Properties of Metal

Standards:
c. metals have properties in common, such as electrical and thermal conductivity. Some metals, such as aluminum (Al), iron (Fe), nickel (Ni), copper (Cu), silver (Ag), gold (Au), are pure elements while others, such as steel and brass, are composed of a combination of elemental metals.

 

1.  Separating Mixtures Review

Last week you learned the difference between soluble and insoluble mixtures
  • If you mix a solid into a liquid and it dissolves, it is SOLUBLE.

  • If it does not dissolve it is INSOLUBLE.

     

    Which of these is an example of a soluble solution

      baking soda and vinegar
      sand and water
     
    salt and water

    Which of these is an example of an insoluble solution

      sugar and water
      sand and water
     
    salt and water

 

You learned how to separate a soluble solid from a liquid in a solution.

How do you get the salt out of the water in a salt water solution?

  condensation
  evaporation

 

 

2.  What Are Metals?

Remember the periodic table? 

Many of the elements on the periodic table are metals.  They all have certain properties in common. Nickel, copper, iron, silver and gold are all example of metals; they all have common properties.

 

3.  What Are The Properties Of Metals?

Luster = shiny   

Think of chrome hubcaps or a spoon.  They are both shiny metals.

 

Conductor = heat and electricity can travel through it.

If you heat water on the stove, the pot becomes very hot.  The metal pot conducts heat, it allows the heat to travel through it. 

 

High density = heavy 

A bowling ball and a basketball are about the same size and shape, but the bowling ball is heavy for its size.  It has high density.

 

High melting point = it doesn't melt easily. 

You put butter in a pan and heat it on the stove.  The butter melts, but the pan doesn't.  Metals will melt, but only at very high temperatures.

 

Malleable = can be hammered into a different shape.

Think about clay.  You can apply pressure and change it from a lump to a pancake.  Metals can also change shape by applying pressure... a lot of pressure!

 

Corrode = rust 

A nail or tin can that is left outside in the rain will begin to rust and wear away.  This is a chemical change.

4.  Elements and Compounds

You know that many elements on the periodic table are metals, but not all metals are pure elements.  Some metals are compounds (combination of elements).

Remember - an element in made of 1 kind of atom, a compound is made by combining 2 or more different kinds of atoms.

 

5.  How Can You Tell If A Metal Is A Compound?

  If you're not sure if something is a pure element or a compound of elements, you can tell by looking at the periodic table.  If it is on the periodic table, then it is an element.  If it is not on the table, then it is a compound or combination of pure elements.  Find out which of these are pure elements by using the periodic table

iron nickel steel
copper brass gold
silver bronze sterling silver

 

6.  A Few Things To Try

Click here to see a periodic table.

Click here to play Proton Don

 

 

 

 

more molecules to look at

 

 

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