What is the change in enthalpy when 9. 75 g of aluminum reacts with excess ammonium nitrate according to this equation: 2Al + 3NH4NO3 = 6H20 + Al2O3. H = 2030 kJ

Answer:

a globe

snow rain clouds

Strong acids and bases, HCl and NaOH, respectively, have titration curves that resemble one another (curve form) at various concentrations.

The condition of both the reactants and the products is water. The HCl + NaOH reaction's key variables, formulae, and titration curve. NaOH and HCl react in a 1:1 ratio (equal amounts).

Aqueous HCl acid solution and Aqueous NaOH solution are both present in each beaker. When no additional NaOH is added, the pH initially depends on the concentration of NaOH, and when HCl concentration rises, the pH value rises. As soon as HCl is present in the flask, the titration curve is complete.

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The compound is formed by 1 atom of gold and 3 atoms of chlorine.

In this case, the gold atom must have a charge of +3 in order to have a compound with a net charge of zero because the molecule Cl3 has a charge of -3. This is why the name of the compound is Gold(III) Chloride.

Answer:

2Li + ZnBr2 ->2LiBr + Zn

3Ca + Al2O3 ->2Al + 3CaO

Explanation:

Spontaneous reactions are reactions that can happen on their own. For a spontaneous reaction to occur, a metal that is higher in the activity series must displace a metal that is lower in the activity series from its solution and not vice versa.

If we look at the two reactions selected in the answer, lithium is above zinc in the activity series and calcium is above aluminum in the activity series hence the two reactions occur spontaneously.

The molecular formula of the compound which has a molecular weight of 112.124 atomic mass units is C₆H₈O₂.

Molecular formula of any compound tells about the composition and numbers of each entities present in that molecule.

Steps involved in the prediction of molecular formula:

      Molar mass of C₃H₄O = 3(12) + 4(1) + 16 = 56

        112.124/56 = 2

        Molecular formula = (C₃H₄O)₂ = C₆H₈O₂

Hence correct option is (E).

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Answer:

Zebra- consumer

Tiger- consumer

Worm- decomposer

Tree-Producer

Molded bread- decomposer

Plant- producer

Answer:

Explanation:

Dandelion plant produces light and feathery seeds .

Zebra consumes / eats grass so it is a consumer .

Any time a charged particle, like an electron, modifies its velocity, electromagnetic radiation is created that is every time it accelerates or slows down. The charged particle loses the energy of the electromagnetic radiation that is subsequently created as a result.When an atom absorbs energy, it emits electromagnetic radiation.

One or more electrons in the atom move to a different location as a result of the energy being absorbed. An electromagnetic wave is created when the electron reposition itself.Atoms may absorb energy in a variety of ways. Electrical energy can be used as one method of atom excitation. Neon signs display this for you. The neon atoms will become excited or gain energy when we run electricity through the neon tubes.

In this state, the electrons in these atoms are very energetic. The electrons will return to their low energy state and emit radiation that we see as light since they don't enjoy being in the high energy state.

Answer:



Explanation:

Answer:

added to what? base? if its added to base then it will increase in pH. H2S04(sulphuric acid is strong) so the pH is ard 3

Mt. Whitney has the second lowest elevation .

Low altitude means any elevation equal to or less than 1219 meters

(4000feet) .

Mt. Whitney is located at the southeastern end of the Sierra Nevada. It is only 85 miles northwest from badwater Basin in death valley,which at 86 meters below at sea level is the lowest point in all North America.

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Vanadium(V) oxide is the inorganic compound with the formula V₂O₅. Commonly known as vanadium pentoxide, it is a brown/yellow solid, although when freshly precipitated from aqueous solution, its colour is deep orange. Because of its high oxidation state, it is both an amphoteric oxide and an oxidizing agent.

formula:V2O5

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Answer:

is it vanadium v oxide or just vanadium oxide

Explanation:

The value of δh≠ for this reaction in the temperature range between 110°C and 280°C is -164 kJ/mol.

The question can be calculated using the Arrhenius equation. The Arrhenius equation relates the rate constant, k, to the activation energy, Ea, and the temperature, T:

                               k = A exp(-Ea/RT)

Where A is the pre-exponential factor, R is the gas constant, and T is the temperature. Rearranging the equation to solve for Ea gives:

Ea = -RT ln(k/A)

Substituting the given values for k and R into the equation and solving for Ea gives:
Ea = -(8.314 J/mol-K)(383.15 K) ln(3.2×10¹⁶ s⁻¹/ A)
Ea = - 164 kJ/mol

Therefore, the value of δH≠ is -164 kJ/mol.

