combustion analysis of a 0.675 g sample of an unknown compound that contains only carbon, hydrogen, and oxygen gives 0.627 g of co2 and 1.534 g of h2o. the molecular mass of the unknown is

Answer:

1. positive

2. no relationship

3. negative

Explanation:

1. increasing would mean x and y are becoming greater

2. straight across would not be increasing x or y

3. decreasing would mean y (probably not x) is getting smaller

i hope that's what you're looking for

In general, the most precise volumetric glassware for delivering a specific volume of liquid is the volumetric pipette.

This is because volumetric pipettes are designed to deliver a specific, precise volume of liquid at a specific temperature, whereas other types of volumetric glassware such as graduated cylinders or burettes have greater variability in the volumes they deliver.

Additionally, volumetric pipettes have a smaller margin of error and are calibrated to a higher degree of accuracy compared to other types of volumetric glassware.

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Answer:

File down there

Explanation:

When the proton number and electron number are unequal, the atom or molecule is an ion.

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Answer:

In a nonpolar covalent bond, the atoms share electrons equally with one another.

Explanation:

Nonpolar covalent bonds are a type of bond that occurs when two atoms share a pair of electrons with each other. These shared electrons glue two or more atoms together to form a molecule.

Answer:

D: but see below.

Explanation:

There are two main disadvantages to a pneumatic  system

1. They require a compressor of some sort.

2. They can be slow to respond.

That makes car brakes the choice of engineers to be the hydraulic system a far superior choice for automobiles.

A car usually has to stop quickly and efficiently.

A: hydraulic systems generally do not provide a cushioning effect. I would say A is not what you want.

C. Hydraulic systems are quick to respond. The answer is not C

D. Work well at all Temperature ranges. They better do this. A few days ago the outside temperature where I live reached - 40. The summer can reach plus 30 C. That's a range of 70 degrees. They better work over this range.

Unfortunately B is also true. I think you are intended to pick B, but D is also true. Perhaps the    question means a greater range than 70 degrees. If that is so, B is really your better answer.

A minor contribution from star nucleosynthesis to the Big Bang

Helium is utilized to create a neutral protective atmosphere for the production of fiber optics and semiconductors as well as for arc welding because of how little it reacts. Nitrogen is also used to fill car airbags after an accident since it diffuses quickly and can be utilized for detect defects, such as those in automotive air conditioning systems.

Natural gas reserves are the most prevalent source of helium, a non-renewable resource. Natural gas in Texas, Oklahoma, and Kansas is among the most helium-rich in the world due to the region's geology.

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The molarity  of the KOH solution is 0.46 M

A titration is a technique where a solution of known concentration is used to determine the concentration of an unknown solution. For titration procedures, it is important to determine the chemical reaction involved. For this problem, the reaction would be:

KOH + HCl = KCl + H2O

We calculate as follows:

0.02787 L ( 0.8186 M ) ( 1 mol KOH / 1 mol HCl ) = 0.0228 mol KOH

MOlarity =moles of solute / liters of solution

Molarity = 0.0228 / 0.05

Molarity = 0.46 M KOH

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Answer:

it is C

Explanation:i had this on my test and got it right lol

The dietary components cannot be used to element synthesize and store glycogen is Lipids. Glycogen synthesis is mainly driven by insulin, which is a hormone that is secreted by the pancreas.

Glycogen is a complex carbohydrate that is used to store glucose in animals. Glycogen synthesis is mainly driven by insulin, which is a hormone that is secreted by the pancreas. When insulin levels are high, glucose is converted into glycogen and stored in the liver and muscle cells.Lipids cannot be used to synthesize and store glycogen. Lipids are a type of macronutrient that is used to store energy in the form of fat.

Glycogen is a complex carbohydrate that is used to store glucose in animals. Glycogen synthesis is mainly driven by insulin, which is a hormone that is secreted by the pancreas. When insulin levels are high, glucose is converted into glycogen and stored in the liver and muscle cells.Lipids cannot be used to synthesize and store glycogen. Lipids are synthesized from glycerol and fatty acids, which are derived from carbohydrates and proteins.

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Answer:

C. KMnO4/H+

Explanation:

Oxidizing agent is a substance that has the ability to accept electrons from other substances.

1.0 m \(HNO_3\) is added to 100 ml of water, the result is a solution with a concentration of 0.001 m \(HNO_3\) and the ph of 0.001 M \(HNO_3\) is 3

pH historically denoting "potential of hydrogen" (or "power of hydrogen") is a scale used to specify the acidity or basicity of an aqueous solution

GIven ,

\(H^{+}\) = \(10^{-3}\) M

we have the formula for

\(_PH\) = - log [\(H^{+}\)]

\(_PH\) = - log [ \(10^{-3}\) ]

       = 3 log 10

  \(_PH\) = 3

Hence, \(_PH\) of water is 7 but after adding 1 drop (0.001 m \(HNO_3\) ), It changes to 3.

