In humans, these organs are part of a larger system, the ________ system.

1) List the known and unknown quantities.

Sample: Copper.

Isotopes

Copper-63.

Abundance: 69.15%

Copper-65.

Abundance: 30.85%

2) According to the percentages you should expect to find Copper-63 the most in the sample.

Two correct answers which describe how water mixes in a thermohaline current are A. Cold water sinks under warmer water. And D. Saltier water sinks under less salty water.

Thermohaline Current is caused by variations in the seawater's surface density from pole to equator. Variations in temperature (thermal) and salinity (haline) affect the equator-to-pole surface. On Earth's climate, the thermohaline ocean currents have a significant impact on circulating heat across the planet.

In the thermohaline current, warmer, fresher water masses are less dense and float, while colder, saltier water masses are more dense and sink. Due to its higher density, this cold, salty water sinks.

So, it is obvious that the correct answers are:

A. Cold water sinks under warmer water.

D. Saltier water sinks under less salty water.

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Rutherford's models

There are known as the region where electrons are found especially in the nucleus.

According to the five basic atomic models which have contributed to the structure of the atom itself, the Rutherford's models of the atom include a structure that is mostly made of empty space compared to thomson that proposed the plum pudding model of the atom

Answer:

The most common reason for alloying is to increase the strength of a metal. This requires that barriers to slip be distributed uniformly throughout the crystalline grains. On the finest scale, this is done by dissolving alloying agents in the metal matrix (a procedure known as solid solution hardening

Explanation:

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The central atom in PF\(_5\) violates the octet rule. Therefore, the correct option is option B among all the given options.

The hypothesis that main-group elements typically bind in a way that each atom possesses eight electrons within its valence shell, providing it the same electrical configuration that a noble gas, is reflected in the octet rule, a chemical rule of thumb.

Although more broadly applicable to the s-block or p-block on the periodic table, the rule is particularly applicable to nitrogen, oxygen, carbon, as well as halogens. The central atom in PF\(_5\) violates the octet rule. Therefore, the correct option is option B among all the given options.

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Complete question :

Use the equation qliquid = m × c × ΔT to calculate the heat gained by the cold liquid. Use the specific heat for the liquid you selected.

m = 248.9 g ; T = 72.6°C ; C = 3.73 j/g°C

Use the equation qwater = m × c × ΔT to calculate the heat lost by the hot water. Show your work using the problem-solving method shown in previous rubrics.

M = 237 g ; T = 41.2°C ; C = 4.184 j/g°C

Answer:

Quantity of heat gained = 67401.6 Joules

Quantity of heat lost by hot water = 40854.25 Joules

Explanation:

The heat gained by cold liquid :

Q = m × c × ΔT

m = 248.9 g ; T = 72.6°C ; C = 3.73 j/g°C

Q = 248.9 * 3.73 * 72.6

Q = 67401.6 Joules

Quantity of heat gained = 67401.6 Joules

Heat lost by hot water :

m × c × ΔT

M = 237 g ; T = 41.2°C ; C = 4.184 j/g°C

Q = 237 * 41.2 * 4.184

Q = 40854.25 Joules

Quantity of heat lost by hot water = 40854.25 Joules

Step 1 - Understanding how to convert Celsius to Kelvin

Kelvin is called the absolute temperature because its zero is based on the complete absence of molecular motion (which is possible in theory, but quite impossible to reach experimentally).

The temperature in Kelvin is related to the temperature in Celsius by the following expression:

That is, to obtain the temperature in Kelvin, we just need to add 273.15 to the temperature in Celsius.

Step 2 - Using the expression to solve the exercise

The boiling point of propane is -42.0°C. Note that this is our T(°C). To obtain T(K) let's plug the value in the equation:

The equivalent temperature in Kelvin would be thus 231.15 K.

The question his incomplete, the complete question is;

Which of the following required Bohr's model of the atom to need modification

A. energies of electrons are quantized

b. electrons do not follow circular orbits around the nucleus

c. Quantized electrons energies are responsible for emission spectra lines

d. an electrons energy increases the farther it moves from the nucleus

Answer:

electrons do not follow circular orbits around the nucleus

Explanation:

Neils Bohr's model of the atom closely follows the planetary model of Rutherford, hence is it sometimes referred to as the Bohr-Rutherford's model of the atom. Its main points are that;

Electrons are found in circular orbits

Electronic transition within the atom leads to spectral lines

The energy of an orbit is related to its size.

