How many moles of compound are there in the following?
a. 6.60 g (NH4)2SO4
b. . 4.5 kg Ca(OH)2

Answer:

[tex]\boxed{\text{10 mL}}[/tex]

Explanation:

1. Write the balanced chemical equation.

[tex]\text{2NaOH} + \text{H$_{2}$SO$_{4}$} \longrightarrow\ \text{Na$_{2}$SO$_{4}$} + 2\text{H{$_{2}$O}}[/tex]

2. Calculate the moles of NaOH

[tex]\text{Moles of NaOH} =\text{60.0 mL NaOH} \times \dfrac{\text{0.5 mmol NaOH}}{\text{1 mL NaOH}} = \text{30 mmol NaOH}[/tex]

3. Calculate the moles of H₂SO₄.

[tex]\text{Moles of H$_{2}$SO$_{4}$}=\text{30 mmol NaOH} \times \dfrac{\text{1 mmol H$_{2}$SO$_{4}$} }{\text{2 mmol NaOH}} = \text{30 mmol H$_{2}$SO$_{4}$}[/tex]

4. Calculate the volume of H₂SO₄

[tex]c = \text{30 mmol H$_{2}$SO$_{4}$} \times \dfrac{\text{1 mL H$_{2}$SO$_{4}$}}{\text{3.0 mmol H$_{2}$SO$_{4}$}} = \text{10 mL H$_{2}$SO$_{4}$}[/tex]

The titration will require [tex]\textbf{10 mL}[/tex] H₂SO₄.

Answer:

activity involving mental or physical effort done in order to achieve a purpose or result.

Explanation:

The scientific definition of work is: using a force to move an object a distance .

Answer:

Explanation:

Beryllium especially, but Boron as well both exhibit metallic characteristics.

The outside ring of Beryllium contains 2 electrons. It would have to take on 6 electrons to have a ring of 8. The same statement can be made about Boron (except that it would need 5 electrons to make 8). It is easier for the atom to give up 2 or 3 than than to take on 5 or 6. It would not be easy to have a 5 or 6 minus charge on it.

Boron and beryllium are exceptions to the octet rule because they have less than eight electrons in their valence shell in some compounds, such as BF₃ and BeH₂, due to their position in Group III and the unique properties of their electrons.

Boron and beryllium are exceptions to the octet rule because they do not always complete an octet of electrons in their compounds. Boron, found in compounds like BF₃, tends to form compounds with only six valence electrons around the boron atom, rather than the eight suggested by the octet rule. Beryllium, on the other hand, often ends up with only four valence electrons as seen in the molecule BeH₂. These deviations from the octet rule occur because of the elements' positions in Group III of the periodic table, where elements commonly have fewer valence electrons than required to fulfill the octet. Thus, compounds of these elements are less predictable from the octet rule, which was primarily based on observations of the elements in Groups IV through VIII.

Incomplete octets are found in some compounds involving boron, aluminum, and beryllium, such as boron hydrides. The behavior of these elements is based on their tendency to form stable structures with fewer than eight electrons; boron atoms, for example, might follow a 'sextet rule' in some compounds but can achieve full octets in others like in its complex with ammonia, NH₃BF₃. Likewise, beryllium typically forms molecular compounds wherein it forms single covalent bonds without reaching an octet, due to its limited number of valence electrons and its small atomic size.

Answer:

It is A. Because charged particles of solar wind ignite different gases in Earth's atmosphere.

Explanation:

Since the solar wind from the sun is too radioactive for humans (they would die), once the charged particles hit the earth's atmosphere it shows its color. Every element has its own color and once it hits the atmosphere it really starts to show.

Because charged particles of solar wind ignite different gases in Earth's atmosphere is the correct statement.

The northern lights, also known as the auroras, are a natural phenomenon that occurs when charged particles from the Sun's solar wind interact with the Earth's magnetosphere and atmosphere. The solar wind consists of charged particles, mainly electrons and protons, that are ejected from the Sun's outer atmosphere.

As these charged particles enter the Earth's magnetosphere, they follow the planet's magnetic field lines and are funneled toward the polar regions. When they reach the Earth's atmosphere, they collide with atoms and molecules, particularly those of oxygen and nitrogen.

