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

 

RSC