The central atom's number of valence electrons in __________ makes it an exception to the octet rule. nh3 sef2 bf3 asf3 cf4

Answer:

Part A: 6HClO₄(aq) + Fe₂O₃(s) → 2Fe(ClO₄)₃(aq) + 3H₂O(l).

Part B: H₂SO₄(aq) + Sr(s) → SrSO₄(s) + H₂(g).

Part C: H₃PO₄(aq) + 3KOH(aq) → K₃PO₄(aq) + 3H₂O(l).

Explanation:

Part A: complete HClO₄(aq) + Fe₂O₃(s)→ Express your answer as a balanced chemical equation. Identify all of the phases in your answer.

6HClO₄(aq) + Fe₂O₃(s) → 2Fe(ClO₄)₃(aq) + 3H₂O(l).

It is clear that 6 mol of HClO₄ (in aqueous phase) react with 1 mol of Fe₂O₃ (in solid phase) to produce 2 mol of Fe(ClO₄)₃ (in aqueous phase) and 3 mol of H₂O (in liquid phase).

Part B: H₂SO₄(aq) + Sr(s) → Express your answer as a balanced chemical equation. Identify all of the phases in your answer.

H₂SO₄(aq) + Sr(s) → SrSO₄(s) + H₂(g).

It is clear that 1 mol of H₂SO₄ (in aqueous phase) reacts with 1 mol of Sr (in solid phase) to produce 1 mol of SrSO₄ (in solid phase) and 1 mol of H₂ (in gas phase).

Part C: H₃PO₄(aq) + KOH(aq) → Express your answer as a balanced chemical equation.

H₃PO₄(aq) + 3KOH(aq) → K₃PO₄(aq) + 3H₂O(l).

It is clear that 1 mol of H₃PO₄ (in aqueous phase) react with 3 mol of KOH (in aqueous phase) to produce 1 mol of K₃PO₄ (in aqueous phase) and 3 mol of H₂O (in liquid phase).

Answer:

0.7589 mol/L ≅ 0.76 mol/L.

Explanation:

N₂(g) + 3H₂(g) ⇄ 2NH₃(g),

Kc = [NH₃]²/[N₂][H₂]³

Kc = 6.0 x 10⁻²,

[N₂] = (7.2 mol)/(6.0 L) = 1.2 mol/L, [H₂] = (12.0 mol)/(6.0 L) = 2.0 mol/L.

∴ [NH₃]² = (Kc)[N₂][H₂]³ = (6.0 x 10⁻²)(1.2 mol/L)(2.0 mol/L)³ = 0.576.

∴ [NH₃] = √(0.576) = 0.7589 mol/L ≅ 0.76 mol/L.

Answer:

Explanation:

A buffer solution is an aqueous solution consisting of a mixture of a weak acid and its conjugate base, or weak base and its conjugate acid.

Also, a buffer solution is a solution which resists changes in pH when acid or alkali is added to it.

So the right choice is

A combination of 0.1 mol NaH2PO4 and 0.1 mol Na2HPO4 would produce a buffer solution.

A buffer solution is a solution that resists changes in pH when small amounts of acid or base are added. To form a buffer solution, we need a weak acid and its conjugate base (or a weak base and its conjugate acid) in roughly equal amounts.

Out of the given options, the combination of 0.1 mol NaH2PO4 and 0.1 mol Na2HPO4 would produce a buffer solution. NaH2PO4 is a weak acid and Na2HPO4 is its conjugate base. Together, they can maintain the pH of the solution.

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Answer:

metals as they have free electrons

Answer:

The answer is metals

Explanation:

Metals, for example mercury (Hg), iron (Fe) and copper (Cu), have metallic bonds. In this kind of bond the electrons are deslocalized. That means that electrons moves from one atom to another, by forming a "sea of electrons". Several properties of metals, such as electrical and thermal conductivity, are explained by this model of chemical bond.

Answer:

first one: how much is reflected

Reason? google search :)

Answer:

How much energy is reflected from earth back into space

Explanation:

This energy exchange is known as space-atmosphere-earth energy balance. To explain it, we will give the short-wave incident solar radiation that reaches our atmosphere a value of 100 units.

Stratospheric ozone absorbs and in turn emits 3 units; Water vapor, carbon dioxide and clouds produce an absorption of 18 units. The clouds, in turn, reflect radiation into space worth 24 units, and the rest of atmospheric particles reflect another 7.

