Vinegar, which contains acetic acid, is used in foods and has few safety concerns​. Hydrochloric acid is used in chemistry labs and requires the use of safety goggles and gloves. Why do the safety concerns for these two acids differ? 2 ... Acetic acid is a weak acid, and hydrochloric acid is a strong acid.

Answer:

pentane= C5H12

C= 5

H= 12

The  statement that  is correct about the rate of most chemical reactions is  :

It increases when the temperature increases.

Therefore option C  is correct

A chemical reaction is described as  a process that leads to the chemical transformation of one set of chemical substances to another.

The types of Chemical Reactions are highlighted below:

Synthesis reactions.

Decomposition reactions.

Single-replacement reactions.

Double-replacement reactions.

In conclusion,  Chemical reactions involve breaking chemical bonds between reactant molecules (particles) and forming new bonds.

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Answer:

m = 8.1 kg

Explanation:

Density of metal ball, d = 8.96 g/cm³

Diameter of ball, d = 12 cm

Radius of ball, r = 6 cm

Density of an object=mass/volume

The metal ball is in the shape of sphere whose volume is given by :

\(V=\dfrac{4}{3}\pi r^3\\\\V=\dfrac{4}{3}\pi (6)^3\\\\V=904.77\ cm^3\)

Now using formula,

\(m=d\times V\\\\m=8.96\ g/cm^3\times 904.77\ cm^3\\\\m=8106.73\ g\)

or

m = 8.1 kg

So, the mass of the metal ball is 8.1 kg.

At 20°c, a 0.376 m aqueous solution of ammonium chloride has a density of 1.0045 g/ml. The mass percent of the ammonium chloride in the solution is 2.003%.

The number of moles of a substance can be estimated as:

\(\mathbf{number\ of\ moles = \dfrac{mass}{molar \ mass}}\)

Given that:

Mass = number of moles × molar mass

Mass = 0.376 × 53.50

Mass = 20.116 grams

In one mL of ammonium chloride; the grams of ammonium chloride is:

\(\mathbf{= \dfrac{20.116 \ grams}{1000 \ mL}}\)

= 0.020116 g/mL

The mass of ammonium chloride in the solution can be computed as:

\(\mathbf{=(\dfrac{mass \ of \ NH_4Cl}{density \ of \ the \ solution})\times 100}\)

\(\mathbf{=(\dfrac{0.020116 }{1.0045})\times 100}\)

= 2.003%

Therefore, we can conclude that the mass percent of the ammonium chloride in the solution is 2.003%.

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We have that for the Question, it can be said that the percentage of arsine molecules have de- composed is

Percentage of arsine molecules=79.62%

From the question we are told

A sample of gaseous arsine (AsH3) in a 460 mL flask at 332 Torr and 223 K, is heated to 437 K, at which temperature arsine decom- poses to solid arsenic and hydrogen gas. The flask is then cooled to 273 K, at which temperature the pressure in the flask is 488 Torr. What percentage of arsine molecules have de- composed?

Answer in units of %

.

Generally the equation for the ideal gas   is mathematically given as

\(PV=nRT\\\\Therefore\\\\(\frac{296}{760})*(0.465)=n*0.0821*213\\\\n=0.010356\\\\\)

Hence

\(\frac{511}{760}*0.6165=nf*0.0821*263\\\\nf=0.014479\\\\0.010356-2x+3x=0.014479\\\\X=0.004123moles\\\\\)

Therefore

\(Percentage\ of\ arsine\ molecules=\frac{0.004123*2}{0.010356}*100\)

Percentage of arsine molecules=79.62%

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Unlike the mercury-in-glass thermometer, the contents of an alcohol thermometer are less toxic and will evaporate quickly. The ethanol version is the most widely used due to the low cost and relatively low hazard posed by the liquid in case of breakage.

Hope that helps!

Answer: 200

Explanation:

The answer is 200 kPa

Organic molecules are more diverse compared to inorganic molecules due to the unique properties of carbon, its ability to form covalent bonds with other elements, and the presence of functional groups, allowing for a wide range of molecular structures and chemical reactions.

