Aluminum finds application as a foil for wrapping food stuves. Why?

The effect on the amount of gas produced is that if the experiment is repeated using 0.35 grams of potassium is that less amount of hydrogen gas is liberated.

When  potassium reacts with water it liberates hydrogen gas and potassium hydroxide is formed.

[tex]2K+3H_2O\rightarrow2H_2+2KOH[/tex]

When lithium reacts with water it liberates hydrogen gas and lithium hydroxide is formed.

[tex]2Li+3H_2O\rightarrow2H_2+2LiOH[/tex]

Moles in case of each reaction can be calculated by the formula ,

                     n=W/M

where W =mass and M=molar mass

therefore, moles of potassium  are ,0.35 g/39=0.0089

and moles of lithium are,0.35 g/6.9=0.0507

Since the amount of moles produced when lithium metal is used is more as compared to potassium ,lithium will produce more gas.Thus,on replacing lithium with potassium less gas will be produced.

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The transformation could take place at the cathode of a voltaic cell is (d) F- to F2.

What is a voltaic cell?

Electrons can move from one reaction to the other thanks to a wire that connects the two processes. We have therefore produced a voltaic/galvanic cell. A voltaic cell, often called a galvanic cell, is an electrochemical device that produces electricity through uninhibited redox processes. It is divided into two distinct half-cells.

A polarised electrical device's cathode is the electrode from which a regular current exits. The abbreviation CCD, which stands for Cathode Current Departs, might be used to remember this definition. Positive charges move in the direction described by a conventional current.

The transformation could take place at the cathode of a voltaic cell is (d) F- to F2.

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Answer:

CO2 and H2O

Explanation:

CO2 and H2O are both compounds

Answer: samples of gaseous argon and solid iron in the same container

The independent variable, also known as manipulated, is the one that changes and causes an effect on the depenedent variable. The manipulated variable is temperature. Option D.

Independent variables are those modified or changed by the researcher to study how this change affects another variable (the dependent one) and hence the results.

It also receives the name of the manipulated variable because the researcher alters its value or state to analyze its effect. These variables are voluntarily manipulated by the researcher.

In the exposed example,

Goal: To determine the effect of temperature on reaction rates.

Independent (manipulated) variable: Temperature

Dependent variable: time it takes the tablet to dissolve.

Temperature is what affects the time in which the tablet dissolves. The researcher changes temperature levels to analyze how much the time changes.  

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Complete question,

A group of students conducts an experiment to determine the effect of temperature on reaction rates. They perform three separate trials in this experiment.

In the first trial, they drop an antacid tablet into a beaker of water at a temperature of 40 °C and record how long it takes the tablet to completely dissolve.

In the second and third trials, they use the same type and amount of antacid, but they change the temperature of the water to 25 °C for the second trial and 5 °C for the third trial.

The manipulated variable in this experiment is the

A. type of antacid used

B. amount of antacid used

C. time it takes for the reaction to occur

D. temperature at which the reaction occurs

Explanation:

Krypton because it's inert gas

Majority carrier concentration in a semiconductor is expressed as n0 = (ni)2/M, or Majority Carrier Electron Concentration = (Intrinsic Carrier Concentration)2/Minority Carrier Concentration.

What is equilibrium carrier concentration?

The equilibrium carrier concentration is the total number of carriers in the conduction and valence band. A constant is the result of minority and majority charge carriers. The equilibrium carrier concentration is defined as the total number of carriers in the conduction and valence bands without any external influence.

Majority carrier concentration in a semiconductor is expressed as n0 = (ni)2/M, or Majority Carrier Electron Concentration = (Intrinsic Carrier Concentration)2/Minority Carrier Concentration. It is defined as the equilibrium carrier concentration, which is equal to the intrinsic carrier concentration plus the number of free carriers added by doping the semiconductor.

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On its website, the epa claims that sulfur dioxide levels have fallen by 85 between 1990 and 2016.

What is SO2?

The national ambient air quality criteria for SO2 set by the EPA are intended to guard against exposure to all sulphur oxides (SOx). The most concerning component, SO2, serves as a marker for the larger group of gaseous sulphur oxides (SOx). At far lower quantities than SO2, the atmosphere contains other gaseous SOx (such SO3).

The largest source of SO2 in the atmosphere is the combustion of fossil fuels by power plants and other industrial facilities.

