The density of wind-packed snow is estimated to be 0.35 g/cm^3. A flat roof that is 35 by 43 feet has 28 inches of snow on it. How many pounds of snow are on the roof?

Answer:

100

Explanation:

The balanced chemical equation for the combustion of any hydrocarbon in oxygen is:

CₙHₘ + (n + m/4)O₂ → nCO₂ + m/2H₂O

In this case, we don't have a hydrocarbon, but we can assume that the oxygen is reacting with some substance that contains carbon to produce carbon dioxide. Let's assume that the balanced chemical equation for this reaction is:

C + O₂ → CO₂

From the equation, we can see that 1 mole of carbon reacts with 1 mole of oxygen to produce 1 mole of carbon dioxide. The molar mass of oxygen is 32 g/mol and the given mass is 100 g, so we have:

100 g / 32 g/mol = 3.125 mol of oxygen

Since the balanced chemical equation shows that 1 mole of oxygen reacts with 1 mole of carbon dioxide, we can conclude that 3.125 moles of oxygen will produce 3.125 moles of carbon dioxide.

In a proton-proton chain, four hydrogen nuclei (protons) are combined to form one helium nucleus; 0.7 percent of the original mass is lost mainly by conversion into heat energy, but some energy escapes in the form of neutrinos (ν).

Explanation:

Ammonia (\(NH_3\)) and ammonium chloride (\(NH_4Cl\)) mixture could be a useful buffer in a solution. Option C

A buffer is a solution that can resist changes in pH when small amounts of acid or base are added. It consists of a weak acid and its conjugate base or a weak base and its conjugate acid. The buffer system works by the principle of Le Chatelier's principle, where the equilibrium is shifted to counteract the changes caused by the addition of an acid or a base.

In option A, acetic acid (\(CH_3CO_2H\)) is a weak acid, but hydrochloric acid (HCl) is a strong acid. This combination does not form a buffer because HCl is completely dissociated in water and cannot provide a significant concentration of its conjugate base.

Option B consists of sodium hydroxide (NaOH), which is a strong base, and elemental sodium (Na), which is a metal. This combination does not form a buffer as there is no weak acid-base pair involved.

Option D contains acetic acid (\(CH_3CO_2H\)), a weak acid, and ammonia (\(NH_3\)), a weak base. Although they are weak acid and base, they do not form a buffer system together as they are both weak acids or bases and lack the required conjugate acid-base pair.

Option C, ammonia (\(NH_3\)), is a weak base, and ammonium chloride (\(NH_4Cl\)) is its conjugate acid. This combination can form a buffer system. When ammonia reacts with water, it forms ammonium ions (NH4+) and hydroxide ions (OH-).

The ammonium ions act as the weak acid, while the ammonia acts as the weak base. The addition of a small amount of acid will be counteracted by the ammonium ions, and the addition of a small amount of base will be counteracted by the ammonia, thus maintaining the pH of the solution relatively stable.

Therefore, option C, consisting of ammonia (\(NH_3\)) and ammonium chloride (\(NH_4Cl\)), is the suitable mixture that could be a useful buffer in a solution.

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The compound is unsaturated due to the presence of double bond.

A saturated compound is a compound that have carbon-carbon single bonds while on the other hand, Unsaturated compounds are the compunds having double bonds and triple bonds. We can see that there is double bond between two carbon atoms so we can conclude that the compound is unsaturated due to the presence of double bond.

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Answer:

AKWIJKNZQSOKQPALQALQPALALQLLKILILI

Answer:

Explanation:

1

When elements in group 2 react with Iodine, a salt MI_2 is formed

2

When they react with water, Hydrogen gas is released

3

When they react with Oxygen, an Oxide, MO is formed

4

The most vigorously reactive metal in group 2 is Barium, Ba. Reactivity increases as one moves downward in group 2

5

The most metallic element is Barium, Ba. This is because in the periodic table, metallic strength of metals increases as one moves down the table.

