Iron is the most
abundant metal
found on Earth
A. First
B. Second
C. Third
D. Fourth

Water and carbon dioxide are byproducts. Notice that photosynthesis and respiration are essentially the opposite of one another. Photosynthesis removes CO2 from the atmosphere and replaces it with O2. Respiration takes O2 from the atmosphere and replaces it with CO2.

The solubility product (Ksp) of the salt given in question is 1.6x10^-9.

What is solubility product?

The equilibrium constant for a solid material dissolving in an aqueous solution is the solubility product constant, Ksp. It stands for the degree of solute dissolution in solution. A substance's Ksp value increases with how soluble it is.

Suppose we have reaction:

aA(s)↽⇀cC(aq)+dD(aq)

So, the formula to determine solubility product will be:

\(K_{sp} = [C]^c[D]^d\)

Let S mol/L be the solubility of salt. So,

\(S = [BaSo_4] = [Ba^{2+}] = [So_4^{2-}]\)

\(S = 4.0\times10^{-5}\)

we know that,

\(K_{sp} = [C]^c[D]^d = S\times S\)

\(K_sp = (4.0\times10^{-5}) \times (4.0\times10^{-5})\)

\(K_sp = 1.6 \times 10^{-9}\)

Hence, the solubility product is \(1.6 \times 10^{-9}\).

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The chemical equation that depicts a balanced chemical reaction is the one in choice B.

In this choice, the same number of atoms of each elements is in both, reactants and products sides, which means that the law of conservation of mass is fulfilled.

The correct answer is choice B.

The empirical formula is the simplest formula of a chemical compound.

To find the empirical formula, we take the following steps;

1) O - 88.10/16,      H - 11.190/1

  O - 5.5,               H - 11.19

  O - 5.5/5.5,        H - 11.19/5.5

  O -  1,                 H - 2

Empirical formula = OH2

2) C - 41.368/12  H - 8.101/1,   N - 32.162/14,   O - 18.369/16

   C - 3,               H - 8,           N - 2,                  O - 1

   C - 3/1,            H - 8/1          N - 2/1                 O - 1/1

    C - 3,             H - 8,           N - 2,                   O - 1

Empirical formula = C3H8N2O

To obtain the molecular formula where n = number of atoms of each element;

Molecular weight = 174.204 g/mol

[ 3(12) + 8(1) + 2(14) + 16]n = 174

n= 174/88

n = 2 (to the nearest whole number)

Hence, we have;

[C3H8N2O]2

The molecular formula is C6H16N4O2

3)  C - 19.999/12,  H - 6.713/1,   N - 46.646/14,   O - 26.641/16

    C - 2,                H - 7,            N -  3,                 O - 2

    C - 2/2,            H - 7/2,         N -   3/2,             O - 2/2

    C - 1,                H - 4,            N -  2,                  O - 1

Empirical formula - CH4N2O

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Answer:

Island arcs hot spot.

Explanation:

las cadenas de islas volcánicas son conocidas como Cinturón de Fuego del Pacífico

esperó que te sirva marcarme como mejor respuesta

Answer:

Explanation:

They provide structure for the body, take in nutrients from food, convert those nutrients into energy, and carry out specialized functions. Cells also contain the body's hereditary material and can make copies of themselves. Cells have many parts, each with a different function.

Answer:

The correct answer is = 31.04

Explanation:

The relation between volume, temperature and pressure of a fix amount of a gas can be expressed by the combined gas law:

PV/T = k

It can be written as well as

P1V1/T1 = P2V2/T2

Given:

V1 = 217.6

P1 = 9.011 atm

T1 = 127.8°C = 400.95 K

P2 = 44.9

T2 = 11.9 °C = 285.05

Solution:

Putting value in the formula

V2 = P1V1T2/P2T1

= (217.6*285.05*9.011)/44.9*400.95

V2 = 31.04

Explanation:

Percentage composition of oxygen = (80/134) * 100% = 59.7%.

Product prediction and solubility rules in the following chemical reactions

MgBr2 (aq) + Cl2 (g) → MgCl2 (aq) + Br2 (aq)

Reaction type: Substitution

2 Al (s) + Fe2O3 (s) → Al2O3 (s) + 2 Fe (s)

Reaction type: Redox

ZnCl2 + 2 AgNO3 → Zn(NO3)2 + 2 AgCl

Reaction type: Double substitution

H2SO4 (aq) + 2 NaOH (aq) → Na2SO4 (aq) + 2 H2O (l)

Reaction type: Neutralization

4 Al (s) + 3 O2 (g) → 2 Al2O3 (s)

Reaction type: Oxidation

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Answer:

So one mole of Fe2O3 contains two moles of Fe3+ ions.

