Download
1 / 10
100 likes | 176 Vues
Explore the world of chemical and physical reactions, from altering materials' forms to creating new substances. Discover how factors like temperature, agitation, concentration, and surface area impact reaction rates. Engage in hands-on experiments to observe these reactions firsthand. Unleash your inner scientist and dive into the exciting realm of chemistry!
E N D
Chemical and Physical Reactions • Physical Reaction– a reaction that alters the form or appearance of a material but does not make the material into another substance: change shape, phase change • Chemical Reaction– a reaction that produces new substances that are made of the same elements, but have changed into different combinations of elements
Observing Chemical Reactions • Chemical changes occur when bonds break and new bonds form – changes in properties and changes in energy that can be observed • Some factors that show a chemical reaction is taking place: • Change in energy • Color change • Formation of a gas • Change in odor • Formation of a precipitate (solid forms from a solution)
Rates of Chemical Reactions • Reaction Rate = time it takes for a chemical reaction to take place. • Chemical reactions do not all occur at the same rate. Examples: explosions, rust
Factors that affect Reaction Rates Temperature – adding heat increases rate, removing heat decreases 2. Agitation – adding movement energy can increase the rate of the reaction.
Factors • Concentration – increasing the amount of a material supplies more particles to react. 4. Surface Area – increase the surface area to exposes more of the particles of the substance, this increases a chemical reaction, decrease the surface area to decrease a chemical reaction
Factors 5. Catalysts – a material that increases the rate of a reaction by lowering the energy needed for the reaction. (Enzymes) 6. Inhibitors – a material used to decrease the rate of a reaction (Preservatives)
Brainstorm! • Using what you have learned about reaction rates, in your groups try to devise 3 different ways to conduct the experiment that will change the rate of the reaction. • Your only materials are the tablet, the water and the film canister.
Procedure • On your lab sheet record the three types of trials you will conduct • Conduct each experiment timing the reaction from the time you combine the materials to the time the top pops off. • Record your results in the data table and complete the conclusion questions with your team.
