Lesson 4- Ionic Compounds Flashcards
TRUE OF FALSE: Atoms are most stable when the have a FULL valence energy level
TRUE
What is 1 way of achiving a full valence shell?
by gaining or losing electron
When an atom gains or loses electrons, it becomes a_____
ion
crystal lattice
The ions in an ionic compound are locked in a regular structure
melting point
is the temperature at which it changes from a solid to a liquid
Do ionic compouds have high or low melting points? And why?
onic compounds have relatively high melting points because their ions are held together by strong electrostatic forces (ionic bonds)
Explain how ionci compounds are hard but brittle?
Held together by the attraction of oppositely charged ions (electrostatic forces)
Resistant to being stretched or compressed
HOWEVER, if struck, ions become distorted and repel one another causing the crystal to break or shatter
How do ionic compounds react in water
When an ionic crystal is placed in water, water molecules surround each ion and separate it from the crystal
How does an ionic compounds conductibvity react when put in water
- conducts and electric current
When an ionic compound is dissolved in water (ie. it’s aqueous form), the result is….
an electrolyte
The dissolved ions are able to move…
Freely, and thus to carry electric charges, through the water
What simialr traits do most ionic compounds share?
State at room temperature- Solid
Melting/Boiling point- High
Solubility in water -High
Electrical conductivity as a solid- None
Electrical conductivity when dissolved in water (aqueous- high
