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zheka24 [161]
3 years ago
8

George is writing an essay about the role of observation and inference in the development of the atomic theory. He wants to expl

ain why it was more difficult to observe the presence of neutrons in atoms. Which statements should he include in his essay? Choose the two statements that apply. A. While protons or electrons can be influenced by other charged particles, neutrons are not. B. It was difficult to observe that neutrons were different than protons because the two particles respond to charge in the same way. C. It was difficult to observe that neutrons were different than electrons because the two particles respond to charge in the same way. D. Neutrons are held tightly together with protons in the nucleus, so scientists could not observe the behavior of neutrons independently.
Chemistry
1 answer:
Katena32 [7]3 years ago
5 0

Answer:

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I) What could Linda do to find out if there were salts dissolved in the
zhenek [66]

Answer:

she can use crystalization method.

Explanation:

She should boil that liquid on  flame and then cool it down on mederate temprature and check it out rather the crystals formed or not . if crystals are formed then there will be salts.

And if she want topredict the certain salt then she has to perform certain reactions.

6 0
3 years ago
Calculate the atomic mass of X. The three X isotopes have atomic mass and relative abundances of 27.9769 amu (92.2297%), 28.9765
Irina18 [472]
<h3>Answer:  Si   (choice D)</h3>

This is the element Silicon.

=========================================================

Explanation:

First convert each percentage to its decimal form.

For example, 92.2297% converts to 0.922297 after moving the decimal point two spots to the left.

After doing that, multiply those decimal values with their respective atomic mass unit (amu) values.

  • 27.9769 * 0.922297 = 25.8030109393
  • 28.9765 * 0.046832 = 1.357027448
  • 29.9738 * 0.030872 = 0.9253511536

Then we add up the results

25.8030109393 + 1.357027448 + 0.9253511536 = 28.0853895409

That rounds to about 28.085

Then look at the periodic table to see the atomic mass of Cobalt (Co), Aluminum (Al), Nickel (Ni) and Silicon (Si). The mass values listed in the periodic table are weighted averages of all the isotopes. The units for the mass are still in amu.

  • Cobalt = 58.933
  • Aluminum = 26.982
  • Nickel = 58.693
  • Silicon = 28.085

We have a match with silicon, showing that <u>choice D</u> is the final answer.

7 0
1 year ago
Why is it called endogenous process
anyanavicka [17]

Answer:

The Earth is shaped by many geological processes. ... Processes caused by forces from within the Earth are endogenous processes. Exo is a prefix meaning "out", and endo is a prefix meaning "in". Many exogenous (extraterrestrial) forces are caused by other bodies in the Solar System.

7 0
3 years ago
Phosphorus-32 (32P) is an isotope that is commonly used for medical and biological research. Phosphorus-32 has a half-life of 14
Pachacha [2.7K]

The activity of the sample when it was shipped from the manufacturer is 4.54 mCi

<h3>How to determine the number of half-lives that has elapsed </h3>

From the question given above, the following data were obtained:

  • Time (t) = 48 hours
  • Half-life (t½) = 14.28 days = 14.28 × 24 = 342.72 hours
  • Number of half-lives (n) =?

n = t / t½

n = 48 / 342.72

n = 0.14

<h3>How to determine the activity of the sample during shipping </h3>
  • Number of half-lives (n) = 0.14
  • Original activity (N₀) = 5.0 mCi
  • Activity remaining (N) =?

N = N₀ / 2ⁿ

N = 5 / 2^0.14

N = 4.54 mCi

Thus, the activity of the sample during shipping is 4.54 mCi

Learn more about half life:

brainly.com/question/2674699

5 0
2 years ago
BRAINLIEST ANSWER _ A balloon occupies a volume of 0.93 liters at a pressure of 84.5 kPa. When the balloon is allowed to expand
SVEN [57.7K]
V1 = 2.0 L T1 = 25.0 oC = 298 K V2 = V1T2 = (2.0 L)(244 K) = 1.6 L V2 = ? t1(298 K) T2 = –28.9 oC = 244 K
 
5 0
3 years ago
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