Given the balanced equation:F2 energy → F F
Which statement describes what occurs during
this reaction?
(1) Energy is absorbed as a bond is formed.
(2) Energy is absorbed as a bond is broken.
(3) Energy is released as a bond is formed.
(4) Energy is released as a bond is broken.

Answers

Answer 1

Answer:

Answer: The correct option is 2.

Explanation: We are given in the question that Fluorine molecule is dissociating into two Fluorine atoms. Equation for the following is given by:

$F_2+energy\rightarrow F+F$

In a chemical reaction if the energy is written at the reactant side, the energy is being absorbed and if the energy is written at the product side, the energy is being released.

From the given chemical equation, the energy is written at the reactant side, so the energy is being absorbed by the reactants in order to break the bond between $F_2$ molecule to form 2 individual Fluorine atoms.

Hence, the correct option is 2.

Answer 2

Answer: (2) Energy is absorbed as a bond is broken is the correct answer.

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an atom has 2 electrons in the first energy level, 8 electrons in the second energy level, and 1 electron in the third energy level. What is the number of core electrons

Answers

Considering the definition of electronic configuration and valence shell, the number of core electrons is 1, because the valance shell is the third energy level.

The Electronic Configuration of the elements is the arrangement of all electrons of an element in energy levels and sub-levels (orbitals).

There are 7 energy levels, numbered from 1 to 7, and in which electrons are distributed, logically in order according to their energy level. Electrons with less energy will be spinning at level 1.

Each level is divided into sub-levels. These sub-levels into which each level is divided can be up to 4. These 4 sub-levels are called: s, p, d, f.

Aufbau's principle is a principle of atomic physics, which explains how electrons are accommodated in their orbits around the nucleus of the atom.

This principle states that the filling of these orbitals occurs in increasing order of energy, that is, from the orbitals of lower energy to those of higher energy.

The simplest of the sub-levels is 1s. If you fill the 1s you can start filling the 2s. After the 2s sub-level is satisfied, the 2p can begin to fill and so on.

The valence shell is the one where the outermost electrons are found, those electrons that are in the last level. Because it is the outermost shell, it is also the farthest from the atomic nucleus.

The valence shell is one whose electrons are responsible for the chemical properties of an element.

In this case, an atom has 2 electrons in the first energy level, 8 electrons in the second energy level, and 1 electron in the third energy level. So, the number of core electrons is 1, because the valance shell is the third energy level.

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Final answer:

The atom described has 10 core electrons. These are located in the first and second energy levels, which are filled from lowest to highest. The electron in the third energy level is a valence electron.

Explanation:

The question you asked involves understanding the structure of atomic energy levels (or shells). In an atom, electrons fill in the energy levels from lowest to highest. The core electrons are those in the inner energy levels.

In your case, the atom has 2 electrons in the first energy level and 8 in the second energy level, making a total of 10 core electrons. The one electron in the third energy level would be considered a valence electron, not a core electron, because it's located in the outermost energy level of the atom.

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Which is a unique feature of Jupiter? A.
the least dense planet in the solar system

B.
the largest, most massive planet

C.
rotates on an axis tilted entirely sideways

D.
the most distant planet from the sun

Answers

I would say the answer is A, because Jupiter is the least dense planet in the solar system. It is the largest planet in our solar system, but that is not what answer choice says. Jupiter does not rotate on an axis completely sideways, that is Uranus, and is not the most distant planet from the sun.

All of the following statements help to explain why water molecules form hydrogen bonds except:________A- Water is an electronegative molecule.
B- The electrons spend more time around the oxygen atom because oxygen is more electronegative than hydrogen.
C- There is a partial positive charge on each hydrogen atom and two partial negative charges on the oxygen atom in a water molecule.
D- Attractions form between opposite partial charges.

Answers

Answer:- Water is an electronegative molecule.

