Chemistry Unit 2

Pregunta	Respuesta
How are compounds formed?	When two or more elements are chemically combined together
What's different about isotopes?	They have extra neutrons
Which type of bonding lose or gain electrons to form ions?	Ionic Bonding
What are charged particles known as?	Ions
Describe the periodic groups/shell which is willing to gain electrons?	A nearly full shell mostly groups 6 and 7
What do ionic compounds always have?	A giant ionic lattice
Why do ions form a closely packed regular lattice arrangement?	There are very strong electrostatic forces of attraction between oppositely charged ions in all directions
Do ionic compounds have a high melting/boiling point or a low melting/boiling point? why?	High melting and boiling point due to the strong attraction between ions
When ionic compounds melt and ions are free to move what can they do?	Carry electric current
What is the overall charge of any compound?	Zero
What is a covalent bond?	Where atoms share electrons with each other so they've got a full outer shell to form strong covalent bonds
What does each covalent bond provide?	One extra shared electron for each atom
What is different about the covalent bond between two oxygen atoms?	They have a double covalent bond
Simple molecular substances don't conduct electricity, what does this mean?	There are no ions, so there's no electrical charge
Simple molecular forces of attraction between molecules are weak. What does this mean?	Due to the inter-molecular forces, melting and boiling points are very low

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