The energy that reaches the ground, either directly or indirectly, is 47 units; Of which, the different components of the earth's surface reflect an average of 4.

The surface of the Earth transforms solar energy into long-wave radiation - heating - which, when emitted into space, at a temperature of 15 degrees Celsius, would correspond to 114 units; Of which, 109 are absorbed by water vapor, carbon dioxide and clouds, thus heating the lower atmospheric layers.

Answer:

A. When temperature increases, the number and energy of collisions between particles increases, which increases the rate of the reaction.

Explanation:

The reaction rate measures the speed with which a reaction proceeds. Based on the collision theory of reaction rates, the rate of a given reaction depends on the number of collisions per time and how successful or effective the collisions are.

Reaction rate in view of the collision theory is very related to concentration and temperature. Both properties are directly proportional to the rate of a reaction.

As temperature increase, the rate of the reaction increases due to the number of effective collisions and the energy of between colliding particles.

The relationship between the temperature and the reaction should be option A.

The reaction rate represents the speed. Depend on the collision theory of reaction rates, the rate of a given reaction based on the number of collisions per time. Since temperature increase, the rate of the reaction increases because of the number of effective collisions.

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Answer:

Mg.

Explanation:

Mg + 1/2O₂ → MgO.

Mg is oxidized to Mg²⁺ in (MgO) (loses 2 electrons). "reducing agent".

O is reduced to O²⁻ in (MgO) (gains 2 electrons). "oxidizing agent".

The answers are in the photo.

Answer:

Explanation:

1) Data:

a) m = 20. g

b) ΔT = 35°C - 25°C

c) Cs = 0.13 J / g°C

2)  Formula:

3) Solution:

The answer shows two significant figures.

The energy absorbed as heat by 20.0 g of gold when it is heated from 25ºC to 35ºC is 26.0 joules.

To find the amount of energy absorbed as heat by a substance, we can use the formula:

[tex]\[ Q = m \cdot c \cdot \Delta T \][/tex]

where:

- Q is the heat energy absorbed (in joules),

- m is the mass of the substance (in grams),

- c is the specific heat capacity of the substance (in joules per gram per degree Celsius),

- [tex]\( \Delta T \)[/tex] is the change in temperature (in degrees Celsius).

 Given:

- The mass of gold, m = 20.0  g,

- The specific heat capacity of gold, c = 0.13  J/g·ºC,

- The change in temperature,[tex]\( \Delta T[/tex] = 35ºC - 25ºC = 10ºC .

 Plugging these values into the formula, we get:

[tex]\[ Q = 20.0 \text{ g} \cdot 0.13 \text{ J/g.C} \cdot 10.C \] \[ Q = 20.0 \cdot 0.13 \cdot 10 \] \[ Q = 26.0 \text{ J} \][/tex]

Therefore, the energy absorbed as heat = 26.0 joules.

Answer: The strongest inter particle force in [tex]MgCl_2[/tex] is electrostatic force of attraction.

Explanation:

Magnesium chloride is an ionic compound which is formed by the combination of magnesium ions and chloride ions.

Ionic compounds are defined as the compounds which are formed by the complete transfer of electrons from one atom to another atom.

In these compounds, oppositely charged ions are attracted towards each other to form a compound.

The attraction between oppositely charged species is very strong and is known as electrostatic force of attraction.

Hence, the strongest inter particle force in [tex]MgCl_2[/tex] is electrostatic force of attraction.

Answer:

Explanation:

The reaction between propane and oxygen is a combustion process for an hydrocarbon.

The formula of propane is given as C₃H₈ and oxygen is written as O₂

For this combustion reaction, the general equation is given as:

    Cₓ[tex]H_{y}[/tex] + (x + [tex]\frac{y}{4}[/tex])O₂ → xCO₂ + [tex]\frac{y}{2}[/tex]H₂O

In the reaction between propane and oxygen,

x = 3

y = 8

The reaction is then written as:

          C₃H₈ + (3 +[tex]\frac{8}{4}[/tex])O₂ → 3CO₂ + [tex]\frac{8}{2}[/tex]H₂O

C₃H₈ + 5O₂ → 3CO₂ + 4H₂O

Answer:

