December 12, 2016 Today in Class you will need: Pen/ Pencil

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Presentation transcript:

December 12, 2016 Today in Class you will need: Pen/ Pencil Paper/ Notebook Today’s Schedule: Matter Continued

Q & A When doing density problems what are the units that represent volume, mass, and density? Volume= ml or cm3 Mass= g Density= g/ml, or g/cm3

Matter Cont’d Other than Physical Properties, matter also has Chemical Properties. Chemical Properties can only be observed when one substance can interact with another. Ex: Dynamite + Flame + Oxygen= Explosion (Combustion)

Matter... Reaction with Acid: ability of a substance to react with acid. Ex: Magnesium + Acid = Gas + Metal Disappears (Reaction) Gold + Acid= No Change (No Reaction)

Q/A- Physical or Chemical Property Blue colour Flammability Boils at 100 degrees Reacts with H2O to form gas Hardness Rusting

Physical Change Physical Changes occur when matter changes its property but not its chemical nature. Include: Texture, shape, size, colour, volume, mass, density, weight

Physical Changes

Chemical Changes Chemical Changes occur when matter becomes something new or different. Ex: Fireworks- are metals like magnesium and copper. These go through a chemical change to light up the sky. The Chemistry of Fireworks

Chemical Change or Physical Change What happens when stuff dissolves?

Clues That it is a Chemical Change Heat or Light is given off A new colour appears Bubbles of gas are formed

A solid material (called a precipitate) forms in a liquid The Change is difficult to reverse. i.e. Fire

Demo Exit Question Hypothesis: (Pre) Chemical Change: (Post) Write down an hypothesis regarding what you think is going to happen when hydrogen peroxide solution mixes with the yeast solution. Chemical Change: (Post) How do we know this is a chemical change?