Why should you not plan to start the titration with the acid and base burets filled exactly to the zero mark?

Answer:

P= 167.95 atm

Explanation:

P=(45)(0.0821)(2273)/50

P= 167.95 atm.

PV=nRT

P=nRT/V (rearranged to find Pressure)

Temp= 2000°C + 273 K = 2273 K

R= 0.0821 (atm)(L)/(mol)(K)

n=45 moles

Vol=50L

B. They are also called "metathesis reactions" and

C. They involve two reactant compounds exchanging bonding partners are correct statements that describe a double-displacement reaction.

Double-displacement reactions, also known as metathesis reactions, involve the exchange of positive ions between two reactant compounds to form two new compounds. The reaction can be represented by the general equation:

AB + CD → AD + CB

In this type of reaction, the cations and anions in the reactants switch partners, forming new ionic compounds. These reactions do not necessarily involve oxidation-reduction (redox) reactions, so statement A is incorrect.

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Answer: D. Investigation 4

Answer:

Investigation D

Explanation:

Answer:

Because the ideas about the models changed as more discoveries were made about the atom

Explanation:

I know because i took this test and made a 100% on it

hope I was helpful :)

The molarity of the \(H_2O_2\) solution is 5.885 M.

To calculate the molarity of a solution, we need to know the number of moles of solute (in this case, H2O2) per liter of solution.

First, we need to determine the density of the solution. Since the percentage by mass is given, we can assume that 100 g of solution contains 20 g of H2O2 and 80 g of water. The density of water is 1 g/mL, so the volume of water in 100 g of solution is 80 mL. The total volume of the solution is therefore 100 mL or 0.1 L.

Next, we need to determine the number of moles of H2O2 in 20 g. The molar mass of H2O2 is 34.0147 g/mol, so 20 g of H2O2 is equal to 20/34.0147 = 0.5885 mol.

Finally, we can calculate the molarity of the solution by dividing the number of moles of H2O2 by the total volume of the solution in liters:

Molarity = 0.5885 mol / 0.1 L = 5.885 M

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Answer:

Nitrogen is the limiting reactant, and  

3.74

grams of ammonia is formed.

Explanation:

We have the familiar Haber process equation...

N

2

(

g

)

+

3

H

2

(

g

)

⇌

2

N

H

3

(

g

)

Since the mole ratio of  

N

2

to  

H

2

is  

1

:

3

, then for every mole of nitrogen, we would need three moles of hydrogen.

Explanation:

The density of the polypropylene cylinders can be determined using a ruler by measuring their mass and volume.

To determine the density of the polypropylene cylinders, you can follow these three steps:

Measure the mass of the cylinder:

Using a balance or scale, carefully measure the mass of the polypropylene cylinder. Ensure that the cylinder is free from any additional attachments or debris that could affect the measurement accuracy. Record the mass in grams (g).

Measure the volume of the cylinder:

Place the ruler vertically next to the cylinder and ensure it is aligned with the base of the cylinder. Observe the height of the cylinder by reading the measurement from the ruler markings. Next, measure the diameter of the cylinder by placing the ruler horizontally across the widest part of the cylinder and recording the measurement from the markings. Using these measurements, calculate the volume of the cylinder using the formula for the volume of a cylinder: V = πr²h, where r is the radius (half the diameter) and h is the height. Record the volume in cubic centimeters (cm³).

Calculate the density:

Now that you have the mass (in grams) and volume (in cubic centimeters) of the cylinder, you can calculate its density. Use the formula: Density = mass/volume. Divide the mass of the cylinder by its volume to obtain the density. The density will be expressed in grams per cubic centimeter (g/cm³).

By following these three steps and using a ruler with markings to the millimeter, you can determine the density of the polypropylene cylinders.

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Answer: Stimulus

Explanation: The definition of Stimulus is "a thing or event that evokes a specific functional reaction in an organ or tissue," according to the Oxford Dictionary. So the book dropping and causing a noise is an example of a stimulus.

The equilibrium concentration of benzene in the solution is 20 ppm or 20 μg/mL.

The equilibrium concentration of benzene within the answer can be decided via the usage of the mass balance equation, which states that the mass of a solute in a gadget stays regular at equilibrium.

In this situation, we have 10 ml of a 100 ppm (parts per million) solution of benzene in water, this means that the awareness of benzene in the answer is 100 mg/L or 100 μg/mL.

