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Slav-nsk [51]
3 years ago
5

Which one is a physical change?

Chemistry
2 answers:
RoseWind [281]3 years ago
7 0

Answer:

B. Dry Ice Subliming

Explanation:

Dry ice undergoes a physical change when it sublimates from the solid to the gaseous state without first melting into a liquid

lozanna [386]3 years ago
6 0

Answer:

dry ice !

Explanation:

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(5points) Na2[Fe(OH2)2(OH)I3]absorbs photons with energy of 191kJ/mol. Calculate the wavelength (in nm) for a photon absorbed by
AfilCa [17]

Answer:

626.7nm

Explanation:

The energy of a photon is defined as:

E = hc / λ

<em>Where E is the energy of the photon, h is Planck constant (6.626x10⁻³⁴Js), c is speed of light (3x10⁸m/s) and </em>λ is the wavelength of light

The energy of 1 photon is:

(191000 J / mol) ₓ (1 mole / 6.022x10²³) = 3.1717x10⁻¹⁹ J

Replacing:

3.1717x10⁻¹⁹ J = <em>6.626x10⁻³⁴Jsₓ3x10⁸m/s /  </em>λ

λ = 6.267x10⁻⁷m

as 1nm = 1x10⁻⁹m:

6.267x10⁻⁷m ₓ (1nm / 1x10⁻⁹m) =

<h3>626.7nm</h3>
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What is gold atomic number
Korolek [52]

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79

Explanation:

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Activity C: Hydrolysis of Carbohydrates As discussed earlier, disaccharides are composed of two monosaccharides linked together.
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Explanation:

<em>What monosaccharides will result from the hydrolysis of sucrose?</em>

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