Consider the following voltaic cell:(c) In which half-cell do electrons enter the cell?

Answer:

C

Explanation:

ostriches are classified as diurnal

Answer: The answer is diurnal!

Explanation: Nocturnal animals, such as the owl or bat, stay awake during the night and sleep during the day! Which for diurnal animals, they sleep during the night, and roam around during the day! Such as us humans are both because some people may work during the night and sleep during the day! The most common for humans is us sleeping at night though and awake during the day!

Based on this picture (weather map) which shows the snowfall during a snowstorm in New England in 1983, this picture illustrates and indicates the: C. weather conditions in New England, because it shows the precipitation over a few days

In Geography, a weather map can be defined as a type of chart (publication) that is typically used to provide information about the average atmospheric condition of a geographical region over a short period of time.

In Geography, weather can be defined as the average atmospheric conditions of a geographical region (area) over a short period of time. Additionally, there are various elements of weather and these include the following:

By critically observing the given weather map, we can reasonably infer and logically deduce that it represents the average atmospheric conditions of New England because it shows the amount of precipitation over a few days, which is from the 10th of February to 12th of February, 1983.

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Complete Question:

The picture below shows the snowfall during a snowstorm in New England in 1983. What does this picture show?

Answer: its D ! The arrows to the right of Earth should point up.

Explanation:

i took quiz

Answer:

its D i think

Explanation:

Answer:

1. LiCi is formed by the treatment of lithium carbonate with hydrochloric acid

2. A combination reaction (also known as a synthesis reaction) is a reaction where two or more elements or compounds (reactants) combine to form a single compound (product).  

3. Chemical decomposition, or chemical breakdown, is the process or effect of simplifying a single chemical entity into two or more fragments.

4. A single-displacement reaction, also known as single replacement reaction or exchange reaction, is a chemical reaction in which one element is replaced by another in a compound

5. Double replacement reactions have two ionic compounds that are exchanging anions or cations.

6. The most electronegative elements are found on the top right of the periodic table.

7. cesium

8. Electronegativity describes the degree to which an atom attracts electrons in a chemical bond. But the electronegativity of two atoms would determine their bond type.

9. ionic bond

10. polar covalent bond

11. fluorine

12. Matter can change form through physical and chemical changes, but through any of these changes, matter is conserved. The same amount of matter exists before and after the change.

Hope i was able to help!!!

Answer:

0.47094837228 moles

Explanation:

silver nitrate=169.87g per mol

80/169.87 = 0.47094837228

Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 0.47moles of silver nitrate are there in 80.00 grams of silver nitrate.

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.

Mathematically,

number of moles of substance =given mass of substance ÷ molar mass of substance

Molar mass of 1 mole of silver nitrate=169.87g/mol

mass of silver nitrate= 80g

Substituting all the given values in the above equation, we get

number of moles of silver nitrate=80 ÷169.87

                                                        =0.47moles

Therefore, 0.47moles  of silver nitrate are there in 80.00 grams of silver nitrate.

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Diamagnetic ions are  II, III only.

Diamagnetic materials are repelled by way of a magnetic area; an implemented magnetic area creates a caused magnetic field in them in the opposite direction, causing a repulsive pressure. In comparison, paramagnetic and ferromagnetic materials are attracted with the aid of a magnetic subject.

Paramagnetic materials in general align with and improve an outside magnetic field, whilst diamagnetic substances in part expel an applied subject and constantly align themselves in order that they may be perpendicular to its lines of magnetic pressure.

Diamagnetic materials are people that a few humans usually think about as non-magnetic, and consist of water, wood, maximum natural compounds which include petroleum and some plastics, and many metals consisting of copper, especially the heavy ones with many center electrons, such as mercury, gold, and bismuth.

Both Zn²⁺ and Cu⁺ have the same valence electron configuration:

[Ar]3d10

Now, we can see that the d shell is totally full. In another word, all 10 d electrons are paired (in five pairs, each pair is filled into one d orbital).

