Chemistry Answers

1. Predict  How would the data in the diagram change if the pressure was 3 atm instead of 1 atm?

A student obtained a solid product in a laboratory synthesis.To verify the identity of the solid,she measured its melting point and found that the material melted over a 12^degree C range.After it had cooled,she measured the melting point of the same sample again and found that this time the solid had a sharp melting point at the temperaturr that is characteristic of the desired product.Why eere the two melting points different?What was responsible for the change in the melting point?

1.Explain why ice,which is a crystalline solid,has a melting temperature of 0^degree C.whereas butter,which is an amorphous solid,softens over a range of temperatures.

2.Why is the arrangement of the constituent atoms or molecules more important in determining the properties of a solid than a liquid or a gas?

Describe the process of catalytic cracking used in the petroleum refining industry

Your answer must also include:

·     A balanced chemical equation, physical states included and reaction conditions stated

·     Examples of a product formed from catalytic cracking (in petroleum refining) and its use

The concentrated sulfuric acid we use in the laboratory is 98.0 percent H₂SO₄ by mass. Calculate the molality and molarity of the acid solution. The density of the solution is 1.83g/mL

Isooctane is a primary component of gasoline and gives gasoline its octane rating. Burning isooctane in a bomb calorimeter releases 330.0 kJ of heat; the temperature in the bomb increases from 23.20C to 66.50C. What is the heat capacity of the bomb calorimeter?

Copper has a specific heat of 0.382 J/g0C. The temperature of an unknown mass of copper increases by 4.500C when it absorbs 3.97 J of heat. What is the mass of the copper?

Why is ammonia is used to remove rust from metals

Considering the observed IMF and strength of those forces, complete the following questions with your best predictions.

1) Rank the following molecules from lowest to highest boiling point: H2, Br2, and F2. Explain your prediction based on IMF.

2) Predict which of the following has the highest boiling point: HF or HBr. Explain your prediction based on IMF.

3) Consider water, H2O. Predict how water’s boiling point compares to HBr and HF? Explain your prediction based on IMF.

4) Look up the boiling points of H2, H2O, Br2, F2, HBr, and HF. Were your predictions correct? Explain.

A solution prepared by adding 10g of an unknown non-volatile, non-electrolyte solute to 150 g of water. The Boiling point of the solution is elevated by 0.433 ⁰C above the normal boiling point of the solvent. What is the molar mass of the unknown substance?