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3 years ago

14

HELP!! 50 POINTS! PLEASE ANSWER AND EXPLAIN WHY:

1 answer:

Vikki [24]3 years ago

8 0

Answer:

The correct set of measurement is D

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Which chemicals are major contributors to ozone layer destruction? Select two answer choices.

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Answer: <em>Chlorine and Bromine</em>

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What does Le Châtelier's principle say about upsetting a system at

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C

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Why are significant figures rules for calculations more important in science than in math class?

inysia [295]

Answer:

The importance of significant figures

As stated before, it is important within the science fields that you are not more precise or accurate than the least accurate or precise number. In science, it is generally agreed upon that the last number digit in any figure is filled with uncertainty.

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3 years ago

When an electron in a 2p orbital of a particular atom makes a transition to the 2s orbital, a photon of approximate wavelength 6

Mariulka [41]

Answer:

The energy difference between these 2p and 2s orbitals is $3.07\times 10^{-19} J$

Explanation:

Wavelength of the photon emitted = $\lambda =646.3 nm =646.3\times 10^{-9} m$

Energy of the photon will corresponds to the energy difference between 2p and 2s orbital = E

Energy of the photon is given by Planck's equation:

$E=\frac{hc}{\lambda }$

h = Planck's constant = $6.626\tiomes 10^{-34} Js$

c = Speed of the light = $3\times 10^8 m/s$

$E=\frac{6.626\tiomes 10^{-34} Js\times 3\times 10^8 m/s}{646.3\times 10^{-9} m}$

$E=3.07\times 10^{-19} J$

The energy difference between these 2p and 2s orbitals is $3.07\times 10^{-19} J$

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4 years ago

2. What do acidic solutions have high concentrations of?

Xelga [282]

Hydrogen ions
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