These collisions excite the atoms and molecules, causing them to release energy in the form of light. The specific colors observed in the auroras depend on the type of gas present in the atmosphere and the altitude at which the collisions occur. Oxygen atoms emit green and red light, while nitrogen atoms produce blue and purple light.

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Answer:

Immoral means not moral and connotes evil or licentious behavior. Amoral, nonmoral, and unmoral, virtually synonymous although the first is by far the most common form, mean utterly lacking in morals (either good or bad), neither moral nor immoral.

so I would say no

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Answer:

C. Pulverizing the zinc metal into a fine powder

Explanation:

Answer: C. Pulverizing the zinc metal into a fine powder

Explanation:

Answer:

1.0 x 10⁻¹².

Explanation:

Cu₂S(s) ⇌ 2Cu⁺(aq) + S²⁻(aq),

The equilibrium constant (Keq) = [Cu⁺]²[S²⁻]/[Cu₂S].

[Cu⁺] = 1.0 × 10⁻⁵ M, [S²⁻] = 1.0 × 10⁻² M.

[Cu₂S] = 1.0, since the concentration of solid is always can be considered = 1.0.

∴ Keq = [Cu⁺][S²⁻]/[Cu₂S] = (1.0 × 10⁻⁵)²(1.0 × 10⁻²)/(1.0) = 1.0 x 10⁻¹².

Answer: The equilibrium constant for the above reaction is [tex]1.0\times 10^{-12}[/tex]

Explanation:

Equilibrium constant in terms of concentration is defined as the ratio of concentration of products to the concentration of reactants each raised to the power their stoichiometric ratios. It is expressed as [tex]K_{c}[/tex]

For a general chemical reaction:

[tex]aA+bB\rightarrow cC+dD[/tex]

The expression for [tex]K_{c}[/tex] is written as:

[tex]K_{c}=\frac{[C]^c[D]^d}{[A]^a[B]^b}[/tex]

Concentration of solid and liquid substances in a chemical reaction is taken to be 1.

For the given chemical reaction:

[tex]Cu_2S(s)\rightarrow 2Cu^+(aq.)+S^{2-}(aq.)[/tex]

The expression for [tex]K_{c}[/tex] is written follows:

[tex]K_c=[Cu^+]^2\times [S^{2-}][/tex]

We are given:

[tex][Cu^+]=1.0\times 10^{-5}M[/tex]

[tex][S^{2-}]=1.0\times 10^{-2}M[/tex]

Putting values in above expression, we get:

[tex]K_c=(1.0\times 10^{-5})^2\times (1.0\times 10^{-2})\\\\K_c=1.0\times 10^{-12}[/tex]

Hence, the equilibrium constant for the above reaction is [tex]1.0\times 10^{-12}[/tex]

Answer:

N₂O₄ + 14 kcal ⇄ 2NO₂.

Explanation:

Since the sign of ΔH determines either the reaction is exothermic or endothermic:

+ve, the reaction is endothermic.

-ve, the reaction is exothermic.

∵ The change of enthalpy of this reaction when proceeding left to right is + 14 kcal (+ ve sign).

∴ The reaction is endothermic, the heat is a part of the reacatnts in the reaction.

So, the reaction is:

N₂O₄ + 14 kcal ⇄ 2NO₂.

Answer:

B. The number of complete electron shells stays the same.

Explanation:

The periods on a periodic table consists of those elements that are arranged in the horizontal row in the periodic table.

Elements in the same period have the same number of electron shells and this corresponds to the period. This implies that elements of period 2 have two electron shells, those of period 3 have three shells and so on.

The number of Valence electrons of the elements on the same period increases progressively by one across the period from left to right.

A group is the vertical column to which elements are arranged on the periodic table. Elements in the same group have the same number of Valence electrons and the number of shell increases down a group.

When we go down a period, the number of shell stays the same.