Thus, both of them are diamagnetic.

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The amount of a radioactive sample remaining after any given time can be calculated using the equation A=A0*(1/2)^n, where A is the amount remaining, A0 is the initial amount, and n is the number of half-lives passed.

In this case, A0 = 128 g, n = 5.6 (140 days / 25 days = 5.6).

A = 128 * (1/2)^5.6 = 2.0 g

What is radioactive?

Radioactive is a term used to describe certain elements that emit radiation, typically alpha and beta particles or gamma rays. These elements are unstable and have excess energy, which they release in the form of radiation to become more stable. Radioactive elements have a variety of uses, such as in medical imaging, smoke detectors, and the production of nuclear energy. Radioactivity is also used in carbon dating and to date geological samples. Radioactive elements can be found in nature, but can also be created artificially in nuclear reactors or particle accelerators. These materials can be dangerous if not handled properly, and long-term exposure to radiation can have serious health consequences.

Therefore, option B is correct.

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The energy is found to has a specific physical meaning. There are different forms of energy on earth. The ability to do the work is defined as the energy. Here chemical energy is not used by the car. The correct option is A.

The measure of the work an object can do by virtue of its motion is defined as the kinetic energy. To accelerate an object, it is very important to have the kinetic energy. Activities like walking, jumping, and falling involve kinetic energy.

The energy which is stored in the molecules and atoms and is converted to other forms of energy is defined as the chemical energy. The fuel and air are chemical energy which is transformed to mechanical for a race car. Here kinetic energy inside the engine is transformed from chemical energy to mechanical energy.

So electrical energy, kinetic energy and sound energy are used by cars.

Thus the correct option is A.

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Answer:

This question is incomplete

Explanation:

This question is incomplete but one can assume the answer from the definition of quantum mechanics. Quantum mechanics is the science that describes particles in nature at the atomic and subatomic particle (electron, proton and neutron) level. Thus it can be assumed that atoms and subatomic particles are used to broadly describe particles.

Answer:

Force to do a certain task over distance creates work. Work can increase energy, therefore energy does work, and distance is a kind of work. This is all I got

Explanation:

Answer:

oxygen

Explanation:

combustion esterfication

The given cell notation represents a redox reaction where barium (Ba) is oxidized at the anode, releasing electrons, while copper (Cu) is reduced at the cathode, gaining electrons.

The cell notation ba(s) ∣ ba2 (aq) ‖ cu2 (aq) ∣ cu(s) represents a galvanic cell with two half-cells separated by a salt bridge. In the anode compartment (left side), solid barium (Ba) is oxidized to barium ions (Ba2+). This can be represented by the half-reaction:

Ba(s) → Ba2+(aq) + 2e^-

At the cathode compartment (right side), copper ions (Cu2+) are reduced to solid copper (Cu) by gaining electrons. This can be represented by the half-reaction:

Cu2+(aq) + 2e^- → Cu(s)

Overall, the redox reaction can be obtained by combining the two half-reactions:

Ba(s) + \(Cu_2+(aq)\) → \(Ba_2+(aq)\) + Cu(s)

In this reaction, barium is oxidized (loses electrons) and copper is reduced (gains electrons), making it a redox reaction. The electrons released by barium at the anode flow through the external circuit to the cathode, where they are consumed in the reduction of copper ions. This flow of electrons generates an electric current in the cell.

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Answer:

the temp of nitrogen is the answer

The functional groups present in dioxin, diphenyl, and thyroid are as follows: Dioxin (specifically referring to 2,3,7,8-tetrachlorodibenzo-p-dioxin):

Dibenzo-p-dioxin structure: This consists of two benzene rings fused with a central oxygen atom.

Chlorine substituents: Four chlorine atoms are attached to the benzene rings.

Diphenyl:

Phenyl group: It is a benzene ring (phenyl ring) with a hydrogen atom removed.