Explanation:

A molecule cannot be electronegative. Rather the atoms in a molecule may be electronegative. This first statement does not account for the hydrogen bonding in water at all because it is incorrect. However, the other statements in the question sheds more light on the nature of hydrogen bonding in water molecule.

Final answer:

Options B, C, and D are correct explanations for why water molecules form hydrogen bonds.

Explanation:

The correct option that does not help to explain why water molecules form hydrogen bonds is A- Water is an electronegative molecule. Hydrogen bonds form between a hydrogen atom in one water molecule and an electronegative atom, such as oxygen or nitrogen, in another water molecule. This attraction occurs because the electronegative atom pulls the shared electrons closer to itself, creating a partial positive charge on the hydrogen atom. The presence of partial positive and negative charges on the molecule is crucial for hydrogen bond formation. Therefore, options B, C, and D all contribute to explaining why water molecules form hydrogen bonds.

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An original sample of the radioisotope fluorine-21 had a mass of 80.0 milligrams. Only 20.0 milligrams of this original sample remain unchanged after 8.32 seconds. What is the half-life of fluorine-21?(1) 1.04 s (3) 4.16 s
(2) 2.08 s (4) 8.32 s

Answers

Answer: The correct answer is Option 3.

Explanation:

All the radioisotope decay processes follow first order kinetics.

Rate law expression for first order kinetics is given by the equation:

$k=(2.303)/(t)\log(a)/(a-x)$

where,

k = rate constant = ?

t = time taken for decay process = 8.32 seconds

a = initial amount of the reactant = 80 mg

a - x = amount left after decay process = 20 mg

Putting values in above equation, we get:

$k=(2.303)/(8.32sec)\log(80g)/(20)\n\nk=0.166sec^(-1)$

The equation used to calculate half life for first order kinetics:

$t_(1/2)=(0.693)/(k)$

where,

$t_(1/2)$ = half life of the reaction = ?

k = $0.166sec^(-1)$

Putting values in above equation, we get:

$t_(1/2)=(0.693)/(0.166sec^(-1))=4.16sec$

Hence, the correct answer is Option 3.

Answer:

4.16s

Explanation:

N = 20*10⁻³g

N₀ = 80*10⁻³g

t = 8.32

N = N₀e⁻λt

In(N/N₀) = -λt

-λ = 1/t * In(N/N₀)

-λ = 1 / 8.32 * In (20*10⁻³ / 80*10⁻³)

-λ = 0.12 * In(0.25)

-λ = -0.167

λ = 0.167

t½ = 0.693 / λ

t½ = 0.693 / 0.167

t½ = 4.16s

Which equations shows the complete dissociation of a strong base?

Answers

The correct answer is the fourth option. The complete dissociation of a strong base is BOH + h20 -> B+ + OH- + H20 since this is the only base from the choices given. A base is a substance that accepts hydrogen ions.

At standard pressure, a certain compound has a low boiling point and is insoluble in water. At STP, this compound most likely exists as(1) ionic crystals
(2) metallic crystals
(3) nonpolar molecules
(4) polar molecules

Answers

At standard pressure, a certain compound has a low boiling point and is insoluble in water. At STP, this compound most likely exists as nonpolar molecules. Hence, option C is correct.

What are nonpolar molecules?

A molecule in which the individual dipoles cancel each other & result in zero net dipole moment is called a non-polar molecule.

Nonpolar molecules make weak attractions between molecules called van der Waals forces and they are loosely bound with each other.

Therefore, nonpolar molecules can easily go to the atmosphere by breaking those weak bonds and having a boiling point low.

Hence, option C is correct.

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Answer is (3) - nonpolar molecules.

Nonpolar molecules make weak attractions between molecules called van der Waals forces. Hence, they are looesly bound with each other. Therefore, nonpolar molecules can easily go to the atmosphere by breaking those weak bonds. Hence, the boiling point is low.

Since water is a polar solvent, nonpolar molecules do not soluble in water.

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