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2 years ago

What is the general formula for a secondary amine? rnh2 h2nrnh2 rn2h r2nh

1 answer:

4 0

The general fomula of the amine group ought to be R2NH because, the two hydrogen atoms of ammonia have been substituted by alkyl groups.

<h3>What is a secondary amine?</h3>

A secondary amine is one in which two alkyl groups are subtituted on the nitrohen atom of ammonia.

This implies that the general fomula of the amine group ought to be R2NH. This is because, the two hydrogen atoms of ammonia have been substituted by alkyl groups.

Learn more about secondary amine: brainly.com/question/12682525

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What is an isotope? Give an example (use the full name! Simply listing the element is not a correct answer!)

Alina [70]

Answer:

Isotopes are variations of chemical elements that have the same number of protons but different number of neutrons.

Explanation:

3 0

3 years ago

Use the Rydberg equation to calculate the wavelength (in Å) of the photon absorbed when a hydrogen atom undergoes a transition f

ivolga24 [154]

Answer:

1024Å

Explanation:

The Rydberg equation is an empirical relationship equation expressed by Balmer and Rydberg which is given as:

1/λ = $R_{H} (\frac{1}{n_{f} ^{2} }-\frac{1}{n_{i} ^{2} } )$ .............................(1)

where $R_{H}$ is the Rydberg constant given as $1.09 x 10^{7}m^{-1}$ , n is the transition level and the subscript f and i show the final and initial level numbers respectively. λ is the wavelength.

$n_{f}$ = 1

$n_{i} = 3$

Using equation (1), we have

1/λ $= 1.097 x 10^{7}(\frac{1}{3^{2} }- \frac{1}{1^{2} })$

= $1.097 x 10^{7} (\frac{1}{9} -\frac{1}{1} )$

= $1.097 x 10^{7}(0.11-1)$

= $1.097 x 10^{7} (-0.89)$

= - 9763300

λ = $-\frac{1}{9763300}$

= $-1.024x 10^{-7}m$

We should note that the negative sign we have is as a result of photon absorption whereby the hydrogen atom gains energy to undergo a transition from the lower energy level to a higher one. Wavelength does not have a negative value.

To convert to Å, we have

λ = $\frac{1.024 x 10^{-7} }{10^{-10} }$ = 1024Å

Therefore the wavelength of the photon in Å is 1024Å

7 0

3 years ago

What element breaks down into yttrium-90?

atroni [7]

The correct answer is Strontium-90.

Strontium-90 breaks down into yttrium-90.

Strontium-90 is a radioactive isotope of strontium. It undergoes β− decay into yttrium-90. A decay energy of 0.546 MeV is also released.

⁹⁰₃₈Sr -> ⁰₋₁e + ⁹⁰₃₉Yr

Beta particle has the charge and mass of an electron. Upon the release of a beta particle, the mass number of Sr remains unchanged but the atomic number of Sr increases by 1. As a result both Sr and Yt have mass number 90, however, Sr and Yt have atomic numbers 38 and 39 respectively.

8 0

3 years ago

"how many fold difference is the hydrogen ion concentration if the ph is 6.7 is increased to 8.7"

Nina [5.8K]

pH of the solution is calculated using the following formula:

$pH=-log{[H^{+}]}$

Here, $[H^{+}]$ is concentration of hydrogen ion.

Initial value of pH is 6.7, calculate concentration of hydrogen ion from this as follows:

$[H^{+}]=10^{-pH}$

Putting the value,

$[H^{+}]=10^{-6.7}=1.9952\times 10^{-7}$

Thus, initial concentration of hydrogen ion is $1.9952\times 10^{-7}$ .

Now, final pH value is 8.7, calculate concentration of hydrogen ion as follows:

$[H^{+}]=10^{-8.7}=1.9952\times 10^{-9}$

Thus, final concentration of hydrogen ion is $1.9952\times 10^{-9}$ .

The ratio of final to initial value will be:

$\frac{1.9952\times 10^{-9}}{1.9952\times 10^{-7}}=\frac{1}{100}$

Thus, if pH increases from 6.7 to 8.7, concentration of hydrogen ion becomes $\frac{1}{100}$ of the initial value.

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3 years ago

How does weathering break down or change rocks

tatyana61 [14]

Well weathering adds different elements to rocks which they might not be used to. For example, very hard rain & harsh winds could push a rock, causing it to fall & break off into smaller rocks.

3 0

3 years ago