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The compound with the SMILES string COCCOC has the structure: CH3-O-CH2-CH2-O-CH3. In this molecule, the protons are labeled as follows:

I. Protons on the first carbon (CH3)

II. Protons on the second carbon (CH2)

III. Protons on the third carbon (CH2)

IV. Protons on the fourth carbon (CH3)

The correct order of increasing chemical shifts is I < II ≈ III < IV.

In a 1H NMR spectrum, chemical shifts depend on the electron density around the protons and their environment. Here is a correct prediction of the chemical shifts for the signals:

I. Protons on the first carbon (CH3) will have the lowest chemical shift, as they are adjacent to an electron-rich oxygen atom, which decreases the electron density around the protons.

II. Protons on the second carbon (CH2) will have a higher chemical shift than I, due to being further away from the oxygen atom, but will still be relatively low as they are adjacent to a CH3 group.

III. Protons on the third carbon (CH2) will have a similar chemical shift to II, as their environment is quite similar.

IV. Protons on the fourth carbon (CH3) will have the highest chemical shift, as they are furthest from the oxygen atoms and adjacent to a CH2 group.

Therefore, the correct order of increasing chemical shifts is: I < II ≈ III < IV.

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Answer:

P = 795.77 Mpa

Explanation:

Given that,

Force exerted by the hammer, F = 10⁴ N

The nail can be considered as a circle with radius of \(2\times 10^{-3}\ m\)

We need to find the pressure exerted on the wall. Pressure is equal to force acting per unit area. So

\(P=\dfrac{F}{A}\\\\P=\dfrac{10^4\ N}{\pi \times (2\times 10^{-3})^2}\\\\P=795774715.45\ Pa\)

We know that, 1 MPa = 1000000 Pa

So, P = 795.77 Mpa

So, the pressure exerted on the wall is 795.77 Mpa.

Answer:

0.055.

Explanation:

1) 1 mole is 22.4 [L], then

2) 1.23 [L] is 1.23/22.4=0.055 [moles].

Answer:

Every atom has no overall charge (neutral). This is because they contain equal numbers of positive protons and negative electrons. These opposite charges cancel each other out making the atom neutral.

Explanation:

Answer:

The new volume is 5.0L

Explanation:

Given:

Initial pressure (P₁) = 1.4 atm

Initial volume (V₁) = 2.3 L

Final pressure (P₂) = 0.65 atm

We'll use Boyle's Law:

P₁V₁ = P₂V₂

Substituting the given values:

(1.4 atm)(2.3 L) = (0.65 atm)(V₂)

Now, let's solve for V₂:

V₂ = (1.4 atm * 2.3 L) / 0.65 atm

Calculating this expression step-by-step:

V₂ = (3.22 atm·L) / 0.65 atm

V₂ ≈ 4.953 L

Rounded to one decimal place, the new volume is approximately 5.0 L.

The key differences between metal properties and properties of ionic bonds lie in their conductive nature, malleability, ductility, and solubility.

Properties of Metals:

- Metal atoms tend to lose their valence electrons and move freely throughout the solid metal as cations.

- Metals are good conductors of heat and electricity.

- They are malleable and ductile, meaning they can be hammered into thin sheets and pulled into wires.

- Metals are shiny and lustrous.

- They have high melting and boiling points.

- Metals are held together by metallic bonds.

Properties of Ionic Bonds:

- Ionic bonds form between ions of opposite charges (anions and cations) in an ionic compound.

- Ionic compounds are typically brittle and easily break into pieces.

- They have high melting and boiling points.

- Ionic compounds are not malleable or ductile.

- They are electrically conductive in the molten or dissolved state but not in the solid state.

- Ionic compounds are soluble in polar solvents such as water.

Metals exhibit these properties due to their metallic bonding, while ionic compounds have unique properties resulting from the electrostatic attraction between ions of opposite charges.

Therefore, the key differences between metal properties and properties of ionic bonds lie in their conductive nature, malleability, ductility, and solubility.

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To deploy configuration profiles for computers from Jamf Pro, the Apple Push Notification service (APNs) must be available.

APNs is a cloud-based service provided by Apple that enables the secure transfer of data between Apple devices and servers. It is essential for communication between Jamf Pro and Apple devices during the deployment of configuration profiles.

APNs is used to initiate the connection between the devices and Jamf Pro, allowing for the transfer of the configuration profiles. Without APNs, it would be impossible to deploy configuration profiles to Apple devices using Jamf Pro.

Therefore, it is critical to ensure that APNs is available and functioning correctly before attempting to deploy configuration profiles using Jamf Pro.

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Physical conditions that can optimize rate of diffusion of a gas across a membrane and relate these to Fick’s Law of Diffusion are The partial pressure difference of gases, The surface area of the membrane, The thickness of the membrane, Ventilation and Increased surface area

Physical conditions that can optimize rate of diffusion of a gas across a membrane and relate these to Fick’s Law of Diffusion are the following:

The partial pressure difference of gases: It is the main driving force behind gas exchange. Fick's Law of Diffusion states that the rate of diffusion of a gas is directly proportional to the pressure gradient. The greater the partial pressure difference, the faster the rate of gas diffusion.

