A student performed an experiment similar to that in Section B from the
"Use and Abuse of Aluminum and Its Compounds" lab. She started with a piece of aluminum foil with a mass of 0.0432 grams. She produced 0.5987 grams of alum crystals. What was her percent yield for the experiment?

Answer:

(a) The kinetic energy in joules is 194400 J

(b) The energy in calories is 46462.72 calories

(c) When the automobile brakes to a stop, the energy will decrease to 0 J.

Explanation:

(a) Kinetic energy (K.E) is given by the formula below

\(K.E = \frac{1}{2}mv^{2}\)

Where K.E is the kinetic energy in Joules (J)

\(m\) is the mass in kilogram (kg)

\(v\) is the velocity in meter per second (m/s)

From the question,

\(m =\) 1200 kg

\(v =\) 18 m/s

Hence,

\(K.E = \frac{1}{2}mv^{2}\) becomes

\(K.E = \frac{1}{2}(1200)(18)^{2}\\K.E = (600)(324)\\\)

\(K.E = 194400\) J

This is the energy is joules

(b) To convert this energy to calories (cal)

4.184 J = 1 cal

Then, 194400 J = \(x\) cal

\(x = \frac{194400 \times 1}{4.184}\)

\(x = 46462.72\) cal

K.E = 46462.72 calories

This is the energy in calories

(c) When the automobile brakes to a stop, the energy will decrease to 0 J.

The density of the iron pyrite cube is 1.343 g/cm³.

Given,

Side of iron pyrite cube = 0.31 cm

Mass of iron pyrite = 0.040 g

The volume of iron pyrite cube = s³ cm³

Or, volume = 0.029791 cm³

We have to find the density of the sample.

Density is defined as the mass per unit volume. Or, it is the ratio of mass to the volume of the substance.

Using the formula for density, we get,

Density = mass/volume

Or, density = 0.40/0.029791

Or, density = 1.343 g/cm³

Hence, the density of the iron pyrite cube is 1.343 g/cm³.

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The following are categorized into polar or nonpolar molecules:

a) Beryllium chloride (BeCl₂) is a nonpolar molecule. The Be-Cl bond is polar due to the electronegativity difference between beryllium and chlorine, but the molecule is linear with the two polar bonds pointing in opposite directions, resulting in a net dipole moment of zero.

b) Hydrogen sulphide (H₂S) is a polar molecule. The H-S bond is polar due to the electronegativity difference between hydrogen and sulfur, and the molecule has a bent shape, resulting in a net dipole moment that is not zero.

c) Sulphur trioxide (SO₃) is a nonpolar molecule. The S-O bonds are polar due to the electronegativity difference between sulfur and oxygen, but the molecule is trigonal planar with the three polar bonds pointing in different directions, resulting in a net dipole moment of zero.

d) Water (H₂O) is a polar molecule. The H-O bond is polar due to the electronegativity difference between hydrogen and oxygen, and the molecule has a bent shape, resulting in a net dipole moment that is not zero.

e) Trichloromethane (CHCl₃) is a polar molecule. The C-Cl bonds are polar due to the electronegativity difference between carbon and chlorine, and the molecule has a tetrahedral shape, resulting in a net dipole moment that is not zero.

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Answer:

%Sgr = 1% (1 sig.fig.)

Explanation:

mass water = 350ml x 0.975g/ml = 341.25g

mass sugar added = 4g

solution mass = 341.25g + 4g = 345.25g

%sugar = (4g/345.25g)·100% = 1.1586% ≅ 1% (1 sig.fig)

The percent composition by the mass of the sugar solution is:

e. 1.16 %

This can be calculated by using mass of sugar.

Mass of water = 350ml x 0.975g/ml = 341.25g

Mass of sugar added = 4g

Total solution's mass = 341.25g + 4g = 345.25g

%sugar = (4g/345.25g)·100%

%sugar= 1.1586% ≅ 1.16 %

Thus, the percent composition of sugar is 1.16%. Hence, option E is correct.

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Sedimentation, filtration, and coagulation are the treatments that will help remove contaminants from minerals or from the pipes carrying water from a source.

