Chemistry for Biologists

Some basic chemistry

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

 

RSC