Unit 3
暂无描述。系统推荐的高质量记忆内容，适合每天坚持背诵学习。
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Why is an Ion charged
Because it has an unequal number of protons and electrons
What groups ionic bonding between
Metals and non-metals
What is an ionic bond
Went to ions have opposite charges so they attract each other the force of attraction between them is strong
What form positive ions
Hydrogen and metals
What do non-metals form
Negative ions and their names end in -ide
Why do groups four and five not usually form ions
Because they would have to lose or gain several electrons and that would take too much energy
Why does group 0 not form ions
Because they have a full outer shell already
What type of metals town form more than one ion
Transition metals
What are compound ions
When ions can be formed from groups of joined atoms
What are the properties of an ionic compound
Ionic compounds have high melting and boiling points. This is because ionic bonds are very strong, so it takes a lot of heat energy to break up the lattice. Ionic compounds are usually soluble in water. The water molecules can attract the ions away from the lattice. The ions can then move freely, surrounded by water molecules. Ionic compounds can conduct electricity when they are melted or dissolved. When melted the lattice breaks up on the ions are free to move. Since they are charged, this means they can conduct electricity. The solutions of ionic compounds conduct electricity to because they are also free to move.
What is a lattice?
Ionic lattice structure each positive ion is surrounded by several negative ions
What is covalent bonding between?
Nonmetals only since nonmetals need to gain electrons
What is a single covalent bond
When a pair of electrons are shared
What is a double covalent bond
Two pairs of electrons are shared
What is a triple covalent bond
When 3 Pairs of electrons are shared
What is A covalent compound
When atoms of different elements share electrons with each other
Why are molecules in a covalent bond not flat
Because each electron repel each other and try to get as far apart from each other
What are the solids in a molecular substance
Crystaline
What happens when you cool down and molecular liquid or gas
The molecules lose energy so they start moving slowly and at the freezing point, they form a lattice
What are the properties covalent bonding
Have lower melting and boiling points. This cause the forces between the molecules molecules are weak Do not conduct electricity. This is because molecules are not charged, so they cannot conduct, even when melted
What is a giant covalent structure for a macromolecules
Made of billions of atoms bonded together in a covalent structure
Diamond-giant covalent structure
Diamond is made of carbon atoms held in a strong lattice. Each carbon atom forms a covalent bond to four others. Eventually billions of carbon atoms bond together To form a Crystal of diamond
What are Diamond Properties
Hard because each atom is held by for strong bonds It has a very high melting point because of the strong bonds It can’t conduct electricity because there are no free electrons to carry the charge
What is similar to diamond
Silica