watch the video included in between steps 2 and 3 under preparing the cu2 calibration curve. using what you learned about nh3 in general chemistry i and the solubility rules, identify the precipitate that form when nh3 is initially added to the copper sulfate solutions. canvas doesn't allow you to use subscripts in the answers to fill in the blank questions, so use the format h2o vs h2o or fe(no3)3 vs fe(no3)3 if a subscript is needed.

Answer

29.3171 g KClO₃

Procedure

To solve this question consider the following chemical reaction:

2KClO₃→2KCl+3O₂

Then we will use the ideal gas formula to determine the number of moles present in 6.75 L of oxygen gas.

Data:

V=6.75 L

T= 298 °K

P= 1.3 atm

R= 0.08206 L⋅atm⋅°K⁻¹⋅mol⁻¹

Equation

PV=nRT

Solve for n to get the moles

Use the stoichiometry of the reaction to convert from moles of oxygen to moles of KClO₃.

Finally, convert from moles to grams

Answer:

No, it will not exist in real life

Explanation:

Let us consider the electronic configuration of magnesium; Ne 3s2

We must also assume that the compound Mg20 is ionic. If this is the case, then it involve Mg+ and O^2-.

The electronic configuration of Mg+ is Ne 3s1. We can see that this specie has not yet attained a stable noble gas configuration, As a result of this, the ion is not stable. Hence, Mg20 does not occur in real life,

Answer:

Assuming the noise remains constant, the total noise for the longer path length, 65 scans should be 0.0005 x 65 = 0.0325 absorbance units. The new reading should be 0.01 absorbance units. The signal to noise ratio (SNR) of the new measurement will be 0.01/0.0325 = 3.08.

Signal averaging decreases the magnitude of the residual noise and increases the SNR. The total noise decreases by the square root of the number of scans, in this case √65 = 8, so for 65 scans, the noise level is 8 times lower than for a single scan.

Answer:

Cu₂S

Explanation:

From the question,

                     Cu                                 S

Mass:            40.80 g                      51.09-40.80 = 10.29 g

Mole ratio:     40.80/63.5                 10.29/32.1

                         0.64          :                0.32

Divide by the smallest,

                         0.64/0.32   :                0.32/0.32

                           2                :                  1

   Therefore,

Empirical formula = Cu₂S.

The amount of heat energy produced when 1 g of hydrogen and 2 g of nitrogen are reacted, is -6.61 KJ

First, we shall obtain the limiting reactant. Details below:

3H₂ + N₂ -> 2NH₃

From the balanced equation above,

28 g of N₂ reacted with 6 g of H₂

Therefore,

2 g of N₂ will react with = (2 × 6) / 28 = 0.43 g of H₂

We can see that only 0.43 g of H₂ is needed in the reaction.

Thus, the limiting reactant is N₂

Finally, we the amount of heat energy produced. Details below:

3H₂ + N₂ -> 2NH₃ ΔH = -92.6 KJ

From the balanced equation above,

When 28 grams of N₂ reacted, -92.6 KJ of heat energy were produced.

Therefore,

When 2 grams of N₂ will react to produce = (2 × -92.6) / 28 = -6.61 KJ

Thus the heat energy produced from the reaction is -6.61 KJ

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Answer:

1. 126.44 or 126.4

2. 12.766 or 12.8

3.190.77 or 190.8

4.12.833 or 12.8

Explanation:

Answer:

false

Explanation:

It is because the pH for Hydroxide ions is 7

Answer:

True

Explanation:

Acids have a low concentration of hydroxide ions and a pH of 1-6, while bases have a high concentration of hydroxide ions and a pH of 8-14

Answer:

B

Explanation:

Do diện tích tiếp xúc ở dạng bột cao hơn dạng tinh thể

The general gas equation, commonly referred to as the ideal gas law, represents the state of a fictitious ideal gas through an equation. Here the mass of helium gas required to pressurize 86 L tank to 201 atm is 2561.8 g.

According to the ideal gas law, the sum of the absolute temperature of the gas and the universal gas constant is equal to the product of the pressure and volume of one gram of an ideal gas.

