Msburnett8thgradescience.weebly.com



Name: ____________________________________________________________ Class Period: ________Factors that Influence Reaction Rates LabIntroduction:Use the words below to fill in the statement.WordsEnergyCollideCatalystConcentrationCollision TheoryParticles of matter can only undergo a chemical reaction if they _______________with enough ___________for the reaction to take place. This idea of particles colliding is known as the ___________________. The four factors that can change how fast or slow a reaction can happen are temperature, __________________, surface area, and the use of a _______________.Describe how the following influence the rate at which a reaction happens using at least one complete sentence. Look over your notes or in the book for help.Temperature – Surface Area – Concentration – Catalyst – Inhibitor – Go to the lab bench and obtain two different glow sticks of the same color, two beakers, and a stop watch. Follow the steps below.Take your two beakers and fill one with hot water and another with cold water. Take your glows sticks and record your pre-observations in Table 1. Describe the temperature of the glow stick.Bend the light stick until you hear it “snap” and the liquid begins to glow. Shake the light stick to mix the liquid inside. Describe the temperature of the glow stick after mixing as part of your post observations.Place one glow stick in the cold ice water and the other in the hot water. Start the stop watch and record your observations of the glow sticks in the water in the post-observation section of Table 1. Pay attention to the brightness and intensity of the color as well as any bubbles that may form. After about 3-4 min of observing, take the glow sticks and place the glow stick in the warm water in the cold water and the glow stick from the cold water and put it in the warm water and record your observations for the next 2 min. Rinse out your beakers and throw your light sticks in the garbage.Table 1Glow SticksPre-ObservationsPost-ObservationsCold Water Glow StickWarm Water Glow Stick Go to the lab and get 1 Alka-Seltzer tablet, use your beakers from the last part, two graduated cylinder, and water. Follow the steps below.Take your Alka-Seltzer tablet and cut it in half. Place each half into one of your beakers. Make sure they are dry.In one of your beakers grind up the tablet into a powder the best you can. Record your observations of the tablet in the pre-observation section in Table 2.Measure 20 mL of water into each of you graduated cylinders. Pour the water from your graduated cylinders into the beakers with the tablets.Record your observations after mixing in the post-observation section in Table 2.Table 2Alka-SeltzerPre-ObservationsPost-ObservationsPowderBlockGo to the lab and obtain two beakers, food coloring and a stop watch. Follow the steps below.Take your two beakers and fill one with hot water and the other with cold water.At the same time, add 3 drops of food coloring to each beaker and start the timer. Record the time when the color is completely dispersed throughout the water.Be sure to write in observations while the experiment is running. Table 3Water Temp.Pre-ObservationsPost-ObservationsCold Water With DyeHot Water With DyeConclusion & Analysis: MUST BE IN COMPLETE SENTENCES!!!How long does it takes for a change to occur in the hot-water light stick and in the ice-water light stick? What happens to the light intensity or brightness of each light stick?If you looked closely at the glow stick in the hot water you could have noticed bubbles forming near the top. What causes bubbles to form? Did bubbles form in the cold glow stick? What kind of change did the bubbles indicate?In the Alka-Seltzer, how did the surface area of the tablet effect how quickly the bubbling stopped?During the food coloring experiment, how did the water temperature effect the dispersion of the food coloring? ................
................

In order to avoid copyright disputes, this page is only a partial summary.

Google Online Preview   Download