UNIT THREE: covalent compounds and separation techniques 3.0 / 5 based on 1 rating ? ChemistryGCSEEdexcel Created by: PhoebeCreated on: 01-03-13 14:57 What is the name for the three forms of carbon? The three forms of carbon are known as allotropes. 1 of 20 How many bonds does carbon form in diamond? Carbon forms four bonds in diamond. 2 of 20 How many bonds does carbon form in graphite? Carbon forms three bonds in graphite. 3 of 20 What type of bonding is seen in all forms of carbon? Covalent bonding. 4 of 20 How can carbon-graphite conduct electricity? There are free electrons that can move 5 of 20 What type of elements form a covalent bond? Two non metals 6 of 20 What properties does a simple molecular bond have? Simple covalent compounds have low melting and boiling points 7 of 20 What type of bonding is found in carbon - diamond? Giant Covalent 8 of 20 Which allotrope of carbon does not conduct electricity? Diamond 9 of 20 What is a use of graphite? Lubricant 10 of 20 How many bonds does oxygen form? Two 11 of 20 What is a covalent bond? Shared pair of electrons 12 of 20 Which electron shells are involved in a covalent bond? Outermost shells 13 of 20 What does immiscible mean? The liquids do not dissolve 14 of 20 What is an example of an immiscible mixture? Oil and water 15 of 20 What property allows mixtures to be separated by fractional distillation? Boiling point 16 of 20 Which is the equation for calculating an Rf value? distance moved by the compound/distance moved by the solvent 17 of 20 What substance liquefies at the lowest temperature? Nitrogen 18 of 20 What is the name of the process that separates air into the different gases? Fractional Distillation 19 of 20 What piece of equipment can be used to separate immiscible liquids? Separating funnel 20 of 20
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