University:
Winston-Salem Forsyth County Schools
Course:
AP Chemistry
Academic year:

2013
Views:

38

Pages:

22
Author:

Vanessa Gallagher

Instructions • You will be shown different slides. • On page 22 in your notebook, write down the item from each slide and then write whether you think it is a physical or chemical change. • Think about why you decided on your answer and be ready to discuss when we go over them. Frying Eggs Making Toast Cracking Eggs Slicing bread Lighting a Match Roasting Marshmallows Rusting Nails Melting Ice Breaking Glass Boiling Water Making Lemonade Baking a Cake Popping Fireworks Digesting Food in Stomach Mowing the Lawn Everyday Stuff: Chemical and Physical Changes S8P1E. DISTINGUISH BETWEEN CHANGES IN MATTER AS PHYSICAL OR CHEMICAL EQ: HOW DO YOU KNOW IF A PHYSICAL OR CHEMICAL CHANGE HAS TAKEN PLACE? Physical Changes  Physical change is any change in size, shape,      form, or state of matter. All state changes are physical changes! The identity of the matter stays the same only some physical properties change. Most physical changes are reversible Real Life Example: Cutting a watermelon into pieces is a physical change. The watermelon has changed in size and shape, but it’s still watermelon. Give me some examples of physical change Chemical Change  Chemical change is when one type of matter changes into another type of matter with totally     different properties Chemical change is the same as a chemical reaction Whenever something burns, a chemical change is taking place. Most chemical changes are irreversible because totally new substances are formed Real Life Examples: Apple turning brown from leaving it out, leaf changing color in the fall, food that we eat being changed so that our body can use and absorb the nutrients. How do you know when a chemical change has happened?  There is…….  A release or absorption of energy in the form     of light, heat , or sound A formation of a gas after a chemical reaction A formation of a precipitate (solid) after a chemical reaction Often, a change in color . However, this is not always the case. Can you think of exceptions to this one? Give me an example. Give me some examples of chemical change Contrasting Properties and Changes  Physical and chemical properties help identify different types of matter. Example: Density, mass, volume, combustibility, and flammability.  Physical and chemical changes is when the matter changes. Changes are an action. Something is happening. Example: condensation, evaporation, melting, rusting. Answers      Frying Eggs- Chemical Making Toast- Chemical Cracking eggs- Physical Slicing Bread- Physical Lighting MatchChemical  Roasting MarshmallowsChemical  Rusting Nails- Chemical  Melting Ice- Physical  Breaking Glass- Physical  Boiling Water- Physical  Making Lemonade    Physical Baking a Cake- Chemical Popping FireworksChemical Digesting FoodChemical Mowing the LawnPhysical