The picture below is of oxygens bonded together. This forms a...

a) molecule
b) element
c) molecular compound
d) atom​

Answer:

600 grams

Explanation:

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

12x50=600

Answer:

Increasing the temperature increases reaction rates because of the disproportionately large increase in the number of high energy collisions.

Explanation:

Hope this helps :)

Answer: Finding the [H3O+] and pH of Strong and Weak Acid Solutions The larger the Ka, the stronger the acid and the higher the H+ concentration at equilibrium. hydronium ion, H3O+, 1.0, 0.00, H2O, 1.0×10−14, 14.00.

Explanation:The hydrogen ion in aqueous solution is no more than a proton, a bare ... the interaction between H+ and H2O .

The data for the experiment of Constant Pressure Calorimetry can be collected either in-person in the lab or completely online with virtual data.

Constant Pressure Calorimetry is a technique used to measure heat exchange in a chemical or physical process that occurs at constant pressure. In an in-person lab setting, data can be collected by conducting the experiment in a controlled environment, using appropriate calorimetric equipment, and measuring the temperature changes before and after the process.

The heat exchanged can be calculated by measuring the temperature change and using the specific heat capacity of the materials involved. Alternatively, in a completely online setting, virtual data can be used to simulate the experiment using computer simulations or virtual labs.

The data can be collected virtually by inputting values into the virtual lab software and analyzing the results obtained. Both in-person and online methods can provide valuable data for analyzing and interpreting the heat exchange in the experiment of Constant Pressure Calorimetry.

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Answer:

false the answer is woody

Explanation:

those are the two types of stems

1) 5.1167 x 10²⁴atoms of chlorine. 2) 248.00 g. 3) 4.8825 x 10⁷ moles of helium. 4) 2.7757 x 10²⁴ atoms of sulfur.  5) Molar mass of Co (cobalt) is 58.93 g/mol.  6) Formula mass =  310.18 g/mol.

Sum of the atomic masses of all the atoms in chemical formula is called formula mass

1.)  Number of atoms = 8.500 moles x 6.022 x 10²³ atoms/mole = 5.1167 x 10²⁴ atoms of chlorine.

2.) Molar mass of oxygen is 16.00 g/mol. Therefore:

Mass of 15.50 moles of oxygen = 15.50 moles x 16.00 g/mol = 248.00 g.

3.) Molar mass of helium is 4.00 g/mol. Therefore, the number of moles of helium in 1.953 x 10⁸ g is:

Number of moles = 1.953 x 10⁸ g / 4.00 g/mol = 4.8825 x 10⁷ moles of helium.

4.) Molar mass of sulfur is 32.06 g/mol. Therefore, the number of moles of sulfur in 147.82 g is:

Number of moles = 147.82 g / 32.06 g/mol = 4.6084 moles of sulfur.

To find the number of atoms, we can use Avogadro's number again:

Number of atoms = 4.6084 moles x 6.022 x 10²³ atoms/mole = 2.7757 x 10²⁴ atoms of sulfur.

5.) Molar mass of Co (cobalt) is 58.93 g/mol.

6.) Ca₃(PO₄)₂ contains 3 calcium atoms, 2 phosphorus atoms, and 8 oxygen atoms.

Atomic masses of these elements are:

Calcium (Ca) = 40.08 g/mol

Phosphorus (P) = 30.97 g/mol

Oxygen (O) = 16.00 g/mol

Therefore, formula mass of Ca₃(PO₄)₂ is:

Formula mass = (3 x 40.08 g/mol) + (2 x 30.97 g/mol) + (8 x 16.00 g/mol)

= 120.24 g/mol + 61.94 g/mol + 128.00 g/mol

= 310.18 g/mol.

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Answer:

A. 7

(assuming the water is neutral)

Answer:

Option (2)

Explanation:

Since the amount of each sample is the same, we are looking for the metal with the greatest density, which is copper.

