Module 2 Pure Substances and Mixtures Section 4.1- Matter in Your World

Starting point activity (p. 99) Mixed or Pure? Task: Find the differences between these pairs: Glass & Steel Water & Milk Gasoline & Oil

Glass and Steel Resemblances: Solid Construction materials Can be melted Cannot bend in original state (without being melted) Differences: Color (glass is transparent, steel is grey) Weight (steel is heavier, if the size is the same) Steel (metal) can conduct electricity Glass is fragile, steel is not easily broken

Water and Milk : Resemblances: Liquid They can freeze and evaporate We can drink them Good for our health Nonflammable (cannot catch fire) Differences: Color (water is clear, milk has color) Water is transparent, milk is not Water is more widespread on earth (2/3) Water is naturally on Earth, milk comes from cows Milk is thicker than water

Gasoline and Oil Resemblances: Liquid Transparent Combustible (can catch on fire) Mixture (not pure substances) Differences: Color (oil has color, gasoline is clear) Smell Oil is thicker than gasoline Gasoline is what we put in our cars Cooking oil can be used in a kitchen

Section 4.1 Matter in Your World

Matter: any material that occupies space and has a mass (includes all solids, liquids, and gases). Properties: the characteristics that are used to describe matter. Examples: size, shape, form, state, smell, color, taste,. *Every material has its own set of properties.

Example Water at the beach (photo on page 98) has the following properties: Clear, liquid colorless odorless Freezes at 0º C * (under normal conditions) Boils at 100º C

Some materials cannot be described by a single set of properties. Mixture: a material that has more than one set of properties. It contains more than one kind of matter combined in such a way that it keeps its own set of properties.

Heterogeneous or Homogeneous? Heterogeneous: means made up of parts, or mixed. A heterogeneous mixture is made up of parts that can be seen and observed. Homogeneous : means every part of the material is the same. There is only one set of properties.

Heterogeneous or Homogeneous? What do you think? Water with salt in it Apple juice Peanut butter Salt and pepper mixed together Smoothie Orange juice with pulp Pure water

A Classified Photograph- Activity p Study the photograph on p Make a table (like the one on p. 101) Find substances in the image Classify whether each material is heterogeneous or homogeneous Use your personal experience to help you decide Record your decision in the second column of your table In the third column, identify what made you decide (observations).

Quiz 4.1 The quiz on section 4.1 : 5 definitions (matter, properties, homogeneous, heterogeneous, mixture) Examples

Study time!! Study your 5 definitions (matter, properties, mixture, homogeneous, heterogeneous) Write them down! Study with a partner (no laptops) Make a list of as many properties as you can think of.