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Chemistry
Unit 1 - Part 1
| Question | Answer |
|---|---|
| What are all elements made up of? | Atoms |
| What is the centre of an atom called? | Nucleus |
| What are the three sub-atomic particles called? | Protons, Electrons, Neutrons |
| What are the two sub-atomic particles in the nucleus? | Protons, Neutrons |
| Where are the electrons found? | Circling the nucleus on energy levels. |
| Why are atoms neutral? | The number of protons equals the number of electrons. |
| What is the atomic number? | It equals to the number of protons in the atom. |
| What is the atomic mass? | It equals to the number of protons + number of neutrons |
| How are electrons arranged? | In energy levels round the nucleus. |
| How many electrons can the first energy level hold? | 2 |
| How many electrons can the second energy level hold? | 8 |
| What is Isotopes? | Atoms of the same element but with a different number of neutrons. |
| Explain Covalent Bonding | It is the sharing of electrons to make two atoms stable. |
| What are the 7 diatomic molecules? | Hydrogen, Oxygen, Nitrogen, Fluorine, Chlorine, Bromine, Iodine |
| What diatomic molecules have a single bond? | Hydrogen, Fluorine, Chlorine, Bromine, Iodine |
| What diatomic molecules have a double bond? | Oxygen |
| What diatomic molecules have a triple bond? | Nitrogen |
| What is a molecule? | It is two or more atoms held together by covalent bonds. |
| Do metals form covalent bonds? | No, only non-metals form covalent bonds. |
| What are the valencies of Groups 1,2,3,4,5,6 and 7? | Group 1= 1 Group 2= 2 Group 3= 3 Group 4= 4 Group 5= 3 Group 6= 2 Group 7= 1 |
| What is the prefix of 1 atom? | mon- |
| What is the prefix of 2 atoms? | di- |
| What is the prefix of 3 atoms? | tri- |
| What is the prefix of 4 atoms? | tetra- |
| What is the prefix of 5 atoms? | penta- |
| What is the prefix of 6 atoms? | hexa- |
| What is the prefix of 7 atoms? | hepta |
| What is the prefix of 8 atoms? | octa |
| What is the prefix of 9 atoms? | nona |
| What is the prefix of 10 atoms? | deca |
| Explain Conductor | A material that allows the flow of electricity. |
| Explain non-conductor (or insulator) | A material that does not allow the flow of electricity. |
| Explain Metallic Bonding | Strong attraction between closely packed positive metal ions and a 'sea' of delocalised electrons. The attraction between the metal ions and the delocalised electrons must be overcome to melt or to boil a metal. |
| For an electric current to flow, what are the two things needed? | -Charged Particles -The charged particles must be able to move |
| Explain Ionic Bonding | It is when non-metals steal electrons from metals. Non-metals gain electrons Metals lose electrons |
| What are the charged particles in an ionic compound called? | Ions |
| What is Electrolysis? | It is the breaking up of a compound using electricity. |
| What is Electrolyte? | A liquid that conducts electricity by the movement of ions. |
| What are covalent networks? | A few covalent compounds such as silicon dioxide that have very high melting points. |
Created by:
kiran_iqbal
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