Chemistry Review

Which of the following is described as the basic unit of matter?

• Element
• Atom
• Molecule
• Compound

A molecule is________

• two ions held together by opposite charges
• smaller than an atom
• can be physically separated into smaller atoms
• more than one atom bonded together by covalent bonds

In chemical compounds, covalent bonds form when

• the electronegativity difference between two atoms is very large.
• electrons are completely transferred between two atoms.
• pairs of electrons are shared between two atoms.
• ions are held together by opposite charges.

An electron is located ...

• in the nucleus.

• outside the nucleus.

consists of one type of atom

• element

• compound

• mixture

Which statement about liquids is correct?

• They have a fixed shape and a fixed volume.

• They have a fixed shape but not a fixed volume.

• They have no fixed shape but they do have a fixed volume.

• They have no fixed shape and no fixed volume.

Is salt (NaCl) an element, compound, or mixture?

• Element

• Mixture

• Compound

How many Protons does a Carbon atom have?

• 12

• 6

• 18

• 14

What is a "Valence Shell"

• The first electron shell

• The outermost electron shell

• Any full electron shell

if METALS are more likely to LOSE electrons, they will form ...

• anions
• neutral atoms
• positive ions
• negative ions