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Lana71 [14]
2 years ago
11

13) Calculate and Round to the correct number of significant digits. *

Chemistry
1 answer:
Lesechka [4]2 years ago
7 0

Answer:

333(3significants points)

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A sample of Francium-212 will decay to one sixteenth of its original amount after 80 minutes. What is the half-life of Francium-
lbvjy [14]

20 minutes.

The sample would lose one half the quantity of francium in each half-life.

1/16 = 1/2^{4} = 1/2 \times1/2 \times1/2 \times1/2

Thus a mass decrease by a factor of 16 would correspond to a period of four half-lives. It took 80 minutes for the sample to lose all these francium, therefore

t_{1/2} = 80/4 = 20 minutes.

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Three isotopes of oxygen are oxygen-16 oxygen-17 and oxygen-18. Write the symbol for each, including the atomic number and mass
notsponge [240]
<span>The notation of the isotopes using the atomic number and the mass number consists of the symbol of the atom, preceded by the mass number as a superscript and the atomic number as a superscript.

All the isotopes of the same element have the same atomic number. They only vary the mass number.

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The isotope oxygen-17 has mass number 17, so it is written with the symbol O preceded by the number 17 as a superscript and the number 8 as a subscript.

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WHAT EQUATION REPRESENTS A SINGLE REPLACEMENT REACTION
mart [117]
A single replacement reaction can be represented by the equation AB + C = AC + B
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Without doing any calculations, arrange the elements in CF2Cl2 in order of decreasing mass percent composition. Rank from highes
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