The surface area of the membrane: Fick's Law of Diffusion states that the rate of gas diffusion is proportional to the surface area of the membrane. The more surface area available for gas exchange, the faster the rate of gas diffusion.

The thickness of the membrane: Fick's Law of Diffusion also states that the rate of gas diffusion is inversely proportional to the thickness of the membrane. The thinner the membrane, the faster the rate of gas diffusion.

Animal respiratory systems have evolved in order to maximize the exchange of O2 and CO2 across their membranes in the following ways:

Ventilation: The movement of air or water over the respiratory surface increases the partial pressure gradient of gases. This increases the rate of diffusion of gases across the membrane.

Increased surface area: Respiratory surfaces have evolved to have a large surface area to increase the rate of diffusion of gases across the membrane.Thin respiratory surfaces: Respiratory surfaces have evolved to be thin to reduce the diffusion distance for gases. This increases the rate of diffusion of gases across the membrane.

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In liquid-liquid extraction, the distribution of an organic compound between two immiscible liquid phases, such as water and dichloromethane (DCM), depends on the compound's solubility in each solvent and the relative affinity it has for each phase.

If the organic compound is more soluble in DCM than in water, it will preferentially partition into the DCM layer. This is because like dissolves like, and organic compounds, being nonpolar, tend to be more soluble in nonpolar solvents like DCM. In this case, most of the organic compound will end up in the DCM layer.

Conversely, if the organic compound is more soluble in water than in DCM, it will predominantly distribute into the water layer. Polar or hydrophilic organic compounds tend to be more soluble in water. In this scenario, most of the organic compound will be found in the water layer.

In cases where the compound has roughly equal solubility in both solvents, it can distribute evenly between the two layers. This is known as a "partitioning equilibrium" where the compound's concentration in each layer is proportional to its solubility in each solvent.

However, it is important to note that there may be exceptions or complicating factors depending on the specific chemical properties of the organic compound being extracted. Factors such as pH, temperature, and the presence of other solutes can influence the distribution behavior.

Sublimation, on the other hand, refers to the process where a solid compound directly transitions to a gaseous state without passing through a liquid phase. Liquid-liquid extraction typically does not involve sublimation, as it is focused on separating compounds in solution based on their partitioning between two immiscible liquid phases.

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Answer:

Polar molecules occur when there is an electronegativity difference between the bonded atoms. Nonpolar molecules occur when electrons are shared equal between atoms of a diatomic molecule or when polar bonds in a larger molecule cancel each other out

Explanation:

Answer:

It is both accurate and precise.

Explanation:

Precision and accuracy are two different terms used to describe data or measurements. Accuracy refers to how close a set of measurements/experimental values is to an accepted or correct value while Precision refers to how close a series of experimental values are to one another.

In the given set of data in the question below, the Correct Value is 59.2 while the experimental values are as follows;

Trial 1: 58.7

Trial 2: 59.3

Trial 3: 60.0

Trial 4: 58.9

Trial 5: 59.2

Based on comparison, it can be observed that these experimental values are close to the correct value (59.2). Hence, they are said to be ACCURATE. Also, the experimental values are close to one another, hence, they are said to be PRECISE.

Therefore, the data set is both accurate and precise.

From the given options, the molecule that does not form hydrogen bonding attractions is CH₂CH₃OCH₂CH₃, which is also known as diethyl ether.

Hydrogen bonding occurs when hydrogen atoms are bonded directly to highly electronegative atoms such as oxygen, nitrogen, or fluorine. In the case of diethyl ether, there are no hydrogen atoms directly bonded to oxygen or any other electronegative atom, so it does not exhibit hydrogen bonding.

Considering the given molecules:

HOOH - has a hydrogen bonding

CH₃CH₂OH - has a hydrogen bonding

CH₃NH₂ - - has a hydrogen bonding

CH₃CH₂OCH₂CH₃ - does not have a hydrogen bonding

HF - has a hydrogen bonding

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The property of matter that is conserved in chemical reactions and shown by balanced equations is known as the Law of Conservation of Mass. According to this law, mass can neither be created nor destroyed in a chemical reaction; it can only be transformed from one form to another.For instance, when two substances are combined, they react and form a new substance.

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Answer:

Services raise the pH in the hair to a alkaline state in order to soften and swell the hair shaft. Disulfide, hydrogen, salt. Side bonds are responsible for the strength and elasticity of the hair. Altering these is what make wet setting, thermal styling, permanent waving, curl reforming, and relaxing possible

A pH of 7 is neutral, a pH below 7 is acidic, and pH above 7 is alkaline. ... Chemical Texturizers raise the pH of the hair to an alkaline state in order to soften and swell the hair shaft. This action lifts the cuticle layer, and allows the solution to reach the cortex layer where restructuring takes place.

Explanation:

Answer:

b. the precision of the throws

Explanation:

When dealing with paper delivery homeowners are mainly concerned about the precision of the throws. They technically want the paper to land directly on their front door. Landing there, the paper will be protected from the rain and be visible for the homeowner to easily see it and pick it up in the morning when they wake up. Bad precision can lead the paper to fall into a puddle or on the grass where it will get wet and become useless or even end up breaking a window or other fragile items.