The primary cause for an increase in atmospheric co2 is combustion of fossil fuels. Another significant contributor to co2 increase is ____________.

Answer:

20. mol

Explanation:

i got it right on my quiz

The given Ksp for Mn(OH)2 is 2.0 x 10-13. To calculate the pH at which Mn(OH)2 will begin to precipitate from a solution, we will use the following steps:

Step 1: Write the chemical equation for Mn(OH)2 dissociating in water

Mn(OH)2 ⇌ Mn2+ + 2OH-

Step 2: Write the Ksp expression for Mn(OH)2Ksp = [Mn2+][OH-]^2 = 2.0 x 10^-13

Step 3: Write the expression for the equilibrium concentration of OH-2[OH-] = √(Ksp / [Mn2+])

We know that the initial concentration of Mn2+ is 0.10 M[OH-] = √(2.0 x 10^-13 / 0.10) = 6.32 x 10^-7 M

Step 4: Calculate the pOH of the solution pOH = -log[OH-] = -log(6.32 x 10^-7) = 6.20pH = 14.00 - pOH = 14.00 - 6.20 = 7.80

Therefore, Mn(OH)2 will begin to precipitate from a solution at pH 7.80.

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Answer:

C. would be the correct option.

Explanation:

Burning gasoline is a chemical change because when gasoline is ignited, water and carbon dioxide are produced. Water freezing to form ice would be a physical change since its state of matter has changed, but not the water itself. Sugar dissolving in water is also a physical change because all it's really doing is just forming bubbles and changing the color. Choice D. would also be a physical change since the piece of metal is still a piece of metal, it just expanded when the temperature increased.

Answer:

11.2823 grams of NH3 are produced
Explanation:

No. of moles for H2 = 22.3/22.4 = 0.9955 moles

By calculating number of moles produced of NH3, by using ratios:

N2 + 3H2 → 2NH3
1    :   3    :    2
? : 0.9955:  ?

part value = 0.9955/3 = 0.33183
No. of moles for NH3 = 2 * 0.33183 = 0.6637 moles

mass of produced NH3 (Molar mass = 17 g/mol) = 0.6637*17 = 11.2823 grams

The balanced equation for the dissolution of Ag3PO4 in water is the solubility product constant (Ksp) for Ag3PO4 is 2.1 × 10-17.

Constants are used to make sure that the variables being tested are the only factors affecting the outcome of an experiment. For example, in an experiment to test the effect of temperature on the rate of a chemical reaction, the concentration of reactants, the surface area of reactants, and the pressure may all be kept constant to ensure that any changes in the rate of reaction are due to temperature alone. Physical constants are fundamental values that describe the properties of the universe, such as the speed of light, the gravitational constant, or the charge of an electron. These constants are usually denoted by specific symbols and are widely used in various scientific calculations and theories.Mathematical constants are numbers that have special significance in mathematics and appear repeatedly in various mathematical formulas and equations.

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Answer:

The oxidation state of chromium is +6

Explanation:

Let the oxidation number be x

Since The sum of all oxidation numbers are equal to zero,

So,

(+1)2 + 2x + (-2)7 = 0

+2 +2x -14 = 0

2x-12 = 0

2x = +12

Dividing 2 to both sides

x = +6

Based on the given equilibrium constant (K = 5.6 x 10⁵) and the negative enthalpy change (ΔH° = -91.8 kJ/mol), we can justify that the synthesis of NH₃ is thermodynamically favorable at 298 K and constant pressure.

To determine whether the reaction is thermodynamically favorable at 298 K and constant pressure, we can use the equilibrium constant (K) and the enthalpy change (ΔH°) of the reaction. Here, the given values are;

Equilibrium constant (K) = 5.6 x 10⁵

Enthalpy change (ΔH°) = -91.8 kJ/mol

To assess the thermodynamic favorability of a reaction, we consider both the magnitude and sign of ΔH°. If ΔH° is negative (exothermic), it indicates that the reaction releases energy and is likely to be thermodynamically favorable.

In this case, the given ΔH° value of -91.8 kJ/mol indicates that the reaction is exothermic. Since the forward reaction releases energy, it implies that the reaction is thermodynamically favorable at 298 K and constant pressure.

The equilibrium constant (K) can further support this conclusion. For a reaction to be thermodynamically favorable, the equilibrium constant should be greater than 1. In this case, the given equilibrium constant (K = 5.6 x 10⁵) is significantly greater than 1, indicating that the reaction favors the formation of products (NH₃) at equilibrium.

Therefore, based on the given equilibrium constant (K = 5.6 x 10⁵) and the negative enthalpy change (ΔH° = -91.8 kJ/mol), we can justify that the synthesis of NH₃ is thermodynamically favorable at 298 K and constant pressure.

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The magnesium ion is formed by the removal of two electrons hence the charge on the magnesium ion is +2.

An ion is formed by the removal or addition of an electron from an atom. We know that an ion could be positive or negative. The ion is positive when an electron s removed and negative when an electron is added.

Now the magnesium ion is formed by the removal of two electrons hence the charge on the magnesium ion is +2.

