1. Chemical Reactions Chapter 2

2. Chemical Reactions Law of Conservation of Matter: Matter is neither created nor destroyed, it just changes form Law of Conservation of Matter: Matter is neither created nor destroyed, it just changes form During a chemical reaction you can change the arrangement of the atoms… and therefore the behavior During a chemical reaction you can change the arrangement of the atoms… and therefore the behavior

3. Reactants : what you start with Products: what is made Elements Subscript Energy can be absorbed or released during a chemical reaction Steel and vinegar Vinegar and baking soda If you need energy just to start the reaction, its called the “activation energy”.

4. Activation Energy Chemical reactions that release energy often occur spontaneously. Chemical reactions that release energy often occur spontaneously. Chemical reactions that absorb energy will occur only with a source of energy. Chemical reactions that absorb energy will occur only with a source of energy.

5. An important chemical reaction that occurs in your body involves carbon dioxide. An important chemical reaction that occurs in your body involves carbon dioxide. Your cells produce carbon dioxide as a normal part of their activity. Your cells produce carbon dioxide as a normal part of their activity. Carbon dioxide is not very soluble in water. As it enters the blood, carbon dioxide reacts/bonds with water to produce a highly soluble compound called carbonic acid, H2CO3. Carbon dioxide is not very soluble in water. As it enters the blood, carbon dioxide reacts/bonds with water to produce a highly soluble compound called carbonic acid, H2CO3.

6. The reaction shown above enables the bloodstream to carry carbon dioxide to the lungs. The reaction shown above enables the bloodstream to carry carbon dioxide to the lungs.

7. In the lungs, the reaction is reversed. In the lungs, the reaction is reversed. This reverse reaction produces carbon dioxide gas, which is released as you exhale. This reverse reaction produces carbon dioxide gas, which is released as you exhale.

8. Release of energy during reaction Heat Heat Sound Sound Light Light Kinetic/ Potential Kinetic/ Potential Energy is not matter… Energy is not matter…

9. E=MC2 There is a scientific law called the Law of Conservation of Mass, discovered by Antoine Lavoisier in 1785. In its most compact form, it states: matter is neither created nor destroyed. There is a scientific law called the Law of Conservation of Mass, discovered by Antoine Lavoisier in 1785. In its most compact form, it states: matter is neither created nor destroyed.Antoine Lavoisier in 1785.Antoine Lavoisier in 1785. In 1842, Julius Robert Mayer discovered the Law of Conservation of Energy. In its most compact form, it it now called the First Law of Thermodynamics: energy is neither created nor destroyed. In 1842, Julius Robert Mayer discovered the Law of Conservation of Energy. In its most compact form, it it now called the First Law of Thermodynamics: energy is neither created nor destroyed. In 1907 (I think), Albert Einstein announced his discovery of the equation E = mc2 and, as a consequence, the two laws above were merged into the Law of Conservation of Mass-Energy: In 1907 (I think), Albert Einstein announced his discovery of the equation E = mc2 and, as a consequence, the two laws above were merged into the Law of Conservation of Mass-Energy: the total amount of mass and energy in the universe is constant.

10. Chem reactions Co2+ H20 = is reversible? Co2+ H20 = is reversible? Matter is neither created nor destroyed Matter is neither created nor destroyed Chg arrangement and behavior Chg arrangement and behavior `Element reactants subscript product release of energy? `Element reactants subscript product release of energy? Activation energy- need to start it Activation energy- need to start it