Write 2 examples of physical change and 2 examples of chemical change. October 21, 2015 Day 1 1. Please have these Items on your desk. Science Starters Sheet notebook Agenda Science Starter: https://www.youtube.com/watch?v=uJOGy0dgmUU https://www.youtube.com/watch?v=X328AWaJXvI Write 2 examples of physical change and 2 examples of chemical change.

The look of Science Fair Friday-Data Chart & Graph due

Evidence of Chemical Reactions Chemical Reaction: The process by which the atoms of one or more substances are rearranged to form different substances. Temperature change Color change Gas or solid appears

4. An energy change (Temperature) Endothermic reaction-a chemical reaction accompanied by the absorption of heat. Exothermic reaction-a chemical reaction that releases energy. The energy “ex”its. It is the opposite of an endothermic reaction. https://www.youtube.com/watch?v=L-G7pLufXAo

Example of everyday endothermic reactions https://www.youtube.com/watch?v=7q04F-juT-c

Examples of everyday exothermic reactions

Chemical Changes Atoms are re-arranged, NOT created or destroyed

Law of Conservation of Matter Matter is conserved  type of atoms does not change Nothing is created or destroyed

Change of Matter::::Physical change: Identity Retained. 
This type involves a change in the observable properties of matter without a change of the substance identity.  In most physical change of matter, no bonds are broken between atoms and the identity of the substance is retained. Example:  Phase Change  
In a phase change matter changes from solid, liquid or solid but the identity of the substance is retained. 
 

Change of Matter:::::Chemical change: Identity Changed 
This type of change refers to a material changing to a completely different type of material or transformation to a new substance. This process involves bond breaking and bond forming such that material changes identity. 
  Example:  Decomposition of water. In the decomposition of water, water molecules H2O are broken down to hydrogen and oxygen.

Consider the following examples, which of these are phyiscal and which are chemical change Heating sugar vs. adding sugar to water Cutting wood vs. burning wood. 3. The electrolysis of water vs. ice melting.

Answers. . . . . . . .. Physical Change Chemical Change 1. Sugar dissolving Sugar heating 2. Cutting Wood Burning Wood 3. Melting Ice Electrolysis of water