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marin [14]
3 years ago
15

Scandium 15. Write the nuclear symbol for an ion with a charge of +2,20 protons, and 24

Chemistry
1 answer:
Hoochie [10]3 years ago
8 0
If the element has a charge of +2 it has lost two electrons giving it an overall positive charge making it a cation. In order to find the number of electrons, take the elements atomic number and subtract two since it lost two electrons
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The half-life of potassium-40 is 1.3 billion years. If a rock that formed 2.6 billion years ago originally contained 5 grams of
pochemuha

Answer: 1.25 grams of Potassium-40

Explanation: When the amount of a compound is consumed by half, the time passed is called "the half life". This term is particularly important in nuclear chemistry. Potassium-40 is an isotope of potassium element and it is radioactive. As a result, the consumption time of this radioactive isotope is valuable information since radioactive isotopes are detrimental to health and nature.

For example, in this question, within 1.3 billion years, half amount of the potassium-40 disappears. 2.6 billion years ago, there were 5 grams of potassium-40 and when 1.3 billion years pass, half of the 5 grams of potassium-40 will disappear and there will will be 2.5 grams of potassium-40 left (5 grams of potassium-5 grams of potassium*(1/2)[half amount]=2.5 grams of potassium-40 left). As a result, 2.5 grams of potassium-40 is the amount that is present 1.3 billion years ago (2.6 billion years-1.3 billion years [half-life]=1.3 billion years). There will be 1.3 billion years left until today, so we still have to calculate the amount disappeared in 1.3 billion years. Thus, half of the 2.5 grams must disappear in 1.3 billion years left (2.5 grams - 2.5 grams*(1/2)[half amount]=1.25 grams). Finally, we have 1.25 grams of potassium-40 left since 2.6 billion years ago.

8 0
3 years ago
Convert 50 gr of water into moles and into molecules of H2O.
Alina [70]
Uh I can help you with the converting into moles, 50 grams= 2.775421, sorry if I didn’t help much :/
5 0
2 years ago
__________ is a characteristic of an organism that allows it to survive better in an environment.
Reil [10]
Adaptation is the characteristic of an organism that allows it to survive better in an environment
3 0
3 years ago
What is the basic principle that is used during the during the structures of compounds​
levacccp [35]

Answer:

For petrochemical products, most of the petrochemical products are hydrocarbons and their derivatives natural gas, kerosene, gasoline, etc.

Resonance of molecules is the most stable structure of molecules and most stable structure is its middle form among all the resonance structures. This same phenomenon is used in swings.

Explanation:

nag search po ako XD

6 0
3 years ago
A flexible container at an initial volume of 6.13 L contains 6.51 mol of gas. More gas is then added to the container until it r
aivan3 [116]

Answer:

the final mole of the flexible container = 12.92 moles

Explanation:

Given that :

initial volume of a flexible container = 6.13 L

initial mole of a flexible container = 6.51 mol

final volume of a flexible container = 18.3 L

final mole of a flexible container = ???

Assuming the pressure and temperature of the gas remain constant, calculate the number of moles of gas added to the container.

Therefore,

n= \dfrac{V_2*n_1}{V_1}

n= \dfrac{18.3*6.51}{6.13}

n = 19.43

n=n_1+n_2

19.43 = 6.51 + n₂

n₂ = 19.43 - 6.51

n₂ = 12.92 moles

Thus; the final mole of the flexible container = 12.92 moles

6 0
3 years ago
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