Question 1:

1. One form of niobium oxide crystallizes in the unit cell shown above.

A. How many niobium atoms per unit cell? 3

B. How many oxygen atoms per unit cell? 3

C. What is the formula of niobium oxide? Nb2O5

Answer: A) 3 B) 3 C) Nb205

Question 2:

2. Quartz (left) and glass (right) are both forms of silicon dioxide. A piece of quartz breaks into a collection of smaller regular crystals with smooth faces. A piece of glass breaks into irregular shards. Use molecular structures to explain why the two solids break so differently. Select all that apply.

1. the bonding and geometry in quartz shows regular repeating patterns *

2.  the bonding and geometry in quartz shows irregular repeating patterns

3. the bonding and geometry in glass shows irregular repeating patterns *

4. the atomic geometries of the two solids can explain why they break so differently  *

5. the atomic geometries of the two solids cannot explain why they break so differently

6. the bonding and geometry in glass shows regular repeating patterns

Answer: 1,3,4

3. Solid silver adopts a face-centered cubic lattice. The metallic radius of a silver atom is 144 pm.

a. How many silver atoms occupy one unit cell of solid silver? 4

b. Calculate the length (in pm) of one side of the unit cell. 407

c. Calculate the volume (in m3) of one the unit cell.  6.74 x10^-29

d. What percentage (expressed to four significant figures) of the volume is empty? 25.95

Answer: a)4 b)407  c)6.74 x10^-29   d)25.95

4. Why hexane is insoluble in water? Select all that apply.

1. Water is polar solvent. *

2. Polar solvents dissolve both polar and non-polar compounds.

3. Polar solvents dissolve only polar compounds. *

4. Solubility does not depends on the polarity of the solvents and reagents.

5. Hexane is non-polar compound. *

Answer: 1,3,5

<3 goodluck

Final answer:

The empirical formula for the niobium oxide with oxide ions at the middle of each edge and niobium atoms at the center of each face is Nb2O, obtained by counting the ions per unit cell and adjusting for their location in the structure.

Explanation:

To determine the empirical formula of the niobium oxide, first, we need to consider how many ions are associated with each other in the cubic unit cell structure. A cubic unit cell with oxide ions at the middle of each edge and niobium atoms at the center of each face can be described as follows: each edge has 1/4 of an oxide ion since it is shared by 4 cubes, resulting in 1 oxide ion per unit cell (there are 12 edges, thus 12 x 1/4 = 3, but each oxygen is set twice, thus 3 / 2 = 1.5 but oxygen only gives 1 charge so we only take half). Each face-centered niobium contributes 1/2 of an atom to the unit cell since each face is shared between two unit cells, leading to 3 niobium atoms per unit cell (6 faces x 1/2 = 3). Therefore, for every 1 niobium atom, there is 0.5 of an oxide ion, and by multiplying both the niobium and oxide amounts by 2 to get whole numbers, we obtain the empirical formula Nb2O.

The coordination number of an ion in a crystalline structure is the number of counterions that surround it. In the niobium oxide unit cell described, the oxide ions are at the midpoint of each edge, and niobium atoms are at the center of each face. Without additional information, however, it is not possible to determine the exact coordination number, as this would depend on the 3D arrangement of the atoms within the cell.

Answer:

This definitely is important:

Explanation:

Because if the police, FBI, etc., find something else about the case where the man has already been tried for the entire case, otherwise known as the same crime, and not convicted, there is literally nothing that any of them can do because the government would be looked at as not working fast enough. BUT it is also important simply because of the fact that if you are someone who has been tried for the crime, and you weren't actually the one who did it or even simply witnessed it, they can't try you for that same crime even if they find a small smidge as to how you are involved, or if you even witnessed or HEARD it happening. Police sometimes try to convict the person who heard the crime happening simply because they don't know what else to do, or even to try to get the case closed to work on something else, because if you heard the crime happening, then it's counted as involvement in the investigation and the police could also think that it means that you're also involved in the crime itself, but don't have any other evidence as to why or how you could be the criminal in the investigation. It does happen, even if certain or lots of simply random people admit or not.

The double jeopardy clause in the Fifth Amendment is important for several reasons.

The double jeopardy clause in the Fifth Amendment is significant for a few reasons.

First, it stops the government from bothering and punishing people. If the government could try someone again for a crime they were already found not guilty of, it could use its power to overpower the defendant and make it hard for them to have a fair trial.

