11588238
Beschreibung
Karteikarten von Olivia Agbe, aktualisiert more than 1 year ago
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Erstellt von Olivia Agbe
vor etwa 7 Jahre
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| Frage | Antworten |
| What are the alkali metals | The alkali metals are in group1 of the periodic table and they are metals |
| Properties of Alkali metals | They are soft.They are shiny but air changes them to dull grey colour-Oxidation- metals react with oxygen to make metal oxides.Low density. They are good thermal and electrical conductors. |
| Reactivity of Alkali Metals | The further down the group you go,the softer they are. |
| What do Alkali Metals form? | They form iconic compounds. eg ... Sodium chloride.They form ions in a single postive ion eg... Na+e- |
| What elements from group 1 float in water? | Lithium,Sodium and pottasium |
| They get darker as you go down the group.The melting and boiling points increase as you go down the group.Reactivity decreases as you go down the group. They form ionic bonds which change them into a halide ion. | Reactivity of Halogens |
| Properties of Transtion elements | They are hard/strong metals. They have high melting points.They have coloured compounds.They have high densities.They can form ions with different charges. |
| Reactivity of Transition Elements. | They are less reactive than group 1. |
| What are the five main physical separation techniques? | Filtration,Simple Distillation,Fractional Distillation,Crystalistion and Chromotography |
| What is Filtration used for? | This is to separate an insoluble solid from water. |
| What is Crystalisation used for? | This to separate a soluble solid from a liquid. |
| What is Simple Distillation used for? | This is to separate a liquid from solid whilst keeping the liquid. |
| What is Fractional Distillation used for? | This is to separate a mixture of different liquids but the liquids must have different boiling points. |
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