The thing that happens when the elements in group 2 react with iodine is:

The way these elements react with water is:

The way they react with oxygen is:

The element which reacts the most vigorously  in group 2 is:

The element in the group which is the most metallic in character is:

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Answer:

yes that is true........

Answer:

THE ANSWER IS A

Explanation:

In a synthesis reaction, the elements Fe and S might react to form FeS.

Given :

The elements Fe and S might react to form a product,

To find:

The product of the synthesis reaction.

Solution:

The synthesis reaction is a type of chemical reaction in which two more different substances are combined together to give a single product,

When iron (Fe) and sulfur react the product will be formed will have both iron atoms and sulfur atoms.

\(Fe+S \rightarrow FeS\)

In a synthesis reaction, the elements Fe and S might react to form FeS.

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Answer:

Strong winds that blow for a long time over a great distance.

Explanation:

Generally, the biggest and most powerful wind-generated waves are produced by strong storms that blow for a sustained period over a large area. Huge and big waves, or swells, can travel over long distances. The size of the wave depends on wind speed, wind duration, and the area over which the wind is blowing. If The speed of the wind is more, it stays for along time and it covers a larger distance then the waves produced will be very powerful and large.

Answer:

equal and opposite

Explanation:

The size of the forces on the first object equals the size of the force on the second object. The direction of the force on the first object is opposite to the direction of the force on the second object

The mass of hexane, C₆H₁₄ that would be needed to produce 562 grams of carbon dioxide, CO2 is 183 g

We'll begin by writing the balanced equation for the reaction.

2C₆H₁₄ + 19O₂ → 12CO₂ + 14H₂O

From the balanced equation above,

528 g CO₂ were produced from 172 g of C₆H₁₄

With the above information, we shall determine the mass of hexane, C₆H₁₄ needed to produce 562 g CO₂. Details below:

From the balanced equation above,

528 g CO₂ were produced from 172 g of C₆H₁₄

Therefore,

562 g of CO₂ will react to produce = (562 × 172) / 528 = 183 g of C₆H₁₄

Thus, the mass of hexane, C₆H₁₄ needed is 183 g

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Answer:

a it is a

Explanation:

cause i know

The creation of a sugar solution by adding sugar to water then stirring the mixture, then the mass of the sugar and water is the same as the mass of the sugar solution.

A particular kind of homogenous combination made up of two or more components is known as a solution. A solute is a material that has been dissolved in a solvent, which is the other substance in the combination.

A physical process, not a chemical one, takes place when a solute and a solvent combine to produce a solution. When combined, miscible substances like gases form a single phase in all ratios. Phase-separating substances are immiscible.

When one material dissolves, or separates into another, a solution is created. A solute is the name for the material that dissolves to create a solution. A solvent is the material that a solute will dissolve in. Sugar is the solute and water is the solvent in a sugar-water solution.

Thus, option A is correct.

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The enthalpy for the reaction, N\(_2\)(g) + 1/2 O\(_2\)(g) →N\(_2\)O(g) is +81.5. among all the given options, the correct option is option A.

The amount of heat inside a system is measured as enthalpy. This heat is used to cause a process to occur. Enthalpy is indeed a thermodynamic quantity since every system that involves heat is referred to be a thermodynamic system.

Additionally, it is important to remember that each system has a number of players. These individuals each have their own pressure and volume. We already know that the ratio of a system's pressure to its volume is constant.

N\(_2\)(g) + 1/2 O\(_2\)(g) →N\(_2\)O(g)

i)2 NH\(_3\)(g) + 3 N\(_2\)O(g) → 4N\(_2\)(g) + 3 H\(_2\)O(l) ∆H°/kJ= -1010 KJ

ii)4 NH\(_3\)(g) + 3 O\(_2\)(g)  → 2 N\(_2\)(g) + 6 H\(_2\)O(l) ∆H°/kJ = -1531 KJ

Multiply second equation with 4 and first equation with 2. Now substract third equation from fourth equation.

