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Gen Bio Ch 1 & 2 review (Chemistry) Flashcards | StudBud
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Gen Bio Ch 1 & 2 review (Chemistry)
Gen Bio Ch 1 & 2 review (Chemistry)
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#scientific method #chemistry
Flashcards
29 cards
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Questions
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Answers
1
When you add acid to a solution, _____.
the hydrogen ion concentration increases and lowers the pH
the hydrogen ion concentration decreases and raises the pH
the hydrogen ion concentration decreases and lowers the pH
the hydrogen ion concentration increases and raises the pH
2
Tissues are composed of _____.
populations
cells
organ systems
ecosystems
3
The ability of water molecules to stick together lets insects walk on water. This is called:
adhesion
vaporization
evaporation
cohesiveness
4
Which of the following statements is true about compounds?
They have 2 or more elements in a fixed ratio to each other.
They have polarity.
Twenty-five compounds are essential to life.
They are smaller than any one element.
5
Generally, what determines the chemical bonding and reactivity characteristics of an element?
number of electron shells present in the atoms
mean energy level of its electrons
number of electrons in its outer shell
number of protons plus the number of neutrons
6
Which is involved in hydrogen bonding?
loss of electrons
equal sharing of electrons
electronegativity
attraction between like partial charges
7
Grapefruit juice is pH 3, and tomato juice is pH 4. Grapefruit juice contains _____ H
+
half as much as tomato juice
one-tenth as much as tomato juice
ten times as much as tomato juice
twice as much as tomato juice
8
Which one of the following subatomic particles has appreciable mass and lacks a charge?
boson
proton
neutron
electron
9
The partial charges in this water molecule occur because of _____.
covalent bonding
the unequal sharing of electrons between hydrogen and oxygen
ionic bonding
the high electronegativity of hydrogen
10
There is an uncharged atom of oxygen (atomic number = 8) in the figure below. It has _____.
8 protons and 8 electrons
8 protons and 8 neutrons
8 neutrons
8 neutrons and 8 electrons
11
Which of the following is the most inclusive level of biological organization?
organism
community
population
cell
12
What is believed to be most synonymous with life outside of earth?
liquid water
oceans
the presence of infrared radiation
soil
13
Natural selection tends to act at which of the following levels?
population
phylum
species
kingdom
14
An element has 8 protons, 9 neutrons, and 8 electrons. Its atomic # and its mass # are _____.
8 and 16
9 and 16
16 and 8
8 and 17
15
The chemical energy used by most organisms for metabolism and growth ultimately comes from ___.
heat
the decomposition of plants
the sun
carbon dioxide
16
An atom has an atomic # of 4 and charge of +1. It has 4 protons. How many neutrons are there?
2
4
The answer cannot be determined from the information.
5
17
Changing the number of _____ would change an atom into an atom of a different element.
bonds formed by an atom
electrons orbiting the nucleus of an atom
protons in an atom
neutrons in an atom
18
Which of the following dissociations is that of an acid?
NH3 + H+ → NH4+
NaOH → Na+ + OH-
HF → H+ + F-
H2O → H+ + OH-
19
A. elegans
is a unicellular, photosynthetic, eukaryote. To which
domain
of life does it belong?
Eukarya
Plantae
bacteria
archaea
20
Which of the following is
not
a characteristic of all known life?
containing one or more cells
evolution
containing DNA
movement
21
A drug kills 99.9% of bacteria. What will happen with continued application of this drug?
There will be an equilibrium where the drug is 50% effective
Over time, the drug will become less and less effective.
Eventually, all of the bacteria will be wiped out
Each time it's used, it will kill 99.9% of the bacteria
22
Which of the following describes a covalent bond? ( Module 2.8)
It involves an atom that loses an electron.
It involves two or more atoms sharing one or more neutrons
Two or more atoms share electron pairs.
It involves an atom that gains an electron.
23
On a humid day, you are more likely to get overheated. This is because
humid air holds more heat
you sweat too much
hydrogen bonds in sweat can't break
sweat can't evaporate
24
What would happen if an ecosystem lacked decomposers?
There would be more nutrients available to animals.
There would be more nutrients available to plants.
The ecosystem would stop functioning.
There would be more energy available to plants.
25
A pH of 6 contains how many more H+ ions than a pH of 9? ( Module 2.15)
1,000
300
100
3
26
Adding a base tends to _____ of a solution.
lower hydrogen ion concentration and lower the pH
lower hydrogen ion concentration and increase the pH
increase the hydrogen ion concentration and increase the pH
increase hydrogen ion concentration and lower the pH
27
The number of protons in an uncharged atom _____.
varies with the different isotopes
equals the total number of electrons in the orbital shells
equals the number of neutrons
equals the number of electrons in the outer orbital
28
If an atom has an extra electron it would be said to be a(n)
positively charged ion
isotope
different element
negatively charged ion
29
The argument that a virus is not alive is because
it has no cells
it doesn't contain DNA
it has no response to stimuli
it doesn't evolve