Two phenyl groups: Diphenyl refers to two phenyl groups connected.

Thyroid:

Thyroxine structure: Thyroxine is a hormone produced by the thyroid gland. It contains various functional groups such as:

Iodine: Thyroxine contains iodine atoms attached to the aromatic rings.

Amine group: It contains an amino group (-NH2) present in the side chain.

Carboxyl group: It contains a carboxyl group (-COOH) in the side chain.

These functional groups contribute to the chemical properties and biological activities of these compounds.

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Answer:

 A FLUORINE

Explanation:

Explanation:

Option A, Fluorine is the correct answer, because it has 9 electrons in its shells.

hope this helps you.

The volume of the solution of NaOH required is obtained as 400 mL.

The term titration has to do with the procedure by which an acid reacts with a base to give salt and water only. The process of titration is a volumetric process.

We can see that the reaction shows that  2 moles NaOH reacts with 1 mole of the acid.

Number of moles of  acid= 2.0 mol/L x 0.1 L = 0.2 moles

Number of moles of base required = 2 x 0.2 = 0.4 moles

Number of moles of NaOH that we need = (x L)(1.0 mol/L) = 0.4 moles

Volume of NaOH that we need =  0.4 L or 400 mL

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Missing parts;

How many ml of 1.0 M NaOH solution are needed to neutralize 100 ml of 2.0 M H2SO4 solution

The compound that will readily react with a solution of bromine consisting of 48% hydrobromic acid and 30% hydrogen peroxide is acetic acid.Hydrobromic acid is a solution of hydrogen bromide (HBr) in water.

It is a strong acid that can be used for several industrial purposes. Hydrogen peroxide is a reactive chemical with the chemical formula H2O2. When combined with hydrobromic acid, hydrogen peroxide forms a solution known as hydrobromic acid. Bromine is a non-metallic element that reacts with many compounds to form new substances.Acetic acid (CH3COOH) is a weak organic acid that is commonly found in vinegar and is used in the production of cellulose acetate.

When acetic acid is mixed with a solution of bromine containing 48% hydrobromic acid and 30% hydrogen peroxide, it reacts readily. This reaction will produce a new compound.The other three options (cyclohexane, dichloromethane, t-butyl alcohol, and cyclohexene) do not have any active functional groups such as an alcohol, carboxylic acid, or an unsaturated bond that can undergo halogenation or oxidation reactions. Therefore, they will not react with a solution of bromine consisting of 48% hydrobromic acid and 30% hydrogen peroxide.

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The substance that contains the greatest amount (in moles) of carbon atoms per mole of compound is benzoyl peroxide (\(C_1_4H_1_0O_4).\)

Option D is correct

We analyze each substance by:

A. Aspirin (C9H8O4)

Molar mass of carbon (C) = 12.01 g/mol

Number of moles of carbon atoms in aspirin = 9

Caffeine (C8H10N4O2)

Molar mass of carbon (C) = 12.01 g/mol

Number of moles of carbon atoms in caffeine = 8

Saccharin (C7H5NO3S)

Molar mass of carbon (C) = 12.01 g/mol

Number of moles of carbon atoms in saccharin = 7

. Benzoyl peroxide (C14H10O4)

Molar mass of carbon (C) = 12.01 g/mol

Number of moles of carbon atoms in benzoyl peroxide = 14

Carbon tetrachloride (CCl4)

Molar mass of carbon (C) = 12.01 g/mol

Number of moles of carbon atoms in carbon tetrachloride = 1

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Answer:

hydrogen bonds are very weak and can only occur when polar covalent bonds are present

Explanation:

Hydrogen bonds are weak intermolecular interactions that occur when hydrogen is covalently bonded to a highly electronegative atom.

Owing to the difference in electro negativity between hydrogen and the highly electronegative atom, the bond is a polar covalent bond.

