Chemical Reactions 3-1


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What happens when you mix two substances together?

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Chemical Reactions 3-1

  1. 1. Focus Question: What happens when you combine different chemicals? Fizz Quiz Investigation3-1
  2. 2. Chemical Introduction <ul><li>What do you know about these substances? </li></ul><ul><ul><li>Citric Acid </li></ul></ul><ul><ul><li>Baking Soda </li></ul></ul><ul><ul><li>Calcium Chloride </li></ul></ul><ul><li>Safety First! </li></ul><ul><ul><li>Don’t taste </li></ul></ul><ul><ul><li>Wear goggle </li></ul></ul>
  3. 3. What do you remember about Solutions? <ul><li>How can you make a solution? </li></ul><ul><li>How do you know if a mixture is a solution? </li></ul><ul><li>What does solubility refer to? </li></ul><ul><li>Do you think these three chemicals will make solutions with water? </li></ul><ul><li>How can you find out? </li></ul>
  4. 4. Make Solutions <ul><li>Groups 1, 3, 5, 7, and 9 will test Baking Soda </li></ul><ul><li>Groups 2, 4, 6, and 8 will test Calcium Chloride </li></ul><ul><li>Testing Procedure: </li></ul><ul><ul><li>Get one spoon of assigned chemical in cup </li></ul></ul><ul><ul><li>Add 50 ml of water to substance and stir </li></ul></ul>
  5. 5. Solution Results <ul><li>Baking soda and water make a solution </li></ul><ul><ul><li>Needed to add 25 ml of water </li></ul></ul><ul><ul><li>Not as soluble as citric acid, kosher salt </li></ul></ul><ul><li>Calcium Chloride and water make a solution </li></ul><ul><ul><li>Property of Calcium Chloride </li></ul></ul><ul><ul><ul><li>as it dissolves, energy is released in the form of heat </li></ul></ul></ul>
  6. 6. Two-Chemical Solutions <ul><li>Know that citric acid, calcium chloride, and baking soda all form solutions when mixed with water. </li></ul><ul><li>Do you think mixtures of these substances will form solutions when they are mixed with water? </li></ul><ul><ul><li>If you mix baking soda and calcium chloride with water, will a solution form? </li></ul></ul>
  7. 7. Fizz-Quiz Place Mat <ul><li>Place Mat will help organize your investigations. </li></ul><ul><li>Label 3 cups: 1, 2, and 3 </li></ul><ul><li>Different pair of substances in each cup </li></ul><ul><ul><li>Cup 1: Calcium Chloride and Baking Soda </li></ul></ul><ul><ul><li>Cup 2: Calcium Chloride and Citric Acid </li></ul></ul><ul><ul><li>Cup 3: Baking Soda and Citric Acid </li></ul></ul><ul><li>Once substances are made, set them on the corresponding circle on Fizz-Quiz place mat </li></ul>
  8. 8. Fizz-Quiz Observation Sheet <ul><li>Record your observation using both drawings and written descriptions of what the group observes. </li></ul><ul><li>Investigate Cup 1 - draw and write what you observe - use multisensory observations </li></ul><ul><li>Investigate Cup 2 - observe as above </li></ul><ul><li>Investigate Cup 3 - observe as above </li></ul>
  9. 9. Observations <ul><li>Did the mixture of substances result in solutions when they were mixed with water? </li></ul><ul><li>Set Cup 1 in evaporating tray for later </li></ul><ul><li>Rinse and replace cups and stir sticks in bins. </li></ul><ul><li>Clean up </li></ul>
  10. 10. Results <ul><li>What do you think caused the fizzing in cups 1 and 3? </li></ul><ul><li>Fizzing in a liquid is caused by gas escaping and coming to the surface. </li></ul><ul><li>When calcium chloride and baking soda are mixed with water, the gas Carbon Dioxide forms. </li></ul><ul><li>When citric acid and baking soda are mixed, Carbon Dioxide forms. </li></ul><ul><li>Carbon Dioxide is the same gas that make the bubbles in soda water. </li></ul>
  11. 11. <ul><li>What do you think the white stuff is in Cup 1? </li></ul><ul><li>The white material is a new substance that formed when calcium chloride and baking soda mixed with water. </li></ul><ul><li>The new substance, Calcium Carbonate (chalk), is not soluble in water. </li></ul><ul><li>Settles to the bottom of the cup. </li></ul><ul><li>When a solid substance forms and settles out of a liquid, it is called a Precipitate . </li></ul>