Answer:

a. 2HCl + 1Mg(OH)2 → 1MgCl2 + 2H2O

b. 1 mol MgCl2/ 1 mol Mg(OH)2

1 mol MgCl2/ 2 mol HCI

Explanation:

a. The reaction of an acid (HCl) with a base (Mg(OH)2) produce water (H2O) and the salt (MgCl2):

_HCl + _Mg(OH)2 → _MgCl2 + _H2O

To balance the Cl:

2HCl + _Mg(OH)2 → _MgCl2 + _H2O

To balance the oxygen:

2HCl + _Mg(OH)2 → _MgCl2 + 2H2O

The reaction is now balanced

2HCl + 1Mg(OH)2 → 1MgCl2 + 2H2O

b. Based on the balanced reaction, the moles ratios are:

1 mol MgCl2/ 1 mol Mg(OH)2

1 mol MgCl2/ 2 mol HCI

A chair is placed several feet from the fire in a fireplace. The fireplace has the glass screen. The side of the chair facing the fireplace gets warm because of the radiation. The correct option is c.

The Radiation is the energy that comes from the source and the travels through space at  speed of the light. This energy has the electric field and the magnetic field associated with the one, and has the wave-like properties. It is also called as the electromagnetic waves.

The  heat is a form of the energy that is transferred among the different substances. The three mode of the heat transfer : convection, conduction and the radiation. Radiation will be differentiated into the two separate categories: the ionizing and the non-ionizing radiation.

Therefore, because of the radiation , the side of the chair facing the fireplace gets warm . The option c is correct.

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Answer:

the catalyst is the two gray dots

Answer: hola

Explanation:Añada cinco gotas al 2 por ciento de tintura de yodo de farmacopea EE. UU. (U.S.P., por sus siglas en inglés) por cada litro de agua limpia. Para el agua turbia añada diez gotas y deje la solución reposar durante 30 minutos por lo menos.

Answer:

160 I think or 200

Explanation:

the lines are pulling on the same side so you add those

Overlapping, in the context of analytical chemistry, refers to the situation where the absorption bands of two or more compounds in a sample overlap in a way that makes it difficult to accurately measure or estimate their individual concentrations. The specific approach used to correct for overlapping depends on the nature of the compounds, the instrumentation available, and the analytical requirements of the study.

Overlapping can lead to distorted readings and affect the accuracy of analysis. To correct for overlapping, various methods can be employed, such as selective wavelength measurements, derivative spectroscopy, multivariate analysis, and pre-treatment techniques.

Selecting an appropriate wavelength or using derivative spectroscopy enhances resolution and allows for better differentiation of compounds. Multivariate analysis utilizes mathematical algorithms to predict individual concentrations.

Pre-treatment methods, like sample dilution or separation, can reduce overlapping effects. The choice of correction method depends on the compounds, available instrumentation, and specific analytical requirements.

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Answer:

30.031 g/mol

Explanation:

..................

The molar mass of CH₂O is 30.

Molar mass can be defined as 'mass per mole.' In other words, molar mass is the sum of the mass of all the atoms found in one mole's worth of a substance. It is expressed in units of grams per mole.

The definition applies to pure substance.

The molar mass allows for converting between the mass of a substance and its amount for bulk quantities.

It is calculated as the sum of standard atomic weights of all atoms that form one entity of the substance.

Given,

The molecular formula = CH₂O

Atomic mass of C = 12

Atomic mass of H = 1

Atomic mass of O = 16

Molar mass = Sum of atomic masses of all the atoms

                       = 12 + (2 × 1) + 16

                       = 12 + 2 + 16

                       = 30

Therefore, The molar mass of CH₂O is 30.

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Answer:

5 grams of iron react with 5 grams of oxygen to produce iron 3 oxide.

The actual yield of the reaction is--- 5 grams.

What is the percent yield?

