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Descrição
FlashCards por Thomas Pye, atualizado more than 1 year ago
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Criado por Thomas Pye
mais de 8 anos atrás
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| Questão | Responda |
| What are the sub atomic particles in the nucleus of an atom? | PRotons and neutrons |
| Where are electrons found in an atom? | Shells |
| What makes an atom stable? | A full outer shell of electrons |
| Which group of elements on the periodic table are stable? | Group 0/Noble gases |
| What is a compound? | A substance which has atoms of two or more elements chemically bonded together |
| Why do atoms bond together? | To become stable/achieve noble gas electron configuration |
| What is an ion? | A charged particle |
| What charge does the ion have when an tom loses two electrons? | 2+ |
| What charge does the ion have when an tom gains one electron? | -1 |
| What do we call group 1 elements? | Alkali metals |
| What do we call group 7 elements? | Halogens |
| What types of atoms take part in ionic bonding? | Metals and non metals |
| What is an ionic bond? | Strong electrostatic attraction between oppositely charged ions |
| What types of atoms take part in covalent bonding? | Non metals |
| What happens, in terms of electrons, during an ionic bond? | The metal donates electrons to the non metal |
| What happens, in terms of electrons, during a covalent bond? | The non metals share electrons |
| Why can metals conduct electricity? | Delocalised electrons can move through the structure, carrying charge. |
| Why do covalent substances, like water and carbon dioxide, have low boiling points? | Weak intermolecular forces which dont need much energy to overcome |
| Why can covalent substances non conduct electricity? | The molecules do not have a charge |
| Why do ionic substances have high melting points? | A lot of energy is needed to break strong electrostatic forces of attraction |
| Do ionic substances conduct electricity? | Not when they are solid, but they do when they are dissolved in water or are melted |
| What makes an ionic substance conduct electricity? | The ions must be free to move and carry charge |
| How many bonds does each carbon atom make in diamond? | 4 |
| How many bonds does each carbon make in graphite? | 3 |
| What is graphite soft? | Only forms three bonds so they layers can slide over each other |
| Why is diamond hard? | Each carbon forms four covalent bonds which are strong |
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