This hydrogen bond is a weak bond but accounts for properties such as high melting and boiling points of small molecules such as water and ammonia.

The missing parts in the table is given below

An atom is composed of a centrally placed nucleus (containing protons and neutrons) and a cloud of electrons revolving round it.

Mass number (number of nucleon) = Proton + Neutron

Charge = Proton – Electron

i. Determination of the nucleon number

Nucleon number = Proton + Neutron

Nucleon number = 11 + 12

Nucleon number = 12

ii. Determination of the symbol

We'll begin by determining the charge of the particle. This is illustrated below:

Charge = Proton – Electron

Charge = 11 – 10

Charge = +1

From the periodic table, the element with proton number of 11 is sodium, Na. Since the particle B has a charge of +1, the symbol of particle of B is Na⁺

i. Determination of the number of electrons

Charge = Proton – Electron

–2 = 8 – Electron

Collect like terms

–2 – 8 = – Electron

– 10 = – Electron

Electron = 10

ii. Determination of the nucleon number

Nucleon number = Proton + Neutron

Nucleon number = 8 + 8

Nucleon number = 16

i. Determination of the number of protons

Charge = Proton – Electron

3 = Proton – 10

Collect like terms

3 + 10 = Proton

Proton = 13

ii. Determination of the number of neutrons

Nucleon number = Proton + Neutron

28 = 13 + Neutron

Collect like terms

28 – 13 = Neutron

Neutron = 15

Complete question

See attached photo

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Explanation:

well, I dunno if I'm correct but I think it's a physical change cause no new substance is formed

the data from Appendix C in the textbook to calculate the equilibrium constant K, at 298K for each of the following reactions: the equilibrium constant for reaction C) at 298K is 3.55 x 10^-5.

To calculate the equilibrium constant (K) for each of the given reactions at 298K using the data from Appendix C in the textbook, we need to use the following equation:

K = [products]^coefficients / [reactants]^coefficients

Where [ ] represents the concentration of the species, and coefficients are the stoichiometric coefficients of the balanced chemical equation b.

For reaction A) H2(g) + I2(g) <--> 2HI(g), we can use the data from Appendix C to find the standard free energy change (∆G°) and the standard enthalpy change (∆H°) at 298K, which are -16.4 kJ/mol and 25.9 kJ/mol, respectively. We can then use the relationship ∆G° = -RT lnK (where R is the gas constant and T is the temperature in Kelvin) to solve for K:

K = e^(-∆G°/RT) = e^(-(-16.4 kJ/mol) / (8.314 J/mol-K * 298 K)) = 54.3

Therefore, the equilibrium constant for reaction A) at 298K is 54.3.

For reaction B) C2H5OH(g) <--> C2H4(g) + H2O(g), we can similarly use the data from Appendix C to find ∆G° and ∆H° at 298K, which are 46.4 kJ/mol and 44.5 kJ/mol, respectively. Using the same equation as before, we can solve for K:

K = e^(-∆G°/RT) = e^(-46.4 kJ/mol / (8.314 J/mol-K * 298 K)) = 2.29 x 10^-4

Therefore, the equilibrium constant for reaction B) at 298K is 2.29 x 10^-4.

For reaction C) 3C2H2(g) <--> C6H6(g), we can use the data from Appendix C to find ∆G° and ∆H° at 298K, which are -63.9 kJ/mol and 630.1 kJ/mol, respectively. Since the equation is not balanced in terms of moles, we need to divide ∆G° and ∆H° by 3 to get the values for one mole of C2H2. Then, using the same equation as before, we can solve for K:

K = e^(-∆G°/RT) = e^(-(-63.9 kJ/mol/3) / (8.314 J/mol-K * 298 K)) = 3.55 x 10^-5

Therefore, the equilibrium constant for reaction C) at 298K is 3.55 x 10^-5.

