draw the structures of all monobromo derivatives of 2-methylpentane, c6h13br, which have the bromine on a tertiary carbon.

Answer:

The specific heat of the sample unknown metal is approximately 0.45 J/g °C.

General Formulas and Concepts:
Thermodynamics

Specific Heat Formula: \(\displaystyle q = mc \triangle T\)

Explanation:

Step 1: Define

Identify variables.

m = 112 g

ΔT = 20.0 °C

q = 1004 J

Step 2: Solve for c

∴ specific heat capacity c is equal to around 0.45 J/g °C.

---

Topic: AP Chemistry

Unit: Thermodynamics

Answer:

When 40 cm³ of carbon monoxide reacts with 40 cm³ of oxygen, the balanced chemical equation is:

2CO + O₂ → 2CO₂

According to the stoichiometry of the reaction, two moles of carbon monoxide react with one mole of oxygen to produce two moles of carbon dioxide. Since the volume of gases is directly proportional to the number of moles at the same temperature and pressure, 40 cm³ of carbon monoxide will react completely with 20 cm³ of oxygen to produce 40 cm³ of carbon dioxide. The remaining 20 cm³ of oxygen will be in excess and not participate in the reaction.

Explanation:

The balanced chemical equation for the reaction between carbon monoxide and oxygen is:

2CO + \(O_{2}\) →2\(CO_{2}\)

From this equation, we can see that for every 2 moles of carbon monoxide reacted, 2 moles of carbon dioxide are produced. Therefore, we need to find out how many moles of carbon monoxide and oxygen we have and use that information to determine how many moles of carbon dioxide will be produced.

To do this, we can use the ideal gas law:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature.

Assuming that the pressure and temperature are constant, we can rearrange the ideal gas law to solve for the number of moles:

n = PV/RT

Let's start by finding the number of moles of carbon monoxide:

nCO = (40 \(cm^{3}\))(1 atm)/(22.4 L/mol)(273 K) = 0.0015 mol

We can do the same for oxygen: nO2 = (40 \(cm^{3}\))(1 atm)/(22.4 L/mol)(273 K) = 0.0015 mol

Since the reaction requires 2 moles of carbon monoxide for every mole of oxygen, we have a limiting reactant situation. This means that all of the oxygen will be used up before all of the carbon monoxide is reacted. Therefore, we can use the number of moles of oxygen to determine how many moles of carbon dioxide will be produced:

n\(CO_{2}\) = (n\(O_{2}\)/2) = (0.0015 mol/2) = 0.00075 mol

Finally, we can use the ideal gas law again to convert the number of moles of carbon dioxide to a volume:

V\(CO_{2}\) = n\(CO_{2}\)(RT/P) = (0.00075 mol)(22.4 L/mol)(273 K)/(1 atm) = 0.045 L or 45\(cm^{3}\)

Therefore, when 40\(cm^{3}\) of carbon monoxide is reacted with 40\(cm^{3}\) of oxygen, 45\(cm^{3}\) of carbon dioxide is produced, assuming all volumes are measured at the same temperature and pressure.

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The total charge that flows while the battery is being charged is approximately 193,939.39 Coulombs.

To calculate the total charge that flows while the battery is being charged, we can use the relationship between electrical energy, potential difference, and charge.

The electrical energy (E) stored in the battery is given as 64 mega Jules (64 MJ). The potential difference (V) provided by the battery is 330 volts. We know that the energy (E) is equal to the product of the potential difference (V) and the charge (Q):

E = V * Q

Since the charging process is 100% efficient, all the electrical energy supplied is stored in the battery. Therefore, we can rearrange the equation to solve for the charge (Q):

Q = E / V

Substituting the given values, we have:

Q = 64 MJ / 330 V

To perform the calculation, we need to convert mega Jules (MJ) to joules (J) since the SI unit of energy is joules. One mega Joule is equal to 1 million joules:

Q = (64 * 10^6 J) / 330 V

Calculating the division:

Q ≈ 193,939.39 Coulombs

Therefore, the total charge that flows while the battery is being charged is approximately 193,939.39 Coulombs.

This value represents the quantity of electric charge transferred during the charging process, and it indicates the amount of electricity that enters the battery.

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233 day are required for the amount of methyl mercury to drop to 10% of the original value after accidental ingestion.

An organometallic cation with the formulation [CH3Hg]+ is methylmercury. The simplest organisers  compound is this 1. Because of its highest toxicity, methylmercury is the main source of organic mercury for humans. It is an environmentally harmful bioaccumulative substance's.

For a first order reactions, (1/2)number of half-lives = the decimal amount remaining

Remaining amounts of methylmercury = 0.10

(½)n = 0.10; n = number of half-life

n log1/2 = log 0.10

n = -1/-0.3010 = 3.32

days required is  = 3.32 time

The  half life = 3.32 x 70 = 233 day.