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Answer: it’s carbon dioxide

Explanation:

This is it because decomposition takes place when carbonic acid breaks down So that’s why I put carbon dioxide

Answer:

carbon dioxide

Explanation:

in our country .we have to study it by heart.

trust me

Answer:

Nitrogen is a diatomic molecule in the VA family on the periodic table. Nitrogen has five valence electrons, so it needs three more valence electrons to complete its octet. A nitrogen atom can fill its octet by sharing three electrons with another nitrogen atom, forming three covalent bonds, a so-called triple bond.

maybe this will be helpful

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Answer:

Two covalent bonds form between the two oxygen atoms because oxygen requires two shared electrons to fill its outermost shell. Nitrogen atoms will form three covalent bonds (also called triple covalent) between two atoms of nitrogen because each nitrogen atom needs three electrons to fill its outermost shell.

The number of electrons in an atom's outermost valence shell governs its bonding behaviour. Elements whose atoms have the same number of valence electrons are grouped together in the Periodic Table. ... To form a covalent bond, one electron from the halogen and one electron from another atom form a shared pair.

Answer:

She remembered what she had learned about the cell theory as she observed the protists moving. Which three ideas are included in the cell theory ..

Explanation:

We should heavy cream be chilled before whipping because that is cream  too warm is little hard to whip and it will curdles easily.

The whipping cream will be stored in the refrigerator for some times because if the whipping cream is too warm so, it will be little hard and it will curdles easily. The first sign that the cream is becoming overwhipped is the  grainy appearance to the cream. When the cream is overwhipped it will separates into the butter and the whey.

Thus , because of the reason that is cream  too warm is little hard to whip and it will curdles easily.

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Answer:

13.3042 x 10^23

Explanation:

2.21 Cl x (6.02 x 10^23) = 13.3042 x 10^23

Moles to molecules are converted by multiplying the moles to the formula of molecules which is (6.02 x 10^23)

Answer:

A. gold has the highest monetary value?

Among the given elements, gold has the highest monetary value. So the correct option is A.

Gold (Au) is a chemical element that belongs to Period 6's Group 11 (Ib) and is a thick, glossy golden valuable metal. Gold has historically been extremely valued due to a number of characteristics. It is typically found in nature in a relatively pure form, is appealing in colour and brightness, resilient to the point of virtual indestructibility, and very flexible.

Due to its perceived worth from the beginning, gold has a history that is unmatched by that of any other metal. Gold is one of the densest metals.

It is a good heat and electrical conductor. It is also the softest, most malleable, and ductile of all the elements; a troy ounce (31.1 grammes) of gold may be hammered into gold leaf, which can be crushed into sheets as thin as 187 square feet (approximately 17 square metres).

Therefore the correct option is A.

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False Polar molecules do contain polar bonds, but non-polar molecules do not contain polar bonds. A polar bond is a covalent bond in which electrons are shared unequally between two atoms, resulting in a partial positive charge on one atom and a partial negative charge on the other. A polar molecule is one in which the distribution of electrons is not symmetric, resulting in a dipole moment and an overall partial positive and partial negative charge.

On the other hand, non-polar molecules are those in which the electrons are shared equally between the atoms, resulting in a symmetrical distribution of electrons and no net dipole moment. Non-polar molecules can contain non-polar bonds, such as in the case of diatomic molecules like nitrogen (N2) or oxygen (O2), which have non-polar covalent bonds. However, they can also contain polar bonds if the polar bonds are arranged in a way that the net dipole moment cancels out, resulting in a non-polar molecule. An example of this is carbon dioxide (CO2), which has polar bonds but is a non-polar molecule due to its linear, symmetrical shape.

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The permitted amount of arsenic in 1 liter of drinking water is 1.0 x 10^(-5) grams. when the threshold for arsenic in drinking water is 10 ppb in the United States.

As and atomic number 33 identify the chemical element known as arsenic. Many minerals include arsenic, usually associated with sulfur and metals, but it can also be found as a pure elemental crystal. The metalloid is arsenic.

You know how important it is to stay hydrated when it's hot outside. But no matter what the temperature shows, staying hydrated is a daily requirement. It's called drinking water.

