The pic to the right shows you several organs working together including ur lungs, bronchi and trachea (windpipe) this means this pictures shows you an ?

Answer:

53.29%oxygen

Explanation:

math and stuff

Explanation:

1) from the periodic table for example if u looking for K it is from the group 1A so the valancey = +1 that is mean it loses one electron to reach a stable state. and this applied for the 1A , 2A, 3A groups.

if u looking for N it is from group 5A so its valency is -3

so it gain 3 electrons to reach a stable state to complete its orbital to 8 electrons. this applied to 5A, 6A,7A

for the transition metals and simimetals other rules.

2) neutral if the element does not hold any charge like

H2, O2, N2, Fe, Au, Cu ...

isotope : if the 2 elements have same symbol and atomic number but they differ in the mass number because the have different numbers of neutrons.

if the element is charged then it is considered as an ion ex: Fe2+ then it is iron cation ( +ion)

F- then it is fluoride anion (-ion)

if u have any doubt just writ a comment ( ;

Answer:

0.5133805136 moles.

Explanation:

1 gram of Al2(Co3)3 equals 0.0017112683785004 moles, we need the amount of moles produced in 300 grams of Al2(CO3)3, so we have to multiply 1 gram of Al2(CO3)3 times 300: 0.0017112683785004 x 300, in conclusion,

300 grams of Al2(Co3)3 equals 0.5133805136.

Explanation:

Molar mass of

B

=

10.81

g

⋅

m

o

l

−

1

. If there are 36 odd grams of

B

, there are approx.

7

2

×

N

A

boron atoms, where

N

A

is Avogadro's number.

Explanation:

35.76

⋅

g

10.81

⋅

g

⋅

m

o

l

−

1

×

6.022

×

10

23

m

o

l

−

1

=

?

?

Answer link

MAT

Nov 15, 2015

1.991

×

10

24

Explanation:

Molar mass of B = 10.81g/mol

So, 1 mole of B = 10.81g

and 1 mole =

N

A

=

6.023

×

10

23

By combining,

10.81g of B =

6.023

×

10

23

atoms of B

thus,

35.76g of B =

6.023

×

10

23

10.81

×

35.76

35.76g of B =

1.991

×

10

24

48.176 × 10¹⁷ atoms of boron are present in 8.0 × 10⁻⁶ moles of boron.

Avogadro's number is the number of particles in one mole of substance. 6.022 × 10²³ is known as Avogadro's constant / Avogadro's number.

Avogadro's number = 6.022 × 10²³

How to find the number of atoms ?

Number of atoms = Number of moles  × Avogadro's Number

                             = 8.0 × 10⁻⁶ × 6.022 × 10²³

                             = 48.176 × 10¹⁷ atoms of boron

Thus, from the above conclusion we can say that 48.176 × 10¹⁷ atoms of boron are present in 8.0 × 10⁻⁶ moles of boron.

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The effect of errors on the calculated concentration of CI is significant.

A 10.00 mL diluted chloride sample was titrated with 0.02749 M AgNO3, and 16.51 mL AgNO, was required to reach the endpoint. The effect of errors on the calculated concentration of CI can be explained as follows:a. The student read the molarity of AgNO, as 0.02479 M instead of 0.02749 M. If the student read the molarity of AgNO, as 0.02479 M instead of 0.02749 M, then the experimentally calculated moles of Ag would be too high. Consequently, the calculated [CI] in the unknown would come out too low. b.

The student was past the endpoint of the titration when the final buret reading was taken. If the student was past the endpoint of the titration when the final buret reading was taken, then the experimentally determined moles of Ag would be too low. This would cause the calculated C1 concentration to come out too high. Consequently, the calculated moles of CI would come out too high. Therefore, the effect of errors on the calculated concentration of CI is significant.

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The drink that would typically have the highest concentration of alcohol is hard liquor. Hard liquors are made through the process of distillation, which increases the alcohol content to a higher level.

Hard liquor is defined as liquor with an alcohol content of 30% or more, or 60 proof or higher. This means that they have a higher concentration of alcohol than beer, wine, or other drinks.Liquors are classified into different categories based on their alcohol content, which determines the intensity of their flavors and aromas. Some of the most popular types of hard liquor include whiskey, vodka, rum, gin, tequila, brandy, and cognac.

