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hjlf
3 years ago
8

PLEASE HELP!!!!!!!

Chemistry
1 answer:
svetoff [14.1K]3 years ago
4 0
Mass and number of atoms always stay the same
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3. A helium laser emits light with a wavelength of 6.33 x 10^-7m. What is
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Answer:

4.52 x 10¹⁴ cycles/s

Explanation:

From c = f·λ => f = c/λ = (3.0 x 10⁸ m/s)/(6.63 x 10⁻⁷m) = 4.52 x 10¹⁴ cycles/s.

f = frequency = ?

λ = wavelength = 6.63 x 10⁻⁷ meter

c = speed of light in vacuum = 3.0 x 10⁸ meters/s

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3 years ago
One brand of vinegar has a pH of 4.5. Another brand has a pH of 5.0. The equation for the pH of a substance is pH = –log[H+], wh
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[H+] in first brand:
4.5 = -log([H+])
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[H+] in second brand:
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Difference = 10^(-4.5) - 10^(-5)
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3 years ago
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Answer: The closeness, arrangement and motion of the particles in a substance change when it changes state. Materials are a store of internal energy , due to the motion of particles and the chemical bonds between them. When a substance is heated, its internal energy increases: the movement of its particles increases.

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