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Warm Up January 7, 2013

Warm Up January 7, 2013. Suppose you are making s’mores and each s’more requires 2 graham crackers, one large marshmallow, and 3 squares of chocolate. If you have 4 marshmallows, how many can you make? If you have 18 squares of chocolate, how many can you make?

charlton-alberto
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Warm Up January 7, 2013

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  1. Warm Up January 7, 2013 • Suppose you are making s’moresand each s’more requires 2 graham crackers, one large marshmallow, and 3 squares of chocolate. • If you have 4 marshmallows, how many can you make? • If you have 18 squares of chocolate, how many can you make? • If you have 11 graham crackers, how many can you make?

  2. Agenda • Warm Up • Types of Reactions & Balancing Equations Notes • Chemical Reaction Lab Part 2 • Pass Back Exam 3 • Cool Down • HW: • Exam 3 Corrections (optional) • 6.2 Vocabulary Booklet (words AND sentences) (8 words on p. 224) • Finish Chemical Reactions Lab Part 2

  3. Chemical Equations • Reactants – the substances that exist before a chemical change (or reaction) takes place. • Products – the new substance(s) that are formed during the chemical changes. • CHEMICAL EQUATION indicates the reactants and products of a reaction. REACTANTS  PRODUCTS

  4. Types of Reactions • There are three main categories of chemical reactions.

  5. Synthesis • Synthesis reactions combine 2 or more reactants to produce one product. • Example:

  6. Decomposition • Decomposition reactions break down one reactant into more than one product.

  7. Replacement • Replacement reactions are when one element switches places with or replaces another element in a compound.

  8. What Type of Reaction? Replacement

  9. What Type of Reaction? Synthesis

  10. What Type of Reaction? Decomposition

  11. What Type of Reaction? Replacement

  12. What Type of Reaction? Synthesis

  13. What Type of Reaction? Synthesis

  14. What Type of Reaction? Decomposition

  15. What Type of Reaction? Decomposition

  16. What Type of Reaction? Replacement

  17. Meaning of Chemical Formula Chemical Symbol Meaning Composition H2O One molecule of water: Two H atoms and one O atom 2 H2O Two molecules of water: Four H atoms and two O atoms H2O2 One molecule of hydrogen peroxide: Two H atoms and two O atoms

  18. Law of Conservation of Matter • Matter cannot be created or destroyed in ordinary chemical reactions, but it can change forms.

  19. Cl H H H Cl Cl Cl H reactants products reactants products H H Cl Cl Unbalanced and Balanced Equations H Cl Cl Cl H H H2 + Cl2 2 HCl (balanced) (unbalanced) H2 + Cl2 HCl 2 1 2 2 1 2 2 2

  20. Balancing Chemical Equations • Write the equation. • Count the atoms. • Use coefficients to balance atoms. • Check! Coefficients are the big numbers in front of chemical compounds in an equation.

  21. Cool Down • Balancing Equations Sequencing Map

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