![]() The number of protons in the nucleus determines the type of element. A molecule can be made from two or more of the same kind of atom or from two or more different kinds of atoms.Ģ3 Recognize that there are more than 100 elements and some have similar properties as shown on the Periodic Table of Elements Each element is made of a different atom. Atoms are tiny particles composed of protons, electrons, and neutrons.Ģ2 Distinguish between atoms and molecules.Ītoms and molecules are always in motion Atoms Molecules Smallest basic unit of matter. Molecules are the “building blocks” of matter. Two or more atoms can join together to form a molecule. Distinguish between atoms and molecules.Ģ1 Atoms and Molecules Matter is made up of tiny moving particlesĬalled atoms and molecules. Standard S8P1 Students will examine the scientific view of the nature of matter a. When matter undergoes change, it always involves energy going into or out of the system Whether the change is physical or chemical, the total amount of matter always stays the same, even though the materials my appear much different after the change as compared to beforeġ7 Physical and Chemical Changes Study Jams Videoġ9 Summarizing Strategy Complete a Venn Diagram comparing a Physical Change to a Chemical ChangeĢ0 a. When instructed, share your chemical change with a partner and explain why it is an example of a physical change. On your notes sheet, identify and describe a chemical change that you have made or observed in the past few days. What clues could you use to determine there was a chemical change? You smell the cake baking You see the batter rise You see the cake brown You can see air pockets made by gas bubbles that formed in the batter when it is finished baking A new substance is formed that cannot be reversedīurning Rusting Cooking/Frying Fireworks Using a battery Digestion Fermenting Respiration Decomposition Photosynthesis The result is a cake that has properties that differ from the properties of the ingredients.ġ3 Chemical Change: Baking a Cake Example However, when you bake the batter, you end up with something completely different. To bake a cake, you combine eggs, flour, sugar, and other ingredients. ![]() They are called “products.” The product cannot go back to its original reactants.ġ2 Chemical Change: Baking a Cake Example After a chemical change the new substances are formed. Substances before a chemical change are “reactants”. More than one clue should be used to determine chemical changeįizzing and Foaming Emission of Light Formation of a Precipitate Development of Gas Some Clues that a Chemical Change occurred: Fizzing Foaming Change in color Change in odor Production of heat Sound given off Emission of light Development of gas Formation of a precipitate The signs are not definite. ![]() ![]() Chromium has the Chemical Property of Non-reactivity with Oxygen. Why then does the bumper on the car still look shiny and new? The bumper is coated with chromium. The Chemical Change occurs only when the car is left out and is exposed to oxygen and it rusts. The iron used to make the old car above has the Chemical Property of Reactivity with Oxygen. What is the difference between a chemical property and a chemical change? A chemical property of a substance determines whether a chemical change can occur A chemical change is the actual process of changing Let’s look at an old car as an exampleĨ What is the difference between a Chemical Property and a Chemical Change? When instructed, share your physical change with a partner and explain why it is an example of a physical change.Ī chemical change happens when one or more substances are changed into new substances that have new and different properties Most chemical changes are difficult to reverse Some chemical changes can be reversed by more chemical changesħ A chemical change is the actual process of changing On your notes sheet, identify and describe a physical change that you have made or observed in the past few days. Some Examples of Physical Change: Melting Boiling Breaking Dissolving Bending Condensing Cutting Evaporating Freezing Changing State Crushing The identity of the substance stays the same No new substance is formed Physical changes are more easily reversed Describe your observations and the differences on your Notes sheet.Ī physical change is a change that affects one or more physical properties of a substance. Distinguish between changes in matter as physical (i.e., physical change) or chemical (development of a gas, formation of a precipitate, and change in color)Ģ Activating Strategy: Watch the two video clips showing two ways to change a sheet of paper. Presentation on theme: "How does a physical change differ from a chemical change in matter?"- Presentation transcript:ġ How does a physical change differ from a chemical change in matter?
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