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U2L2 - Physical and Chemical Changes

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Science Fusion PowerNotes - Grade 8 …

Science Fusion PowerNotes - Grade 8
Unit 2 Lesson 2 - Physical and Chemical Changes

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  • 1. Unit 2 Lesson 2 Physical and Chemical Changes Copyright © Houghton Mifflin Harcourt Publishing Company
  • 2. Unit 2 Lesson 2 Physical and Chemical Changes Indiana Standards Copyright © Houghton Mifflin Harcourt Publishing Company • 8.1.7 Explain that chemical changes occur when substances react and form one or more different products, whose physical and chemical properties are different from those of the reactants. • 8.1.8 Demonstrate that in a chemical change, the total numbers of each kind of atom in the product are the same as in the reactants and that the total mass of the reacting system is conserved.
  • 3. Change of Appearance Copyright © Houghton Mifflin Harcourt Publishing Company What are physical changes of matter? • A physical change is a change that affects one or more physical properties of a substance. • The appearance, shape, or size of a substance may be altered during a physical change. • Physical changes, such as changes in state, do not change the chemical identity of a substance. Unit 2 Lesson 2 Physical and Chemical Changes
  • 4. Change from the inside Copyright © Houghton Mifflin Harcourt Publishing Company What are chemical changes to matter? • A chemical change is the process in which one or more substances change into entirely new substances. • Chemical changes are not the same as chemical properties. • Burning is a chemical change; flammability is a chemical property. Unit 2 Lesson 2 Physical and Chemical Changes
  • 5. What are chemical changes to matter? • When particles and chemical bonds that make up a substance are rearranged, a chemical change has taken place. • Chemical changes are often influenced by temperature. • Higher temperatures often mean faster chemical reactions. Copyright © Houghton Mifflin Harcourt Publishing Company Unit 2 Lesson 2 Physical and Chemical Changes
  • 6. Look for the Signs Copyright © Houghton Mifflin Harcourt Publishing Company How can you tell a chemical change has happened? • There are several signs that a chemical reaction has occurred. • Observing two or more of these signs during a change means you are likely observing a chemical change. Unit 2 Lesson 2 Physical and Chemical Changes
  • 7. How can you tell a chemical change has happened? • Odors can be produced during a chemical change. • Fizzing and foaming may mean gases are being produced. • The production of gas is often evidence of a chemical change. • Boiling also can produce gas bubbles, but boiling is a physical change. Copyright © Houghton Mifflin Harcourt Publishing Company Unit 2 Lesson 2 Physical and Chemical Changes
  • 8. How can you tell a chemical change has happened? • A precipitate is a solid that falls out of solution. • The formation of a precipitate can indicate a chemical change. • Energy that changes from one form to another can be evidence of a chemical change. • Changes in temperature and color can be signs of a chemical change. Copyright © Houghton Mifflin Harcourt Publishing Company Unit 2 Lesson 2 Physical and Chemical Changes
  • 9. Conservation Is the Law Copyright © Houghton Mifflin Harcourt Publishing Company What is the law of conservation of mass? • French chemist Antoine Lavoisier studied chemical changes in which substances appeared to gain or lose mass. • Lavoisier completed experiments in sealed bulbs to show conservation of mass during a reaction. Unit 2 Lesson 2 Physical and Chemical Changes
  • 10. What is the law of conservation of mass? • The law of conservation of mass states that in ordinary chemical and physical changes, mass is not created or destroyed. It is only transformed into different substances. Copyright © Houghton Mifflin Harcourt Publishing Company Unit 2 Lesson 2 Physical and Chemical Changes
  • 11. What is the law of conservation of mass? • Physical changes are reversible and follow the law of conservation of mass. • Mass is conserved during chemical changes. The mass of the starting materials is the same as the mass of the end products. Copyright © Houghton Mifflin Harcourt Publishing Company Unit 2 Lesson 2 Physical and Chemical Changes