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How do buffers minimize change in ph of biological system

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Reference no: EM13830906

Question 1 A needle can be made to "float" on the surface tension of water. What causes this surface tension to form?

The adhesion of water molecules to the needle

The heat capacity of water

The cohesion of water molecules to each other

The solubility of water

 
Question 2 How do buffers minimize change in the pH of biological systems?

By donating H+ ions when there is a shortage

By absorbing H+ ions when there is an excess

Both of these

Neither of these

Question 3 One of the four properties of water is

insulation

polarity

moderates temperature

water is a solute

 Question 4 Select the most complete explanation of what the pH scale actually measures.

The concentration of hydrogen ions in a solution

The concentration of hydroxide ions in a solute

The alkalinity of a solvent

The acidity of a solvent

 
Question 5 Something with a pH of 5 would be ________.

acidic

alkaline

neutral

basic


Question 6 The difference in pH units between two acidic solutions is three. How much more acidic is the stronger acid than the weaker acid?

3 times more acidic

100 times more acidic

30 times more acidic

1,000 times more acidic

  Question 7 Water "beads up" on synthetic fabric like polyester but binds to cotton. What is the most likely explanation for this?

Polyester is nonpolar, whereas cotton is polar.

Polyester is more flexible than cotton.

Polyester fibers are thinner than cotton fibers.

Polyester is not a naturally occurring substance, whereas cotton is a naturally occurring substance.

 
Question 8 Water is the lightest (least dense) when it ________.

freezes

is just below boiling

is at room temperature

is just above freezing
 

Question 9 We are about 75% water
True
False

 
Question 10 Why is one side of a water molecule partially negative while the other side is partially positive?

Uneven sharing of electron pairs occurs due to the strong pull of hydrogen.

Uneven sharing of electron pairs occurs due to the strong pull of oxygen.

Hydrogen donates its electrons to oxygen.

Oxygen donates its electrons to hydrogen.

Reference no: EM13830906

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