the object in question 1 has a mass of 21.535g. what metal is the cylinder most likely made of? why? pls help asap!!

Answer:

1. NaCl

2. NH4F

3. MgO

4.LiCl

5. KI

6. CaO

Explanation:

In that order

It is a greenhouse gas. The greenhouse effect is caused by the absorption by the surface of the Earth and re-absorption by the atmosphere of the greenhouse gases (CH₄, CO₂, NO, CFCs ) in the environment.

What is the greenhouse effect?

The greenhouse effect is a natural process by which certain gases in the Earth's atmosphere, known as greenhouse gases, trap heat from the sun and prevent it from escaping into space. The greenhouse gases, which include carbon dioxide, methane, water vapor, and others, act like a blanket around the Earth, absorbing and re-emitting infrared radiation that would otherwise be lost to space. This process helps to keep the Earth's temperature within a range that is suitable for supporting life. However, human activities such as burning fossil fuels have increased the concentration of greenhouse gases in the atmosphere, leading to an enhanced greenhouse effect and causing the Earth's temperature to rise, a phenomenon known as global warming.

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The complete question and the labelled answer respectively, is as follows:

We know, change in temperature is given by :

\(T_2-T_1=\dfrac{q}{mC_p(Gold)}\)

Putting all given values, we get :

\(T_2-T_1=\dfrac{70\ cal}{20\ g\times 0.0310\ cal/g^o\ C}\\\\T_2-T_1=112.90^oC\\\\T_2-35^oC=112.90^oC\\\\T_2=(112.90+35)^oC\\\\T_2=147.9^oC\)

Hence, this is the required solution.

Explanation:

We have 2CO + O2 => 2CO2.

Moles of CO = 28.6g / (28g/mol) = 1.021mol.

Moles of CO2 = Moles of CO = 1.021mol.

Answer:

10.5%

Explanation:

The equation used to calculate mass percent by volume is:

                                        Mass Solute (g)
Mass/Volume %  =  -----------------------------------  x  100%
                                   Volume Solution (mL)

In this case, the solute is the glucose. You can plug the given values into the equation and solve.

                                      34.1 g C₆H₁₂O₆
Mass/Volume %  =  -------------------------------  x  100%
                                        325 mL soln

Mass/Volume %   =  0.105 x 100%

Mass/Volume %  =  10.5%

The amount of carbon dioxide in the air is increasing in a large city due to the growing number of vehicles. The mayor wants to plant more trees.  I totally agree with the mayor's suggestions.

Growing number of vehicles contributes towards carbon emissions into the atmosphere. Driving a car with gasoline as its fuel produces three carbon emissions. All of the emissions that take place across a company's value chain and are not covered by scope 2.

These emissions aren't caused by the business or the things it makes. Carbon emissions from operating a gasoline-powered vehicle are significant. Scope 3 applies since the product, not the company's machines, is what causes the emissions. There are three types of carbon emissions: 'Scope 1' or 'Direct Emissions' Direct GHG is produced at sources where the fuel is burned there and then. Examples of scope 1 emissions are personal automobiles and gas stoves. Planting more trees will result in minimizing the harmful effect of these gases upon the environment.

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Answer: A.) It is a compound

Explanation:

Water is an inorganic compound made of water molecules, which are made of oxygen and hydrogen atoms.

It is not an element because there is no such thing as a water atom.

Water is not a chemical reaction to anything.

Water is OBVIOUSLY not a metal.

Hope this helps :)

Answer:

The Boiling Point would be below a hundred degrees on a mountain than at sea level.

Explanation:

The Boiling Point is below a hundred degrees, because the air pressure at high altitudes is very low. ( -- < 100)

The Boiling Point for at sea-level would-be a hundred degrees because the air pressure is very high at lower altitudes.

First Model: is shown below, and it shows that the motion of thermal energy particles are moving fast when below 100 degrees ( -- < 100).

Second Model:  is shown below, and it shows that the motion of thermal energy are moving fast when at 100 degrees (--- = 100)

Hope this helps!

The Rf value for the blue component is approximately 0.333, and the Rf value for the red component is 0.2.

The Rf value, or the retention factor, is a ratio used in chromatography to quantify the migration distance of a component relative to the migration distance of the solvent front. It is calculated using the formula:

Rf = (distance moved by the component) / (distance moved by the solvent front)

Given the information provided:

Distance moved by the blue component = 5 cm

Distance moved by the red component = 3 cm

Distance moved by the solvent front = 15 cm

Now we can calculate the Rf values for the blue and red components:

Rf_blue = (distance moved by the blue component) / (distance moved by the solvent front)

        = 5 cm / 15 cm

        = 1/3

        ≈ 0.333

Rf_red = (distance moved by the red component) / (distance moved by the solvent front)

       = 3 cm / 15 cm

       = 1/5

       = 0.2

Therefore, the Rf value for the blue component is approximately 0.333, and the Rf value for the red component is 0.2.

