what will be the effect on the amount of gas produced if the experiment is repeated using 0.35 g of k(s) instead of 0.35 g of li(s) ?

Aligning the cuvet in the sample hold measurement er the same way each time is important to ensure that the optical windows are correctly positioned in the light path, allowing accurate of absorbance.

Both of the given statements are correct, and aligning the cuvet in the sample holder the same way each time is indeed important for accurate measurements in spectrophotometry.

1. Only two sides are transparent: Cuvets, or cuvette cells, are typically rectangular or square-shaped containers made of glass or plastic. They have two transparent sides, known as optical windows, through which light passes. The other sides are opaque. If the cuvet is placed incorrectly in the sample holder, such that the optical windows are not aligned with the light path, it will block or obstruct the passage of light, resulting in an incorrect measurement of absorbance. Consistent alignment ensures that the light passes through the cuvet properly and allows accurate determination of the absorbance of the sample.

2. Minimize the effect of imperfections: The glass or plastic material used to make cuvets may have minor imperfections, such as scratches or impurities. These imperfections can cause variations in the transmission of light through the cuvet. By aligning the cuvet in the same way each time, any effects caused by the imperfections can be minimized or averaged out, leading to more reliable and consistent results. In this way, consistent alignment helps to reduce potential errors or inconsistencies in the measurements caused by the cuvet itself.

In summary, aligning the cuvet in the sample holder the same way each time is important to ensure that the optical windows are correctly positioned in the light path, allowing accurate measurement of absorbance. Additionally, consistent alignment helps to minimize any effects caused by imperfections in the cuvet material, resulting in more reliable and consistent measurements.

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Answer: A forest

Explanation:

Moss are more likely to be found in moist shady locations. They are best known for those species that carpet woodland and forest floors.

Answer:

The volume of the tank can be calculated using the ideal gas law, which states that PV = nRT, where P is pressure, V is volume, n is the number of moles of gas, R is the ideal gas constant, and T is temperature.

In this case, we have P = 179 atm, n = 7.75 moles, R = 0.08206 Latm/(Kmol), and T = 295 K. Plugging these values into the ideal gas law equation and solving for V gives us:

V = (nRT)/P V = (7.75 moles * 0.08206 Latm/(Kmol) * 295 K) / (179 atm) V ≈ 1.01 L

So the volume of this tank at these conditions is approximately 1.01 liters.

Explanation:

Answer:

Volume = 1.05 L (3 s.f.)

Explanation:

To find the volume of the tank, we can use the ideal gas law.

\(\boxed{\sf PV=nRT}\)

where:

The given values are:

Substitute the given values into the formula and solve for V:

\(\implies \sf 179 \cdot V=7.75 \cdot 0.082057366080960\cdot 295\)

\(\implies \sf V=\dfrac{7.75 \cdot 0.082057366080960\cdot 295}{179}\)

\(\implies \sf V=\dfrac{187.6036532 \dots }{179}\)

\(\implies \sf V=1.04806510 \dots\;L\)

\(\implies \sf V=1.05\;L\;(3\;s.f.)\)

Therefore, the volume of the tank in these conditions is 1.05 liters (3 s.f.).

Answer:

B and C

Explanation:

saturated hydrocarbons contain only single bonds between carbon atoms

hope this help!

The rate of the reaction when the fumarate concentration is 1.2 mM and the amount of enzyme is 100 micrograms is approximately 0.975 mmol-min-1 per mg enzyme.

The rate of the reaction can be calculated using the Michaelis-Menten equation:

\(V = (Vm * [S]) / (Km + [S])\)
Where:
V is the rate of the reaction
Vm is the maximum velocity (2.6 mmol-min-1 per mg enzyme)
[S] is the substrate concentration (1.2 mM)
Km is the Michaelis constant (2.0 mM)

By substituting the values into the equation, we can find the rate of the reaction:

V = (2.6 mmol-min-1 per mg enzyme * 1.2 mM) / (2.0 mM + 1.2 mM)
V = (3.12 mmol-min-1 per mg enzyme) / (3.2 mM)
V ≈ 0.975 mmol-min-1 per mg enzyme

Therefore, the rate of the reaction when the fumarate concentration is 1.2 mM and the amount of enzyme is 100 micrograms is approximately 0.975 mmol-min-1 per mg enzyme.

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Answer:

A mirror fog doesn’t fog up from a far distance because it does not have the circumstances to fog up. It must be at the same distance.

