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DENIUS [597]
3 years ago
7

How can you tell that a chemical change has occurred?

Chemistry
1 answer:
Alik [6]3 years ago
5 0

A. The products of the change are different from the starting

substances.

<u>Explanation:</u>

Whenever there is a physical change it may just affect the phase change but the properties remains the same. Whenever there is an occurrence of a chemical change, it was indicated by some of these things such as,

  • The products are exactly different from the products.
  • Chemical properties of these reactants are entirely different from that of the products.
  • Chemical composition as well as the physical properties of the reactants and the products will change
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The decomposition of a compound at 400⁰C is first order with half-life of 1570 seconds. what fraction of an initial amount of th
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Answer: After 4710 seconds, 1/8 of the compound will be left

Explanation:

Using the formulae

Nt/No = (1/2)^t/t1/2

Where

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No= amount of compound present at time t=0

t= time taken for N molecules of the compound to remain = 4710 seconds

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Plugging in the values, we have  

Nt/No = (1/2)^(4710s/1570s)

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