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ss7ja [257]
3 years ago
11

Question 4(Multiple Choice Worth 1 points)

Chemistry
2 answers:
zepelin [54]3 years ago
7 0

Answer:

OJ.J. Thomson

Explanation:

Anuta_ua [19.1K]3 years ago
4 0
The answer is J.J Thomson
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Which two terms relate and why? Energy level, neutron, spectral line
andre [41]

Energy level and spectral line

Explanation:

The energy levels and their spectral lines are related.

Based on the Bohr's model of the atom, he suggested that electrons occupy specific spherical orbits.

These orbits are called energy levels around the nucleus.

The spectral lines are the different colors emitted by atoms when they absorb or lose energy.

  • Electrons can transition between different energy levels when they acquire enough energy that corresponds to that of the energy level
  • By doing so, they emit energy in the process and this is seen as visible spectral lines.
  • Spectral lines are usually studies in order to gain more information about the properties of atoms.

learn more:

Spectral lines brainly.com/question/1857156

#learnwithBrainly

6 0
4 years ago
Which of the following is NOT something that Earth's atmosphere protects us from? A. meteoroids B. ultraviolet light C. greenhou
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3 years ago
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Which option describes the direction of thermal energy transfer in earth's oceans?
BlackZzzverrR [31]

Answer:

Energy is moved from areas of surplus to those of deficit, with warm currents transporting warm water polewards and cold currents taking colder water to lower latitudes. It holds onto this heat for longer than the land does and the ocean currents move this heat around, from the tropics to higher latitudes.

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an electron travels in a vacuum tube that is 2 meters in length .002 seconds what is the average speed of the electron during th
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You are given stocks of 4 M NaCl, 40% Glucose, and 1M Tris-HCl (pH 8.5). You need to make 400 ml of a buffer containing 0.5 M Na
OLga [1]

Answer:

50mL of 4M NaCl, 80mL of 40% glucose, 20mL of 1M Tris-HCl (pH 8.5) and 250mL of water.

Explanation:

To make 400mL containing 0.5M NaCl you need to add:

4M / 0.5M = 8 (dilution 1/8). 400mL / 8 = <em>50 mL of 4M NaCl.</em>

Glucose 8% you need to add:

40% / 8% = 5 (dilution 1/5). 400mL / 5 = <em>80 mL of 40% glucose </em>

Buffer 50mM you need to add:

1000mM / 50mM = 20 (dilution 1/20). 400mL / 20 = <em>20mL of 1M Tris-HCl (pH 8.5)</em>

<em></em>

The resting volume: 400mL - 50mL of 4M NaCl - 80mL of 40% glucose - 20mL of 1M Tris-HCl (pH 8.5) = 250 mL must be completed with water.

Thus, to make the solution you need: <em>50mL of 4M NaCl, 80mL of 40% glucose, 20mL of 1M Tris-HCl (pH 8.5) and 250mL of water.</em>

<em></em>

I hope it helps!

8 0
3 years ago
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