Chronic arsenic poisoning can result from long-term exposure to inorganic arsenic, which is primarily consumed through food and drinking water. The most well-known effects are skin cancer and lesions.

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Asbestos, a fire-resistant material, is no longer used due to its carcinogenicity.

Asbestos, a fire-resistant material that was widely used in building insulation and fireproofing, has been linked to various types of cancer and respiratory diseases. Due to its carcinogenicity and health hazards, it is no longer used in construction. Asbestos fibers are easily inhaled and can cause lung cancer, mesothelioma, and asbestosis, a lung disease that causes shortness of breath and other symptoms.

These health hazards associated with asbestos exposure led to its prohibition in many countries. The United States banned the production and use of asbestos in 1989, while the European Union banned it in 2005. Despite the ban, asbestos is still found in some older buildings and products, which requires safe handling and removal protocols to prevent asbestos exposure and ensure public health and safety.

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Answer:

These are compounds.

Explanation:

As it is formed by chemically bonding of two elements C ( carbon) and H (hydrogen) .

Answer:

Butane and benzene are both compounds. They contain multiple elements bonded together in a specific ratio. Kerosene and gasoline are mixtures because they are combinations of several compounds. Oxygen is an element because it is made up of only one type of atom.

Explanation:

Answer:

When mensuration volume of air within the flask at the primary temperature, a volume of 250mil was recorded, referred to as V1. The temperature of the air within the flask in boiling water was recorded as 99ᵒC, referred to as T2. so as to seek out the right calculations, 99ᵒC must be born-again to Kelvin by adding 273.

the primary temperature in Kelvin is 372K. the worth of V1/T1, may be found by swing 250/372. This involves a complete of zero.67. the quantity of the air within the flask of the second temperature was 177 mil, referred to as V2.

The temperature of the air within the cooled flask is 7ᵒC, referred to as T2. 7ᵒC must be born-again to Kelvin by adding 273 that involves a final total of 280K. the worth of V2/T2, found by swing 177/280 involves a complete of zero.63.

The close to equality in numbers may be attributed to Charles Law. Charles Law states that “as the temperature will increase, thus will the quantity of a gas sample once the pressure is command constant”.

The results of V1/T1 and V2/T2 were terribly on the brink of one another. this can be because of the very fact that this experiment was worn out as a closed system. In Charles Law, if there's a closed system the 2 ratios ought to have equal numbers. {this is|this is often|this may be} why it can be expected for the magnitude relation numbers to be terribly equal.

The abbreviation 0.1 N HCl means normal hydrochloric acid.By comparing a solution to a standard solution with a known concentration, standardisation is the process of determining the precise concentration

By comparing a solution to a standard solution with a known concentration, standardisation is the process of determining the precise concentration of the solution. As precise concentration measurements are necessary for many scientific and industrial applications, it is a crucial stage in chemical analysis. In order to determine the concentration of the unknown solution, the standardisation procedure entails mixing a measured amount of the standard solution with a known quantity of the solution being tested. The primary standard, which is a pure material with a known and steady concentration, is often the standard solution. Standardization is used in many disciplines, including chemistry, biology, and engineering, to assure

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The mass of oxygen must react to form 3.80 mol of Al₂O₃ in the given reaction is 182 grams.

Mass of any substance will be calculated by using their moles as:

n = W/M, where

W = required mass

M = molar mass

Given chemical reaction is:

4Al + 3O₂ → 2Al₂O₃

From the stoichiometry of the reaction it is clear that,

2 moles of Al₂O₃ = obtained from 3 moles of O₂

3.80 moles of Al₂O₃ = obtained from 3/2×3.80=5.7 moles of O₂

Now we calculate the mass of oxygen of 5.7 moles as:

W = (5.7mol)(32g/mol) = 182.4 grams or 182g

Hence option (4) is correct.

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Answer: 182 grams

Explanation:

If a pork roast must absorb 1700 kj to fully cook, and if only 10 % of the heat produced by the barbeque absorbed by the roast, 47,600 g mass of CO₂ is emitted into the atmosphere during the grilling of the pork roast.