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The answer is 39.2%.

Solution:

\(Yield = \frac{Observed yield}{Theoritcal yield}*100\)

= \(\frac{4.0}{10.2} *100\)

= 39.2%.

Theoretical yields are calculated based on the stoichiometry of the chemical formula. Actual yield is determined experimentally. Percent yield is determined by calculating the ratio of actual yield to theoretical yield. how much usable product is obtained after processing; how much crude product is actually ordered.

However, in practice, the actual product yield is almost always lower than the theoretical yield. The actual yield is the amount of product actually obtained and the theoretical yield is the maximum possible yield. There are several reasons why percentage returns may not be 100%. This is because some other unexpected reaction occurred that did not produce the desired product.

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Answer:

To convert joules to calories, you can use the conversion factor:

1 calorie = 4.184 joules

To find out how many calories are in 4,180 joules, divide the given value by the conversion factor:

4,180 joules / 4.184 joules per calorie = 0.9 calories (approximately)

Therefore, there are approximately 0.9 calories in 4,180 joules.

It is the 4th scenario is the dependent event. There are 7 gold tokens and 4 silver tokens in a cup. The first student randomly draws a gold token and keeps it. A second student randomly draws a gold token from the cup.

The fouth scenario is a dependent event because the probability of the second student drawing a gold token is affected by the outcome of the first student's draw.

If the first student draws a gold token, then there are only 6 gold tokens left in the cup, the probability changes. but  if the first student does not draw a gold token, then there are 7 gold tokens left in the cup, the probability will remain the same

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Answer:

Not to be rude but its in there. Hope this helps

Explanation:

Chemical weathering changes the molecular structure of rocks and soil. For instance, carbon dioxide from the air or soil sometimes combines with water in a process called carbonation. This produces a weak acid, called carbonic acid, that can dissolve rock.

The binding energy per nucleon for the ¹⁹F nucleon is equal to 7.786 MeV/nucleon.

Binding energy can be defined as the minimum quantity of energy that is required to remove the particle from the system. Nuclear binding energy can be described as the energy required to dismantle a nucleus of an atom into free neutrons and protons.

The binding energy will be determined from the mass defect. Mass defect is calculated from the difference between the mass observed and the expected combined mass.

Given the mass of the ¹⁹F = 18.9984 a.m.u.

The mass defect for the ¹⁹F can be calculated as:

Δm = \((M _n +M_p) - M_F\)

\(\triangle m =( 9\times 1.0078 + 10 \times 1.0087 )- 18.9984\)

\(\triangle m =0.1588 \;a.m.u.\)

The binding energy for the fluorine can be calculated as:

E = Δmc²

E = 0.1588 × 931.5

E = 147.92 MeV

The binding energy per nucleon of ¹⁹F can be calculated as:

B.E.N. = 147.92/18.9984 = 7.786 MeV per nucleon

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The energy in joules of one mole of photons of visible light having a wavelength of 4.11×10^2 nm? can be expressed as 2.9*10^5 J

From the question we were told to find the energy and the parameters that is needed to calculate these are;

c=3*10^8

h= 6.626 * 10^-34 J.s

1 mol photons = 6.023x10^23 photon

λ = 4.11×10^2 nm  = 4.11 × 10-7 meters

The parameters can be input  as Energy of one mole photon (E) = ( 6.023x10^23 * 6.626 * 10^-34 * 3*10^8)/ (4.11 × 10^-7)

=291302

=2.9*10^5 J

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The balanced nuclear equation for the β emission of the following isotopes is seen below:

92                 92                0

Sr            ⇒ Y         +   e

38                  39             -1

This is also known as beta decay in which a beta ray is emitted from an atomic nucleus.

The element formed during the beta emission of strontium is referred to as Yttrium.

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Explanation:

Silver hydroxide is almost an insoluble compound, its solubility product is 2*10^(-8). When it is in solution it dissolves like this way.

AgOH ----> Ag⁺ + OH⁻ Ksp = 2 * 10^(-8)

The expression for the solubilty product will be:

Ksp = [Ag+] * [OH-]

We are trying to dissolve the silver hydroxide in the silver nitrate solution. They have one ion in common, the silver cation (Ag+). Since the amount of silver hydroxide that can be dissolved is really small (because it is almost insoluble) we can consider that the concentration of the silver ion is governed by the concentration of the silver nitrate solution.

