Calorimeter

This lab was conducted to find the key differences between the quantity of heat (q) and ∆H of a substance. Different masses of substances CaCl2 and NH4NO3 were dissolved in water to see how changing mass impacts the q and ∆H of a substance. When the two substances dissolve, they become ions. CaCl2 dissolves in a reaction of: CaCl2 Ca2+aq + 2Cl1-aq while NH4NO3 dissolve in a reaction of: NH4NO3 NH41+aq + NO31-aq . As shown in these reactions, when ionic compounds dissolve in water, they break…

The objective of the lab is to find the calorimeter we used by determining the heat given off from pringles and calculate how much energy was released by the burning food substance. In addition, we can also use the concept of conservation of energy that energy cannot be created or destroyed. Introduction In order to complete the snack energy lab, calorie and calorimetry will be use as a major technique. By burning pieces of food, the chemical energy stored in molecular bonds is released as heat…

Bomb calorimeters have to withstand the large pressure within the calorimeter as the reaction is being measured. Electrical energy is used to ignite the fuel; as the fuel is burning, it will heat up the surrounding air, which expands and escapes through a tube that leads the air out of the calorimeter. When the air is escaping through the copper tube it will also heat up the water outside the tube. The…

Any process that generates heat or exchanges it with its environment can be used in a calorimeter. Calorimetry has a very broad range of uses such as, drug design in pharmaceutical industry, or even the study of metabolic rates in biological systems. Hess’ law allows the experimenter to add up all the enthalpies of multiple reactions or stages…

Aim: To investigate the effect of change in length of the carbon chain and the position of the functional group (-OH group) on the enthalpy of combustion of alcohol Variables: Table 1.1: List of all variables used in the experiment Type of Variable Name of the Variable (For trial 1: To investigate the effect of change in length of carbon chain on the enthalpy of combustion of alcohol) Name of the variable (for trial 2: To investigate the effect of change in position of the OH group on the…

the salt with the most positive temperature gain was the most exothermic. This salt was used to complete part B. Part B In part B, the salt/ water mixture was optimized to produce the correct amount of heat. After adding 70mL of tap water to the calorimeter, the temperature probe was inserted to record. After around 1 minute of recording, 9.8g of CaCl was added. The mixture was then agitated with a stirring rod as the salt dissolved, temperature increased sharply until it reached a plateau. The…

What is boiling point elevation? How might this have affected your results? Boiling point elevation is the event in which the boiling point of a liquid becomes higher because of an added compound. Ultimately, the boiling point of the solution obtains a higher boiling point than a pure solvent like water. For the lab that was conducted, the solvent that was used was tap water and that itself contained numerous minerals dissolved in it and a variety of chemicals. Boiling point elevation is…

Determining the Latent Heat of Vaporisation of Nitrogen Abstract The aim of this experiment was to determine the latent heat of vaporisation of nitrogen. To do this, a resistor connected to a power supply was used to heat up liquid nitrogen. Measuring the current and resistance in the circuit gave the power supplied to the liquid nitrogen and measuring how long it took for a fixed amount of nitrogen gas to be produced gave the rate of evolution of nitrogen gas. Plotting the power against…

"What are the energy requirements for this specific patient?" this is a frequently asked question of dieticians and doctors in the clinical setting. Resting energy expenditure (REE) is the largest component (~65-75%) of the total energy expenditure, which differs per individual [1, 2]. Variation of REE in individuals of the same age, sex and weight is related to body composition. Individuals with a higher fat-free mass (FFM) will have a higher REE [3]. Children and adolescents differ in…

On the experiment 1 solvent abilities: All solutes were expected to dissolve in water because water is known as “universal solvent.” Observation showed that many salts and sugars were able to fully dissolve in the water solvent, but corn oil did not (Figure1).The reason salts would dissolve into water solvent because water molecule carried partial positive charge on hydrogen atom and partial negative charge on oxygen atom; they could react with cation and anion from salts that have ionic bonds…