3.3 Physical and Chemical Changes Pages 86-90 By Lester Green Smallwood Academy Gambo

1.24 Describe changes in the properties of materials that result from some common chemical changes. See text pages 88-89

1.24.1 Distinguish between physical and chemical changes. Physical Change Occurs when there is a change in matter (state: solid, liquid or gas) There is NO chemical bonds are made or broken

1.24.1 continued… Chemical Change Occurs when chemical bonds are formed or broken At least one NEW substance is formed

Chemical or Physical Chemical Physical Chemical Physical 1.24.2 Chemical changes produce new substances (elements or compounds) but physical changes do not. Chemical or Physical Hydrogen reacts with oxygen to produce water. Ice (water in solid state) melts to form liquid water. Sodium reacts with chlorine to produce table salt Creating fog at a rock concert by subliming dry ice Chemical Physical Chemical Physical

1.24.3 List examples of physical changes and chemical changes Change of state Corrosion Cutting things Fruit ripening Combustion Dissolving

Worksheet: Classify as Chemical Change Physical Change Both 1.24.3 continued… Worksheet: Classify as Chemical Change Physical Change Both

1.24.4 List evidence that a chemical change may have occurred Heat is absorbed or released A new color appears A precipitate is formed A gas is produced Process is difficult to reverse (Note: Evidence for a chemical change text page 89)

1.24.5 Recognize that during a chemical change, elements are conserved but compounds are not. (NOTE: Equations are not balanced) NaCl--- Na + Cl2 CH4 + O2--- CO2 + H2O NaCl + BeF2-- NaF + BeCl2

1.25 Use tools and apparatus safely Core Lab 3.3C: Observing Changes in Matter

1.26 Identify new questions about physical and chemical changes that arise from investigations Core Lab 3.3C: Observing Changes in Matter

1.27 Organize data using a format that is appropriate to the task or experiment Core Lab 3.3C: Observing Changes in Matter

1.28 Determine if changes in a object is physical or chemical based on experimental data Core Lab 3.3C: Observing Changes in Matter