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The change in color indicates that a chemical reaction has taken place.
You might observe a change in color, gas bubbles being formed, a change in temperature (this might require the use of a thermometer, unless the solution actually boils), or you can test for a specific chemical by using an indicator, or analyse the solution by means of a mass spectrometer. Explosions are also a very convincing form of evidence that a chemical change has taken place.
Fossils show evidence of evolution by showing a picture to the past and through some methods how DNA of one animal may be similar to that of a modern animal.
a reaction has taken place when one or more of the following occur : - a new substance is formed - change in colour - precipitate is formed
karyotypes are taken during metaphase
Physical changes give no evidence that a chemical reaction has taken place, because no chemical reaction has taken place.
a legal witness to attest that a transaction has taken place between people.
a legal witness to attest that a transaction has taken place between people.
A sale is the transaction taken place by two parties exchanging money or services for products or services. A return is bringing that transaction and products back to the party it was "sold" by for money to be refunded. A sale is the transaction taken place by two parties exchanging money or services for products or services. A return is bringing that transaction and products back to the party it was "sold" by for money to be refunded.
Answering "Any observable change in behaviour is prima-facie evidence that learning has taken place?"
when you burn coal, it burns thecoal and the oxygen in the air and forms carbon dioxide. carbon + oxygen -> carbon dioxide
The change in color indicates that a chemical reaction has taken place.
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The is no evidence at all that the Philadelphia Project ever existed and in fact there is a lot of evidence indicating that it was not real. Basically, the story is a hoax.
A 'foreign card transaction' - is any transaction on your card that has taken place outside your home country. For example - say you live in the UK, and you go to Spain, using your card while you're there... Any purchases or cash advances made on your card would show up as a 'foreign card transaction'.
no,it is just an acknowledgement taken by the user from the provider.