The double jeopardy clause keeps people from having to go through the emotional and psychological pain of being tried for the same crime more than once. Going through a trial can be very stressful, and being put on trial more than once for the same crime can be really tough.

The double jeopardy clause helps make sure that once someone has been tried and convicted for a crime, they can't be tried and convicted again for the same crime. When someone is found not guilty of a crime, they should be allowed to continue with their life without worrying about facing another trial.

In simple words, the double jeopardy clause helps protect people's rights and keeps the criminal justice system fair. It makes sure that people are not bothered or harmed by the government, and that they don't have to go through the emotional and mental stress of facing many trials for the same crime.

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2.5 x 10^24 molecules of C4H10

Answer: Im pretty sure n=1 as thats the first one indicated.

Explanation:

Answer:

n=1

Explanation:

Answer:

B. they are unsaturated

Explanation:

Alkanes are long chain hydrocarbons with only single bonds, alkenes are hydrocarbons with at least one double bond and alkynes are hydrocarbons with at least one triple bond.

Alkanes, alkenes and alkynes are all hydrocarbons. Therefore statement D. is incorrect

Hydrocarbons are compounds containing carbon and hydrogen only

Neither of the three are aromatic compounds therefore statement A is incorrect

Saturated hydrocarbons are where all the bonds between atoms are single bonds. Unsaturated hydrocarbonds are when at least there's one double or triple bond.

Alkanes are saturated and Alkynes and alkenes are unsaturated.

therefore statement B is correct where alkenes and alkynes are unsaturated but alkanes are not

Final answer:

Alkenes and alkynes are unsaturated hydrocarbons due to the presence of carbon-carbon double and triple bonds, respectively, differentiating them from saturated alkanes.

Explanation:

The correct answer to the question is B: Alkenes and alkynes are unsaturated hydrocarbons. This is because they contain double or triple carbon-carbon bonds respectively, which means they have fewer hydrogen atoms attached to the carbon backbone compared to alkanes, which contain only single bonds and are therefore saturated. The term saturated indicates that a molecule contains the maximum possible number of hydrogen atoms whereas unsaturated indicates the presence of double or triple bonds, which replace some hydrogen atoms.

Aromatic compounds, like benzene, are indeed hydrocarbons but they are classified by their distinct ring structure with delocalized electrons, which is not a characteristic of alkenes or alkynes. Alkenes and alkynes are not aromatic simply because they have unsaturated bonds. Alkanes are also hydrocarbons; however, they are saturated, which is a term not applicable to alkenes or alkynes.

Answer:

Endothermic proceses

Exothermic proceses

Explanation:

By definition an exothermic processes are those in which the system releases energy to the enviroment, while endothermic processes are those in which the system absorbs energy from the environment.

That change in energy is generally measured as heat.

Then an exothermic process releases heat and and endothermic process absorbs heat.

From that, as a first consequence, in an exothermic process the final substances (products in the case of a chemical reaction) ends with lower energy and lower temperature than the initial substances (reactants in the case of a chemical reaction).

The heat content of the substances is usually measured as enthalpy, then, for a chemical reaction you can write th is equation for the enthalpy change:

Thus, for an exothermic reaction ΔH products  < ΔH reactants ⇒ ΔH < 0, whilced for an endothermic reaction ΔH products > ΔH reactants ⇒ ΔH > 0.

The difference in energy between the products and the reactants is a result of the chemical potential energy of the substances, which is the energy stored in the chemical bonds. Then, in an endothermic reaction more energy is needed to break the chemical bonds of the reactants than what is released from the formation of the chemical bonds of the products. Of course the opposite is true: in an exothermic reaction, energy is released because it is required less energy for the formation of the new bonds of the products than what is needed to break the bonds of the reactants.

Answer:

Explanation:

        2 H₂O (l) ⇄ H₃O⁺ + OH⁺

        Kw = [H₃O⁺ ] [ OH⁺]

Answer:

where's the question... ?

Answer:

TRUE

Explanation:

Answer : The enthalpy change for this reaction is -193.8 kJ.

