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sleet_krkn [62]
3 years ago
5

Wich of these is not a sign of chemical change 1 A gas is given off

Physics
1 answer:
mash [69]3 years ago
5 0
<h3>Answer:</h3>

2. The material dissolves

<h3>Explanation:</h3>

The Question tests the understanding of chemical change and whether we know the signs that show its occurrence.

First we need to know what is chemical change;

  • Chemical change is a type of change that involves formation of a new substance different from the original substance.

Second we need to identify the signs that indicate the occurrence of a chemical change

  • Chemical change in chemical reactions is characterized by various signs which include;
  1. Production of bubbles
  2. Color change
  3. Formation of a precipitate
  4. Change of odor
  5. Change in temperature.
  • Therefore, in this case, the material dissolving is not a sign that chemical change has taken place.
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s₁ = 4.9 t²

Now, we calculate the distance traveled by the car. For constant speed and time to be 1 second more than the police car time, due to car starting time, we get:

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Therefore,

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4.9 t² = 27.78 t + 27.78

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t = 6.5 s + 1 s

<u>t = 7.5 s</u>

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