Determine the pH of a 3.4 x 10^-6 M solution of HNO3

Answer:

9.5 mol

Explanation:

Let's consider the unbalanced equation for the combustion of tetraethyl-lead (IV).

Pb(C₂H₅)₄ + O₂ ⇒ PbO + CO + H₂O

Pb atoms are balanced. We will balance C atoms by multiplying CO by 8.

Pb(C₂H₅)₄ + O₂ ⇒ PbO + 8 CO + H₂O

Then, we will balance H atoms by multiplying H₂O by 10.

Pb(C₂H₅)₄ + O₂ ⇒ PbO + 8 CO + 10 H₂O

Finally, we get the balanced equation by multiplying O₂ by 9.5.

Pb(C₂H₅)₄ + 9.5 O₂ ⇒ PbO + 8 CO + 10 H₂O

All in all, we need 9.5 moles of O₂ to burn 1 mole of Pb(C₂H₅)₄.

The non-metal elements in Group 7 – known as the halogens – get less reactive as you go down the group

Answer & Explanation:

The reactivity of elements in Group VII, also known as Group 17, decreases with increasing atomic radius. This is because halogens have high electronegativities and a proclivity to gain electrons in noble gas configurations. Myths are traditional stories or beliefs that explain cultural or societal beliefs, customs, or natural phenomena. They can be passed down through generations and can be based on true or fictitious events. Mythology, on the other hand, is the collection of myths associated with a specific culture or religion. Mythology can be amplified through retelling, incorporation into religious practices; association with significant events or figures, and adaptation into other media forms such as literature, film, or art.

2) The heat capacity of aluminum is 219.44 J/mol.°C.

3) a) the experimental ΔHs of ice is -0.154 kJ/mol.

b) too high

Calculate the heat released by the aluminum:

q = mcΔT

where q = heat released, m = mass of aluminum, c = specific heat capacity of water and ΔT = change in temperature.

q = (24.7 g) (0.903 J/g°C) (100.0°C - 23.4°C)

q = 18643.26 J

Next, calculate the heat absorbed by the calorimeter:

q = mcΔT

q = (99.5 g + 24.7 g) (15.8 J/°C) (23.4°C - 19.5°C)

q = 4009.92 J

The heat released by the aluminum is equal to the heat absorbed by the calorimeter and water:

18643.26 J = 4009.92 J + q3

where q3 = heat absorbed by the water.

q3 = 14633.34 J

Calculate the molar heat capacity of aluminum:

Cp,m = q3 / (nΔT)

where Cp,m = molar heat capacity, n = number of moles of aluminum, and ΔT = change in temperature.

n = m / M

where m = mass of aluminum and M = molar mass of aluminum (26.98 g/mol).

n = 24.7 g / 26.98 g/mol

n = 0.916 mol

Cp,m = 14633.34 J / (0.916 mol * 76.6°C)

Cp,m = 219.44 J/mol.°C

Therefore, the heat capacity of aluminum is 219.44 J/mol.°C.

3) (a) To calculate the experimental ΔHs of ice, we first need to calculate the heat gained by the water and the heat lost by the ice during the process.

Heat gained by water = mass of water × specific heat capacity of water × change in temperature

= 100.0 g × 4.184 J/g·°C × (-20.1°C)

= -8,423.84 J

Heat lost by ice = mass of ice × heat of fusion of ice

= 25.6 g × 6.01 kJ/mol

= 154.496 J

Since the process is assumed to be adiabatic (no heat exchange with the surroundings), the heat gained by the water must be equal to the heat lost by the ice.

Thus, -8,423.84 J = 154.496 J = -8,269.344 J

The negative sign indicates that the process is exothermic. Therefore, the experimental ΔHs of ice is:

ΔHs = -154.496 J/mol = -0.154 kJ/mol

(b) If the student forgets to include the calorimeter term in the calculation, the calculated ΔHs of ice will be too high. This is because the heat absorbed by the calorimeter during the process is not accounted for, leading to an overestimation of the heat gained by the water and underestimation of the heat lost by the ice.

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Answer:

0.005712

Explanation:

5.712 grams = 0.005712 kilograms

Answer:

It would be 0.005712

Explanation:

The ion with an electron configuration of nd6 is Pd²+.

