Chemistry Of Life (Mid 1) Flashcards
Atoms that have the same number of protons and electrons are electrically neutral because:
a
their electrons are not found in the nucleus
b
they have neutrons that cancel both positive and negative charges
c
the positive charges on the protons and the negative charges on the electrons cancel each other out
d
their electrons have much less mass than their protons
c
the positive charges on the protons and the negative charges on the electrons cancel each other out
Which do you think is a stronger bond: covalent or ionic?
a
Covalent
b
Ionic
c
It depends
c
It depends
Why do salt crystals (Na+ and Cl-) easily dissolve in water?
a
Because water forms ionic bonds with Na+ and Cl-
b
Because the ionic bonds of water will break open the crystal
c
Because the heat capacity of water decreases the boiling point of salt
d
Because the partial charges in water molecules allow it to attract and surround each Na+ and Cl-
d
Because the partial charges in water molecules allow it to attract and surround each Na+ and Cl-
Phospholipids are long molecules with two ends: a nonpolar end and a polar end. This means that:
a
both ends will be attracted to water
b
neither end will be attracted to water
c
the polar end will be attracted to water, whereas the nonpolar end will not
d
the nonpolar end will be attracted to water, whereas the polar end will not
c
the polar end will be attracted to water, whereas the nonpolar end will not
Coffee has a pH of around 5 and tomato juice has a pH of around 4. Based on this you know that:
a
coffee has more hydrogen ions than tomato juice does
b
if orange juice has a pH of 3, then the difference in the number of hydrogen ions between coffee and tomato juice is about the same as the difference in the number of hydrogen ions between tomato juice and orange juice
c
coffee is less acidic than tomato juice is
d
A, B, and C are all true
e
A, B, and C are all false
c
coffee is less acidic than tomato juice is
Is water polar or non polar
Polar
