Please help!! This is for chem!!!

Answer:

The reactants are on the left of the arrow, the products are on the right.

Explanation:

Reactants are the substances that exist before the chemical reaction takes place. When writing a chemical reaction or equation, they are found on the left of the arrow. They react to form new substances, which are known as the products. The products are found to the right of the arrow in the reaction.

The statement is False.

Ethanol is one of many toxic substances found in tobacco smoke.

Ethanol is used in the manufacture of drugs, plastics, lacquers, polishes, plasticizers, and cosmetics. Ethanol is utilized in remedy as a topical antiinfective, and as an antidote for ethylene glycol or methanol overdose.

Ethanol is a natural chemical compound. it's far simple alcohol with the chemical formula C₂H₆O. Its system can be additionally written as CH ₃−CH ₂−OH or C ₂H ₅OH and is frequently abbreviated as EtOH. Ethanol is a risky, flammable, colorless liquid with a characteristic wine-like smell and pungent taste.

Within the worst instances, there can also be respiratory problems, low blood strain, incontinence coronary heart troubles, blood troubles, liver damage, and loss of life. Ethanol can also dry out and worsen the skin; there may be aches, redness, and swelling. Eye publicity to ethanol also can purpose tearing, burning, and stinging.

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The minimum energy needed by the photons to react with silver bromide in the film is approximately 57.9 kJ/mol. Then, the wavelength is 206 nm.

Wavelength of a wave is the distance between two consecutive crests or troughs of the wave.

To find the wavelength of the energy in nm, we can use the equation:

E = hc/λ

where E is the energy in joules, h is Planck's constant (6.626 x 10⁻³⁴ J s), c is the speed of light (2.998 x 10⁸ m/s), and λ is the wavelength in meters.

First, we need to convert the energy from kJ/mol to J/photon:

57.9 kJ/mol = 57.9 x 1000 J/mol / 6.02 x 10²³ mol^-1

= 9.626 x 10²⁰ J/photon

Now we can use the equation above to find the wavelength:

9.626 x 10²⁰ J/photon = (6.626 x 10⁻³⁴ J s)(2.998 x 10⁸ m/s) / λ

Solving for λ, we get:

λ = hc/E = (6.626 x 10⁻³⁴ J s)(2.998 x 10^8 m/s) / 9.626 x 10⁻²⁰J/photon

  = 2.06 x 10⁻⁷ m

Finally, we convert the wavelength from meters to nanometers:

λ = 2.06 x 10⁻⁷ m x (10⁻⁹ nm/m)

  = 206 nm

Therefore, the wavelength of the energy needed to react with silver bromide in 35 mm photographic film is approximately 206 nm.

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Answer:

Explanation:

The reasons that cities boomed during the Middle Ages are more employment opportunities, increased trade, and growing interest in culture and art.

Answer:

Explanation:

By the High Middle Ages, towns were growing again. One reason for their growth was improvements in agriculture. Farmers were clearing forests and adopting better farming methods. As a result, they had a surplus of crops to sell in town markets.

Also, as the amount of trade increased between Europe and other continents. Trade began to grow in Europe after the Crusades. Most of this trade was controlled by merchants from Italy and Northern Europe.

Answer:

Explanation:    

The correct answer is option c) Methanol. Both methanol and hexanol are polar substances, and they can interact with acetone through dipole-dipole interactions since acetone is also polar. However, methanol is more soluble in acetone compared to hexanol. Here's the explanation:

Methanol has a shorter hydrocarbon chain compared to hexanol. Due to its shorter chain, the molecules of methanol have a smaller size and a greater dipole moment. This makes methanol more capable of forming stronger dipole-dipole interactions with acetone molecules.

On the other hand, hexanol has a longer hydrocarbon chain. The longer chain makes hexanol molecules larger and less polarizable compared to methanol. While hexanol can still interact with acetone through dipole-dipole interactions, the relatively weaker interactions and the tendency of hexanol molecules to interact more strongly with themselves through dispersion forces limit its solubility in acetone.

In summary, methanol, with its smaller size and stronger dipole moment, is more likely to form favorable interactions with acetone molecules and dissolve more readily in acetone compared to hexanol.

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Answer:

The correct answer is - 1:50.

Explanation:

Given:

Model toy car = 0.12 m

Actual size of car = 6 m

The ratio of model and actual car size = ?

Solution:

We know that 1 m = 100 cm

then, Model toy car - 0.12*100 = 12 cm

and size of the actual car - 6*100 - 600 cm

Then the ratio of  model and actual car size = model car size/ actual car size

= 12/600

= 1/50

Thus, the correct answer is - 1:50.

Answer:

Of what?

Explanation:

But uhh: An acid is a substance that donates protons or accepts a pair of valence electrons to form a bond. Bases can be thought of as the chemical opposite of acids.

