Explanation:
the investigation lasts for 7 days.
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The type of reaction that occurs without the addition of heat is called spontaneous reaction. That is option D.
<h3>What is spontaneous reaction?</h3>
Spontaneous reaction is defined as the reaction where by new substances are formed naturally without the addition of extra energy in the form of heat.
Therefore, the type of reaction that occurs without the addition of heat is called spontaneous reaction
Learn more about heat here:
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The color emitted be larger atoms is lower in energy then the light emitted by smaller atoms
describes what occurs every time in a given situation
The major species in solution when solid ammonium bromate is dissolved in water is shown below