Organic molecules are primarily composed of carbon atoms, which possess a unique ability to form strong covalent bonds with other atoms, including carbon itself. Carbon atoms can bond with up to four other atoms, enabling the formation of complex and varied molecular structures. This property, known as catenation, allows carbon to form long chains, branched structures, and ring systems, resulting in an immense diversity of organic compounds.

Furthermore, carbon atoms can also bond with other elements such as hydrogen, oxygen, nitrogen, sulfur, and phosphorus, forming functional groups. These functional groups significantly influence the chemical behavior and reactivity of organic molecules. They introduce specific characteristics and properties, such as acidity, basicity, polarity, and the ability to undergo various types of reactions. The presence of functional groups further expands the possibilities for molecular diversity in organic compounds.

In contrast, inorganic molecules typically lack the same level of structural complexity and diversity found in organic molecules. While inorganic compounds can exhibit a range of chemical properties and reactions, they are often limited by the nature of their bonding and the types of elements involved. Inorganic molecules predominantly involve ionic bonding, where electrons are transferred between atoms, resulting in simpler and more repetitive structures

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The statement; When the temperature of water drops to 0°C, its molecules form regular patterns, which are crystals is true

The crystal structure of ice is hexagonal. Ice forms a crystalline lattice structure, with the oxygen atoms of each water molecule bonded to four neighboring oxygen atoms. The hexagonal arrangement of the water molecules in ice results in a highly organized, closely packed arrangement with a low density.

Thus, we know that when we remove heat from water, there is a lining up of the water molecules and this leads to the crystal structure of ice.

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Fatty acid groups are referred to as B) acyl groups.

Fatty acids are organic compounds that consist of a long hydrocarbon chain with a carboxyl group (-COOH) at one end. The hydrocarbon chain is composed of carbon and hydrogen atoms, and its length can vary. Fatty acids play essential roles in various biological processes and are major components of lipids, including triglycerides and phospholipids.

When a fatty acid is involved in chemical reactions or is attached to other molecules, it typically undergoes a process called activation, where it is converted into an acyl group. An acyl group is formed by replacing the -OH (hydroxyl) group of the carboxyl group with an -OR (alkoxy) group. The -OR group can be derived from various molecules, such as coenzyme A (CoA) or other acyl carrier proteins.

For example, when a fatty acid is activated for incorporation into a triglyceride molecule, it forms a triglyceride acyl group. Similarly, when a fatty acid is incorporated into a phospholipid molecule, it forms a phospholipid acyl group. The acyl group represents the hydrocarbon chain of the fatty acid, which may vary in length and saturation.

Therefore, the correct answer to the question is B) Acyl.

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Combined gas law states that when the number of moles of an ideal gas are held constant, the volume and pressure of the gas are inversely proportional while being directly proportional to temperature.

Under combined gas law, the three (3) main gas laws are combined together and these include:

Mathematically, the combined gas law is given by the formula:

\(\frac{PV}{T} =k\\\\\frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2}\)

Where:

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The NSN test search is used to locate test reports that provide comprehensive information about the testing and evaluation of specific products or items.

The National Stock Number (NSN) test search is used to locate test reports on various products or items. Test reports provide detailed information about the testing and evaluation of a particular product's performance, quality, safety, or compliance with specific standards or requirements. These reports are often conducted by independent testing laboratories or organizations to assess the characteristics and capabilities of the product.

The NSN test search allows users to search for test reports based on the NSN, which is a unique identification number assigned to each item in the federal supply system. By inputting the NSN into the search, individuals or organizations can access relevant test reports associated with that specific item or product.

The test reports obtained through the NSN test search can be valuable for various purposes, such as quality assurance, product development, procurement decisions, or regulatory compliance. They provide important insights into the performance and reliability of the item being tested, allowing users to make informed decisions based on objective evaluation and testing data.

In summary, the NSN test search is used to locate test reports that provide comprehensive information about the testing and evaluation of specific products or items.