Solution :

The balanced chemical reaction is,

[tex]2SO_2(g)+O_2(g)\rightarrow 2SO_3(g)[/tex]

The expression for enthalpy change is,

[tex]\Delta H=\sum [n\times \Delta H_f(product)]-\sum [n\times \Delta H_f(reactant)][/tex]

[tex]\Delta H=[(n_{SO_3}\times \Delta H_{SO_3})]-[(n_{O_2}\times \Delta H_{O_2})+(n_{SO_2}\times \Delta H_{SO_2})][/tex]

where,

n = number of moles

[tex]\Delta H_{O_2}=0[/tex] (as heat of formation of substances in their standard state is zero

Now put all the given values in this expression, we get

[tex]\Delta H=[(2\times -395.7)]-[(1\times 0)+(2\times -298.8)][/tex]

[tex]Delta H=-193.8kJ[/tex]

Therefore, the enthalpy change for this reaction is, -193.8 KJ

Final answer:

The heat of reaction for the formation of sulfur trioxide from sulfur dioxide and oxygen, using the provided enthalpies of formation, is calculated to be -193.8 kJ.

Explanation:

The student has asked what the heat of reaction is when sulfur dioxide reacts with oxygen to form sulfur trioxide. The given balanced chemical equation is 2SO2(g) + O2(g) → 2SO3(g). The standard enthalpy of formation (ΔHf0) for SO2 is −298.8 kJ/mol, and for SO3 it's −395.7 kJ/mol.

Calculating the Heat of Reaction

To find the heat of reaction, we use the following formula:

ΔH = [∑ (ΔHf0 products)] - [∑ (ΔHf0 reactants)]

ΔH = [2 mol × (−395.7 kJ/mol SO3)] - [2 mol × (−298.8 kJ/mol SO2) + 1 mol × (0 kJ/mol O2)]

ΔH = [−2 × 395.7 kJ] - [−2 × 298.8 kJ]

ΔH = (−791.4 kJ) - (−597.6 kJ)

ΔH = −193.8 kJ

Therefore, the heat of reaction for the formation of sulfur trioxide from sulfur dioxide and oxygen is −193.8 kJ.

Answer:

c.)long chain of carbon molecules

Explanation:

Answer:

Heterogenous mixture is a mixture that has different properties throughout.

Explanation:

Mixture refers to substances that are not chemically mixed together, that is, they can easily be separated by physical methods. There are two major types of mixture; these are heterogeneous and homogeneous mixtures. Homogeneous mixtures refer to those mixtures that are uniform in composition. A good example of this is tap water. Heterogeneous mixture on the other hand refers to those mixtures, which are not uniform in composition. A good example of this is a mixture of water and sand.  

Answer:

[tex]\boxed{\text{KNO}_{3}}[/tex]

Explanation:

The reaction is

KOH(aq) + HNO₃(aq) ⟶ KNO₃(aq) + H₂O(ℓ)

If you evaporate the water, the solid substance is the compound, potassium nitrate.

[tex]\boxed{\textbf{KNO}_{3}}[/tex]

KNO₃(aq) ⟶ KNO₃(s)

Answer:

In an endothermic reaction, the products are at a higher energy level than are the reactants.

Explanation:

ΔH = E products - E reactants.

So, for endothermic reactions, the products are at a higher energy level than are the reactants.

Kindly see the attached image.

Answer:

[tex]\boxed{\text{2 mol/L}}[/tex]

Step-by-step explanation:

[tex]c = \dfrac{ \text{moles} }{ \text{litres}}\\\\c = \dfrac{n }{V }[/tex]

Data:

n = 5 mol

V = 2.5 L

Calculation:

[tex]c = \dfrac{ \text{5 mol} }{\text{2.5 L}} = \text{2 mol/L}[/tex]

The molar concentration of the solution is [tex]\boxed{\textbf{2 mol/L}}[/tex].

The velocity for the forward reaction equal that of the reverse reaction.