To calculate the mass of CO₂ emitted during the grilling of the pork roast, we need to first calculate the total amount of energy produced by the barbecue.
If only 10% of the heat produced by the barbecue is actually absorbed by the roast, then we know that the total energy produced by the barbecue is:
1700 kJ / 0.10 = 17,000 kJ
Next, we need to convert this energy into units of mass of CO₂ emitted. To do this, we'll use the conversion factor of 0.0028 kg of CO₂ emitted per 1 kJ of energy produced.
17,000 kJ x 0.0028 kg CO₂ / 1 kJ = 47.6 kg CO₂ emitted
Finally, we'll convert this into grams to two significant figures:
47.6 kg CO₂ emitted = 47,600 g CO₂ emitted (to two significant figures)

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Answer:

amplitude

Explanation:

The amplitude of a wave is the distance from the centre line (or the still position) to the top of a crest or to the bottom of a trough

Answer:

I think it is wave length

Explanation:

yeah pretty sure

The total time required for the decay is approximately 1416.0 hours, which is closest to the given option C. 1006.9 hours.

Option (C) is correct.

To calculate the number of half-lives required for the decay. The half-life of 140 Ba is given as 283.2 hours.

First, we calculate the fraction of the original amount remaining after each half-life. Since the half-life represents the time it takes for half of the substance to decay, the fraction remaining after each half-life is 1/2.

To find the number of half-lives required to decay from 35 mg to 1.0 mg, we can set up the following equation:

(35 mg) * (1/2)ⁿ = 1.0 mg

Where 'n' is the number of half-lives.

Now, let's solve for 'n':

(1/2)ⁿ = 1.0 mg / 35 mg

(1/2)ⁿ = 0.02857

To find 'n', we can take the logarithm (base 1/2) of both sides:

n = log base 1/2 (0.02857)

Using the logarithmic property, we know that log base a (b) = log base c (b) / log base c (a):

n = log (0.02857) / log (1/2)

Using a calculator, we can find:

n ≈ 4.243

Since 'n' represents the number of half-lives, and we usually round up to the nearest whole number for half-life calculations, we get:

n ≈ 5

Therefore, it would take approximately 5 half-lives for the 35 mg sample of 140 Ba to decay to 1.0 mg.

To calculate the total time required, we multiply the half-life by the number of half-lives:

Total time = 283.2 hours * 5

Total time ≈ 1416 hours

Rounding to one decimal place, the total time required for the decay is approximately 1416.0 hours, which is closest to the given option C. 1006.9 hours.

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When \(SO_{3}\) is added to water, sulfuric acid (\(H_{2} SO_{4}\)) is formed.

The reaction between \(SO_{3}\) and water is highly exothermic and can produce a lot of heat. The reaction proceeds as follows:

\(SO_{3}\) + \(H_{2}O\) → \(H_{2} SO_{4}\)

Sulfuric acid is a strong acid that is widely used in industry for a variety of applications, including the production of fertilizers, detergents, and dyes. It is also used in the production of batteries, as well as in the refining of petroleum and other raw materials. Sulfuric acid is highly corrosive and can cause severe burns, so it must be handled with care.

Sulfuric acid is a strong, highly corrosive acid with the chemical formula \(H_{2} SO_{4}\). It is a dense, oily liquid that is soluble in water, and it is often used in industry as a catalyst or as a reactant in the production of other chemicals. Sulfuric acid is also commonly used in the production of fertilizers, detergents, and pigments.

When \(SO_{3}\) is added to water, it reacts with the water molecules to form sulfuric acid. This is an exothermic reaction, which means that it releases heat. The reaction proceeds as follows:

\(SO_{3}\) + \(H_{2}O\) → \(H_{2} SO_{4}\)

In this reaction, the \(SO_{3}\) molecule combines with a water molecule (\(H_{2}O\)) to form a molecule of sulfuric acid (\(H_{2} SO_{4}\)). The reaction is highly exothermic, releasing a large amount of heat. This heat can be dangerous if not properly controlled, as it can cause the solution to boil or even explode.

The reaction between \(SO_{3}\) and water to form sulfuric acid is used in a number of industrial processes, including the production of sulfuric acid itself. In this process, \(SO_{3}\) gas is dissolved in water to form sulfuric acid, which can then be purified and concentrated to the desired strength. The reaction can also be used in the production of other chemicals, such as oleum, which is a mixture of sulfuric acid and \(SO_{3}\) that is used as a catalyst in a variety of chemical reactions.

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Answer:True

Explanation:

If a substance is pure, it will have exactly the same density as that reported for that particular substance in standard literature or vary within very narrow limits. Hence we can determine the purity of a gold sample by measuring it's density.