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Answer:

\(\displaystyle K_a = \frac{[\text{H$_3$O}^+][\text{F}^-]}{[\text{HF}]}\)

Explanation:

Write the reaction of HF (a weak acid) with water:
\(\displaystyle \text{HF}_\text{(aq)} + \text{H$_2$O}_\text{($\ell$)} \rightleftharpoons \text{H$_3$O}^+_\text{(aq)} + \text{F}^-_\text{(aq)}\)

Recall that the equilibrium constant expression for an equilibrium reaction is the product of the concentration of the products over the product of the concentration of the reactants raised to their respective coefficients.

The equilibrium constant expression for this equation will hence be:

\(\displaystyle K_a = \frac{[\text{H$_3$O}^+][\text{F}^-]}{[\text{HF}]}\)

Note that pure solids and liquids are not included in the equilibrium expression.

In conclusion:

\(\displaystyle K_a = \frac{[\text{H$_3$O}^+][\text{F}^-]}{[\text{HF}]}\)

From the question;

1) Sucrose has the highest freezing  point

2) Calcium chloride has the lowest freezing point

3) Water has the highest boiling point

4) Calcium chloride has the highest osmotic pressure.

Physical characteristics of a solution known as colligative properties are those that are simply dependent on the concentration of solute particles, not on the precise nature of the solute. These characteristics result from interactions between the solute particles and the solvent in a solution.

All the properties that are mentioned here such as boiling points and freezing points are colligative properties.

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The pH of the solution after 5.00 mL of the titrant was added.

pH= 13.4.

a)

Before adding any titrant,

[NaOH] = [OH-] = 0.260 M

pOH = -log [OH-]

         = -log (0.260)

         = 0.585

pH = 14 - pOH

      = 14 - 0.585

      = 13.415

Thus, the pH of the solution comes out to be 13.4.

b)

When 5 mL of HCl is added,

remaining moles of NaOH = 0.260 x 0.025 - 0.750 x 0.005

                                            = \(2.75*10^{-3}\) mol

Total volume = 0.025 + 0.005 = 0.03 L

[NaOH] = [OH-] = \((2.75*10^{-31})\)/0.03 = 0.092 M

pOH = -log [OH-]

        = - log (0.092)

        = 1.04

pH = 14 -pOH

     = 14 - 1.04

     = 12.96

Answer: 12.96

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Answer:

the atoms in a gas spread in all directions

Explanation:

:))

19.9 L volume of ammonia gas will be collected at 405 k and 2. 33 atm.

The vοlume οf ammοnia gas cοllected at 405 K and 2.33 atm, when 32.3 g οf magnesium nitride (Mg₃N₂) is used, is apprοximately 19.9 L.

Tο calculate the vοlume οf ammοnia gas, we need tο use the ideal gas law equatiοn:

PV = nRT

First, we need tο determine the number οf mοles οf magnesium nitride. The mοlar mass οf Mg₃N₂ is calculated as:

Mοlar mass οf Mg₃N₂ = (3 * atοmic mass οf Mg) + (2 * atοmic mass οf N)

Mοlar mass οf Mg₃N₂ = (3 * 24.31 g/mοl) + (2 * 14.01 g/mοl)

Mοlar mass οf Mg₃N₂ ≈ 100.94 g/mοl

Number οf mοles οf Mg₃N₂ = mass / mοlar mass

Number οf mοles οf Mg₃N₂ = 32.3 g / 100.94 g/mοl

Number οf mοles οf Mg₃N₂ ≈ 0.320 mοl

Nοw, we can use the ideal gas law equatiοn tο find the vοlume οf ammοnia gas:

V = (nRT) / P

V = (0.320 mοl * 0.0821 L·atm/(mοl·K) * 405 K) / 2.33 atm

V ≈ 19.9 L

Thus, 19.9 L volume of ammonia gas will be collected at 405 k and 2. 33 atm.

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170 K is the approximate normal boiling point for this substance as unknown substance is shown below.

Ordinary edge of boiling over is characterized as the temperature at which the fume tension of a fluid is equivalent to the barometrical strain. This thermo-actual property is critical to plan and estimation unit hardware of compound designing, for example, capacity tank, vessel, streak drum, refining section, etc.

