Chemistry Design Prac

Investigate the effect of one Chemistry related factor on the deflection of the liquid flow in the presence of a charged rod.

Research Question: How would the degree of deflection of a stream of water be affected by the temperature of the water?

Background Information:

Water molecules are polarized, this means that these molecules consist of a negatively charged side and a positively charged side. When placed near a charged object, such as a glass rod that has been rubbed repetitively, this causes the rod to become charged, meaning that if a stream of liquid water is to come close to the rod, it would become attracted to the rod because of its polarity.

Whether the rod is positively or negatively charged does not affect the direction of the deflection of the stream of liquid water because if the rod is positively charged the water molecules will be attracted to the rod due to the negatively charged side of the water molecules. But if the rod is negatively charged, the stream of liquid water will also become attracted to the rod as the positive side of the water molecules will be attracted to the negatively charged rod. This is because water is liquid, therefore the individual molecules can move freely, allowing for the water molecules to rotate to the desired position to become attracted to the rod.

The rod has become charged due to the repeated motion of rubbing the cloth on the rod, this is because the electrons from the rod are transferred to the cloth, making the rod positively charged.

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Viscosity of a liquid can be affected by the temperature of the liquid. It is stated that if the temperature of a liquid is increased, the viscosity of that liquid will decrease. This can be shown through the example of cooking oil in a frying pan, when the cooking oil is first poured into the frying pan, it is very thick, but when the temperature of the cooking oil has risen, the cooking oil becomes more fluid, meaning that the viscosity has decreased.

Hypothesis: The degree of deflection of a stream of water at a higher temperature will be deflected ...

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