which of the following correctly represents an ion pair and the ionic compound the ions form
a. Ca2-, F-, CaF2
b.Na+, Cl-, NaCl2
c. Ba2+, O2-, Ba2O2
d. Pb4+, O2-, Pb2O4

Answer:

The answer is 5.3 because when looking at the moles produced from the coefficient from the balanced equation all you have to do is make the 6 on the left equal 8.  IN order to do that you multiply by 1 and 1/3, then do that to the number 4 to get 5.3

Explanation:

Answer:

the nucleus of the atom was centrally located i n the atom and was positively charged

Explanation:t

Answer:

the nucleus of the atom was centrally located in the atom and was positively charged

Explanation:

Electrons orbit outside the nucleus. Option A is incorrect.

Nucleus is positive in charge and is located at the center of the atom. Option B is correct.

The nucleus is positively  charged and that the electrons are negatively charged. Option C is incorrect.

Electrons do affect the properties of atoms. Option D is incorrect.

It has to do with time travel

Final answer:

Quantum physics is a branch of physics focusing on the behavior of matter and energy at atomic and subatomic levels, defining energy, momentum, and other quantities in discrete values. It introduces the wave-particle duality of quantum particles and quantization, where energy is exchanged in fixed quanta.

Explanation:

Introduction to Quantum Physics:

Quantum physics, also known as quantum mechanics, is a fundamental theory in physics that explains the behavior of matter and energy at the atomic and subatomic levels. Unlike classical physics, which adequately describes the motion of macroscopic objects, quantum physics is essential for understanding phenomena that occur at extremely small scales where wave-particle duality and quantization become significant. The quantization aspect of quantum mechanics means that energy, momentum, and other quantities of a system can only take on discrete values.

It's this branch of physics that reveals the dual nature of particles, such as electrons, acting both as particles and as waves. This duality is one of the many counterintuitive aspects of quantum mechanics that do not align with everyday experiences and observations. In the world of quantum mechanics, particles gain or lose energy in fixed amounts called quanta. The field also delves into the strange properties and behaviors of quantum entities, predicting probabilities rather than certainties.

Understanding quantum mechanics is crucial for a variety of applications, including the study of atoms, construction of lasers, and the development of quantum computers. It's a field that continues to challenge our perceptions of reality and pushes the boundaries of what we consider possible in the physical world.

Answer:

89.6 L.

Explanation:

CS₂ + 3O₂ → CO₂ + 2SO₂.

Using cross multiplication:

1.0 mole of CS₂ produces → 2.0 moles of SO₂.

2.0 mole of CS₂ produces → ??? moles of SO₂.

∴ The no. of moles of SO₂ produced = (2.0 mol)(2.0 mol)/(1.0 mol) = 4.0 mol.

∴ 4.0 moles of SO₂ occupy = (4.0)(22.4 L) = 89.6 L.

Answer:

89.6 L.

Explanation:

Answer:

Pb(NO₃)₂ ₍aq₎ + 2 KI ₍aq₎  ------------> PbI₂ ₍s₎ + 2 KNO₃ ₍aq₎

Explanation:

Chemical Equation:

lead(II) nitrate: Pb(NO₃)₂

potassium iodide: KI

lead(II) iodide: PbI₂

Potassium nitrate: KNO₃

Pb(NO₃)₂ ₍aq₎ + KI ₍aq₎  ------------> PbI₂ ₍s₎ + KNO₃ ₍aq₎

Balancing the equation:

For balancing the equation all atoms of the elements on both sides of equation i.e reactants and products are equal.

So balancing the above equation we get:

Pb(NO₃)₂ ₍aq₎ + 2 KI ₍aq₎  ------------> PbI₂ ₍s₎ + 2 KNO₃ ₍aq₎

Answer:

Nitrogen atom

Explanation:

Hence;

Answer:

Two functional groups

Explanation:

We have the carboxylic group and the amine group.

The COOH group to the left is the alkanoic acid/carboxylic acid group..

The NH₂ to the right is the amino functional group.

Answer:

Here's what I get.

Explanation:

An acid is a proton donor; a base is a proton acceptor.

Thus, HF is the acid and H₂O is the base.

The conjugate base is what's left after the acid has given up its proton.

The conjugate acid is what's formed when the base has accepted a proton.

HF/F⁻ make one conjugate acid/base pair, and H₂O/H₃O⁺ are the other conjugate acid/base pair.

[tex]\rm \underbrace{\hbox{HF}}_{\hbox{acid}} + \underbrace{\hbox{H_{2}\rm O}}_{\hbox{base}} \rightleftharpoons \underbrace{\hbox{H_{3}\rm O^{+}}}_{\hbox{conj. acid}} +\underbrace{\hbox{F^{-}}}_{\hbox{conj. base}}[/tex]

Answer:

(2) Fe(s) + S(s) → FeS(s)

Explanation:

(2) Fe(s) + S(s) → FeS(s).

