500mL were removed from the solution prepared in question 1. 600 mL of water was then added to the remainder of the solution. What is the new molar concentration of this solution?

What volume of water should be added to 60g of NaCl to obtain a final concentration that is 30% (m/v) NaCl? (Density of NaCl: 2.16g/ml; Density of water 1.0g/ml)

Three parts of media are added to 4 parts of a 2.0 M solution of FeSO4 and 3 parts of a 1.0 M solution of FeSO4. What is the percentage (m/v) of FeSO4 in the final solution? (MW of FeSO4 : 151.91 g/mole)

what you need:

1 part aloe vera gel or glycerin

2 part isopropyl alcohol (rubbing alcohol) with a concentration of 91%

Essential oil, such as lemon or lavender (this is an optional ingredient for scent)

Clean containers for mixing and an air-tight container for storage

Spoon or whisk for mixing

Explanation:

step:

Combine the aloe vera gel or glycerin with the isopropyl alcohol in a clean container. To get one cup of sanitizer, combine ⅓ cup of gel or glycerin with ⅔ cup of rubbing alcohol.

Mix thoroughly with your spoon or whisk to ensure that the alcohol is evenly distributed throughout the gel.

Stir in five drops of an essential oil, if you're using it. This is entirely optional and is only meant to improve the scent of the sanitizer.

Store the sanitizer in an air-tight container. Alcohol evaporates with time, so an air-tight container will keep your sanitizer effective for longer. A pump or squeeze bottle can minimize evaporation while keeping your sanitizer easily accessible — just make sure the container for your sanitizer is clean and air-tight

The given statement "Carbon in the ocean originates from the atmosphere" is true because Carbon is one of the most vital elements on Earth and is involved in various biogeochemical cycles, including the carbon cycle.

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The correct question would be as

Carbon in the ocean originates from the atmosphere. Please select the best answer from the choices provided. True or False

Answer:

C. Compression

Explanation:

edge 2021

Compression stress force produces reverse faults. Therefore, option (C) is correct.

A fault can be described as the rupture of the earth's crust, horizontally, and a reverse fault defines as a 'dip-slip' fault moving vertically. The crust of the earth moves along faults, which are everywhere, both on land as well as on the crust under the oceans.

A reverse fault can be described as a type of dip-slip fault. These faults move vertically and the earth moves up or down relative to these faults.  are different kinds of faults, classified by how the earth on either side of the fault moves.

In a normal fault, one side of the fault slides down so when one side of the fault does go up instead of down, it is known as a reverse fault. A  special kind of reverse fault is known as a thrust fault.

Therefore, the compression stress force produces reverse faults while the tensional stress force produces normal faults.

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Answer: A. Seismic waves carry energy away from the original point of movement

Explanation: When an earthquake occurs, it is caused by the sudden release of energy in the Earth's crust, usually due to the movement of tectonic plates.  This energy travels through the Earth in the form of seismic waves.  These waves radiate outwards from the epicenter, which is the point on the Earth's surface directly above the focus, where the earthquake originates.  The seismic waves carry the energy released during the earthquake away from the original point of movement. These waves can cause the ground to shake and can be detected by seismographs.

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Answer:

Explanation:

Here, we want to get the mass of carbon (iv) oxide produced

From the question, we have the balanced chemical reaction stating that 2 moles of oxygen molecule produced 1 mole of carbon (iv) oxide molecule

The number of moles of carbon (iv) oxide produced from 7.34 mol oxygen is thus:

1 mole of carbon (iv) oxide contains 44 g

The mass in 3.67 moles will be:

1. Ammonia is a colorless gas with a chemical formula of NH3, when it comes in contact with water, it will be transformed into Ammonium ion and it will produce one hydroxide ion, and this is why Ammonia will present a more basic (pH) behavior, the reaction that represents this behavior is:

NH3 + H2O -> NH4+ + OH-

Number 4 is the only one that represents it well

Number 3 has the same reaction but since there is a plus sign instead of an arrow, I consider it wrong.

Given chemical reaction,

Glucose + Oxygen → carbon dioxide + water

Reactants : Glucose and oxygen.

Products : carbon dioxide and water.

Each chemical reaction is made up of three main components: the reactants (located on the left side of the reaction equation), the products (located on the right side of the reaction equation), and the particular reaction conditions, which are listed above or below the arrows in the middle of the reaction equation.

Combustion is one of the five fundamental types of chemical reactions, along with combination, decomposition, single-replacement, and double-replacement. You can classify a reaction into one of these groups by looking at the reactants and products of the reaction in question. It is possible for some reactions to fall into more than one category.

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Gas bubbles appear after a chemical reaction has occurred

Chemical changes occur when a substance combines with another to form a new substance. Chemical changes occur through the process of chemical reactions. The formation of a gas is the sign that a reaction may have occurred. Gas bubbles appear after a chemical reaction has occurred.

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Answer:

  Divide the energy by Planck's constant, 6.626 x 10-34, to get the frequency of the wave. Divide the speed of light, ~300,000,000 m/s, by the frequency to get wavelength.

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In 1933, the initial rock sample contained 11.29 grains of strontium-90.

The half-life of strontium is 28.8 years. Therefore,

1999 - 1943 = 56 years.

1.94 half-lives for 56 / 28.8

As a result, for each half-life that passes, the radioisotope's remaining amount will double. time-traveling backward.

The quantity left will therefore increase by 1.94 times when time is advanced by 1.94 half-lives.

Consequently, the amount left over in 1943 is

3.0 × (1.94)² = 11.29 grams

Nuclear fallout contains the radioactive element strontium-90, a byproduct of nuclear reactors. The half-life of it is 28 years.

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Answer:

72.66%

Explanation:

NH₄Cl reacts in presence of NaOH producing ammonia, NH₃, as follows:

NH₄Cl + NaOH → NaCl + NH₃ + H₂O

The residual NaOH reacts with H₂SO₄ as follows:

2NaOH + H₂SO₄ → Na₂SO₄ + 2H₂O.

The equivalent-gram of H₂SO₄ are:

16mL * 0.1N * 1.06 = 1.696mEq.

As the complete residual solution is 100mL but the neutralization was made only with 10mL, the mEq you need to neutralize the residual NaOH is:

1.696mEq * (100mL / 10mL) = 16.96mEq.

The mEq of NaOH you add in the first are:

25mL * 0.95mEq = 23.75mEq

That means the NaOH that reacts = moles of NH₄Cl is:

23.75mEq - 16.96mEq = 6.79mEq = 6.79mmoles NH₄Cl =

6.79x10⁻³ moles NH₄Cl

In grams (Using molar mass NH₄Cl = 53.5g/mol):

6.79x10⁻³ moles NH₄Cl * (53.5g / mol) =

0.3633g of NH₄Cl are in the original mixture.

% is:

0.3633g/ 0.5g * 100 = 72.66%

The percentage of pure NH₄Cl in the mixture = 72.66%

Given data :

0.5 gm of mixture of NH₄Cl and NaCI

25 ml of 0.95 N NaOH

Determine the % of pure NH₄Cl in the mixture

Given that the reaction equation of the mixture is ;

NH₄Cl + NaOH ---->  NaCl + NH₃ + H₂O

And the residual solution reaction with H₂SO₄ is

2NaOH + H₂SO₄ ----> Na₂SO₄ + 2H₂O.

∴ H₂SO₄ ( equivalent gram )  = 16mL * 0.1N * 1.06 = 1.696

but the equivalent gram of H₂SO₄ required to neutralize NaOH = 1.696 * ( 100 mL / 10 mL ) = 16.96  

NaOH⁻ = 25mL * 0.95 = 23.75mEq ( from the first reaction equation )

next step : Determine the number of moles of NH₄Cl

 moles of NH₄Cl  = 23.75- 16.96 = 6.79 * 10⁻³

Final step : Calculate the % of pure NH₄CI in the mixture

moles of  NH₄Cl = 6.79 * 10⁻³

molar mass of  NH₄Cl  = 53.5g/mol

∴ mass of NH₄Cl = 6.79 * 10⁻³  * 53.5 = 0.3633g

% of pure NH₄CI in the mixture =  ( 0.3633 / 0.5 ) * 100 = 72.66%

Hence we can conclude that The percentage of pure NH₄Cl in the mixture is  72.66%

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The reaction that is exothermic is as follows: None of the reactions are exothermic (option D).

Exothermic reaction is a kind of reaction that releases energy in the form of heat or that releases heat during its formation, and absorbs it during its decomposition.

An exothermic process releases heat, causing the temperature of the immediate surroundings to rise.

According to this question, the chemical equation that exemplifies exothermic reaction is as follows:

Therefore, none of the options above are exothermic.

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Reaction B is exothermic according to the thermochemical equation provided. Option B is he correct answer.

When energy is transferred to the surroundings, this is called an exothermic reaction, and the temperature of the surroundings increases. Examples of exothermic reactions include: combustion reactions. many oxidation reactions.

According to the thermochemical equation provided, the reaction B is exothermic. In this reaction, the mercury oxide (HgO) reacts with heat to produce mercury (Hg) and oxygen (O₂) gas. The overall reaction gives out heat, making it exothermic.

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Answer:

Mass of iron = 59.375 gm

Explanation:

Calories ( or joules) are added to the water by the hot steel so at the endpoint they are BOTH at 40 C

 The water gains:

     4.18  j/g-C  * 50 * (40-30 C) = 2090 j

The steel gave up 2090 j going from 120 to 40 C

2090 = .44 j/g-C  * m * (120-40)    solve fro m = 59.375 gm

Answer:

A precipate is formed as a result of double displacement reaction.

Explanation:

When two subsatances in solution react they yield a solid and an aqueos compound.

The words that complete the blanks are;

1) transverse waves

2) the ground

3) medium

We know that a wave is simply the kind of disturbance that moves along a medium and in the process there is a transfer of energy from one point to another. There are various kinds of waves and the classification of the waves is based on the amount of energy that is transferred in each case.

1) We know that in the case of the light waves, the direction of the wave is perpendicular to the motion of the particle that causes the wave as such we can all it a transverse wave.

2) We know that a wave must always involve an energy that is travelling and in this case, the energy is travelling through the land and this is the ground.

3) We know that the mechanical waves must have to move through a medium of propagation. As such, mechanical waves must move through a medium.

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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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At the end of the reaction before adding aqueous \(NaHCO_3\), the following chemical species are likely to be present:

A Lewis structure, also known as a Lewis dot diagram, is a way to represent the chemical bonding in a molecule. It uses dots (also called electron dots or Lewis dots) to show the valence electrons on an atom, and lines to show the bonds between atoms. The goal of drawing a Lewis structure is to use the valence electrons of the atoms in a molecule to form the most stable arrangement of atoms, that is to say, to achieve the octet rule where each atom has 8 valence electrons in its outermost shell.

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The correct answer is option (c) Ti4+.

The species which are attracted to a magnetic field are known as paramagnetic species. If we talk about the given options, then we can see that there are only 3 species that are given. Out of these three, only Ti4+ is paramagnetic. How can we determine whether a species is paramagnetic or not? The species which contain unpaired electrons are paramagnetic in nature. If there are all paired electrons, then the species are diamagnetic. If we talk about Ti4+, then it contains 2 unpaired electrons, which makes it paramagnetic. This is the reason why the correct answer is Ti4+.In Ar, all the electrons are paired, which makes it diamagnetic. In O, there are 2 unpaired electrons, which makes it paramagnetic. How can we determine whether a species is paramagnetic or not? The species which contain unpaired electrons are paramagnetic in nature. If there are all paired electrons, then the species are diamagnetic.

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Answer: None of the above

Explanation:

A ph of 7 makes pure water neutral neither acidic nor a base. A base must have a ph higher than 7 and an acid must have a ph lower than 7

Answer: Its B for the Study Island assignment

Explanation:

An RNA molecule that can catalyze chemical reactions is called ribozymes.

Molecules that actually catalyze a chemical reaction are called as enzymes. These catalyst always helps in chemical reactions by lowering their activation energy of the molecules. Enzymes are mainly made up of proteins that contain one or more than one amino acid chain. It is linked together with the peptide bonds.

Deoxy ribozymes or DNA enzymes are the catalytic DNA that performs various catalytic reactions often but not always in this scenario. The existing enzymes (catalytic molecules) majorly are from protein nature. There are certain RNA molecules that possesses catalytic activities, they are called Ribozymes.

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Answer:

6.0 moles.

Explanation:

To solve this problem, we have to use the molarity formula. Remember that the molarity (M) of a solution is the number of moles of solute dissolved in one liter of solution:

We want to find 'moles of solute', so we have to solve for this unknown value and replace the given data (molarity = 2.0 M, liters of solution = 3.0 L):

The answer would be that we require 6.0 moles to prepare the wanted solution.

The number of moles in container 2 is 33.3moles when the container has 27.32L of gas inside it

The number of moles of gas in container 2 can be calculated using the Ideal Gas Law:  

n = PV/RT  

where n is the number of moles of the gas with known volume,

P is the pressure (assumed to be 1 atm for ideal gases),

V is the volume (27.32 liters),

R is the ideal gas constant (0.0821 L·atm/mol·K) and

T is the temperature (assumed to be 273.15 K).  

Plugging in the values, we get:  

n = (1 atm)(27.32 L)/(0.0821 L·atm/mol·K)(273.15 K)

n = 33.3 mol  

Therefore, there are 33.3 moles of gas in container 2.

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Based on the given information, buffer A is a better physiological buffer than buffer B because its pK is closer to the pH of blood, which is 7.4.

A buffer works by maintaining a stable pH level by accepting or donating hydrogen ions. The pK value is a measure of the acidity of a solution and indicates the concentration of hydrogen ions needed to make the solution acidic or basic. The closer the pK value is to the pH of the solution, the more effective the buffer is in maintaining a stable pH. In this case, buffer A's pK value of 7.2 is closer to the pH of blood than buffer B's pK value of 7.9, making it a more effective buffer. Therefore, buffer A would be preferred as a physiological buffer over buffer B.

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The first reaction in this case, the conversion of succinate to fumarate, falls under the dehydrogenation category.

The second reaction falls under the category of oxidative decarboxylation and involves the conversion of beta-ketoglutarate to succinyl-CoA.

Isocitrate's conversion to -Ketoglutarate in the third reaction falls under the category of oxidative decarboxylation.

The fourth reaction, a succinyl-CoA to succinate conversion, falls under the heading of substrate-level phosphorylation.

The fifth reaction, the transformation of L-Malate to oxaloacetate, falls under the dehydrogenation category.

The sixth reaction, the transformation of fumarate to L-malate, falls under the hydration category.

Redox, dehydration, hydration, and decarboxylation reactions are all included in the eight steps of the citric acid cycle. Three NADH molecules, one FADH2 molecule, and one GTP or ATP molecule are formed during each cycle turn and used later in the process of cellular respiration to create ATP for the cell.

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Answer:

Gold

Hope it helps

have a good day