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Explanation:

ans b hcl and ccl4

both these compounds are formed by sharing of electrons......

To write the net ionic equation for the reaction that occurs when aqueous solutions of sodium hydroxide and perchloric acid are combined, first perform the complete ionic equation and then identify and eliminate the ions that do not participate.

A net ionic equation shows only the chemical species involved in the reaction

A net ionic equation is written with the smallest possible integer values as stoichiometric coefficients.

HClO4 (l) + NaOH (aq) → NaClO4 (aq) + H2O (l)

H+(aq) + OH−(aq) → H2O(l)

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Based on the observations from, the substance that water is more attracted to are polar substances.

Water is a compound made up of 2 atoms of hydrogen and 1 atom of oxygen.

Water molecule is polar due to the unequal sharing of electrons between the atoms and the unsymmetrical shape of the molecule.

Since water molecules are polar, they are more attracted to molecules that are also polar.

Thus, based on the observations from, the substance that water is more attracted to are polar substances.

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Answer:

S+O2⇒SO2

Explanation:

Answer:

The balanced equation is S + O2 → SO2

Gas pressure can be described as the force exerted per unit area by gas molecules as they collide with the surface of a container. It is a measure of the average kinetic energy of the gas molecules.

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The pressure of carbon dioxide is needed to dissolve 100.0 mg of carbon dioxide in 1.00 L of water option (a) 0.0649 atm.

We can solve this problem using Henry's Law, which states that the solubility of a gas in a liquid is directly proportional to the partial pressure of the gas above the liquid. Mathematically, this can be expressed as:

C = k * P

where C is the concentration of the gas in the liquid, P is the partial pressure of the gas above the liquid, and k is the proportionality constant known as Henry's Law constant.

To find the partial pressure of carbon dioxide needed to dissolve 100.0 mg of carbon dioxide in 1.00 L of water, we first need to convert the mass of carbon dioxide to moles:

100.0 mg / (44.01 g/mol) = 0.00227 mol

The concentration of carbon dioxide in the water is then:

C = 0.00227 mol / 1.00 L = 0.00227 M

The  pressure of carbon dioxide is needed to dissolve 100.0 mg of carbon dioxide in 1.00 L of water is

Next, we can use Henry's Law to find the partial pressure of carbon dioxide:

P = C / k

The Henry's Law constant for carbon dioxide in water at 25 degrees C is 3.4 x \(10^{(-2)\)M/atm.

P = (0.00227 M) / (3.4 x \(10^{(-2)\) M/atm) = 0.0668 atm

Therefore, the answer is closest to option (a) 0.0649 atm.

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The term that refers to a compound that helps maintain a stable pH by binding protons if H+ concentration begins to rise, and releasing them into solution if H+ concentration falls is a buffer. Buffers are substances that are able to resist changes in pH, and are essential for maintaining the proper pH in biological systems. They work by balancing the concentration of H+ ions in a solution, preventing pH from becoming too acidic or too basic.

Buffers are crucial in maintaining the proper pH in many biological systems. pH is a measure of the concentration of H+ ions in a solution, and changes in pH can have drastic effects on biological processes. Buffers are able to maintain a stable pH by acting as both an acid and a base. When H+ ions are added to a solution, buffers are able to absorb these ions, preventing the pH from dropping too much. Similarly, when H+ ions are removed from a solution, buffers are able to release H+ ions, preventing the pH from rising too much. Buffers are found throughout the body, including in the blood, where they help to maintain a stable pH despite changes in metabolic activity.

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There are approximately 1.5055 ×\(10^{23\) \(Na_2SO_4\)particles present in the solution.

To calculate the mass of anhydrous sodium tetraoxosulphate (VI) (\(Na_2SO_4\)) present in 500 cm3 of 0.5 M solution, we can use the equation:

Mass (g) = Volume (L) × Concentration (M) × Molar mass (g/mol)

First, let's convert the volume from cm3 to L:

500 cm3 = 500/1000 L = 0.5 L

Next, we can substitute the values into the equation:

Mass = 0.5 L × 0.5 mol/L × (2 × 23 g/mol + 32 g/mol + 4 × 16 g/mol)

= 0.5 × 0.5 × (46 + 32 + 64)

= 0.5 × 0.5 × 142

= 35.5 g

Therefore, the mass of anhydrous sodium tetraoxosulphate (VI) present in 500 cm3 of 0.5 M solution is 35.5 g.

For 1b, to calculate the number of \(Na_2SO_4\)particles present in the solution, we can use Avogadro's number (6.022 ×\(10^{23\) particles/mol) and the number of moles of Na2SO4.

The number of moles of Na2SO4 can be calculated using the formula:

Moles = Concentration (M) × Volume (L)

Moles = 0.5 mol/L × 0.5 L

= 0.25 mol

Now we can calculate the number of \(Na_2SO_4\)particles:

Number of particles = Moles × Avogadro's number

= 0.25 mol × 6.022 ×\(10^{23\) particles/mol

= 1.5055 × \(10^{23\) particles

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Answer:

2NaHCO3---> Na2CO3+H2O+CO2

Explanation:

*Note, I'm assuming you forgot to add the H2O in your question, because the equation couldn't exist without it

Answer:

120 kPa = 1.25 L

Explanation:

Because 120/1.50 is 80. And then if you divide 100 by 80, you get 1.25.

ii: [Al(OH\(_{2}\))\(_{6}\)]** =[Al(OH)(OH\(_{2}\))s]\(_{2}\)+ + H, is associated with the definition of Ka.  Option b is the correct answer.

