7108861
Descripción
Fichas por Anushka John, actualizado hace más de 1 año
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Creado por Anushka John
hace más de 7 años
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| Pregunta | Respuesta |
| Atomic radius ________ as you go down the group. This is because... | Increases Because as you go down the group, the number of electron shells increases so the distance of the outer electron to the nucleus also increases |
| Melting point ________ as you go down the group. The __________ bonding weakens as the atom size ________. | Decreases metallic bonding atom size increases so there is a greater distance between the delocalised electrons and the positive ion nucleus; weaker electrostatic forces of attraction. |
| What happens to 1st ionisation energy as you go down Group 2 | *Decrease *atom size increases so the outermost electron is successively further away from the nucleus. *more shielding as you go down the group, so less electrostatic attraction. |
| The reactivity of Group 2 metals ________ as you go down the group | Increases as outermost electron further away and more shielded, so less electrostatic attraction, so easier to lose. |
| Why, when using magnesium ribbon, should you wipe it down with emery paper before using it in an experiment? Include equations | Because Mg reacts slowly with O2 without a flame. 2Mg + O2 --> 2MgO leaving a layer of MgO on the surface. If used in a reaction, both Mg and MgO may react. Both have different reaction times and different products, giving a false result. Mg + HCl --> MgCl2 + H2 MgO + HCl --> MgCl2 +H2O |
| Do group 2 metals burn in oxygen? | Yes they do. *Mg burn with white flame |
| What colour is MgO? What bonding? High or low boiling point? | MgO is a white solid High melting and boiling point due to its ionic bonding |
| Magnesium reacts differently in steam and warm water. Give the equation for its reaction with steam. | Mg (s) + H20 (g) -->MgO (s) + H2 (g) |
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