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