As the temperature of the air increases one would expect that Select one: a. the

Question

As the temperature of the air increases one would expect that

Select one:

a. the density of the air would also increase

b. the density of the air would not change

c. the density of the air would decrease

2. Which one of the following equations is not balanced? (Due to a typo there are in fact 2 unbalanced equations - your choice of either of the correct two will gain full marks)

Select one:

a. 2 Al2O3 2 Al + 3 O2

b. K2CrO4 + Pb(NO3)2 2 KNO3 + PbCrO4

c. 4 Fe3O4 + O2 6 Fe2O3

d. C7H16  + 5O2 7CO2 + 8H2O

3. A base can be described as a chemical species that when dissolved in water produces

Select one:

a. hydronium ions.

b. a solution with a low pH.

c. a buffer solution.

d. hydroxide ions

4. Which of the following statements is not correct?

Select one:

a. Enzymes are biological catalysts.

b. Starch is a carbohydrate.

c. Lipids such as cholesterol are water soluble.

d. Proteins are made up of many amino acids.

5. The ability of a buffer to resist change in pH is called its buffer capacity. Based on your practical experience, how would a 1/10 dilution affect the buffer capacity.

Select one:

a. There would be no change.

b. Buffer capacity would decrease by a factor of 10.

c. Buffer capacity would decrease slightly.

Explanation / Answer

1. As tempertaure increases, density decreases.

So, the correct option is c. the density of the air would decrease

(One question at a time is as directed)

Have a nice day!

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