We want to decide the equilibrium concentration of benzene in the answer after it's far positioned in a 40 ml vial at 20°c. When the solution is located within the vial, the total extent of the system turns to 50 ml.

At equilibrium, the concentration of benzene inside the solution can be identified throughout the vial. Consequently, we will use the following equation to calculate the equilibrium awareness:

initial amount of benzene = equilibrium concentration x total volume

the initial quantity of benzene within the machine may be calculated as follows:

preliminary quantity of benzene = concentration x volume = 100 μg/mL x 10 mL = 1000 μg

substituting the values into the mass balance equation, we get:

1000 μg = equilibrium attention x 50 m

solving for the equilibrium concentration, we get:

equilibrium concentration = 1000 μg / 50 mL = 20 μg/mL or 20 ppm

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B because decomposition reactions are often caused by the application of heat to break up the bonds within the molecules, which will form the molecules that made up the decomposed molecule.

Answer:  Yes

Explanation:

Liquefied Gases: Liquefied gases are gases which can become liquids at normal temperature when they are inside cylinders under pressure. ... Non-Liquefied Gases: also known as compressed, pressurized or permanent gases. These gases do not become liquid when they are compressed at normal temperatures even at high pressures.

Answer:

i.e. mass of 1 mole of glucose, C6H12O6 = (6 × 12.01 + 12 × 1.01 + 6 × 16.00) g = 180.18 g (using atomic weight data to 2 decimals) 1 mole of carbon atoms weighs 12.01 g and there are 6 moles of C atoms in 1 mole of glucose, so the mass of carbon in 1 mole of glucose = 6 × 12.01 g = 72.06 g.

Answer:

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

mass = Density × volume

From the question we have

mass = 56 × 3.5

We have the final answer as

Hope this helps you

Answer:-2.0

Explanation:

If an automobile slows from 26 m/s to 18 m/s in a period of 4.0 s, the average acceleration is 2.0

Acceleration can be defined as  the vector quantity  and has both magnitude and direction, it is a second derivative of position with respect to time  and it is the first derivative of velocity with respect to time.

The change in the velocity of an object called as acceleration and the Velocity is a vector quantity with both magnitude and direction.

Acceleration can be a change in the direction of an object. For example, while pressing the accelerator of car makes the car go faster.

Acceleration(a)= final velocity(v) –initial velocity(u) time(t)

The velocity at the beginning was ‘u′, and the increased to velocity, ‘v′,  after "t"  time .

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11.11% of the substance's mass was in the solution.

KNO3 dissolves in water in amounts of 38.0 g at 25 °C and 155 g per 100 g at 75 °C.

KNO therefore dissolves in water at a rate of 90 g/100 g at 50 C. You are aware that the rate of dissolution of potassium nitrate, KNO3, in water changes with temperature, ranging from 38.0 g per 100 g at 25 °C to 155 g per 100 g at 75 °C.

The capacity of a substance to dissolve in a liquid is known as solubility.

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Five observable properties for separating mixtures are particle size, colour, texture, shape, magnetic attraction.

Mixtures are compounds that are made up of two or more chemical compounds which are not linked to each other chemically. They can be easily separated.

The mixtures can be separated by properties like particle size, colour, density, shape, magnetic attraction.

Sieving can be used to separate compounds based on particle size. Chromatography can be used to separate compounds based on colour as each colour would have differences in properties. Flotation can be used to separate compounds based on density like oil in water. Centrifugation can be used to separate compounds based on shape. Magnetic separation can be used to separate metals from non-metal compounds in a mixture.

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Answer:

B

Explanation:

None of the other responses doesn't seem right. A is to broad someone can be a scientist and might not be highly educated. C not every scientist studies this field so no. Same goes for D

Answer:

B

Explanation:

The mass of glucose is 259 g

We have to note that if we are to solve the problem that we have we would have to look at the stoichiometry of the reaction and that is why we have the balanced reaction equation here.

The reaction equation is;

6CO2 + 6H2O → C6H12O6 + 6O2

Now we know that;

Number of moles of water = 4.25 g /18 g/mol

= 0.24 moles

Number of moles of CO2 = 18.0 g/44 g/mol

= 0.41 moles

Given the reaction equation;

If 6 moles of CO2produces 1 mole of glucose

0.24 moles of produces 0.24 * 6/1

= 1.44 moles

Mass of glucose =  1.44 moles * 180 g/mol

= 259 g

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Answer:

The correct option is D

Explanation:

Water molecules are polar because there structures are made up two sides; the positively charged side (the hydrogen side) and the negatively charged side (the oxygen side). The atoms in the water molecule are joined together by covalent bond - meaning there is sharing of electrons between the constituent atoms. The oxygen atom is bigger/larger (in size) and has a higher electronegativity (ability to attract electrons) hence, the electrons tend to spend more time around the oxygen than the hydrogen atom.

