Write the Lewis structure for the product that forms when boron trifluoride combines with ammonia. Remember to show all non-zero formal charges and all lone pairs of electrons.

Answer: To determine the average atomic mass, we require abundance of every isotope in the nature.

Explanation:

Average atomic mass is defined as the sum of masses of each isotope each multiplied by their natural fractional abundance.

Formula used to calculate average atomic mass follows:

[tex]\text{Average atomic mass }=\sum_{i=1}^n\text{(Atomic mass of an isotopes)}_i\times \text{(Fractional abundance})_i[/tex]

For Example: There are 3 isotopes of silicon, Si-28, Si-29 and Si-30.

We know that:

Average atomic mass of silicon = 28.086 amu

In order to calculate the average atomic mass of an element, we need the atomic mass of every isotope and also the abundance of every isotope in the nature.

Percentage abundance of Si-28 isotope = 92.2 %

Percentage abundance of Si-29 isotope = 4.7 %

Percentage abundance of Si-30 isotope = 3.1 %

Hence, to determine the average atomic mass, we require abundance of every isotope in the nature.

An astronaut in a spaceship. Hence, option B is correct.

A system that does not interact with its surroundings.

To stay physiologically, emotionally and psychologically fit in isolation, astronauts exercise, eat healthily, follow a sleep and work schedule, and make time for leisure activities.

Hence, an astronaut in a spaceship is an isolated system.

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Answer:

The coefficient of Ca(OH)2 is 1

Explanation:

Step 1: unbalanced equation

Ca(OH)2 + HNO3 → Ca(NO3)2 + H2O

Step 2: Balancing the equation

On the right side we have 2x N (in Ca(NO3)2 ) and 1x N on the left side (in HNO3). To balance the amount of N on both sides, we have to multiply HNO3 by 2.

Ca(OH)2 + 2HNO3 → Ca(NO3)2 + H2O

On the left side we have 4x H (2xH in Ca(OH)2 and 2x H in HNO3), on the right side we have 2x H (in H2O). To balance the amount of H on both sides, we have to multiply H2O on the right side, by 2.

Now the equationis balanced.

Ca(OH)2 + 2HNO3 = Ca(NO3)2 + 2H2O

The coefficient of Ca(OH)2 is 1

Final answer:

The coefficient of Ca(OH)2 is 1.

Explanation:

The coefficient of Ca(OH)2 in the equation Ca(OH)2 + HNO3 → Ca(NO3)2 + H2O when balanced using the smallest possible coefficients is 1.

Answer: The concentration of [tex]Cl^-[/tex] ions in the resulting solution is 1.16 M.

Explanation:

To calculate the molarity of the solution after mixing 2 solutions, we use the equation:

[tex]M=\frac{n_1M_1V_1+n_2M_2V_2}{V_1+V_2}[/tex]

where,

[tex]n_1,M_1\text{ and }V_1[/tex] are the n-factor, molarity and volume of the [tex]CaCl_2[/tex]

[tex]n_2,M_2\text{ and }V_2[/tex] are the n-factor, molarity and volume of the [tex]AlCl_3[/tex]

We are given:

[tex]n_1=2\\M_1=0.276M\\V_1=155mL\\n_2=3\\M_2=0.471M\\V_2=384mL[/tex]  

Putting all the values in above equation, we get

[tex]M=\frac{(2\times 0.276\times 155)+(3\times 0.471\times 384)}{155+384}\\\\M=1.16M[/tex]

The concentration of [tex]Cl^-[/tex] ions in the resulting solution will be same as the molarity of solution which is 1.16 M.

Hence, the concentration of [tex]Cl^-[/tex] ions in the resulting solution is 1.16 M.

The molarity of Cl¯ in the solution made by mixing 155 mL of 0.276 M CaCl₂ with 384 mL of 0.471 M AlCl₃ is 1.165 M

We'll begin by calculating the number of mole of chloride ion, Cl¯ in each solution.

