PLEASE PLEASE HELP CHEMISTRY
Sulfur (2.56 grams) was burned in a calorimeter with excess 02(g) . The temperature increased from 21.25C to 26.72C. The bomb had a heat capacity of 923 J/C, and the calorimeter contained 815 grams of water
Calculate the heat evolved as the sulfur burned:
Calculate the heat per mole of SO2 formed in the course of the reaction
S(s) + O2 (g) SO2 (g)

Answer:

4P + 3O2 → P4O6

Explanation:

Chemical Equation Balancer Online!

The balanced chemical equation can be represented for the given reaction as:

\(4\;P + 3\;O_2\longrightarrow P_4O_6\)

A chemical equation for a chemical reaction can be represented in terms of chemical symbols of the reactants and products. A balanced chemical equation in which the number of atoms of reactants and products is equal on either side of the equation.

The law of conservation of mass gives the idea that the total mass of both the reactant side and the product side is equal in a balanced chemical equation.

The given chemical equation has the given reaction:

\(4\;P + 3\;O_2\longrightarrow P_4O_6\)

The number of phosphorous and oxygen atoms are equal on both sides of the arrow therefore it is a  balanced chemical equation. Therefore, the mass of the phosphorus and oxygen elements will be equal on the reactant as well as product side.

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Answer:

3Fe2O3 + H2 --> 2Fe3O4 + H2O

Answer:

Imagewww.chem.purdue.edu › Equilibrium

Calculating the Hydroxide Ion Concentration from pOH

To calculate the pH of an aqueous solution you need to know the concentration of the hydronium ion in moles per liter ...

Calculating pH

Calculating hydronium ion ...

Calculating pOH

Calculating hydroxide ion ...

Calculating pKa

People also ask

How do you find hydronium ion concentration when given pH?

The hydronium ion concentration can be found from the pH by the reverse of the mathematical operation employed to find the pH. [H3O+] = 10-pH or [H3O+] = antilog (- pH) Example: What is the hydronium ion concentration in a solution that has a pH of 8.34? On a calculator, calculate 10-8.34, or "inverse" log ( - 8.34).

The calculated molecular weight of butane would not be affected if some of the bubbles escaped into the air instead of entering the cylinder.

The molecular weight of a substance is a fundamental property of the substance and is determined by the number and type of atoms in its molecular structure. It is independent of the amount or physical state of the substance. Thus, if some of the bubbles of butane escape into the air, the molecular weight of the remaining butane in the cylinder remains unchanged. The effect of this escape would only be seen in the measured volume or mass of the butane in the cylinder, which would be lower than the expected value if all the butane had been captured.

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The missing part of the equation is found to be 4/2He. Option A

The term nuclear equations have to do with the type of equation in which one type of nucleus is transformed into another sometimes by the bombardment or loss of a particle.

Now the full equation ought to be written as 7/3Li + 1/1H -----> 4/2He + 4/2He. This is because the total mass on the left is 8 and the total charge on the left is 4.

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Therefore, the pH of the solution after adding 2.78 mL of 0.0471 M HCl to the 25.1 mL of 0.50 M ammonia is 6.66.

How to solve the problem?

Ammonia (NH₃) is a weak base, meaning that it does not completely dissociate in water. Instead, it accepts a proton from water to form the ammonium ion (NH₄₊) and hydroxide ion (OH-). The equation for this reaction is:

NH₃+ H₂O ↔ NH₄₊+ OH-

The equilibrium constant for this reaction is known as the base dissociation constant (Kb) for ammonia and has a value of 1.8 × 10⁻⁵at 25°C.

To determine the pH of a 25.1 mL solution of 0.50 M ammonia, we need to calculate the concentration of hydroxide ions (OH-) produced by the reaction. We can do this by using the Kb expression and the initial concentration of ammonia:

Kb = [NH₄₊][OH-]/[NH₃]

Assuming that the concentration of NH₄₊ is negligible compared to the concentration of NH₃, we can simplify the expression to:

Kb = [OH-]²/[NH₃]

Solving for [OH-], we get:

[OH-] = sqrt(Kb × [NH₃]) = sqrt(1.8 × 10⁻₅ × 0.50) = 7.6 × 10⁻³ M

To find the pH, we use the equation:

pH = 14 - pOH = 14 - log([OH-]) = 14 - log(7.6 × 10⁻³) = 11.12

Therefore, the pH of the 25.1 mL solution of 0.50 M ammonia is 11.12.

