Suppose you had four spoons, the same size and shape, made out of glass plastic steal and wood which spoon handle would get hot the quickest when the spoons are placed in a pan of hot water.

Answer: is A

Explanation:

how becuase i just take the test

Answer:

A

Explanation:

Answer:56

Explanation:YW

Answer: kinda loose, with molecular forces being very less, more like the arrangement of particles in the gas.

Explanation:

The water molecules in the steam produced when liquid water is evaporated would be very loose and spread out very quickly due to the very weak molecular forces. The heat provided to the water weakens and breaks the bonds between the particles, causing it to spread out much easily- Evaporate, making steam.

Answer:

Answer is flagella

Explanation:

I hope it's helpful!

Answer:

They both combine with The help of valency, which is the combining capacity of elements

Explanation:

I find it easier to understand valency as part of the Bhor’s model of an atom.

In his model, it was stated that electrons are spread around the nucleus in such a way that there are rings around the model. Each ring has a n value. So, k has 1, l has 2, m has 3 and n has 4...

what you need to know to find the number of electrons in each ring is to solve the formula 2n squared

Then, the valency is the 8 minus the number of electrons in the outermost shell. Remember that 8 is max number I;outer most shell. If you try it out for oxygen, you will get the value of 2 remaining, which can be gained if combined with calcium.

Hope it helps

Answer:

The correct answer is (A) "the molar amount of the gas".

Explanation:

I got it correct on Edge.

a) The sphere emits thermal radiation at a rate of 139.75 Watts.

b) The sphere absorbs thermal radiation at a rate of 37.66 Watts.

c) The sphere's net rate of energy exchange is 102.09 Watts.

To calculate the rates of thermal radiation emission and absorption, we can use the Stefan-Boltzmann law, which states that the rate of thermal radiation emitted or absorbed by an object is proportional to its surface area, temperature, and the Stefan-Boltzmann constant.

a) The rate of thermal radiation emitted by the sphere can be calculated using the formula:

Emitting Rate = emissivity * surface area * Stefan-Boltzmann constant * (\(temperature^4 - environment\ temperature^4\))

Plugging in the given values:

Emitting Rate = \(0.924 * (4\pi * (0.457)^2) * 5.67 \times 10^{-8} * ((32.2 + 273.15)^4 - (82.9 + 273.15)^4)\)

Emitting Rate ≈ 139.75 Watts

b) The rate of thermal radiation absorbed by the sphere can be calculated in a similar way but using the environment temperature as the object's temperature:

Absorbing Rate = emissivity * surface area * Stefan-Boltzmann constant * (\(environment\ temperature^4 - temperature^4\))

Plugging in the given values:

Absorbing Rate = \(0.924 * (4\pi * (0.457)^2) * 5.67 \times 10^{-8} * ((82.9 + 273.15)^4 - (32.2 + 273.15)^4)\)

Absorbing Rate ≈ 37.66 Watts

c) The net rate of energy exchange is the difference between the emitting rate and the absorbing rate:

Net Rate = Emitting Rate - Absorbing Rate

Net Rate = 139.75 Watts - 37.66 Watts

Net Rate ≈ 102.09 Watts

Therefore, the sphere emits thermal radiation at a rate of 139.75 Watts, absorbs thermal radiation at a rate of 37.66 Watts, and has a net rate of energy exchange of 102.09 Watts.

Note: The units for all the rates are Watts.

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Answer:

Cr(NO3)3 (aq) +K3PO4 (s)

Explanation:

Answer: B because it has a longer wavelength than A

Good luck!

Osmoregulators are the organisms that keep the osmotic balance of the body fluids independent of the surrounding environment. In mammals, hormones play a significant role in regulating the water balance of the body. Among different hormones, antidiuretic hormone (ADH) and aldosterone are essential for the regulation of water and electrolyte balance in the body.

