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Chemistry
Bonding flashcards
| Question | Answer |
|---|---|
| How does ionic bonding happen? | happens between metals and non-metals |
| What do ionic bonds transfer to make full outer shells? | electrons |
| What type of a charge does an atom has if it GAINS an electron? | negative |
| Do the opposite charges attract in ionic bonding? | Yes |
| What type of a charge does an atom has if it LOSES an electron? | Positive |
| Why do group 1 atoms usually form ionic bonds with group 7 atoms? | because they both gain a full outer shell by gaining/losing 1 electron |
| What type of elements does covalent bonding take place in? | non-metals |
| Why are electrons shared in covalent bonding? | to get a full outer shell of electrons |
| What is metallic bonding? | when metal atoms bond together they are all arranged in uniform layers |
| True or false: there is a sea of delocalised electrons in between the layers in metallic bonding? | true |
| What are properties of giant ionic structures? | High melting and boiling points, do not conduct electricity as solids, do conduct when dissolved in water or are melted |
| Why do giant ionic structures have high boiling and melting points? | strong forces of attraction extend throughout the whole structure, These take a lot of energy to break |
| What are properties of simple covalent molecules? | Low melting and boiling points, Do not conduct electricity |
| Why does simple covalent molecules have low melting and boiling points? | Weak forces between the molecules (Intermolecular forces), break with small amounts of energy |
| What are the 2 main giant covalent molecules we learnt? | Graphite and diamond |
| In graphite, how many other carbon atoms is a each carbon atom bonded to? | 3 |
| In diamond, how many other carbon atoms is a each carbon atom bonded to? | 4 |
| What are some key properties of diamond? | high melting and boiling point, Very hard, cannot conduct electricity |
| What is graphite used for commonly? | pencils |
| How many atoms make up nano particles? | a few hundred atoms |
| What effect does having a smaller structure have on surface area of particles? | they have a bigger surface area |
| What is the problem with using nano-particles? | so small that they're easily absorbed into the body, long term health effects unknown |
| What are fullerenes? | Carbon formed 'nanoparticle' molecules |
| What are smart materials? | Materials that have properties that change when a change happens in their environment |
| Is the change reversible in smart materials? | yes |
| What is the stimuli for thermochromic pigments? | changing temperature |
| What are shape memory alloys? | metal alloys that regain original shape when heated |
Created by:
willum
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