1.What does it mean for an acid or base to be strong?

The electron geometry  of HCN is linear geometry and molecular geometry of the carbon in HCN  is linear geometry.

The lewis structure is as follows :

H - C ≡ N :

The number of the the valence electrons = 10 electrons

The carbon is the central atom. The HCN is the AX2 type of the molecule. The A is the central atom. X is the central atom. This type of the molecule has the linear electron geometry. There is no lone in the central atom, therefore the molecular geometry of the HCN is linear geometry.

Thus the both electron and the molecular geometry is linear.

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Answer:

crest

Explanation:

I hope the attached answer of image helps you.

By Benjemin

Answer:

pH = 12.90

Explanation:

THe reaction of HNO₃ with KOH is:

HNO₂ + KOH → KNO₂ + H₂O

That means 1 mole of nitrous acid reacts per mole of potassium hydroxide.

To solve this question, we need to find the moles of each reactant:

Moles HNO₂:

0.0179L * (0.458mol / L) = 0.00820 moles

Moles KOH:

0.0334L * (0.368mol / L) = 0.01229 moles

That means KOH is in excess. The moles in excess are:

0.01229 moles - 0.00820 moles = 0.00409 moles KOH = Moles OH⁻

The [OH⁻] is -Total volume = 17.9mL+33.4mL = 51.3mL = 0.0513L-:

0.00409 moles / 0.0513L =

0.0797M =[OH⁻]

pOH = -log[OH⁻] = 1.098

pH = 14 - pOH

Answer:

C) one magnesium and one oxygen

Option C and D are correct.

Electron affinity is dfined as the energy required to remove en electron from a gaseous atom or molecule. An example of a gaseous atom loosing an electron is given as:

From the reaction, you can see that the gaseous element X looses an electron from its outershell to form an ion. This reaction is known as the first electron affinity.

Hence the correct statement dealing with electron affinity are:

• It is the enthalpy change associated with the, removal of an electron, from a gaseous atom or ion.

• In general the, first electron affinity, is:, X(g) + e- → X-(g)

Answer:

A. It is exothermic

Explanation:

This reaction of acid and base represents synthesis reaction because new subsatnces are produced.

Synthesis reactions are reactions that occur when two different atoms combines to form a different molecule. A synthesis reaction can be represented by the equation i.e. A + B → C. In this equation, the A and B represent the reactants whereas the C represents the product.

So we can conclude that option C is the correct answer which is the synthesis reaction.

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The value in mile is 8.35 * 10^12 miles.

It is often important to be able to convert values from one unit to another. This has always helped to make mathematical and physical computations much easier.

The conversion factor is often used to convert from one unit to another. It serves as bridge that would enable us to be able to convert quantities. The conversion factor has to be dimensionally correct.

Let us now convert  1.42 light-years to miles;

1.42 light years *  3.00 × 108 m/1 s * 1 mi/1609 m * 3600 s/1 hr * 24 hrs/1 day  * 365 days/1 year

= 8.35 * 10^12 miles

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The oxidation number of Ag in Ag2O is +1.

In Ag2O, there are two silver atoms (Ag) and one oxygen atom (O). Oxygen is known to have an oxidation number of -2 in most compounds. Since the compound is neutral, the sum of the oxidation numbers of all the atoms must equal zero.

Therefore, the oxidation numbers of the two silver atoms must add up to +2 to balance out the -2 oxidation number of the oxygen atom. Since there are two silver atoms, each silver atom must have an oxidation number of +1 to yield a total oxidation number of +2 for the compound.

In Ag2O, the silver atoms lose one electron each to form Ag+ ions. This results in an oxidation number of +1 for each silver atom. The oxygen atom gains two electrons from the silver atoms to achieve a stable octet configuration, resulting in an oxidation number of -2 for the oxygen atom. The compound Ag2O is formed through the transfer of electrons, with each silver atom exhibiting an oxidation number of +1.

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population is the number of species living in a given area if this is regarding biology or earth studies :)

Answer:

=> 0.12428 M

Explanation:

To begin, write down a balanced equation;

Ca(HCO3)2 + 2HNO3 => Ca(NO3)2 + 2H2O + 2CO2

Then calculate the number of moles contained in 9.56 mL of 1.30M HNO3

We know that molarity is contained in 1000mL

1000 mL = 1.30 moles

9.56 mL = ?

