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;
13 Cards in this Set
- Front
- Back
|
what is a chemical symbol |
a one- or two-letter abbreviation for an element |
|
|
What are binary compounds? |
compounds made of only two elements |
|
|
What do the chemical symbols in chemical formulas reveal? |
the amount of atoms present in a molecule |
|
|
What is a subscript? |
the number after the symbol which tells how many atoms of an element are in a compound or molecule |
|
|
What is a chemical bond? |
strong force of attraction that holds atoms of a substance together |
|
|
What are valence electrons? |
the electrons in the outermost energy level of an atom which determine how an atom bonds with other atoms |
|
|
How are valence electrons involved in chemical bonds? |
Only valence electrons will hold or be held together. |
|
|
Using the octet rule, explain what happens when a chlorine atom (7 v. electrons) meets a sodium atom (1 v. electron). |
Chlorine will take the sodium's one atom and they will join |
|
|
What are covalent bonds? |
bond in which valence electrons are shared between atoms |
|
|
How are ions formed? |
they are formed during chemical changes, when atoms lose electrons. |
|
|
How are positive ions formed? |
when a metal atom bonds with other atoms |
|
|
When are negative ions formed? |
When nonmetals bond to other atoms |
|
|
How do ionic compounds act differently from covalent compounds? |
Covalent compounds are formed from covalent bonds and they have low melting and boiling points (can be solid, liquid or gas at room temp)
Ionic compounds are formed from ionic bonds. they are made of charged atoms held together by electrostatic forces. At room temperature, they are solid and they don't conduct electricity until they are dissolved in water. |