[tex]\huge \boxed{\mathrm{C_3 H_8 +5O_2 \Rightarrow 3CO_2 +4 H_2 O}}[/tex]

[tex]\rule[225]{225}{2}[/tex]

Explanation:

[tex]\sf C_3 H_8 +O_2 \Rightarrow CO_2 + H_2 O[/tex]

Balancing Carbon atoms on the right side,

[tex]\sf C_3 H_8 +O_2 \Rightarrow 3CO_2 + H_2 O[/tex]

Balancing Hydrogen atoms on the right side,

[tex]\sf C_3 H_8 +O_2 \Rightarrow 3CO_2 +4 H_2 O[/tex]

Balancing Oxygen atoms on the left side,

[tex]\sf C_3 H_8 +5O_2 \Rightarrow 3CO_2 +4 H_2 O[/tex]

[tex]\rule[225]{225}{2}[/tex]

Answer:

[tex]\boxed{\text{B.}}[/tex]

Explanation:

B.

[tex]\rm C$_7$H_{16}$ + 11O$_2$ $\longrightarrow \,$ 7CO$_2$ + 8H$_2$O[/tex]

BALANCED. 7C, 16H, and 22O on each side of equation.

A.

[tex]\rm C$_7$H$_{16}$ + 5O$_2$ $\longrightarrow \,\rm 6CO$_2$ + 4H$_2$O[/tex]

NOT BALANCED. 7C on left and 6C on right.

C.

[tex]\rm C$_7$H$_{16}$ + 14O$_2$ $\longrightarrow \,$ 7CO$_2$ + 5H$_2$O[/tex]

NOT BALANCED. 16H on left and 10H on right.

D.

[tex]\rm C$_7$H$_{16}$ + 22O$_2$ $\longrightarrow \, $ 14CO$_2$ + 16H$_2$O[/tex]

NOT BALANCED. 7C on left and 14C on right.

the answer is in the picture

Answer: 2HCL (aq) + ZN(s) ZnCl2(s) = H2(g)

Explanation:

Answer:

Explanation:

1) Since the average kinetic energy of a gas is only dependent on its temperature, you conclude that, at the same temperature of 70°C, the average kinetic energy of He atoms is the same that the average kinetic energy of NH₃ molecules: 7.1 × 10⁻²¹ J / molecule.

2) Now, you can use the equation that relates the average kinetic energy with the mean-square speed:

Where:

You need to use the atomic mass of helium to find the mass (average) of one atom of helum:

        m = 4.003 g/ mol / (6.022 × 10²³ atoms/mol)

        m = 6.647 × 10⁻²⁴ g = 6.647 10 ⁻²⁷ kg / atom

3) Solve for v², substitute, and compute:

Note: since He is a monoatomic molecule, kg/atom = kg/molecule.

            = 2.14 × 10⁶ m²/s² ← answer

Photosynthesis will produce oxygen gas that will be taken up by humans for respiration. Respiration will produce carbon dioxide that will be taken up by plants for photosynthesis. So both waste products will be recycled and reused so therefore an example of zero waste world

Answer:

On the one hand the human being when breathing consume oxygen and returns carbon dioxide to the environment, which for human respiration would be waste, instead the absorbent plant said carbon dioxide to transform it into nutrients through photosynthesis and as a danger releases oxygen, the which as we said before is used by the human being in his breathing. This concludes a sustainability cycle with zero waste.

Explanation:

Photosynthesis is a process that develops in two stages:

Light reactions: it is a light-dependent process (clear stage), it requires light energy to manufacture ATP and NADPH reduced energy carrier molecules, to be used in the second stage.

Calvin-Benson cycle: it is the independent stage of light (dark stage), the products of the first stage plus CO2 are used to form the C-C bonds of carbohydrates. Dark stage reactions usually occur in the dark if energy transporters from the light stage are present. Recent evidence suggests that the most important enzyme of the dark stage is indirectly stimulated by light, if so the term would not be correct to call it "dark stage". The light stage occurs in the grana and the dark one in the stroma of the chloroplasts.

Human breathing

In breathing, a vital process for life, the oxygen from the inhaled air enters the blood, and carbon dioxide - a waste gas from the metabolism of nutrients - is exhaled into the atmosphere.