= (9.56 × 1.30)/1000

= 0.012428 moles

Mole ratio

Ca(HCO3)2 : HNO3

1 : 2

But, xmoles : 0.012428 moles

x = 1/2 × 0.012428

= 0.006214 moles

This moles is contained in 50 mL solution.

50 mL = 0.006214 moles

1000 mL = ?

= (1000 × 0.006214)/50

= 0.12428M

Answer:

f=ma

40=m*8

m=5kg

another object of same mass is added

=>m=5+5=10kg

f=10*8=80N

Explanation:

Answer:

= 14.63 × \(10^{45}\) particles.

Explanation:

According to Avogadro's priciple:

1 mole of any substance is 6.02 × \(10^{23}\) particles

∴ 2.43 x \(10^{24}\) moles × 6.02 × \(10^{23}\)

= 14.63 × \(10^{45}\) particles.

I hope this was clear and easy to understand.

There are 3.44 x 10^{22} particles in 0.057 moles of lithium bromide.

The lithium bromide formula also known as the lithium monobromide formula or Bromo lithium formula is explored. It is a counterion bromide-based salt of lithium.

we have to use Avogadro's constant,

Avogadro's constant, is approximately equal to 6.022 x 10^{22} particles per mole.

we can use the following formula:

number of particles = moles x Avogadro's constant

Substitute the values,

number of particles = 0.057 moles x 6.022 x 10^{23} particles/mol

Simplifying the equation

number of particles = 3.44 x 10^{22} particles

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(a) The balanced chemical equation of magnesium and dilute sulfuric acid is Mg + H₂SO₄ → MgSO₄ + H₂.

(b) The solution was filtered to remove the solid magnesium sulphate (MgSO₄) produced.

The balanced chemical equation of magnesium and dilute sulfuric acid is given as;

Mg + H₂SO₄ → MgSO₄ + H₂.

During the reaction the fizzing that was observed was due to the production of hydrogen gas.

At the end of the reaction, magnesium sulphate (MgSO₄) will be formed, as well as hydrogen gas.

The magnesium sulphate (MgSO₄) formed is a solid, and filtration can be used to remove the solid  magnesium sulphate (MgSO₄) formed.

Filtration is a separation technique used to separate a mixture of liquid and solid, so it will be the best separation technique to recover the produced  magnesium sulphate (MgSO₄).

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Answer:

Extent of reaction = 95.9 mol.

Fractional conversion of the limiting reactant = 0.846.

Percentage by which the other reactant is in excess = 25.2 %.

Explanation:

Hello.

In this case, for the undergoing chemical reaction:

\(CH_2=CH_2+HBr\rightarrow CH_3-CH_2Br\)

We can write the mole balance per species also including the extent of the reaction:

\(CH_2=CH_2:A\\\\HBr: B\\\\CH_3-CH_2-Br:C\)

\(x_AP=z_AF-\epsilon \\\\x_BP=z_BF-\epsilon \\\\x_CP=\epsilon\)

Considering that P is the flow of the outlet product. In such a way, writing the data we know, we can write:

\(0.33P=z_A*265-\epsilon \\\\0.103P=z_B*265-\epsilon \\\\0.567P=\epsilon\)

Whereas we can replace the C2H5Br mole balance in the others mole balances:

\(0.33P=z_A*265-0.567P \\\\0.103P=z_B*265-0.567P\\\\\\z_A*265-0.897P=0\\\\z_B*265-0.67P=0\)

By knowing that \(z_B=1-z_A\), we can write:

\(z_A*265-0.897P=0\\\\(1-z_A)*265-0.67P=0\\\\\\z_A*265-0.897P=0\\\\-z_A*265-0.67P=-265\)

Thus, solving for P and \(z_A\), we obtain:

\(z_A=0.572\\\\P=169.11mol\)

It means that the extent of the reaction is:

\(\epsilon=0.567P=0.567*169.11mol\\\\\epsilon=95.9mol\)

For the limiting reactant, due to the 1:1 mole ratio between the reactants, it is the one having the smallest flow rate:

\(F_A=0.572*265mol=151.58mol\\\\F_B=265mol-151.58mol=113.42mol\)

It means that the limiting reactant is B which is HBr, whose fractional conversion is:

\(X_B=1-\frac{0.103*169.11}{113.42mol}\\ \\X_B=0.846\)

Finally, the percentage by which the other reactant is in excess, corresponds to:

\(\% excess =(1-\frac{113.42mol}{151.58mol})*100\%\\ \\\%excess=25.2\%\)

Regards.

