Chemical Reaction or Physical Change?

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Henry asked an interesting question today – Is welding a physical change or a chemical reaction? To find out we need to think about the following questions:

  • Can the change be easily reversed?
  • Are there new products formed?
  • Is there a change in colour?
  • Are there any gases or precipitates formed?

You can read more about the science of welding here.

Some welding videos here.

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