Elements, Compounds or Mixtures. What is an Element? A pure substance made up of only one kind of atom.

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Presentation transcript:

Elements, Compounds or Mixtures

What is an Element? A pure substance made up of only one kind of atom

What is a Compound? A substance made from the atoms of two or elements that are chemically bonded

What is a Mixture? A blend of two or more kinds of matter

What is this?

What is a pure substance? Made of only one type of matter. It’s the same throughout the sample. It has definite properties

What are the types of pure substances? Elements and Compounds

What is an Element?

Elements – matter made of all the same types of atoms Chart of Elements is called the Periodic Table Examples: Copper (Cu), Carbon (C), Sodium (Na), Chlorine (Cl)

What is a Compound?

Compounds – matter made of two or more types of atoms (elements) that are bonded together (also called molecules) Most matter in the world is in the form of compounds Examples: Water (H 2 O), Sugar (C 6 H 12 O 6 )

2H 2 O  O 2 + 2H 2

How are Elements and Compounds different? Elements cannot be chemically broken down any further. Compounds can be chemically broken down into Elements.

2Na + Cl 2  2NaCl  ✚

Do elements and compounds have the same properties? Properties of compounds are different from the properties of the elements they are made of. Example: Salt is made from sodium metal and toxic chlorine gas

What is a mixture?

Two or more substances “mixed” together

Do the parts of a mixture lose their properties? NO! There is no bonding in a mixture. The substances in the mixture keep their individual properties.

Can the parts of a mixture be separated? YES! The physical properties of the substances can be used to separate them from the mixture. Example: Salt in water – evaporate the water away and get the salt back

What is a mixture?

Are there different types of mixtures? Yes - Homogeneous and Heterogeneous

What is a homogeneous mixture?

The mixture looks the same throughout. Example: Salt in water – can’t see the salt – looks like clear water coffee, tea, toothpaste,

What is a solution? A type of homogeneous mixture, like salt in water.

Is it easy to separate the parts of a homogeneous mixture? NO! It takes a lot of energy Example: Salt in water – must boil the water away from the salt

What is a heterogeneous mixture?

The mixture does not look the same throughout. You can see the different substances. Example: Oil and Water, Sand and Water

Is it easy to separate the parts of a heterogeneous mixture? YES It does not take a lot of energy. Example: Decant (pour off) the oil way from the water. Filter the sand away from the water.

material_behaviour/compounds_mixtures/activity/

On bottom of page add: Matter Flowchart MATTER Can it be physically separated? Homogeneous Mixture (solution) Heterogeneous MixtureCompound MIXTUREPURE SUBSTANCE yesno Can it be chemically decomposed? noyes Is the composition uniform? noyes ColloidsSuspensions