The exchange of these gases takes place when the air reaches the pulmonary alveoli. These small sacs are surrounded by blood capillaries. The air diffuses through these cells to reach the interior of the blood capillaries, which transport oxygen-rich air to the heart to be distributed throughout the body. At the same time, in the alveoli the gaseous carbon dioxide diffuses from the blood into the lung and is exhaled.

Answer:

The answer is...

Explanation:

Smaller crystals have more surface area.

Answer: B.22.4 liters

Explanation:

When we attribute to a certain fixed mass of a given gas a fixed number of molecules. Avogadro considered that the mass of 36g of oxygen at any temperature and pressure would have a fixed number of molecules to which he called 1 mol of molecules. So by definition 1 mole of molecules would have a number of molecules equal to that present in 36 g of oxygen. The occupied volume by one mole of molecules at a given temperature and pressure is called molar volume and consists in 22,4 Liters. The molar volume matches the Avogadro Hypothesis (created in 1811 by Amedeo Avogadro), where equal volumes of different gases, at the same temperature and pressure, have even number of moles.

At standard temperature and pressure (STP), 1 mole of any gas will occupy a volume of 22.4 liters. This is a universal truth for all ideal gases.

The volume of 1 mole of any gas at standard temperature and pressure (STP) is defined by Avogadro's law. According to this law, the volume of 1 mole of gas at STP is 22.4 liters. Therefore, the correct answer to your question is B. 22.4 liters. This applies to all ideal gases, assuming that temperature is 0°C and pressure is 1 atmosphere.

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Answer:

g. H₂SO₄ + Ca(OH)₂ → CaSO₄ + 2H₂O.

Explanation:

Sulfuric acid is represented as H₂SO₄ and calcium hydroxide is represented as Ca(OH)₂.

g. H₂SO₄ + Ca(OH)₂ → CaSO₄ + 2H₂O.

f. H₂SO₄ + 2Ca(OH)₂ → 2CaSO₄ + 3H₂O

is not correct that the no. of S, and O is not equal in both reaction sides.

S in reactants (1) while in products (2).

O in reactants (8) while in products (11).

h. HSO₄ + CaOH → CaSO₄ + H₂O

The reactants is represented in a wrong way.

j. H₂SO₄+ Ca(OH)₂ → CaSO₄ + H₂O

is not correct that the no. of H and O is not equal in both reaction sides.

H in reactants (4) while in products (2).

O in reactants (6) while in products (5).

So, the right choice is: g. H₂SO₄ + Ca(OH)₂ → CaSO₄ + 2H₂O.

The correct balanced equation for the reaction between sulfuric acid  and calcium hydroxide is: H₂SO₄ + 2Ca(OH)₂ → CaSO₄ + 2H₂O

This equation represents a neutralization reaction between an acid (sulfuric acid) and a base (calcium hydroxide). In this reaction, sulfuric acid reacts with calcium hydroxide to produce calcium sulfate and water.

The stoichiometric coefficients in front of each compound indicate the balanced ratio of reactants and products.

According to the equation, for every 1 molecule of sulfuric acid, 2 molecules of calcium hydroxide. This is because sulfuric acid is a diacid, meaning it can donate two hydrogen ions (H+) per molecule.

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Answer : Verbal and non-verbal communication wad used by Investigators in the past when trying to determine if someone was lying.

Explanation: In the Verbal communication information is transferred from one person to other by speaking.

Non-verbal communication includes Facial expressions , eye contact , body language, eyes blinking etc.

If someone is lying he or she will easily dermined by applying above things.

Answer:

[tex]\boxed{\text{(E) }1.0 \times 10^{-3} \text{ mol/L and pH = 3}}[/tex]

Explanation:

1. Calculate the concentration of hydronium ion

We can use an ICE table to organize the calculations.

