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3 years ago

recheck Fusion reactions power the in space. Humans currently use fusion in , but researchers are seeking more applications.

Chemistry

1 answer:

quester [9]3 years ago

4 0

One: looks to be correct for both answers. Certainly the first one is. The second depends on your other choices. But military use is one.

Two: is correct. Pd has (in this case) an atomic mass of 114 and its number is 46

Three: Even with my slop numbers, 4.98 is the answer (although I get 4.99 but again, my numbers are pretty sloppy).

Four: Slop numbers say 78.3, but 78 is the right answer.

Five: Slop numbers agree with Al2S3. I think that's D

They are all correct. Very Fine Work.

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Riya rides his bike 63 miles in 270 minutes. What is his average speed in miles per hour? Be sure to include the equation for sp

antoniya [11.8K]

Time t=270 minutes=270/60=9/2 hours
distance s=63 miles
average speed v=s/t=63 ÷ $\frac{9}{2}$
=63× $\frac{2}{9}$
=14 miles/hour

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3 years ago

Is H+ an acid, a base, or is it neutral?

Shkiper50 [21]

Actually for this question answer is Acid. but to know more accurately..... comment !

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2 years ago

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The Balmer series consists of the spectral lines from hydrogen for an electron making a transition from an excited state to the

MaRussiya [10]

Answer:

Wavelength of the first four spectral line:

$\lambda_1=1216{\AA}$

$\lambda_2=1026{\AA}$

$\lambda_3=972.8{\AA}$

$\lambda_4=950{\AA}$

Explanation:

Lman series when electron from higher shell number and jumps to 1st shell then all the possible lines is called as lyman series.

to calculate wavelength of first four spectral line:

For hydrogen Z=1;

by using rydberg equation

$\frac{1}{\lambda} =RZ^2[\frac{1}{n_1^2} -\frac{1}{n_2^2} ]$

1. n=2 to n=1

$\frac{1}{\lambda} =RZ^2[\frac{1}{n_1^2} -\frac{1}{n_2^2} ]$

$\frac{1}{R} =912{\AA}$ =rydberg constant

$\lambda=\frac{4}{3R}$

$\lambda_1=1216{\AA}$

2. n=3 to n=1

$\lambda=\frac{9}{8R}$

$\lambda_2=1026{\AA}$

3. n=4 to n=1

$\lambda=\frac{16}{15R}$

$\lambda_3=972.8{\AA}$

4. n=5 to n=1

$\lambda=\frac{25}{24R}$

$\lambda_4=950{\AA}$

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3 years ago

An element's atomic number is 68. How many protons would an atom of this element have?

Evgen [1.6K]

Answer: 68.

Explanation:

The atomic number is the number that idenfities an element.

The atomic number is the number of protons of an element.

Every element has a different number of protons.

The elements are arranged in the periodic table as per their atomic number (number of protons).

The first element is hydrogen (H), its atomic number is 1, and it has 1 proton.

The second element is helium (He), its atomic number is 2 (it has 2 protons)-

Those two elements form the first period (row) of the periodic table.

The second row (period) has the elements Li, Be, B, C, N, O, F and Ne, whose respective atomic numbers (number of protons are) 3, 4, 5, 6, 7, 8, 9, and 10, respectively.

And so, you may idenfity each of the 118 elements known, with a different atomic number (number of protons).

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3 years ago

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What's the word of a theory that states that earths crust and upper mantle are broken into sections which move around on a speci

zaharov [31]

The Plate Tectonic Theory

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