Answer: 31.9 g of KOH can be produced from 22.2 g of KOH

Explanation:

To calculate the moles :

\(\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}\)    

\(\text{Moles of} K=\frac{22.2g}{39g/mol}=0.57moles\)  

\(2K+2H_2O\rightarrow 2KOH+H_2\)  

According to stoichiometry :

2 moles of \(K\) produce = 2 moles of \(KOH\)

Thus 0.57 moles of \(K\) will produce=\(\frac{2}{2}\times 0.57=0.57moles\)  of \(KOH\)

Mass of \(KOH=moles\times {\text {Molar mass}}=0.57moles\times 56g/mol=31.9g\)

Thus 31.9 g of KOH can be produced from 22.2 g of KOH

The two main postulates that was given by Antoine Lavoisier are, oxygen play an important role in combustion and the other is mass of the reactant and product is conserved. Therefore, the given statement is incorrect.

According to Law of conservation of mass, mass can neither be created nor be destroyed. Mass can only be transformed from one form to another. The law of conservation of mass was given by Antoine Lavoisier.

Every reaction in nature follow the law given by Antoine Lavoisier that is mass is always conserved. To see law of conservation, we need to check only number of atoms not the splitting of atoms or element. So, the given statement is incorrect.

Therefore, the given statement is incorrect.

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The balanced chemical equation for the decomposition of aspirin (acetylsalicylic acid) is:

\(2C_{9}H_{8}O_{4} (aspirin) → 2C_{7}H_{6}O_{3} (salicylic acid) + 2CO_{2} (Carbon dioxide) + H_{2}O (water)\)

In this reaction, the aspirin molecule breaks down into salicylic acid, carbon dioxide, and water. The reaction is typically catalyzed by heat or exposure to acidic or basic conditions.

Aspirin, or acetylsalicylic acid, contains ester functional groups that can undergo hydrolysis. Under suitable conditions, the ester bond in aspirin is cleaved, leading to the formation of salicylic acid, which is the primary decomposition product. Additionally, carbon dioxide and water are released as byproducts of the reaction.

The balanced equation shows that for every two molecules of aspirin, two molecules of salicylic acid, two molecules of carbon dioxide, and one molecule of water are formed. Understanding the decomposition of aspirin is important in pharmaceutical and chemical industries to ensure the stability and shelf-life of the compound, as well as to study its breakdown products and potential side reactions.

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The final value for the enthalpy change of the formation of CO2 and 2H2O from their elements (C, H2, and O2) would be -1410 kJ per mole of CO2 and 2 moles of H2O formed.

The enthalpy change (ΔH) for the reaction CO2 + 2H2O → H2CO3 can be calculated by multiplying the stoichiometric coefficients of the balanced equation by the enthalpy values of the corresponding compounds involved in the reaction.

In the given reaction, the enthalpy change is -1410 kJ. However, it's important to note that this enthalpy change corresponds to a specific reaction and may not directly apply to the formation of CO2 and 2H2O from another reaction or process.

If we assume that the reaction is the formation of one mole of CO2 and two moles of H2O, we can say that the enthalpy change for this specific formation reaction is -1410 kJ.

Therefore, the final value for the enthalpy change of the formation of CO2 and 2H2O from their elements (C, H2, and O2) would be -1410 kJ per mole of CO2 and 2 moles of H2O formed.

It's worth mentioning that the enthalpy change can vary depending on the specific conditions (temperature, pressure, etc.) and the reactants involved in the reaction. Therefore, it's crucial to specify the conditions and reaction context when referring to enthalpy values.

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The concentration of the specie is obtained as  0.79 M.

We know that a buffer is a solution that is resistant to changes in acidity and alkalinity. Now, we know that we have the following information;

pH = 10.00

Concentration of base = 0.18 M

Kb = 4.4 x 10 -4

Hence;

pOH = 14 - 10.00 = 4

pKb = -log( 4.4 x 10 -4)  3.36

Using the formula;

pOH = pKb + log [A-/AH]

4 = 3.36 + log[A-/0.18]

4 - 3.36 = log[A-/0.18]

Antilog(4 - 3.36) = [A-/0.18]

A- = Antilog(4 - 3.36) * 0.18

A- = 0.79 M

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The electrons move from left to right through the circle labeled "M" to reach the cathode, where reduction takes place.