                      HA + H₂O ⇌ H₃O⁺ + A⁻

I/mol·L⁻¹:     0.100                  0        0

C/mol·L⁻¹:       -x                    +x      +x

E/mol·L⁻¹:   0.100 - x              x         x

[tex]K_{\text{a}} = \dfrac{\text{[H}_{3}\text{O}^{+}]\text{A}^{-}]} {\text{[HA]}} = 1.0 \times 10^{-5}\\\\\dfrac{x^{2}}{0.100 - x} = 1.0 \times 10^{-5}\\\\\\\text{Check for negligibility of }x\\\\\dfrac{ 0.100 }{1.0 \times 10^{-5}} = 10 000 > 400\\\\\therefore x \ll 0.100\\\\\\x^{2} = 0.100 \times 1.0\times 10^{-5} = 1.00 \times 10^{-6}\\\\x = \sqrt{1.00 \times 10^{-6}} = 1.0\times 10^{-3}\\\\\rm [H$_{3}$O$^{+}$]= x mol$\cdot$L$^{-1}$ = 1.0 $\times$ 10$^{-3}$ mol$\cdot$L$^{-1}$[/tex]

2. Calculate the pH

[tex]\text{pH} = -\log{\rm[H_{3}O^{+}]} = -\log{1.0 \times 10^{-3}} = \boxed{\mathbf{3}}[/tex]

Answer:

Explanation:

Since, for ideal gases the temperature is in direct relation to the volume and the pressure, you can predict that if the volume is doubled and the pressure is tripled the effect on the temperature will be 3 × 2 = 6 times.

You can prove it using the combined law of gases:

Where the letters P denote absolute pressures, the letters T denote temperature measured in absolute scale, and the letters V denote volume.

The changes given may be written it this way:

Then, you can write T₂ in terms of the other variables:

Cancel the common factors P₁ and V₁

Which proves that the final temperature is 6 times the initial temperature.

By tripling the pressure and doubling the volume, the gas temperature changes by a factor of 6 according to the combined gas law.

To determine by what factor the gas temperature changes if the volume is doubled and the pressure is tripled, we can use the combined gas law, which is a combination of Boyle's, Charles's, and Gay-Lussac's laws. The combined gas law states that for a given amount of gas, the ratio of the product of pressure (P) and volume (V) to the temperature (T) is constant, or:

(P₁ * V₁) / T₁ = (P₂ * V₂) / T₂

Assuming the initial conditions are P₁, V₁, and T₁, and after the changes they are P₂ = 3 * P₁, V₂ = 2 * V₁, and T₂, we can rearrange the equation to solve for T2/T1:

(3 * P₁ * 2 * V₁) / T₂ = (P₁ * V₁) / T₁

(6 * P₁ * V₁) / T₂ =  (P₁ * V₁)/ T₁

T₂ / T₁ = 6 * (P₁ * V₁) / (P₁ * V₁)

T₂ / T₁ = 6

So by tripling the pressure and doubling the volume, the temperature of the gas increases by a factor of 6. This result agrees with our understanding of the behavior of gases when subjected to changes in temperature, volume, and pressure.

Answer:

At-207 (meaning At with the number on the top left being 207 and the number at the bottom left being 85.

Explanation:

The sum of the mass numbers has to equal on both sides, so we need 211 = 4+a

a=207

The sum of the atomic numbers as to equal on both sides, so 87=2+b

b=85

The element is determined by the mass number.

Answer:

C. Spectrum of colors emitted by gas

Explanation:

Neils Bohr model of atom suggested that orbital electrons are divided into spherical orbits or energy levels around the central nucleus. In essence, electrons are located at various energy levels round the nucleus. His concept explained the discrete lines in the atomic spectrum of hydrogen. He suggested that electrons can move between different energy levels by simply gaining or losing energy.

The spectrum of colors emitted by a gas provides the evidence for Bohr's theory of atomic orbitals. This is because the spectral patterns match very well with Bohr's predictions of quantized energy levels for electrons.

The evidence that supports Bohr's theory of atomic orbitals comes from the spectrum of colors emitted by a gas when it is excited by heat or electrical charge. This is because Bohr's theory states that electrons live in distinct energy levels, or orbitals, and can absorb energy and 'jump' to a higher energy level. When they fall back down to their original level, they emit energy in the form of light (photons).

The discrete, or quantized, energy levels predicted by Bohr result in the emission of light in very specific wavelengths, creating a unique spectral pattern for each element. Such spectral patterns observed in the lab match very well with Bohr's predictions, providing strong evidence to support his theory.

Options A, B, and D refer to experiments and models that did contribute to the development of atomic theory, but aren't specifically tied to Bohr's model of the atom. For example, the gold foil experiment carried out by Rutherford was important for discovering the nuclear nature of atoms, but doesn't provide evidence for the existence of atomic orbitals.

