What determines if a molecule is polar, nonpolar, or ionic?

C. The differences in the electronegativities of the atoms

B. the change in the genetic makeup of a population through time

Which of the following statements about covalent bonds is false?

C. Only a single covalent bond can form between two atoms

Which of the following occurs when a covalent bond forms?

B. Electrons in valance shells are shared between nuclei

The ability of atoms to combine with other atoms is determined by

C. the number and distribution of electrons.

Which of the following is not true about the periodic table?

C. The mass number is found by adding the number of protons and electrons

Covid 19 spikes bind specifically to their receptor. Relate to overarching bio theme:

A. structure determines function

Which is NOT true about evolution?

Evolution only occurs slowly and gradually

Depending on how the atoms satisfy this simple octet rule will allow the prediction of

A. chemical behavior of the atoms

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SI Session 2

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Questions 20

Answers

1
What determines if a molecule is polar, nonpolar, or ionic?
B. The bond distances
C. The differences in the electronegativities of the atoms
D. The ionic charges
A. The number of protons
2
"Homo" falls into which taxonomic group for humans:
B. Genus
A. Domain
D. Species
C. Class
3
Where does most of the mass of a piece of wood come from?
C. Air
B. Water
D. Soil
A. Sun
4
Water is extremely important in living things for all of the following reasons except
D. it is a good solvent; most things dissolve in it.
C. it has high specific heat and resists temperature change.
B. it is an excellent buffer.
A. it adheres to substances (wets them) because it is polar.
5
Evolution is
B. the change in the genetic makeup of a population through time
C. only a theory
D. not influenced by natural selection
A. the change in the genetic makeup of an individual through time
6
Which of the following is NOT needed for evolution to take place?
C. Time
A. Identical genetics
B. Natural selection
D. Heredity
7
Which of the following statements about covalent bonds is false?
D. A covalent bond results from the sharing of electrons by two atoms
C. Only a single covalent bond can form between two atoms
A covalent bond is stronger than a hydrogen bond
B. A covalent bond can form between atoms of the same element
8
A procedure causes nitrogen atoms to gain neutrons. The resulting atoms will be
D. isotopes of nitrogen
C. negatively charged
A. ions of nitrogen
B. positively charged
9
Atoms have a dense nucleus which contains neutrons and ___________.
C. Hydrogen
B. Electrons
D. Oxygen
A. protons
10
How many times more concentrated is the H+ in cola (pH 3) than coffee (pH 5)?
C. 15 times
D. 100 times
B. 10 times
1. 2 times
11
The atomic number of an element equals the number of
B. Neutrons in an atom
D .Neutrons plus the number of protons
C. Protons minus the number of neutrons
A. protons in an atom
12
Which of the following occurs when a covalent bond forms?
D. Polar molecules interact
A. The potential energy of electrons drops
B. Electrons in valance shells are shared between nuclei
C. Ions of opposite charge interact
13
The ability of atoms to combine with other atoms is determined by
C. the number and distribution of electrons.
A. the atom’s atomic weight.
B. the atom’s ability to form isomers.
D. pH
14
What is NOT a characteristic of Darwin’s theory of evolution by natural selection?
Differential reproduction
Heredity
Genetic drift
Variation of traits
15
Which of the following is not true about the periodic table?
D. The atomic number is the number of protons
A. Elements in a group have the same number of valence electrons
B. Elements are ordered by increasing atomic number
C. The mass number is found by adding the number of protons and electrons
16
Covid 19 spikes bind specifically to their receptor. Relate to overarching bio theme:
D. living systems depend on information transactions.
A. structure determines function
B. life is based on energy transitions
C. evolution explains unity and diversity
17
Cholesterol is composed of carbon and hydrogen atoms. One would expect cholesterol to be
A. insoluble in water
D. A buffer
C. An acid
B. A polar molecule
18
Which is NOT true about evolution?
Evolution is a mixture of random and non-random selection
Natural selection results in evolution
Evolution only occurs slowly and gradually
Genetic drift happens in large and small populations
19
Depending on how the atoms satisfy this simple octet rule will allow the prediction of
B. whether they will be found in nature
D. their radioactive energy
A. chemical behavior of the atoms
C. whether they will dissolve in water
20
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Fine.
Help
I really should study more
Pretty good

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