Answer: - the velocity for the forward reaction equal that of the reverse reaction

Explanation:-

Equilibrium constant is defined as the ratio of concentration of product to the concentration of reactants each raised to the power their stoichiometric ratios. It is represented by the symbol 'K'. For the general equilibrium equation:

[tex]aA+bB\rightleftharpoons cC+dD[/tex]

The expression for equilibrium constant is given as:

[tex]K=\frac{[C]^c[D]^d}{[A]^a[B]^b}[/tex]

Characteristics of equilibrium reaction:

Chemical equilibrium are attained is closed system.

The macroscopic remains constant like: volume, pressure, energy etc.

Rate of forward reaction is equal to the rate of backward reaction. The concentration of the reactants and products remain constant.They are not always equal.

Answer:

well its D Mg + 2HCl ----- MgCl2 + H2

Explanation:

Because Magnesium Replaces Hydrogen

Americium is an element named for a country in the Western Hemisphere

The element named after a location in the Western Hemisphere is Tennessine (Ts), named after Tennessee. Naming elements after locations or scientists is customary in chemistry, pending approval by IUPAC.

The element named after a country in the Western Hemisphere is Tennessine, with the symbol Ts. Element 117, Tennessine, was proposed by a team of scientists from Russia and the United States, named after the state of Tennessee. Naming elements after locations, particularly cities, regions, or countries is one of the traditions followed in the scientific community, as seen when a Russian research team named element 118 Oganesson, symbol Og, after the scientist Yuri Oganessian, who made significant contributions to the discovery of heavy elements.

Traditionally, it is typical for the discoverers of a new element to propose a name, which is then subject to approval by the International Union of Pure and Applied Chemistry (IUPAC) before it becomes official. Before getting their final names, elements may carry temporary systematic names based on Latin numbers corresponding to their atomic numbers.

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Answer:

B. 92.4 g

Explanation:

the balanced equation for the reaction is as follows

CaCO₃ + 2HCl ---> CaCl₂ + CO₂ + H₂O

molar ratio of CaCO₃ to CaCl₂ is 1:1

number of CaCO₃ moles reacted - 104 g / 100 g/mol = 1.04 mol

therefore number of CaCl₂ moles reacted - 1.04 mol

mass of CaCl₂ expected to be formed = 1.04 mol x 111 g/mol = 115.44 g

percentage yield = actual yield / theoretical yield x 100 %

theoretical yield = 115.44 g

percentage yield = 80.15 %

substituting these values in the above equation

80.15 % = actual yield / 115.44 g x 100 %

actual yield = 92.5 g

therefore answer is B. 92.4 g

Answer:

Explanation:

Ionic compounds are formed by the electrostatic attraction of cations and anions.

Cations, positive ions, are formed when atoms lose electrons, and anions, negative ions, are formed when atoms gain electrons.

When two different atoms have similar atraction for electrons (electronegativity) they will not donate to nor catch electrons from each other, so cations and anions will not be formed. Instead, the atoms would prefer to share electrons forming covalent bonds to complete their outermost shell (octet rule).

Then, in order to form ionic compounds the electronegativities have to substantially different. This situation does not happen between two nonmetal elements, which nitrogen and sulfur are. Then, you can predict safely that nitrogen and sulfur will not form an ionic compound.

Ionic compounds, then require the electronegativity difference that exist between some metals and nonmetals. Being magnesium an alkaline earth metal, its electronegativity is very low. On the other hand, fluorine the first element of the group 17, has the highest electronegativity of all the elements.Thus magnesium and fluorine will have enough electronegativity difference to justify the exchange of electrons, forming ions and, consequently, ionic compounds.

Magnesium and Fluorine are the elements most likely to form an ionic compound.

The pair of elements most likely to form an ionic compound is Magnesium and Fluorine.

Binary ionic compounds are composed of a metal (cation) and a nonmetal (anion). Magnesium is a metal and has a low ionization potential, meaning it easily loses electrons. Fluorine is a nonmetal and has a high electron affinity, meaning it readily gains electrons. These properties make it highly likely for magnesium and fluorine to form an ionic compound, such as magnesium fluoride (MgF2).

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Explanation:

Hi!

Let's solve this!

Metamorphism is a process that involves rocks. This process occurs when they are subjected to a lot of pressure or temperatures.

This process also happens in the presence of fluids. There are different types of metamorphism such as dynamic, hydrothermal, shock, and others.