Work hard. Be nice. Name: Period: Date: UNIT 1: Introduction to Matter Lesson 10: Baby, you ve changed

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Name: Period: Date: UNIT 1: Introduction to Matter Lesson 10: Baby, you ve changed Do Now: By the end of today, you will have an answer to: How can matter change? 1. Which is a homogeneous mixture?

1 Name: Period: Date: UNIT 1: Introduction to Matter Lesson 10: Baby, you ve changed Do Now: By the end of today, you will have an answer to: How can matter change? 1. Which is a homogeneous mixture? (1) I 2(s) (2) I 2(l) (3) HCl(g) (4) HCl(aq) 2. Which list of formulas represents compounds, only. (1) CO 2, H 2O, NH 3 (3) H 2, Ne, NaCl (2) H 2, N 2, O 2 (4) MgO, NaCl, O 2 3. Given the diagrams X, Y, and Z below: Which diagram or diagrams represent a mixture of elements A and B? (1) X, only (2) Z, only (3) X and Y (4) X and Z 4. Describe why filtration is not the best method to separate salt from water. (1). CATALYST ACTIVITY! The process to make caramel: ( 1. Heat an even layer of sugar in a heavy duty pan over low heat. 2. Stir only until the sugar dissolves in the water. 3. Watch the mixture carefully. What are some physical properties of sugar? Write down observations you notice during heating. What are some physical properties of the final product made?

2 THINK, WRITE, and DISCUSS: 1. What did you notice happened to the sugar first before it turned brown? 2. Did the physical properties of sugar change? How do you know? 3. Do you think it is possible to turn the caramel back into sugar? Why or why not? 4. What you saw was an example of both a physical change and a chemical change. Which part demonstrated a physical change in the sugar? Which part demonstrated a chemical change? What evidence did you use to reach your conclusion? Physical versus Chemical Changes: Definition PHYSICAL CHANGE A change which alters a substance without changing its composition (what it is made of). CHEMICAL CHANGE A change that causes the creation of new substances. Chemical Notation Examples Key Words Before After Before After Particle Diagram of example!!

3 Name: Pd.: Date: WORK 1.10: Physical and Chemical Changes 10 Points Use the definitions above to categorize the properties shown on the PowerPoint as physical or chemical change on the table below. Physical Change Chemical Change SUMMARIZE: What is the difference between a chemical and physical property versus a chemical and physical change? 1. A student has two unknown substances, compound A and compound B. Which statement describes a chemical property that can be used to distinguish between compound A and compound B. (1) A is a blue solid, and B is a white solid. (2) A has a high melting point, and B has low melting point. (3) A dissolves in water, and B does not dissolve in water. (4) A does not burn in air, and B does burn in air. 2. In an investigation, a dripless wax candle is massed and then lighted. As the candle burns a small amount of liquid wax forms near the flame. After 10 minutes, the candle s flame is extinguished and the candle is allowed to cool. The cooled candle is massed. a) Identify one physical change that takes place in this investigation. b) State one observation that indicates a chemical change has occurred in this investigation.

4 Directions: Classify each as a chemical or physical change CHANGE A piece of wood burns to form ash. Water evaporates into steam. A piece of cork is cut in half. A bicycle chain rusts. Food is digested in the stomach. Water is absorbed by a paper towel. Hydrochloric Acid reacts with zinc. A piece of apple rots on the ground. A tire is inflated with air. A plant turns sunlight, CO 2, and water into sugar and oxygen. Sugar dissolves in water. H 2O(g) " H 2O (l) Milk sours. A popsicle melts. C(s) + O 2(g) " CO 2 (g) PHYSICAL CHANGE (PC) or CHEMICAL CHANGE (CC)? 3. Which equation represents a physical change? (1) H 2O (s) " H 2O (l) (2) 2 H 2(g) + O 2 (g) " 2 H 2O (g) (3) H 2 (g) + I 2 (g) kj " 2 HI(g) (4) N 2(g) + 2O 2 (g) kj " 2 NO 2 (g) 4. Given the particle diagram representing four molecules of a substance: Which particle diagram best represents this same substance after a physical change has taken place? 5. Powdered iron is magnetic, but powdered sulfur is not. What occurs when they form a mixture in a beaker at room temperature? (1) The iron retains its magnetic properties. (2) The iron loses its metallic properties. (3) The sulfur gains magnetic properties. (4) The sulfur gains metallic properties.

5 Name: Pd: Date: Exit Ticket Quiz 1.10: Chemical and Physical Properties 3 points 1. Which process is a chemical change? (1) Melting of ice (2) Boiling of water (3) Subliming of ice (4) Decomposing of water 2. Which process results in a chemical change? (1) Tearing tin foil (2) Melting an iron bar (3) Crushing an aluminum can (4) Burning magnesium ribbon 3. Which diagram represents a physical change, only? Name: Pd: Date: Exit Ticket Quiz 1.10: Chemical and Physical Properties 3 points 1. Which process is a chemical change? (1) Melting of ice (2) Boiling of water (3) Subliming of ice (4) Decomposing of water 2. Which process results in a chemical change? (1) Tearing tin foil (2) Melting an iron bar (3) Crushing an aluminum can (4) Burning magnesium ribbon 3. Which diagram represents a physical change, only?

Catalyst. What is happening in these images? Is there a difference?

Catalyst. What is happening in these images? Is there a difference? Catalyst What is happening in these images? Is there a difference? To Do Now 1. How is the physical property of matter defined. 2. List at least 3 physical properties of matter. Unit 0: Foundations of