These liquors are usually consumed in small quantities, and they are often mixed with other ingredients to create cocktails. Their high alcohol content makes them perfect for people who want to drink alcohol without consuming large amounts of liquid.The alcohol content of hard liquor varies depending on the type of liquor and the brand. However, the average alcohol content for most hard liquors is between 35% and 45%. Some of the strongest hard liquors can have an alcohol content of up to 90%. Therefore, it is important to consume hard liquor in moderation to avoid harmful effects on the body.

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Answer:

2000J

Explanation:

heat needed = mass × specific heat capacity × change in temperature

heat needed= 100×0.2×100

=2000J

The term that best describes a solution in a typical kitchen that has as much dissolved solute as it can hold is "saturated solution."

A saturated solution is a solution that contains the maximum amount of solute that can dissolve in a given solvent at a particular temperature and pressure. If more solute is added to a saturated solution, it will not dissolve and will form a separate phase or precipitate.

In a kitchen setting, a common example of a saturated solution is a solution of table salt (sodium chloride) in water. At room temperature, water can dissolve a certain amount of salt, and once this limit is reached, the solution becomes saturated. If more salt is added to the solution, it will not dissolve and will settle at the bottom of the container.

It is important to note that the solubility of a substance can vary depending on factors such as temperature and pressure. Therefore, a solution that is saturated at one temperature or pressure may not be saturated under different conditions.

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What is the volume contribution from of the suspended particles (pheavy) in part v: pressures and mixes of gases for testing 6 (150 heavyweight 50 light particles)? Thus, the heavy particle contribution to pressure is 17.5 atm.

The physical force applied to an object is referred to as force. Per unit area, a perpendicular force is delivered to the face of the objects. F/A is the basic equation for force. The pressure unit is P. Intrinsic, barometric, difference, and gage pressures are different types of force. This amount of force applied to a certain region is called to as pressure. The concept of pressure is crucial to fluid mechanics and is used to represent a gas's energy in the ideal gas, among many other physical applications.

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It is more effective to perform an extraction with several small portions of solvent as opposed to one large portion of solvent of equal volume because the amount of the material left in the trash will be less.

The extraction of certain ratio of the solute is able to the distribute among the phases during each extraction. The various extractions with the lesser amounts of the solvent are more efficient than the single extraction with the huge amount of solvent.

The extraction is about to maximize the outside field of the communication between the two solvents, we can easily get the more surface area in the contact with the fewer amounts.

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Answer:

a. Wiley has to find a way out of the tree he ran up.

b. Wiley has to trick the Hairy Man into turning himself into animals.

c. Wiley has to ask his mama for help to defeat the Hairy Man.

d. Wiley has to defeat the Hairy Man three times to make him go away.

Answer:

Wiley has to defeat the Hairy man three times to make him go away

Explanation:

The molecular weight of  \(C{2}\)\(H_{11}\)\(O_{3}\) is 83 u.

As given in the question:

the atomic mass of H = 1

the atomic mass of C = 12

the atomic mass of O= 16

To calculate the molecular mass of a molecule, multiply the subscript (number of atoms) by the atomic mass of each element in the molecule and add those masses together. Hence,

Molecular weight= (2 X 12) + (11 X 1) + (3 X 16)

                            = 24+ 11+ 48= 83 u.

Hence the molecular weight is 83 u.

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In an endothermic process, heat is a reactant. Exothermic means that the reaction mixture feels warm to the touch. Endothermic means that the reaction mixture feels chilly to the touch. The exothermic reaction produces heat as a byproduct.

When bonds in the reactants are broken in endothermic reactions, more energy is absorbed than is released when new bonds are created in the products. Endothermic refers to a process that takes in thermal energy (heat). The Greek words for "within heating" and "to heat" are represented by the prefix endo- and the suffix -thermic, respectively.

An endothermic response occurs when the temperature of the an isolated system decreases while the surroundings of the a non-isolated system warm up. In endothermic processes, the heat of reaction is typically positive (qrxn>0). Only when heat is absorbed do endothermic reactions like fusion, evaporation, or sublimation occur.

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The forces of attraction that exists between positive metal ions and their surrounding valence electrons is called: metallic bonds.

A chemical bond can be defined as the forces of attraction that exists between ions, crystals, atoms or molecules and they are mainly responsible for the formation of all chemical compounds.