Fe is oxidized to Fe²⁺ in (FeS) (loses 2 electrons). "reducing agent".

S is reduced to S²⁻ in (FeS) (gains 2 electrons). "oxidizing agent".

The first reaction: (1) Ba(NO3)2 + Na2SO4 ==> BaSO4 + 2NaNO3

is replacement reaction.

The third reaction: (3) H3PO4 + 3KOH==> K3PO4 + 3H2O

is acid-base reaction.

The fourth reaction: (4) NH3(g) + HCl(g)==> NH4Cl(s)

is synthesis reaction.

The balanced chemical equation which represents a redox reaction is:[tex]Fe_(_s_)+S_(_s_) \rightarrow FeS_(_s_)[/tex] as it includes an oxidant and a reductant. The correct option is 3.

Redox reactions comprise of two parts a reduced part and an oxidized part, which occur simultaneously . The part which is reduced gain electrons and hence there is a increase in oxidation state of the species.

While, the part which is oxidized looses electrons and hence there is a decrease in oxidation state of the species.During redox reactions, there is no net change in the number of electrons . Electrons which are given off in oxidation are used up in reduction.

The ion or molecule which accepts electrons is called as oxidizing agent while the ion or molecule which donates electrons is called as a reducing agent.The only reaction which is an oxidation-reduction reaction is that of iron and sulfur where iron is oxidized and sulfur is reduced.

Thus, the correct option is 3.

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The molecule C3H6 is classified as a Alkene.

The answer is alkene

Answer:

14.68 moles of He

Explanation:

To do this, just remember Avogadro's Constant or Avogadro's number. This constant tells us how many units ( in this case atoms) there are in a mole of ANY type of substance.

Avogadro's constant is 6.022140857 × 10²³ units per mole.

Now that we know how many atoms there are in 1 mole, we can use this as our conversion factor.

8.84 x 10²⁴ atoms of He →  moles of He

[tex]8.84\times10^{24} atoms of He\times\dfrac{1moleofHe}{6.022140857\times10^{23}atomsofHe}=14.68molesofHe[/tex]

So the answer would be:

14.68 moles of He

Answer:

Alkene

Explanation:

Answer:

1. P₂O₅      → oxidation number of phosphorous is +5 and Oxygen is -2.

2. (SO₄)²⁻ → oxidation number of sulfur is +6 and Oxygen is -2.

3. KClO₃   → oxidation number of Potassium is +1, Chlorine is +5, and Oxygen is -2.

4. NH₄Cl  → oxidation number of Nitrogen is -3, Hydrogen is +1, and Chlorine is -1

5. (NH₄)₂S  → oxidation number of Nitrogen is -3, Hydrogen is +1, and Sulfur is -2

Explanation:

General Rules for assigning oxidation numbers

The oxidation number of a free element is always 0.

The oxidation number of a mono-atomic ion equals the charge of the ion.

The alkali metals (group I) always have an oxidation number of +1.

The alkaline earth metals (group II) are always assigned an oxidation number of +2.

Oxygen almost always has an oxidation number of -2, except in peroxides (H₂O₂) where it is -1 and in compounds with fluorine (OF₂) where it is +2.

Hydrogen has an oxidation number of +1 when combined with non-metals, but it has an oxidation number of -1 when combined with metals.

The algebraic sum of the oxidation numbers of elements in a compound is zero.

The algebraic sum of the oxidation states in an ion is equal to the charge on the ion.

Using the above rules:

1. P₂O₅

∵ it is a neutral compound its total charge is 0.

Also, we know that oxygen has an oxidation number of -2.

Let oxidation number of P be x

∴ 2(x)+5(-2)=0   →   2x=+10   →   x=+5  

∴oxidation number of phosphorous is +5.

2. SO₄²⁻:

∵ it is a charged ion its total charge is -2.

Also, we know that oxygen has an oxidation number of -2.

Let oxidation number of S be x

∴ (x)+4(-2)= -2   →   x=+6  

∴oxidation number of sulfur is +6.

3. KClO₃:

∵ it is a neutral compound its total charge is 0.

Also, we know that oxygen has an oxidation number of -2 and the  oxidation number of K (group I) is +1

Let oxidation number of Cl be x

∴ (+1) + (x) + 3(-2) = 0   →   x=+5  

∴oxidation number of Chlorine is +5.

4. NH₄Cl:

∵ it is a neutral compound its total charge is 0.

Also, we know that chloride has an oxidation number of -1

Hydrogen has an oxidation number of +1 when combined with non-metals

 Let oxidation number of N be x

∴ (x) + 4(+1) + (-1) = 0   →   x=-3  

∴oxidation number of Nitrogen is -3.

