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geniusboy [140]
2 years ago
8

A radioactive substance has a half-life of 5 million years. What is the age of a rock in which 25% of the original radioactive a

toms remain? You must show your work or explain how you came up with your answer for full credit.
Chemistry
1 answer:
GenaCL600 [577]2 years ago
5 0

Answer:

10 million years

Explanation:

For a sample to decay to 25% of its original amount, 2 half lives must have passed. Since one half life is 5 million years, multiplying this by 2 gives us that 2 half lives is 10 million years.

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When two atoms with different electronegativities are bonded together, a bond dipole exists. These are displayed with an arrow o
____ [38]

Answer:

Dipole, less electronegativity,  higher electronegativity

Explanation:

!!! Incomplete Question

When two atoms with different electronegativities are bonded together, a bond dipole exists.

A bond dipole is a partial charge assigned to bonded atoms due to difference in electron density, difference in electronegativity is a factor to this.

These are displayed with an arrow originating at the atom with the less electronegativity and pointing toward the atom with the higher electronegativity value

6 0
3 years ago
A. Clearly draw the Lewis structure for the PBr4- ion. Show your math where
Nataliya [291]

Answer:

   Br

    |

Br-P-Br

    |

   Br

Explanation:

To calculate the valance electrons, look at the periodic table to find the valance electrons for each atom and add them together. P is in column 5A, so it has 5, Br is in column 7A, so it has 7 (multiply by 4 since there are 4 Br atoms to give 28) and there is a 1- charge, so add one more electron. 5+28+1=34, so there are 34 electrons to place. P would be the central atom, so place it in the middle. Place each Br around the P (as shown above) with a a single line connecting it. Each line represents 2 electrons, so 8 total have been place, leaving 26 remaining. Place 6 electrons around each Br (2 on each of the unbonded sides), which leaves 2 electrons remaining. The remaining pair of unbound electrons will be attached to the P between any two Br atoms. Phosphorus doesn't have to follow the octet rule, so it actually ends up with 10 valance electrons.

4 0
3 years ago
Read 2 more answers
You go to the same school as me BAHAHHAHA
Reptile [31]
Oh my i really hope no one from my school sees my comments
4 0
3 years ago
An organic one of these will usually contain carbon and hydrogen.
Oksanka [162]
The answer will be A
7 0
3 years ago
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Select all of the factors that influence GRAVITATIONAL potential energy (Lesson 3.10):
azamat

Answer:

C) Mass

E) Distance from ground

Explanation:

The factors that influence the gravitational potential energy are mass and distance from the ground or height.

Gravitational potential energy is potential energy of a body in relation to that of another under the influence of gravity.

  Mathematically;

      Gravitational potential energy  = mgh

where m is the mass

           g is the acceleration due to gravity

           h is the height

7 0
3 years ago
Read 2 more answers
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