The edge of boiling over is the temperature at which a substance goes from a fluid to a gas (or from a gas to a fluid). The direction of the heat transfer determines the nature of the phase change. Heat going into a substance transforms it from a string to a fluid or a fluid to a gas.

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Answer:

B) It is not balanced for oxidation state or for number of atoms

Explanation:

I got this question correct on my Edge quiz, so I know that this is the right answer.

The reactant side has 2 oxygen atoms, while the product side only has 1. This means the mass isn't balenced. In addition, the oxidation (charge) on the reactant side is 0, while it's -2 on the product side. This means the oxidation nor mass is balenced.

Hope that helps you!

Answer:

b

Explanation:

The size of micropipette that you would select to deliver 215 microliters would be a micropipette with a volume range of 200-1000 microliters.

What is a micropipette?

A micropipette is a laboratory instrument used to measure and dispense small volumes of liquid, typically in the range of microliters (µL) or nanoliters (nL). They are commonly used in chemistry, biology, and biochemistry experiments, as well as in clinical and industrial settings.

Micropipettes consist of a handle, a digital or manual volume adjustment mechanism, and a tip that is placed into the liquid to be dispensed. They work by creating a vacuum or positive pressure inside the tip, which draws or pushes the liquid out of the tip.

Micropipettes come in different volume ranges and it is important to select the right one to ensure accurate delivery of the desired volume. For example, a micropipette with a volume range of 2-10 microliters would not be suitable for delivering 215 microliters, while a micropipette with a volume range of 200-1000 microliters would be more appropriate.

It's also important to note that, even if the micropipette is able to deliver 215 microliters, you should always check the calibration of the micropipette before use, to make sure that it's delivering the correct volume.

Hence, a micropipette with a volume range of 200-1000 microliters is suitable to deliver 215 microliters.

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The binary compound formed from barium ions and fluoride ions would be BaF₂.

So, the correct answer is E.

This is because barium has a 2⁺ charge and fluoride has a 1- charge. In order to balance the charges, two fluoride ions are needed for every barium ion. The formula for this compound is BaF₂, where Ba represents barium and F represents fluoride.

This compound is a white, crystalline solid that is commonly used in the production of optical lenses and in the manufacturing of ceramics. It is also used in the dental industry as a material for fillings and crowns due to its high resistance to acid erosion and wear

Hence,the answer of the question is E.

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Answer:

Her speed is 6.8m/s.

Explanation:

K.E= 1/2mv²

or, 2543.2= 1/2×110×v²

or, 2543.2 = 55v²

or, 2543.2/55 = v²

or, 46.24 = v²

or, 6.8² = v²

v = 6.8 m/s

answer

6.8

explanation

k.e=1/2v^2

2543.2=55v^2

46.24=v^2

6.8^2=v^2

v=6.8

Answer:

9.3 g of Ca3(PO4)2

Explanation:

We'll begin by writing the balanced equation for the reaction. This is illustrated below:

3CaO + 2H3PO4 —> Ca3(PO4)2 + 3H2O

Next, we shall determine the number of mole of H3PO4 present in 200 cm³ of 0.3 mol/dm³ phosphoric acid (H3PO4) solution. This can be obtained as follow:

Molarity of H3PO4 = 0.3 mol/dm³

Volume = 200 cm³ = 200 cm³/1000 = 0.2 dm³

Mole of H3PO4 =?

Molarity = mole /Volume

0.3 = mole of H3PO4 /0.2

Cross multiply

Mole of H3PO4 = 0.3 × 0.2

Mole of H3PO4 = 0.06 mole

Next, we shall determine the number of mole of the salt, Ca3(PO4)2, obtained from the reaction. This can be obtained as shown below:

3CaO + 2H3PO4 —> Ca3(PO4)2 + 3H2O

From the balanced equation above,

2 moles of H3PO4 reacted to produced 1 mole of Ca3(PO4)2.

Therefore, 0.06 moles of H3PO4 will react to produce = (0.06 × 1)/2 = 0.03 mole of Ca3(PO4)2.

