PREVNEXTSUBMITMenuResourcesGlossaryNotesClear and return to MenuSearch ResultsFilterSlide TextNotesSearch in:Check to includeSearch...TermsDefinitiondefinitionresourcessearchpauseplayreplaysubmitnextpreviousvolumewelcome to the rosedale academy chemistry lab click here to enter the lab welcome to the rosedale academy hess's law calorimetry lab. in this lab you will measure the heat of a reaction of several reactions to calculate the change in enthalpy for the burning of magnesium, which occurs too rapidly to measure on its own. next you must always consider laboratory safety practices when performing these experiments, even though they take place in our virtual lab, it is always important to consider your own safety and the safety of others when handling any chemicals or lab equipment . next lets begin by selecting the equipment you will need to perform the experiment for today. look at your equipment and materials lists and make sure to select the appropriate lab tools and necessary safety equipment for each experiment. the chemicals you need will be waiting for you at each station. next welcome to the rosedale academy chemistry lab 201 chemistry lab storeroom click on the door to enter the rosedale academy chemistry lab storeroom to pick up your equipment for this lab. zzz zzz gloves pipettes reagent bottles test tubes bunsen burner round bottom flask erlenmeyer flask beaker hot plate microscope goggles lab coat thermometer test tube rack eyedropper scale styrofoam cup styrofoam lid thermometer stirring rod gloves continue continue try again check your equipment list on the lab handout and load the proper equipment onto the cart to move on to the next slide. once you have loaded everything press "submit". don't forget the necessary safety equipment! ok #1 begin the lab by building the coffee cup calorimeter. step 1: place styrofoam cup #1 inside the other styrofoam cup. step 2: place the styrofoam lid, with the thermometer and the stirrer on top of the nested cups. ok next slide 0.00 g measure the mass of the empty calorimeter by placing it on the scale. make sure to wait until the values on the scale stop changing before recording your observations. ok 1.52 g 4.71 g 7.99 g 13.67 g 18.91 g 22.12 g 26.22 g 27.70 g next slide make sure to record your observations before moving on to the next slide drag the beaker of hydrochloric acid over to the coffee cup and pour the correct volume of water into it. ok how many ml of hydrochloric acid would you like to add to the calorimeter? enter the number of ml and click submit. submit that value is incorrect, please try again. 100 next slide 1.0 m hcl 0.00 g note that the image of the calorimeter now shows a cross-section which is defined by the dashed line. with this view of the cross-section, we can see through the styrofoam cups and see the inside of the calorimeter ok reweigh the calorimeter now that it is filled with hydrochloric acid and record the mass in your observations ok 127.70 g next slide 99.76 g 82.13 g 60.09 g 45.88 g 30.01 g 14.34 g 6.67 g 0.00 g measure out the appropriate amount of magnesium oxide by dragging the bottle over the scale. ok 0.00 g 4.5 how many grams of magnesium oxide would you like to weigh? type in the correct value in the box below and click the submit button. submit that value is incorrect. check the lab procedure for the correct value and try again next slide make sure to record the mass of magnesium oxide that you have collected. 0.13 g 0.27 g 0.39 g 0.75 g 0.90 g 0.96 g 23.5 ºc next slide record the initial temperature of the water by clicking anywhere on the thermometer. make sure to record this value in your observations ok add the magnesium oxide to the hydrochloric acid in the calorimeter and then put the lid with the thermometer and stirrer on top of the calorimeter, then click next to begin observing the reaction. ok next slide start 23.5 ºc 24.1 ºc 27.2 ºc 25.9 ºc 30.5 ºc 31.6 ºc now that the temperature has stopped changing, make sure to record the final temperature reading in your observations. next slide ok, so we have our calorimeter set up, with the magnesium oxide added and our initial observations recorded. click on the start button to begin stirring the solution and watch the thermometer and temperature readings to observe the transfer of heat that occurs as the solute dissolves. when the temperature stops changing make sure to record the final temperature of the water. ok you have now completed part 1 of this lab, in part 2 we will follow the same basic procedure for the reaction between hydrochloric acid and magnesium. next slide 0.00 g measure the mass of the empty calorimeter by placing it on the scale. make sure to wait until the values on the scale stop changing before recording your observations. ok 1.52 g 4.71 g 7.99 g 13.67 g 18.91 g 22.12 g 26.22 g 27.70 g next slide make sure to record your observations before moving on to the next slide drag the beaker of hydrochloric acid over to the coffee cup and pour the correct volume of water into it. ok how many ml of hydrochloric acid would you like to add to the calorimeter? enter the number of ml and click submit. submit that value is incorrect, please try again. 100 next slide 1.0 m hcl 0.00 g note that the image of the calorimeter now shows a cross-section which is defined by the dashed line. with this view of the cross-section, we can see through the styrofoam cups and see the inside of the calorimeter ok reweigh the calorimeter now that it is filled with hydrochloric acid and record the mass in your observations ok 127.70 g next slide 99.76 g 82.13 g 60.09 g 45.88 g 30.01 g 14.34 g 6.67 g 0.00 g measure out the appropriate amount of magnesium oxide by dragging the bottle over the scale. ok 0.00 g 0.5 how many grams of magnesium ribbon would you like to weigh? type in the correct value in the box below and click the submit button. submit that value is incorrect. check the lab procedure for the correct value and try again magnesium ribbon next slide make sure to record the mass of magnesium oxide that you have collected. 0.13 g 0.22 g 0.35 g 0.48 g 0.55 g magnesium ribbon magnesium ribbon 23.5 ºc next slide record the initial temperature of the water by clicking anywhere on the thermometer. make sure to record this value in your observations ok add the magnesium oxide to the hydrochloric acid in the calorimeter and then put the lid with the thermometer and stirrer on top of the calorimeter, then click next to begin observing the reaction. ok now place the calorimeter lid on top of the calorimeter to move on to the next step next slide start 23.5 ºc 27.1 ºc 36.7 ºc 31.9 ºc 43.2 ºc 47.7 ºc now that the temperature has stopped changing, make sure to record the final temperature reading in your observations. next slide ok, so we have our calorimeter set up, with the magnesium oxide added and our initial observations recorded. click on the start button to begin stirring the solution and watch the thermometer and temperature readings to observe the transfer of heat that occurs as the solute dissolves. when the temperature stops changing make sure to record the final temperature of the water. ok now remember, the last step of any lab exercise is to clean up your station properly. this means disposing of any dangerous chemicals in the appropriate place and washing all glassware and equipment thoroughly. click the button below, to take care of the clean-up, thankfully its a lot easier to do in the rosedale academy lab. clean up great job! you have now completed all of the required steps for this lab. make sure that you have recorded all of your observations, if you missed some, you can go back and perform the experiments again, otherwise you can now go ahead and answer the questions on your lab handout. click finish to exit the rosedale academy chemistry lab finish