the substance to which the sample is bound at the start of an experiment

Answer:

1 is the chemical formula for water, meaning that each of its molecules contains one oxygen and two hydrogen atoms.

2 a colorless, odorless gas produced by burning carbon and organic compounds and by respiration. It is naturally present in air (about 0.03 percent) and is absorbed by plants in photosynthesis.

3 Chemical abbreviation for sodium chloride (table salt)

Answer:

394.68 J

Explanation:

The amount of heat gained or lost by an object when its temperature changes can be calculated by using the formula:

\(\boxed{\sf c = \dfrac{Q}{m \cdot \Delta T}}\)

where:

The initial temperature of the marble was 22°C and its final temperature is 45°C. Therefore, the change in temperature, ΔT, is:

\(\implies \sf \Delta T=45^{\circ}C-22^{\circ}C=23^{\circ}C\)

Therefore, the values to substitute into the formula are:

Substitute these values into the formula:

\(\implies \sf \dfrac{0.858\;J}{g \cdot \!\!\!\!\phantom{2}^{\circ}C}}=\dfrac{Q}{20.0\;g \cdot 23 ^{\circ}C}\)

\(\implies \sf Q=\dfrac{0.858\;J \cdot 20.0\;g \cdot 23^{\circ}C}{g \cdot \!\!\!\!\phantom{2}^{\circ}C}}\)

\(\implies \sf Q=0.858\;J \cdot 20.0 \cdot 23\)

\(\implies \sf Q=394.68\;J\)

Therefore, 394.68 J of heat is required to raise the temperature of 20.0 g of marble from 22°C to 45°C.

\(\blue{\huge {\mathrm{SPECIFIC \; HEAT \; CAPACITY}}}\)

\(\\\)

\({===========================================}\)

\({\underline{\huge \mathbb{Q} {\large \mathrm {UESTION : }}}}\)

\({===========================================}\)

\( {\underline{\huge \mathbb{A} {\large \mathrm {NSWER : }}}} \)

\({===========================================}\)

\({\underline{\huge \mathbb{S} {\large \mathrm {OLUTION : }}}}\)

The formula for calculating the amount of heat required to raise the temperature of an object is:

where

Using the given values, we can plug them into the formula:

\(\begin{aligned}\sf Q& =\sf 20.0\: g \cdot 0.858\: J/g^{\circ}C \cdot (45^{\circ}C - 22^{\circ}C)\\& =\sf 20.0\: g \cdot 0.858\: J/g^{\circ}C \cdot 23^{\circ}C \\& = \boxed{\bold{394.68\: J}}\end{aligned}\)

Therefore, the amount of heat required to raise the temperature of 20.0 g of marble from 22°C to 45°C is 394.68 Joules.

\({===========================================}\)

\(- \large\sf\copyright \: \large\tt{AriesLaveau}\large\qquad\qquad\qquad\qquad\qquad\qquad\qquad\tt 04/02/2023\)

Answer:

Answer above is incorrect

Explanation:

The true answers are B and E on Edge 2020

Hope this helps :)

Answer:

B and E

Explanation:

on edge hope this helps

Answer: You can do this by using ph strips. It should determine which is a salt base and an acid!

Answer:

2

Explanation:i did the test

The volume of a gas at 6.0 atm is 2.5 L. What is the volume of the gas at 7.5 atm at

the same temperature? (5 points)

1) 1.0 L

2) 1.5 L

3) 2.0 L

4) 3.0L

Answer:

2.0 L

Option C) 2.0L is the correct answer.

Hence, at the same temperature, as the pressure is increased to the given value, the volume of the gas decreases to 2.0L.

Boyle's law

Boyle's law states that "the volume V of a given quantity of gas is inversely proportional to its pressure P as long as temperature remains constant.

Boyle's law is expressed as;

P₁V₁ = P₂V₂

Given the data in the question;

To determine the final volume of the gas, we substitute our given values into the expression above.

P₁V₁ = P₂V₂

V₂ = P₁V₁ /  P₂

V₂ = ( 6.0atm × 2.5L ) /  7.5atm

V₂ = 15Latm / 7.5atm

V₂ = 2.0L

Option C) 2.0L is the correct answer.

Hence, at the same temperature, as the pressure is increased to the given value, the volume of the gas decreases to 2.0L.

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Answer:

The new pressure becomes one third of the initial pressure.