  12. 12. Changes <ul><li>Production of gas and formation of precipitate are both Changes. </li></ul><ul><li>When two or more substances are mixed together and a change occurs: </li></ul><ul><ul><li>Change is Evidence that a Chemical Reaction has taken place </li></ul></ul><ul><ul><li>Reaction results in new substances with properties that are different from the properties of the original substances </li></ul></ul><ul><ul><li>Starting substances called Reactants . </li></ul></ul><ul><ul><li>New substances that form called Products . </li></ul></ul>
  13. 13. Reactions <ul><li>Did a chemical reaction take place in cup 1? </li></ul><ul><ul><li>How do you know? </li></ul></ul><ul><li>Cup 2? </li></ul><ul><ul><li>How do you know? </li></ul></ul><ul><li>Cup 3? </li></ul><ul><ul><li>How do you know? </li></ul></ul><ul><li>What were the reactants in cup 1? </li></ul><ul><li>What were the products in cup 1? </li></ul>
  14. 14. Carbon Dioxide <ul><li>Carbon dioxide is matter. </li></ul><ul><ul><li>Made of particles </li></ul></ul><ul><ul><li>What do carbon dioxide gas particles look like? </li></ul></ul>
  15. 15. Matter <ul><li>Everything in the world is made of atoms. </li></ul><ul><li>Small particles of matter </li></ul><ul><li>90 different kinds of naturally occurring atoms on Earth </li></ul><ul><li>Circles represent atoms </li></ul><ul><ul><li>C = Carbon </li></ul></ul><ul><ul><li>O = Oxygen </li></ul></ul>
  16. 16. Atoms and Molecules <ul><li>Carbon is a substance </li></ul><ul><ul><li>Made of Carbon atoms only </li></ul></ul><ul><ul><li>Carbon atom is the basic particle of the substance carbon </li></ul></ul><ul><li>Oxygen is a different substance </li></ul><ul><ul><li>Made of oxygen atoms only </li></ul></ul><ul><ul><li>Oxygen atom is the basic particle of the substance oxygen </li></ul></ul>
  17. 17. Molecules <ul><li>Atoms can combine with one another. </li></ul><ul><li>When two or more atoms combine, they form Molecules . </li></ul><ul><li>Basic particle of carbon dioxide is a molecule made of one carbon atom and two oxygen atoms. </li></ul><ul><li>Homework: Read “When Substances Change” (pg 28-31) and answer questions </li></ul><ul><li>Vocabulary next: </li></ul>
  18. 18. Vocabulary <ul><li>Carbon dioxide (CO 2 ) </li></ul><ul><ul><li>one of the gases in air. Carbon dioxide can be a product of a chemical reaction. </li></ul></ul>
  19. 19. <ul><li>Chemical reaction </li></ul><ul><ul><li>takes place when two or more substances are mixed together and a change occurs. </li></ul></ul>
  20. 20. <ul><li>Change </li></ul><ul><li>- the process of becoming something different. </li></ul>
  21. 21. <ul><li>Energy </li></ul><ul><ul><li>can take a number of forms and can change from one form to another. </li></ul></ul><ul><ul><li>Heat is one form of energy and can be released during chemical reactions and when substances dissolve. </li></ul></ul>
  22. 22. <ul><li>Evidence </li></ul><ul><ul><li>used by scientists to support their ideas and conclusions. </li></ul></ul><ul><ul><li>Evidence is based on observation. </li></ul></ul>
  23. 23. <ul><li>Reactants </li></ul><ul><ul><li>the starting substances in a chemical reaction. </li></ul></ul><ul><li>Products </li></ul><ul><ul><li>the new substances that form in a chemical reaction. </li></ul></ul><ul><li>6CO 2 + 6H 2 O  C 6 H 12 O 6 + 6O 2 </li></ul><ul><li>Reactants Products </li></ul>
  24. 24. <ul><li>Precipitate - a solid material that forms as a product of a reaction. </li></ul>
  25. 25. <ul><li>Atoms - the smallest particles of matter. Everything is made of atoms. </li></ul><ul><li>Molecules - atoms combined together. The basic particles of substances. </li></ul>
  26. 26. Content <ul><li>What happens when a solution is made with water and two different solutes? </li></ul><ul><li>Sometimes when two (or more) substances are mixed, a reaction occurs; reactants form new products. </li></ul><ul><li>How do you know when a chemical reaction has occurred? </li></ul><ul><li>Changes, such as heat, gas formation, and precipitate formations, are evidence of a chemical reaction. </li></ul>
  27. 27. Content <ul><li>What are the basic particles of matter? </li></ul><ul><li>Atoms are the smallest particles of matter. Atoms can combine to make molecules, which are the basic particles of most substances. </li></ul><ul><li>Your questions? </li></ul>