The Bode plot is given in the image and from the graph it is known that the value of Kcr is 0.924 rad/sec.

Generally a Bode plot is simply defined as a plot of magnitude and phase of a transfer function as frequency varies. However, we will want to be able to display always a large range of frequencies and magnitudes, so we will plot the logarithm of frequency, and use a logarithmic (dB, or decibel) scale for the magnitude as well.

Basically, the Bode plot is a very popular tool with control system engineers as it lets them to achieve desired closed-loop system performance by graphically shaping the open-loop frequency response using clear and easy-to-understand rules.

From the above bode plot, we can see the 3-dB bandwidth of the system = 0.924 rad/sec.

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The answer is Solution!

Explanation:

Solution is a homogeneous mixture

of two or more substance. In a

sugar solution, sugar gets uniformly

mixed with water

The command that allows moving a file from one location to another is the "mv command".

The mv command renames or transfers files and folders from one directory to another. A file or directory keeps its base file name when moved to a new directory. All links to other files are preserved when you transfer a file, with the exception of when you move it to a different file system. A directory and its contents are added beneath the existing directory when you transfer a directory into it.

The TargetDirectory option of the mv command allows you to provide a new file name or a new directory path name when renaming a file or directory.

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Answer:

Since pure natural gas (a.k.a. methane) has no smell, utility companies add smelly, sulfur-containing odorants called mercaptans, or thiols, to warn us if anything is amiss with our pipelines. ... Olfactory receptors are present in specialized sensory cells called olfactory sensory neurons, which line our noses

Explanation:

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12.5 grams will be left.

Given:

half life of X= 6 days

Initial amount - 50 kg

Amount left after 3 days = ?

Half life - The period of time needed for anything to go through a process in which half of it participates, for example, the period of time needed for half of a radioactive substance's atoms to disintegrate. It means after half life the element will become half its quantity.

A quantity's half-life (symbol - t1/2) is the amount of time needed for it to decrease to half of its initial value. In nuclear physics, the phrase is frequently used to indicate how rapidly unstable atoms decay radioactively or how long stable atoms last.

According to the question, If half life is 6 days and we start with 50 kg of element, after 6 days it will become 25 kg and after 3 days it will become 12.5 grams .

t¹/₂ = 6 days

Initial amount = 50 kg

After half life = 50/2

                     = 25 kg

∴ After 3 days = 25/ 2

                        = 12.5 kg

Hence, 12.5 kg is left after 3 days.

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In the given scenario, during the passage of current through a solution of sodium chloride, 2.68×10^16 Na+ ions arrive at the negative electrode and 3.92×10^16 Cl- ions arrive at the positive electrode within a time period of 1.00 second.

The ratio of the number of Na+ ions to the number of Cl- ions is 2.68×10^16:3.92×10^16, which can be simplified to approximately 0.68:1. This indicates that for every 0.68 Na+ ions that arrive at the negative electrode, 1 Cl- ion arrives at the positive electrode.

During electrolysis, ions in the solution migrate towards the electrodes based on their charges. At the negative electrode (cathode), cations such as Na+ gain electrons and are reduced, while at the positive electrode (anode), anions like Cl- lose electrons and are oxidized. The flow of ions is driven by the applied electric field.

In this case, the ratio of Na+ ions to Cl- ions that arrive at the electrodes depends on the charge and stoichiometry of the reaction. Since the charge on each Na+ ion is +1 and on each Cl- ion is -1, the ratio of their charges is 1:1.

This implies that for every 1 Cl- ion that arrives at the positive electrode, 1 Na+ ion should arrive at the negative electrode. However, the given data shows a slightly different ratio of 0.68:1, indicating that some factors like diffusion or other side reactions may have influenced the movement of ions.

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The number of atoms in 1 inch is 240 billion atoms

Given:

diameter of atom = 1.0 × 10^-10 m

To Find:

atoms are there along a 1.0-inch line

Solution:

1 inch = 0.254 m

0.254 m = 1 inch

1 m = 1/0.254 = 3.93 inch

1.0 × 10^ -10 = 3.93 x 1.0 × 10^-10 = 3.93 x 10^-10 inch

3.937 x 10-2 inches. This is approximately 4 one-billionths of an inch.