The electron configuration of an atom or ion is the dispersion of electrons in its orbitals. It describes how electrons are grouped in an atom's or ion's many energy levels and sublevels.

The number of electrons in each energy level and sublevel is often shown in shorthand notation in the electron configuration. Carbon's electron configuration, for example, can be represented as:

1s² 2s² 2p²

This means that carbon has a total of 6 electrons, with 2 in the 1s orbital, 2 in the 2s orbital, and 2 in the 2p orbital.

An ion's electron configuration may differ from that of its parent atom due to electron loss or gain.

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Explanation:

The particles in solids are arranged in a regular way. The particles in solids move only by vibrating about a fixed position. This gives solids a fixed shape and means that they cannot flow like liquids. The hotter a solid gets, the faster its particles vibrate.

Answer:

Fatty foods become rancid due to the process of rancidity

Answer

The Lewis structure of SO2 (stable form) is shown below;

The unstable form SO2 Lewis structure is also shown below:

Answer:

Explanation:

NO₂ --> NO + O₂

We need the same number of each atom on both sides of the equation.

There is 1 nitrogen on the left and right sides of the equation. At this point, the nitrogens are balanced on both sides of the equation.

There are 2 oxygens on the left side and a total of 3 oxygens on the right side (1 oxygen in NO and 2 oxygens in O₂). The oxygens are not balanced.

We can place a 2 in front of NO₂ on the left side and 2 in front of NO on the right side. This will give 4 oxygens on the left side and a total of 4 oxygens on the right side.

We also have now 2 nitrogens on the left side and 2 on the right side.

2 NO₂ --> 2 NO + O₂

The equation is balanced with 2 nitrogens and 4 oxygens on both sides of the equation.

Answer:

The answer is "12.06"

Explanation:

Given:

\(M(HBrO) = 0.3\ M\\\\V(HBrO) = 20 \ mL\\\\M(KOH) = 0.15 \ M\\\\V(KOH) = 64 \ mL\)

\(\to mol(HBrO) = M(HBrO) \times V(HBrO) = 0.3 M \times 20 mL = 6 \ mmol\\\\\to mol(KOH) = M(KOH) \times V(KOH)= 0.15 M \times 64 mL = 9.6 mmol\)

  6 mmol of both will react

excess KOH remaining\(= 3.15 \ mmol\)

Volume\(= 20 + 64 = 84 \ mL\)

\([OH^{-}] = \frac{ 9.6 \ mmol}{84\ mL} = 0.01142\ M\)

use:

\(pOH = -\log [OH^-]\)

        \(= -\log (1.142\times 10^{-2})\\\\= 1.94\)

use:

\(PH = 14 - pOH\)

       \(= 14 - 1.94\\\\= 12.06\)

The pH of the resulting  solution is  12.63.

The equation of the reaction is;

HBrO(aq) + KOH(aq) ------> KOBr(aq) + H2O(l)

Number of moles of KOH= 64/1000 × 0.150 M = 0.0096 moles

Number of moles of HBrO = 20/1000 × 0.300 M = 0.0060 moles

Number of moles of excess base = 0.0096 moles -  0.0060 moles = 0.0036 moles

Total volume of solution = 64.0 mL +  20.0 mL = 84 mL = 0.084 L

Molarity of excess base =  0.0036 moles/0.084 L = 0.043 M

pOH = -log[OH-]

pOH = -log[ 0.043 M]

pOH = 1.37

pH + pOH = 14

pH = 14 -pOH

pH = 14 - 1.37

pH = 12.63

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1) Which statements are true?

Statement 1: TRUE.

The coefficients in a balanced chemical equation should be the smallest integers possible.

Statement 2: FASLE.

A chemical reaction is written like this:

Statement 3: TRUE.

We use the formulas and the states of the compounds in a chemical reaction.

Statement 4: FALSE.

We cannot change the identity of any compound involved in a chemical reaction. That's why we cannot change the subscripts.

Statement 5: FALSE.

The notation (aq) means aqueous. It means that the compound is dissolved in water.

1 and 3 are TRUE statements.

-1113.5kJ is the theoretical enthalpy of combustion.