True, an electron loses energy in the transition from a 4f subshell to a 6s subshell

Orbitals of lower energies fill up first. The pattern of filling is 1s, 2s, 2p, 3s, 3p, 4s, 3d, etc. An full subshell of a specific orbital type must be filled before going on to the next subshell with a higher energy level since all of the orbitals inside a subshell are degenerate (of equal energy).

The orbitals are filled in accordance with the (n+1) rule, which states that even if an orbit's n value is greater, the orbits with a higher (n+1) value will be filled first.

Here, the (n+1) of the 6s orbital is 6, whereas the (n+1) of the 4f orbital is 7, filling the 4f orbital before the 6s orbital.

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Answer:

wait what?

Explanation:

brainliest pls

Step 1

The reaction:

CaCO3 + heat => CaO + CO2 (completed and balanced)

-----------------------

Step 2

Information provided:

Actual yield = 0.53

Answer:

7.224 × 10^28 atoms

Explanation:

The number of moles contained in a substance (n) can be calculated from this expression:

nA = n × 6.02 × 10^23 atoms

Where;

nA = number of atoms of substance

n = number of moles of substance

Avagadro's number or constant = 6.02 × 10^23 atoms

Using nA = n × 6.02 × 10^23 atoms

In this question, there are 1.2 x 10^5 moles of neon (N). The number of atoms (nA) is as follows:

nA of neon = 1.2 x 10^5 × 6.02 × 10^23

nA = 7.224 × 10^ (5 + 23)

nA = 7.224 × 10^28 atoms

The number of neon atoms in 1.2 x 10^5 is 7.224 × 10^28 atoms.

a. ΔGrxn under the given conditions is -109 kJ. b. The reaction is more spontaneous under the given conditions than under standard conditions.

a. To calculate ΔGrxn under the given conditions, we can use the equation ΔGrxn = ΔGrxn° + RT ln(Q), where ΔGrxn° is the standard free energy change, R is the gas constant, T is the temperature in Kelvin, and Q is the reaction quotient.

Given:

ΔGrxn° = -102 kJ (standard free energy change)

P(H2S) = 2.00 atm

P(SO2) = 1.50 atm

P(H2O) = 0.0100 atm

Using the ideal gas law, we can calculate the reaction quotient:

Q = \((PH2O)^2 / (PH2S)^2 (PSO2)\)

 = \((0.0100)^2 / (2.00)^2 (1.50)\)

 = 0.000000333

Plugging the values into the equation ΔGrxn = ΔGrxn° + RT ln(Q), we get:

ΔGrxn = -102 kJ + (8.314 J/mol·K)(298 K) ln(0.000000333)

        = -109 kJ

Therefore, ΔGrxn under the given conditions is -109 kJ.

b. To determine whether the reaction is more or less spontaneous under the given conditions than under standard conditions, we compare the sign of ΔGrxn. Since ΔGrxn is negative (-109 kJ), the reaction is more spontaneous under the given conditions than under standard conditions, where ΔGrxn° is -102 kJ. A more negative value of ΔGrxn indicates a more spontaneous reaction, meaning that the reaction is more likely to occur under the given conditions than under standard conditions.

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An investigation into an unknown object in space resulted in the following observations: It was discovered to be an asteroid, It revolves around the sun, which is in the third position.

It is a small, rocky substance that rotates around the sun and is found in the asteroid belt, which is located between the orbits of Mars and Jupiter, and its size varies, with some still in fragments and others having a large structure.

Hence, an investigation into an unknown object in space resulted in the following observations: It was discovered to be an asteroid, It revolves around the sun, which is in the third position.

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Water does  not stick to the leaves of the plant  owing to the fact that the leaves has a waterproof cuticle.

We know that the leaves are the parts of the plant that are involved in photosynthesis. Photosynthesis is the process by which green plants produce their own food in the presence of sunlight and chlorophyll. We know that the leave has an outer protective covering.

The tissue that plays this outer covering of a plant for is the  epidermis and its waxy cuticle. It prevents damage to the plant.

Water does  not stick to the leaves of the plant  owing to the fact that the leaves has a waterproof cuticle.

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Within the textbook, the idea that goods would be equally distributed if the distributor was not allowed to know of his/her status or position is referred to as the veil of ignorance.

This concept, introduced by philosopher John Rawls, suggests that in a just society, individuals should make decisions about the distribution of resources and opportunities without any knowledge of their own advantages or disadvantages in that society.

The veil of ignorance serves as a thought experiment to encourage impartiality and fairness, as decision-makers would be motivated to create a system that benefits everyone, regardless of their personal circumstances, ensuring a more equitable distribution of goods.