Volume = 155 mL = 155 / 1000 = 0.155 L

Molarity = 0.276 M

Mole = Molarity x Volume

Mole of CaCl₂ = 0.276 × 0.155

CaCl₂(aq) —> Ca²⁺(aq) + 2Cl¯(aq)

From the balanced equation above,

1 mole of CaCl₂ contains 2 moles of Cl¯

Therefore,

0.04278 mole of CaCl₂ will contain = 0.04278 × 2 = 0.08556 mole of Cl¯

Thus, 0.08556 mole of Cl¯ is present in 155 mL of 0.276 M of CaCl₂.

Volume = 384 mL = 384 / 1000 = 0.384 L

Molarity = 0.471 M

Mole = Molarity x Volume

Mole of AlCl₃ = 0.471 × 0.384

AlCl₃(aq) —> Al³⁺(aq) + 3Cl¯(aq)

From the balanced equation above,

1 mole of AlCl₃ contains 3 moles of Cl¯

Therefore,

0.180864 mole of AlCl₃ will contain = 0.180864 × 3 = 0.542592 mole of Cl¯

Thus, 0.542592 mole of Cl¯ is present in 384 ml of 0.471 M of AlCl₃

Mole of Cl¯ in CaCl₂ = 0.08556 mole

Mole of Cl¯ in AlCl₃ = 0.542592

Total mole = 0.08556 + 0.542592

Volume of CaCl₂ = 0.155 L

Volume of AlCl₃ = 0.384 L

Total volume = 0.155 + 0.384

Total mole = 0.628152 mole

Total volume = 0.539 L

Molarity = mole / Volume

Molarity of Cl¯ = 0.628152 / 0.539

Therefore, the molarity of Cl¯ in the resulting solution is 1.165 M

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Answer: metabolic acidosis.

Explanation:

Anion Gap(AG) is the difference between positively charged ions and negatively charged ions. It is usually expressed in milliequivalents per litre of millimoles per litres.

Anion Gap is measured or calculated when there is a need to know the cause of metabolic acidosis. To

Anion Gap can be calculated with or without potassium.

(1). With potassium= ([Na^+] + [K^+]) − ([Cl^−] + [HCO^−3]).

From the question; client's lab values are sodium 166 mEq/L, potassium 5.0 mEq/L, chloride 115 mEq/L, and bicarbonate 35 mEq/L.

Slotting in the values, we have;

==>[ (166+5) - (115+35)] mEq/L.

(2). Without potassium:

==> [Na^+] - ([Cl^−] + [HCO^−3]).

==> [(166) - 115 + (35)] mEq/L

Normal Anion gap is 20 mEq/L(Calculating with Potassium) and 8-16 mEq/L (calculating without potassium).

Answer : The density of a sample is, 34.2 g/L

Explanation :

Density : It is defined as the mass contained per unit volume.

Formula used for density :

[tex]Density=\frac{Mass}{Volume}[/tex]

Given :

Mass of a sample = 7.412 grams

Volume =0.217 L

Now put all the given values in the above formula, we get the density of a sample.

[tex]Density=\frac{7.412g}{0.217L}=34.2g/L[/tex]

Therefore, the density of a sample is, 34.2 g/L

Answer:

Below.

Explanation:

The reactions between sodium and chlorine.

2Na + Cj2 ---->  2NaCl.

1 electron from the sodium is transferred to the chlorine atom.

A simple chemical reaction involving the transfer of electrons from a metal to a nonmetal is the formation of sodium chloride from sodium and chlorine gas. This is an oxidation-reduction reaction where sodium is oxidized and chlorine is reduced, leading to the creation of an ionic compound.

