Is an isotope more or less stable the longer the half life?

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Answer 1

Answer: Answer Can someone here please look at my questions and see if you can help

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Which is a product of a condensation reaction? 1. O2 2. CO2 3. H2 4. H2O
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How many grams of iron metal do you expect to be produced when 265 grams of an 84.5 percent by mass iron (II) nitrate solution react with excess aluminum metal? Show all of the work needed to solve this problem. 2Al (s) + 3Fe(NO3)2 (aq) yields 3Fe (s) + 2Al(NO3)3 (aq)
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Which two ions have the same electron configuration?A) Na+ and O2- B) Li+ and F- C) Ca2+ and Br- D) Na+ and O3-

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Answer: A) Na+ and O2-

Explanation:

To know the electronic configuration, one has to determine the numbers of electrons present in each atom.

Na+ means a sodium atom that has lost one valence electron. A Sodium atom initially has 11 electrons, but having lost an electron making it 10 electrons remaining with electron configuration of 1s2 2s2 2p6.

O2- means oxygen atom that has gained two valence electrons. An oxygen atom initially has 8 electrons, having gained two electrons makes it 10 electrons with electron configuration of 1s2 2s2 2p6. same as Na+

The purpose of gaining or losing electrons is to attain a stable duplet or octet structure.

The two ions with same electronic configuration are Na $^+$ and O² $^-$ .

What is electronic configuration?

Electronic configuration is defined as the distribution of electrons of an atom or a molecule in orbitals of an atom or of a molecule.It describes each electron which is moving independently in it's orbital.

Electrons are able to move from one configuration to another by either absorption or emission of a quantum of energy, which is called as a photon.It is useful in understanding the structure of periodic table.

Considering the pair of sodium cation and oxygen anion the sodium atom with one positive charge has 10 electrons and oxygen anion with two negative charge has 10 electrons .

The elements with same number of electrons are called isoelectronic species.

Learn more about electronic configuration,here:

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Explain how human activities are changing the environment globally with serious consequences

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If the world keeps going on how it going all of the polar ice caps will melt leading to a world wide flood.

To ensure accurate recall of the experimental data, at minimum one should

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To ensure accurate recall of the experimental data, at minimum one should keep a record of the data of all the experiments done. Also, the date when it is recorded is important so as to support that the data is real and not only made up.

Answer:

record the data in writing

Explanation:

An ionic solid is placed in a beaker of water. Which of the following occurs when there is a strong attraction between the solute and the solvent?A. The solute melts.
B. The solute dissolves.
C. The solute remains intact.
D. The solute reacts to form a precipitate.

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Answer: Option (B) is the correct answer.

Explanation:

An ionic solid is a substance which has ionic bonds, that is, formed by the transfer of electrons.

Ionic bonds have strong force of attraction because ionic solids have opposite charges which strongly attract each other.

When we dissolve ionic solid in a beaker of water, it completely dissociate into its ions because polar molecules or solutes dissolve in polar solvents.

For example, when NaCl is dissociated into ions then the reaction is as follows.

$NaCl \rightarrow Na^(+) + Cl^(-)$

Thus, we can conclude that when an ionic solid is placed in a beaker of water then the solute dissolves in it.

The answer is B. the solute dissolves. The ionic solid has attraction between ions and when there is strong attraction between solute and solvent, the ion will separate and dissolve in water.

1. Eleanor weights 300 N. She walks up a small hill which is 5 meters high. It takes her 4 seconds. How much work did Eleanor do when she climbed the hill? (3 points)Hint: What is the equation used to calculate work? Does time affect the amount of work completed?

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The equation is Work equals the force times the distance in the direction of the force. This is 300 N * 5 m = 1500 J.

The time does not affect the amount of work.

Based on relative bond strengths, classify these reactions as endothermic or exothermic.

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The adhesion of two materials can form a component when uniting.

Exothermic Reactions are those that release energy and thus heat. These are given in the oxidation reactions which, by being very intense, produce fire.
Endothermic Reactions are those that require heat energy to be produced. The most common reactions are those that transform matter from liquid to gas or solid to liquid.

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