Biochem Review

Draw a water molecule. Label the atoms and note whether they are partially negatiely or partially positively charged.

The atomic mass is the

• number of protons and neutrons inside the nucleus

• number or electrons or protons

• number of protons, neutrons and electrons

All matter is made of _________.

• energy 
• atoms 
• electrons 
• compounds 

What is at the center of every atom?

• An electron
• A compound
• A molecule
• A nucleus

The positively charged particles of an atom are the ________.

• electrons
• protons
• neutrons
• protons & neutrons

The particles with no charge in an atom are the _______.

• electrons
• neutrons
• protons
• protons and neutrons

What does the nucleus of an atom contain?

• Electrons and neutrons
• Protons and neutrons
• Neutrinos and positrons
• DNA and RN

Why do all bonds form?

• to fill the outermost energy level

• so an atom can be unstable

• so the number of protons and electrons can equal.

• so they can gain neutrons.

An atom with 1 valence electron 'needs' a full shell, so it can either gain 7 electrons or lose 1. Which is more likely to occur?

• nothing

• gain 7

• lose 1

How do covalent bonds form?

• by sharing electrons between atoms

• by donating or receiving electrons