Week 1- Mixtures and Pure Substances

What does homogenous mixture mean?

Uniform composition throughout

What are examples of homogenous mixtures?

Pure Water, Sugar, Aluminium, Petrol

What does Heterogenous mean?

Having non-uniform composition where small pieces of material can be recognised

What are some examples of Heterogenous?

Strawberry Jam, wood or water with water with ice in it

What must a pure substance be

It must be homogenous

Are homogenous mixtures always a pure substances

No

What are the two things that pure substances may be?

It may be an element or compound

What kind of means can compounds be only separated with?

Chemical means

Can pure substances be further substances by physical means

No

Are pure substances homogenous or heterogenous?

Homogenous

What stays constant throughout the whole sample in pure substances?

The properties

What are examples of pure substances?

Appearance, colour, density

Do the properties in pure substances change? regardless of how it’s prepared or how many times its subjected to purification procedure?

They do not change

What is fixed in pure substances?

Fixed composition

Does the origin or location of the pure substances matter in relation to its composition

No

What are 3 examples of pure substances?

copper, aluminium, diamond, gold

What do mixtures contain?

They contain two or more pure substances

Are the two or more pure substances chemically bonded in mixtures?

No

What means can mixtures be separated?

Physical Means

What are the example of separating mixtures?

Filtering, boiling or using a magnet or tweezers

Are mixtures homogenous or heterogenous?

They can be homogenous or heterogenous

What properties do mixtures display?

It displays the properties of pure substances making the mixtures

What the properties in mixtures can be also described as?

Characteristics

If the mixture has different parts, what characteristics do the mixtures display?

They display properties of the different parts of mixture

How can properties be changed

Properties can be changed depending on the relative amounts of substance

What kind of composition do mixtures have?

It has variable composition

What can be varied in mixtures?

The relatives amounts of pure substances

What are examples of Homogenous Mixtures?

Tap Water and Air

What are examples of heterogenous mixtures?

Fruit Cake and Concrete