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4 years ago

11

Substances can undergo physical changes or chemical changes. what is the difference between these two kinds of changes

2 answers:

soldi70 [24.7K]4 years ago

8 0

Physical changes are those change which just externally or physically change the state of the object . for example : water boils and evaporates... here the state is just changing from liquid to vapour while the composition is the same.

chemical changes are those which bring about a change in the composition of a substance. for example: burning of paper changes into ash .

slamgirl [31]4 years ago

6 0

There are several differences between<span> a </span>physical and chemical change<span> in matter or substances. A </span>physical change<span> in a substance doesn't </span>change<span> what the substance is. In a </span>chemical change<span> where there is a </span>chemical reaction<span>, a new substance is formed and energy is either given off or absorbed.</span>

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Answer:

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Explanation:

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Using the formula

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$\frac{\initial\;voltage}{final\;voltage}=(\frac{initial\;time}{final\;time})^2$

Using the formula

$\frac{V_1}{V_2}=(\frac{6.36}{t})^2$

$\frac{2.43\times 10^{-4}}{0.351}=\frac{(6.36)^2}{t^2}$

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$t=\sqrt{\frac{(6.36)^2\times 0.351}{2.43\times 10^{-4}}}$

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