Sedimentation is a process in which suspended particles settle out of water. It is one of the most basic techniques for removing particles from water. As particles settle, they become trapped in the bottom of a container or settle to the ground in an outdoor setting

Filtration is a method of removing particles from a fluid. It is a physical or chemical separation method that separates solids from fluids (liquids or gases) by adding a medium through which only the fluid can pass.

Coagulation is the process of using chemicals to remove contaminants from water. By creating a chemical reaction, coagulation destabilizes particles and causes them to clump together. This helps to remove the contaminants from the water.

Disinfection is the process of eliminating or destroying pathogens that cause infection. Disinfection eliminates harmful microorganisms by destroying or inactivating them. The disinfectant is a chemical or physical agent that is used to destroy or inactivate harmful microorganisms.

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You need to know the reaction's standard enthalpy change, standard entropy change, and temperature in order to calculate the value of Kp at a specific temperature.

The equilibrium constants for a perfect gaseous mixture are Kp and Kc. When equilibrium concentrations are represented in terms of atmospheric pressure and Kc is the equilibrium constant, Kp is the equilibrium constant utilized.

The equilibrium constant, as defined by the "Law of Chemical Equilibrium," is the ratio of product of product concentration to product of reactant concentration. The stoichiometric coefficient in the balanced chemical equation increases with each concentration term.

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Answer:

241.08039999999588

Explanation:

the great size or extent of something

The thermodynamics of leaching of ilmenite in hydrochloric acid for titania pigment production is an industrial production of nano-sized titanium dioxide (TiO2).

Thermodynamics is defined as the change in the energy of system that brings about work in that system.

The leaching of ilmenite which is a titanium-iron oxide mineral with HCl can lead to the production of titanium dioxide (TiO2).

The use of thermodynamics in this process controls the heat and energy of the leaching system leading to a better yield of final products.

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Answer:

6186.98

Explanation:

105.4 mol of nickel is 6186.98 nickel

By using Avogadro's Law we have:

Where V is volume and n is moles, By substituting what have to find the unknown V2 gives:

11.0 L/ 7.70 moles = V2/ 2.97 moles

V2 = 11.0 L x 2.97 moles / 7.7 moles

V2 = 4.24 L. This is the volume of gas that would have escaped

New volume of the container is:

V= 11.0 L- 4.24 L

V= 6.76 L

Answer is 6.76 L

Explanation:

3 moles of O2 will be produced from 2moles of NaCLO3.

hope this helps you.

Answer:

Q =  57934.8 J

Explanation:

Given data:

Mass of water = 180.0 g

Initial temperature = 19°C

Fina temperature = 96°C

Specific heat capacity of water = 4.18 J/g.°C

Heat absorbed = ?

Solution:

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

ΔT = 96°C - 19°C

ΔT = 77°C

Q = 180.0 g×4.18 J/g.°C×77°C

Q =  57934.8 J

The electron configuration for

• Aluminium : ,1s^2, ,2s^2, 2p,^,6, ,3s^2, 3p^1

• Carbon : ,1s^2, ,2s^2, 2p,^,2

1. We can see that Carbon has 2 electrons in its p orbital , So option C is correct .

2. We can see that Aluminium has 6 electrons in its p orbital, So option D is correct.

• Choose option C and D .

Answer:

its the second one and the fourth one

Explanation:

am i correct?

Answer :

Explanation :

When 25.0g of Zn reacts, mols of HCl are consumed 0.7648 moles HCl

Write down the balanced chemical equation for this one replacement reaction first.

Zn(s)+2HCl(aq)→ZnCl2(aq)+H2(g)↑⏐

Now take note of the 2:1 mole ratio of reaction between the two reactants. This demonstrates that the reaction will always use up two times as much hydrochloric acid as zinc metal.

As you are aware, a solution's molarity indicates the number of moles of solute—in your case, hydrochloric acid, HCl—that are present in one liter of the solution.

The molarity of the hydrochloric acid solution is reported to be

3.05 mol L−1. This indicates that for every 1 L of solution, 3.05 moles of hydrochloric acid are produced. Remember this for later. You are aware that the reaction needs 25.0 g of zinc.

By using the molar mass of zinc, you can convert this mass to moles.