If oxidation occurs on the left side of the fuel cell and reduction occurs on the right side, the movement of electrons can be described as follows: Electrons move from left to right through the circle labeled "M."

In a fuel cell, the process of oxidation takes place at the anode (labeled A) where the fuel is oxidized, releasing electrons. These electrons then flow through the external electrical circuit, represented by the wire connecting objects A and B. The electrons reach the cathode (also labeled A) on the right side of the cell, where reduction occurs.The circle labeled "M" represents the membrane or electrolyte in the fuel cell. This membrane allows the transport of ions but blocks the movement of electrons. As a result, electrons cannot flow directly through the electrolyte but must travel through the external circuit.

This movement of electrons through the external circuit is what generates an electric current that can be used to power electrical devices or systems.

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Answer:

Fatty foods become rancid due to the process of rancidity

Answer: A

Explanation:

Answer:

B

Explanation:

BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB I LIKE B it's B though gl on the rest.

Answer:d

Explanation:took the test

The arrow in the statement  is likely pointing to the atomic symbol of manganese, which is the letter "Mn."  Therefore, option (D) is correct.

In the periodic table, elements are organized based on their atomic number, which corresponds to the number of protons in the nucleus of an atom. Manganese has an atomic number of 25, indicating that it has 25 protons. The atomic symbol is a shorthand representation of the element's name, allowing for easy identification and reference.

Therefore, the arrow is pointing to the atomic symbol of manganese, "Mn," indicating its position in the periodic table and distinguishing it from other elements. The atomic symbol is a fundamental component of the periodic table, enabling scientists to communicate and study elements and their properties more efficiently.

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Gaseous acetylene reacts with oxygen gas to form gaseous carbon dioxide and gaseous water. The chemical equation of the reaction is \(2C_2H_2 (g) + 5O_2 (g)-- > 4CO_2 (g) + 2H_2O (g)\)

The chemical equation of a reaction is an expression that shows how the reactants combine to form the products using the chemical symbols for the components.

The reaction of gaseous acetylene with oxygen gas to form gaseous carbon dioxide and gaseous water can be analyzed and written as follows:

The chemical formula for gaseous acetylene = \(C_2H_2 (g)\)

The chemical formula for oxygen gas = \(O_2 (g)\)

The chemical formula for gaseous carbon dioxide = \(CO_2 (g)\)

The chemical formula for gaseous water = \(H_2O (g)\)

The overall equation for the chemical reaction with all the phases identified is then written as:

\(2C_2H_2 (g) + 5O_2 (g)-- > 4CO_2 (g) + 2H_2O (g)\)

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Gaseous acetylene (C2H2) reacts with oxygen gas to form gaseous carbon dioxide and gaseous water.

Express your answer as a chemical equation. Identify all of the phases in your answer.

Answer:

CaCl3 is the limited reagent

Explanation:

Answer:

C

Explanation:

Answer:

I think is A

Explanation:

Hope it helps

Answer:

Br-CH2-CH(CH3)2-C(Cl)H-CH(CH3)2-CHO

Explanation:

The molecule has a total of 14 carbon atoms, 13 hydrogen atoms, and 1 bromine atom. The carbon atoms are arranged in a chain with a methyl group attached to the second carbon atom, a chlorine atom attached to the third carbon atom, and two methyl groups attached to the fourth carbon atom. The fifth carbon atom has a carbonyl group attached to it.

The molecule is an aldehyde, which means that it has a carbonyl group (C=O) at the end of the chain. The carbonyl group is polar, and the oxygen atom has a partial negative charge. The hydrogen atom has a partial positive charge. This polarity makes the aldehyde group susceptible to nucleophilic attack.

The bromine and chlorine atoms are both electrophilic, which means that they have a partial positive charge. This makes them susceptible to nucleophilic attack.

The methyl groups are non-polar and do not have any significant reactivity.

The molecule is a chiral molecule, which means that it has a mirror image that is not superimposable on itself. This is because the carbon atom with the carbonyl group is attached to four different groups.

The molecule is a liquid at room temperature and has a strong odor. It is used in a variety of products, including perfumes, flavorings, and plastics.