Explanation:

The balanced chemical equation of the reaction is:

\(4Fe(s)+3O_{2} (g)->2Fe_{2} O_3(s)\)

1)Identify the limiting reagent.

2)Using the limiting reagent calculate the amount of theoretical yield formed.

Identification of limiting reagent:

4 mol of Fe reacts with 3mol. of O2

that is:

4mol(55.84g/mol) of Fe reacts with ---- 3mol (32.0g/mol)

=223.36g of Fe reacts with ---- 96g. of O2

then,

5g of Fe requires how many grams of O2?

\(=>5g. of Fe * \frac{96g O2}{223.36g Fe} \\=2.14g. of O_{2} .\\\)

But provided 5g of O2.

So, O2 is present more than required.

Hence, O2 is the excess reagent and the limiting reagent is Fe.

The amount of product formed depends only on the amount of Fe only.

Theoretical yield:

From the balanced chemical equation:

4mol. of Fe forms ----- 2mol. of Fe2O3.

that is

223.36g of Fe forms --- 2(159.68g)of Fe2O3.

=>223.36g of Fe forms --- 319.36g of Fe2O3.

then,

5g of Fe forms ----? grams of Fe2O3

\(=>5g of Fe * \frac{319.36g Fe2O3}{223.36g of Fe} \\=7.14g. of Fe2O3\\\)

\(%Error =\frac{actual yield}{theoretical yield} * 100\\\\ %error=\frac{5g}{7.14g} * 100\\ %error =70.0\)% error=actual yield/ theoretical yield  x 100

%error=5g./7.14g  x100

=>%error=70.0

Hence, the answer is 70.0%.

sp2 is the hybridization of the xenon atom in this molecule.

When two atomic orbitals join to generate a hybrid orbital in a molecule, the energy of the individual atoms' orbitals is redistributed to give orbitals of equivalent energy. We refer to this process as hybridization. The atomic orbitals with equivalent energies are mixed together during the hybridization process, which primarily involves the fusion of two s orbitals, two p orbitals, or the mixing of a s orbital with a p orbital or a d orbital. Hybrid orbitals are the new orbitals that are created in this way. More importantly, hybrid orbitals are very helpful in describing the characteristics of atomic bonds and molecular geometry.

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Sulfurous acid is a weak acid with the molecular formula H2SO3. It has two acidic hydrogen atoms, which can be sequentially neutralized. The successive neutralizations of each acidic hydrogen of sulfurous acid are as follows:

First acidic hydrogen: H2SO3 + NaOH → NaHSO3 + H2O

The molecular equation is H2SO3 + 2NaOH → Na2SO3 + 2H2O

The net ionic equation is H2SO3 + 2OH- → SO32- + 2H2O

Second acidic hydrogen: NaHSO3 + NaOH → Na2SO3 + H2O

The molecular equation is HHSO3 + NaOH → Na2SO3 + H2O

The net ionic equation is HSO3- + OH- → SO32- + H2O

Overall reaction: H2SO3 + 2NaOH → Na2SO3 + 2H2O

The molecular equation for the overall reaction is H2SO3 + 2NaOH → Na2SO3 + 2H2O

The net ionic equation for the overall reaction is H2SO3 + 2OH- → SO32- + 2H2O

In summary, the molecular and net ionic equations for the successive neutralizations of each acidic hydrogen of sulfurous acid are given above.

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10 g of an unknown compound is added to water to form a 7.89 molar solution. if two liters of solution are present,  the molar mass of the unknown compound is 0.64 g/ mol.

Given that :  

The mass of the compound = 10 g

The molarity of the compound = 7.8 M

The volume = 2 L

The number of the moles = molarity × volume in L

                                           = 7.89 × 2

                                           = 15.78 mol

The molar mass = mass / moles

                            = 10 / 15.78

                             = 0.64 g/mol

Thus, the molar mass of the given unknown compound is 0.64 g/mol.

