1
A molecule is a substance that cannot be broken down into other substances by standard chemical procedures.
- True
- False
False
2
Which of the following is a trace element required by most living organisms?
- Nitrogen
- Oxygen
- Manganese
- Carbon
Manganese
3
The atoms of different phosphorous isotopes ______________.
- have different numbers of protons
- have different numbers of electrons
- have different numbers of neutrons
- have different atomic numbers
have different numbers of neutrons
4
Hydrogen bonding is most often seen _____.
- if the molecule consists of three or fewer atoms
- when hydrogen is covalently bonded to an electronegative atom
- in molecules whose three-dimensional shape is tetrahedral
- when the bonds within the molecule are nonpolar covalent bonds
when hydrogen is covalently bonded to an electronegative atom
5
Chemical equilibrium is reached when the forward and reverse reactions occur at the same rate so that the concentrations of reactants and products remain the same.
- True
- False
True