iGCSE Chemistry: Structure & Bonding (Triple)
Terms in this set (23)
Draw a dot and cross diagram to show the arrangement of outer electrons in each of the ions in magnesium chloride, MgCl₂
How can atoms get a full outer shell?
Either the transfer (ionic) or sharing (covalent) of electrons
Explain the term ionic bond
An ionic bond is the strong electrostatic attraction between oppositely charged ions
Describe the structure of an ionic compound, e.g NaCl.
A giant structure held together by the attraction between oppositely charged ions
When can ionic substances conduct electricity?
When molten or dissolved
Describe the formation of a covalent bond
The sharing of a pair of electrons between two nuclei
Give the definition of a covalent bond
Strong electrostatic attraction between a shared pair of electrons and two nuclei
Draw a dot and cross diagram to show the covalent bonding in a molecule of ammonia, NH₃
Explain why carbon dioxide gas, CO₂, is a gas at room temperature
Carbon dioxide has a simple molecular structure with weak intermolecular forces that require little energy to overcome
Do larger molecules have higher or lower boiling points than smaller molecules?
Explain why Silica, SiO₂ is a solid with a high melting point
Silica has a giant covalent structure with many strong covalent bonds that need a lot of energy to break
Explain, in terms of its structure, why graphite can act as a lubricant.
Graphite has weak forces of attraction between layers. These layers can slide over each other
Explain, in terms of its structure, why graphite can conduct electricity.
Graphite has delocalised electrons which can move
Explain what is meant by electric current
The rate of flow of charged particles (e.g. of electrons or ions)
(Triple only) Draw a diagram to show the bonding in a metal
(Triple only) Describe the bonding in a metal
The strong electrostatic attraction between a regular structure of positive ions and a sea of delocalised electrons
(Triple only) Explain why metals are malleable
Metals have layers of ions that can slide over each other
(Triple only) What does the word malleable mean?
Able to be hammered or pressed into shape without breaking or cracking
(Triple only) State whether covalent susbances conduct electricity, and explain why
No. Because there are no charged particles that are free to move
(Triple only) Why do ionic compounds conduct electricity only when molten or in solution?
When solid the ions are held in place. When molten or in solution the ions are free to move
(Triple only) State 2 properties that makes aluminium suitable for manufacturing aircraft
Low density and resists corrosion
(Triple only) What is an alloy?
An alloy is a mixture of a metal and one or more elements, usually other metals or carbon
(Triple only) Alloys contain different sized positive ions. What properties does this give alloys compared to pure metals?
Alloys are harder and less malleable than pure metals
OTHER SETS BY THIS CREATOR
iGCSE Chemistry: Ionic Bonding
iGCSE Chemistry: Specification Experiments
iGCSE Chemistry: Key Calculations (Triple)
iGCSE Chemistry: Equilibria (Triple)
THIS SET IS OFTEN IN FOLDERS WITH...
iGCSE Chemistry: Fundamentals
iGCSE Chemistry: Separating Techniques
iGCSE Chemistry: Key Reactions
iGCSE Chemistry: Simple Molecules & Covalent Bonding