chemistry-bonding
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- Created by: Chloehoughton15
- Created on: 28-04-17 10:15
what is the difference in mixing two substances and reacting them?
When you mix two substance together neither of the substances change however when you react two substances a new product is formed and cannot easily be separated.
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what happens in ionic bonding?
The atoms involved either lose or gain electrons.
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when are ionic compounds usually formed?
when a metal reacts with a non metal.
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How are the ions formed in ionic bonding held to each other?
By enormously strong forces of attraction between oppositly charged ions.
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What name do we give the arrangement of ions in an ionic compound?
A giant structure.
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Why are the ions in a lattice held so strongly together?
Because the force exerted by an ion on the other ions acts equally in all directions.
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What is the bond called when two atoms share electrons?
covalent bonding
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when are covalent bonds usually formed?
When to non-metals react together.
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When non-metals are reacted together why can neither give away electrons?
because non-metals generally need to gain electrons.
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How are the atoms held together in covalent bonding?
they are held together as they are sharing pairs of electrons.
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What are giant structures?
Where a huge number of atoms are held tightly by a network of covalent bonds.
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How are the atoms in metals held together?
The outer electrons in each atom can easily move from one atom to the next one. The outer electrons for a sea of delocalised electrons surrounding positivly charged metal ions. The strong electrostatic attraction bonds the metal ions together.
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How are atoms in metals arranged?
metals are another example of giant structures.
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What type of force holds the ions together in an ionic compound?
Electrostatic forces
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Do ionic compound have a high or low melting and boiling point?
High melting and boiling point
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Why do ionic compounds have a high melting and boiling point?
Because it takes alot of energy to break the lattice apart, due to the very strong sttractive forces of the oppositly charged ions.
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Why can a solid ionic compound not conduct electricity?
Because each ion is held in a fixed position in the lattice and cannot move around.
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Why can ionic compounds conduct electricity if in molten or dissolved in water?
Because the ions are free to move anywhere and are able to carry the electrical charge.
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Can ionic compounds conduct electricity?
Not in solid form , however yes when in molten or dissolved in water.
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Do simple covalent bonds have a high or low melting and boiling point?
Low melting and boiling points.
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Why do simple covalent bonds have a low melting and boiling point?
Covalent bonds are very strong, however each molecule tends to be quite seperate from its neighbouring molecules. Therefore there are weak intermolecular forces, and overcoming these forces does not take much energy.
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So simple molecules conduct electricity?
No, not even in liquid form.
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Why do simple molecules not conduct electricity?
Because there is no overall charge on the molecules in a compound, the molecules cannot carry electrical charge.
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Do Giant covalent substances have a high or low melting and boiling point?
High melting and boiling points
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Why do Giant covalent structures have a high boiling and melting point?
All the atoms are held tightly together by strong covalent bonds.
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Why is graphite slippery?
The carbon atoms are arranged in giant layers. There are only weak forces between the layers so they can slide over each other easily.
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Do giant covalent substances copnduct electricity?
Most do not with the exception of graphite.
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Why is graphite able to conduct electricity?
The carbon atoms in graphites layers are arranged in hexagons so each carbon bonds to 3 others. This leaves one spare outer electron, this electron becomes delocalised among the layers.
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What is a fullerene?
There are other different molecules that carbon can produce. In these structures the carbon atoms join together to make large cages.
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Are Giant metallic structure good or bad at conducting heat?
Very good at conducting heat
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Why can metals be bent and shaped when force is applied?
Because the layers of atoms in pure metal are able to slide easily over each other.
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Why do metals conduct heat and electricity?
As a direct result of the ability of the delocalised electrons to flow through the giant metallic lattice.
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What is nanoscience?
The science of really tiny things.
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What are some of the uses of nanoscience?
Self-cleaning glass, sunscreens, cosmetics, deloiver
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Other cards in this set
Card 2
Front
what happens in ionic bonding?
Back
The atoms involved either lose or gain electrons.
Card 3
Front
when are ionic compounds usually formed?
Back
Card 4
Front
How are the ions formed in ionic bonding held to each other?
Back
Card 5
Front
What name do we give the arrangement of ions in an ionic compound?
Back
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