5. (NH₄)₂S:

∵ it is a neutral compound its total charge is 0.

Also, we know that chloride has an oxidation number of -1

Ammonium ion (NH₄⁺) has an oxidation number of +1

 Let oxidation number of N be x

∴ 2(+1) + (x) = 0   →   x= -2  

∴oxidation number of sulfur is -2.

Answer: A. fossil

B. rock layer

Explanation:

Relative aging or dating can be define as the technique for determination of the age of the rock and fossil. It is a method of determining the chronological order of the past events by comparing the stratigraphic column of rocks and sediments with each other. This method can only give relative age of one object in comparison with the other but does not give the absolute date.  

Answer:

matter

Explanation:

Iron marks the boundary between fusion and fission for energy release. Lighter elements than iron release energy through fusion, while heavier elements release energy through fission. Iron has the highest binding energy per nucleon, making it a turning point on the energy-mass curve.

The element that marks the boundary between using fusion and fission to release energy is iron (Fe). In the context of nuclear reactions, fusion occurs when two light nuclei combine to form a heavier nucleus, releasing energy because the combined nucleus has a higher binding energy per nucleon.

In contrast, fission is the process of splitting a heavy nucleus into smaller nuclei, releasing energy because the products have a higher binding energy per nucleon than the original heavy nucleus.

Iron possesses the highest binding energy per nucleon, which is why it is an energy-increasing process to fuse nuclei lighter than iron. For elements heavier than iron, fission becomes an energy-releasing process. Thus, iron is a unique marker in the periodic table where the more energy-efficient method of releasing nuclear energy switches from fusion to fission.

Fusion is responsible for powering stars and for the creation of elements in the universe through a process known as nucleosynthesis. Furthermore, while fission has been utilized in nuclear weapons and reactors, fusion promises to release far more energy per reaction, making it an attractive but technically challenging energy source. On an energy-mass curve, nuclei to the left of iron release energy through fusion while those to the right produce energy through fission.

the law of thermodyanamic is the restatement of the law of conservation of energy

Answer:

Cannot form hydrogen bonds to its neighbours.

Explanation:

The strongest intermolecular forces in H₂CO are dipole-dipole attractions between the polar C=O bonds in nearby molecules.

The strongest intermolecular forces in CH₃OH are strong hydrogen bonding attractions between the O-H group in one molecule and the O atom in a nearby molecule.

Since H₂CO molecules have weaker intermolecular forces than methanol, more of them can escape from the liquid to the vapour phase.

Thus, CH₂O has a higher vapour pressure than methanol.

Formaldehyde (H2CO) has a higher vapor pressure than methanol (CH3OH) due to weaker intermolecular forces, as methanol can form stronger hydrogen bonds which formaldehyde cannot, leading to a lower vapor pressure for methanol.

The main reason why H2CO (formaldehyde) has a higher vapor pressure at a given temperature compared to CH3OH (methanol) is because of the different types of intermolecular forces (IMFs) present in each compound. Methanol can form hydrogen bonds due to its -OH group, which are much stronger than the dipole-dipole interactions and London dispersion forces present in formaldehyde.

Despite methanol and formaldehyde having similar molar masses, the stronger hydrogen bonding in methanol means that more energy is needed to escape from the liquid phase, resulting in a lower vapor pressure for methanol compared to formaldehyde.

Answer:

I think D

Explanation:

Q > Ksp,  there are more ions in solution than are necessary for saturation. This is a supersaturated solution (i.e There is a tendency for the extra solute to precipitate).

Answer:

84 Joules are wasted per second.

Explanation:

An efficiency of 16% means 84% is wasted as heat energy.  

Therefore;

For a 100W bulb;

Heat wasted = 84/100 × 100 W

                      = 84 W

Therefore;

84 W or 84 joules are wasted as heat per second

Answer and Explanation:

Answer: C. An increase in food availability increases the birth rate in the population.

Explanation:

The conveying limit of a biological system can be characterized as the greatest size of a populace of an animal types an environment can uphold based on accessibility of assets, for example, food, water, living space and different necessities.

An increase in food availability increases the birth rate in the population

is the right choice in light of the fact that to build the populace till the conveying limit there should be excess stock of food ought to be accessible to the populace which can uphold in expansion in birth rate so the populace can achieve a level at the conveying limit.

Answer:

[Ar] 3d10 4s2 4p4

Explanation:

Answer: The electronic configuration of selenium is [tex][Ar]4s^23d^{10}4p^4[/tex]

Explanation:

Electronic configuration is the representation of electrons that are present in an element.

Selenium is the element which is present in Group 16 and has an atomic number of 34.

Atomic number is defined as the number of protons or number of electrons present in an atom.

The number of electrons present in this element is 34.