An example of a simple chemical reaction that involves the transfer of electrons from a metallic element to a nonmetallic element is the reaction between metallic sodium and chlorine gas to form sodium chloride. This type of reaction is known as an oxidation-reduction or redox reaction. In the reaction, sodium, the metal, donates its electrons to chlorine, the nonmetal, resulting in the formation of sodium ions (Na⁺) and chloride ions (Cl⁻), which together form the ionic compound sodium chloride (NaCl).

The reaction can be represented by the equation:

2 Na (s) + Cl₂ (g) ⇒ 2 NaCl (s)

In this reaction, each sodium atom loses one electron (oxidation) to become a sodium ion, while each chlorine molecule gains two electrons (reduction) to form two chloride ions. The sodium cation (Na⁺) and the chloride anion (Cl⁻) then bond together to create the ionic compound sodium chloride.

Answer:

1. Catalyst

2. Solution

3. Solute

4. Solvent

Explanation:

1. A catalyst increases reaction rate but is not used up or consumed in the reaction

Example of a catalyst found in nature are Enzymes

2. Solution, an homogeneous mixture of two or more substances solutes and solvents

3. Solute, the component of a solution dissolved in the solvent

4. Solvent, the component of a solution that dissolves the solute

Answer:

Rock

Explanation:

Rock -

It refers to the substance composed of minerals which occurs naturally , is referred to as a rock.

Rocks are basically found in the outermost layer of the Earth i.e. , the crust .

There are three major type of rock known, i.e. , sedimentary rocks , metamorphic rocks and igneous rocks .

Hence, from the given information of the question,

The correct answer is rock.

A rock is a solid, naturally occurring, cohesive substance composed of minerals or mineral-like materials. Examples include granite which comprises various minerals. Rocks are classified into three types: igneous, sedimentary, and metamorphic.

A rock is a solid, naturally occurring, cohesive substance composed of minerals or mineral-like materials. For instance, granite is a common form of rock that comprises several minerals including feldspar, mica, and quartz. Rocks can be classified into three main types: igneous, sedimentary, and metamorphic, each type formed under different geological conditions and processes.

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Answer:

103.9 kPa

Explanation:

It's more easy to convert mmHg to Pa and then /1000

Let's try the rule of three:

760 mmHg  is 101325 Pa

780 mmHg (780 mmHg . 101325 Pa) / 760mmHg = 103991.4 Pa

1 kPa = 1000 Pa

103991.4 Pa / 1000 = 103.9 kPa

Answer:

1000N is needed to be applied.

Explanation:

Machines make doing work easier. They allow us use small effort to carry out work on huge amount of load.

The mechanical advantage of a machine;

(M.A) =load/effort

M.A = 0.6

Load =600N

effort =?

0.6 = 600/effort

effort = 600/0.6

effort = 1000N

Answer:c

Explanation:

Answer:

c.

Explanation:

A serial dilution is a dilution that is made fractionated. The stock solution is diluted, then this now solution is diluted, and then successively. The final dilution is the multiplication of the steps dilutions.

The representation of the dilution is v/v (volume per volume) indicates how much of the stock solution is in the total volume of the solution. So 1/5 indicates 1 mL to 5 mL of the solution. If the final volume must be 1 mL, then the stock solution must be 0.2 mL (0.2/1 = 1/5), and the volume of the solvent is 1 mL - 0.2 = 0.8 mL.

The second solution is done with a dilution of 1/10 or 1 mL of the first solution in 10 mL of the total solution. Because the solution has 1 mL, then the volume of the first solution must be 0.1 mL (0.1/1 = 1/10), and the volume of the solvent that must be added is 1 mL - 0.1 mL = 0.9 mL.

