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tester [92]
3 years ago
6

Complete the nuclear reaction.*

Chemistry
1 answer:
irina [24]3 years ago
5 0

\boxed {_{-1}^0e}

Explanation:

\huge _{53}^{125}I\rightarrow _{54}^{125}Xe+\boxed {_{-1}^0e}

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Magnesium has three common isotopes.
sladkih [1.3K]

Answer:

Explanation:

percentage abundance of third isotope = 100 - ( 78.900 + 10.009)

= 11.091 %

Atomic mass

24.1687 x .789 + 25.4830 x .10009 + 24.305 x .11091  

19.069 + 2.5506 + 2.69566

= 24.3153 amu

7 0
3 years ago
All but one of the following is an important component of soil.
Sholpan [36]

Answer: B is the answer i believe.

3 0
3 years ago
Why do atoms form bonds or why do bonds form?
stiv31 [10]

Answer:

Atoms form chemical bonds to achieve a full outer energy level, which is the most stable arrangement of electrons. A chemical bond is a force of attraction between atoms or ions

Explanation:

7 0
3 years ago
One beaker contains 19.93 mL, another contains 14.0 mL and a third contains 10.6 mL. What is the total volume of the three beake
Juli2301 [7.4K]

Answer:

\large \boxed{\text{44.5 mL}}

Explanation:

When adding or subtracting values, you must round your answer to the same "place" as the measurement with its last significant figure furthest to the left.  

That is, you round off to the same number of decimal places as the measurement with the fewest decimal places.

\begin{array}{r|r}19.9& \text{3 mL}\\14.0&\text{mL}\\10.6&\text{mL} \\\mathbf{44.5} &\textbf{3 mL}\\\end{array}

The measurements of 14.0 and 10.6 have one digit after the decimal point, so you round the sum to have only one digit to the right of the decimal.

The number to be dropped (3) is less than 5, so you drop it.

\text{The total volume of the three beakers is $\large \boxed{\textbf{44.5 mL}}$}

8 0
3 years ago
The half life of Po-218 is three minutes. How much of a 200 atom sample will remain after 15 minutes
MakcuM [25]
<h3>Answer:</h3>

6.25 atoms

<h3>Explanation:</h3>

<u>We are given</u>;

  • The half life of Po-218 is 3 minutes
  • Initial sample is 200 atom
  • Time of decay is 15 minutes

We are required to calculate the remaining mass after decay;

Half life refers to the time taken for original amount of a radioactive sample to decay to a half.

To calculate the remaining mass we use the formula;

N = N₀ × 0.5^n where n is the number of half lives, N is the new amount and N₀ is the original amount.

n = 15 min ÷ 3 min

  = 5

Therefore;

New amount = 200 atom × 0.5^5

                      = 6.25 atoms

Therefore; the amount of the sample that will remain after 15 minutes is 6.25 atoms.

6 0
3 years ago
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