Chemistry for Biologists

Some basic chemistry

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

 

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