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Answer:

There's only one electron in hydrogen.

Answer:

Hydrogen contain 1 electron

Explanation:

Answer:

d. Methanol is more acidic than the alkyne and will be deprotonated instead.

Explanation:

because acidity is the ability to lose H+, leaving an anion behind; acidity depends on the stability of the anion.

yes ions add another atom

ions are electrically charged particles that can be created by either taking electrons away from neutral atoms to form positive ions or adding electrons to neutral atoms to produce negative ions. The quantity of protons remains constant during the formation of an ion.

Ionic bonds are defined as connections between atoms in which electrons are primarily transported from one atom to another. Since there is always some electron sharing between atoms, we say largely because the sharing in ionic bonds is relatively uneven. The bond has a stronger ionic character the more unequally the electrons are shared.

Between a metal and a non-metal, ionic bonding form. Ionic bonds, as opposed to covalent ones, involve the transfer of valence electrons between atoms.

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yes Ions can be combined with other atoms to create new elements or compounds.

However not all ions are atoms, an atom can be an ion.

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An action potential in a ventricular cardiocyte starts with the opening of voltage-gated Na+ channels, allowing an influx of Na+ ions and causing more Na+ channels to open, leading to depolarization.

As the membrane potential reaches +30mV, Na+ channels close. Slow calcium channels then open, allowing Ca2+ to enter and create a plateau.

After the plateau, Ca2+ channels close, and K+ channels open, causing repolarization.

In summary, the order of events in an action potential in a ventricular cardiocyte is: (1) Voltage-gated Na+ channels open, (2) influx of Na+ causes more Na+ channels to open; depolarization, (3) Na+ channels close as membrane potential peaks at +30mV, (4) Ca2+ enters through slow calcium channels; creates plateau, and (5) Ca2+ channels close; K+ channels open; repolarization.

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The appropriate symbol for an isotope of potassium-39 using isotope notation would be written as "39K".

The isotope notation, also known as nuclear notation, is used to represent different isotopes of an element. It consists of the element's atomic number (Z), the element's symbol (A), and the mass number (X). The atomic number represents the number of protons in the nucleus of an atom and is used to determine the element to which an atom belongs. The mass number represents the total number of protons and neutrons in the nucleus of an atom. The symbol represents the element to which the isotope belongs.

In this case, 39 is the mass number (X) and K is the symbol of the element Potassium (A).

So, in isotope notation for Potassium-39 it would be represented as 39K.

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Answer:

advantages:

. The error due to weighing the solute can be minimised by using concentrated stock solution that requires large quantities of solute. 2. We can prepare working standards of different concentrations by diluting the stock solution which is more efficient since consistency is maintained

3. Some of the concentrated solutions are more stable and are less likely to support microbial growth than working standards used in the experiments.

0.0013% = 0.0013 g/100 ml water, or 1.3 mg/100 ml water

so for 145 mg, you need 145×100/1.3 = 11154 ml water or 11.154 L of water. Lead is a toxic metal that affects the central nervous system.

Extensively talking, the frightened gadget is organized into  essential parts, the central nervous system(CNS) and the peripheral nervous system (PNS). The CNS is the processing center of the frame and includes the mind and the spinal cord. Both of these are protected through 3 layers of membranes referred to as meninges.

The principal anxious gadget is the frame's processing center. The brain controls most of the capabilities of the frame, inclusive of cognizance, movement, thinking, speech, and the five senses of seeing, listening to, feeling, tasting and smelling. The spinal twine is an extension of the mind.

The brain is what controls all the frame's features. The spinal twine runs from the brain down via the again. It carries threadlike nerves that department out to each organ and frame part. This network of nerves relays messages from side to side from the mind to distinctive parts of the body.

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In order for the potted bean plant placed in a dark closet for five days to maintain homeostasis, the will use stored energy to stay alive.

The correct option is D.

Homeostasis is the stable internal, external, and chemical state that living systems preserve.

It involves numerous factors, including maintaining the body's temperature and fluid balance within certain predetermined parameters, in order for the organism to function at its best.

In the case of the potted bean plant kept in the dark, it will not be able to make new sugars, hence it will use stored sugars to maintain homeostasis.

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The unreacted carboxylic acid and the catalyst (concentrated sulfuric acid) that are dissolved in the organic layer are neutralised by sodium bicarbonate.

Basic aqueous solutions of saturated sodium bicarbonate (NaHCO3) and sodium carbonate (Na2CO3) are used to neutralise an organic layer that may contain trace acidic components.
To extract the ester, add sodium bicarbonate to the solution to remove the remaining acid from the catalyst; also add water so that the hydroxyl end of the alcohol reacts with the hydrogen bonding of the water.
To begin, sodium carbonate would aid in the removal of all acidic impurities present in the reaction mixture. The formation of carbon dioxide by the addition of sodium carbonate indicates the presence of any acidic impurity, typically sulfuric acid.