What makes energy different from enthalpy?

The entire amount of heat energy that is either absorbed or released in a thermodynamic system is measured by enthalpy. Internal energy denotes all of the potential or moving energy present in a thermodynamic system.

Enthalpy of combustion is the term used to describe the change in a system's enthalpy that occurs when one mole of a substance fully burns in oxygen or air at a specific temperature.

C₂H5OH()+302(g) → 2CO2(g) + 3H₂O(1)

Reactants:

5 C-H : 5*412

1 C-C : 348

1 C-O: 358

3 O=O: 3* 496

1 O-H: 463

Products:

2*2 C=O : 4*743

2*3 O-H: 6*463

Enthalpy of Vaporization (kJ mol-¹) for :

Ethanol 42.5

Water 41​

Enthalpy of combustion : (5*412 + 348 + 358 + 3* 496 + 463 + 42.5) - ( 3*41 + 4*743 + 6*463)    

                                        : -1113.5kJ

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Answer:

Earth's thin outer shell is broken into big pieces called tectonic plates. These plates fit together like a puzzle, but they're not stuck in one place. They are floating on Earth's mantle, a really thick layer of hot flowing rock. The flow of the mantle causes tectonic plates to move in different directions.

Explanation:

The equation for the equilibrium constant (K) of the reaction studied in this exercise can be written as follows: K = ([\(CI_20\), 2-] * [\(H_20\)(1)]) / ([\(C0_4^ 2\)-] * [Ht])

In this equation, the concentrations of the species involved in the reaction are represented by the square brackets [ ]. The subscripts indicate the stoichiometric coefficients of each species in the balanced chemical equation.

The reaction being studied involves the following species:

\(C0_4^ 2\)- (ag) + 2Ht (ag) = \(CI_20\), 2- (ag) + \(H_20\)(1)

In the equilibrium constant expression, the concentration of \(CI_20\), 2- is multiplied by the concentration of \(H_20\)(1) and divided by the product of the concentrations of \(C0_4^ 2\)- and Ht. The stoichiometric coefficients in the balanced equation are used as exponents for the concentrations of the respective species.

It is important to note that the concentrations used in the equilibrium constant expression should be in molar units (mol/L) or expressed as partial pressures for gases.

Additionally, the equilibrium constant is specific to a given temperature, and its value provides information about the relative amounts of reactants and products at equilibrium.

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Answer:

2. Sunlight + Water + Carbon dioxide + Chlorophyll → Glucose + Oxygen

6. A. Oxygen

7.  C. Cellular respiration

8. A. Chemical energy

9. C. Lactic acid

10. B. Chlorophyll

11. C. Oxygen

12. D. Sunlight

13. A. Metabolism

Explanation:

I have been able to answer questions 2,6,7,8,9,10,11,12,13.

The mitochondria is the site where cellular respiration is carried out. During fermentation, energy is released and such process does not require oxygen. Lactic acid is built up when the muscles overwork themselves. The acid ferments when there is lack of oxygen and when that lack is greater than the energy used.

The process of photosynthesis results in the production of glucose and the release of oxygen which man takes in.  Chlorophyll traps sunlight and turns it into chemical energy. But it's not actually all the light energy that are absorbed.

The volume of the platinum solid is determined as 8.16 cm³.

The volume of the  platinum solid is calculated from its density and mass as shown below.

V = m/ρ

where;

Volume of the platinum solid is calculated as follows;

V = 175 g / 21.45 g/cm³

V = 8.16 cm³

Thus, the volume of the platinum solid is determined as 8.16 cm³.

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The number of molecules in 1 g of isopentyl acetate, C₇H₁₄O₂ is 4.21 * 10²¹ molecules.

Isopentyl acetate is a compound that is known as an alkanoate.

An alkanoate is a compound that is formed when an alkanol and an alkanoic acid react together, water is also produced.

The number of molecules in one gram of isopentyl acetate is determined from the molar mass of isopentyl acetate.

In one mole of isopentyl acetate, the number of molecules present is equal to the Avogadro number of molecules which is 6.02 * 10²³ molecules.

