Chemistry for Biologists

Some basic chemistry

1. How many covalent bonds are there in each molecule of ethane?
7
6
5
4
2. The spatial arrangement of atoms in a molecule are shown by a compound’s
structural formula
molecular formula
empirical formula
3-D displayed formula
3. The empirical formula of a compound shows:
the shape of a molecule of the compound
the ratio of atoms in a molecule of the compound
how the atoms in a molecule of the compound are bonded to one another
how many atoms there are in a molecule of the compound
4. Potassium atoms have the electron arrangement 2,8,8,1. They combine with chlorine atoms to make the ionic compound potassium chloride, KCl. How many electrons are in a potassium ion?
20
21
18
19
5. All carbon atoms have:
one more neutron than protons
the same mass
identical nuclei
the same number of protons
6. The most abundant (% by mass) element in the human body is:
oxygen
carbon
hydrogen
nitrogen
7. Nitrogen atoms can form:
2 bonds
3 bonds
4 bonds
1 bond
8. The electronic structure of an atom describes how its electrons are arranged according to their:
energy
mass
size
charge

 

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