The ideal gas equation is given as:

PV = nRT

n = PV / RT

56°C = 329 K

n = 201 × 86 / 0.08206 × 329 = 640.45 mol

Molar mass of 'He' = 4.00 g / mol

Mass =  640.45 × 4.00 = 2561.8 g

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Answer:

The rate at which ZnCl2 appears increases.

Explanation:

Hello,

In this case, the reaction is:

\(Zn(s) + 2HCl (aq) \rightarrow ZnCl_2 (aq) + H_2 (g)\)

Therefore, the law of rate proportions is:

\(\frac{1}{-1}r_{Zn}= \frac{1}{-2}r_{HCl}= \frac{1}{1}r_{ZnCl_2}= \frac{1}{1}r_{H_2}}\)

In such a way, since the concentration of hydrochloric acid is increasing The rate at which ZnCl2 appears increases, because the addition of a reactant is directly related with the products formation due to the fact that more reactant will yield more product.

Best regards.

To calculate the number of moles of AgNO₃ used in an experiment, we need to know the mass of AgNO₃ weighed out and the molar mass of AgNO₃.

By adding the atomic masses of the component elements, it is possible to get the molar mass of AgNO₃: AgNO₃ = Ag + N + 3O.

AgNO₃'s molar mass = as (1 × Ag atomic mass) + (1 × N atomic mass) + (3 × atomic mass of O)

AgNO₃'s molar mass = 1 × 107.87 g/mol + 1 × 14.01 g/mol + 3 × 16.00 g/mol.

∴ AgNO₃'s molar mass = 169.87 g/mol.

By dividing the mass of weighed-out AgNO₃ by its molar mass, we can now determine how many moles of AgNO₃ were utilized in the experiment:

AgNO₃'s mass and molar mass are used to calculate its moles.

For example: if 2.5 grams of AgNO₃ were weighed out at the beginning of the experiment, the calculation would be:

moles of AgNO₃ = 2.5 g ÷ 169.87 g/mol

moles of AgNO₃ = 0.0147 mol

∴, 0.0147 moles of AgNO₃ were used in the experiment.

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Stilbene dibromide includes (1R,2S)-1,2-dibromo-1,2-diphenylethane, (1R,2R)-1,2-dibromo-1,2-diphenylethane, (1S,2S)- It has three stereoisomers. 1,2-dibromo-1,2-diphenylethane.

Bromination of trans-stilbene primarily yields meso-1,2-dibromo-1,2-diphenylethane. Electrophilic bromine addition reaction. Stilbenes can exist as both trans and cis stereoisomers, but they naturally occur predominantly as the trans isomer due to their greater thermodynamic stability compared to the cis isomer.

If a molecule has two stereocenters there should be four possible stereoisomers. If a molecule has 3 stereocenters, there should be up to 8 stereoisomers. Therefore, the maximum number of stereoisomers for a given configuration is 2n. where n is the number of chiral centers.

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The chemical formula for copper(II) sulfate is CuSO4.

Copper(II) sulfate is a chemical compound that is made up of copper, sulfur, and oxygen. It has the chemical formula CuSO4 and is commonly referred to as "blue vitriol" or "bluestone." Copper(II) sulfate can be prepared by reacting copper oxide or copper metal with sulfuric acid. It is a blue-colored crystalline solid that dissolves easily in water.

Copper(II) sulfate has many uses in industry and can be used as a fungicide, herbicide, pesticide, and in the manufacture of other chemicals. It is also commonly used in schools and laboratories as a reagent in chemical reactions and experiments.

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Answer:The green growing on the penny of copper and the rust forming on the nail of iron are chemical changes. Boiling away salt water, scraping iron filings from a mixture of sand with a magnet, and breaking a rock with a hammer, are physical changes.

Explanation:

Given that, an experiment to measure the enthalpy change for the reaction of aqueous copper(II) sulfate, CuSO4(aq) and zinc, Zn(s) was carried out in a coffee cup calorimeter; the heat of the reaction in the whole system is calculated to be 2218.34 kJ

Heat of reaction (i.e enthalpy of reaction) is the quantity of heat that is required to be added or removed when a chemical reaction is taken place in order to maintain all of the compounds present at the same temperature.