Answer:

T° freezing solution → -11.3°C

T° boiling solution → 103.1 °C

Explanation:

Assuming 100 % dissociation, we must find the i, Van't Hoff factor which means "the ions that are dissolved in solution"

This salt dissociates as this:

SnCl₄ (aq)  →   1Sn⁴⁺ (aq)  +   4Cl⁻  (aq)   (so i =5)

The formula for the colligative property of freezing point depression and boiling point elevation are:

ΔT = Kf . m . i

where ΔT = T° freezing pure solvent - T° freezing solution

ΔT = Kb . m . i

where ΔT = T° boiling solution - T° boiling pure solvent

Freezing point depression:

0° - T° freezing solution = 1.86°C/m . 1.22 m . 5

T° freezing solution = - (1.86°C/m . 1.22 m . 5) → -11.3°C

Boiling point elevation:

T° boiling solution - 100°C = 0.512 °C/m . 1.22 m . 5

T° boiling solution = (0.512 °C/m . 1.22 m . 5) + 100°C → 103.1 °C

Answer:

Mass of AgI formed=0.352g

Explanation:

AgNO3 + NaI ----‐>AgI + NaNO3

Volume of AgNO3 =5g/L

Mass of AgNO3 =C×V=0.25g

n(AgNO3)= m/Mr=0.0015mol

For NaI

V= 5g/l

Mass= C×v=0.25g

n=m/Mr=0.0017mol

n=0.0015mol

Mass=n× mr=0.352g

From the stoichiometry of the reaction, 0.45 g of AgI is formed.

First of all we have to obtain the molar concentration of AgNO3 using the formula;

Mass concentration = molar concentration × molar mass

Molar concentration = Mass concentration /molar mass

Molar concentration = 5.00 g/L/170 g/mol = 0.029 M

Number of moles of AgNO3  = molar concentration × volume

=  0.029 M  × 56.6/1000 L= 0.0016 moles

Molar concentration of NaI =  5.00 g/L /150 g/mol = 0.033 M

Number of moles of NaI = 0.033 M  × 56.6/1000 L = 0.0019 moles

The reaction equation is;

AgNO3 + NaI -----> AgI + NaNO3

Since the reaction is 1:1 then AgNO3 is the limiting reactant.

Mass of AgI formed = 0.0016 moles  × 235 g/mol = 0.45 g

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Answer:

Explanation:

Light:

Solar Energy, Storage of Energy, Release of O2, & ATP

Dark:

CO2 Intake, Release of Energy, Release of Water, & Forms Carbohydrates.

Hope this helps!

Final answer:

In photosynthesis, solar energy is utilized during the light phase to produce ATP and release O₂, while the Calvin cycle (dark phase) involves CO₂ intake and the formation of energy-storing carbohydrates.

Explanation:

Photosynthesis consists of two main phases: the light reactions and the Calvin cycle (often referred to as the 'dark' phase). Here is the association of the given elements to each phase:

Light Phase Associations

Dark Phase (Calvin cycle) Associations

These associations help the processes involved in photosynthesis, where light energy is captured to produce ATP and NADPH, and then used along with CO₂ in the Calvin cycle to produce energy-storing carbohydrates, with O₂ released as a by-product.

Answer:

The answer has been provided in the attachment

Explanation:

The step by step explanation is as given in the attachment below.

The dissolution reactions for Mn(ClO4)2 and Li2CO3 are Mn(ClO4)2(s) -> Mn2+(aq) + 2ClO4-(aq) and Li2CO3(s) -> 2Li+(aq) + CO3^2-(aq) respectively. The cations Mn^2+ and Li+ will react with the anions ClO4^- and CO3^2- respectively to form a precipitate. The net precipitation reaction is Mn2+(aq) + 2ClO4-(aq) + 2Li+(aq) + CO3^2-(aq) -> Mn(ClO4)2(s) + Li2CO3(s).

(A) The dissolution reaction for Mn(ClO4)2 is:

Mn(ClO4)2(s)  →  Mn2+(aq) + 2ClO4-(aq)

(B) The dissolution reaction for Li2CO3 is:

Li2CO3(s)  →  2Li+(aq) + CO32-(aq)

(C) Based on the lab results and the solutions, a precipitate will form when the cations Mn2+ and Li+ react with the anions ClO4- and CO32- respectively.