In Chemistry, there are different types of chemical bonds and these are:

A metallic bond can be defined as the forces of attraction that exists between positive metal ions and their surrounding valence electrons.

This ultimately implies that, metallic bond are peculiar to positively charged metals but not negatively charged metals or non-metals.

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Explanation:

If the kinetic energy is less than the attractive forces, a liquid or solid will form.

The average kinetic energy of the particles in a solid is very less almost negligible this is because they have high attractive forces between their molecules as they are tightly packed in regular lattices and are vibrating about their mean positions.

Therefore, freezing of a liquid or the sublimation of a gas results in the formation of a solid. These two phase changes result in the overcoming of K.E completely.

Answer:

freezing

Explanation:

The two major differences of terrestrial planets are:

A terrestrial planet, or telluric planet, or solid planet, or rocky planet, is  described as a planet that is composed primarily of silicate rocks or metals.

Terrestrial planets are covered with solid surfaces, while the Jovian planets usually  have gaseous surfaces.

Mercury, Venus, Earth, and Mars are examples of  the terrestrial planets, while the Jovian planets are Jupiter, Saturn, Uranus, and Neptune.

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The percent ionization of 0.20 M iodic acid is approximately 92.3%.

To determine the percent ionization of iodic acid (HIO3), we need to calculate the concentration of ionized H+ ions compared to the initial concentration of HIO3.

The ionization of iodic acid can be represented by the following equilibrium equation:

HIO3(aq) ⇌ H+(aq) + IO3-(aq)

The equilibrium constant expression (Ka) for this reaction is given as:

Ka = [H+(aq)][IO3-(aq)] / [HIO3(aq)]

Given that the Ka value for iodic acid is 1.7 × 10^(-1), we can set up the following expression:

1.7 × 10^(-1) = [H+(aq)][IO3-(aq)] / [HIO3(aq)]

Since the initial concentration of HIO3 is 0.20 M, we can assume that the concentration of H+ and IO3- ions formed at equilibrium is x.

Thus, the equilibrium expression becomes:

1.7 × 10^(-1) = x^2 / (0.20 - x)

To simplify the calculation, we can assume that x is very small compared to 0.20, so we can approximate 0.20 - x as 0.20.

1.7 × 10^(-1) = x^2 / 0.20

Cross-multiplying, we get:

0.034 = x^2

Taking the square root of both sides, we find:

x ≈ 0.1846

The percent ionization is given by:

Percent Ionization = (concentration of ionized H+ ions / initial concentration of HIO3) * 100

Plugging in the values, we have:

Percent Ionization = (0.1846 / 0.20) * 100

Percent Ionization ≈ 92.3%

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A suitable solvent to use for the mobile phase of a normal phase TLC is a nonpolar solvent, such as hexane or heptane.

In normal phase TLC (Thin-Layer Chromatography), the stationary phase is polar (usually a polar silica gel or alumina) and the mobile phase is nonpolar. The goal is to separate and analyze polar compounds based on their relative affinity to the stationary and mobile phases.

Since the stationary phase is polar, a nonpolar solvent is used as the mobile phase to ensure good separation and elution of the analytes. Nonpolar solvents like hexane or heptane are commonly employed in normal phase TLC as they have low polarity and do not strongly interact with the polar stationary phase. This allows the analytes to migrate and separate effectively based on their polarity.

Using a nonpolar solvent as the mobile phase ensures that the elution order of compounds is determined mainly by their polar interactions with the stationary phase, making it suitable for normal phase TLC.

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Answer:

Deep partial-thickness wounds

2. The phase changes that will occur from 100 to 500 °C at 1 atm of pressure are sublimation followed by deposition.

Based on the information provided, the correct answer is:

2. sublimation, followed by deposition

Following the dashed line at 1 atm of pressure on the phase diagram from 100 to 500 °C, the phase changes that will occur are sublimation, followed by deposition.

At lower temperatures, the substance will undergo sublimation, transitioning directly from the solid phase to the gas phase. As the temperature increases, the substance will exist as a gas.

However, at higher temperatures, as the temperature decreases again, the gas will undergo deposition, transitioning directly from the gas phase back to the solid phase.

Therefore, the substance will experience sublimation and deposition as the temperature changes within the specified range, without undergoing melting or vaporization.