Ka represents the acid dissociation constant, which is a measure of the extent to which an acid donates protons (H+) in a solution. In this equation, the [Al(OH\(_{2}\))\(_{6}\)] ** complex ion is donating a proton (H+) to form  [Al(OH)(OH\(_{2}\)) s]\(_{2}\)+ and H. This process is an example of acid dissociation, which is directly related to the concept of Ka.  Understanding the acid dissociation process and the concept of Ka is essential for studying acid behavior.

Option b is the correct answer.

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The equation E = mc² describes the relationship between energy and mass and reveals that energy and mass are interchangeable and interrelated.

The equation E = mc², formulated by Albert Einstein in his theory of special relativity, is a fundamental equation in physics. It establishes the equivalence between energy (E) and mass (m) and demonstrates their interdependence.

In the equation, c represents the speed of light in a vacuum, which is a constant value. The equation states that the energy (E) of an object is equal to its mass (m) multiplied by the square of the speed of light (c) squared.

This equation implies that mass can be converted into energy and vice versa. It highlights the concept of mass-energy equivalence, which suggests that mass can be considered a form of energy. When mass is converted into energy, it can be released in various forms, such as heat, light, or other types of energy.

Furthermore, the equation reveals that a small amount of mass can contain an enormous amount of energy. The speed of light squared (c²) is a large value, indicating that even a tiny amount of mass can yield a significant amount of energy when converted.

The equation E = mc² describes the identities of energy and mass by establishing their interdependence and interchangeability. It demonstrates that mass can be converted into energy and vice versa, highlighting the concept of mass-energy equivalence. This equation reveals the profound relationship between energy and mass, emphasizing that even a small amount of mass can contain a substantial amount of energy.

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Give a handwritten explanation and response. Estimate the expected melting temperature of cadmium (Cd), vanadium, and other elements based on the patterns you have found.

What does melting point mean?

The temperature at which a pure substance's solid and liquid states can coexist in equilibrium is known as the melting point. A solid's temperature will rise when heat is added to it until its melting point is reached.

How do melting and boiling points differ?

The melting point

The temperature that a quality of output into a liquid under normal air pressure is known as the melting point. The temperature at which a liquid's vapor pressure equals the pressure around it, turning the liquid into vapor (and vice versa).

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When a pi bond is formed, one hydrogen is lost from each of the atoms involved in the bond formation. This is because a pi bond is formed when two parallel p orbitals overlap sideways, and each p orbital contains one electron.

Therefore, in order for the electrons to form a bond, one electron from each atom must be involved, leading to the loss of one hydrogen atom from each atom.

When a pi bond is formed, two hydrogen atoms are lost. This occurs because the pi bond involves the sharing of two additional electrons between two atoms, typically carbon, which results in the need to release two hydrogen atoms to maintain proper valence.

Valence is a term used in chemistry and physics to describe the number of electrons that an atom can gain, lose, or share in order to form a chemical bond with another atom. The valence of an atom is determined by the number of electrons in its outermost shell, or valence shell.

The valence of an atom is important because it determines its ability to form chemical bonds with other atoms. Atoms with a low valence (i.e. only a few electrons in their outermost shell) tend to lose those electrons and become positively charged ions, while atoms with a high valence (i.e. many electrons in their outermost shell) tend to gain electrons and become negatively charged ions.

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To calculate the standard Gibbs free energy change (ΔG°) for the reaction: Zn(s) + 2H⁺(aq) → Zn²⁺(aq) + H₂(g)We can use the equation:ΔG° = -nFΔE°, where:ΔG° is the standard Gibbs free energy change, n is the number of electrons transferred in the balanced equation, F is the and Faraday constant (approximately 96485 C/mol),

ΔE° is the standard cell potential (also known as E°cell) for the reaction. A number of electrons are transferred in the balanced equation. From the equation, we can see that 2 electrons are transferred. Next, we calculate ΔE°cell by summing the standard reduction potentials (E°) of the half-reactions involved:

ΔE°cell = E°cathode - E°anode

ΔE°cell = (0.00V) - (-0.76V) = 0.76V

Now, we substitute the values into the equation to calculate ΔG°:

ΔG° = -nFΔE°

    = -(2 mol) × (96485 C/mol) × (0.76 V)

    ≈ -147,207 J

Expressing the answer in three significant figures, the value of ΔG° for the reaction is approximately -147,207 J (or -147 kJ).

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Answer:

I think its B

Explanation:

ANSWER

Water molecule is a compound

EXPLANATION;

Water molecule is formed from the combination of oxygen and hydrogen atoms

Recall, that compound is the combination of two or more elements that are chemically combined together

Therefore, water molecule is a compound

Answer:

False. Humans are the only reason the earth is polluted

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