1. Think about our powder lab from last week.
Substance
Mixed (water)
Mixed (vinegar)
Mixed (iodine)
Type of Change
Baking soda
Physical
Chemical
Cornstarch
Baking Powder
Salt
Think about our powder lab from last week.
What are two physical properties that baking soda and baking powder share?
What is one chemical property that baking soda and baking powder share?
8/29/16

2. Which picture illustrates a physical change?
8/30/16
Which piece of evidence listed is not used in the pictures above to show signs of a chemical change?
a. A precipitate b. Color Change
c. Release of light d. Formation of a gas

3. Many food products have a date on the container so that the food should be eaten before it spoils. A student pours milk from a carton with a "use by" date of two weeks earlier. The milk is lumpy and smells bad Identify the type of change that occurred in milk over time. Explain your reason.
2. Identify the type of change that occurred when the student poured the milk into a glass. Explain your reason. 3. Describe a type of change that occurs as the person adds chocolate syrup to a glass of fresh milk. Explain your reason.
9/1/16

4. A Heat is added to the sugar crystals.
A student observes some sugar as it is heated and burns. The student concludes that a chemical reaction has occurred. Which of the following observations about the burning sugar provides evidence of a chemical reaction?
A Heat is added to the sugar crystals.
B The sugar melts and becomes a liquid.
C The temperature of the sugar increases.
D Gas is produced as the sugar turns black.
Explain your answer.
8/31/16