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3 years ago

BRAINLIESTTT ASAP!!! PLEASE HELP ME :)

Chemistry

2 answers:

Afina-wow [57]3 years ago

8 0

1 Science is certain about ending up with the actual explanation while pseudoscience does not ensure that.

2 Science is involved with a set of principles to work, while pseudoscience is not operated in a unique method.

3 Science is based on tangible or perceptible evidence, but pseudoscience could be based on some superficial or outlandish concepts.

4 Science result the truth while pseudoscience results the myth.

Leno4ka [110]3 years ago

3 0

Criteria that define true science include scientific experimentation, replication of results,and peer review. Beliefs and claims that do not meet these criteria are called pseudoscience. What is the difference between science and pseudoscience? ... A scientific theory attempts to explain an observation.

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Rudiy27

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3 years ago

What is the half-life of an isotope that decays to 12.5% of its original activity in 19.8 hours?

katen-ka-za [31]

$x= x_{0} e^{kt} ,where~ x ~is~ the ~ |amount\ of \material\ at\ any~~time~t
$
$and~ x_{0} ~the~original~amount.$
$when~x= \frac{12.5}{100} x_{0} }= \frac{125}{1000} x_{0}$
$\frac{x}{ x_{0} } = \frac{125}{1000}= \frac{1}{8}$
$when t=19.8 hrs,
x= x_{0} e^{19.8 k}, 
 \frac{x}{ x_{0} } = e^{19.8 k}, 
 \frac{1}{8} = e^{19.8k} ,
ln \frac{1}{8} =19.8 k,
$
$ln1-ln8=19.8k,
0-ln 2^{3} =19.8 k,
-3 ln2=19.8k
k= \frac{-3 ln2}{19.8} = \frac{- ln 2}{6.6}$ $x= x_{0} e^{ \frac{-ln2}{6.6}t } ,
 \frac{x}{ x_{0} } = e^{ \frac{- ln 2}{6.6}t } 
$ $\frac{1}{2} = e^{ \frac{- ln2}{6.6}t } = \frac{1}{ e^{ \frac{ln 2}{6.6} t} } ,
2= e^{ \frac{ln2}{6.6}t } ,
ln2=ln e^{ \frac{ln 2}{6.6}t } = \frac{ln 2}{6.6} t~ln e= \frac{ln2}{6.6} t,$

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4 years ago