reaction rates 2023 with 100% correct questions and answers

The study of reaction rates is called ___________. kinetics reaction rate refers to how quickly or slowly the ____ disappear and the _____ appear reactants, products if a reaction is to occur, reacting particles must first _______ and this ________ must be effective collide, collision what are two characteristics of an effective collision sufficient energy (lower activation energy) and correct orientation five major factors that affect reaction rate temp, concentration, particle size, catalyst, and pressure Why would a mixture of gases react faster when the volume they occupy is decreased? pressure increases as well as concentration of particles. higher concentration rate= higher collision frequency Why would iron filings rust faster than an iron nail? small particles have more surface area, so there's a higher transfer area. this would cause more collisions, which means it increases the rate of reactions. what is the effect of a catalyst on the required energy to achieve effective collisions catalysts lower activation energy so that more particles have the energy to react. decreasing temp ______ the rate of the reaction decreases what act as catalysts in our bodies enzymes why do our hands get stiff when cold enzyme reactions causes the muscles to contract. it slows down because you can't contract your muscles as fast. enzymes are in molds and bacteria that spoil food. explain, using your knowledge of factors affecting the rate of reaction, why food doesn't spoil as fast when it is refrigerated as it would at room temp temp= measure of kinetic energy, so the energy lowers when temp decreases. less collisions. reaction rate will be slowed. Due to decomposition reactions with oxygen or carbon dioxide in the air, meat begins to feel slimy and smell spoiled. Explain, why meat spoils less rapidly when left unsliced. larger particles= less total surface area so less collision frequency. slowed down reaction rate. based on your knowledge of factors affecting the rate of the reaction, why is there a danger of explosions in places such as silos and cool mines where there are large quantities of powdered, combustible materials there would be higher concentration and surface area, the temps would also be higher, so it would increase collisions. the reaction rate would increases as well. sketch the effect of adding a catalyst on the graph to the right. describe what occurs when you add a catalyst below adding a catalyst will increase the reaction rate because it lowers activation energy sketch the effect of increasing temp on the graph to the right describe what occurs when you increase the temp below increasing the temp will increase the reaction rate because it increases the energy of the molecules. a student performed a lab at 0 degrees celsius and at 25 degrees celsius and graphed the time it took to complete the reaction. interpret and explain her results when the lab was performed at 0 degrees, the reaction took longer to complete because it had a slower rate. with the higher temp, the molecules had more energy so the reaction had a faster rate. this means that the reaction took less time to complete at 25 degrees. explain the two requirements for a successful collision according to the collision theory. first, when molecules collide, they must have enough energy to overcome the activation energy and cause the reaction to occur. additionally, the molecules must have the correct orientation so the correct atoms can combine with each other. describe one method to speed up a reaction and relate it to collision theory. answers may include: increase temperature- increases the energy of molecules so that there are more collisions and more collisions have the energy required to react add a catalyst- decreases the activation energy so that it is easier for molecules to have enough energy to react when they collide. increase concentration of reactants- increases the number of molecules that are colliding increase the surface area- increases the number of collisions and therefore increases the rate of the reaction describe what we did in the making of lactose free milk lab. include the two ways we sped up the reaction and certain to point out how we used both biotechnology and nanotechnology. during the lab we used lactase enzyme to break the lactose into glucose and galactose. the more that lactase "worked" the more glucose we made. the biotechnology portion was the use of the enzyme as a catalyst, which lowers the activation energy and makes the reaction happen faster. the nanotechnology portion was the beads that we made. these beads maximize the surface area of the reaction and when surface area increases, the number of collisions increases therefore the rate of reaction increases.