The fog in the mirror is the condensation of water vapor as it touches a colder surface. By running cold water you just cool down the bath tub and everything around it. Now the vapor coming from the hot shower will mostly condense right there and will not reach the mirror.

HCl(aq) would be expected to see written as separated ions in an ionic equation.

When HCl is dissolved in water, it ionizes completely to form H+ and Cl- ions, which are free to move around in solution. Therefore, in an ionic equation, HCl(aq) would be written as H+(aq) + Cl-(aq).

In contrast, H2(g), H2O(l), and H2S(g) are covalent compounds that do not ionize in water, so they would not be written as separated ions in an ionic equation.

Answer:

A. Reduced precipitation is the cause of drought.

Explanation:

Reduced precipitation begins to insufficient water availability because water catch basins or tanks tend to dry out. When it drains out, people tend to start working and drying out the backup water sources and stored ones. Until such time, that the reservoirs of water will completely be dried out. And there will be no more water for them to use and there will be a drought.

hope this helps

Answer:

Option A

Explanation:

NOExplanation:

I DONT KNOW MATE

Answer:

A positive and a negative ion.

Explanation:

Answer:

The difference between an atom and an ion has to do with net electrical charge. An ion is a particle or collection of particles with a net positive or negative charge. ... A stable atom contains the same number of electrons as protons and no net charge. When electrons are added or removed, the stable atom becomes an ion.Apr 12, 2015

Explanation:

hope this helps ✌️

A confidence interval can estimate the true mean of insect fragments per portion, while the margin of error measures precision, and sample size determines the required accuracy.

(a) Confidence Interval: To estimate the true mean number of insect fragments per ten-gram portion, a confidence interval can be calculated. Assuming a normal distribution, we can use the sample mean (x = 5.9) to determine the range within which the true population mean lies. With a simple random sample of 50 portions, we can use the t-distribution for small sample sizes.

Choosing a desired confidence level, such as 95%, we calculate the standard error using the sample standard deviation and find the t-value for the corresponding degrees of freedom. With these values, we can construct the confidence interval as x ± t * (s/√n). The resulting interval provides a range in which we can be confident the true population mean lies.

(b) Margin of Error: The margin of error measures the maximum expected difference between the sample mean (x = 5.9) and the true population mean. It is calculated by multiplying the standard error by the critical value corresponding to the chosen confidence level.

This provides an estimate of the precision of our sample mean as an approximation of the true population mean. A smaller margin of error indicates a more accurate estimation of the population mean.

(c) Sample Size Determination: The sample size required to estimate the population mean with a desired level of precision can be determined using the formula\(n = (Z * \alpha / E)^2\).

Here, Z is the critical value corresponding to the desired confidence level, σ represents the estimated standard deviation, and E is the desired margin of error.

By plugging in the respective values, we can solve for the required sample size. A larger sample size will result in a smaller margin of error, increasing the precision of the estimate.

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Answer:

600 grams

Explanation:

The value of the mole is equal to the number of atoms in exactly 12 grams

12x50=600

Answer:

I can't draw diagrams on this web site but I can do with numbers I think. So an electron is moved from n = 1 to n = 5. I'm assuming I've interpreted the problem correctly; if not you will need to make a correction. I'm assuming that you know the electron in the n = 1 state is the ground state so the 4th exited state moves it to the n = 5 level.

n = 5 4th excited state

n = 4 3rd excited state

n = 3 2nd excited state

n = 2 1st excited state

n = 1 ground state

Here are the possible spectral lines.

n = 5 to 4, n = 5 to 3, n = 5 to 2, n = 5 to 1 or 4 lines.

n = 4 to 3, 4 to 2, 4 to 1 = 3 lines

n = 3 to 2, 3 to 1 = 2 lines

n = 2 to 1 = 1 line. Add 'em up. I get 10.

b. The Lyman series is from whatever to n = 1. Count the above that end in n = 1.

c.The E for any level is -21.8E-19 Joules/n^2

To find the E for any transition (delta E) take E for upper n and subtract from the E for the lower n and that gives you delta E for the transition.

So for n = 5 to n = 1, use -Efor 5 -(-Efor 1) = + something which I'll leave for you. You could convert that to wavelength in meters with delta E = hc/wavelength. You might want to try it for the Balmer series (n ending in n = 2). I think the red line is about 650 nm.

Explanation:

Answer:

\(\boxed {\boxed {\sf 142.2 \ K}}\)

Explanation:

This problem asks us to find the temperature change necessary to make the volume change. We use Charles's Law which states that temperature is directly proportional to the volume of a gas. The formula is:

\(\frac{V_1}{T_1}=\frac{V_2}{T_2}\)

We know the balloon originally had a volume of 6.5 liters and a temperature of 280 Kelvin. Then, the temperature was cooled so the new volume is 3.3 liters. However, the exact new temperature is unknown.