25 g per mole Zn

65.38g = 3.824 moles of zinc

n order for this many moles of zinc to react, you'd need

0.3824moles Zn⋅2amoles

HCl 1 mole Zn=0.7648 moles HCl

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It's never a good idea to use your credit card when experiencing strong emotions, especially if you tend to steer toward 'retail therapy.

As combustion always result into the formation of water, the other type of reactions that may result into formation of water are Acid-Base Neutralization Reactions and Hydrogen and Oxygen Reaction.

Acid-Base Neutralization Reactions:

A neutralisation reaction is a chemical process in which an acid and a base combine to produce salt and water as the end products.

H⁺ ions and OH⁻ ions combine to generate water during a neutralisation reaction. Acid-base neutralisation is the most common type of neutralisation reaction.

Example: Formation of Sodium Chloride (Common Salt):

HCl + NaOH → NaCl + H₂O

Hydrogen and Oxygen Reaction:

Water vapour is created when hydrogen gas (H₂) and oxygen gas (O₂) are combined directly. This reaction produces a lot of heat and releases a lot of energy.

Example: 2 H₂ + O₂ → 2 H₂O

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Answer: Its A nucleic acids

Explanation:

Nucleic acids, and DNA in particular, are key macromolecules for the continuity of life. DNA bears the hereditary information that's passed on from parents to children, providing instructions for how (and when) to make the many proteins needed to build and maintain functioning cells, tissues, and organisms.

Nucleic acids carry genetic information from parents to their children.

Nucleic acids are biopolymers, macromolecules, essential to all known forms of life.[1] They are composed of nucleotides, which are the monomers made of three components: a 5-carbon sugar, a phosphate group and a nitrogenous base. The two main classes of nucleic acids are deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). If the sugar is ribose, the polymer is RNA; if the sugar is the ribose derivative deoxyribose, the polymer is DNA.

Nucleic acids are naturally occurring chemical compounds that serve as the primary information-carrying molecules in cells and make up the genetic material. Nucleic acids are found in abundance in all living things, where they create, encode, and then store information of every living cell of every life-form on Earth. In turn, they function to transmit and express that information inside and outside the cell nucleus to the interior operations of the cell and ultimately to the next generation of each living organism. The encoded information is contained and conveyed via the nucleic acid sequence, which provides the 'ladder-step' ordering of nucleotides within the molecules of RNA and DNA. They play an especially important role in directing protein synthesis.

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The solubility of the salts is affected by the temperature changes. 1. NaCl is least affected by temperature. 2. supersaturated. 3. 60 grams KBr. 4. Ethanol has both polar and non-polar groups. 5. Mixing and shaking.

A KBr solution with 90 gm solute in 100 grams of water at 50 degrees is classified as supersaturated. 60 grams of KBr are needed to make a saturated solution in 100 gm of water at 30 degrees.

Ethanol is a general solvent due to the presence of both the polar and the non-Polar groups. As a result, it is easier to dissolve both polar molecules and non-Polar molecules. The dissolving rate can be increased by mixing or shaking the solution. Also, the sugar dissolves faster in hot than cold tea.

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Answer:

The answer is "Al= 9.8% and Fe=18.0%"

Explanation:

Given:

The weight of \(FeCl_3\ and \ ALCl_3\) = 5.95g

\(gFeCl_3=gFe (\frac{Mw\ FeCL_3}{\text{atomic weight of Fe}})\\\\gAlCl_3=gAl (\frac{Mw\ AlCL_3}{\text{atomic weight of Al}})\\\\\)

\(\to a = FeCl_3+AlCl_3\\\\\to a=x+y \\\\ \to a= 5.95\)

\(\to a =x \ gFe (\frac{Mw\ FeCL_3}{\text{atomic weight of Fe}})+ y \ gAl (\frac{Mw\ AlCL_3}{\text{atomic weight of Al}})\\\\\)

\(\to x (\frac{162.2}{55.85})+ y (\frac{133.34}{26.98})= 5.95\\\\\to 2.90x+4.94y=5.95\\\\\ similarly \ for \ oxidies:\\\\\to 143x+1.89y=2.62\\\\\to x= 1.07 \ \ \ and \ \ y= 0.58\\\\\to \ Al \% = \frac{0.58}{5.95} \times 100= \bold{9.8} \%\\\\\to \ Fe \% = \frac{1.07}{5.95} \times 100= \bold{18.0} \%\)

The mass of the compound has been given as the mass of each element in the compound. The percent Fe in the mixture is 18%, and the percent Al in the mixture is 9.8%.