The formula used to calculate the heat of the reaction can be expressed as follows:

Q = mcΔT

where:

From the information given:

∴

The change in temperature i.e. ΔT = T₂ - T₁

ΔT = 91.5° C - 25° C

ΔT = 66.5° C

The number of moles of CuSO₄ = 1.00 mol/dm³ × 50.0 cm³

\(\mathbf{= (1 \times \dfrac{50}{1000})\ moles}\)

= 0.05 moles

Then;

Using the relation:

\(\mathbf{number \ of \ moles = \dfrac{mass}{molar \ mass}}}\)

By crossing multiplying;

mass of CuSO₄ = number of moles of CuSO₄ ×  molar mass of CuSO₄

mass of CuSO₄ = 0.05 moles  × 159.609 g/moles

mass of CuSO₄ = 7.9805 grams

∴

Using the formula from above:

Q = mcΔT

Q = 7.9805 g × 4.18 kJ/g °C × 66.5° C

Q = 2218.34 kJ

Therefore, we can conclude that the heat of the reaction is 2218.34 kJ

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Answer:

A satellite campus or branch campus or regional campus is a campus of a university or college that is physically at a distance from the original university or college area. This branch campus may be located in a different city, state, or country, and is often smaller than the main campus of an institution.

Reactions are balanced by equating the right and the left side by stoichiometry coefficients. The redox reactions are balanced and corrected by simplifying the numbers.

A redox reaction is a depiction of the oxidation and the reduction of the reaction that shows the loss and the gain of the electrons by the chemical species.

The oxidation half-reaction:

Mg  →  Mg²⁺ + 2e⁻

The reduction half-reaction:

2Au + 2 e⁻ → 2 Au

The overall balanced reaction is:

Mg(s) + 2Au⁺ (aq)  → Mg²⁺ (aq) + 2Au(s)

Therefore, the reaction is balanced by the oxidation and the reduction halves.

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The "Ring of Responsibility" requires a 15- to 25-foot untreated buffer zone next to water bodies.

A buffer zone is an area of land that separates two or more countries, states, or territories, and is often demilitarized. The purpose of a buffer zone is to provide a space for negotiations and to reduce the possibility of conflict and war. Buffer zones can also be used to protect sensitive natural resources or habitats, such as areas of wilderness or wildlife. Buffer zones can be permanent or temporary, and can range in size from a few miles to hundreds of miles. In addition to physical barriers, buffer zones can also include economic, political, and social measures to reduce tensions between two or more parties. Buffer zones are an important tool in international relations, as they can help to prevent armed conflict and promote peaceful resolution of disputes.

This buffer zone is intended to prevent pollutants from entering the water body and protect it from potential environmental damage.

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Answer:

Yes this is true

Explanation:

Answer:

i have the same question for chemistry, do you have the answer?

Explanation:

Among the given compounds, H\(_2\)S dissolves in water.

The dissolution of compounds in water depends on the polarity of that compound. As water is a polar solvent, polar compounds readily dissolve in water. As it is said that Like dissolves like, we can say that polar and ionic compounds dissolve in polar solvents while, non-polar compounds dissolve in non-polar solvents like benzene, hexane, and other organic solvents.

CBr\(_4\), C\(_6\)H\(_6\), and CCl\(_4\) are non-polar compounds and cannot dissolve in water due to the absence of d-orbital in carbon atoms so they cannot accept lone pairs of electrons from water. H\(_2\)S  is also non-polar but the presence of a large sulfur atom gets easily polarized as compared to carbon and thus it dissolves in water.

Thus, due to the presence of a Sulfur atom, hydrogen sulfide dissolves in water.

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The net ionic equation between HClO4 + NH3:

General steps to writing net ionic equation:

1. Write a balance molecular formula

2. write the state of each substance (l, g, aq or s)

3. Split strong electrolytes to ions

So let us plit from the above equation:

4. Cross out the spectator ions on both sides, in this case cross out ClO4^-

5. The remainingsubstances are the net ionic equation:

Answer:

its sodium hydroxide

Explanation:

Answer:

Natural causes are unintentional.