Explanation:

As there is an internal mole ratio of 2:3

It means that there are 2moles of iron within every mole of iron(III) oxide.

Iron III oxide is an ionic compound composed of Fe3+ ions and O2- ions. According to the formula, there are three O2- ions for every two Fe3+ ions.

Extra:

One 'unit' of Fe2O3 has two Fe3+ ions and three O2- ions, hence a dozen Fe2O3 contains two dozen Fe3+ ions and three dozen O2- ions, and a mole Fe2O3 contains two moles Fe3+ ions and three moles O2- ions.

Answer:

4.214 × 10^23 molecules.

Explanation:

Number of molecules in a substance can be calculated by multiplying the number of moles in that substance by Avagadro's number, which is 6.02 × 10^23.

That is, no. of molecule = n × Avagadro constant

In this case, there are 0.7 moles of fructose. Hence;

number of molecules = 0.7 × 6.02 × 10^23

no. of molecule = 4.214 × 10^23 molecules.

The phenomenon known as "positive selection" occurs under conditions where a strong selection pressure acts on a particular change in an amino acid.

Positive selection is a process that leads to the fixation of a beneficial mutation in a population, and it is often associated with adaptations to new environmental conditions or host-pathogen interactions.

Positive selection can be detected by comparing the rates of non-synonymous (amino acid-changing) and synonymous (silent) substitutions in protein-coding genes, and it has important implications for understanding the evolution of molecular pathways and the emergence of novel functions.

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Answer:

Mass number

Nucleus

Explanation:

The combined number of protons and neutrons is the mass number in atomic notation.

The atomic number is just the number of protons alone.

The nucleus holds both neutrons and protons.

Electrons circle around the nucleus.

Answer: atomic mass I did it

Explanation:

In 1974, the 1973-launched Mariner 10 spacecraft made history by flying by Mercury for the first time.

A vehicle made specifically for space travel is a spaceship. It can encompass both spacecraft made for study, observation, and the deployment of satellites and other payloads as well as those made for human exploration, communication, and transportation. They typically consist of a propulsion system, navigation system, communications system, and numerous payloads, among other things. Typically, a spacecraft needs a launch vehicle to get off the ground and a re-entry mechanism to land safely.

It recorded temperature readings, snapped pictures, and gathered data on the planet's atmosphere during its flyby. Then, radio waves were used to transmit all of this data back to Earth. The mission was a great success and revealed a tonne of fresh Mercury-related data.

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The complete question is,

passed past Mercury in 1974, taking pictures, measuring temperatures, and gathering data on the atmosphere before radio-transmitting the data back to Earth.

To calculate δg∘′ for the oxidation of ethanol by alcohol dehydrogenase, we need to first find the e∘′ value for the reaction. According to the table of e∘′ values, the e∘′ value for the oxidation of ethanol to acetaldehyde is -0.197 V. The δg∘′ for the oxidation of ethanol by alcohol dehydrogenase is 37,831 J/mol.

Next, we use the formula δg∘′ = -nF e∘′, where n is the number of electrons transferred, F is Faraday's constant, and e∘′ is the standard cell potential. In this case, two electrons are transferred in the reaction, so n = 2.
Using a value of 96,485 C/mol for Faraday's constant, we can calculate δg∘′ as follows:
δg∘′ = -2 × 96,485 C/mol × -0.197 V
δg∘′ = 37,831 J/mol

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Answer:

Pretty sure that’s correct

Explanation:

Answer: The answer is:

              The grass population will increase.

Explanation:  Didn't see anything that could be correct, so I chose this on the K12 test and it was correct.

The triathlete needs approximately 1580-1650 calories from fat each day. This calculation is based on a total daily calorie requirement of 4500 calories and a fat intake of 25% of total calories. Option D is Correct.

To calculate the calories needed from fat, we first need to determine the percentage of calories that should come from fat. The American Dietetic Association suggests that athletes' diets should consist of 20-35% fat.

Let's assume a moderate fat intake of 25% for our calculation.