The percent composition has been given as the mass of the element in the compound. The percent of iron and aluminum in their chlorides can be given as:

\(\rm Fe=Fe\;\times\;\dfrac{Mwt\;FeCl_3}{Mwt\;Fe}\)

\(\rm Al=Al\;\times\;\dfrac{Mwt\;AlCl_3}{Mwt\;Al}\)

The total mass of the compounds has been 5.95 grams.

Thus,

\(5.95=\rm FeCl_3+AlCl_3\)

The mass of Fe and Al will be x and y of the mass in the compounds. Thus,

\(5.95=\rm x\;Fe\;\times\;\dfrac{Mwt\;FeCl_3}{Mwt\;Fe}\;+\;y\;Al\;\times\; \dfrac{Mwt\;AlCl_3}{Mwt\;Al}\)

The oxides of the chemical has the sum of mass of 2.62 grams.

The mass of oxides can be given as:

\(2.62=\rm x\;Fe\;\times\;\dfrac{Mwt\;Fe2O_3}{Mwt\;Fe}\;+\;y\;Al\;\times\; \dfrac{Mwt\;Al_2O_3}{Mwt\;Al}\)

Substituting the values of mass of Al, aluminum chloride, oxide, and Fe and its compounds.

\(\rm 2.90x+4.94y=5.95\\143x+1.89y=2.62\)

Solving the equation, x = 1.07, and y = 0.58

The percent mass of the compounds has been given as the ratio of mass with compound mass.

Thus, the percent mass of Fe has been:

\(\rm Fe=\dfrac{1.07}{5.95}\;\times\;100\\ Fe=18\;\%\)

The percent mass of Al has been:

\(\rm Al=\dfrac{0.58}{5.95}\;\times\;100\\ Al=9.8\;\%\)

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When the equilibrium constant is higher than one, it indicates that the reaction prefers to produce products, whereas if the equilibrium constant is less than one, it indicates that the reaction prefers to produce reactants. If the equilibrium constant is equal to one, the reaction proceeds in both directions equally.

In a chemical reaction, exothermic reactions are defined as reactions that release heat into their environment. It implies that heat is given off when reactants are converted to products. At equilibrium, an exothermic reaction continues to be exothermic, meaning that heat is given off even after the reaction reaches a state of equilibrium.There are two types of reactions: exothermic and endothermic.

A reaction is classified as exothermic if it releases heat, and endothermic if it absorbs heat. The direction of the reaction is determined by whether it is exothermic or endothermic. At equilibrium, the reaction is no longer moving forwards or backwards. It's also worth noting that reactions can be exothermic in one direction and endothermic in the other.

The equilibrium constant (K) is defined as the ratio of the concentration of products to the concentration of reactants in the chemical reaction equation. It is used to express how much of the products is generated by the reaction in comparison to the reactants.  the equilibrium constant aids in the identification of the direction in which the reaction will proceed at equilibrium.

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Answer:

Can you arrange it? I don't understand

The correct answer to the question about the phenol used in some mouthwashes and throat lozenges is option C, hexylresorcinol.

This compound is a type of phenol that is used as an antiseptic and disinfectant in various products, including mouthwashes and throat lozenges.

It is effective in killing bacteria and other microorganisms that can cause infections and other health problems.

Therefore, the correct answer to this question is hexylresorcinol.

Hexylresorcinol is a substituted phenol with bactericidal, antihelminthic and potential antineoplastic activities.

Hexylresorcinol is used as an antiseptic in mouthwashes and skin wound cleansers.

The antibacterial effects of hexylresorcinol in vivo may be mediated through several mechanisms including reducing bacterial adherence to the pharynx, inhibiting bacterial biofilm formation, disrupting bacterial cell chain formation, and modifying cell surface hydrophobicity

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Answer:

stay the same

Explanation:

Answer:

cheese and bread

Explanation:

2 bread 1 cheese = cheese sandwich