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
List some properties of metallic elements
Good conductors of electricity
Usually have high melting and boiling points
Shiny solids
Usually malleable and ductile
Good conductors of heat
All are solids at room temperature except murcury
List some properties of non metallic elements
Poor conductors of heat
Usually have low melting and boiling points
Usually dull
Poor conductors of electricity (graphite is an exception)
Can be a gas, solid, or liquid at room temperature
Non metallic solids tend to be soft and brittle (diamond is an exception)
What is the definition of a compound
A compound is a material that is made up of two or more different elements that are chemically joined together
Name the compound: Element 1=magnesium, Element 2= oxygen Element 1=sodium, Element 2= chlorine Element 1=oxygen, Element 2= iron Element 1=tin, Element 2= oxygen Element 1=aluminium, Element 2= bromine Element 1=nickel, Element 2= iodine Element 1=zinc, Element 2= sulfur Element 1=lithium, Element 2= nitrogen
Compound: Magnesium oxide Sodium chloride Iron oxide Tin oxide Aluminium bromide Nickel iodide Zinc sulfide Lithium nitride
Name the compound: El 1=nickel, el 2=sulfur, el 3=oxygen El 1=magnesium, el 2=nitrogen, el 3=oxygen El 1=sodium, el 2=nitrogen, el 3=oxygen El 1=copper, el 2=sulfur, el 3=oxygen El 1=calcium, el 2=carbon, el 3=oxygen
Compound: Nickel sulphate Magnesium nitrate Sodium nitrate Copper sulfate Calcium carbonate
The formation of magnesium oxide:
Which elements make up magnesium oxide?
Magnesium and oxygen
The formation of magnesium oxide:
How do you make magnesium oxide
Burn magnesium in air
The formation of magnesium oxide:
What do you observe during the experiment
A bright white light
The formation of magnesium oxide:
What does magnesium oxide look like
A white ash
