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shutvik [7]
3 years ago
12

Which of the substances are elements please help

Chemistry
1 answer:
ivanzaharov [21]3 years ago
6 0

Answer:

Substances 1 and 2

Explanation:

an element only has 1 kind of atoms :3

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The answer is D . I hope this help you :) .
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2 years ago
The wavelength of a particular color of violet light is 433 nm. The energy of this wavelength of light is kJ/photon. (109 nm = 1
mash [69]

Answer:

4.59 × 10⁻³⁶ kJ/photon

Explanation:

Step 1: Given and required data

  • Wavelength of the violet light (λ): 433 nm
  • Planck's constant (h): 6.63 × 10⁻³⁴ J.s
  • Speed of light (c): 3.00 × 10⁸ m/s

Step 2: Convert "λ" to meters

We will use the conversion factor 1 m = 10⁹ nm.

433 nm × 1 m/10⁹ nm = 4.33 × 10⁷ m

Step 3: Calculate the energy (E) of the photon

We will use the Planck-Einstein's relation.

E = h × c/λ

E = 6.63 × 10⁻³⁴ J.s × (3.00 × 10⁸ m/s)/4.33 × 10⁷ m

E = 4.59 × 10⁻³³ J = 4.59 × 10⁻³⁶ kJ

5 0
3 years ago
What is the difference between hydrophilic and hydrophobic?
Nataliya [291]
Hydrophilic - attracted to water
Hydrophobic - resists water
7 0
2 years ago
Which lists the waves in order of frequency, from highest to lowest?
Ulleksa [173]

Answer:

C

Explanation:

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3 years ago
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The principal that states that an object at rest will stay at rest and that an object in motion will stay in motion is the law o
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Answer: <em>Newton's first law</em>

Explanation: <em>The idea that objects only change their velocity due to a force is encapsulated in Newton's first law. Newton's first law: An object at rest remains at rest, or if in motion, remains in motion at a constant velocity unless acted on by a net external force.</em>

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3 years ago
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