Step 1: Calculate the total calories from fat:

Total Calories = 4500 calories/day

Percentage of Calories from Fat = 25%

Calories from Fat = Total Calories x Percentage of Calories from Fat

Calories from Fat = 4500 calories/day x 0.25

Calories from Fat = 1125 calories/day

Step 2: Convert calories to grams of fat:

Since 1 gram of fat contains 9 calories, we can calculate the grams of fat needed by dividing the calories from fat by 9:

Grams of Fat = Calories from Fat / 9

Grams of Fat = 1125 calories / 9

Grams of Fat ≈ 125 grams

The triathlete needs approximately 1580-1650 calories from fat each day. Remember that individual nutritional needs may vary, and it's always recommended to consult a healthcare professional or registered dietitian for personalized advice. Option D is Correct.

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Answer:

File down there

Explanation:

Answer:

flammable

that's the first thing that popped in my head

Another term for the ability to burn is combustibility. Combustibility refers to the ability of a substance to ignite and burn in the presence of oxygen.

Combustibility is a property that varies among different materials.When a substance is combustible, it means that it can undergo a chemical reaction called combustion, which involves the combination of the substance with oxygen to produce heat, light, and often smoke or flame. Combustion is a rapid oxidation process that releases energy in the form of heat and light.

Examples of combustible materials include wood, paper, gasoline, and natural gas. These substances have the ability to burn when exposed to a spark, flame, or heat source.

It is important to note that not all materials are combustible. Some materials, such as metals, may be non-combustible and do not easily catch fire.

It also allows us to take appropriate precautions when handling and storing combustible substances to prevent accidents and fires.

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0.15 grams of paint chip contains 0.0394 grams of lead.

Since we working with percentages, let's assume that we start out with 100 grams of paint.

Then, we have 14.5 grams of PbCr2O7, lead (II) dichromate, and 73 grams of the paint evaporates,

leaving us with 27 grams of dried paint, from which we extract our 0.15-gram chip.

The molecular mass of PbCr2O7 is 423.2 grams, and the atomic mass of lead is 207.2 grams, so

18.5 grams of PbCr2O7 contains 207.2 * 14.5 / 423.2  =  7.099 grams of lead.

If a 26.4-gram "chip" of paint contains 7.099 grams of lead, then a 0.15-gram chip should contain

0.15*7.099 / 27  =  0.0394 grams of lead.

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Answer:

(CH3COO)2 + redP + Cl2 → ClCH2COOH + HCl

Explanation:

This is an example of halogenation of carboxylic acids at alpha carbon atom. In this reaction, red phosphorus and chlorine are treated with carboxylic acids having alpha hydrogen atom followed by hydrolysis to form alpha chloro carboxylic acid.

Answer:

Protons and Neutrons

Explanation:

Thats it

Answer:

Ankara is the capital of Turkey! Hope this helped you out! :)

Explanation:

The capital of Turkey is Ankara

hopefully this helped :3

Answer:

Geothermal energy

Explanation:

Hope that helps !!!

The chlorine usually forms a Chloride ion.

The Chlorine gains an electron leaving it 17 protons and 18 electrons. Since it has 1 more electron than protons, chlorine has a charge of −1, making it a negative ion. When ions form, atoms gain or lose electrons until their outer energy level is full.

What do you mean by Chlorine forming an ion?

Chlorine has one electron when it forms an ion to be an anion with a charge of -1. The charge of an ion, and thus the number of electrons the atom will gain or lose. If an atom has less than four valence electrons, it will lose them to become a cation.

The chloride ion is the anion  Cl− which is formed facilitating important chemical reactions coupled with its usage in the everyday world.

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Answer:

Nothing. I guess ice vapor is a solid and water vapor is a liquid if nothing isn't an option, but that makes no sense.

Explanation:

Answer:

d

Explanation:

Answer:

D

Explanation:

Because it is l o l

The best design for this experiment is to number the items from 1 to 1,200 and then choose random numbers in the table of random digits (second option).

These tables are used to randomly assign items or subjects into groups when experimenting. The best way to use these tables are:

Based on this, for this experiment the steps are:

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Answer:

b. Number each item from 1 to 1,200. Reading from left to right from a table of random digits, identify 800 unique numbers from 1 to 1,200. Assign the items with labels in the first 400 numbers to the process 1 group. Assign the items with labels in the second 400 numbers to the process 2 group. Assign the remaining items to the process 3 group.

Explanation:

Statistics A edg. 2023