N\(_2\)(g) + 1/2 O\(_2\)(g) →N\(_2\)O(g)  ΔH=+81.5

Therefore, the enthalpy for the reaction, N\(_2\)(g) + 1/2 O\(_2\)(g) →N\(_2\)O(g) is +81.5.

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Answer:

5.01 moles

Explanation:

Calculate the number of moles in 400g of Tio2

first, write the formulas correctly

Calculate the number of moles in 400g of TiO2

capitalize the first letter of your elements

the molar mass of TiO2 is

47.88 +2X16.00 =47.88  +32.00 = 79.88 gm/mole

(to 3 sig fig = 79.9 gm/mole

400 gm/79.9 gm/mole = 400/79.9 mole gm/gm =

400/79.9 moles = 5.01 moles

1)K = p\(PCl_{3}\). p\(Cl_{2}\)/p\(PCl_{5}\)

2) K = p\(PCl_{3}\). p\(Cl_{2}\)/p\(PCl_{5}\)

3) The partial pressures of the other two is 0.39 bar

The reactant and product concentrations in a chemical reaction at equilibrium are related by the equilibrium constant, abbreviated K. It is the ratio of the product and reactant concentrations, each raised to the power of their respective stoichiometric coefficients.

We know that;

K = p\(PCl_{3}\). p\(Cl_{2}\)/p\(PCl_{5}\)

Given that the pressure of the phosphorus tri chloride is 1

0.15 =\(x^2\)/1

\(x^2\) = 0.15 * 1

x = √0.15

x = 0.39 bar as shown

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A nuclear reaction is indeed a process in nuclear physics including nuclear chemistry. Therefore, the reaction is ¹³³I₅₃  +   ⁰e₋ \(\rightarrow\) ¹³³Te₅₂.

A nuclear reaction is indeed a process in nuclear physics including nuclear chemistry wherein two nuclei, or perhaps a nucleus as well as an external quantum particle, collide to form one or even more new nuclides.

As a result, a nuclear reaction should result in the transformation with at least one nuclide. If a nuclear interacts with some other nucleus as well as particle and then separates without affecting the structure of any nuclide, this is referred to be a nucleotide interaction.

¹³³I₅₃  +   ⁰e₋ \(\rightarrow\) ¹³³Te₅₂

Therefore, the reaction is ¹³³I₅₃  +   ⁰e₋ \(\rightarrow\) ¹³³Te₅₂.

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The mass of the solid aluminum that forms are 192.73 grams

To determine the mass of solid aluminum that forms, we need to use stoichiometry and the balanced chemical equation for the reaction between magnesium and aluminum nitrate.

The balanced chemical equation is:

3 Mg + 2 Al(\(NO_{3}\))3 → 3 Mg(\(NO_{3}\))2 + 2 Al

The equation shows that 3 moles of magnesium react with 2 moles of aluminum to produce 2 moles of aluminum nitrate.

To calculate the mass of solid aluminum, we need to know the amount of magnesium used. Given that the volume of the magnesium is 150.0 mL and its density is 1.738 g/cm³, we can calculate the mass of magnesium using the formula:

Mass = Volume × Density

Mass of magnesium = 150.0 mL × 1.738 g/cm³ = 260.7 g

Now, using the molar mass of magnesium (24.31 g/mol) and the molar ratio from the balanced equation, we can determine the moles of magnesium used:

Moles of magnesium = Mass of magnesium / Molar mass of magnesium

= 260.7 g / 24.31 g/mol

= 10.72 mol

According to the stoichiometry of the balanced equation, the ratio of moles of magnesium to moles of aluminum is 3:2. Therefore, the moles of aluminum formed will be:

Moles of aluminum = (2/3) × Moles of magnesium

= (2/3) × 10.72 mol

= 7.15 mol

Finally, we can calculate the mass of solid aluminum using its molar mass (26.98 g/mol):

Mass of aluminum = Moles of aluminum × Molar mass of aluminum

= 7.15 mol × 26.98 g/mol

= 192.73 g

Therefore, the mass of the solid aluminum that forms is approximately 192.73 grams.

