Tag: Chemistry questions

1. A concentrated phosphoric acid solution is 85.5% H3PO4 by mass and has a density of 1.69 g/mL at 25°C. What is the molarity of H3PO4? What is the mole fraction of urea, CO(NH2)2, in a solution prepared by dissolving 5.6 g of urea in 30.1 g of methanol, CH3OH? How will an understanding of this concept help you in your healthcare career?
2. Describe the blood hydrogen carbonate buffer system.

-What happens when blood acidity rises? Show the equation.

-What happens when the blood becomes more alkaline? Show the equation.

-Distinguish between strong and weak acid. List some clinical uses of these acids and write equations for their dissociation in water.

-Did you find any of these to be a challenge? Why or why not?

1. List any pure elements that are found in the food. Check this against a periodic table to ensure that you are correctly identifying these.

2. Identify any ionic compounds that are found in the food. Remember that these will typically be salts of some kind, but may not be immediately obvious from the name. As an example, remember that monosodium glutamate (NaC5H8O4N) is an example of an ionic compound from your module. (If you have started Activity 1, this will help you with this).

3. Identify any vitamins that are present in the food. Provide your classmates with the chemical formula for those vitamins (or even the structure if you find it online). Do those vitamins have names other than just the letter “Vitamin __”?

4. Were there any ingredients that you couldn’t identify or recognize? Do a quick Internet search and provide your classmates with some information about that ingredient. Be sure to cite your source!

In your responses to your classmates, pick ONE of the above questions that he or she didn’t answer in the original post and answer it for him/her.

Section 1: What are the similarities and differences among silicates, nonmetals and halogens?

Section 2:

What are the structural and the condensed structural formulas for n-octane, C8H18? What are the five isomers of hexane?