Chemistry Do Now 2-14-19 Directions: Take out a sheet of notebook paper. Answer the following question. (5 minutes). Write down 2 physical and 2 chemical properties for this bottle of water.  

Chemistry Do Now 2-14-19 Physical Properties of water Freezes at 0 degrees Celsius Boils at 100 degree Celsius Chemical Properties of water Reacts violently with strong acids Reacts violently with strong bases  

Students will know how matter is classified by taking notes, completing a double entry journal and a worksheet on properties/changes in states of matter. Mastery Level: 75% or better Objective

Students identify 5 pure substances and 5 mixtures in their everyday life and include explanations for why they think a substance is “pure” or a mixture. Homework

Engage Yesterday we looked at the physical and chemical properties of matter. Now look at the image below and explain what is happening. Do you think this is an example of a physical or chemical change? Why?  

Explore Students will complete the reading of an article “Physical and Chemical Properties of Matter” DEJ and will answer the questions to the right of the paragraphs.

Physical and Chemical Properties and Changes

Physical Changes a change that occurs changing the of the substance. ____ new substances are formed. without identity No

Examples of Physical Changes Change in size, shape, or color Pencil shavings Torn Paper Crushed ice Sugar dissolved in water Painting a wall

Chemical Changes a change that occurs that the of a substance to change; something is formed. New substances with properties are formed causes identity new new

Evidence of Chemical Change New ________appears Bubbbles or ________ Precipitate forms (____ material) color _____ is produced ______ is produced ______ is given off Heat fizzing Light Sound solid Difficult or impossible to __________ reverse

Reactions with Acid Vinegar + baking soda = release of Carbon Dioxide Gas

Reactions with Oxygen OXIDATION Iron + Oxygen = rust

Reactions with Electricity Silver Plating

Reactions between Substances Sodium + chloride = salt Silver + sulfer in the air = tarnish

Other Examples Wood burning Metal rusting Food digesting Gasoline burning Cake baking

Physical or Chemical Change? Water evaporates from the ocean.

Physical or Chemical Change? The yolk of an egg, which contains sulfur, causes tarnish to form on silver.

Physical or Chemical Change? The ice on a lake melts to become water in the lake.

Physical or Chemical Change? Charcoal in a fire turns to ash after several hours.

Physical or Chemical Change? A pencil is sharpened in a pencil sharpener, leaving behind shavings.

Physical or Chemical Change? A battery makes electricity to turn on a flashlight.

Physical or Chemical Change? A bicycle rusts when left in the rain.

Physical or Chemical Change? A shirt is accidentally torn in the washing machine.

Physical or Chemical Change? A log is split in two by an axe.

Your Turn! Complete the section of the worksheet on physical and chemical changes of matter from yesterday.