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When 50 NBr3 molecules and 57 NaOH formula units react according to the given balanced equation, the result is the formation of 150 NaBr formula units.

According to the balanced equation provided:

2 NBr3 + 3 NaOH -> N2 + 3 NaBr + 3 HOBr

From the equation, we can see that 2 moles of NBr3 react with 3 moles of NaOH to form 3 moles of NaBr.

To determine the number of NaBr formula units formed, we need to convert the given quantities into moles.

Given:

Number of NBr3 molecules = 50

Number of NaOH formula units = 57

To convert the number of NBr3 molecules to moles, we need to divide the given quantity by Avogadro's number. Similarly, for NaOH formula units, we can directly consider them as moles.

Using Avogadro's number (6.022 x 10^23 molecules/mol), we can calculate the number of moles for NBr3 and NaOH:

Number of moles of NBr3 = 50 / (6.022 x 10^23)

Number of moles of NaOH = 57

Now, we can use the mole ratios from the balanced equation to determine the number of moles of NaBr formed. From the equation, we know that 2 moles of NBr3 react to form 3 moles of NaBr.

Number of moles of NaBr = (Number of moles of NBr3) x (3 moles of NaBr / 2 moles of NBr3)

Finally, we can convert the number of moles of NaBr to the number of NaBr formula units using Avogadro's number:

Number of NaBr formula units = (Number of moles of NaBr) x Avogadro's number

Calculating these values, we find that 50 NBr3 molecules and 57 NaOH formula units react to form 150 NaBr formula units.

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There are c. 1.20 x \(10^{24}\) atoms in 2 moles of sodium.

To determine the number of sodium atoms in 2 moles of sodium, we need to use Avogadro's number, which states that one mole of any substance contains 6.02 x \(10^{23}\) particles. Since we have 2 moles of sodium, we can multiply 2 by Avogadro's number to find the total number of sodium atoms. The calculation would be: 2 moles * 6.02 x \(10^{23}\) atoms/mole = 1.20 x \(10^{24}\) atoms.

Therefore, the correct option is c. 1.20 x \(10^{24}\). This represents the approximate number of sodium atoms present in 2 moles of sodium.

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Answer:    

Explanation:      

The nucleus is an organelle found in eukaryotic cells. Inside its fully enclosed nuclear membrane, it contains the majority of the cell's genetic material. This material is organized as DNA molecules, along with a variety of proteins, to form chromosomes.

Answer:

Refer to explanation

Explanation:

Weather is the main cause behind most short term environmental changes

For example, a period of heavy rain may lead to a pond overflowing, and flooding the nearby shrubbery

Animals in the area would adapt to this by trying to keep away from the flooded area until it dries out, once the rain ends

Answer:

Percent error in meter stick measurement is 5.5%.

Explanation:

Given data:

Measured value = 25 cm

Accepted value = 23.7 cm

percent error = ?

Solution:

Subtract the accepted value from measured value divided by accepted value multiply by 100.

Formula:

(measured value - accepted value / accepted value ) × 100

Now we will put the values.

(25 cm - 23.7 cm/23.7 cm ) × 100

1.3 cm/23.7 cm ) × 100

0.055× 100

5.5%

Percent error in meter stick measurement is 5.5%.

Khrushchev installed nuclear missiles in Cuba primarily for reason A) to deter an invasion.

This action was taken during the Cold War, a period of heightened tension between the United States and the Soviet Union. By placing missiles in Cuba, Khrushchev aimed to establish a strategic advantage and deter potential US aggression towards both Cuba and the Soviet Union.

This move was a way of waging the Cold War (C) by showcasing Soviet military power and protecting their ally, Cuba. The Peace Corps (B) and quietly negotiating (D) are not directly related to the installation of missiles in Cuba. The presence of nuclear missiles in Cuba led to the Cuban Missile Crisis, a pivotal moment in Cold War history that brought the world to the brink of a nuclear conflict. Hence, the correct answer is Option A.

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