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Yuri [45]
3 years ago
5

Why is it important for scientists to keep testing a hypothesis even after they've found it to be true?

Chemistry
2 answers:
Alexus [3.1K]3 years ago
8 0

Answer:

as the world is changing we change also

Explanation:

We must always check and recheck are a hypothesis

Pepsi [2]3 years ago
8 0

Answer:

Explanation:

Because sometimes in the details of an experiment there are details hidden away that no one has thought to exploit.

I like to use Cancer as an example. Most cancers have drugs associated with them that are actually poisons (although  scientists are getting much, much better in reducing side effects).

But the main purpose until recently is an example of survival of the fittest. Think Darwin.  The drug kills off the cancer cells that are most easily killed off. That leaves the slower growing more deadly forms of the cancer behind and they finish the job, because there is nothing to control them, nor is anything competing with them.

Without finding this out, biologists would be at a loss of where to turn. Oncologists repeat the same treatment hundreds of times until the have a feel for how the cancer works. Then they are better equipped to tackle the problem a new.

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4. Cuál es la aplicación de las reacciones de óxido-reducción en la vida diaria y en la industria?
12345 [234]

Answer:

<em>Dentro de las aplicaciones de la óxido-reducción se pueden encontrar:</em>

  1. <u><em>La obtención del aluminio a partir de la alúmina y la electrolisis.</em></u>
  2. <u><em>La obtención de cloro, hidrógeno e hidróxido de sodio a partir del cloruro de sodio y la electrolisis.</em></u>
  3. <u><em>La combustión interna de un motor a gasolina u otro combustible fósil.</em></u>
  4. <u><em>Las termoeléctricas, las cuales para generar energía realizan combustión de carbón.</em></u>
  5. <u><em>La galvanoplastia, donde para evitar la corrosión de un metal se recubre con otro metal más resistente, por ejemplo: el recubrimiento del acero con zinc.</em></u>
  6. <u><em>La pilas o baterías de las cuales se obtiene energía química</em></u><em>.</em>

Explanation:

<em>Como puedes ver en la respuesta, la óxido-reducción tiene diversas aplicaciones en la vida moderna, desde todos los tipos de combustión los cuales sirven para brindar energía o movilizarte, hasta todas las funciones que se le ha dado a la electrolisis y a la obtención de la energía por medios químicos, incluso se puede considerar una aplicación de la óxido-reducción la incorporación de antioxidantes en los alimentos, los cuales disminuyen la velocidad de descomposición de los mismos. </em>

3 0
3 years ago
How many particles are in 12.47 grams of NaCl?
jeka94
If we are talking about moles then the answer to that is 0.22
5 0
3 years ago
What happens to a reaction at equilibrium when a reactant is removed from the reaction system
Firlakuza [10]
When a reactant is removed based on a reaction at equilibrium, the condition favors the backward reaction. This obeys the Le Chatelier's principle which states that any disturbance in the system shall be dealt in a way that the system counters that disturbance.
8 0
3 years ago
3.8x10^-4 g is dissolved into 450g of water . Find the concentration in ppm
IrinaK [193]

Answer:

0.84ppm

Explanation:

  Mass of solute  = 3.8 x 10⁻⁴g

  Mass of solution  = 450g

Unknown is the concentration in ppm; parts per million

The parts per million is one of the units of representing small concentration of solutes in a solution.

Solutes are the substances dissolving in another to give solution.

Here the concentration is expressed in a million units.

Concentration in ppm  = \frac{mass of solute}{mass of solution}  x 10⁶

                                     = \frac{3.8 x 10^{-4} }{450}   x 10⁶

                                     = 0.84ppm

4 0
3 years ago
When the following solutions are mixed together, what precipitate (if any) will form? a. FeSO4(aq) 1 KCl(aq) b. Al(NO3)3(aq) 1 B
noname [10]

Answer: Precipitates form only in (b) (c) and (d) and these are Al(OH)_3  , CaSO_4 and NiS respectively.

Explanation: (a) The reaction will be:

FeSO_4(aq)+2KCl(aq)\rightarrow FeCl_2(aq)+K_2SO_4(aq)

The reaction will not take place as both the products are soluble and so no precipitate will form.

(b) The reaction will be:

2Al(NO_3)_3(aq)+3Ba(OH)_2(aq)\rightarrow 3Ba(NO_3)_2(aq)+2Al(OH)_3(s)

This reaction will take place as aluminum hydroxide is insoluble. So, the precipitate formed in this reaction is Al(OH)_3 .

(c) The reaction will be:

CaCl_2(aq)+Na_2SO_4(aq)\rightarrow 2NaCl(aq)+CaSO_4(s)

This reaction will take place as a precipitate of calcium sulfate(slightly soluble) will form.

(d) The reaction will be:

K_2S(aq)+Ni(NO_3)_2(aq)\rightarrow 2KNO_3(aq)+NiS(s)

This reaction will take place as NiS is insoluble. So, the precipitate formed in this reaction is NiS.

8 0
3 years ago
Read 2 more answers
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