One major refinement of the Bohr's model of the atom is the Bohr-sommerfield model. Sommerfeld added that electrons are found in elliptical rather than circular orbits. This Bohr-sommerfield model was able to explain atomic spectral effects, such as the Stark effect in spectral line splitting.

Hence, the fact that electrons are found in elliptical rather than circular orbits was a major failure of Bohr's original proposition.

Answer:

Electrons do not follow circular orbits around the nucleus

Explanation:

A rainbow is produced through a proces that includes refraction, reflection, and dispersion of  sunlight.

A rainbow is formed when sulinght is refracted and reflected by rain drops in the atmospher.

The sunlight is split into its component colors, which is why rainbows appear as having an array of colors. This is due to each color being bent by a different amount during refraction.

The colors of a rainbow are always in the same order, with red on the outside and violet on the inside.

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Answer:

70.91 kJ

Explanation:

The amount of energy (in kJ) required to increase the temperature of 255 g of water from 25.2 C to 90.5 C can be calculated using the formula:

Q = m * c * ΔT

Where Q is the amount of energy, m is the mass of the substance, c is the specific heat, and ΔT is the change in temperature.

Substituting the given values:

m = 255 g

c = 4.184 J/g C

ΔT = (90.5 - 25.2) C = 65.3 C

Q = 255 g * 4.184 J/g C * 65.3 C

Q = 70905.564 J

Q = 70.91 kJ (rounded to two decimal places)

Therefore, the amount of energy required to increase the temperature of 255 g of water from 25.2 C to 90.5 C is 70.91 kJ.

Single-solvent recrystallization is a laboratory technique used to purify solid compounds.

The necessary steps are:

Choose the appropriate solvent: It is important to choose a solvent that has a high solubility for the solute at elevated temperatures and a low solubility at room temperature.

Dissolve the solute in the warm solvent: The solute is dissolved in a minimum amount of the chosen solvent and heated until it is fully dissolved.

Performing a filtration: The mixture is then filtered to separate the solute from any impurities or undissolved solids. Gravity filtration or vacuum filtration can be used.

Dry the solute: Finally, the purified solute is dried by evaporating any remaining solvent.

In summary, the necessary steps for a single-solvent recrystallization experiment are choosing the appropriate solvent, dissolving the solute in the warm solvent, performing a filtration, and drying the solute.

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The number of moles of H that are in the sample of the unknown compound is 1.

The International System of Units uses the mole (symbol: mol) as the unit of material quantity. The number of elemetary entities of a particular substance are present in an object or sample is determined by the quantity of that material.

We know that the formula for finding a number of moles of any compound is equal to the given mass of the compound divided by the molecular mass (or atomic mass ) of the compound i.e.

No. Of moles = given mass / molecular mass

For H we know the atomic mass or molecular mass (to two decimal places) = 1.01 u

(Where u is the atomic mass unit ).

So, (given mass / 1.01 u ) moles of H are in the sample of the unknown compound.

Let say if given mass is 1.01 gram then the number of moles of H = 1.01 gram / 1.01 u

So, the number of moles of H = 1

Therefore, the number of moles of H that are in the sample of the unknown compound is 1.

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Pressure and volume can be regarded as the entity that is inversely proportional.

It should be noted that this explanatin an be done using the law in chemistry which is the Boyle's law which states that, for a given amount of gas and constant temperature, the volume is inversely proportional to the pressure.

However the Equal quantities of all gases can be seen to have same number of molecules when subjected to the same temperature and pressure (Avogadro's law).

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The rate of the given reaction is 0.00197 M/s.

The balanced chemical equation of the reaction is:

CO (g) + NO₂ (g) → CO₂ (g) + NO (g)

From the equation, 1 mole of CO produces 1 mole of CO₂, and hence the number of moles of CO2 produced is equal to the number of moles of CO consumed.

The concentration of CO₂ produced = 0.123 M.

Therefore, the concentration of CO consumed is also 0.123 M.

The rate of reaction is given by the formula:

where Δ[C] is the change in concentration and Δt is the change in time.

Over 62.3 seconds, the concentration of CO decreases from 0 M to 0.123 M.