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The two-step synthesis of cyclopentane-carboxylic acid from cyclopentanone involves the conversion of cyclopentanone into cyclopentyl sulfate using sulfuric acid as the reagent in the first step. In the second step, the leaving group is substituted by a carboxyl group using sodium or potassium cyanide as the reagent.

To synthesize cyclopentane carboxylic acid from cyclopentanone, a two-step process is typically employed. In the first step, the hydroxyl group of cyclopentanone is converted into a leaving group, which is then substituted by a carboxyl group in the second step. Here are the missing reagents and the intermediate formed for each step:

Step 1: Conversion of Cyclopentanol into a Leaving Group Intermediate
To convert cyclopentanone into a suitable leaving group, an acid is commonly used. The acid protonates the hydroxyl group, making it a better-leaving group. In this case, sulfuric acid (H2SO4) can be used as the reagent. The resulting intermediate formed is cyclopentyl sulfate.

Step 2: Substitution of the Leaving Group with a Carboxyl Group
In the second step, the leaving group (cyclopentyl sulfate) is replaced by a carboxyl group (-COOH). To achieve this, a nucleophile that can attack the sulfur atom in the intermediate is required. Sodium or potassium cyanide (NaCN or KCN) can be used as the reagent. This leads to the formation of cyclopentane-carboxylic acid, with the sulfate group replaced by the carboxyl group.

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The balanced equation is K3PO4 + 3HCl --> 3KCl + H3PO4.

In order to balance the equation, coefficients must be added to each element or molecule in the equation so that the same number of atoms of each element is present on both sides.

Starting with the potassium ions (K), there are 3 on the left side and only 1 on the right side.

Therefore, a coefficient of 3 must be added to KCl to balance the K atoms. Next, the phosphorous ion (PO4) is already balanced with 1 on each side.

Finally, looking at the hydrogen ions (H), there are 3 on the left and 1 on the right, so a coefficient of 3 must be added to HCl to balance the H atoms. This results in the balanced equation: K3PO4 + 3HCl --> 3KCl + H3PO4.

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Answer:

1.75moles

Explanation:

Molarity = number of moles (n) ÷ volume (V)

According to the information given in this question,

V = 500mL = 500/1000 = 0.500L

n = ?

Molarity = 3.5M

Using Molarity = n/V

number of moles (n) = V × molarity

n = 0.5 × 3.5

n = 1.75moles.

Answer:

3.077 × 10¹⁴ Hz

Explanation:

f = ?

wavelength = 9.75 × 10-⁷m

using the formula,

c = wavelength × frequency

f = c/wavelength

but c(speed of light) = 3×10⁸m/s

f = 3 × 10⁸/9.75 × 10-⁷

f = 3.077 × 10¹⁴ s-¹

To determine the amount of filtrate formed in 1 minute, we use the given information that 10% of renal blood flow becomes filtrate. If the renal blood flow is 1 L/min, then 10% of that is 100 ml/min.

2. To find the amount of filtrate formed in 1 hour, we multiply the filtrate formed per minute (100 ml/min) by the number of minutes in an hour (60). This gives us 6,000 ml or 6 L of filtrate formed in 1 hour.3. For the amount of filtrate formed in 1 day, we multiply the filtrate formed per minute (100 ml/min) by the number of minutes in a day (1,440). This gives us 144,000 ml or 144 L of filtrate formed in 1 day.

4. To calculate the amount of filtrate reabsorbed per day, we subtract the amount of urine formed per day from the amount of filtrate formed per day. Given that roughly 2 L of urine are formed per day, the amount of filtrate reabsorbed would be 144 L - 2 L = 142 L. 5. The purpose of forming such a large amount of filtrate can be understood in terms of kidney function. The kidneys play a vital role in maintaining homeostasis by regulating the balance of various substances in the body. The filtration process allows for the removal of waste products, excess ions, and toxins from the blood. Additionally, it allows for the selective reabsorption of essential substances back into the bloodstream, ensuring their retention and proper functioning in the body. The large amount of filtrate formed provides the kidneys with a higher chance of effectively filtering waste and maintaining appropriate levels of essential substances.

6. To calculate the amount of filtered sodium (Na+) per day, we need to consider the glomerular filtration rate (GFR) and the concentration of plasma Na+. Given that the GFR is 125 ml/min and the plasma Na+ concentration is 140 mM (millimolar), we can multiply these values to find the amount of Na+ filtered per minute. This gives us 125 ml/min * 140 mM = 17,500 millimoles of Na+ filtered per minute. To convert this to per day, we multiply by the number of minutes in a day (1,440).

Thus, the amount of Na+ filtered per day would be 17,500 millimoles/min * 1,440 min/day = 25,200,000 millimoles or 25,200 moles of Na+ per day.

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M2 refers to the money supply measure known as M2 money stock.

The FOMC's decisions and actions can impact M2 through its control over interest rates, open market operations, and the influence on economic conditions and confidence. Changes in monetary policy by the FOMC aim to manage the money supply and promote price stability, economic growth, and employment.

