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Please explain for me in simple clear words what does my chemistry instructor mean by the sentence below?
She has said: Nest two Styrofoam coffee cups, equip them with a stir bar, and place them on top of a magnetic stirrer, using a 3'' iron ring to hold them securely in place.
1) WHAT IS A STIR BAR?
2) WHAT IS A MAGNETIC STIRRER?
3) WHAT DOES 3'' IRON RING MEAN? IS 3'' THE SIZE OF THIS RING??
1) WHAT IS A STIR BAR?
It is a small oval magnet (the size of a large vitamin pill), usually coated in plastic that works with the magnetic stirrer to stir liquids. You can buy these.
2) WHAT IS A MAGNETIC STIRRER?
The plate that makes the stir bar work by changing polarity.
3) WHAT DOES 3'' IRON RING MEAN? IS 3'' THE SIZE OF THIS RING??
It's the diameter of the ring.
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US $3.45





