Investigation of how Changing the Volume of Water in a Container Affects Its Rate of Heat Loss
Aim :
To investigate how changing the volume of water in a container affects
its rate of its heat loss. The variable of this investigation is the
volume of water which is put in the container.
What I already know:
I already know that the larger the volume of water there is the less
heat loss occurs. I can tell this from my previous pilot experiment
where I investigated, if the volume of water in a beaker affects its
rate of cooling.
In this experiment my conclusion was the beaker with the larger volume
has no more heat energy to give out compared to the beaker with the
smaller volume.
Prediction:
I predict that the increase of water volume in the beaker will affect
the rate of heat loss; this is because of my results of the pilot
experiment which gave me an understanding of the variable in my
Investigation.
Equipment:
This is a list of all the apparatus I will need to use to investigate
my variable.
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300ml Beaker: to contain the volume of H2O.
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[IMAGE] Kettle : To heat up the H2O.
Thermometer: To measure the temperature of the H2O.
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Stopwatch: To time the temperature of each volume of H2O every 30sec.
[IMAGE] H2O : To investigate the rate of cooling.
Diagram: This diagram shows the format and layout of my experiment:
Plan:
§ Collect Equipment needed for investigation.
§ Boil the water using the kettle.
§ Fill the beaker with the correct volume of water, then immediately
insert the thermometer into the beaker with the boiling water.
Remembering for safety reasons do not sit down while doing the
experiment.
§ Start the stop watch immediately not forgetting to record the
starting temperature. Take a reading from the thermometer every
30seconds, remembering to record results in a table.
Thermodynamics is essentially how heat energy transfers from one substance to another. In “Joe Science vs. the Water Heater,” the temperature of water in a water heater must be found without measuring the water directly from the water heater. This problem was translated to the lab by providing heated water, fish bowl thermometers, styrofoam cups, and all other instruments found in the lab. The thermometer only reaches 45 degrees celsius; therefore, thermodynamic equations need to be applied in order to find the original temperature of the hot water. We also had access to deionized water that was approximately room temperature.
electrophoresis gel and the device was turned on. Using the methods discussed above we found
A common tool that forensic units use is the ultra violet or UV light. Ultra violet light can detect different areas that contain blood that might not be able to be seen in other conditions. Another common tool is the blood reagent test that forensics use on scene. These tests determine if the blood is human or animal. Renee Blake - "The 'Renee Blake'" There are different types of bloodstain patterns that give a sense of what happened at the scene.
When there is a heat exchange between two objects, the object’s temperature will change. The rate at which this change will occur happens according to Newton’s Law of heating and cooling. This law states the rate of temperature change is directly proportional between the two objects. The data in this lab will exhibit that an object will stay in a state of temperature equilibrium, unless the object comes in contact with another object of a different temperature. Newton’s Law of Heat and Cooling can be understood by using this formula:
on how long it takes to heat up. If we heat a large volume of water it
Investigating Heat Loss From a Container Planning We are investigating heat loss from a container and how it is affected. We could change: Room temperature Surface area Amount of water Use a lid Insulate around it Colour of tin We could measure / observe: Amount of time Temperature We will change: Surface area We will measure / observe: Temperature (every minute for 5 minutes) Our question is: Does surface area effect the rate of heat loss? We will keep these the same: Colour of tin Room temperature Amount of water Use a lid Insulate around it Preliminary investigation = == ==
Specific heat capacity of aqueous solution (taken as water = 4.18 J.g-1.K-1). T = Temperature change (oK). We can thus determine the enthalpy changes of reaction 1 and reaction 2 using the mean (14) of the data obtained. Reaction 1: H = 50 x 4.18 x -2.12.
Tf-Ti). Next, subtract the initial temperature, 25 degrees from the final temperature, 29 degrees putting the change in temperature at 4 °C. To calculate the heat absorbed by the water in calorimeter, use the formula (q = mCΔT). Plug in 50 mL for (m), 4.184 J for (C) and 4 °C for the initial temperature (ΔT), then multiply.
After the water, has been boiling for 10 minutes, and the temperature inside the test tube has been stable for 5 minutes, record the temperature and remove the thermometer.
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Sweating and Heat Loss Investigation Aim To find out whether heat is lost faster over a sweaty body compared to a dry body. Apparatus 2 Boiling tubes 47ml max 2 Measuring jug 50ml max A Beaker 250ml max 2 thermometers Paper towels A kettle to boil water A stopwatch 2 magnifying glasses (8x) 2 corks with a small hole through the centre A test tube rack Preliminary work In my preliminary work, I need to find out how much water to use, whether the tissue should be wet with hot/cold water, how often the readings should be taken, how accurate should the readings be, how many readings should be taken and what my starting temperature should be. My results are as follows. Starting temperature of 40°c Time (secs) Wet towel (°c) Dry towel (°c) 30 36 38.9 60 35 38.5 90 34 37.9 120 33.9 37.5 150 33 37 180 32.6 36.9 210 32.3 36.8 240 31 36.5 270 30.4 36 300 30.3 35.9 Starting temperature of 65°c Time (secs) Wet towel (°c) Dry towel (°c) 30 51.1 53 60 48.2 51.9 90 46.4 51 120 46 50 150 44.3 49 180 42.9 48.4 210 42.6 46.9 240 41.7 48 270 40.2 47.5 300 39.3 47 Starting temperature of 60°c Time (secs) Wet towel (°c) Dry towel (°c)
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solutions and add them to a test tube rack. I will then cut up a
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