Δ[C] = 0.123 M - 0 M

Δ[C]  = 0.123 M

Δt = 62.3 s

Substituting the values in the formula, we get:

rate of the reaction = Δ[C]/Δt

rate of the reaction = 0.123 M/62.3 s

rate of the reaction = 0.00197 M/s

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Answer: 4 miles

Explanation:

Riding the bike 12 mph (miles per hour) for one hour, we would ride the bike 12 miles. Since 20 minutes is 1/3 of a hour, divide 12 by 3 to find out how far the biker traveled in 1/3 of the time: 4 miles Hope this helps

Hello!

\(\large\boxed{\frac{5}{3}\text{ hours} \text{ or }100 \text{ min}}\)

Use the equation d = s · t where:

s = speed

t = time

d = distance

Plug in the given distance and speed:

20 = 12 ·t

Divide both side by 12 to isolate for t:

20/12 = t

Simplify:

5 / 3 = t

Therefore, it took 5/3 hours to bike. We can convert this to minutes if necessary:

5/3 · 60 min (in one hour) = (60 · 5) / 3 = 100 min.

Answer:

ok, here is your answer

Explanation:

i am going to solve this problem by using the ICE table method which is an easy method to determine the pH of a weak base with the given data of the problem.Given:Initial volume of NH3 solution (Vi) = 75.0 mLInitial concentration of NH3 solution (Ci) = 0.200 MInitial moles of NH3 solution (Ni) = Ci x Vi = 0.200 M x 75.0 mL = 0.0150 molesKb = 1.8 x 10^-5Moles of HNO3 added (n) = 0.500 M x 17.0 mL = 0.00850 molesVolume of NH3 solution after the addition of HNO3 (Vf) = 75.0 mL + 17.0 mL = 92.0 mLConcentration of NH3 solution after the addition of HNO3 (Cf) = Ni / Vf = 0.0150 moles / 92.0 mL = 0.163 MTo find the pH after the addition of 17.0 mL of HNO3, we need to use the ICE table method.ICE table method:Initial: NH3 + H2O ⇌ NH4+ + OH-Change: -x 0 +x +xEquilibrium: 0.0150 - x 0 x xKb = [NH4+][OH-] / [NH3]1.8 x 10^-5 = x^2 / 0.163Solving for x, x = 0.00171 M[OH-] = 0.00171 M[OH-] = Kw / [H3O+] = 1.0 x 10^-14 / [H3O+][H3O+] = 5.85 x 10^-12pH = -log[H3O+]pH = -log(5.85 x 10^-12)pH = 11.23Therefore, the pH after the addition of 17.0 mL of HNO3 is approximately 11.23.

Answer: B. \(\text{CH}_{3}\text{COO}^{+}\)

Explanation:

To find the conjugate base, you add a hydrogen ion and add 1 to the overall charge.

CH\(_3\)COO⁻ is the conjugate base of  CH\(_3\)COOH in the given reaction. Therefore, the correct option is option B.

Conjugate acids and bases are ideas included in the Bronsted-Lowry acid-base theory. An acid losses a hydrogen ion as it splits into its electrons in water. The conjugate base of the acid is the species that results.

A conjugate base comprises the base participant, X-, of two compounds that convert into one another by acquiring or losing a proton, according to a more comprehensive definition. In a chemical process, the conjugate base has the capacity to either gain and absorb a proton. The proton and hydrogen is given away in the process by the conjugate acid. CH\(_3\)COO⁻ is the conjugate base of  CH\(_3\)COOH in the given reaction.

Therefore, the correct option is option B.

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0.0205 moles of water were lost if the amount of water lost was 0.369 grams. The given answer is in three significant figures with including zero before the decimal.

To find the number of moles of water lost, we need to know the molar mass of water (H2O).

Molar mass is the sum of the atomic masses of all the atoms present in a molecule.

Since the molecule of water contains two atoms of hydrogen and one atom of oxygen, the molar mass of water is given by the sum of the atomic masses of two hydrogen atoms and one oxygen atom, which is: 2(1.008 g/mol) + 1(15.999 g/mol) = 18.015 g/mol

Therefore, one mole of water has a mass of 18.015 g.