If we add 2.78 mL of 0.0471 M HCl to the ammonia solution, we are adding a strong acid that will react with the weak base NH3. The equation for this reaction is:

HCl + NH₃↔ NH₄+ + Cl-

Assuming that the concentration of NH3 is still 0.50 M, we can use the equilibrium constant for this reaction to calculate the concentration of the ammonium ion:

Ka = [NH₄+][Cl-]/[NH₃]

The equilibrium constant for this reaction is the acid dissociation constant (Ka) for ammonium ion and has a value of 5.6 × 10⁻¹⁰ at 25°C.

Solving for [NH₄+], we get:

[NH₄+] = Ka × [NH₃]/[Cl-] = 5.6 × 10⁻¹⁰ × 0.50/0.0471 = 5.9 × 10⁻⁹ M

The concentration of hydroxide ions (OH-) can now be calculated by using the Kb expression and the new concentration of NH4+:

Kb = [NH₄+][OH-]/[NH₃]

Assuming that the concentration of NH3 is still 0.50 M, we can simplify the expression to:

Kb = [OH-]²/[NH₄₊]

Solving for [OH-], we get:

[OH-] = sqrt(Kb × [NH₄₊]) = sqrt(1.8 × 10⁻⁵ × 5.9 × 10⁻⁹) = 2.2 × 10⁻⁷M

To find the pH, we use the equation:

pH = 14 - pOH = 14 - log([OH-]) = 14 - log(2.2 × 10⁻⁷) = 6.66

Therefore, the pH of the solution after adding 2.78 mL of 0.0471 M HCl to the 25.1 mL of 0.50 M ammonia is 6.66. This indicates that the solution has become more acidic due to the addition of the strong acid HCl. The pH has decreased from 11.12 to 6.66, which is a significant change. The solution has moved from being basic to being slightly acidic. This change in pH could have important implications for any chemical reactions or biological processes that occur in the solution, as many reactions are pH-dependent. It is important to note that the calculation assumes that the volumes of the solutions are additive and that the temperature and pressure are constant.

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Answer:

Answer 1

light energy from the sun.

answer 2

Microscopic organisms are tiny life forms, often consisting of a single cell. ... Algae — these are single celled plants also known as phytoplankton (from the Greek, meaning drifting plants)

answer 3

Some phytoplankton are bacteria, some are protists, and most are single-celled plants. Among the common kinds are cyanobacteria, silica-encased diatoms, dinoflagellates, green algae, and chalk-coated coccolithophore

Explanation:

it uses light to convert water and carbon dioxide molecules into glucose (sugar molecule) and oxygen

According to contemporary thermodynamics, heat is the system's overall internal energy. Two properties were defined in order to measure the heat energy related to matter and its relationship to temperature.

The amount of heat needed to raise a substance's temperature by one degree is known as its heat capacity. The entire internal energy of a system is measured in terms of heat energy. Both the system's overall kinetic energy and the molecules' potential energy are included in this.

The heat required is:

q = mc (T₂ - T₁)

50000 = m × 75.3  (1.00 - 20.00)

m = 50000 / 75.3  (1.00 - 20.00)

m = -34.9 = 34.9

Molar mass of water = 18 g/mol

n = 34.9 / 18 = 1.93 mol

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Answer:

A bee sting has a ph of 5, and is therefore an acid. Litmus paper goes red (or stays red) in acidic solutions.

Answer:

The Blue Litmus Paper should turn red

Explanation:

Bee venom has a pH of 5.5, which means it is mildly acidic which in turn should make the Litmus paper turn Red. Hope this helps!

Answer:

Examples of longitudinal waves include: sound waves. ultrasound waves. seismic P-waves.

Explanation:

Answer:

Trends on the Periodic Table have a vertical component and a horizontal component. Vertical trend: as more “shells” are added to the electron cloud, it expands. Horizontal trend: if atoms have the same number of “shells”, atoms with more protons will draw the electron cloud in tighter.

Explanation:

Answer:

Salt is the pure substance out of them all.

Answer: Salt is a pure substance. Pure substances are composed of one type of molecule. All of the substances listed are composed of two or more types of molecules, except for salt. Therefore, salt would be your answer.

Hope this helps.

Based on the principles of fluid mechanics and erosion, the water in the river flows faster on the outside of the bend and slower on the inside.

Meandering rivers are formed due to the lateral erosion of the riverbank, which creates a curvy path for the water to flow. This is caused by the differences in water velocity between the outside and inside bends of the river.

