chemistry bonding 0.0 / 5 ? ChemistryNanoscienceGCSEAll boards Created by: Jennie1234Created on: 27-11-16 18:19 Which atoms usually gain electrons to form negative ions? Non-metal atoms 1 of 21 Metal atoms form: Metal atoms form positive ions by losing electrons. 2 of 21 ionic bonding? An ionic bond is the electrostatic force of attraction between oppositely charged ions. 3 of 21 Sodium chloride conducts electricity when: Sodium chloride conducts electricity when molten or in solution. 4 of 21 The structure of magnesium oxide is a: giant ionic lattice. 5 of 21 Why does sodium chloride have a lower melting point than magnesium chloride? Sodium ions are larger and have a smaller charge than magnesium ions, so the ionic bonds are weaker. 6 of 21 How many electrons are involved in each covalent bond? Two 7 of 21 Which sort of elements form covalent bonds? Non-metals form covalent bonds. 8 of 21 What does a covalent bond involve? A covalent bond involves sharing electrons between atoms. 9 of 21 Where do the electrons in a covalent bond come from? The highest occupied energy level 10 of 21 How many covalent bonds are there in an ammonia molecule? In an ammonia molecule there are three bonds. 11 of 21 What type of structure do diamond and graphite have? Giant molecular structure 12 of 21 Why might fullerenes be used in new drug delivery systems? They are hollow 13 of 21 In what physical state or states do ionic substances conduct electricity? Liquid or dissolved in water 14 of 21 How does the structure of nanotubes make them suitable as catalysts? Nanotubes have a large surface area. 15 of 21 What type of bonding is present in metals? Metallic bonding 16 of 21 Polymers with cross-links are: Thermosetting polymers 17 of 21 Copper is used to make electrical wiring because it is: Copper is used for electrical wiring as it is a good conductor of electricity. 18 of 21 What is the approximate size of a typical nanoparticle? A nanopartical is approximately 50 nm. 19 of 21 Metals conduct electricity because They contain electrons that are free to move 20 of 21 In what physical state or states do ionic substances conduct electricity? Liquid or dissolved in water 21 of 21
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