State and local governments will be able to comply with the EPA's national and regional rules to reduce emissions of SO2 and pollutants that create sulphur oxides (SOx) and assist them achieve the Agency's national air quality goals.

Now, So2 concentration in 1990 = 124 ppb

So2 concentration in 2016 = 16 ppb

Thus decrease in concentration of so2 is 108 ppb

Hence, decrease percentage = 87.09 % (ans)

Thus the claims are accurate.

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Answer:

any particle that isn't a proton

Explanation:

According to catastrophists the rate of geological change is slow incremental changes

The catastrophic idea holds that severe, abrupt events with potentially global reach have formed the Earth in substantial part.  Contrast this with uniformitarianism, sometimes known as gradualism, which postulates that all of the Earth's geological features were produced through slow, incremental processes like erosion. Uniformitarians believed that all geological processes, including erosion, were identical throughout history and that the present held the key to understanding the past. Since the initial disagreements, a broader and more comprehensive understanding of geologic events has emerged. The scientific community now acknowledges that there have been some catastrophic events in the past, but that these can be explained as extreme instances of natural processes that can take place.

What is geological change?

dynamic activities or events that take place on the surface of the Earth as a result of the impact of natural factors like wind, moving water, ice, and snow, temperature changes, freezing and thawing, chemical reactions, seismic shaking, and the application of gravity. When a force is greater than the earth's material can withstand, it deforms, moves, or undergoes chemical reactions.

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An individual takes in 2,000 ml of water during the day. Ideally, they should lose 2,000 ml of water during the day.

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The name of N2CI4 is Dinitrogen tetrachloride.

I determined the bond type because there was no metal in the formula, and I determined the name by taking the prefixes of the subscripts and adding them to the elements. Since both nitrogen and chlorine want to gain electrons. we can obey the octet rule with a compromise of neither losing nor gaining electrons.

Two atoms share electrons to achieve the octet rule and form a covalent bond. Accordingly, the indicated compounds are covalent compounds. Explain what is most likely to happen when an atom of this element approaches an atom with seven valence electrons. Move to the outermost shell. Because both fluorine and hydrogen can only form ionic bonds.

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Answer:

It is approximately equal to the number of protons and neutrons, with a little extra added by the electrons.

Explanation:

Lauren needs the information like mass of each substance respect to its volume in order to estimate the density of each liquid that creates the layers of colors.

Lauren can calculate density by the formula

Density = Mass/ Volume

According to the densities, the liquid that has a density less than that of water, it will float in water.

Whereas the objects or liquids that have a density more than that of water, it will sink to the very bottom.

A liquid’s density is a gauge of how heavy it is relative to the amount being measured. The liquid that weighs heavier is denser if you weigh two liquids with similar volumes or amounts.

A substance that is less dense than water will float if it is gently introduced to the water’s surface. Like a solid, a liquid’s density is determined by dividing its mass by its volume, or D = m/v. Water has an average density of one gram per cubic centimeter.

Liquids have particles that are closely spaced. Liquids have high densities because, although being randomly arranged, they are tightly packed.

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Yes, despite of how high or low you are, gravity exerts a force on you that can be measured.

The weight appears to grow as the individual moves upward because the weight scale's usual force on them increases. When the elevator descends, the opposite is true.

Weight is determined by the force applied to the load cell of weighing scales and balances. They then translate the outcome into mass and present it in several mass units.

An instrument used to calculate an object's weight or mass is a weighing balance. It is a necessary equipment in laboratories, commercial kitchens, and pharmacies and is offered in a variety of sizes with various weighing capacities.

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The quantity of heat released in kJ when 15.7 g of benzene in the liquid phase at 50.0 °C is converted to solid benzene at 2.0 °C is 3.32 kJ.

The quantity of heat released is calculated using the formula below:

The following values apply to benzene:

Moles of benzene = 15.7/78/11 = 0.20 moles

Heat evolved from 50 °C to 5.4 °C = 15.7 * 1.8 * (50 - 5.4) = 1260.4 J = 1.26 kJ

Latent heat of fusion = 0.2 * 9.9 = 1.98 kJ

Heat evolved on cooling from 5.4 °C to 2.0 °C = 15.7 * 1.51 * (5.4 - 2.0) = 80.6  J = 0.08 kJ

quantity of heat released = 1.26 + 1.98 + 0.08 = 3.32 kJ

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the point in time when a solid transitions from a solid to a liquid at a fixed pressure, usually standard pressure. The temperature at which a substance transitions from a solid to a liquid state is known as its melting point (or, less frequently, liquefaction point). Pressure affects a substance's melting point, which is typically reported at a standard pressure such as 1 atmosphere or 100 kPa.

the temperature, at any given fixed pressure, at which a solid and its liquid are in equilibrium.