(D) The net precipitation reaction that occurs is:

Mn2+(aq) + 2ClO4-(aq) + 2Li+(aq) + CO32-(aq)  →  Mn(ClO4)2(s) + Li2CO3(s)

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Answer : The diatomic gas is nitrogen gas, N₂.

Explanation :

First we have to calculate the moles of gas.

Using ideal gas equation:

[tex]PV=nRT[/tex]

where,

P = Pressure of gas = 1.00 atm

V = Volume of gas = 4.4 L

n = number of moles of gas = ?

R = Gas constant = [tex]0.0821L.atm/mol.K[/tex]

T = Temperature of gas = [tex]22.0^oC=273+22.0=295.0K[/tex]

Putting values in above equation, we get:

[tex]1.00atm\times 4.4L=n\times (0.0821L.atm/mol.K)\times 295.0K[/tex]

[tex]n=0.1817mol[/tex]

Now we have to calculate the molar mass of gas.

[tex]\text{Molar mass of gas}=\frac{\text{Given mass of gas}}{\text{Moles of gas}}[/tex]

[tex]\text{Molar mass of gas}=\frac{5.1g}{0.1817mol}=28.07g/mol[/tex]

As we are given that the gas is diatomic X₂.

As, 2 atoms of gas X has mass = 28.07 g/mol

So, 1 atom of gas will have mass = [tex]\frac{28.07}{2}=14.04g/mol[/tex]

From this we conclude that the nitrogen atom has mass of 14.04 g/mol.

Thus, the diatomic gas is nitrogen gas, N₂.

Final answer:

Other cation channels, such as voltage-gated calcium and potassium channels, can substitute for the function of blocked voltage-gated sodium channels in action potential generation and propagation.

Explanation:

If the voltage-gated sodium channels are blocked, other cation channels can substitute for their function in action potential generation and propagation. One such cation channel is the voltage-gated calcium channel. Although calcium channels primarily play a role in synaptic transmission, they can also contribute to the depolarization phase of the action potential in the absence of functional sodium channels.

Another cation channel that can substitute for voltage-gated sodium channels is the voltage-gated potassium channel. While potassium channels primarily repolarize the membrane during the action potential, they can also contribute to the depolarization phase in the absence of sodium channels.

It is important to note that these cation channels may not fully replicate the function of voltage-gated sodium channels, and the exact impact on action potential generation and propagation can vary depending on the specific circumstances.

Answer:

C

Explanation:

The charge on an atom depends on the number of protons and electrons present in it. The protons in an atom are positively charged while electrons have a negative charge. For a neutral atom, the number of protons balances the number of electrons. for a negatively charged atom, the number of electrons is more than the number of protons. for a positively charged atom , the number of protons are more than the number of electrons.

An atom must have more protons than electrons in order to have a positive charge.

In order to have a positive charge, an atom must have more protons than electrons.

An atom is electrically neutral when it has the same number of electrons and protons. But if an atom has more protons than electrons, it will have an overall positive charge. For example, a dime has more protons than electrons, so it has a positive charge.

The positive charge of a proton is balanced by the negative charge of an electron. If an atom gains or loses electrons, it becomes an ion with a positive or negative charge.

The '2' in the chemical formula Mg₃(PO₄)₂ indicates that there are two phosphate groups for every three magnesium ions, forming the neutral ionic compound magnesium phosphate.

The chemical formula Mg₃(PO₄)₂ represents the compound magnesium phosphate. In this formula, Mg is the symbol for magnesium, and PO₄ is the polyatomic ion representing a phosphate group. The subscript '2' outside the parentheses indicates that there are two phosphate groups in the compound. When magnesium (Mg) has a 2⁺ charge and pairs with the phosphate ion (PO₄) that carries a 3⁻ charge, balancing the charges requires three magnesium ions to pair with two phosphate groups, resulting in the formula Mg₃(PO₄)₂. This substance is an example of an ionic compound where the constituents have different charges and combine in a ratio to form a neutral compound.