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To prepare 128.2ml of a 0.364 M aqueous solution of NaCl.the mass in grams, of NaCl need to use to make the solution is 2.723 gm.

Molarity is defined as the no. of moles of solute per liter of solution.

Here,

Molarity =  moles of solute / Liter of solution

0.36 M solution will contains 0.364 moles of NaCl.

therefore, volume of solution in L =  ( 128.2 / 1000 ) L × 1 L

                                                 = 0.1282 L

that means, it will contain, no. of moles of NaCl

= (0.1282 L of solution × 0.364 ) / 1 L of solution      

= 0.0466 moles of NaCl

now, molar mass of NaCl  = 58.44 g/mol    

so, 1 mol of NaCl has a mass of  58.44 g/mol

therefore, 0.0466 moles of NaCl will have mass of

= ( 0.0466 moles of NaCl × 58.44 g ) / 1 mole of NaCl

= 2.723 g

Thus,To prepare 128.2ml of a 0.364 M aqueous solution of NaCl .the mass in grams, of NaCl need to use to make the solution is 2.723 gm.

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Answer: CaCO3 reaction.

Explanation: CaO and  combine together to result in the formation of calcium carbonate compound. we know it is a synthesis reaction.so we can conclude that the most likely products of Cao + co2 → CaCO3 reaction.

Answer:

Galena

Explanation:

Galena is also known as lead glance. This is a natural mineral of the form lead(II) sulfide. It is one of the most important ore for lead. It is widely found and is mainly distributed in sulfide minerals.

Galena can be easily scratched by finger nails. It has black streak and have a metallic luster. Galena have cleavage. It usually occurs as cubic crystals.

Absorbance and transmittance are two methods used to measure the concentration of a solution. When light is passed through a solution, it can either be absorbed by the solution or transmitted through it.

The relationship between absorbance and transmittance is described by the Beer-Lambert Law, which states that the absorbance of a solution is directly proportional to the concentration of the solute present and the path length of the light through the solution.The equation for the Beer-Lambert Law is A = εbc, where A is the absorbance of the solution, ε is the molar absorptivity (a measure of how strongly a compound absorbs light of a particular wavelength), b is the path length of the light through the solution, and c is the concentration of the solute in the solution. Transmittance is the amount of light that passes through the solution and is given by the equation T = I/I₀, where I is the intensity of light transmitted through the solution and I₀ is the intensity of the incident light.The relationship between absorbance and transmittance can be expressed as follows:A = -log T, where A is the absorbance and T is the transmittance. This relationship shows that as the transmittance of a solution decreases, the absorbance of the solution increases, and vice versa. The absorbance and transmittance of a solution are inversely proportional to each other. As one increases, the other decreases, and vice versa. This relationship can be used to determine the concentration of a solute in a solution by measuring either the absorbance or the transmittance of the solution and using the Beer-Lambert Law to calculate the concentration.

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Answer:

d). gas

Explanation:

hope this helps

Answer:

three atoms = 1 water molecule

3 × 6 = 18 atoms

................

Answer:

4

Explanation:

Answer:

B.

Explanation:

I don't know much about this subject, but it seems that a wave is when the line is above the line in the middle.

Ca₃(PO₄)₂ contains 13 atoms in one formula unit.

To determine the number of atoms in one formula unit of Ca₃(PO₄)₂, we need to count the individual atoms present in the compound.

The formula Ca₃(PO₄)₂ indicates that there are three calcium (Ca) atoms, two phosphate (PO₄) groups, and a total of eight oxygen (O) atoms. To find the number of atoms, we sum up the counts for each element.

Calcium (Ca): 3 atoms

Phosphorus (P): 1 atom in each PO₄ group, so a total of 2 atoms

Oxygen (O): Each PO₄ group contains four oxygen atoms, so a total of 8 atoms

Adding up the counts for each element, we have:

3 Ca atoms + 2 P atoms + 8 O atoms = 13 atoms

Therefore, there are 13 atoms in one formula unit of Ca₃(PO₄)₂.

It's important to note that the number of atoms can vary depending on the compound and its chemical formula. In this case, Ca₃(PO₄)₂ contains 13 atoms in one formula unit.

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When using a water-cooled condenser, the water should constantly move over the condenser. to make this happen, the water should flow in at the bottom part and should flow out at the top part.

Water cooled condenser is heat exchanger. it will removes heat from the refringent and transfer to the water running through. The advantages of this system is it is lasts year longer. it has higher heat transfer rate

Thus, When using a water-cooled condenser, the water should constantly move over the condenser. to make this happen, the water should flow in at the bottom part and should flow out at the top part.