Explanation:

The relation between pressure and volume at constant temperature is given by :

\(P\propto \dfrac{1}{V}\\\\P=\dfrac{1}{V}\)

Let new pressure and volume be P' and V' respectively.

V'=3V (given)

So,

\(P'=\dfrac{1}{V'}\\\\=\dfrac{1}{3V}\\\\=\dfrac{1}{3}\times \dfrac{1}{V}\\\\P'=\dfrac{1}{3}\times P\)

Hence, new pressure becomes one third of the initial pressure.

The correct ranking of compounds in order of increasing keq for this equilibrium is Acetone < Propanone < Benzaldehyde.

The correct ranking of compounds in order of increasing keq for the equilibrium of each of the carbonyl compounds with HCN to produce cyanohydrins is

Acetone < Propanone < Benzaldehyde.

In the above reaction, the cyanide ion acts as a nucleophile and attacks the carbonyl carbon atom in the carbonyl compound to form an intermediate compound. Then the intermediate compound formed by the reaction between HCN and the carbonyl compound undergoes an intramolecular rearrangement to form cyanohydrin.Based on the stability of intermediate compound formed, the order of increasing stability is as follows:

Acetone < Propanone < Benzaldehyde.

Since the keq is directly proportional to the stability of the intermediate, the order of increasing keq for the equilibrium of each of the carbonyl compounds with HCN to produce cyanohydrins is

Acetone < Propanone < Benzaldehyde.

The correct ranking of compounds in order of increasing keq for this equilibrium is

Acetone < Propanone < Benzaldehyde.

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The amount of fluoride (in milligrams) is present in a 100 mg sample of bone with this fluoride concentration is 7mg per 100mg.

In this systematic review investigation, the necessary information was gathered by searching PubMed, ScienceDirect, IranMedex, SID, MEDLIB, and Magiran databases using the terms drinking water fluoride, fluoride concentration, fluorosis, dent*, Iran*, and their Persian equivalents. After removing the remaining publications that were unrelated to the study's aims, 29 articles out of 617 were ultimately taken into consideration. The pertinent data were carefully examined and extracted, and then they were compiled in extraction tables and manually examined. The diagrams were created using the Excel 2007 programme.

In 29 papers, the fluoride contents of drinking water were determined using 4434 samples of surface, ground, and tap water resources that were gathered over the course of 236 months across all seasons in 17 regions of Iran. An average fluoride concentration of 0.43 0.17 ppm was calculated, with zero and 3.06 serving as the minimum and maximum values. Tap water has the lowest concentration. Only three provinces had fluoride concentrations that met the international standard. Estimates place the frequency of fluorosis at 61%, with just 1% of cases being considered severe.

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Complete question:

Fluoride lon in Drinking Water Sodium fluoride is added to drinking water in many municipalities to protect teeth against cavities. The target of the fluoridation is hydroxyapatite,

a compound in tooth enamel. There is concern, however, that fluoride ions in water may contribute to skeletal fluorosis, an arthritis-like disease.

a. Write a net ionic equation for the reaction between hydroxyapatite and sodium fluoride that produces fluorapatite,

b. The EPA currently restricts the concentration of

in drinking water to

. Express this concentration of

in molarity.

c. One study of skeletal fluorosis suggests that drinking water with a fluoride concentration of

for

20 years raises the fluoride content in bone to

, a level at which a patient may experience stiff joints and other symptoms. How much fluoride (in milligrams) is present in a 100 mg sample of bone with this fluoride concentration?

None of the elements have the same electron arrangement as neon.

Neon (Ne) has a stable electron arrangement with a full outer shell of electrons. It belongs to the noble gas group, which means its outermost energy level (valence shell) contains a total of 8 electrons, making it chemically inert. This arrangement is known as a "closed shell" or "octet configuration." No other element in the periodic table has the exact electron arrangement as neon, as each element has a unique number of electrons and different electronic configurations.

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Compound that would have the highest boiling point is c) CH₃CH₂CH₂CH₂CH₂OH.

Pentan-1-ol (CH₃CH₂CH₂CH₂CH₂OH) is an alcohol with boiling point of 137⁰C.

While boiling, liquid pentan-1-ol is changed into gaseous pentan-1-ol.

Alcohols have higher boiling point than ethers, because it can form hydrogen bonds (see the picture below).

