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3 years ago

A substance undergoes a change. Which of the following indicates that the change was a chemical change?

Chemistry

2 answers:

JulijaS [17]3 years ago

7 0

Answer;

-New molecules formed

Explanation;

-Chemical changes are type of changes that occurs when substances combine to form a new substance. They occur as a result of chemical reaction. During a chemical reactions, the atoms within a substance are rearranged into different combinations.

-Examples of chemical changes include; rusting of iron, heating sugar to form caramel, baking a cake, digesting food among others.

valentina_108 [34]3 years ago

5 0

New molecules would form.
the other three are examples of a physical change

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yuradex [85]

Answer:

$\boxed{\text{2408 min}}$

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$\ln\dfrac{N_{0}}{N_{t}} = kt$

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$\begin{array}{rcl}\ln \dfrac{100}{90} & = & k \times 366\\\\1.054 & = & 366k\\\\k & = & \dfrac{1.054 }{366}\\\\k & = & 2.879 \times 10^{-4} \text{ min}^{-1}\\\end{array}\\\\$

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