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The number of moles of H₂O in the thimble of water is approximately 0.00664 mol. The answer is option B) 6.6 x 10⁻³

The number of molecules in a substance is related to Avogadro's number (6.022 x 10²³ molecules/mol) by the formula:

number of molecules = number of moles x Avogadro's number

We are given that there are 4.0 x 10²¹ molecules of water. To find the number of moles of water, we need to rearrange the formula and solve for moles:

number of moles = number of molecules / Avogadro's number

number of moles = 4.0 x 10²¹ molecules / 6.022 x 10²³ molecules/mol

number of moles = 0.00664 mol

The number of moles of H₂O in the thimble of water is approximately 0.00664 mol. The answer is option B) 6.6 x 10⁻³

The quantity of substance in a system is represented by a measurement unit called a mole. A material is said to have one mole if there are exactly as many atoms, molecules, or ions in one mole of it as there are in 12 grams of carbon-12.

It is practical to quantify substance concentrations in chemical reactions and other chemical processes using moles. It enables chemists to deal with quantifiable amounts of substances, like grams, and to quickly convert these amounts to a standard unit of measurement, like moles.

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The volume of the platinum solid is determined as 8.16 cm³.

The volume of the  platinum solid is calculated from its density and mass as shown below.

V = m/ρ

where;

Volume of the platinum solid is calculated as follows;

V = 175 g / 21.45 g/cm³

V = 8.16 cm³

Thus, the volume of the platinum solid is determined as 8.16 cm³.

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The balanced molecular equation for the reaction between sodium hydroxide (NaOH) and aluminum chloride (\(AlCl_3\)) in aqueous solution can be written as follows: 2NaOH(aq) + 3\(AlCl_3\)(aq) → 3NaCl(aq) + \(Al(OH)_3\)(s)

In this reaction, sodium hydroxide (NaOH) reacts with aluminum chloride (\(AlCl_3\)) to form sodium chloride (NaCl) and aluminum hydroxide (\(Al(OH)_3\)). The coefficients in the balanced equation indicate the stoichiometric ratio between the reactants and products.

The physical states of the substances are indicated by the symbols (aq) for aqueous solutions and (s) for the solid precipitate.

The reaction is a double-displacement reaction, also known as a precipitation reaction. Double-displacement reactions involve the exchange of ions between two compounds, resulting in the formation of a precipitate.

In this case, sodium hydroxide and aluminum chloride react to form sodium chloride and aluminum hydroxide, with aluminum hydroxide being the white solid precipitate.

It's worth noting that the actual reaction might involve hydrated forms of the compounds, such as NaOH·x\(H_2O\) and \(AlCl_3\)·y\(H_2O\). However, for simplicity, these hydrated forms are not included in the balanced equation.

Overall, the balanced equation represents the chemical reaction between sodium hydroxide and aluminum chloride, showing the reactants, products, and their stoichiometric ratios.

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Answer:

Chemical Change

Explanation:

Chemical changes occur when bonds are broken and/or formed between molecules or atoms. This means that one substance with a certain set of properties (such as melting point, color, taste, etc) is turned into a different substance with different properties.

Excess carbon dioxide in the atmosphere contributes to climate change by trapping heat in the Earth's atmosphere, leading to a range of adverse impacts on our climate.

Here are some of the ways excess carbon dioxide affects our climate:

Global warming: Carbon dioxide is a greenhouse gas, which means it traps heat in the Earth's atmosphere, leading to a rise in global temperatures. This increase in temperature can lead to a wide range of adverse impacts such as sea level rise, more frequent and severe heatwaves, droughts, and wildfires.

Ocean acidification: The excess carbon dioxide in the atmosphere is absorbed by the oceans, leading to increased acidity. This change in the chemistry of the oceans can have severe impacts on marine ecosystems, particularly on organisms such as corals and shellfish that build shells or skeletons out of calcium carbonate.

Changes in precipitation patterns: The increased temperatures caused by excess carbon dioxide can lead to changes in precipitation patterns, resulting in more intense and frequent extreme weather events such as floods and droughts.