The above difference in velocity causes the water on the outside to exert more erosive force on the bank, leading to more erosion on the outside of the curve. The slower-moving water on the inside, by contrast, tends to deposit sediment, which can result in the formation of sandbars and other features.

Therefore, it is likely that there is more erosion on the outside of the curve in the riverbed as water flows through it.

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A student measures the molar solubility of silver carbonate in a water solution to be 1.24 × 10⁻⁴ M. Based on her data, the solubility product constant for this compound is 7.63 × 10⁻¹² M³.

Stoichiometry helps us use the balanced chemical equation to measure quantitative relationships and it is to calculate the amounts of products and reactants that are given in a reaction.

Silver carbonate dissociates as follows

Ag₂CO₃ (s) ⇄ 2Ag⁺ (aq) + CO₃⁻² (aq)

To find the solubility product constant use the expression

\(K_{sp} = [A^{+}]^{a} [B^{-}]^{b}\)

where

\(K_{sp}\) = Solubility product constant

A⁺ = cation in an aqueous solution

B⁻ = anion in an aqueous solution

a, b = concentration of a and b

Molar Solubility (S) = 1.24 × 10⁻⁴ M

Solubility, Ag⁺ = 2S

Solubility, CO₃⁻² = S

Put the value in above expression, we get

\(K_{sp} = [A^{+}]^{a} [B^{-}]^{b}\)

       = [Ag⁺]² [CO₃⁻²]¹

       = [2S]² [S]¹

       = 4S² × S

       = 4S³

       = 4 × ( 1.24 × 10⁻⁴ M)³

       = 7.63 × 10⁻¹² M³

Thus from the above conclusion we can say that A student measures the molar solubility of silver carbonate in a water solution to be 1.24 × 10⁻⁴ M. Based on her data, the solubility product constant for this compound is 7.63 × 10⁻¹² M³.

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Disclaimer: The question was given incomplete on the portal. Here is the complete question.

Question: A student measures the molar solubility of silver carbonate in a water solution to be 1.24 × 10⁻⁴ M. Based on her data, the solubility product constant for this compound is ..........

Answer:

valence electrons are the electrons that are located in the outermost electron shell of an element. Knowing how to find the number of valence electrons in a particular atom is an important skill for chemists because this information determines the kinds of chemical bonds that it can form and, therefore, the element's reactivity

Explanation:

The value of ΔGo for the reaction at 298 K is 129 kJ/mol.

To calculate ΔGo, we use the equation: ΔGo = ΔHo - TΔSo, where ΔHo is the standard enthalpy change, T is the temperature in Kelvin, and ΔSo is the standard entropy change.

First, we need to calculate the standard enthalpy change for the reaction by summing up the standard enthalpies of formation for the products and subtracting the sum of the standard enthalpies of formation for the reactants: ΔHo = [2(-114) + (-398)] - [-524] = 96 kJ/mol

Next, we calculate the standard entropy change for the reaction by summing up the standard entropies of the products and subtracting the sum of the standard entropies of the reactants: ΔSo = [2(196) + 36] - [50 + 2(192)] = -114 J/mol K

Now we can plug in the values to calculate ΔGo: ΔGo = 96 - 298(-114/1000) = 129 kJ/mol

Therefore, the value of ΔGo for the reaction at 298 K is 129 kJ/mol.

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Answer:

Sodium hydroxide is very corrosive. It can cause irritation to the eyes, skin, and mucous membrane; an allergic reaction; eye and skin burns; and temporary loss of hair. Workers may be harmed from exposure to sodium hydroxide.

Explanation:

How to reduce:

Inhalation: Move victim to fresh air.

Skin Contact: Avoid direct contact

Eye Contact: Avoid direct contact

Ingestion: Have victim rinse mouth with water.

A phase diagram is a plot of temperature on the x-axis vs. pressure on the y-axis.

This diagram shows the stable regions for each phase of matter (solid, liquid, gas) and the conditions under which these phases may exist in equilibrium.

A phase diagram is a graphical representation that illustrates the relationship between temperature, pressure, and the phases of a substance. The x-axis of the phase diagram represents temperature, usually in degrees Celsius or Kelvin, while the y-axis represents pressure, typically in units like atmospheres or kilopascals.

The phase diagram outlines the different regions or regions where each phase of matter (solid, liquid, or gas) is stable under specific temperature and pressure conditions. The boundaries between these regions represent phase transitions, such as melting, boiling, or sublimation.

By examining a phase diagram, one can determine the conditions at which a substance exists in a particular phase and the conditions required for phase transitions to occur. The phase diagram provides valuable information about the behavior and stability of substances under different temperature and pressure conditions.

