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Chemical Changes :

. PRESS THE RIGHT-ARROW BUTTON ON YOUR KEYBOARD TO ADVANCE THROUGH THE PRESENTATION. SPI 0807.9.2 Chemical Change Outcomes. Notes. Chemical Changes : occur when a substance, due to a chemical reaction , is changed into a new substance .

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Chemical Changes :

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  1. PRESS THE RIGHT-ARROW BUTTON ON YOUR KEYBOARD TO ADVANCE THROUGH THE PRESENTATION SPI 0807.9.2 Chemical Change Outcomes Notes • Chemical Changes: • occur when a substance, due to a chemical reaction, is changed into a new substance. • occur when you combine 2 or more or more reactive substances (elements/atoms) • The atomic bonds break apart (at the electron level) • new atomic bonds are formed • Electrons are transferred or shared (ionic & covalent bonding) • ….so in other words • chemical bonding and chemical reactions are connected • Chemical bonding is what happens in a chemical reaction

  2. Chemical Reaction due to Ionic Bonding-bond formed by electron transfer

  3. Chemical Reaction due to Covalent Bonding-bond formed by sharing of electrons Notes

  4. SPI 0807.9.2 Chemical Change Outcomes Notes • Compounds • The end product of all chemical reactions is a compound • Memory Trick: C = C (chemical reactions = compounds) Example: When two hydrogen atoms react with one oxygen atom you produce (create) the compound called water (H2O). H Oxygen Oxygen H H H

  5. SPI 0807.9.2 Chemical Change Outcomes Notes 5 Key Points About All Chemical Reactions: 1) A new substance is created 2) The properties of the new substance are different from the substances that you started with 3) No atoms are lost or gained during chem reactions 4) Atomic bonds are broken (at the electron level) and new bonds are formed 5) All chemical reactions produce compounds

  6. SPI 0807.9.2 Chemical Change Outcomes Notes • Chemical Change Indicators • Below are some indicators of chemical changes… • There may be a change in odor(how it smells) • Heat may be given off (it may get hot) • It may explode(like fire crackers or dynamite) • It may fizz or foam(like Alka-Seltzer or vinegar & baking soda) • Sound may be heard (it may boom, pop, sizzle, etc.) • Light may be given off (it may flash or sparkle) • It may change color • Also, it may form a solid substance called a precipitate • (Click the link below to see a reaction forming a precipitate) • Link:Precipitate Being Formed in Chemical Reaction

  7. SPI 0807.9.2 Chemical Change Outcomes Notes TALK

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