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The freezing point depression of a solution is proportional to the molality (m) of the solution, where molality is defined as the number of moles of solute per kilogram of solvent.

The more solute dissolved in a solution, the lower its freezing point will be. Based on this information, we can match the aqueous solutions with their appropriate letter from the column on the right:

0.10 m CuCl2 → C. Third lowest freezing point

0.13 m Cr(CH3COO)2 → B. Second lowest freezing point

0.17 m CuSO4 → A. Lowest freezing point

0.37 m Glucose (nonelectrolyte) → D. Highest freezing point

Explanation:

CuCl2 and CuSO4 are both strong electrolytes that dissociate completely in solution to form two ions per formula unit.

Therefore, they will have a greater effect on the freezing point depression compared to Cr(CH3COO)2, which only dissociates partially in solution.

Glucose is a nonelectrolyte and does not dissociate in solution, so it will have no effect on the freezing point depression. Therefore, it will have the highest freezing point among the given solutions.

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Answer:

The correct option is D, KI.

Explanation:

Answer:manufacture

Explanation:

The pollution can be controlled with the help of reducing the need for the manufactured good and transportation.

A pollution can be given as the presence of the harmful substances in the environment. The harmful substances known as pollutants deteriorate the quality of the environment and effect the health of living organism as well.

The pollution in air has been contributed with the increased need of the manufactured goods and transportation, and thereby the reduction will be found to reduce the pollution too.

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The silver ring of the same mass of 27.5 gm of gold will have 1.9 times more atom.

We need to find moles first,

Moles = mass/ Atomic Mass

Then number of atoms can be calculated from moles,

So , no. of moles of gold ring = 27.5g/196.967

= 0.13 moles.

Since 1 mole contains 6.023 x 10^23 atoms, then 0.13 mole contains (6.023 c 10^23) x 0.13 atoms

= 7.82 c 10^22 atoms.

no. of moles for silver = 27.5/107.87

= 0.25 moles.

This contains (6.023 x 10^23) x 0.27 atoms.

= 1.5 x 10^23 atoms.

So 27.5g of silver contains 1.67 x 10^23/9.17 x 10^22 more atoms than 27.5g of gold.

So 27.5g silver contains 1.9 x more atoms than 27.5g of gold.

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For filtering particles from a 180°F gas stream containing ammonia, a suitable fabric would be PTFE (Polytetrafluoroethylene). For the 250°F gas stream containing SO₂, a suitable fabric would be P84 (Polyimide).

When dealing with a 180°F gas stream containing ammonia, PTFE fabric is a good choice due to its excellent chemical resistance and high-temperature stability. PTFE is known for its nonstick properties and resistance to a wide range of chemicals, including ammonia. It can withstand high temperatures and is capable of filtering out particles effectively.

In the case of a 250°F gas stream containing SO₂, P84 fabric is a suitable option. P84, a polyimide-based fabric, exhibits excellent resistance to acids, alkalis, and organic solvents, making it suitable for environments containing SO₂. It has good thermal stability, allowing it to withstand the high temperatures of the gas stream. P84 fabric also has a high filtration efficiency and can effectively capture fine particles.

Both PTFE and P84 fabrics are commonly used in industrial filtration applications due to their chemical resistance, high-temperature stability, and efficient particle filtration capabilities. However, it's important to consider specific operating conditions, such as gas composition, temperature, and other factors, to ensure the chosen fabric is compatible and optimized for the intended application.

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The monomer with the highest proportion of nonpolar groups, polymer such as an aromatic or aliphatic hydrocarbon.

With regards to creating a polymer that is less dissolvable in hexane, taking into account the properties of both the dissolvable and the monomer is significant. Hexane is a nonpolar dissolvable, meaning it has feeble intermolecular powers, while a monomer's dissolvability in hexane relies upon its extremity.

Extremity is a proportion of a particle's general charge circulation, and not set in stone by the presence of polar useful gatherings, for example, carbonyl or hydroxyl gatherings, which have halfway charges. Conversely, nonpolar gatherings, like hydrocarbons, have an even appropriation of electrons and no halfway charges.

