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
molecular formula
structural formula
empirical formula
3-D displayed formula
3. 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
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?
18
19
20
21
5. The most abundant (% by mass) element in the human body is:
oxygen
nitrogen
carbon
hydrogen
6. Nitrogen atoms can form:
4 bonds
2 bonds
3 bonds
1 bond
7. The electronic structure of an atom describes how its electrons are arranged according to their:
energy
mass
size
charge
8. All carbon atoms have:
one more neutron than protons
identical nuclei
the same mass
the same number of protons

 

RSC