The temperature at which a substance melts when heated is known as its melting point.

the degree to which a solid becomes liquid. When compared to the freezing point,

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The probability of getting 2 nickels, 2 dimes, and 1 quarter is; 0.1264

The area of mathematics known as probability deals with numerical descriptions of how likely it is for an event to happen or for a claim to be true. The probability of an occurrence is a number between 0 and 1, with 1 representing certainty and 0 representing impossibility of the event.

 The higher the probability of an event, the more probable it is to occur. Tossing a fair (unbiased) coin is a straightforward illustration. Since there are no other possible outcomes and the coin is fair, the probability of both "heads" and "tails" is half. Since there are no other conceivable outcomes, the probability of either "heads" or "tails" is equal to one.

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Answer:  yes it is right.

Explanation:

Answer:  Correct

Explanation:

The following as an element, a compound, a homogeneous mixture, or a heterogeneous mixture:

(a) a milkshake: heterogeneous mixture

(b) air in a bottle: homogeneous mixture

(c) concrete: heterogeneous mixture

(d) helium gas: element

Whether a mixture is solid, liquid, or gaseous, homogeneous mixtures have the same ratios of their component constituents throughout a particular sample. Its composition stays the same throughout. There is just one observable phase of substance in a homogeneous mixture.

Due to the dispersion of fat particles throughout the milk and the fact that sugars are dissolved in the water portion, milk is used as an example of both a homogeneous mixture and a heterogeneous mixture.

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The complete question is -

Classify each of the following as an element, a compound, a

homogeneous mixture, or a heterogeneous mixture:

(a) helium gas:

(b) a milkshake:

(c) air in a bottle:

(d) concrete:

The ground state is the lowest energy state of the atom.

We know that the electron configuration has to do with the manner in which electrons are arranged in an atom. The ground state is the lowest energy state of the atom. The atom could move to higher energy states by absorbing energy sometimes in the form of heat or light.

The ground state has to do with the lowest energy state of the atom and according to the Bohr theory, the atom could acquire energy and move from this lowest energy state to higher energy states. The higher energy states are short lived and the electron returns to the ground state.

We want to show the ground state of each of the atoms as shown in the question;

N - [tex]1s^{2} 2s^{2} 2p^{3}[/tex]

S - [tex]1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 4s^{2} 3d^{10} 4p^{4}[/tex]

Rh - [tex]1s^{2} 2s^{2} 2p^{6}3s^{2} 3p^{6} 4s^{2} 3d^{10} 4p^{6} 5s^{1} 4d^{8}[/tex]

Thus, these are the ground state electron configurations of the nitrogen, sulfur, and rhenium atoms shown above respectively.

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You need the Ka value of butanoic to do this (Ka = 1.51 x 10^-5).

5.9/88 = mol butanoic acid = 0.067…mol

so [C4H8O2] = 0.067… mol/L ([ ] conc in mol/L)

Ka = [H+][C4H7O2-] /[[C4H8O2] ] assume

[H+] at eqm = [C4H7O2-] at eqm and [C4H8O2] at eqm is same as acid originally (fair assumption as it hardly dissociates)

then [H+] = sqroot of Ka[C4H8O2] and the pH is the -log of this.

gives an ans of 3.00 to 3sf

What is acid?

Atomicity, consistency, isolation, and durability (ACID) is an acronym and mnemonic for the four key characteristics that a transaction manager ensures for every transaction (which is also called a transaction monitor). These qualities include atomicity.

Therefore,

You need the Ka value of butanoic to do this (Ka = 1.51 x 10^-5).

5.9/88 = mol butanoic acid = 0.067…mol

so [C4H8O2] = 0.067… mol/L ([ ] conc in mol/L)

Ka = [H+][C4H7O2-] /[[C4H8O2] ] assume

[H+] at eqm = [C4H7O2-] at eqm and [C4H8O2] at eqm is same as acid originally (fair assumption as it hardly dissociates)

then [H+] = sqroot of Ka[C4H8O2] and the pH is the -log of this.

gives an ans of 3.00 to 3sf

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Answer:

You need the Ka value of butanoic to do this (Ka = 1.51 x 10^-5).

