True-False Quiz - Biochemistry:
 
True / False
Statement
 

In terms of subatomic particles, electrons are positive, neutrons are negative, and protons are neutral.
 

Valence electrons are those found in the innermost energy level of an atom.
 

The first energy level of an atom can hold a maximum of 8 electrons.
 

The atomic number of nitrogen is 7 and this gives the number of protons or neutrons in a neutral atom.
 

Carbon atoms have an atomic number = 6 and a valence = 4.
 
True / False
Statement
 

Lewis diagrams show only valence electrons of an atom and not all electrons in all energy levels.
 

Valence electrons are the electrons involved in chemical bonding.
 

An ionic bond is formed when ions such as Na+ and Cl- share electrons equally.
 

All of the following molecules have non-polar covalent bonds: H-H, Cl-Cl, H2O.
 

According to the 2n2 equation, the 3rd energy level can hold a maximum of 18 electrons.
 
True / False
Statement
 

The isotope Carbon-14 has 2 more protons than Carbon-12.
 

Hydrogen bonds can form between: H and O, H and N.
 

-NH2 is called an amino group.
 

CH3-OH would be an example of an aldehyde.
 

Hydrocarbons only contain the elements: C, H, and O.
 
True / False
Statement
 

H+ ions are released by acids such as NaOH.
 

OH- ions are released by bases and they increase the pH of a solution.
 

A neutralization reaction is one in which an acid and a base react to produce a salt and alcohol.
 

The greater the electronegativity difference between 2 atoms, the more likely the chemical bond formed will be ionic.
 

CH3-O-CH3 is di-ethyl ether.