Physical Changes EQ: How would you prove whether change in matter was a physical change or a chemical change? October 4, 2012

Physical Changes Changes to the physical properties of matter in which the identity of the matter stays the same Changes to the physical properties of matter in which the identity of the matter stays the same

Shape and Size Shape and Size –Cutting a cake into pieces –Pouring a glass of milk –Folding clothes –Folding papers to fit neatly into your ISN –Folding papers to fit neatly into your ISN

State State –Melting, freezing, boiling –(We’ll look more at this in chapter 7.) Dissolving Dissolving –To separate the mixture of sand and salt from yesterday’s mixtures, you would first need to add water to dissolve the salt.

Conservation of Mass Lab—Adv. Given the following supplies, design an investigation for testing the Law of Conservation of Mass: baking soda, vinegar, plastic bag, spoon, scale. Given the following supplies, design an investigation for testing the Law of Conservation of Mass: baking soda, vinegar, plastic bag, spoon, scale. On p. 50 in your INB, (1) describe your investigation, (2) show your data clearly (mini table), (3) graph your data, and (4) write a short conclusion. On p. 50 in your INB, (1) describe your investigation, (2) show your data clearly (mini table), (3) graph your data, and (4) write a short conclusion.

Is the mass of matter conserved during a physical change? On p. 50 of your INB, On p. 50 of your INB, –Find the mass of a small amount of sugar. Record this amount. –Find the mass of a small container of water. Record this amount. –Add the sugar to the water and swirl/stir until the sugar dissolves. –Find the mass of the solution. Record this amount. –Create a graph of your data. –Write your conclusions. Be sure to use the term Law of Conservation of Mass and use your data to support your conclusions.

Can the weight of an object change? Use a balance to mass 5 washers. Record (bottom of page 50 in your ISN). Use a balance to mass 5 washers. Record (bottom of page 50 in your ISN). Hang from spring scale and record weight (in Newtons). Hang from spring scale and record weight (in Newtons). Lower into 500-mL beaker containing 300 mL of water. Record (in Newtons). Lower into 500-mL beaker containing 300 mL of water. Record (in Newtons). Write your conclusions. Did the weight change? Why or why not? Write your conclusions. Did the weight change? Why or why not?