So, the electronic configuration of selenium = [tex]Se:[Ar]4s^23d^{10}4p^4[/tex]

Answer:

A. O, S, Se

Explanation:

If you look up Oxygen (O), Sulfur (S) and Selenium (Se) in the periodic table, you will see that these three fall under the same column. In the periodic table, elements are arranged in rows and columns. Columns are called groups. The elements that fall under the same group share similar chemical properties.

The elements given above are all in Group VIA or group 16.

Answer:

Lets the total pressure is Pt and the individual gases are designated as pH2, pCO2, pNe, pO2.

Pt =  pCO2+ pNe+pO2+ pH2

285KPa = 13 KPa+ 14 KPa + 157 KPa +pH2

Now add the partial pressure of CO2, Ne and O2 which is equal to 184 KPa.

285 KPa = 184 KPa + pH2  

Now subtract the individual pressure of each gas from thje total pressure.

285 KPa - 184 KPa = pH2

                101 KPa = pH2

The partial pressure of hydrogen is  101 KPa.

Answer:

2H₂ + O₂ → 2H₂O.

Explanation:

2H₂ + O₂ → 2H₂O.

So, every 2.0 moles of H₂ react with 1.0 mole of O₂ to produce 2.0 moles of H₂O.

The balanced equation of the reaction is:

[tex]\underline{2}H_2\ +\ \underline{1}O_2\ \rightarrow \underline{2}H_2O\\[/tex]

A balanced equation must have equal numbers of moles of the various element on both sides of the equation.

Now, lets us analyze the given equation. This is show below:

[tex]\_H_2\ +\ \_O_2\ \rightarrow \_H_2O\\[/tex]

Reactants:

Products:

From the above, it is obviously clear that the equation is not balanced.

Therefore, the equation can be balanced by writing 2 before hydrogen gas, H₂ and 2 before water, H₂O as shown below:

[tex]\underline{2}H_2\ +\ \underline{1}O_2\ \rightarrow \underline{2}H_2O\\[/tex]

Now, we can say that the equation is balanced.

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nutrition reaction or saline reaction because these reactions generate salts , such as:

HCl + NaOH==>NaCl + H2O

Answer:

[tex]\boxed{\text{(B)}}[/tex]

Explanation:

CaF₂(s) ⇌ Ca²⁺(aq) + F⁻(aq); ΔH > 0

According to Le Châtelier's Principle, when a stress is applied to a system at equilibrium, the system will respond in a way that tends to relieve the stress.

Let's consider each of the stresses in turn.

(A) Evaporating some of the water

The concentrations of the ions will increase, so calcium fluoride will precipitate out to remove the stress (the Ca²⁺ and F⁻ ions). The position of equilibrium does not shift, and [Ca²⁺] stays the same.

(B) Adding HNO₃

HF is a weak acid, so F⁻ is a relatively strong base. The added HNO₃ will convert the F⁻ ions to HF, removing them from solution. More CaF₂ will dissolve to replace the F⁻ ions, and this will add more Ca²⁺ ions as well. The position of equilibrium will shift to the right, and [Ca²⁺] will increase.

(C) Adding NaNO₃(aq)

There is no common ion, so NaNO₃ will have no effect. The added water will dilute the solution and decrease the concentrations of the ions. However, more CaF₂ will dissolve to increase the concentrations. The position of equilibrium does not shift, and [Ca²⁺] stays the same.

(D) Adding NaF

This is the common ion effect. F⁻ is the common ion. The added NaF will dissolve, increasing the concentration of F⁻ ions. More CaF₂ will precipitate to remove the added F⁻ ions, but it removes Ca²⁺ ions at the same time. The position of equilibrium shifts to the left, and [Ca²⁺] decreases.

its c take the pressure away

The study of chemicals and bonds is called chemistry. There are different types of elements and these are metals and nonmetals.

The correct answer is option C which decreases the pressure over the liquid.

The mixing of solute in the solvent is called solubility.

Solubility of solute depends on these factors and these are:-

According to the question, solubility increases when the pressure in liquid decreases.

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Answer:

Its acidic.. With pH=3

Explanation:

pH + pOH =14

Let pH be x then

x + 11 = 14

x = 3

pH less than 7, solution is acidic.

The solution with a pOH of 11 will be acidic in nature.

When the aqueous solution is dissociated based upon the ions released by them it is categorized as acids or bases. When the solution gives out [tex]H^+[/tex] ion it is called as acid, whereas if it gives out [tex]OH^-[/tex] ions it is called as bases.

The concentration of [tex]H^+[/tex] ions is represented by pH, whereas the concentration of [tex]OH^-[/tex] ion is represented by pOH. In pOH scale value seven refers to neutral, whereas value below seven shows that the substance is basic whereas the value above seven indicates the substance as acidic.

Thus, it can be inferred that the solution with a pOH of 11 will be acidic in nature.

The answer is nucleic acids