Gas laws, investigate quantitatively the relationship between the pressure and volume for nitrogen gas.

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IB Chemistry :Sample Lab Report

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Investigate a Gas Law

Assessment Criteria; Planning a, Planning b, Data Collection, Data Processing,

Conclusion and Evaluation

Planning a

Focused Research Question:

To investigate quantitatively the relationship between the pressure and volume for

nitrogen gas.

Hypothesis and explanation:

Pressure in a closed container is due to the bombardment of the gas particles with the

walls of the container. The pressure thus depends on the number of molecules striking

the walls of the container per unit time, and how forceful the collisions are. If temperature

of the gas is kept constant, the average kinetic energy of the gas particles remains the

same according to the kinetic theory of gases. This means the average velocity and the

force of collision will be the same. For example, if the volume of a fixed mass of a gas is

decreased to half is volume, the same number of particles will now collide twice as

frequently with the walls of the container in half the volume, and the pressure (which is

force per unit volume) will double. Thus for a fixed mass of gas at a constant

temperature, the pressure should be inversely proportional to the volume of the

container.

Variables:

Independent Variable (variable to be manipulated); volume of the nitrogen gas

Dependent Variable; the pressure of the gas

Controlled Variables; the type of gas, mass (or amount) of the gas, temperature of gas

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Planning b

Apparatus and Materials:

A pressure gauge, the type used to measure tire pressure (a mechanical pressure

gauge) was used.

A gas syringe with plunger (glass if possible); eventually a 20 cm3 plastic syringe was

used.

Stand with clamp to hold pressure gauge in place.

Tough / rigid plastic tubing(not the soft rubber kind) to connect gauge and syringe

Source of nitrogen gas - an N2 tank that was securely attached to the working bench and

only operated by the teacher for safety reasons.

Stopcock grease.

Design for the control of variables:

1. The pressure gauge was attached to ...

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