ADH is produced by the hypothalamus, stored in the posterior pituitary gland, and secreted by the pituitary gland in response to high blood osmolarity. It targets the collecting ducts in the kidneys, increases water reabsorption, and decreases urine output. Thus, it helps in the conservation of water in the body fluids.Aldosterone is produced in the adrenal cortex in response to low blood pressure or low blood volume. It increases the reabsorption of sodium ions (Na+) and water in the distal tubules of the nephrons and secretion of potassium ions (K+) and hydrogen ions (H+) in urine. Thus, it helps in the maintenance of electrolyte balance and volume of the body fluids.Besides, other hormones such as vasopressin, renin, angiotensin, and atrial natriuretic hormone (ANH) also play a role in the osmoregulation of the body fluids.In the given options, option (b) - Aldo and ADH will act as osmoregulators. Thus, the correct option is b. Aldo and ADH.

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Explanation:

A is the answers for the question

The product formed in the combustion reaction is generally the oxidized fuel. The combustion reactions are exothermic. The products of the given reaction are CO₂ and H₂O. The correct option is D.

A  chemical reaction in which the fuel undergoes oxidation by reacting with a powerful oxidizing agent which results in the release of energy generally in the form of heat is defined as the combustion. All combustion reaction will not results in fires.

The combustion of LPG fuel which is used for cooking food involves the combustion reaction between the oxygen present in the atmosphere and the liquified petroleum gas. The explosion of fire works also indicates the combustion reaction.

The given reaction is given as:

CH₂(g) + O₂(g) → CO₂(g) + H₂O(g)

The substances on the right-hand side are called the products.

Thus the correct option is D.

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In the given scenario, one of the four students correctly calculated the number of molecules in 25 g of water. The explanation for this correct calculation lies in the concept of Avogadro's number and molar mass.

Avogadro's number is a fundamental constant representing the number of entities (atoms, molecules, ions, etc.) in one mole of a substance, which is approximately 6.022 x 10^23. Molar mass refers to the mass of one mole of a substance and is expressed in grams per mole (g/mol).

Out of the four students, the one who correctly calculated the number of molecules in 25 g of water would have followed these steps. Firstly, they would have determined the molar mass of water, which is approximately 18 g/mol (2 hydrogen atoms with a molar mass of 1 g/mol each, and 1 oxygen atom with a molar mass of 16 g/mol). Next, they would have converted the mass of water (25 g) to moles by dividing it by the molar mass (25 g / 18 g/mol ≈ 1.39 mol). Finally, they would have multiplied the number of moles by Avogadro's number to find the number of molecules (1.39 mol x 6.022 x 10^23 molecules/mol ≈ 8.37 x 10^23 molecules). Therefore, this student arrived at the correct answer of approximately 8.37 x 10^23 molecules in 25 g of water.

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Answer:

firstly:scientist communicate with each other to share what they learn

secondly; they question and check each other's work

Answer:

Forming a hypothesis

Explanation:

Cuz why not

Answer:

The earlier bog bodies that were discovered in the 1600s might have not been preserved properly due to a lack of knowledge on how to preserve them or a lack of awareness of their significance. It is also possible that they might have decayed and decomposed over time and not survived till the present day. However, the bog bodies found after the late 1800s were preserved and studied extensively due to the increasing awareness and understanding of their historical and archaeological significance.

Explanation:

Hope this helped!! Have a great day/night!!

A nucleus maintains its stability despite being composed of positively charged particles due to the strong nuclear force that overcomes the repulsion between the protons.

The neutrons in the nucleus play a crucial role in maintaining stability. Neutrons have no charge and do not contribute to the electrostatic repulsion. Their presence helps to increase the attractive nuclear force, balancing the repulsive force between protons. This shielding effect allows the nucleus to remain stable.
Another important factor is that the Coulomb force, which describes the electrostatic repulsion between charged particles, is not applicable at the nuclear level. The range of the Coulomb force is limited, and its influence diminishes at very short distances inside the nucleus. Instead, the strong nuclear force takes over and becomes the dominant force, binding the protons and neutrons together.
Additionally, the surrounding electrons in an atom contribute to the nucleus's stability. Electrons are negatively charged and are located in the electron cloud surrounding the nucleus. Their negative charge helps neutralize the positive charge of the protons, reducing the overall electrostatic repulsion within the atom. This electron-proton attraction further contributes to the stability of the nucleus.

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Answer:

C3H6O + 4O2 → 3CO2 + 3H2O

Explanation:

I think that's the answer

Hope this helps :)

Determine the type of solid based on the description. Choose between metallic solid, network solid, molecular solid, ionic solid, and amorphous solid. a. This solid is ductile and electrically conductive. b. This solid has a low melting point and is not conductive.