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The salt obtained from the combination of the weak acid cyanic acid, hcno, and the weak base ammonia, nh3, is used to make an aqueous solution. is the solution basic.

The weak acid of such a buffer system is created when it interacts with both the conjugate base of the buffer system. The pH then just slightly declines, the weak acid concentration rises, and the conjugate base concentration falls.

The acid and base would react to create an acidic solution in a weak base-strong acid titration. During the titration, a conjugate acid would be created, which will subsequently react with water to create hydronium ions. Consequently, a solution with such a pH under 7 is produced.

Therefore, The salt obtained from the combination of the weak acid cyanic acid, hcno, and the weak base ammonia, nh3, is used to make an aqueous solution. is the solution basic.

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The genotype and phenotype ratio for the first cross will be 100% Rr and 100% round, while the second cross will be 1RR:1Rr, 50/50 round and wrinkled respectively.

Assuming that the seed shape allele is R(r).

For the first cross:             RR    x    rr

                                        Rr   Rr   Rr   Rr

Genotype ratio = 100% Rr

Phenotype ratio = 100% round

For the second cross:           RR    x    Rr

                                             RR   Rr   RR   Rr

Genotype ratio = 1RR : 1Rr

Phenotype ratio = 50% round and 20% wrinkled.

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Answer:

The circulatory system brings blood through the kidneys where nitrogenous wastes can be filtered. The urinary system helps the circulatory system by maintaining salt balance in the body and adjusting blood pressure by getting rid of or holding on to more water.

Explanation:

Leonard uses a gas stove in a poorly ventilated kitchen, the gas which could rise to dangerous levels in Leonard's kitchen is Carbon Monoxide, option B.

Carbon monoxide is a toxic, combustible gas that has no colour, flavour, or taste and is slightly less dense than air.

When carbon monoxide accumulates in your bloodstream, it causes carbon monoxide poisoning. When there is an excessive amount of carbon monoxide in the air, your body replaces the oxygen in your red blood cells with carbon monoxide. This can result in severe tissue damage or even death.

Carbon monoxide is a colourless, odourless, and tasteless gas that is created when gasoline, wood, propane, charcoal, or any fuel is burned. Improperly vented appliances and engines, particularly in a closely sealed or enclosed location, may allow lethal quantities of carbon monoxide to develop.

If you suspect that you or someone you're with has carbon monoxide poisoning, get some fresh air and seek immediate medical attention.

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Answer:

It's funny cause i'm doing the same exact thing as you.

Explanation:

You need to go to the Gizmo, and it explains everything. But When you're looking at "Valence Electrons" thats how many "dots" (electrons) there are on the outermost circle, so Fluorine has 7 Valence Electrons.   To find the valency, you need to first identify the Valence Electrons. Fluorine has 7 valence electrons, and it would be a lot easier for this atom to gain an electron, rather than lose 7. So 8-7 is 1, meaning the Valency of Fluorine will be 1. For the sum, just add the total number, so 7+1 is 8, so the sum of Fluorine will be 8. This is confusing, so I'm sorry if this doesn't make sense.

Answer:

Explanation:

not sure if this is totally correct but checked with classmates and this seems to be around what most got

Answer:

110.21 g/mol

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

Answer:

110.22 g in 2.75 moles of calcium

Explanation:

to convert moles to grams

moles (g/mol)

2.75 mol Ca (40.08 (atomic weight) g Ca/1 mol Ca)= 110.22

Answer:

D

Explanation:

1/2 will be lit with 'daylight' and the other half will be dark

When conducting a search for nanomaterials using Quick Search it provides several criteria for refining search results related to nanomaterials, including the number of versions, tags, topic, and format type.

The number of versions, allows users to filter search results based on the number of versions available for a specific article or document. This is useful for finding the latest or most up-to-date information on nanomaterials. It helps users to narrow down their search results by selecting specific keywords or phrases related to nanomaterials.

It allows users to filter their search results by selecting specific topics related to nanomaterials. This can include areas such as nanotechnology, materials science, and chemistry. Format type enables users to refine their search results based on the type of file format they prefer.

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The complete question is:

Quick Search lets you refine or narrow your search results using links on the right side of the screen. Do a search on nanomaterials. What are some criteria that can refine your search results in Quick Search?

Answer:

Vi=0

Vf=10m/s

t=5s

a=?

Explanation:

a=Vf-Vi/t

a=10-0/5

a=10/5

a=2m/s^2