Thus, the '2' in the formula 5Mg₃(PO₄)₂ means that for every three magnesium ions, there are two phosphate ions. The leading '5' suggests that the entire formula is multiplied by five, indicating that there are five units of Mg₃(PO₄)₂ in the expression.

Answer: Option A. oxygen, carbon dioxide, nitrogen

Explanation:

Answer:

The answer to your question is

1.- Volume = 3.4 ml

2.- Volume = 0.61 ml

3.- Mass = 2872.8 pounds

Explanation:

Problem 1

Volume = 18 ml

mass = 35.6 g

density = 10.5 g/ml

Process

1.- Calculate the volume of silver

Formula

[tex]density = \frac{mass}{volume}[/tex]

solve for volume

[tex]volume = \frac{mass}{density}[/tex]

Substitution

[tex]volume = \frac{35.6}{10.5}[/tex]

volume = 3.4 ml

2.- Problem 2

Total volume = ?

Volume = 18 + 3.4

Volume = 21.4 ml

Data

mass = 8.3 g

density = 13.6 g(ml

volume = ?

Formula

[tex]density = \frac{mass}{volume}[/tex]

Solve for volume

[tex]volume = \frac{mass}{density}[/tex]

Substitution

[tex]volume = \frac{8.3}{13.6}[/tex]

Result

volume = 0.61 ml

3.- Problem 3

Data

volume = 345 gal

density = 1 g/ml

mass = ?

Formula

[tex]density = \frac{mass}{volume}[/tex]

Solve for mass

mass = density x volume

Covert gal to ml

                            1 gal --------------- 3785 ml

                         345 gal -------------  x

                            x = (345 x 3785) / 1

                            x = 1305825 ml

Substitution

mass = 1 x 1305825

mass = 1305825 g

Convert g to pounds

                        1 g ------------------- 0.0022 pounds

              1305825 g ----------------   x

                        x = (1305825 x 0.0022)

                        x = 2872.8 pounds

Answer:

Option B

Explanation:

As nitrogen is more electronegative than hydrogen atom, it attracts the electronic cloud towards it center. This results in poles formation that is partial positive charge on hydrogen and partial negative charge on hydrogen atom. Hence, it makes polar polar covalent bond.

The statement which best explain why the bonds in ammonia is polar covalent is " nitrogen has greater electronegativity than hydrogen. Thus option C is correct.

Electronegativity is ability of an atom to attracts bonded pair electrons towards it. The atoms which can acquire stability by accepting one ore more electrons are electronegative.

Nitrogen is an electronegative atom and its valency is 3 means it needs 3 more electron to attain stability. Thus nitrogen is able to attracts the shared electron from hydrogen and forms a partial negative charge.

Hydrogen is an electropositive atom and it forms a partial positive charge by releasing the shared electron towards nitrogen. This charge separation creates there a polarity. That's the bond type is called polar covalent.

Hence, the bond type in ammonia is polar covalent due to the higher electronegativity of nitrogen than hydrogen.

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Answer:

a) 5.9846 mol/kg

b) 5.018 mol/L

c)0.09725

Explanation:

consider 100 g of solution

now

since the salt is 35 % , water will be 65 %

now

mass of salt = 35 g

mass of water = 65 g

we know that

moles = mass / molar mass

so

moles of salt = 35 g / 90 (g/mol) = 0.389 mol

moles of water = 65 / 18 = 3.6111 mol

now

volume of solution = mass of solution / density of solution

volume of solution = 100 g / ( 1.29 g/ml)

volume of solution = 77.52 ml

volume of solution = 0.07752 L

a)molality = moles of salt / mass of water (kg)

molality = 0.389 mol / 0.065 kg

molality = 5.9846 mol/kg

b)

molarity = moles of salt / volume of solution (L)

molarity = 0.389 mol / 0.07752 L

molarity = 5.018 mol/L

c)

now

total moles in the solution = moles of salt + moles of water

total moles in the solution = 0.389 + 3.6111

total moles in the solution = 4 mol

now

mole fraction of salt = moles of salt / total moles

mole fraction of salt = 0.389 mol / 4 mol

mole fraction of salt = 0.09725

The molarity of the solution is 5.018 mol/L and molality of the solution 5.9846 mol/kg.