Substitute all known values into the formula.

\(\frac {6.5 \ L}{280 \ K}=\frac{3.3 \ L}{T_2}\)

Now, solve the new temperature (T₂). First, cross multiply. Multiply the 1st numerator by the 2nd denominator. Then, multiply the 1st denominator by the 2nd numerator.

\(280 \ K * 3.3 \ L = 6.5 \ L * T_2\)

Multiply the left side.

\(924 \ K *L=6.5 \ L *T_2\)

We must isolate the variable. Currently, it is being multiplied by 6.5 liters. The inverse of multiplication is division. Divide both sides by 6.5 L.

\(\frac { 924 \ K*L}{6.5 \ L}= \frac{ 6.5 \ L *T_2}{ 6.5 \ L}\)

\(\frac { 924 \ K*L}{6.5 \ L}= T_2\)

The units of liters (L) cancel.

\(\frac { 924 \ K}{6.5 }= T_2\)

\(142.153846 \ K= T_2\)

Let's round to the nearest tenth place. The 5 in the hundredth place tells us to round the 1 up to a 2.

\(142.2 \ K= T_2\)

The temperature must be cooled to approximately 142.2 Kelvin.

When salt is dissolved in water, B. the positively charged sodium cation is surrounded by the negative side of encircling water molecules.

This is because water is a polar molecule, meaning it has both a positive and negative side. The oxygen atom in water has a partial negative charge, while the hydrogen atoms have a partial positive charge. When salt (NaCl) is added to water, the positive sodium cation (Na+) is attracted to the negative oxygen side of water molecules, forming a hydration shell around the ion.

The negative chloride ion (Cl-) is attracted to the positive hydrogen side of water molecules, forming its own hydration shell. This process is called hydration, and it helps to stabilize the ions in solution and prevent them from re-forming into salt crystals. The surrounding water molecules form hydrogen bonds with each other and with the hydrated ions, resulting in a homogeneous solution of saltwater. So therefore the correct answer is B. the positively charged sodium cation is surrounded by the negative side of encircling water molecules, when salt is dissolved in water.

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Answer:

significantly increase human productivity

Explanation:

hope this help

The detailed answer of this question is given below:-

Friedel-Crafts acylation is an electrophilic aromatic substitution reaction in which an acyl halide reacts with an aromatic ring to form an aromatic ketone. The mechanism for the generation of the electrophile involves the reaction of the acyl halide with an electron-rich Lewis acid, such as AlCl3, to form a species known as the acylium ion.

The reaction can be depicted as follows:

The acyl halide reacts with AlCl3 to form the acylium ion:

RCOCl + AlCl3 → RCO+ + AlCl4-

The acylium ion acts as the electrophile, attacking the electron-rich aromatic ring to form an intermediate carbocation:

RCO+ + ArH → RCO+Ar-

The intermediate carbocation rearranges, if necessary, to the most stable form, and protonates to form the final product, an aromatic ketone:

RCO+Ar- → RC(O)Ar + H+

In this mechanism, the acyl halide serves as the source of the acyl group, which is transferred to the aromatic ring via the electrophilic attack by the acylium ion. The Lewis acid, AlCl3, serves to generate the electrophile, while the protonation step at the end forms the aromatic ketone.

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Answer:

-342kj

Explanation:

Just did the test.

1 mole of Fe by the reverse reaction The correct answer is D. 684 k.

Mole is a unit of measurement used in chemistry to measure the amount of a substance. The mole is equal to the atomic mass of a substance expressed in grams. It is used to measure the amount of a substance, usually in moles per liter. The mole is also used to calculate the number of atoms, molecules, and other particles in a given volume or mass. The mole is an important concept in chemistry, and is used in many calculations related to chemical reactions, such as the calculation of molecular weights, reaction rates, and stoichiometry.

The reverse reaction of Fe (s) + Cl2 (g) → FeCl2 (s) is FeCl2 (s) → Fe (s) + Cl2 (g). The change in enthalpy (ΔH) is the amount of energy released or absorbed in a chemical reaction. In this case, the reaction has a ΔH of -342 kJ, meaning that 342 kJ of energy is released. To produce 1 mole of Fe by the reverse reaction, 684 kJ of energy must be absorbed, which is equal to twice the ΔH of -342 kJ. Therefore, the correct answer is D. 684 kJ.

