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1.
Chemical Reactions CHAPTER
7 Physical Science Textbook: Physical Science Concepts in Action Prentice Hall © 2009 © J. O’Reilly 2012
2.
Describing Reactions ©
J. O’Reilly Chapter 7.1
3.
7.1 Describing Reactions
Objectives By the end of this section of the book, you should be able to… You might want to leave space in your notes between objectives so you can answer them later! © J. O’Reilly • Understand the law of conservation of mass • Balancing chemical reactions • Compare atomic level structure to visible structure for ionic compounds
4.
Key Terms
– I know exactly what the word means and I could teach it to someone else. – I know the word and could probably use it correctly. – Huh? 7.1 Describing Reactions © J. O’Reilly _____ product _____ _____ reactant _____ _____ law of conservation of mass_____
5.
Chemical Equations •
Describe change by including what is present before & after that change – Reactants – undergo change • Before change – Products – formed from the change • After change • Reactants change into products REACTANTS PRODUCTS © J. O’Reilly
6.
Chemical Equations •
Reactants & products are expressed as formulas – C + O2 CO2 – How many atoms of each element are on each side of the equation – 1 C and 2 O on the reactant side – 1 C and 2 O on the product side – It’s a balanced equation! Just like in Math. © J. O’Reilly
7.
Conservation of Mass
& Balancing Equations • Mass is never created nor destroyed in a chemical reaction (rxn) • Aka law of conservation of matter H2 + O2 H20 Do the number of atoms of each elements on each side add up? © J. O’Reilly
8.
Balancing Equations •
Mass is conserved during a rxn chemical equation must be balanced – Balance by changing coefficients • Numbers that appear before the formula • No coefficient listed ~ assumed 1 H2 + O2 H20 H2 + O2 2H2O 2H2 + O2 2H2O © J. O’Reilly
9.
Try another one
• Ca + NaCl ----> Na + CaCl2 • 1- Count # of atoms for each element on both sides • 2- Find one element that is imbalanced • 3- Add a coefficient to balance both sides • 4- Recount and add more coefficients to fix anything your coefficent changed – Try and balance 1 element at a time, and don’t worry if you have to bounce back and forth a few times as you add coefficients, that is normal. – You CANNOT change subscripts (little numbers) as that would change the chemical formula, only add coefficients before the molecule © J. O’Reilly
10.
Types of Reactions
© J. O’Reilly Chapter 7.2
11.
Energy Changes in
Reactions © J. O’Reilly Chapter 7.3
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