Melting of ice caps and glaciers: The warming of the Earth's atmosphere caused by excess carbon dioxide is leading to the melting of ice caps and glaciers. This melting is contributing to sea level rise, which has significant impacts on coastal communities and infrastructure.

Changes in ecosystems: The warming of the Earth's atmosphere caused by excess carbon dioxide can lead to changes in ecosystems, including shifts in plant and animal distributions, changes in the timing of seasonal events, and the loss of biodiversity.

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The molecular weight of oxygen gas is 32 grams per mole, and we calculate the weight of the atmosphere based on this estimate.

Solution:

PV = nRT

6.30 x 1.95 = n x 12.285 x 290

n = 0.6226 moles.

The molar weight of oxygen gas is 32 grams, mol on which to estimate the atmospheric weight. Irregular Edges Edges are often jagged chipped or blurred. The pigment can spread to the surrounding skin. Uneven Colors Black brown and tan shades may be present. White, gray red, pink, or blue areas can also be seen.

If the mole is larger than other moles has dirty or uneven edges is uneven in color, or is slightly pink see a doctor for an examination. please give me. Bruises that appear in adulthood should be checked. However, the most worrying sign is the change in the mole. Experts believe that genetic factors, hormonal changes, and sun damage can cause new moles to suddenly appear, but no one knows for sure.

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The temperature increase from 20 °C to 46 °C indicates that the reaction between zinc and copper sulfate solution is exothermic, with heat being released into the surroundings.

In the given reaction between zinc and copper sulfate solution, the temperature change can provide insights into the type of heat change occurring during the reaction. Based on the provided information, the initial temperature of the copper sulfate solution was 20 °C, and the final temperature of the mixture after the reaction was 46 °C.

The temperature increase observed in this reaction indicates an exothermic heat change. An exothermic reaction releases heat energy into the surroundings, resulting in a temperature rise. In this case, the reaction between zinc and copper sulfate solution is exothermic because the final temperature is higher than the initial temperature.

During the reaction, zinc displaces copper from copper sulfate to form zinc sulfate and copper metal. This displacement reaction is known as a single displacement or redox reaction. Zinc is more reactive than copper and therefore replaces copper in the compound.

The formation of new chemical bonds during the reaction releases energy in the form of heat. This energy is transferred to the surroundings, leading to an increase in temperature. The heat released is greater than the heat absorbed, resulting in a net increase in temperature.

The exothermic nature of this reaction can be explained by the difference in bond energies between the reactants and products. The breaking of bonds in the reactants requires energy input, while the formation of new bonds in the products releases energy.

In this case, the energy released during the formation of zinc sulfate and copper metal is greater than the energy required to break the bonds in copper sulfate and zinc.

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Answer:

See the image that I attached.

Explanation:

Answer:

1.806 x 10^24 atoms of Au

Explanation:

591/197 = 3 mol Au

3 x (6.02 x 10^23) = 1.806 x 10^24 atoms of Au

The connection between increasing carbon dioxide and increasing temperature is: carbon dioxide absorbs heat from the sun and traps it in earth's atmosphere. Since the heat cannot escape, it causes the earth's temperature to increase which is the first option.

When carbon dioxide (CO₂) and other greenhouse gases are present in the atmosphere, they act as a natural blanket, allowing sunlight (solar radiation) to pass through and reach the Earth's surface. Some of this solar radiation is absorbed by the Earth's surface, while the rest is reflected back towards space as heat (infrared radiation). However, greenhouse gases like carbon dioxide have the property of absorbing and re-emitting infrared radiation.

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Three statements regarding autotrophs and heterotrophs on Earth that true are:

The other statements are incorrect. The following are the rationales:

The statements that are true are 4, 5, and 8, as heterotrophs are dependent on autotrophs for the generation of O2 to support aerobic respiration and the conversion of light energy to chemical energy, and the majority of autotrophs on Earth require aerobic respiration in order to survive.

This question should be provided as:

Which three of the following statements about autotrophs and heterotrophs on Earth are true?

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