The number of moles of water lost can be calculated using the following formula: Number of moles = Mass of substance / Molar mass of substance

Substituting the given values, we get: Number of moles = 0.369 g / 18.015 g/mol = 0.0205 mol

Thus, 0.0205 moles of water were lost if the amount of water lost was 0.369 grams.

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Answer:

The colorful screenshot is the last Screenshot for the Virual Lab Project. And the last screenshot is the Lab Report. Hope this Helps!

Explanation:

Some might wonder why I am giving out the anwsers because I struggled with these assignmnets and I felt like helping others. Have a nice day/night!

Answer:

The correct answer is - anhydrous aluminum chloride is covalent whereas anhydrous magnesium chloride is ionic.

Explanation:

Anhydrous aluminum chloride is a covalent compound and we know that covalent compounds have less or no polarity. Organic compounds or solvents are mostly non-polar in nature. And it is a thumb rule that like-dissolves-like.

Thus they dissolve covalent molecules like anhydrous aluminum chloride.

Anhydrous magnesium chloride is an ionic compound that tends to interact with a polar solvent but not in a non-polar solvent such as organic solvents.

Anhydrous aluminum chloride is fairly soluble in the organic solvent while anhydrous magnesium chloride is insoluble​ because anhydrous aluminum chloride is covalent whereas anhydrous magnesium chloride is ionic.

AlCl3 quite simply accepts electrons from other atoms, in an try and get a full valence shell of eight electrons. It's why it normally behaves as a Lewis acid. In the response under, the Al atom accepts a lone pair of electrons from a Cl atom.

AlCl3 is hygroscopic and has a great affinity for water. Therefore, aluminum chloride dissolves in water partially.

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-0.109 is the answer :)

You could basically just do column subtraction

Answer:

Phenols do not exhibit the same pka values as other alcohols;

They are generally more acidic.

Using the knowledge that hydrogen acidity is directly related to the stability of the anion formed, explain why phenol is more acidic than cyclohexane.

Explanation:

According to Bromsted=Lowry acid-base theory,

an acid is a substance that can release \(H^{+}\) ions when dissolved in water.

So, acid is a proton donor.

If the conjugate base of an acid is more stable then, that acid is a strong acid.

In the case of phenol,

the phenoxide ion formed is stabilized by resonance.

\(C_6H_5OH -> C_6H_5O^- +H^+\)

The resonance in phenoxide ion is shown below:

Whereas in the case of cyclohexanol resonance is not possible.

So, cyclohexanol is a weak acid compared to phenol.

Answer: The correct answer for the question would need to be 160 k

Explanation: I used the answer that was posted and it was inincorrect so I solved it myself to get the correct one

Answer:

215.9 cm

Explanation:

1 foot= 30.5cm

30.5cm times 7 1/12=215.9cm

The given height of David is 7 ft, 1.0 inch, so in centimeters, the height will be 216.4 cm.

A conversion factor is a number that is used to multiply or divide one set of units into another. When converting to an equal value, the appropriate conversion factor must be used.

We must convert one unit to another in order to achieve accuracy and avoid measurement confusion.

We do not, for example, measure the length of a pencil in kilometers. In this case, one must convert kilometers (km) to centimeters (cm) (cm).

To convert feet to centimeters, multiply the given foot length by 30.48 cm.

So,

Height in cm will be = 7.1 x 30.48

Height in cm = 216.4cm

Thus, the height of David in centimeters is 216.4 cm.

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Answer:

Radiation

Explanation:

Sun rays shine on earth. Thats radiation.

The pOH of the 0.001 M NaOH solution is approximately 3.

To determine the pOH of a solution, we need to know the concentration of hydroxide ions (OH-) in the solution.

In the case of a 0.001 M NaOH solution, we can assume that all of the NaOH dissociates completely in water to form Na+ and OH- ions. Therefore, the concentration of hydroxide ions in the solution is also 0.001 M.

The pOH is calculated using the equation:

pOH = -log[OH-]

Substituting the concentration of hydroxide ions, we have:

pOH = -log(0.001)

Using a calculator, we can evaluate the logarithm:

pOH ≈ 3

Therefore, the pOH of the 0.001 M NaOH solution is approximately 3.

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Answer: dunno but thanks for the points xd

Explanation:

Answer:

question not clear can u rewrite

The Correct answer is D

Hydronium

hydroxide