AgNO₃ ----> Ag+ + NO₃-

Since one molecule of silver nitrate has one nitrate ion we can say that the concentration of the silver ion will be the same as the concentration of the silver nitrate solution.

[AgNO₃] = [Ag+] = 0.270 M

Now that we know the concentration of the silver ion and the ksp, we can replace these values and find the concentration of the hydroxide ion.

Ksp = [Ag+] * [OH-]

[OH-] = Ksp/[Ag+]

[OH-] = 2 * 10^(-8)/(0.270 M)

[OH-] = 7.41 *10^(-8) M = [AgOH]

Answer: the maximum amount of silver hydroxide that will dissolve it 7.41*10^(-8) M

26.8L is the volume, in liters, of 1.20 mol of C\(_3\)H\(_8\) gas at STP. A measurement of three-dimensional space is volume.

A measurement of three-dimensional space is volume. It is frequently expressed quantitatively using SI-derived units, like the cubic metre or litre, or different imperial or US-standard units, including the gallon, quart and cubic inch. Volume and length (cubed) have a symbiotic relationship.

The volume of an envelope is typically thought of as its capacity, not as the amount of space it takes up. In other words, the volume is the quantity of fluid (liquid or gas) that the container may hold.

Volume = 1.20×22.4

              =26.8L

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The ΔS° value for the reaction KCl(s) → K+(aq) + Cl−(aq) is ΔS° > 0, as the products have a higher degree of disorder than the reactant due to an increase in the number of particles in solution. Hence the correct option is (C) ΔS° > 0.

The ΔS° value for a reaction represents the change in the entropy of the system, which is a measure of the disorder or randomness of the system. The reaction KCl(s) → K+(aq) + Cl−(aq) involves a solid compound breaking down into two separate aqueous ions, which means that the products have a higher degree of disorder than the reactant. This increase in the number of particles in solution results in an increase in entropy, which means that ΔS° > 0. Option (A) is incorrect because the reaction involves a change in state, which results in an increase in entropy. Option (B) is incorrect because it represents the relationship between enthalpy and entropy, not the ΔS° value for this particular reaction. Option (D) is incorrect because the reaction results in an increase in entropy, not a decrease. Option (E) is incorrect because the given information is sufficient to predict the sign of ΔS°.

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Answer:

B. Mixing a solute and a solvent

Explanation:

Hello,

In this case, solutions are defined as liquid homogeneous mixtures formed when two substances having affinity are mixed. It is important to notice that the two substances are known as solute, which is added to other substance that is the solvent. Therefore, answer is B. Mixing a solute and a solvent.

Notice that when two insoluble substances are mixed no solution is formed. Furthermore, if two solutes together or a solute and a precipitate are mixed, no liquid homogeneous solution is formed, as commonly solutes are solid, nevertheless, when liquid, one should have to act as the solvent.

Best regards.

Answer:

B. Mixing a solute and a solvent

Explanation:

ap3x

Answer:

89.6 F

Explanation:

Brain-List?

Mescaline produces a wide range of psychoactive effects when ingested, including altered perception of reality, hallucinations, and euphoria. It is a powerful psychedelic drug that has been used for centuries by Native American tribes in spiritual ceremonies

Mescaline is a hallucinogenic alkaloid that is derived from the Peyote cactus. Mescaline is a complex organic molecule that can be synthesized in the laboratory from 3,4,5-trimethoxybenzyl bromide in two steps.The first step involves nucleophilic substitution using sodium cyanide, and the second step is a reduction using lithium aluminum hydride (LAH).Here's how mescaline can be synthesized from 3,4,5-trimethoxybenzyl bromide:Step 1: Nucleophilic substitution using sodium cyanideThe reaction of 3,4,5-trimethoxybenzyl bromide with sodium cyanide results in the formation of the nitrile derivative. NaCN serves as the nucleophile in this reaction, and it replaces the bromide ion.The mechanism for this reaction involves the following steps: A nucleophilic attack by the cyanide ion on the benzyl bromide. The carbon-bromine bond breaks, and the benzyl cation is formed. A second nucleophilic attack by the cyanide ion occurs on the benzyl cation, resulting in the formation of the nitrile derivative.Here's the reaction equation for this step:Step 2: Reduction using lithium aluminum hydrideThe next step is the reduction of the nitrile derivative using LAH. LAH serves as a strong reducing agent in this reaction and reduces the nitrile derivative to the amine. The mechanism for this reaction involves the following steps: A nucleophilic attack by LAH on the nitrile derivative. This results in the formation of an imine intermediate. The imine intermediate reacts with another LAH molecule, resulting in the formation of the amine.Here's the reaction equation for this step:Mescaline structure: Mescaline is a psychoactive compound that belongs to the phenethylamine class of alkaloids. The structure of mescaline is as follows: The molecule has three methoxy groups attached to the benzene ring, and it has an amine functional group. The molecule is a white crystalline powder that is soluble in water and alcohol.