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Answer:  1 cm = 100m

Explanation:  Centi- is the prefix used to designate 0.01 (one hundredth) of something.  1 cm means 0.01 m.

1 cm = 100 m  is NOT a correct conversion factor. Option C is correct.

The conversion factors are the factors that re-use to convert some values from unit to unit of another value like from centimeter to meter from meter to kilometer from milligram to gram.

In one centimeter it is the suffix used to denote it is the one by hundred value of the on meter or which is equal t one meter so, 1cm = 0.01 meters as it is the 1/100 part f the one-meter distance.

Therefore, Option C is correct. 1 cm = 100 m  is NOT a correct conversion factor.

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We have the total of 12 valence electrons for the H₂CO Lewis structure.  starting by putting the Carbon in  middle, and then the Hydrogens always go on  outside, and then the Oxygen will go upwards. . We have 12 valence electrons.

We'll put 2 between atoms to form the chemical bonds and then on  the outside to fill the octet of the Oxygen. So we just have the 2, 4, 6, 8, 10, and 12 electrons. At this point, everything has the full outer shell except the Carbon, which only has  six valence electrons. We can take these 2 valence electrons to from Oxygen and then  the share them to form the double bond. Now the Oxygen has 8 valence electrons, still has 8, but  Carbon has 8.  Thus ,the Hydrogens, it only need 2 for a full outer shell, so they're fine.

So in  Lewis structure for H₂CO, it has completed the octets for each of the atoms, and where only 12 valence electrons are used.

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I think its nitrogen, im not sure tho

Increasing temperature decreases the solubility of gases. Decreasing temperature decreases the solubility of solids. Increasing pressure increases the solubility of gases.

Temperature: The effect of temperature on solubility depends on the nature of the solute and solvent.

Stirring: Stirring or agitating a mixture can enhance the rate at which a solute dissolves in a solvent. It helps maintain a concentration gradient, ensuring fresh solvent contacts the solute surface, allowing for a faster dissolution process.

Pressure: The effect of pressure on solubility varies based on the nature of the solute and solvent.

Amount of solvent: The amount of solvent does not directly affect the solubility of solutes. Solubility is typically expressed in terms of the amount of solute that can dissolve in a given amount of solvent under specific conditions.

Thus, it's important to note that these are general trends and may vary depending on the specific solute-solvent system.

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The phases of matter in order from the strongest collective electrostatic forces to the weakest collective electrostatic forces is solid, liquid, gas. Therefore, option C is correct.

A state of matter is one of the various forms that matter can take. In everyday life, four states of matter are visible: solid, liquid, gas, and plasma.

When compared to liquids and gases, solids typically have the strongest intermolecular forces. Because the particles in solids are closely packed, they are incompressible and have a high density.

Solids with high order have the strongest intermolecular interactions, while gases with high disorder have the weakest.

Thus, option C is correct.

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Answer:

volume =40.0 ml

Explanation:

density = mass/ volume

volume = mass/ density

volume = 108/ 2.70

volume =40.0 ml

Answer: 2150000 cm

Explanation:

Hey there!

In order to find the answer you have to MULTIPLY the kilometers (km) [21.5] from 100,000 and then you should be able to find your answer in centimeters (cm)

21.5 km * 100,000 = ? cm

Simplify that equation:

cm = 2,150,000

Therefore, your answer should be: 2,150,000

Good luck on your assignment & enjoy your day!

~Amphitrite1040:)

Answer:

45

Explanation:

kasi madali lng sya buhatun dpat paning kamotan nimo na sili kay magsalig ka sa brainly dahh

Answer:

Double replacement:

Explanation:

Double replacement:

It is the reaction in which two compound exchange their ions and form new compounds.

AB + CD → AD +CB

Chemical equation:

CaCO₃ + 2HCl    →      CaCl₂ + H₂CO₃

The given chemical reaction is example of double displacement reaction. In this type of reaction cation and anion of both reactant exchange with each other. We can see carbonate ion of calcium carbonate combine with hydrogen ion of HCl and form carbonic acid while chloride ions of HCl combine with calcium ion and form calcium chloride.

All other options are incorrect because,

Single replacement:

It is the reaction in which one elements replace the other element in compound.

AB + C → AC + B

Decomposition reaction:

It is the reaction in which one reactant is break down into two or more product.

AB → A + B

Combustion reaction:

In combustion reaction substances are burned in the presence of oxygen.

Answer:

double-displacement

Explanation:

I took the test :)