Between molecules of water there are hydrogen bonds, which must be brake so water can evaporate.

Hydrogen bond is an electrostatic attraction between two polar groups in which one group has hydrogen atom (H) and another group has highly electronegative atom such as nitrogen (like in this molecule), oxygen (O) or fluorine (F).

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According to Laplace's Law, during inhalation, the alveoli should remain inflated because the pressure inside of the alveoli is greater than atmospheric pressure.

This law states that the pressure inside a spherical structure, like an alveolus, is directly proportional to its surface tension and inversely proportional to its radius. Therefore, smaller alveoli with higher surface tension would require greater pressure to remain inflated. In contrast, larger alveoli have lower surface tension and therefore require less pressure to remain inflated. This helps to optimize gas exchange in the lungs by preventing collapse of the alveoli during inhalation. So, to summarize, according to Laplace's Law, the alveoli should remain inflated because the pressure inside of the alveoli is greater than atmospheric pressure, promoting efficient gas exchange.

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Answer:

9.90

Explanation:

Given [H+] = 1.25 x 10^-10 M, we can calculate the pH using the formula:

pH = -log10([H+])

pH = -log10(1.25 x 10^-10)

Using logarithmic properties:

pH = -log10(1.25) - log10(10^-10)

Since log10(10^-10) is equal to -10:

pH = -log10(1.25) - (-10)

pH = -log10(1.25) + 10

Now, evaluating the logarithm using a calculator:

pH = -0.0969 + 10

pH = 9.9031

Therefore, the pH of the solution with [H+] = 1.25 x 10^-10 M is approximately 9.9031. Rounding it to two decimal places, the pH is approximately 9.90.

Answer:

45 minutes about

Explanation:

i think because i have 7 periods with 45 minutes each

Answer:

1.78 g/L

Explanation:

Answer:

The correct answer to this question is a prokaryotic cell.

Explanation:

Prokaryotes have circular DNA and a cell wall, whereas eukaryotes have their DNA packaged into chromosomes and may not have a cell wall (as is the case in animal cells).

Hope this helps!

Based on the given information, the true statement about the time indicated by the blue arrow is: (c) The rate of the forward reaction (N₂O₄ formation) is equal to the rate of the reverse reaction (NO₂ formation).

The graph shows the relative amounts of NO₂ and N₂O₄ over time, and the point indicated by the blue arrow represents a state of equilibrium. In an equilibrium state, the forward and reverse reactions occur at equal rates.

The concentrations of NO₂ and N₂O₄ reach a constant value, indicating that the conversion of NO₂ to N₂O₄ and the conversion of N₂O₄ to NO₂ are occurring at the same rate.

Option a suggests that NO₂ molecules are no longer reacting, which is incorrect as the reaction is still ongoing at equilibrium. Option b suggests that the reactant has been completely used up, which is not the case in an equilibrium state. Option d refers to the activation energy, which is unrelated to the equilibrium state. Therefore, option c is the correct choice.

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Answer:

To calculate the mass of the sample, we can use the formula:

mass = density x volume

Given that the density of pure silicon is 2.34 g/cm^3 and the volume is 450 mL, we can plug in these values:

mass = 2.34 g/cm^3 x 450 mL

Before we can multiply, we need to convert mL to cm^3 since the units need to match:

1 mL = 1 cm^3

So:

mass = 2.34 g/cm^3 x 450 cm^3

Now we can multiply:

mass = 1053 g

Therefore, the mass of the sample of pure silicon is 1.053 x 10^3 g, or 1.053 kg, with three significant figures.

Explanation:

573,213 Joules of energy is required to raise the temperature of the hydrogen gas from 0.0°C to 30.5°C.

To calculate the energy required to raise the temperature of the hydrogen gas, we can use the equation:

ΔE = n * Cv * ΔT

where:

ΔE is the change in energy,

n is the number of moles of gas,

Cv is the molar heat capacity at constant volume,

ΔT is the change in temperature.

First, we need to calculate the number of moles of hydrogen gas using the ideal gas law:

PV = nRT

where:

P is the pressure,

V is the volume,

n is the number of moles,

R is the ideal gas constant,

T is the temperature.