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The balanced half-reaction describing the reduction of solid diiodine (I2) to aqueous iodide anions (I-) can be represented as follows:

I2 + 2e- -> 2I-

In this half-reaction, two electrons (2e-) are added to diiodine (I2), resulting in the formation of two iodide anions (2I-). This reduction process involves the gain of electrons by diiodine, leading to the conversion of neutral diiodine molecules to negatively charged iodide ions.

The balanced equation illustrates that for every molecule of diiodine (I2) reduced, two iodide anions (I-) are formed. The transfer of electrons from the reducing agent (in this case, the diiodine) to the oxidizing agent results in the formation of the reduced species (iodide ions).

It is important to note that this is only a half-reaction, and the overall redox reaction would require a corresponding oxidation half-reaction to complete the balanced equation. The reduction half-reaction described above represents the reduction of diiodine to iodide ions.

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Answer: chemical

Explanation:

Energy, potential energy, is stored in the covalent bonds holding atoms together in the form of molecules. This is often called chemical energy. Except at absolute zero (the coldest temperature it is possible to reach), all molecules move.

Answer:

C

Explanation:

It is most likely non metal with a high electronegativity.

In a gas, the average particle speed and the speed of sound are nearly  equal. In a gas mixture in thermal equilibrium, the speed of a typical helium atom  is compared to that of a typical nitrogen molecule. There are 3 1023 atoms in He, and 6 1023 molecules in N.

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The object's potential energy is highest at the height from which it is dropped. Its potential energy diminishes while its kinetic energy grows as it descends.

PE = 1 kg

g = 9.8 m/s2

h = 100 m PE =? J m

PE = 1 kg 9.8 m/s2 = 980 kg•m2/s2 = 980 J

In contrast to potential energy, an object's kinetic energy is related to other fixed and moving objects in its immediate environment. For example, if the object is positioned at a larger height, its kinetic energy will be greater.

According to its mass and beginning height, an item carried at a specific height above the ground has an initial potential energy (PE). When the thing is released, the velocity of the object rises as it falls. This increase in velocity increases the object's kinetic energy (KE).

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The equilibrium constant for the reaction 2SO2(g) + O2(g) → 2SO3(g) is Kc = 0.113.

This value is determined using the reaction quotient equation, which calculates the ratio of product concentrations to reactant concentrations at equilibrium.

The number of significant digits in the equilibrium constant is dependent on the number of significant digits in the concentrations of the reactants and products.

In this case, the concentration for each reactant and product is only known to two significant digits, so the equilibrium constant is also only known to two significant digits. As a result, the equilibrium constant for this reaction is Kc = 0.113.

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By diluting the acid during the titration, the concentration of the acid will be lower than intended, leading to an underestimated value of Ka.

What is titration and why is it performed?

Titration is a laboratory technique used to determine the concentration of a substance in a solution by reacting it with a known concentration of another substance (known as the titrant) of known volume. Titration is commonly used to determine the concentration of an unknown substance in a solution.

If you titrated a weak acid and left a significant amount of water in the buret, it would dilute the acid and affect the concentration of the acid used in the titration. This, in turn, would impact the calculated value of the acid's dissociation constant (Ka).

The dissociation constant (Ka) is a measure of the extent to which an acid dissociates or ionizes in water. It is determined by the equilibrium concentration of the acid and its conjugate base. By diluting the acid during the titration, the concentration of the acid will be lower than intended, leading to an underestimated value of Ka.

Therefore, by diluting the acid during the titration, the concentration of the acid will be lower than intended, leading to an underestimated value of Ka.

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The quantity, in liters, of \(NO_2\) that is required to completely react with 125 g of water will be 467 liters.

From the equation of the reaction, the mole ratio of  \(NO_2\) and water is 3 to 1. For every 1 mole of  \(NO_2\) that reacts, 1/3 mole of water is required.

Recall that: mole = mass/molar mass

Mole of 125 g of water = 125/18

                                     = 6.944 moles

Thus, the equivalent mole of  \(NO_2\) required will be:

6.944 moles x 3 = 20.833 moles

At standard temperature and pressure, 1 mole of a gas occupies 22.4 L of volume.

Thus, 20.833 moles of  \(NO_2\) will be: 22.4 x 20.833

                                                  = 467 Liters

In other words, the volume of  \(NO_2\) that will react with 125 g of water is 467 liters.

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