See the explanation.

A represents a Metallic Solid.

Consider the physical properties of metals once more.

Metals are used in

As we can see, ductility and electrical conductivity are both metallic properties.

B is a chemical solid.

When atoms share electrons, molecules form. Because there are no free electrons in molecules, they do not conduct electricity.

Second, in the solid state, molecules are held together by weak dispersion forces, so molecular

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Magnesium has a higher melting point than sodium. Calcium is used for the crucible because it has a higher melting point than sodium.

The melting and boiling points of metals increase across the period. Magnesium has a higher melting point because it contributes one additional electron per atom than sodium in the electron sea.

The crucible that will be used for melting sodium must have a higher melting point than sodium. Therefore, a calcium crucible should be used.

The metal that has the lowest melting point must be the metal that has the lowest density and therefor is easiest to bend. That is metal B.

A very important property of metals is ductility. It allows a metal to be drawn into sheets without breaking. Hence, the property of metals that explains the fact that the towers of the bridge does not break into pieces like glass but rather bends is called ductility.

Examining the graph that shows the test the elongation of three different metals against the force, is the correct order of the metals according to their suitability to be used for suspenders is A, B, C.

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The measurement of expired CO₂ that typically provides a numeric display of the partial pressure of CO₂ in torr or mmHg is the capnometry.

The capnometry measurement of the  CO₂ , carbon dioxide is the measurement in the expired air and it provides the clinician with the noninvasive measurement of systemic metabolism and the ventilation. it is used to determine the correlation in between the tidal CO₂  and the partial CO₂  in the non intubated breathless patents.

Thus, the measurement if the expired CO₂  that shows the partial pressure of the CO₂  is the capnometry.

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The Watson-Crick base pair is the conventional way that DNA and RNA nucleotides interact with one another to form a double helix.

It is made up of complementary base pairs, including adenine (A) with thymine (T) and guanine (G) with cytosine (C). The non-Watson-Crick base pair is a DNA structure in which the nucleotide bases are paired in a way that is different from the traditional Watson-Crick base pairing.

This type of pairing can happen when two nucleotides have an unusual arrangement of hydrogen bonding that allows them to pair up despite the fact that they are not complementary in the usual sense. The most common non-Watson-Crick base pairs are A-U and G-U pairs, which are found in RNA, but they can also occur in DNA under certain circumstances.

Other types of non-Watson-Crick base pairs include Hoogsteen base pairs and wobble base pairs. In summary, a non-Watson-Crick base pair is a type of nucleotide pairing that differs from the conventional Watson-Crick base pair, and it can occur in DNA and RNA under certain conditions.

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The partial pressure of gas B in a mixture of two gases with a total pressure of 4.00 atm and 1.50 atm of gas A is 2.50 atm.

To calculate the partial pressure of gas B, we use the following formula:

Partial Pressure of Gas B = Total Pressure - Partial Pressure of Gas A

In this case, the Partial Pressure of Gas B = 4.00 atm - 1.50 atm = 2.50 atm.

The partial pressure of a gas in a mixture is determined by the proportion of that gas relative to the total pressure of the mixture.

In this case, gas A is contributing 1.50 atm to the total pressure of 4.00 atm, meaning that it makes up 37.5% of the total pressure. Therefore, gas B must contribute 62.5% of the total pressure, which is 2.50 atm.

It is important to note that the partial pressure of each individual gas in a mixture is independent of the total number of moles of each gas in the mixture.

Therefore, the partial pressure of gas B can be determined even if we do not know the number of moles of each gas in the mixture.

In summary, the partial pressure of gas B in a mixture of two gases with a total pressure of 4.00 atm and 1.50 atm of gas A is 2.50 atm. This can be determined by subtracting the partial pressure of gas A from the total pressure of the mixture.

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Answer:

C "Plants die faster when they're overwatered than when they're underwatered.