Assume 100 g of solution the salt concentration- 35 % and water will be 65 %.    

So,  

mass of salt = 35 g  

mass of water = 65 g  

Number of moles,  

[tex]\bold {moles = \dfrac {mass} { molar\ mass}}[/tex]

So,    

moles of salt = 35 g / 90 (g/mol) = 0.389 mole  

moles of water = 65 / 18 = 3.6111 mole  

Volume of solution,

[tex]\bold {volume =\dfrac { mass } {density }}[/tex]  

volume = 100 g / ( 1.29 g/ml)  

volume of solution = 77.52 ml = 0.07752 L  

a)

[tex]\bold {Molality = \dfrac {moles\ of \salt} { mass\ of\ water (kg)}}[/tex]  

molality = 0.389 mol / 0.065 kg  

molality = 5.9846 mol/kg  

b)  

molarity = moles of salt / volume of solution (L)

molarity = 0.389 mol / 0.07752 L  

molarity = 5.018 mol/L  

c)    

 mole fraction of salt = moles of salt / total moles  

mole fraction of salt = 0.389 mol / ( 0.389 + 3.6111)  

mole fraction of salt = 0.09725

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Answer : The concentration of SO₃ in the vessel 0.240 seconds later is, 0.24 M

Explanation :

The expression used for second order kinetics is:

[tex]kt=\frac{1}{[A_t]}-\frac{1}{[A_o]}[/tex]

where,

k = rate constant = [tex]14.1M^{-1}s^{-1}[/tex]

t = time = 0.240 s

[tex][A_t][/tex] = final concentration = ?

[tex][A_o][/tex] = initial concentration = 1.44 M

Now put all the given values in the above expression, we get:

[tex]14.1\times 0.240=\frac{1}{[A_t]}-\frac{1}{1.44}[/tex]

[tex][A_]t=0.24M[/tex]

Therefore, the concentration of SO₃ in the vessel 0.240 seconds later is, 0.24 M

Answer:

3284.3 kg is the mass of HCl needed to produce 5000 kg of CaCl₂

Explanation:

This is the reaction:

CaCO₃ + 2HCl →  CaCl₂  +  CO₂  +  H₂O

Let's convert the mass of the product to moles (mass (g) / molar mas)

Firstly we must convert kg to g

1 kg = 1000 g

5×10³ kg . 1000 g / 1 kg = 5×10⁶ g

5×10⁶ g / 110.98 g/mol = 45053.1 moles

Ratio is 1:2 So, let's make a rule of three:

1 mol of CaCl₂ was produced by the use of 2 moles of HCl

So 45053.1 moles of salt, were produced by, the double of moles

45053.1 mol . 2 → 90106.2 moles

Let's convert the moles, to mass (mol . molar mass)

90106.2 mol . 36.45 g/mol = 3284375 g → 3284.3 kg

Answer:

C) When electrons change levels to produce the Balmer series, the emitted light is in the visible part of the spectrum

Explanation:

The Balmer Series of lines in the hydrogen atom was very important in the history of physics and astronomy. What made it so important?

A) It helped Rutherford explain the workings of the atomic nucleus.

B) Balmer's experiments with these lines helped prove Wien's Law.

C) When electrons change levels to produce the Balmer series, the emitted light is in the visible part of the spectrum.

D) The Balmer series of lines can only be observed from outer space; so the competition to see these lines led to the space race.

