Biology Final Review Pt. 2 Flashcards
The reactivity of an atom is determined by [BLANK]
Valence Electrons
T or F: Living organisms are made mostly of the elements carbon, hydrogen, calcium and oxygen.
False
T or F: Radioactive isotopes are ones that spontaneously decay and release particles and energy.
True
Bonds are actually [BLANK] between atoms.
energy
How are ionic bonds formed?
one atom gives up an electron to the other atom
Which atom does NOT have a high electronegativity and thus is not involved in hydrogen bonding?
Responses
Chlorine
T or F: The properties of water are due to the polarity of the water molecule.
True
If a woman’s breast milk has a pH of 7.6, we would say that this is in ______.
Alkalosis
Which of the following substances is a compound?
table salt (NaCl)
potassium ion (K+)
hydrogen gas (H2)
sodium (Na)
Table salt
Pure water is neutral. Where would it fall on the pH scale?
7
pH value that represents the smallest concentration of H + ions?
13
T or F: If strong acids are spilled on the skin, they will burn the skin (caustic). If a strong base is spilled on the skin, nothing will happen.
False
Distilled water molecules will spontaneously break apart into ions but will test at 7 on the pH scale. Why does this occur?
There is an equal number of OH- and H+ ions released.
What is the difference in ion level between a 7 and a 9 on the pH scale?
100x
Weak acids or weak bases are used to restore the pH of body fluids. What is the name for such substances that can natural or artificial (added to the body by ingestion)?
Buffers