Explanation:

An example would be a wildfire. This natural disaster spreads quickly, especially in forests where wood burns easily. Destroying forests through burning causes nutrients to get depleted, and organisms die.

Answer: c

Explanation:

different substances can react differently to heat.

Answer: c

Explanation:

different substances can react differently to heat.

Answer:

Bromic Acid

Explanation:

Answer:

A process that involves rearrangement of the molecular or ionic structure of a substance, as opposed to a change in physical form or a nuclear reaction.

Explanation:

Pretty much just not a physical reaction or otherwise

Molar mass - Number of Sugar molecules in 1mL of 10% sugar solution is 2.11 × 10²⁰

What is molar mass ?
Mass per mole is a definition of molar mass. In other terms, molar mass is the total mass of all the atoms in a substance that makes up a mole. It is measured in gram-per-mole units.
For elements or molecules, molar mass is displayed. The molar mass is simply the element's mass represented in atomic mass units in the case of single elements or individual atoms. To put it another way, an atom's atomic mass and molar mass are exactly equal. Molar mass can be used to determine a particle's identification because it is equivalent to atomic mass for individual atoms.

Molar mass of sugar (C₁₂H₂₂O₁₁) = (12×12 + 1×22 + 16×11) g mol⁻¹ = 342 g mol⁻¹

Mass of 1 ml of the solution = (1 ml) × (1.20 g ml⁻¹) = 1.20 g

Mass of sugar in 1 ml of the solution = (1.20 g) × 10% = 0.120 g

Moles of sugar in 1 ml of the solution = (0.120 g) / (342 g mol⁻¹) = 3.509 × 10⁻⁴ mol

Avogadro constant = 6.02 × 10²³ mol⁻¹

No. of sugar molecules = (3.509 × 10⁻⁴ mol) × (6.02 × 10²³ mol⁻¹) = 2.11 × 10²⁰

No. of Sugar molecules in 1mL of 10% sugar solution is 2.11 × 10²⁰

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Answer:

a) Base Peak

b) Base Peak

c) Molecular Ion

d) Base Peak and Radical Cation

e) The Parent Ion, Molecular Ion, the Radical Cation and the Base Peak

Explanation:

a) The Base Peak is assigned a relative intensity of 100.

b) The Base Peak is the most intense peak in the mass spectrum.

c) The Molecular Ion Peak represents the original molecule that has only lost an electron.

d) Base Peak and Radical Cation could be/represent a smaller, charged fragment of the original molecule.

e) The Parent Ion, the Molecular Ion, the Radical Cation/ the Base Peak is/represents a positively charged species.

Answer: Cu is limiting and 1.00 mole of excess S remain

Explanation:

The chemical balanced reaction is:

\(2Cu+S\rightarrow Cu_2S\)  

According to stoichiometry :

2 moles of \(Cu\) require 1 mole of \(S\)

Thus 10.00 moles of \(Cu\) will require=\(\frac{1}{2}\times 10.00=5.00moles\)  of \(S\)

Thus \(Cu\) is the limiting reagent as it limits the formation of product and \(S\) is the excess reagent.

Moles of S left = (6.00-5.00) moles = 1.00 mole

Thus Cu is limiting and 1.00 mole of excess S remain.

Answer:

Coal; H2SO4(sulfuric acid)

Explanation:

Coal has been very helpful in power generation for decades. It has also become a major contributor to global warming, and has major negative effects on human health and the environment.

Coal is formed when dead plant matter submerged in swamp environments is subjected to the geological forces of heat and pressure over hundreds of millions of years. Over time, the plant matter transforms from moist, low-carbon peat, to coal, an energy- and carbon-dense black or brownish-black sedimentary rock.

There are many types of coal. Each type of coal must contain sulfur, which, when burned, releases toxic air pollution. The extent Sulfur content in a given coal sample is largely decided by the conditions under which the coal is formed. Low-sulfur coal usually develop in freshwater environments; high-sulfur coals are formed in brackish swamps.

The burning of coal releases its sulphur content as oxides of sulphur (SOx). These oxides of sulphur dissolve in rain water to form acid rain. Hence rain falling around the Colstrip power plant will contain H2SO4 resulting from the dissolution of SOx in rain droplets.