Daily TAKS Connection: Physical and Chemical Changes Objective 4 IPC(8) The student knows that changes in matter affect everyday life. The student is expected to: (A) Distinguish between physical and chemical changes in matter such as oxidation, digestion, changes in states, and stages in the rock cycle.

Construct a two tab foldable Materials Sheet of paper scissors Instructions: Hamburger fold the handout along center dash line Cut along solid line from edge to center fold Color “Physical Changes” flap Color “Chemical Changes” flap a second color

Features of a Physical Change Record the following notes under the “Physical Changes” flap Identity of material DOES NOT change Ex: when you crush ice, the resulting material is still ice Includes: changes in state (evaporation, condensation, melting, boiling, freezing) More words to look for:

“Words to Look For” (Write these under Physical Changes Flap) subduction of plates heat loss from lava compression of sediments evaporation of water from the surfaces of leaves condensation of water on dust particles in the air forming clouds and fog ice cracking spoonful of sugar is dissolved in a cup of coffee. lead melting copper wire is cut into smaller pieces. water molecule gains enough energy to enter the vapor phase antifreeze is added to a car radiator to lower the freezing point moon rocks being converted to lunar soil by sedimentation

Question (hint: look for the words indicating type of change) In the rock cycle, which of these is a physical change involved with the formation of igneous rocks? a. Compression of sediments b. Subduction of plates c. Heat loss from lava d. All of the above

Question (hint: look for the words indicating type of change) Sheets of ice containing mostly pure water can be formed by decreasing the temperature of saltwater. Which of these best describes this change? a. Chemical change b. Nuclear change c. Physical change d. Atomic change

Question (hint: look for the words indicating type of change) Compounds with the same chemical composition may have different densities because they — a. have differences in reactivity b. vary in solubility c. are able to bond with oxygen d. exist in different phases

Clues of a Chemical Change Identity of material DOES change Ex: oxygen combines with iron to form iron oxide (rust) Includes all chemical changes Words to look for: Souring, rotting, decomposing, burning, changing, forming, producing, acid weathering, rusting, oxidizing More words to look for:

“Words to Look For” (Write these under Chemical Changes Flap) A silver bracelet tarnishes. A bicycle is left out in the rain and begins to rust. Leaves on an oak tree turn red as winter approaches. Starches and sugars being broken down during energy production Water and carbon dioxide being converted to glucose Iron in rock combining with oxygen to form hematite Acid rain damaging marble

Question (hint: look for the words indicating type of change) Which of the following is an example of a chemical change? a. Ice cracking b. Sugar dissolving c. Milk souring d. Lead melting

Question (hint: look for the words indicating type of change) Which of these describes a pollution-producing process that involves a chemical change? a.Coal with a high sulfur content is burned, producing gases that cause acid rain. b.Chlorofluorocarbons are released, changing ozone in the upper atmosphere into oxygen. c. Nitrogen oxide emissions combine with water vapor, producing nitric acid. d. All of the above

Question (hint: look for the words indicating type of change) Which of these changes in rocks is NOT a chemical change? a.Acid rain damaging marble b.Carbonic acid weathering limestone c. Iron in rock combining with oxygen to form hematite d. An ice wedge shattering a slab of shale

Apply Your Knowledge Determine if the scenarios written on each card belong under the Chemical Change or Physical Change Heading. Begin Sorting and Classifying!!