M2 is a broad measure of the money supply that includes cash, checking and savings deposits, money market funds, and other time deposits.

The Federal Open Market Committee (FOMC) is a committee within the U.S. Federal Reserve System that is responsible for making decisions regarding monetary policy, including setting interest rates and implementing measures to manage the money supply.

The actions taken by the FOMC can have an impact on M2 and the broader money supply in the economy. Here's how:

1. Open Market Operations: The FOMC conducts open market operations by buying or selling government securities in the open market. When the FOMC buys government securities, it injects money into the banking system, increasing bank reserves and potentially leading to an expansion of M2.

2. Interest Rate Policy: The FOMC sets the target federal funds rate, which is the interest rate at which depository institutions lend and borrow funds from each other overnight. By adjusting the federal funds rate, the FOMC influences borrowing costs for banks and, in turn, affects their lending practices. Changes in interest rates can impact the demand for loans and affect the growth of M2.

3. Impact on Confidence and Spending: The FOMC's actions and communications can influence consumer and business confidence. When the FOMC signals a more accommodative monetary policy stance, it can encourage borrowing and spending, potentially leading to an increase in the growth of M2.

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The 1,4-addition reaction between 1,3-hexadiene and Br2/CCl4 produces 1,4-dibromo-2-hexene where Br atoms add to the carbon atoms at positions 1 and 4 of the diene while the double bonds at positions 2 and 3 remain unaltered.

The reaction of 1,3-hexadiene with Br2/CCl4 undergoes 1,4-addition, also known as conjugate addition, where the electrophilic Br2 adds to the conjugate diene system. The resulting product is 1,4-dibromo-2-hexene.

The addition of Br2 to the conjugated diene takes place in such a way that the electrophilic bromine atoms add to the carbon atoms at positions 1 and 4 of the diene, which are conjugated with each other. The double bonds at positions 2 and 3 remain unchanged.

The structure of the 1,4-addition product, 1,4-dibromo-2-hexene, is:

Br Br

| |

H2C=CH-CH=CH-CH2-CH3

| |

Br H

where the Br atoms are attached to carbons 1 and 4 of the diene, and the double bonds at positions 2 and 3 remain intact.

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Answer:

d

Explanation:

because nuclear charge ( no. of protons) increases

Answer:

The answer should have as many significant figures as the lowest number used in the multiplication, which is 1.2 .

The binding energy of an atom is the amount of energy required to completely separate all its individual protons and neutrons from each other. This energy is released when an atom is formed from its individual particles and is equivalent to the mass defect of the atom. The binding energy of 11C is approximately 1.86 × 10^-11 J.


To calculate the binding energy of 11C, we need to follow these steps:
Step 1: Convert the atomic mass of 11C to energy using the mass-energy equivalence formula:
E = mc², where m is the mass, c is the speed of light (3 × 10^8 m/s), and E is the energy.
E = (1.82850 × 10^-26 kg) × (3 × 10^8 m/s)^2
E ≈ 1.64665 × 10^-11 J

Step 2: Calculate the mass defect by subtracting the sum of the masses of individual protons and neutrons from the atomic mass of 11C. There are 6 protons and 5 neutrons in 11C.
Mass defect = (11C atomic mass) - [(mass of proton × 6) + (mass of neutron × 5)]
Mass defect ≈ 1.82850 × 10^-26 kg - [(1.67262 × 10^-27 kg × 6) + (1.67493 × 10^-27 kg × 5)]
Mass defect ≈ 1.16548 × 10^-28 kg

Step 3: Convert the mass defect to energy using the mass-energy equivalence formula:
Binding energy = (1.16548 × 10^-28 kg) × (3 × 10^8 m/s)^2
Binding energy ≈ 1.86 × 10^-11 J

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Answer:

mu answer is A

Explanation:

i think it is a popular opinion because its the opinion of a country

To assemble a model of methylcyclohexane in a chair conformation, you need to replace a hydrogen atom with a methyl group and then rotate the C-C ring bonds. There are two chair conformations possible for methylcyclohexane.


1. Start by drawing a cyclohexane ring, which consists of six carbon atoms in a ring shape.
2. Choose one carbon atom on the ring to replace with a methyl group (CH3).
3. Rotate the C-C ring bonds so that you adopt a chair conformation. In a chair conformation, the ring is shaped like a chair with alternating carbon atoms above and below the plane of the ring.
4. To interconvert between chair conformations, you need to change the relative positions of the carbon atoms above and below the ring.
5. If carbon atom 1 is initially above the plane formed by carbon atoms 2, 3, 5, 6, rotate it so that it points below the plane.
6. Similarly, carbon atom 4 should move from below the plane to above the plane to perform a ring-flip.

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