The molar mass of isopentyl acetate, C₇H₁₄O₂ = (12 * 7 + 1 * 14 + 16 * 2) g/mol

The molar mass of isopentyl acetate, C₇H₁₄O₂ = 130 g/mol

The number of moles in 1 g of isopentyl acetate, C₇H₁₄O₂ = 1/130

The number of moles in 1 g of isopentyl acetate, C₇H₁₄O₂ = 0.0077 moles

Number of molecules in 1 g of isopentyl acetate, C₇H₁₄O₂ = 0.0077 * 6.02 * 10²³

The number of molecules in 1 g of isopentyl acetate, C₇H₁₄O₂ = 4.21 * 10²¹ molecules.

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The balanced reaction equation of the reaction is; 2H2O + O2 → 2H2O2

This is a chemical equation that represents the reaction between water (H2O) and oxygen (O2) to form hydrogen peroxide (H2O2). The coefficients in front of each substance indicate the relative number of molecules involved in the reaction.

Recall that we can balance the reaction equation  by ensuring that the atoms of the elements on both sides of the reaction equation are the same as we have above.

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Answer:

a substance that dissolves in another substance

Explanation:

a substance into which another substance dissolves

Answer:

sol·ute

noun

1.

the minor component in a solution, dissolved in the solvent.

A molecule of sodium (Na2) will not arise in nature because sodium (Na) atoms only contain one valence electron. Since each of these Adam has only one electron to share, the true statement among the following is (c).

We now understand that each atom is often composed of smaller particles, despite the fact that its original term referred to a particle that couldn't be further divided—the tiniest thing that was possible. Since they serve as the foundation for atoms, these particles are commonly referred to it as subatomic particles.

Democritus, a Greek philosopher, originally introduced the idea of the atom about 450 B.C. . Unfortunately, for more than 2000 years, the concept was essentially lost. John Dalton reintroduced the atom in 1800. He created the atomic theory and offered proof that atoms exist.

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Answer:

is D I guess; photosphere

Answer: Gallium

Explanation:

Answer:

The sensory receptors send signals to Diego's brain cells. These signals are messages that help Diego figure out what to do next. As Diego thinks, more signals move from one brain cell to another.

The sensory receptors send signals to Diego's brain cells. These signals are messages that help Diego figure out what to do next. As Diego thinks, more signals move from one brain cell to another.

The capacity to react to stimuli is one of the traits of a living thing. The highly developed sensory system of humans can concurrently analyze thousands of incoming messages.

Dendrites of sensory neurons are specialized for receiving particular types of stimuli and are known as sensory receptors. There are three ways to classify sensory receptors.

Exteroceptors are located at or close to the skin's surface and are responsive to stimuli coming from the outside or the body's surface. These receptors include those for vision, hearing, smell, and taste as well as those for touch, pain, and temperature.

Therefore, The sensory receptors send signals to Diego's brain cells. These signals are messages that help Diego figure out what to do next. As Diego thinks, more signals move from one brain cell to another.

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The equation of line u, given that it is parallel to line t is:

y = –17x – 113

We know that the equation of straight line is given as

y = mx + c

Where

First, we shall determine the slope of line u. This can be obtained as follow:

y = –17x – 2

Comparing y = mx + c with y = –17x – 2,

The slope (m₁) = –17

Recall,

The slope of parallel lines are equal.

Thus,

The slope of line u, is given as:

m₂ = m₁ = –17

Finally, we shall obtain the equation of line u as follow:

y – y₁ = m₂(x – x₁)

y – 6 = –17(x – 7)

Clear bracket

y – 6 = –17x – 119

Rearrange

y = –17x – 119 + 6

y = –17x – 113

Thus, the equation of line u is y = –17x – 113

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Answer:

Equation of line is given as y = mx + c, where m is the gradient and c is the y-intercept.

Parallel lines have the same gradient so gradient of line u is -17.

Equation of line u is y = -17x + c

Substitute (7,6) into the equation to find c.

6 = -17(7) + c

c = 125

Hence, equation of line u is y = -17x + 125.

Answer:

x/2

Explanation:

X = 2 molecules of H2

For 2 molecules of H2, there's only 1 molecule of O2. Meaning, there's twice the amount of H2, so O2 = x/2 molecules.

I hope I'm understanding this question right.