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Answer:

[tex]\boxed{\text{25. 20 L; 26. 49 K}}[/tex]

Explanation:

25. Boyle's Law

The temperature and amount of gas are constant, so we can use Boyle’s Law.

[tex]p_{1}V_{1} = p_{2}V_{2}[/tex]

Data:

[tex]\begin{array}{rcrrcl}p_{1}& =& \text{100 kPa}\qquad & V_{1} &= & \text{10.00 L} \\p_{2}& =& \text{50 kPa}\qquad & V_{2} &= & ?\\\end{array}[/tex]

Calculations:

[tex]\begin{array}{rcl}100 \times 10.00 & =& 50V_{2}\\1000 & = & 50V_{2}\\V_{2} & = &\textbf{20 L}\\\end{array}\\\text{The new volume will be } \boxed{\textbf{20 L}}[/tex]

26. Ideal Gas Law

We have p, V and n, so we can use the Ideal Gas Law to calculate the volume.

pV = nRT

Data:  

p = 101.3 kPa

V = 20 L

n = 5 mol

R = 8.314 kPa·L·K⁻¹mol⁻¹

Calculation:

101.3 × 20 = 5 ×  8.314 × T

2026 = 41.57T

[tex]T = \dfrac{2026}{41.57} = \textbf{49 K}\\\\\text{The Kelvin temperature is }\boxed{\textbf{49 K}}[/tex]

Answer:

Explanation:

1.The color of the powder of a mineral.

                      Answer 1 : Streak

Streak is the color displayed by a mineral in powdered form. The streak of some minerals differs from their original color.

2.The sinking of one lithospheric plate beneath another.

                     Answer 2 : Subduction

At a convergent margin, a denser lithospheric plate falls beneath the lighter one in a process called subduction. This region is called the subduction zone.

3.A process that includes both the disintegration and decomposition of surface rock material.

                    Answer 3: Weathering

Weathering is defined as the physical disintegration and chemical decomposition of rocks to form soils and sediments on the earth surface.

4.The chemical altering of the composition of the material.

                    Answer 4: Chemical weathering  

It is the decomposition or altering of earth materials chemically.

5. How much matter is in a certain amount of space; mass divided by volume.

                     Answer 5 : Density

Density is defined as the mass per unit volume.

6. The physical or mechanical breakdown of Earth's materials.

                     Answer 6: Physical weathering

Physical weathering is the disintegration of earth materials using mechanical means.

7. Movement of Earth's materials by glacial action.

                         Answer 7: Glacial erosion

This is the wearing and washing away of earth's materials by action of moving glaciers.

8. The ability of a mineral to resist scratching.

                        Answer 8: Hardness

Hardness is expressed in an ability to resist deformation and any from of abrasion

9. A type of igneous rock that forms inside the Earth.

                       Answer 9: Plutonic or intrusive igneous rocks

Igneous rocks that forms within the crust are called plutonic or intrusive igneous rocks.

10. The rock formed by the cooling and solidifying of molten rock.

                     Answer 10: Igneous rocks

Igneous rocks are rocks that formed from cooling and solidifying of molten rocks

The color of the powder of a mineral is called streak. Subduction is the sinking of one lithospheric plate beneath another. Weathering is the process that includes both the disintegration and decomposition of surface rock material.

The color of the powder of a mineral is called the streak.

The sinking of one lithospheric plate beneath another is called subduction.

The process that includes both the disintegration and decomposition of surface rock material is called weathering.

The chemical altering of the composition of a material is called chemical weathering.

The amount of matter in a certain amount of space is called density, which is determined by dividing mass by volume.

The physical or mechanical breakdown of Earth's materials is called mechanical weathering.

The movement of Earth's materials by glacial action is called glacial erosion.

The ability of a mineral to resist scratching is called hardness.

A type of igneous rock that forms inside the Earth is called intrusive igneous rock.

The rock that forms from the cooling and solidifying of molten rock is called igneous rock.

Answer:

The pH of this solution is 3.4.

Explanation:

Consider the definition of the pH of a solution:

[tex]\displaystyle \rm pH = \log{\frac{1}{[H_{3}O^{+}]}} = - \log{[H_3O}^{+}]}[/tex],

where

The unit "M" here is the same as moles per liter.

On a scientific calculator, evaluate

[tex]\rm -\log{(3.8\times 10^{-4})}[/tex]

to find the pH of this solution.