Divide 24 cm by the atomic diameter to get the number of atoms.

24/ (1.0 x 10^-10)= 24 x 10^10 = 2.4 x 10¹¹

240 billion atoms

Hence, the number of atoms in 1 inch is 240 billion atoms

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255.7 KJ of heat is needed to decompose water and produce 17g of oxygen.

Balance chemical reaction is given by,

H₂O → H₂ + 1/2 O₂ .

Atomic mass of H = 1 u ,

Atomic mass of O = 16 u ,

Molar mass of H₂O = 2 × 1 + 1 × 16 = 18 g/mol ,

Molar mass of O₂ = 2 × 16 = 32 g/mol ,

Moles = mass/molar mass ,

Moles of H₂O = 100/18 = 5.555 mol ,

Moles of O₂ = 17/32 = 0.5312 mol ,

From balanced chemical reaction :

1 mol H₂O --------> 0.5 mol O₂

x --------> 0.5312 mol O₂ .

x = 0.5312/0.5 = 1.0625 mol H₂O

Moles of H₂O = 1.0625 mol  ,

Hence ,

5.555 mol H₂O ----------> 1337 KJ

1.0625 mol H₂O ----------> x

x = 1.0625 mol H2O × 1337 KJ/5.555 mol H₂O

x = 255.7 KJ .

Heat = 255.7 KJ .

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An animal that is overmatching, like the fox in this case, will overcommit to one resource, even if it is not the most efficient use of time and energy, and it will remain there even after other patches have become more profitable. So, this is how overmatching bias is related to the distribution of food among patches by a fox with a sore leg.

The blank space can be filled by the word overmatching bias when discussing the likely scenario when a fox with a sore leg distributes its time between various patches of food.A fox with a sore leg is likely to exhibit overmatching bias when distributing its time between different patches of food. Overmatching is a type of behavioral bias in which the rate of a subject's responding to a stimulus is more sensitive than it would be if the subject were matching. A subject displays overmatching when it responds excessively to a rich stimulus or too little to a lean stimulus.This implies that the fox with a sore leg is more likely to spend a significant amount of time in the patch that has more food even though it knows that it will need to spend more time there to get enough food to survive. An animal that is overmatching, like the fox in this case, will overcommit to one resource, even if it is not the most efficient use of time and energy, and it will remain there even after other patches have become more profitable. So, this is how overmatching bias is related to the distribution of food among patches by a fox with a sore leg.

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The energy efficiency of a fuel cell can be calculated by dividing the electrical energy output by the energy input. In a fuel cell, the energy input refers to the chemical energy stored in the fuel that is converted to electrical energy through a redox reaction.

This redox reaction is spontaneous, meaning that it releases energy when it occurs. Therefore,  energy input is calculated by measuring the heat released by the reaction, which is proportional to the chemical energy of  fuel. The energy output is determined by measuring the electrical energy produced by  fuel cell. The energy efficiency is expressed as  percentage, where the higher the percentage, more efficient the fuel cell is in converting chemical energy to electrical energy.

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A neutral atom of the element with 15 electrons is phosphorus with a ground state electron configuration of 1s2 2s2 2p6 3s2 3p3. It is classified as a nonmetal element in group 15. The atoms of this element are diamagnetic, as all electrons are paired up in their orbitals.

A neutral atom is an atom that has an equal number of protons and electrons. In the case of this certain element with 15 electrons, its ground state electron configuration would be 1s2 2s2 2p6 3s2 3p3.

This means that the first shell (n=1) has 2 electrons, the second shell (n=2) has 8 electrons, and the third shell (n=3) has 5 electrons.

Based on its position in the periodic table and the number of valence electrons it has, the element with this electron configuration is phosphorus. Phosphorus is a nonmetal element that belongs to group 15, also known as the nitrogen group.

To determine whether the atoms of this element are diamagnetic or paramagnetic, we need to look at its electron configuration. In this case, we can see that all the electrons are paired up in their respective orbitals, meaning there are no unpaired electrons.

This makes the element diamagnetic, which means it does not have a magnetic field of its own and will not be attracted to a magnetic field.

In summary, a neutral atom of the element with 15 electrons is phosphorus with a ground state electron configuration of 1s2 2s2 2p6 3s2 3p3. It is classified as a nonmetal element in group 15. The atoms of this element are diamagnetic, as all electrons are paired up in their orbitals.

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