5.9/88 = mol butanoic acid = 0.067...mol

so [C4H8O2] = 0.067... mol/L ([] conc in mol/L)

Ka = [H+][C4H702-]/[[C4H8O2]] assume

[H+] at eqm = [C4H702-] at eqm and [C4H8O2] at

eqm is same as acid originally (fair assumption as it hardly dissociates)

then [H+] = sqroot of Ka[C4H8O2] and the pH is the -log of this.

gives an ans of 3.00 to 3sf

What is acid?

Atomicity, consistency, isolation, and durability (ACID) is an acronym and mnemonic for the four key characteristics that a transaction manager ensures for every transaction (which is also called a transaction monitor). These qualities include atomicity.

Therefore,

You need the Ka value of butanoic to do this (Ka =

1.51 x 10^-5).

5.9/88 = mol butanoic acid = 0.067...mol

so [C4H802]=0.067... mol/L ([] conc in mol/L)

Ka = [H+][C4H702-]/[[C4H8O2]] assume

[H+] at eqm = [C4H702-] at eqm and [C4H8O2] at eqm is same as acid originally (fair assumption as it

hardly dissociates)

then [H+] = sqroot of Ka[C4H8O2] and the pH is the

-log of this.

gives an ans of 3.00 to 3sf

The amount of water that must be evaporate from 500 grams of a 10% salt solution to obtain a 15% salt solution is: 166.67 g

To solve this problem, the formula and the procedure that we have to use is:

c1 * m1 = c2 * m2

Where:

Information about the problem:

Applying the dissolution of concentrations formula, we get:

c1 * m1 = c2 * m2

10% * 500g = 15% * (500 g - x)

0.10 * 500g = 0.15*(500g - x)

50 g = 75g - 0.15x

Isolating the (x) variable, we have:

0.15x = 75g - 50 g

0.15x = 25g

x = 25g / 0.15

x = 166.67 g

In chemistry a solution is known as a homogeneous mixture of two or more components called:

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Cl and Br have similar properties as they belong to halogen family.

Halogen, any of the six nonmetallic elements that constitute Group 17 (Group VII A) of the periodic table. The halogen elements are fluorine (F), chlorine (Cl), bromine (Br), iodine (I), astatine (At), and (Ts). They were given the name halogen, from the Greek roots Hal- (“salt”) and -gen (“to produce”), because they all produce sodium salts of similar properties, of which sodium chloride—table salt, or halite—is best known.

Because of their great reactivity, the free halogen elements are not found in nature. In combined form, fluorine is the most abundant of the halogens in Earth’s crust. The percentages of the halogens in the igneous rocks of Earth’s crust are 0.06 fluorine, 0.031 chlorine, 0.00016 bromine, and 0.00003 iodine. At and Ts do not occur in nature, because they consist of only short-lived radioactive isotopes.

Chlorine is the best known of the halogen elements. The free element is widely used as a water-purification agent, and it is employed in a number of chemical processes. In the past ethylene dibromide was extensively used as an additive in.

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To destroy the unreacted Bromine :

Bromination of aniline is taken out in by reacting aniline with bromine and acetic acid. This reaction gives us in a tri-substituted product known as 2,4,6 tribromoaniline which is basically a white precipitate.

During Bromination reaction, Sodium Bisulfite may be added if there is any unreacted bromine left in the reaction combination. This is compulsory because lively Bromine can barge into the reaction because of bromine's oxidizing characterstics.

Sodium Bisulfite Solution is a reducing agent and it can change into unreacted bromine and bromate by force it into the bromide.

Moreover, Sodium bisulfite can also help in show the final color of the solution because of the bromine presence.

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The relationships among the variable quantities pressure 'P', volume 'V', number of moles 'n', and absolute temperature 'T' expressed by the ideal gas law equation.

The ideal gas law -

Ideal gas - It is a speculative or hypothetical gas with independent behavior of attractive forces and repulsive forces. It can be described by the ideal gas law completely. This is not possible in real life. But it might be possible under high pressure and high temperature.

The ideal gas law is an equation which expresses the relationship among variable quantities namely pressure, volume, number of moles and absolute temperature. It can also be called a general gas equation.