Answer:

c plants die faster when they're overrated then when there underwater

i. Dissociate in solution: Electrolytes

ii. Do not dissociate in solution: Non-electrolytes

iii. Conduct electricity in solution: Electrolytes

iv. Do not conduct electricity in solution: Non-electrolytes

i. Dissociate in solution: Electrolytes are substances that dissociate into ions when dissolved in water or other solvents. This dissociation allows them to conduct electricity in solution.

ii. Do not dissociate in solution: Non-electrolytes are substances that do not dissociate into ions when dissolved in water or other solvents. They remain as intact molecules and do not conduct electricity.

iii. Conduct electricity in solution: Electrolytes, by definition, are substances that dissociate into ions in solution. These ions are charged particles that can move and carry electric current, allowing electrolytes to conduct electricity.

iv. Do not conduct electricity in solution: Non-electrolytes do not dissociate into ions in solution, so they do not have charged particles that can carry electric current. As a result, non-electrolytes do not conduct electricity in solution.

In summary, electrolytes dissociate in solution and conduct electricity, while non-electrolytes do not dissociate and do not conduct electricity in solution.

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The molar concentration of NaCl in the normal saline solution is 0.00139 M.

To calculate the molar concentration of NaCl in the normal saline solution, we need to first calculate the number of moles of NaCl present in 100.0 ml of the solution.

The molecular weight of NaCl is 58.44 g/mol (22.99 g/mol for Na and 35.45 g/mol for Cl). Therefore, the number of moles of NaCl present in 0.900 g of NaCl can be calculated as:

0.900 g NaCl / 58.44 g/mol = 0.0154 moles NaCl

Next, we need to calculate the number of moles of NaCl present in 100.0 ml of the solution. We know that the solution contains 0.900 g of NaCl in 100.0 ml of water, which is equivalent to 0.900 g/100.0 g or 0.00900 g/g of solution.

Therefore, the number of moles of NaCl in 100.0 ml of the solution is:

0.00900 g/g x 0.0154 moles/g = 0.000139 moles NaCl

Finally, we can calculate the molar concentration of NaCl in the solution as:

0.000139 moles NaCl / 0.1000 L = 0.00139 M NaCl

Therefore, the molar concentration of NaCl in the normal saline solution is 0.00139 M.

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Answer:

Her speed is 6.8m/s.

Explanation:

K.E= 1/2mv²

or, 2543.2= 1/2×110×v²

or, 2543.2 = 55v²

or, 2543.2/55 = v²

or, 46.24 = v²

or, 6.8² = v²

v = 6.8 m/s

answer

6.8

explanation

k.e=1/2v^2

2543.2=55v^2

46.24=v^2

6.8^2=v^2

v=6.8

The pH of a 0.103 M solution of formic acid is 2.26.

The balanced chemical equation for the dissociation of formic acid in water is:

\(HCOOH + H_2O = H_3O^+ + HCOO^-\)

The equilibrium constant expression for this reaction is:

\(Ka = [H_3O^+][HCOO^-]/[HCOOH]\)

We also know that the dissociation constant of the conjugate base (\(HCOO^-\)) is related to the acid dissociation constant (Ka) by:

Kb = Kw/Ka

where Kw is the ion product constant of water (1.0x10^-14 at 25°C).

The pKa and pKb values for formic acid and formate ion, respectively, are provided on the equation sheet:

pKa(HCOOH) = 3.75

pKb(\(HCOO^-\)) = 10.25

Using these values, we can calculate the equilibrium concentrations of \(H_3O^+\) and \(HCOO^-\) in a 0.103 M solution of formic acid.

First, we can calculate Ka from the pKa value:

\(Ka = 10^{-pKa} = 10^{-3.75} = 1.78*10^{-4}\)

Then, we can use Kb to calculate the equilibrium concentration of \(HCOO^-\):

Kb = Kw/Ka = 1.0x10^-14/1.78x10^-4 = 5.62x10^-11

\([HCOO^-] = \sqrt{(Kb*[HCOOH])} \\\= \sqrt{(5.62*10^{-11}*0.103)} = 3.34*10^{-6} M\)

\([H_3O^+] = Ka*[HCOOH]/[HCOO^-] \\= 1.78*10^{-4}*0.103/3.34*10^{-6} = 5.5*10^{-3} M\)

Finally, we can calculate the pH of the solution:

\(pH = -log[H_3O^+] \\= -log(5.5*10^{-3}) = 2.26\)

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Answer:

D i belive

Explanation: