Lundstrom Company began making sales on credit during 20X1. The company used the direct write-off method for uncollectible accounts. A material amount of uncollectible accounts resulting from sales made during 20X1 were written off during 20X2. What was the effect of this write-off on net income for 20X1 and 20X2, respectively

To do this division, we can divide the power of ten and the leadin numbers separately:

Answer:

plankton

Explanation:

like in spongebob lol but for real I'm a marine biologist I know this is the answer lol

The Big Bang theory is the idea that the universe began as just a single point, which results in the growing of this world.

From the Big Bang theory which would you believe to be the closest explaining the creation of the universe?

The Big Bang theory is the best model of the astronomers to explain the creation of matter, in space and time 13.7 billion years ago. The best about this theory is about the explosion that started it all and how the universe growed from the size of an atom to encompass everything in existence today. This argues that the Universe began as almost a single point with a temperature and density of near infinity.

So we can conclude that: The Big Bang theory is the idea that the universe began as just a single point, which results in the growing of this world.

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The curve represents saturation. Below the curve, the water is unsaturated. Above the curve, water is supersaturated. This means that more solute is present than the water can contain.

The line of the solubility curve indicates that the solution is saturated. A saturated solution is defined as a solution in which 100 g of solute is dissolved in 100 g of water. Simulations below this line indicate unsaturated solutions.

The difference between unsaturated and saturated solutes can be determined by adding very small amounts of solute to the solution. In unsaturated solutes, solutes will dissolve, and solutes in saturated solutes will not dissolve. In saturated solutes, crystals will form very quickly around the added solute.

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There were approximately 128.94 g of ZnSO4 and 109.34 g of CoSO4 present in the original solution.

Electroplating is the process of coating a metal object with a thin layer of another metal by means of electrolysis. In an electrolytic cell with a solution of a salt of the metal to be deposited, the item to be plated is made the cathode (negative electrode).

The electroplating of Zn and Co from the solution involves the transfer of electrons from the cathode to the metal ions in the solution, which results in the deposition of the metals on the cathode. The amount of electricity required for this process is proportional to the amount of metal ions present in the solution, which in turn is proportional to the mass of the metals deposited.

Let's first calculate the moles of electrons transferred in the electroplating reaction:

1.436 F × (1 mol e⁻/1 F) = 1.436 mol e⁻

Since the number of electrons transferred is the same for both Zn and Co, the ratio of the moles of Zn and Co deposited should be the same as the ratio of their atomic masses. The atomic masses of Zn and Co are 65.38 g/mol and 58.93 g/mol, respectively, so the ratio of their masses is:

65.38 g/mol ÷ 58.93 g/mol ≈ 1.11

This means that for every 1.11 moles of Zn deposited, 1 mole of Co is deposited.

Let's assume that x moles of ZnSO4 and y moles of CoSO4 were present in the original solution. Then we can set up the following equations based on the balanced electroplating reaction:

2 e⁻ + Zn²+ → Zn (s)

2 e⁻ + Co²+ → Co (s)

The total number of moles of electrons transferred in the electroplating reaction is:

1.436 mol e⁻ = 2 mol e⁻/mol Zn × x mol ZnSO4 + 2 mol e⁻/mol Co × y mol CoSO4

Simplifying and solving for y:

y = (1.436 mol e⁻ - 2 mol e⁻/mol Zn × x mol ZnSO4) / (2 mol e⁻/mol Co)

y = 0.718 mol CoSO4

Since the ratio of the moles of Zn to Co deposited is 1.11, we can calculate the moles of ZnSO4 from the moles of CoSO4:

x = (1.11 mol Zn/mol Co) × (0.718 mol CoSO4) = 0.798 mol ZnSO4

Finally, we can calculate the masses of ZnSO4 and CoSO4:

mass of ZnSO4 = 0.798 mol × 161.47 g/mol = 128.94 g

mass of CoSO4 = 0.718 mol × 152.06 g/mol = 109.34 g

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Sodium (Na) and chlorine (Cl) are the largest dissolved components in ocean water due to the abundance of sodium and chloride ions in the Earth's crust and the continuous input of these elements into the oceans through various processes. Sodium is one of the most common elements in the Earth's crust, and chlorine is widely distributed in rocks, minerals, and salts.

Over millions of years, weathering of rocks, volcanic activity, and erosion release these elements into rivers and ultimately into the oceans. The combination of sodium and chlorine ions results in the formation of sodium chloride, which is commonly known as table salt and contributes to the salinity of seawater.

The most abundant dissolved gas in ocean water is carbon dioxide (CO2). Carbon dioxide dissolves in the surface waters of the ocean through gas exchange with the atmosphere. It plays a crucial role in regulating the pH of seawater and is an essential component of the carbon cycle. Carbon dioxide is involved in various biological and chemical processes in the ocean, including photosynthesis by marine plants and the formation of calcium carbonate shells by marine organisms. Additionally, the increase in atmospheric carbon dioxide due to human activities has led to ocean acidification, which is a significant concern for marine ecosystems.

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Due to the fact that they combine to form the ionic compound sodium chloride (NaCl), also known as salt, sodium (Na) and chlorine (Cl) are the two most abundant dissolved elements in ocean water.

Thus, Salts are among the many dissolved compounds that water from rivers and streams transports into the ocean.

In particular, sodium and chloride ions have accumulated in the ocean throughout time, leading to the high concentration of these elements in seawater. Magnesium, calcium, potassium, and sulphate ions are among the other dissolved substances in ocean water.

Oxygen  is the dissolved gas that is most prevalent in ocean water.

Thus, Due to the fact that they combine to form the ionic compound sodium chloride (NaCl), also known as salt, sodium (Na) and chlorine (Cl) are the two most abundant dissolved elements in ocean water.

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Answer : 501 g = 5.01 × 10¹¹ ng

Explanation :

The conversions used to convert gram to nano-gram is:

1 g = 10 dg

1 dg = 10 cg

1 cg = 10 mg

1 mg = 1000 μg

1 μg = 1000 ng

As we are given:

Convert 501 g to ng.

As,

1 g = 10 dg

So,

501 g = 501 × 10 dg

         = 501 × 10 × 10 cg                                   ( 1 dg = 10 cg )

         = 501 × 10 × 10 × 10 mg                          ( 1 cg = 10 mg )

         = 501 × 10 × 10 × 10 × 1000 μg                 ( 1 mg = 1000 μg )

         = 501 × 10 × 10 × 10 × 1000 × 1000 ng       ( 1 μg = 1000 ng )

501 g = 501000000000 ng = 5.01 × 10¹¹ ng

Therefore, 501 g = 5.01 × 10¹¹ ng

The elements can also be classified into the main-group elements (or representative elements) in the columns labeled 1, 2, and 13–18; the transition metals in the columns labeled 3–12; and inner transition metals in the two rows at the bottom of the table (the top-row elements are called lanthanides and the bottom-row ...

Hello,

Elements are a group of the Periodic Table that shares common valence electron structures. They are arranged in order of increasing Atomic Number.

In modern periodic table they are classified into three parts- metals, non-metals and metalloids.

In detail:-

• Metals- Metals are those elements which donate electrons. Ex- Na, K, Rb, Mg, Ca, etc.

• Non-metals- Non-metals are those elements which accept electrons. Ex- N, O, F, Cl, etc .

• Metalloids- Metalloids are those elements which show property of both metals and non-metals. Ex- B, Si, Ge, etc.

Hope it helps...

(by Benjemin)

Answer:

An objects accelarates in the same direction as that of the force applied.

Explanation:

The mechanical nano-oscillators can detect a mass change as small as 10^{-21} kg, and the atomic mass of manganese is 54.94 g.

We are required to find how many atoms of manganese must be deposited on such an oscillator to produce a measurable mass change.

We can use the following relationship:

1 mole of any element contains a certain number of atoms, which is known as the Avogadro number (6.02 × 10^{23} atoms per mole).

The mass of 1 mole of an element in grams is numerically equal to its atomic mass. Thus, the mass of one manganese atom is:

Atomic mass of manganese, Mn = 54.94 g

The mass of 1 mole of manganese is 54.94 g.

The mass of one manganese atom = Atomic mass of manganese/Avogadro number= 54.94 g/6.02 × 10^{23}= 9.14 × 10^{-23} g/molecule.

The required number of atoms to produce a measurable mass change of 10^{-21} kg is obtained by dividing 10^{-21} kg by the mass of one manganese atom:

Total number of atoms = (10^{-21} kg)/(9.14 × 10^{-23} g/molecule)

Total number of atoms = 109.53 or 150 atoms (rounded off to the nearest whole number)

Therefore, the number of atoms of manganese that must be deposited on such an oscillator to produce a measurable mass change is 150 atoms.

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Answer:

The number of the NMR signals compound CH3OCH2CH(CH3)2 shows are:

A spectroscopic method for observing the local magnetic fields around atomic nuclei is nuclear magnetic resonance spectroscopy, sometimes referred to as magnetic resonance spectroscopy (MRS) or NMR spectroscopy.

This spectroscopy's foundation is the measurement of electromagnetic radiations' absorption in the radio frequency range between 4 and 900 MHz. Nuclear Magnetic Resonance Spectroscopy is the name given to the form of spectroscopy that is used to measure the absorption of radio waves in the presence of a magnetic field.

The sample is put in a magnetic field, and the nuclear magnetic resonance (NMR) signal is generated by radio waves excitation of the sample's nuclei, which is detected by sensitive radio receivers.

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The number of the NMR signals compound CH3OCH2CH(CH3)2 shows are:

3 H with singlet.
6 H with doublet.
1 H with muliplet.
2 H with doublet.

A spectroscopic method for observing the local magnetic fields around atomic nuclei is nuclear magnetic resonance spectroscopy, sometimes referred to as magnetic resonance spectroscopy (MRS) or NMR spectroscopy.

This spectroscopy's foundation is the measurement of electromagnetic radiations' absorption in the radio frequency range between 4 and 900 MHz. Nuclear Magnetic Resonance Spectroscopy is the name given to the form of spectroscopy that is used to measure the absorption of radio waves in the presence of a magnetic field.

The sample is put in a magnetic field, and the nuclear magnetic resonance (NMR) signal is generated by radio waves excitation of the sample's nuclei, which is detected by sensitive radio receivers.

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D is the answer cause two h20 + o2(g)

Rounded to the nearest significant figure, \(\rm 1.5 \times 10^{23 }\) molecules are in 0.25 mole of \(\rm CO\). The correct answer is option B.

A mole is defined as the amount of a substance that contains exactly      \(\ \rm 6.022 \times 10^{23}\) 'elementary entities' of the given substance.

To calculate the number of molecules in 0.25 mole of CO, we can use Avogadro's number, which is the number of particles (atoms, molecules, etc.) in one mole of a substance. Avogadro's number is approximately  \(\ \rm 6.022 \times 10^{23}\) particles per mole.

Number of molecules = Number of moles x Avogadro's number

Substituting the given values, we get:

Number of molecules = 0.25 mole x \(\ \rm 6.022 \times 10^{23}\) molecules/mole

=  \(\rm 1.5 \times 10^{23 }\)

Therefore, the number of molecules in 0.25 mole of CO is approximately  \(\rm 1.5 \times 10^{23 }\) molecules. Option B is the correct answer.

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Explanation:

awareness programme

Reuse reduce recycle redesign

actively volunteering in scouts

The answer would be for this question is density = 1.95 g ml^-1.

Density is defined as the mass upon volume.

It is denoted by D.

Its unit is g/cm^3.

According to question,

Given,

Mass of an empty beaker = 4.995 g

Mass of unknown acid solution = 2.00 ml

Total or combined mass of the beaker = 9.893 g

To find density of the acid solution.

Calculation -

As you know the mass of empty beaker also the mass of the beaker increases after adding acid solution so,

Mass = 9.893 g - 4.995 g = 4.898 g

As the mass of an acid already mentioned only you need to get the value of the volume,

1 ml * 4.898 g / 2.0 ml = 2.449 g

Now the density of the acid solution is 1.95 g ml^-1.

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The density of the pebble is 2.5g/cm³

CALCULATE DENSITY:

Density = mass (g) ÷ volume (mL)

Density = 35g ÷ 14cm³

Density = 2.5g/cm³

Therefore, the density of the pebble is 2.5g/cm³

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The amount of KNO₃ would dissolve in 100g of water at 50 degrees celcuis to make a saturated solution is 44 g.

To create a saturated solution of KNO₃ in 100g of water at 50 degrees Celsius, the following steps should be taken:

Step 1: Find out the mass of the solvent in the saturated solution.

