Structure Flashcards
What are molecules
Non-metal atoms joined by covalent bonds
What are the two types of substances
Giant structures and molecular structures
What are the properties of molecular solids
Low melting and boiling points
Don’t conduct electricity
What are alloys
An alloy is a mixture of metals
What is an ion
An atom or group of atoms that carry an electrical charge
What do all ionic compounds consist of
They consist of huge lattices of positive and negative ions packed together in a regular way.
What are the properties of diamond
Very hard
High melting and boiling point
Doesn’t conduct electricity
Doesn’t dissolve in water
- strong carbon to carbon covalent bonds
What are the properties of graphite
Soft material with a slimy feel High melting a boiling points Insoluble in any solvents Less dense than diamond Conducts electricity
What are the basic properties of simple molecular structures
Low melting points
Insoluble with water unless reacted with it
Soluble in organic solvents
Don’t conduct electricity
What is an element
Substances that can’t be split ini anything more simple by chemical means
What is a compound
Made from a combination of two it more elements in fixed proportion, joined by strong bonds
What is a mixture
The various components can be in any proportions.
Name the differences between mixtures and compounds
Proportions
Properties
Ease of separation
Energy changes
