Balancing Equations
This resource explores the core concepts of chemical reactions, focusing on balancing equations and the conservation of mass. It defines chemical equations, highlighting the roles of reactants and products. Discover how to balance equations to ensure the same number of each type of atom on both sides, ensuring mass remains constant. The guide also touches on factors affecting reaction rates, such as activation energy, surface area, temperature, concentration, and catalysts. Enhance your understanding of chemistry with practical examples and activities.
Balancing Equations
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Presentation Transcript
Balancing Equations Conservation of mass
- Describing Chemical Reactions What Are Chemical Equations? • chemical formulas and other symbols instead of words to summarize a reaction. • Reactants: substances that begin a reaction • Products: substances formed in a reaction
- Describing Chemical Reactions Conservation of Mass • in a chemical reaction, the total mass of the reactants must equal the total mass of the products
- Describing Chemical Reactions Balancing Chemical Equations • a chemical equation must show the same number of each type of atom on both sides of the equation.
Examples HCl + Zn → ZnCl2 + H2 Are the same numbers of atoms on both sides? Which side has less of an element? 2HCl + Zn → ZnCl2 + H2
- Describing Chemical Reactions Balancing Equations Activity Go to my website: http://admin.bhbl.neric.org/~klong to practice equations.
- Controlling Chemical Reactions Energy and Reactions • All chemical reactions need a certain amount of activation energy to get things started.
- Controlling Chemical Reactions Rates of Chemical Reactions • The cells in your body (as in all living things) contain biological catalysts called enzymes. At the end of a reaction, an enzyme molecule is unchanged.
- Controlling Chemical Reactions What increases reaction rate?(how fast a reaction will happen) Causes Increase in surface area Effect Increase in temperature Increased rate of reaction Increase in concentration of reactants (NOT add more of the chemical!!!!) Use of a catalyst Law of conservation of mass with Brainpop