Rearranging the equation, we have:

n = PV / RT

Given:

P = 10.0 atm

V = 239 L

R = 8.314 J/(mol·K)

T1 = 0.0°C = 273.15 K (convert to Kelvin)

T2 = 30.5°C = 303.65 K (convert to Kelvin)

Cv = 20.4 J/(mol·K)

Now, let's calculate the number of moles of hydrogen gas:

n = (10.0 atm * 239 L) / (8.314 J/(mol·K) * 273.15 K)

n ≈ 92.05 moles

Next, we can calculate the change in energy using the equation mentioned earlier:

ΔE = n * Cv * ΔT

ΔE = 92.05 moles * 20.4 J/(mol·K) * (303.65 K - 273.15 K)

Calculating this expression will give us the energy required to raise the temperature of the hydrogen gas.

ΔE ≈ 573,213 J

Therefore, approximately 573,213 Joules of energy is required to raise the temperature of the hydrogen gas from 0.0°C to 30.5°C.

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The pH of a saturated solution of a metal hydroxide M(OH)3 with a Ksp of 4.5e-15 is approximately 13.

The pH of a saturated solution of a metal hydroxide can be determined by the concentration of hydroxide ions (OH-) in the solution. Since M(OH)3 is a strong base, it completely dissociates in water, releasing three hydroxide ions for every M(OH)3 molecule. The Ksp value of 4.5e-15 indicates that the concentration of hydroxide ions is very low, suggesting that the solution is highly basic.

In water, hydroxide ions react with water molecules to produce hydroxide ions and hydroxide ions. The equilibrium constant for this reaction, known as the Kw, is 1.0e-14 at 25°C. Since the concentration of hydroxide ions is much higher than the concentration of hydronium ions (H3O+), the solution is strongly basic, resulting in a pH of approximately 13.

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0.1 moles of strong base per liter would need to sodium acetate be added to increase the pH by one unit.

To decide the number of moles of solid base that would should be added per liter to expand the pH by one unit, we really want to initially compute the underlying pH of the cradle arrangement.

Utilizing the Henderson-Hasselbalch condition:

pH = pKa + log([Acetate]/[Acetic acid])

We realize that the cushion has a pKa of 4.76, [Acetic acid] = 0.2 M, and [Acetate] = 0.3 M. Connecting these qualities to the situation, we get:

pH = 4.76 + log(0.3/0.2) = 4.94

Presently, to expand the pH by one unit, we want to add serious areas of strength for sufficient to switch half of the acidic corrosive over completely to acetic acid derivation particle, as indicated by the Henderson-Hasselbalch condition. This will bring about another cradle with [Acetic acid] = 0.1 M and [Acetate] = 0.4 M.

How much solid base expected to accomplish this can be determined utilizing the condition:

moles of solid base = (0.1/0.5)-0.2 = - 0.1 M

Here, we have deducted the underlying centralization of acidic corrosive from the last fixation to decide its amount should be switched over completely to acetic acid derivation particle. The negative sign demonstrates that we want to add a base to the cushion arrangement.

Hence, to expand the pH by one unit in this cushion arrangement, we would have to add 0.1 moles of a solid base (like NaOH) per liter.

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The valence shell electrons in a molecule are depicted in an extremely simplified manner by a Lewis Structure. It is used to demonstrate how the electrons in a molecule are positioned around particular atoms. Electrons are shown as "dots" or, in the case of a bond, as a line connecting the two atoms.

The significance of Lewis's structure is the second. For forecasting the geometry, polarity, and reactivity of (in)organic compounds, Lewis structures are crucial. Lastly, how to depict the Lewis structure. For each available valence electron, a dot is placed around an atom to represent that electron in the Lewis structure for that particular element.

Conclusion. A Lewis structure is created using the octet rule, which states that atoms must share electrons in order for each to have eight electrons in its outer shell. Typically, a symbol on the side of an element symbol designates a single electron.

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There are more endothermic or exothermic reactions, since the predominance of each kind of reaction varies according to the system or process under consideration.

Endothermic and exothermic reactions are both widespread in nature and in industrial operations. Exothermic processes, for example, are those that release energy in the form of heat and light. Certain chemical processes, however, absorb energy and are hence endothermic, such as the breakdown of calcium carbonate to generate calcium oxide and carbon dioxide. Many biological responses are either endothermic or exothermic. Exothermic activities include the hydrolysis of ATP (adenosine triphosphate) to release energy for cellular operations, whereas endothermic processes include photosynthesis, which turns light energy into chemical energy in plants.

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