Thus, 0.03 mole of Ca3(PO4)2 is produced from the reaction.

Finally, we shall determine the mass of Ca3(PO4)2 produced as follow:

Mole of Ca3(PO4)2 = 0.03 mole

Molar mass of Ca3(PO4)2 = (40×3) + 2[31 + (16×4)]

= 120 + 2[31 + 64]

= 120 + 2[95]

= 120 + 190

= 310 g/mol

Mass of Ca3(PO4)2 =?

Mole = mass /Molar mass

0.03 = mass of Ca3(PO4)2 / 310

Cross multiply

Mass of Ca3(PO4)2 = 0.03 × 310

Mass of Ca3(PO4)2 = 9.3 g

Thus, 9.3 g of Ca3(PO4)2 was obtained from the reaction.

Answer:

Molarity(M) = 0.24M in (NH₄)₂Cr₂O₇.

Explanation:

By definition a solution is a homogeneous physical mixture of two substances, a solute (item in least amount) and solvent (item in greatest amount). Typically the solution is generally described in terms of the concentration of solute in solution (solute + solvent). Concentration is, by definition amount of solute divided the volume of solution. That is ...

concentration = amount solute / volume of solution

There are numerous unit expressions of concentration such as lbs/gal, lbs/ft³, grams/ml and molarity(M). For this problem, Molar Concentration following concentration definition is ...

Molarity(M) = moles solute / volume of solution in liters

moles of (NH₄)₂Cr₂O₇ = 30.05g/252.07g/mole = 0.12mole

Volume of Solution = 500ml = 0.500Liters

∴Molarity = [(NH₄)₂Cr₂O₇] = 0.12 moles / 0.500L = 0.24M in (NH₄)₂Cr₂O₇.

Note => the brackets [ ] around the formula (NH₄)₂Cr₂O₇ indicates Molar concentration.

Answer:

Tc

Explanation:

You just have to follow the rows with the exponents. Just remember that when we get to d, the number in the front is a period lower. Hope this helps!

Answer:

The specific shape that an electron moves in inside a sub-level shell.

Proper sample dilution, adherence to the countable range, and considering the limitations of plate count methods are crucial for obtaining reliable estimations of microbial counts in wastewater.

To determine if a sample has been diluted properly, you can consider several factors. Firstly, ensure that you have used the correct dilution factor. This factor represents the ratio of the volume of the original sample to the volume of the diluted sample. Using the appropriate dilution factor ensures that the sample falls within the countable range for accurate analysis. Secondly, the countable range for colony counts is typically between 30 and 300 colonies per plate. If the count falls outside this range, it may indicate that the sample was not diluted properly, and the dilution factor needs adjustment.

The estimation of the real count of wastewater using plate count methods provides an estimate rather than an exact count. Dilution and plating techniques are commonly used to estimate the number of viable microorganisms present in a sample. However, it's important to note that these methods have limitations. Not all microorganisms may grow under the specific incubation conditions or may be in a viable but non-culturable state, leading to an underestimation of the actual count.

The plate count number, in isolation, may not provide a complete understanding of the microbial population present. It is necessary to consider the statistical significance of the results by performing replicate plates, calculating average counts, and determining confidence intervals. Additionally, other methods, such as molecular techniques, can provide complementary information on microbial diversity and abundance.

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Answer:

c

Explanation:

the input of the mass is always equal to the mass of the outputs

Answer:

The correct answer is C

Explanation:

I did C like they said and it was correct!

Answer:

C. pH > pOH; Kw = 1.0 * 10^-14

Explanation:

The ion product of water, Kw = [H+]*[OH-] = 1.0 * 10^-14. It is a constant.

When an acid or base is added to water, its ion product does not change as it a constant. However, the relative concentrations of H+ ions and OH- ions will change depending on whether an acid or base is added to water.

When an acid is added to water, the concentration of H+ ions increases while that of OH- ions decreases, and vice versa.

Therefore, in the above situation where an acid is added to water, pH > pOH; Kw = 1.0 * 10^-14