cabalt(|||)carbonate given the unbalanced chemical equation

A solution is prepared by dissolving 38.7g of nonelectrolyte into 218g of water. The freezing point of the solution is measured to be -5.53°C. Calculate the molar mass of the solute. kf of water = 1.86°C/m

What is the freezing point of a solution that contains 610g of benzoic acid, HC7H5O2, in125g of camphor? kf camphor = 40°C/m

1. The gas inside a balloon has a volume of 15.0 L at a pressure of 2.0 atm Calculate the pressure of the gas if is volume is compressed to 10.0 L at the same temperature

2. A given amount of oxyçen gas has a volume of 25.0 L at a temperature of 37°C and a pressure of 10 atm Atwhat temperature would this gas occupy a volume of 22.0 L at a pressure of 10 atm?

3. The volume of a gas sample at 0 degrees C and 1.0 atm is 10.0 L How many moles of gas are contained in the sample?

4. What would be the pressure of 6.40 g oxygen gas in a vessel with a volume of 4.5 L at 20°C?

5. A sample of oxygen gas, which is saturated with water vapor, is kept in a 10-L vessel at 30°C and has a pressure of 758 Torr If the pressure of the water vapor at this temperature s 31.8 Torr, what would be the pressure of the

dry oxygen?

A. Illustrate the equations that describe the physical quantities of motion:

distance, displacement, velocity and acceleration.