The solvent is water in this instance. So, using the formula for the mass of a solution, we can calculate the mass of the solvent in the saturated solution as follows:

Mass of solvent = Mass of solution - Mass of solute

= 100 g - Mass of KNO₃

Step 2: Determine the amount of solute that would be dissolved in the solution to make it saturated.

The mass of KNO₃ that would dissolve in 100 g of water at 50°C to create a saturated solution is 56g/100g of water.

Step 3: Calculate the mass of KNO₃ that would dissolve in 100g of water to make a saturated solution.

Mass of KNO₃ = Solubility of KNO₃ × Mass of solvent

Mass of KNO₃ = 56 g/100 g × (100 g - Mass of KNO₃)

Now, let's solve for Mass of KNO₃;

56 = 56g(100-Mass of KNO₃)/100100 - Mass of KNO₃ = 100

Multiply both sides of the equation by 100 to obtain;

5600 - 100 Mass of KNO₃ = 100

Mass of KNO₃ = 5600/10100 - 56

= 44 g

Therefore, 44 g of KNO₃ would dissolve in 100g of water to make a saturated solution.

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Answer:

The answer is "all the cells are too small, which is not seen by the naked eye, that's why we use a microscope to see it".

Explanation:

In the given question the choices were missing so, we define the correct answer only.

Cells are the essential building blocks of all living entities. There will be trillions of cells within the body. They construct a body shape, absorb nutrients, transform them into energy, and conduct specialized features.  

It provides stability and guidance, encourages mitotic cell development, encourages active and passive transfer, generates energy, induces metabolic processes, and contraceptive support.

Answer:

when using would make an athlete stronger when they keep on training with it.

they don't actually use it during a competition because it slows them down and they won't be able to perform well during Competition even though they trained with it

Answer:

Explanation:Well most scientists used microscopes but they also looked at bigger ones so the answer would be “by running experiments that expose there properties”

There are 0.0326 moles in 1.50 g of ethanol. The answer is option B) 0.0326 mol.

To determine the number of moles in a given mass of a substance, we need to use the formula:

moles = mass / molar mass

The molar mass of ethanol (CH₃CH₂OH) can be calculated by summing the atomic masses of each element in the molecule. The atomic masses are obtained from the periodic table.

C = 12.01 g/mol

H = 1.008 g/mol

O = 15.99 g/mol

Molar mass of ethanol = (2 × 12.01) + (6 × 1.008) + 15.99 = 46.07 g/mol

Now, we can substitute the given mass of ethanol and its molar mass in the above formula to calculate the number of moles:

moles = 1.50 g / 46.07 g/mol = 0.0326 mol

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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:

In a reaction mechanism, the rate-determining step is the slowest step with the highest activation energy. The correct answer is option c.

This is because the rate of the overall reaction is determined by the speed of the slowest step, as it limits the rate at which the reaction can occur. The activation energy is the minimum energy required for a reaction to occur, and the higher the activation energy, the slower the reaction rate will be.

Identifying the rate-determining step is important for understanding and controlling the rate of a chemical reaction.

By knowing which step is the slowest, chemists can focus on optimizing conditions for that step to increase the overall reaction rate. This can involve adjusting the temperature, pressure, and concentrations of reactants, as well as adding catalysts to lower the activation energy of the rate-determining step.

Overall, understanding the rate-determining step is critical for designing and optimizing chemical reactions in fields ranging from industrial chemistry to drug discovery.

The correct answer is option c.

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Answer: The average valence electron energy (AVEE) of this element =

1014.2 KJ/ mol  or  1.0142mJ/mol.

Explanation:

The average valence electron energy =  (number of electrons in s subshell  x  Ionization energy of that subshell) + (number of electrons in p subshell  x  Ionization energy of that subshell) / total number of electrons in both subshells of the valence shells.

The 5A elements are non-metals like Nitrogen and Phosphorus with the metallic character increasing as you go down the group, So a new 5A element will have characteristics of its group with 5 valence electron in its outermost shell represented as ns2 np3

Therefore  the average valence electron energy (AVEE) of this element will be calculated as

The average valence electron energy = (2 x 1370  kJ/mol + 3 x 777 kJ/mol.) / 5

2740+2331/ 5 =5071/5

=1014.2 KJ/ mol  or  1.0142mJ/mol.