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3 years ago

Copper (II) nitrate, Cu(NO3)2, solution reacts with potassium hydroxide, KOH, to form a blue

Chemistry

1 answer:

Gekata [30.6K]3 years ago

6 0

Answer:

Copper(II) nitrate and potassium hydroxide are soluble ionic compounds, which implies that they dissociate completely when dissolved in water to produce ions. ... You can thus say that the balanced chemical equation that describes this double ... Cu(NO3)2(aq)+2KOH(aq)→Cu(OH)2(s)⏐⏐↓+2KNO3(aq).

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The half-life of a first-order reaction is 13 min. If the initial concentration of reactant is 0.13 M, it takes ________ min for

Zigmanuir [339]

Answer:

Therefore it takes 8.0 mins for it to decrease to 0.085 M

Explanation:

First order reaction: The rate of reaction is proportional to the concentration of reactant of power one is called first order reaction.

A→ product

Let the concentration of A = [A]

$\textrm{rate of reaction}=-\frac{d[A]}{dt} =k[A]$

$k=\frac{2.303}{t} log\frac{[A_0]}{[A]}$

[A₀] = initial concentration

[A]= final concentration

t= time

k= rate constant

Half life: Half life is time to reduce the concentration of reactant of its half.

$t_{\frac{1}{2} }=\frac{0.693}{k}$

Here $t_{\frac{1}{2} }=0.13 min$

$k=\frac{0.693}{t_{\frac{1}{2}} }$

$\Rightarrow k=\frac{0.693}{13 }$

To find the time takes for it to decrease to 0.085 we use the below equation

$k=\frac{2.303}{t} log\frac{[A_0]}{[A]}$

$\Rightarrow t=\frac{2.303}{k} log\frac{[A_0]}{[A]}$

Here , $k=\frac{0.693}{13 }$ , [A₀] = 0.13 m and [ A] = 0.085 M

$t=\frac{2.303}{\frac{0.693}{13} } log(\frac{0.13}{0.085})$

$\Rightarrow t= 7.97\approx 8.0$

Therefore it takes 8.0 mins for it to decrease to 0.085 M

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3 years ago

Which Scientists’ observations eventually led to the theory of continental drift?

Vitek1552 [10]

Alfred Wegener

Explanation:

Alfred Wegener in 1912, proposed the theory of continental drift from his careful studies of different land masses. From his observations, he suggested the following:

Some fossils of tropical plants were found in polar and temperate regions.
Fossils of mesosaurus were found in South America and South Africa now separated by the Atlantic ocean.
He fitted the continents into a giant land mass puzzles.
Coal beds in Europe were similar to those in United States.
Mountain chains in the edge of West Africa was similar to that of Eastern part of South America.

His theory lacked a mechanism which facilitated the plate movement.

Learn more:

Wegener brainly.com/question/5002949

#learnwithBrainly

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4 years ago

Of the 20 amino acids, how many amino acids are considered essential? why are they called essential?

Karo-lina-s [1.5K]

There are nine essential amino acids for humans (histadine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine) that must come from your … food.

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4 years ago

What is effective nuclear charge?

Amiraneli [1.4K]

Answer:

The effective nuclear charge (often symbolized as Zeff or Z*) is the net positive charge experienced by an electron in a multi-electron atom. The term “effective” is used because the shielding effect of negatively charged electrons prevents higher orbital electrons from experiencing the full nuclear charge.

Explanation:

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3 years ago

What is the atom number of helium

Maksim231197 [3]

The atomic number of helium is 2

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3 years ago

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