Elements, Compounds And Mixtures Flashcards
What is an atom
An atom is the simplest particle of an element that can exist on its own.
How many atoms does a molecule have
A molecule has 2 or more atoms, joined together, the atoms may be the same or different
ie- molecules of element (2 or more atoms that are identical)
Molecules of a compound (2 or more different atoms)
What are the 2 liquids in the periodic table
Hg and br
Do these element conduct electricity? Aluminium (metal) Zinc (metal) Copper (metal) Iron (metal) Carbon (non metal) Sulfur (non metal)
Aluminium-conducts electricity Zinc-conducts electricity Copper-conducts electricity Iron-conducts electricity Carbon-conducts electricity Sulfur-doesn't conduct electricity
Are these elements shiny or dull? Copper Zinc Aluminium Carbon Sulfur
Copper-shiny Zinc-shiny Aluminium-shiny Carbon-dull Sulfur-dull
Do these elements have high density or low Lead Iron Sulfur Carbon
Lead-high (11.08)
Iron-high (7.76)
Sulfur-low (2.25)
Carbon-low (0.74)
Are these elements hard or brittle
Iron
Sulfur
Iron-hard
Sulfur-brittle
Do these elements have high or low melting points:
Iron
Sulfur
Iron-high (1538 degrees)
Sulfur- low (113 degrees)
Are these elements malleable (can be beaten into shape) or not malleable
Lead
Sulfur
Lead-yes
Sulfur-no
What does brittle mean
Soft
What is electrical conductivity
This is a measure of materials ability to conduct an electric current (allow electricity to flow through it)
What is density
Density is how heavy something is for its size. It’s how massive it is divided by how big it is. So something that’s very heavy and small has a high density. Density is mass divided by volume
What is lustre (shiny)
This is a measure of a materials ability to reflect light
What is meant by the term malleable
A substance is said to be malleable if it can be beaten out of shape without breaking.
What are the conclusions from the experiment to do with density and electrical conductivity etc etc
Metals: Conductors Malleable Metals are hard Metals have high density Metals are shiny
Non metals: Non conductors Not malleable Non metals are brittle Non metals are dull