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3 years ago

The tip of a match is ignited as it is struck against the matchbox. Why is this a chemical change?

Chemistry

2 answers:

Rufina [12.5K]3 years ago

8 0

The tip of the match is flammable its FLVS I did this and realy ITS MELTING ITS COLERFUL LOL omg is up with the awsners

LUCKY_DIMON [66]3 years ago

5 0

The answer is A, because of the chemical reaction taking place color can change (as in this case). Hope it helps!

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If a substance has a half life of 58 years and starts with 500 g radioactive, how much remains radioactive after 30 years?

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Answer:

A = 349 g.

Explanation:

Hello there!

In this case, since the radioactive decay kinetic model is based on the first-order kinetics whose integrated rate law is:

$A=Ao*exp(-kt)$

We can firstly calculate the rate constant given the half-life as shown below:

$k=\frac{ln(2)}{t_{1/2}} =\frac{ln(2)}{58year}=0.012year^{-1}$

Therefore, we can next plug in the rate constant, elapsed time and initial mass of the radioactive to obtain:

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