IB Chemistry Topic R1.1.5 Practical Considerations Revision Notes (SL/HL)

IB Chemistry Topic R1.1.5 Practical Considerations Revision Notes (SL/HL) | RevisionDojo

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Calorimetry in Practice: Setup, Errors, and Corrections

Note

In R1.1.4 we saw how the equations $Q = mc\Delta T$ and $\Delta H = -Q/n$ give an enthalpy change from a temperature measurement.
This article looks at how that measurement is actually made and why the result is rarely exact.

Experimental Setup for Calorimetry

Definition

Calorimeter

A calorimeter is an apparatus designed to measure temperature changes, which can then be used to calculate the heat transferred during a reaction.

In a school laboratory, calorimetry is usually done with a coffee-cup calorimeter or a metal calorimeter.
The heat released or absorbed by the reaction is transferred to a known mass of water.
The temperature change of the water is measured and used to calculate the heat transferred.

Key Components of a Simple Calorimeter

Insulated container: often a polystyrene cup, which minimises heat loss to the surroundings.
Thermometer or temperature probe: measures the temperature change ($\Delta T$) of the water or solution.
Reaction vessel: the container where the reaction occurs, for example a metal can for combustion reactions.

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Note

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Calorimetry in Practice: Setup, Errors, and Corrections

Note

In R1.1.4 we saw how the equations $Q = mc\Delta T$ and $\Delta H = -Q/n$ give an enthalpy change from a temperature measurement.
This article looks at how that measurement is actually made and why the result is rarely exact.

Experimental Setup for Calorimetry

Definition

Calorimeter

A calorimeter is an apparatus designed to measure temperature changes, which can then be used to calculate the heat transferred during a reaction.

In a school laboratory, calorimetry is usually done with a coffee-cup calorimeter or a metal calorimeter.
The heat released or absorbed by the reaction is transferred to a known mass of water.
The temperature change of the water is measured and used to calculate the heat transferred.

Key Components of a Simple Calorimeter

Insulated container: often a polystyrene cup, which minimises heat loss to the surroundings.
Thermometer or temperature probe: measures the temperature change ($\Delta T$) of the water or solution.
Reaction vessel: the container where the reaction occurs, for example a metal can for combustion reactions.

Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Note

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.

Excepteur sint occaecat cupidatat non proident

Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

Structure 1. Models of the particulate nature of matter5 subtopics

Structure 2. Models of bonding and structure4 subtopics

Structure 3. Classification of matter2 subtopics

Reactivity 1. What drives chemical reactions?4 subtopics

Reactivity 2. How much, how fast and how far?3 subtopics

Reactivity 3. What are the mechanisms of chemical change?4 subtopics

IB Chemistry R1.1.5 Practical Considerations Notes

Structure 1. Models of the particulate nature of matter5 subtopics

Structure 2. Models of bonding and structure4 subtopics

Structure 3. Classification of matter2 subtopics

Reactivity 1. What drives chemical reactions?4 subtopics

Reactivity 2. How much, how fast and how far?3 subtopics

Reactivity 3. What are the mechanisms of chemical change?4 subtopics

Calorimetry in Practice: Setup, Errors, and Corrections

Experimental Setup for Calorimetry

Key Components of a Simple Calorimeter

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account

Calorimetry in Practice: Setup, Errors, and Corrections

Experimental Setup for Calorimetry

Key Components of a Simple Calorimeter

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account