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Serggg [28]
3 years ago
14

Which of the following isotopes is not commonly used for dating objects? a. carbon-14 b. phosphorus-32 c. potassium-40 d. rubidi

um-87
Chemistry
2 answers:
Alekssandra [29.7K]3 years ago
3 0
<span> a. carbon-14 b. phosphorus-32 c. potassium-40 d. rubidium-87
d</span>
Lunna [17]3 years ago
3 0

Answer:

The correct answer is phosphorus-32-32.

Explanation:

Phosphorus-32 is an isotope of phosphorus found in many organic molecules. They are used to detect metabolic pathways of involving bio-molecules. Also used to detect malignant tumors in the body of the living being.

Where as:

Carbon-14 is used for carbon-14 dating also known as radiocarbon dating. this is used to determine age of  old objects.

Potassium-40 id used to determination of age of rocks and minerals. Specially used in potassium argon dating.

Rubidium-87 is an isotope of rubidium element used to  determine age of rocks.

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How many hydrogen atoms are in an acyclic alkane with 13 carbon atoms
pashok25 [27]

Answer:

28

Explanation:

CnH2n+2 is the general molecular forma for a acyclic alkane

3 0
4 years ago
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A gas is confined in a 0.3m diameter cylinder by a piston, on which rests a weight. The mass of the piston is 85 kg. The local a
iris [78.8K]

Explanation:

Force applied on the gas will be as follows.

                   F_{gas} = F_{atm} + (m + M) g

As,   F = pressure × area. Hence, calculate the forces as follows.

                  F_{gas} = pressure × area

                         = 1.4 \times 10^{5} Pa \times \pi \times (\frac{0.3}{2})^{2}

                          = 1.979 \times 10^{4} N

                  F_{atm} = pressure × area

                            = 1.0133 \times 10^{5} \times \pi \times (\frac{0.3}{2})^{2}

                            = 1.432 \times 10^{4} N

      F_{gas} - F_{atm} = 5.47 \times 10^{3} N

Substituting the calculated values into the above formula as follows.

                F_{gas} = F_{atm} + (m + M) g

              F_{gas} - F_{atm} = (m + M) g

              5.47 \times 10^{3} N = (m + 85) \times 9.8    

              5.47 \times 10^{3} N = 9.8m + 833

                               m = 472.76 kg

Thus, we can conclude that the mass is 472.76 kg.  

5 0
4 years ago
Which of the following terms means weak sphere
Shtirlitz [24]

Answer:asthenosphere

Explanation:

7 0
3 years ago
Statement which represents following chemical reaction.
kvasek [131]

Answer:

vh uvyvuf7g8vu8x yo curxtu

Explanation:

gu.

3 0
3 years ago
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Fe(NO3)2 not sure how to get the oxidation numbers of all elements
Shtirlitz [24]
You must remember that oxidation number of hydrogen in acids is always +1, oxidation number of oxygen in oxides & acids is always -2... metals has always oxidation number on plus!

group NO3 comes from HNO3...and oxidation number of whole acid group is always on minus and equal to the amount of hydrogen atoms in this acid... so oxidation number of NO3 = -1

we have 2 NO3 groups so 2*(-1) = -2 and that is the reason why oxidation number of Fe in this formula must be +2... because sum of all elements always gives 0!

Now we could count of oxidation number for nitrogen... we write HNO3 and start counting from right to left:
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so nitrogen must have +5 oxidation number... because sum all in formula must be 0.


4 0
3 years ago
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