Polymers produced using monomers containing polar practical gatherings will generally be more dissolvable in polar solvents, like water or ethanol, however less solvent in nonpolar solvents like hexane.

Then again, monomers containing nonpolar gatherings will quite often create nonpolar polymers, which have more vulnerable intermolecular powers and are less inclined to associate with polar solvents.

Subsequently, the most un-solvent polymer in hexane would be the one created from a monomer containing the most noteworthy extent of nonpolar gatherings, similar to a sweet-smelling or aliphatic hydrocarbon.

For instance, think about two monomers: vinyl chloride and styrene. Vinyl chloride is a polar monomer with a polar C-Cl bond, while styrene has a nonpolar fragrant ring.

At the point when these monomers are polymerized to shape polyvinyl chloride and polystyrene, separately, the polymer produced using styrene would be less dissolvable in hexane than the polymer produced using vinyl chloride.

This is on the grounds that the nonpolar styrene monomer creates a nonpolar polymer with more vulnerable intermolecular powers that are less inclined to cooperate with the nonpolar hexane dissolvable.

It's important that the length of the polymer chain likewise influences solvency in hexane. Longer polymer chains for the most part have more grounded intermolecular powers and are bound to communicate with the dissolvable, making them more solvent.

Accordingly, accepting comparable polymer chain lengths, the monomer with the most elevated extent of nonpolar gatherings is the critical calculate creating the most un-dissolvable polymer in hexane.

In rundown, to create a polymer that is least solvent in hexane, utilizing a monomer with a high extent of nonpolar gatherings, similar to a sweet-smelling or aliphatic hydrocarbon is fundamental.

This is on the grounds that nonpolar gatherings create nonpolar polymers that have more vulnerable intermolecular powers, which are less inclined to communicate with the nonpolar hexane dissolvable.

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Therefore, the volume of the irregularly-shaped piece of aluminum is 32.7 cm³

To find the volume of the irregularly-shaped piece of aluminum, we can use the formula:

Density = Mass / Volume
Rearranging the formula to solve for volume, we get:

Volume = Mass / Density

Plugging in the given values:

Volume = 88.3 g / 2.70 g/cm³

Simplifying the equation:

Volume = 32.7 cm³

Therefore, the volume of the irregularly-shaped piece of aluminum is 32.7 cm³.

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Answer:

2Na + 2H2O → 2NaOH + H2

Explanation:

This is the balanced equation of,

Sodium + water → sodium hydroxide + hydrogen

In order to maintain the accuracy of results , the tool which  is most useful for measuring 12 milliliters of saltwater is graduated pipette.

Accuracy in terms of chemistry can be defined as to how close a measurement is to the true value.There are three types of accuracy:

1) Point accuracy-It means accuracy is present at that point of scale only.It does not give any information about the accuracy of the instrument.

2)Percentage of true value--It is the accuracy  which is determined by identifying accuracy of the instrument  and comparing it with the measured true value.

3)Percentage of scale range- It is the accuracy  which determines accuracy of the measurement.

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The intermolecular forces present between the molecules of carbon tetrabromide (CBr4) are london dispersion forces.

What are lewis structures?

Dots are used to indicate the positions of electrons surrounding the atoms in a molecule's Lewis structure, and lines or pairs of dots stand in for covalent bonds between atoms. The goal of creating a Lewis dot structure is to locate lone electron pairs in molecules in order to better understand how chemical bonds are formed.

One carbon atom and four bromine atoms make up the chemical compound CBr4, often known as carbon tetrabromide. The carbon atom in the Lewis structure of CBr4 is surrounded by four single bonds, has four bromine atoms connected to it, and has three lone pairs on each of the bromine atoms.

The intermolecular forces present between the molecules of carbon tetrabromide are london dispersion forces.

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