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Answer:

heptan-2-one

Explanation:

In this case, the final product would be a ketone: heptan-2-one. To understand why this molecule is produced we have to check the reaction mechanism.

The first step is the protonation of the triple bond to produce the more stable carbocation (a secondary one) by the action of sulfuric acid \(H_2SO_4\). The next step is the attack of water to the carbocation to produce a new bond between C and the O, producing a positive charge in the oxygen. Then, a deprotonation step takes place to produce an enol. Finally, we will have a rearrangement (keto-enol tautomerism) to produce the final ketone.

See figure 1

I hope it helps!

Answer:

False

True

True

False

False

True

Explanation:

Ideal behavior of gases is observed at high temperature and low pressure when the gas molecules are isolated from each other.

According to the kinetic theory of gases, gases occupy negligible volume and do not exert significant attractive forces on each other.

The average velocity of gases at constant temperature depends on molecular mass. Heavier molecules possess smaller average velocity than lighter molecules at constant temperature.

At constant temperature, molecules of different gases have the same average kinetic energy but different average velocities since they have different molecular masses. So, the average kinetic energy of gas molecules only depends on temperature.

The mass of lead based on data is 97.65 grams. The mean atomic mass of lead can be founded in periodic table of elements.

Given:

Therefore:

First, calculate the moles of lead.

\(\begin{array}{ll}\sf n &\sf = \dfrac{N}{L}\\\\&\sf = \dfrac{2.84\times 10^{23}}{6.02 \times 10^{23}} \\\\&\sf = 0.471~moles.\end{array}\)

Second, calculate the mass of lead.

\(\begin{array}{ll}\sf g&\sf = n \times Ar\\\\&\sf = 0.471 \times 207\\\\&\sf = 97.65~grams.\end{array}\)

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Answer:

ptic fiber communication and satellite communication are the leading technologies which are revolutionizing the world of telecommunications. Both technologies have their advantages and limitations which make them suitable for certain type of applications. This article will provide an overview of optic fiber and satellite communication technologies and present a comparison of the features and related issues.

Optic Fiber Communication

Optic Fiber communication transmits information by sending pulses of light (using laser) through an optic fiber. The low signal loss in optic fibers and high data rate of transmission systems, allow signals with high data rates (exceeding several Gbps) to travel over long distances (more than 100 km) without a need of repeater or amplifier. Moreover, using wavelength division multiplexing (WDM) allows a single fiber to carry multiple signals (upto 10 different signals) of multi-Gbps transmissions. Optic Fiber communication offers extremely high bandwidth, immunity to electromagnetic interference, non-existent delays and immunity from interception by external means. In the 1980s and 1990s, the continents were linked together using undersea optic fiber bringing about a paradigm shift in the global telecommunications.

These advancements in optic fiber communication has resulted in decrease of satellite communications for several types of communications. For instance, transmission between fixed locations or point-to-point communications, where large bandwidths are required (such as transoceanic telephone systems) are made through optic fiber instead of using satellite communication. Optic Fiber communication is also used to transmit telephone signals, Internet communication, LAN (Gigabit LAN) and cable television signals.

Satellite Communication

Satellite communications use artificial satellites as relays between a transmitter and a receiver at different locations on Earth. Satellite systems allow users to bypass typical carrier offices and to broadcast information to multiple locations. Communications satellites are used for radio, TV, telephone, Internet, military and other applications. There are more than 2,000 satellites around Earth’s orbit, being used for communication by both government and private organizations.

Communication Satellites are LOS (line-of-sight) microwave systems with a repeater. These satellites rotate around the earth with the speed of earth and are known as geostationary satellites. The limitations of antenna size also limits focusing capability making the coverage for a single satellite transmitter very large. This makes satellite communication ideal for TV and radio services as the signal has to flow from a single point to many points in a single direction. The large distance of satellites from the earth (about 22,300 miles) results in delays which adversely effects two-way communication like mobile conversations. Low earth orbit satellites can be used for two-way mobile communication because less power is required to reach those satellites.

Explanation:

Answer:

1.41 moles H2O2(with sig figs)

Explanation:

okay so what is the molar mass of H2O2= (1.008 g/mol)2+(16.00g/mol)2= (2.016+ 32.00) g/ mol

= 34. 02 g/mol

48.0g H2O2* 1 mol H2O2/ 34.02 g H2O2= 1.41 mol H2O2