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Reaction rates decline with time because as the reaction progresses, the concentration of reactants decreases and the concentration of products increases. This means that there are fewer reactant molecules available to collide and react with each other, leading to a slower rate of reaction.

Additionally, the reaction may reach a state of equilibrium where the rate of the forward reaction is equal to the rate of the reverse reaction, resulting in no net change in concentrations of reactants and products over time.

To correctly process data for a reaction with declining rates, it is important to choose data points that reflect the initial, fast reaction rate before significant amounts of reactants have been consumed.

These points can be used to calculate the reaction rate constant and determine the order of the reaction. Using data points from later times when the reaction rate has slowed down may lead to incorrect calculations of the reaction rate and order.

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Prior to giving nitroglycerin, an additional diagnostic test that is often indicated is an electrocardiogram (ECG/EKG).

An electrocardiogram (ECG or EKG) is a diagnostic test that measures the electrical activity of the heart. It is a non-invasive procedure that involves attaching electrodes to the patient's chest, arms, and legs to detect and record the electrical signals produced by the heart.

During an ECG, the electrodes detect the electrical impulses generated by the heart's natural pacemaker, the sinoatrial (SA) node, and the subsequent conduction of these impulses through the heart. The electrical activity is then recorded as a series of waveforms on a graph, which can be interpreted by a healthcare professional.

The ECG provides valuable information about the heart's rhythm, rate, and overall electrical conduction. It helps in diagnosing various cardiac conditions, including abnormal heart rhythms (arrhythmias), heart attacks (myocardial infarction), ischemia (lack of blood flow to the heart), and structural abnormalities.

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The question is incomplete, the complete question is;

A student investigated some properties of lead and recorded the findings in the table below. Property Observation Color Dull gray Density 11.3 g/cm3 Volume of sample 3 cm3 Melting point 327°C Reaction with air Lead oxide forms on the surface Electrical conductivity Conducts some electricity Which statement is true with respect to the investigation?

A. The student investigated only the physical properties of lead.  

B. The student investigated only the chemical properties of lead.  

C. The student investigated more physical properties than chemical properties of lead.  

D. The student investigated more chemical properties than physical properties of lead.

Answer:

The student investigated more physical properties than chemical properties of lead.

Explanation:

If we look at the things mentioned in the question as regards the approach of the student towards the study of lead, we will discover that he/studied;

Colour, density, volume, melting point and electrical conductivity which are all physical properties. Physical properties of a substance does not involve chemical reactions of the substance under study.

The only chemical property studied by the student is its formation of an oxide- lead oxide with air as follows;

2Pb(s) + O₂(g) → 2PbO(s)

Thus we can safely conclude that; the student investigated more physical properties than chemical properties of lead.

Answer:

c

Explanation:

edge 2021 :)

The volume of 3.5 mol of an ideal gas at a pressure of 3 atm and at temperature of 0°C is 26.227 L

The volume of the ideal gas can be solved using the ideal gas equation of state:

PV=nRT

Where

p is the gas pressure

V is its volume

n is the number of moles

R is the gas constant

T is the absolute temperature of the gas

For the ideal gas of this problem:

n = 3.5 mol (number of moles)

p = 3 atmospheres (pressure)

T = 0°C= 0+273°K =273 °K

R= the gas constant = 0.082Latm/mol °K

Solving for V gives the volume of the gas.

V= nRT

      P

V = 3.5 mol x 0.082Latm/mol °K x 273 °K

                              3 atm

V =  26.227 L

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Answer

3.075 g Fe²⁺

Procedure

The formula of iron (II) sulfite is FeS, to get the grams of Fe²⁺ present, we need to determine the ratio of the elements that form the molecule.

Fe = 55.845 g/mol

S = 32.065 g/mol

FeS = 55.845 g/mol + 32.065 g/mol = 87.91 g/mol

Ratio Fe = 55.845/87.91= 0.6353

Ratio S= 32.065/89.91 = 0.3647

Grams of Fe²⁺ = 4.84 (0.6353) = 3.075 g Fe²⁺

Out of the given options, the combination that would dissolve a solid solute the fastest is high temperature with stirring.

A substance that is dissolved in a solvent to make a solution is called a solute.

A solution is a homogeneous mixture composed of a solute dissolved in a solvent.

Solubility is the capacity of one substance to dissolve in another substance. Factors such as temperature, pressure, and the solvent's chemical structure influence solubility.

Therefore, it can be inferred that out of the given options, the combination that would dissolve a solid solute the fastest is high temperature with stirring. High temperature helps to dissolve the solid solute by increasing the kinetic energy of the molecules. Stirring ensures the solute is evenly dispersed in the solvent and provides a fresh surface for the solvent to attack.

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