 The ideal gas equation is :

                 PV = nRT

where,

P = pressure,

V = volume,

n = number of moles / amount of substance

R = Ideal gas constant (It is a constant with definite value and not a      

     variable)

T = absolute temperature

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Red gold is a gold‑copper alloy used to make jewelry.

Red gold is an alloy created by combining pure gold and copper without any or very little silver.

Here the percentage by mass of gold

= (100/9.47) × 5.71832496

= 60.3835794 %

The percentage by mass of copper

= (100/9.47) × 3.75167504

= 39.6164207 %

The pieces of jewelry ( weight 9.47g) contains 60.3835794 % Gold and 39.6164207 % copper.

What is red gold?

Red gold is an alloy created by combining pure gold and copper without any or very little silver.

Since gold is yellow—at least pure gold is—there is no such thing as red gold, the phrase "red gold" is truly an oxymoron.

A homogenous blend of two or more metallic elements is referred to as an alloy. Alloys are valuable because they can be designed to have unique properties that are impossible to achieve with pure metals. Silver and copper are the two ad metals that are used most frequently in gold alloys. In the past, the majority of gold alloys were composed of copper, silver, and all three metals, along with other trace metals. These mixes typically yield a pleasing yellow hue that resembles pure gold.

Let's assume the pieces of jewelry (weight 9.47g) contains X g gold and  Y g copper.

Now according to the question,

X+Y = 9.47 .......... (1)

Again we know that, density= mass/volume

So,

      X/19.3 + Y/8.96 = 0.715   ............. (2)

Or,  X/19.3 = 0.715 - Y/8.96

Or,  X = 13.7995 - 19.3Y/8.96

If we put the value of X in the equation (1). Then

     13.7995 - 19.3Y/8.96 + Y = 9.47

Or, Y(19.3/8.96 - 1) = 4.3295

Or, Y = 4.3295 /1.15401786

Or, Y = 3.75167504

Now, from equation (1).

     X+ 3.75167504 = 9.47

Or, X = 5.71832496

Here the percentage by mass of gold

= (100/9.47) × 5.71832496

= 60.3835794 %

The percentage by mass of copper

= (100/9.47) × 3.75167504

= 39.6164207 %

The pieces of jewelry ( weight 9.47g) contains 60.3835794 % Gold and 39.6164207 % copper.

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Airat 100ºF and 2 atm is passed through a shallow bed ofnaphthalene spheres ½ in. in diameter at rate of 5 ft/s, based onthe empty cross sectionof the bed.

The simplest polycyclic aromatic hydrocarbon, naphthalene is an organic chemical with the formula It is a white crystalline solid with a distinctive odor that may be detected at concentrations as low as 0.08 ppm by mass. The structure of naphthalene is a fused pair of benzene rings, making it an aromatic hydrocarbon. The primary component of conventional mothballs is what makes it most well-known.

Two distinct accounts from the early 1820s mentioned a white solid produced by the distillation of coal tar that had a strong odor. In 1821, John Kidd cited these two disclosures and went on to discuss many of the qualities and methods of manufacturing of this drug. He suggested calling it naphthaline.

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When ethanol and pbr3 combine, bromoethane and phosphoric acid are created.

PBr3+3C2H5OH------>3C2H5Br+H3PO3

The chemical name for phosphorous tribromide is PBr3. It can be created by the interaction of red phosphorous with bromine and is a Lewis acid or electron deficient chemical that lacks a complete octet. This process is quite exothermic.

It is a colorless liquid mostly utilized for changing various alcohols into their corresponding alkyl bromides. The reaction is an inverted configuration bimolecular nucleophilic substitution reaction. Alkyl bromide is the main byproduct of this process.

Alcohol attacking phosphorous tribromide triggers this reaction's mechanism, which results in the substitution of an alcohol group for a bromine atom.

     H  H      

       |  |

 H -c-c-Br  +Mg------> C2H5MgBr

       |  |

      H H

CH3MgBr = (Grignard reagent compound )

We can add a single carbon atom to make a primary alcohol by reacting a Grignard reagent with formaldehyde.

                                                                             _

CH3CH2MgBr+ H2C=O -------> CH3CH2CH2O     ----->CH3CH2OH

AQUEOUS ACID: (taking HCL as not mentioned)

CH 3 CH 2 (OH) + HCl ------> CH 3 CH 2(Cl) + H 2 O

Reaction type: double replacement

resulting product: CH 3 CH 2 Cl

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