Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
11 Cards in this Set
- Front
- Back
|
Define their term- compound |
Atoms of more than one element, chemically joined together by bonds |
|
|
Define their term- molecule |
Distinct groups of atoms joined by covalent bonds |
|
|
Why is water an example of a simple molecular structure |
Because it contains one atom of oxygen covalently bonded to two atoms of hydrogen |
|
|
Define the term - intermolecular forces |
A weak force of attraction between molecules |
|
|
Intermolecular forces hold _______ molecules together and must be overcome by __________ |
Water Evaoration |
|
|
Why do simple molecules have low melting/ boiling points |
Not a lot of energy is needed to over come the weak intermolecular forces |
|
|
Why can’t simple molecules Conduct electricity |
They have no overall charge and so cannot carry an electrical current |
|
|
How are the electrons in a simple molecule held in place |
The strong forces between the negatively charged electrons and the positively charged nucleI |
|
|
Define the term- polymer |
A long chain formed from small molecules called monomers |
|
|
State two features of polymers |
Most polymers contain a chain of monomers Polymers can have different lengths Monomers are usually linked by covalent bond between carbon atoms Polythene is a common polymer made of ethane monomers |
|
|
Why do you longer polymers have high melting and boiling points than shorter ones |
Longer polymers have more intermolecular forces and tend to get tangled up with one another |