E) Mr. Balmer never got the Nobel prize, which made everyone in the field of spectroscopy so angry, they worked extra hard.

the most appropriate will be

C) When electrons change levels to produce the Balmer series, the emitted light is in the visible part of the spectrum

Balmer series of hydrogen lines. These lines are emitted when the electron in the hydrogen atom moves from the orbital n = 3 or greater shell down to the n = 2 shell/orbit. ... Energy is emitted from the atom when the electron leaps from one orbit to another closer to the nucleus.

Wiens law has to do with the radiation  of a black body.

Answer:

The answer to your question is 8.28 g of glucose

Explanation:

Data

Glucose  (C₆H₁₂O₆) = ?

Ethanol (CH₃CH₂OH)

Carbon dioxide (CO₂) = 2.25 l

Pressure = 1 atm

T = 295°K

Reaction

                             C₆H₁₂O₆    ⇒    2C₂H₅OH(l) +2CO₂(g)

- Calculate the number of moles

                             PV = nRT

Solve for n

                             [tex]n = \frac{PV}{RT}[/tex]

Substitution

                             [tex]n = \frac{(1)(2.25)}{(0.082)(295)}[/tex]

Simplification

                            n = 0.092

- Calculate the mass of glucose

                         1 mol of glucose --------------- 2 moles of carbon dioxide

                          x                         --------------- 0.092 moles

                          x = (0.092 x 1) / 2

                          x = 0.046 moles of glucose

Molecular weight of glucose = 180 g

                       180 g of glucose ---------------  1 mol

                         x  g                    ---------------0.046 moles

                         x = (0.046 x 180) / 1

                         x = 8.28 g of glucose                                    

Answer: Beliefs

Explanation: This is a fundamental definition in sociology; the study of society, human social interaction and the rules and processes that bind and separate people not only as individuals, but as members of associations, groups and institutions.

Beliefs are ordinarily defined as the mental acceptance or conviction that certain things are true, real or just the way they are.

Beliefs are a central component of nonmaterial culture, influencing behaviors, values, and norms in a society.

A central component of nonmaterial culture is beliefs, which are the mental acceptance or conviction that certain things are true or real.  These beliefs can vary widely from one culture to another and can shape behaviors, values, and norms within a society. For example, in some cultures, the belief in an afterlife may lead to specific burial rituals, while in other cultures, the belief in a strict diet may shape what foods are considered acceptable or taboo.

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Beliefs are a central component of nonmaterial culture, representing the mental acceptance or conviction that certain things are true or real. They set the foundation for individuals' perception of the world and guide their behaviors.

A central component of nonmaterial culture is beliefs, which are the mental acceptance or conviction that certain things are true or real. Nonmaterial culture refers to the intangible aspects of a society, including its values, norms, and ideologies. These beliefs form the foundation of how individuals perceive and interact with the world, guiding behaviors and influencing societal standards. For example, the belief in equality may cultivate a culture of fairness and non-discrimination in a society.

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The options

Select one:

a. a 3- ion forms.

b. the noble gas configuration of argon is achieved.

c. the result is a configuration of 1s2 2s2 2p6.

d. the atom gains five electrons.

Answer:

c. the result is a configuration of 1s2 2s2 2p6.

Explanation:

Aluminium atom has atomic number of 13 , hence the number of electron is 13 for a neutral atom of aluminium. When aluminium atom reacts with other elements it usually gives out three electron to attain the octet configuration.

The cation representation of aluminium is Al3+ because it has loss three electron to attain the octet rule. Aluminium will be left with 10 electrons after losing 3 of it electrons. The electronic configuration will be represented as follows after losing three electrons;

1S² 2S² 2P∧6 .

At this stage the octet rule has been achieved as it will be represented as

2  8.  The first energy shell now contains two electron and the second energy shell contains 8 electrons.

The configuration of  Neon has been formed in the process.