What is an element?
Materials that cannot be split up into anything simpler by chemical methods. Contain only one type of atom
What is an atom?
Simplest particle of an element that can exist on its own
What is a molecule?
2 or more atoms joined together (may be same or different)
How many elements are there approximately ?
100
What are elements represented by?
Symbol e.g. Oxygen is symbolised with an “O”
What is shown on the left hand side of the periodic table?
Metals
What is shown on the right hand side of the periodic table?
Non-metals
Which of the following are conductors of electricity and which are not?
- Aluminium
- Zinc
- Copper
- Iron
- Carbon
- Sulfur
Aluminium - conductor Zinc - conductor Copper - conductor Iron - conductor Carbon - conductor Sulfur - insulator
Which of the following are shiny and which are not?
- Aluminium
- Zinc
- Copper
- Carbon
- Sulfur
Aluminium - shiny Zinc - shiny Copper - shiny Carbon - not shiny Sulfur - not shiny
Which of the following have high densitys and which of the following have low densitys?
- Iron
- Carbon
- Sulfur
- Lead
Iron - high
Carbon - low
Sulfur - low
Lead - high
Which of the following is hard and which of the following is brittle?
- Iron
- Sulfur
Iron - hard
Sulfur - brittle
Which of the following has a high melting point and which of the following has slow melting point?
- Iron
- Sulfur
Iron - high
Sulfur - low
Which of the following is malleable and which of the following is not malleable?
- Iron
- Sulfur
Iron - malleable
Sulfur - not malleable
Which of the following is metals and which of the following is non-metals?
- Aluminium
- Zinc
- Copper
- Carbon
- Sulfur
- lead
- iron
Aluminium - metal Zinc - metal Copper - metal Carbon - non-metal Sulfur - non-metal lead - metal iron - metal
What are the properties of metallic elements?
- good electricity and heat conductors
- shiny solids
- high melting/boiling points
- all solid at room temperature (except Mercury)
- malleable and ductile
What are the properties of non-metallic elements?
- poor electricity and heat conductors
- dull
- low melting/boiling points
- gas, solid or liquid at room temperature
- soft and brittle
What is a compound?
Material made up of two or more different elements chemically joined together
Give two example of compounds
Water and carbon dioxide
If a compound has 1 or more elements in it, what does the phrase usually end in?
-ide
E.g. Iron sulfide (iron and sulfur)
If a compound has 1 or more elements, and water, what does the phrase usually end in?
-ate
E.g. Copper sulfate (copper,Sulfur and oxygen)
Which elements make up magnesium oxide?
Magnesium and oxygen
How do you make magnesium oxide?
Burn magnesium in air
What do you observe during the magnesium oxide experiment?
Bright white light
What does magnesium oxide look like?
White ash
What is the word equation for magnesium oxide?
Magnesium + oxygen -> magnesium oxide
Which elements make up iron sulfide?
Iron and sulfur
How do you make iron sulfide?
Heat mixture of iron and sulfur
What do you observe during the iron sulfide experiment?
Mixture glows
What does iron sulfide look like?
Black solid
What is the word equation for iron sulfide?
Iron + sulfur -> iron sulfide
What is a mixture?
Two or more substances mixed together that are easy to separate
What do compounds have completely different from the elements that are used to make them?
Completely different properties
What is the appearance of iron?
Grey, shiny solid
What is the appearance of sulfur?
Yellow, dull powder
What is the appearance of iron-sulfur mixture?
Grey and yellow flecks
What is the appearance of iron sulfide?
Dark, grey solid (not shiny)
Which of the following are magnetic or non- magnetic?
- iron
- sulfur
- iron-sulfur mixture
- iron sulfide
Iron - magnetic
Sulfur - non-magnetic
Iron-sulfur mixture - iron(magnetic) sulfur(non-magnetic)
Iron sulfide - non-magnetic
Which of the following are soluble or insoluble in Xylene?
- iron
- sulfur
- iron-sulfur mixture
- iron sulfide
iron - insoluble
sulfur - soluble
iron-sulfur mixture - iron(^^^) sulfur(^^^)
iron sulfide - insoluble
What are observations of the following elements when added to acid?
- iron
- sulfur
- iron-sulfur mixture
- iron sulfide
iron - bubbles
sulfur - no reaction
iron-sulfur mixture - bubbles
iron sulfide - rotten egg smell
Different elements have…
Different properties
In a mixuture, what way do elements behave?
As if they were on their own
What word do scientists use when they talk about the world around us?
Material e.g. The wood in a tree
What does malleable mean?
Can be bent into shape
What is the state of water and what elements are present?
- Liquid
- hydrogen and oxygen
What is the state of carbon dioxide and what are the elements present?
- gas
- carbon and oxygen
What is the state of sodium chloride and what are the elements present?
- solid
- sodium and chlorine
What is the state of hydrogen?
Gas
What is the state of oxygen?
Gas
What is the state of carbon?
Gas
What is the state of sodium?
Solid
What is the state of chlorine?
Gas