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3 years ago

What is a potential benefit of fuel cell cars?

Chemistry

2 answers:

abruzzese [7]3 years ago

5 0

Answer:

Explanation:

77julia77 [94]3 years ago

3 0

Answer:

no recharging necessary

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vWould radiation with a wavelength 0.91 nm or a frequency of 5.9×1011 s−1 be detected by an X-ray detector? Would radiation with

Bingel [31]

Answer:

Only the radiation with a wavelength 0.91 nm can be observed by an X-ray detector.

Explanation:

To answer this question we need to consult the ranges in which x rays are in the electromagnetic spectrum:

The X radiation in the electromagnetic spectrum fall in the region of:

frequency: 3 x 10¹⁶ Hz to 3 x 10¹⁹ Hz (1Hz = 1s⁻¹)

wavelengt: 1 pm to 10 nm

Comparing the values in our question,

0.91 nm will be detected

5.9 x 10¹¹ Hz will not be detected.

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3 years ago

A hydrogen electron is elevated from level 1 to level 2. Another electron is elevated from level 2 to level 4. The transition re

mario62 [17]

the 2to 4 transition is bigger

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3 years ago

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Difference between a row (“period”) & a column (“group”) on the periodic table and examples.

saw5 [17]

The rows are the one line of elements that goes from left to right horizontally. A column is a line of elements that goes vertically.

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3 years ago

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The following balanced equation shows the decomposition of water (H2O). According to the equation, how many oxygen atoms are in

coldgirl [10]

2 possibly 3 depends on if that of what looks like a zero is an O which it isn't so 2 but if it is 3.

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3 years ago

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two kilogram of nasialo4 zeolites are used in a water filter to remove calcium. after complete ion exchange the zeolite is remov

defon

After ion exchange with zeolite in water filter to remove calcium by substitute natrium ion with calcium ion, the weight of zeolite become 1.9578 kg.

ion exchange calculation can be done by using basic stoichiometry if we know how the reaction of the ion exchange. In this case where zeolite with natrium ion will be exchanged with calcium. The reaction of exchange will be like this:

$2NaSiAlO_{4} + Ca^{2+}$ ⇒ $Ca(SiAlO_{4}) _{2} + 2Na^{+}$

Calculate the molecule weight of both zeolite
Atomic weight data:
Na = 23 gram/mole

Si = 28 gram/mole

Al = 27 gram/mole

O = 16 gram/mole

Ca = 40 gram/mole

Molecule weight

$NaSiAlO_{4}$ = 142 gram/mole

$Ca(SiAlO_{4}) _{2}$ = 278 gram/mole

Calculate mole from 2kg of zeolite with natrium :

2000 gram/ 142 = 14.0845 mole

Based on the stoichiometry, we got the mole of zeolite with calcium:

14.0845 mole x 1/2 = 7.0423 mole

Weight of zeolite after the ion exchanged with calcium:

7.0423 mole x 278 = 1957.8 gram = 1.9578 kg

Learn more about ion exchange here: brainly.com/question/28203551

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1 year ago