Pure Water Has a PH of 7

question 19

Multiple Choice

Pure water has a pH of 7. The inside of a cell is also about pH 7. This might be so because

• A)buffers work best when the pH is close to 7.
• B)humans are largely made up of water by weight.
• C)most of the chemical reactions that occur in humans can proceed optimally at pH 7.
• D)ionic bonds cannot form at pH 7.

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Definitions:

Symbolic Function

A cognitive ability emerging in early childhood, allowing for the representation of objects, events, and ideas through symbols such as words or images.

Conservation

Piaget’s term for awareness that two objects that are equal according to a certain measure remain equal in the face of perceptual alteration so long as nothing has been added to or taken away from either object.

Symbolic Function

The ability to use symbols or abstract signs to represent something beyond direct experience.

Mental Representations

Internal images, ideas, or thoughts that stand in for objects, events, or relations in the outside world, aiding in cognition and perception.