[tex]\rm pH = -\log{(3.8\times 10^{-4})} \approx 3.4[/tex].

The pH of this solution is approximately 3.4.

Answer:

0.875 time.

Explanation:

The length of plastic water bottles are bought in the United States every day = (the no. of plastic water bottles are bought every day)(length of each bottle) = (140.0 million bottle)(0.25 m) = 35.0 million meter.

The length of the equator of the earth = 40.0 million meter.

∴ The times can the Earth's equator be circled by a line of plastic bottles used in the United States every day = (The length of plastic water bottles are bought in the United States every day)/(The length of the equator of the earth) = (35.0 million meter)/(40.0 million meter) = 0.875 times.

Answer:

Caffeine would require a non-polar solvent to dissolve it

Explanation:

The general rule of solubility is that "like dissolves like". Polar solvents would dissolve polar solutes and non-polar solvents would dissolve non-polar solute.

Water is a polar solvent and would readily dissolve polar compounds such as the range of ionic/electrovalent compound like NaCl and polar covalent compounds.

For non-polar solutes, compounds like dichloromethane would readily dissolve them. Both caffeine and this solvent are both organic compound and would interact readily with one another. Although this compound is slightly polar, it would readily dissolve caffeine

Partial polar nature of Caffeine make it more soluble in less polar solvent such as dichloromethane as compared to water.

Caffeine is partially polar and we know that water is more polar solvent than dichloromethane which causes caffeine more soluble in dichloromethane compared to water so we can conclude that partial polar nature of Caffeine make it more soluble in less polar solvent such as dichloromethane as compared to water.

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Answer:

1.86 moles

Explanation:

The equation you need to use is PV = nRT, where n is the value you are searching for.

P = 100.0 kPA

V = 50.0 dm^3

n = ?

R = 8.314

T = 50 celsius converted to kelvin (323 k)

Multiply the pressure times the volume (100*50) and divide it by the constant (R) by the temperature (8.314*323).

(100*50) / (8.314*323) = 5000 / 2685.422  = 1.86 moles

There are 1.19 moles of CO2 in the given sample.

To determine the number of moles of CO2 in the sample, we can use the ideal gas law, which is given by:

[tex]\[ PV = nRT \][/tex]

where:

- [tex]P[/tex] is the pressure of the gas,

- [tex]V[/tex] is the volume of the gas,

- [tex]n[/tex] is the number of moles of the gas,

- [tex]R[/tex] is the ideal gas constant, and

- [tex]T[/tex] is the temperature of the gas in Kelvin.

 First, we need to convert the temperature from degrees Celsius to Kelvin:

[tex]\[ T(K) = T(°C) + 273.15 \][/tex]

[tex]\[ T(K) = 50°C + 273.15 = 323.15 K \][/tex]

Next, we need to ensure that the volume is in cubic meters [tex](m^3)[/tex] since the standard units for the ideal gas constant [tex]R[/tex] are [tex]J/(mol*K)[/tex]when pressure is in pascals [tex]Pa[/tex] and volume is in cubic meters. Note that 1 [tex]dm^3[/tex] is equivalent to 0.001 m³:

[tex]\[ V = 50.0 \text{ dm}^3 \times \frac{0.001 \text{ m}^3}{1 \text{ dm}^3} = 0.0500 \text{ m}^3 \][/tex]

 Now we can plug in the values into the ideal gas law equation:

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

[tex]\[ n = \frac{(100.0 \text{ kPa} \times \frac{1000 \text{ Pa}}{1 \text{ kPa}})(0.0500 \text{ m}^3)}{(8.314 \text{ J/(mol·K)})(323.15 \text{ K})} \][/tex]

[tex]\[ n = \frac{(100,000 \text{ Pa})(0.0500 \text{ m}^3)}{(8.314 \text{ J/(mol·K)})(323.15 \text{ K})} \][/tex]

[tex]\[ n = \frac{5000 \text{ J}}{2684.8695 \text{ J/(mol)}} \][/tex]

[tex]\[ n \approx 1.19 \text{ moles} \][/tex].

 Therefore, there are approximately 1.19 moles of CO2 in the 50.0 dm³ sample at a pressure of 100.0 kPa and a temperature of 50°C.

Answer:

Kelvin

Explanation: