3.14 Lab: Reconstruct Geologic History Assignment k12

Answer:

the answer is A

Explanation:

edg 2020

Answer:

the air above a wildfire/A

Explanation:

The question requires us to calculate the amount of energy absorbed by the reaction, considering the molar enthalpy for oxygen gas (O2) and that 80.6 g of oxygen were reacting.

The following information was provided by the question:

Balanced chemical reaction:

Molar enthalpy of reaction for O2: +499.0 kJ/mol

Mass of O2 reacting: 80.6 g

To solve this problem, we need to calculate the amount of moles that corresponds to the mass of O2 given and then use this value and the molar enthalpy provided to calculate how much heat would be absorbed by the reaction.

First, we need the molar mass of O2. Knowing that the atomic mass of O is 15.99 u:

molar mass (O2) = (2 * 15.99) = 31.98 g/mol

Now, we use the molar mass to calculate the number of moles in 80.6 g of O2:

31.98 g O2 ------------------------ 1 mol O2

80.6 g O2 ------------------------- x

Solving for x, we'll have:

There are 2.52 moles of O2 reacting and next we need to calculate the amount of heat absorbed considering this.

The molar enthalpy of O2 tells us how much heat is abosrbed when 1 mol of O2 reacts. Thus, we can use it to calculate the amount of heat absorbed when 2.52 moles of O2 react:

1 mol O2 ----------------------- 499.0 kJ

2.52 mol O2 ----------------- y

Solving for y, we'll have:

Therefore, 1257.5 kJ of energy are absorbed when 80.6 g of O2 are reacting.

We can fill in the boxes to answer the question as it follows:

Answer: 1257.5

Units: kJ

Answer:

1. How many moles of oxygen will occupy a volume of 2.5 liters at 1.2 atm and 25° C? PV = V (1.2 n. 0821) (298) = 123 mols 2.

2.0 moles of oxygen gas will occupy a volume of 6.67 L at the same temperature and pressure.

Moles is a unit of measurement used in chemistry to express the amount of a substance. It is a counting unit that represents the number of particles, such as atoms, molecules, or ions, in a given sample.

One mole of a substance is defined as the amount of that substance that contains Avogadro's number of particles, which is approximately 6.022 x 10²³. This number is based on the concept that atoms, molecules, and ions are extremely small and difficult to count individually, so using moles allows for a more practical and convenient representation of quantities.

Given:

Moles of oxygen gas (initial) = 0.45 mol

Volume of oxygen gas (initial) = 1.5 L

Moles of oxygen gas (final) = 2.0 mol

Volume of oxygen gas (final) = ?

Using the principle of molar volume, we can set up the following ratio:

(0.45 mol / 1.5 L) = (2.0 mol / V)

V = (1.5 L × 2.0 mol) / 0.45 mol

V = 6.67 L

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(A) \(2Al(s) + 3O2(g) -- > Al2O3(s)\),  (B) \(Ca + SO4 -- > CaSO4\),

(C) \(2Mg + Br2 -- > 2MgBr2\) are reactions that occur that would form \(Al2O3\), \(CaSO4\), and \(MgBr2\) as resultant ionic compounds.

Al2O3 is obtained as the empirical formula if we combine two Al3+ ions and three O2- ions, using subscripts to show the number of each ion in the formula. An ionic compound is aluminum oxide. It has two aluminum atoms for every three oxygen atoms, according to this definition. It is a result of the reaction between oxygen and aluminum. Calcium ion and sulphate ion combine to generate the chemical known as calcium sulphate. Sulfate and calcium ions each have two positive charges (Ca2+) and two negative charges (SO42), and they combine to create the neutral molecule CaSO4. Bromine and magnesium are combined to form magnesium bromide. Magnesium bromide has the chemical formula MgBr2.

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The concentration of the NaCl solution after evaporation is 0.792 M.

To solve this problem, we can use the formula:

C1V1 = C2V2

Where C1 and V1 are the initial concentration and volume, and C2 and V2 are the final concentration and volume.

Given:

C1 = 0.556 M

V1 = 0.150 L

V2 = 0.105 L

We can rearrange the formula to solve for C2:

C2 = (C1V1)/V2

Substituting the given values, we get:

C2 = (0.556 M x 0.150 L) / 0.105 L

C2 = 0.792 M

Therefore, the concentration of the NaCl solution after evaporation is 0.792 M.

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Answer:

Example 1

palladium(II) nitrate,

Example 2

Metal catalysts such as Fe, Ni, Mo, and Co are routinely used in the manufacture of CNMs.

Explanation

The three metals used in catalytic converters — rhodium, platinum and palladium — are part of a category known as platinum group metals, or PGMs, which are known for their catalytic properties.

Based on the balance given, the statements that are true if you were to use this balance to measure the mass of a sample are option B and G.

A scale or balance is an instrument which is used to measure weight or mass of an object. These are also known as mass scales, weight scales, mass balances, and weight balances. The traditional scale consists of two plates or bowls suspended at equal distances from a fulcrum. There are several varieties of balances, with various limits on their accuracy. Two common kinds of balances are the centigram (0.00) and the analytical (0.0000). The uncertainty of a centigram balance is one hundredth of a gram (± 0.01 g). A mass that falls between 1 gram and 9 grams measured on this balance will always have 3 significant figures as it will read 1.00 or 9.00 on the scale.

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Answer:

The combustion of diborane (B2H6) is as follows:

2B2H6(g) + 6O2(g) → 4H2O(g) + B4O(g)

The balanced chemical equation shows that 2 moles of B2H6 react with 6 moles of O2 to produce 4 moles of H2O and 1 mole of B4O. We can use this information to calculate the amount of heat released by the combustion of 0.491 g of B2H6:

0.491 g B2H6 × (1 mol B2H6/27.67 g B2H6) × (1 mole B4O/2 moles B2H6) × (-2037 kJ/mol B4O) = -7.89 kJ

The negative sign indicates that the reaction releases heat.

The heat released by the reaction is absorbed by the calorimeter, which causes its temperature to increase. We can use the equation:

q = Ccalorimeter × ΔT

where q is the amount of heat absorbed by the calorimeter, Ccalorimeter is the heat capacity of the calorimeter, and ΔT is the change in temperature of the calorimeter.

Rearranging the equation, we get:

ΔT = q/Ccalorimeter

Substituting the values we obtained, we get:

ΔT = (-7.89 kJ)/(7.854 kJ/°C) = -1.005°C

The negative sign indicates that the temperature of the calorimeter decreases by 1.005°C. Therefore, the final temperature of the calorimeter is:

19.63°C - 1.005°C = 18.625°C

Rounding to the appropriate number of significant figures, the final temperature of the calorimeter is 18.6°C.

Hope this is what you are looking for.

Answer:

Exothermihic chart

Explanation:

Answer:

8

Explanation:

The two functional groups that the aminoacid has according to the picture are amine and carboxyl.

In chemistry and related areas, a functional group can be defined as a group of atoms bonded in a specific molecule that can affect the was the molecule reacts or the specific behavior of it.

In the case of the molecule presented, which is an amino acid, two functional groups can be identified:

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Answer:

Ionic bond

CaO is an ionic bond. Two-element compounds are usually ionic when one element is a metal and the other is a non-metal. It is made up of one metal ion/cation(Ca^2+) and an non-metal ion/anion(O^2-).

The reason for this is that water is a polar molecule and one water molecule is attracted to the other by a hydrogen bond.

The term entropy refers to the degree of disorder in a molecule. The more disorderly a molecule is, the higher its entropy.

The fact that water is a polar molecule and one water molecule is attracted to the other by a hydrogen bond thus, two water molecules represent more entropy than two hydrogen molecules plus an oxygen molecule.

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The density of a sample of NH\(_3\)(g) at a pressure of 1.00 atm is 0.869 g/L. 592m/s is the square velocity (in m/s) of the molecules in this sample.

The velocity of a gas molecule at a certain temperature, which corresponds to point P in the graph, is 200 ms. At the given temperature, the rms velocity of a gas molecule is about. Molecular count (A) 163ms (C) 245ms (B) 217 milliseconds; (D) 226 milliseconds. The rms velocity of a particular amount of gas molecules at 27oC and 1.0 105 Nm⁻² pressure is 200 msec-1.

velocity = √3p/density

           =√3/0.869

          =592m/s

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Sulfanilamide (NH2-SO2-NH-C6H4-NH2) can be represented by the following Lewis structure.

What is the Lewis structure?

The Lewis structure for a molecule is a type of structural formula that shows how the atoms are bonded together in a molecule. It uses symbols to represent the elements and to show the number of valence electrons. It also shows the number of covalent bonds between the atoms and any lone pairs of electrons.

N-H  |  S=O  |  N-C=C-C=C-C=C-N

H   |       |   H

H   |       |   H

H   |       |   H

The Lewis structure of sulfanilamide (NH2-SO2-NH-C6H4-NH2) consists of two nitrogen atoms, two oxygen atoms, and six hydrogen atoms. The two nitrogen atoms are bonded to each other by a double bond, and each nitrogen is also bonded to two hydrogen atoms. The two oxygen atoms are both single bonded to the two nitrogen atoms, and each oxygen is also bonded to one hydrogen atom. The six hydrogen atoms are all single bonded to the other atoms in the structure.

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The answer is in the photo.

Answer:

The temperature of the iron block is 68.5°C.

Explanation:

The heat released during condensation of water is used to warm the iron block:

q = m_H2O * ΔH_vap = m_fe * c_fe * ΔT

where q is the heat released, m_H2O is the mass of water condensed, ΔH_vap is the enthalpy of vaporization for water, m_fe is the mass of iron, c_fe is the specific heat capacity of iron, and ΔT is the change in temperature of the iron block.

Rearranging the equation gives:

ΔT = (m_H2O * ΔH_vap) / (m_fe * c_fe)

Substituting the given values gives:

ΔT = (0.95 g * 44.0 kJ/mol) / (75.0 g * 0.449 J/(g°C))

ΔT = 46.5°C

Therefore, the final temperature of the iron block is:

T_f = T_i + ΔT = 22°C + 46.5°C = 68.5°C.

The final temperature of the iron block is 68.5°C.

Without conducting an experiment, one can determine if a species in a solution is acidic or basic by using a litmus paper.

Acidic species would turn a blue litmus paper to red but have no effects on red litmus paper.

Basic species would turn a red litmus paper to blues but have no effects on blue litmus paper.

Thus, in order to determine if a species in a solution is acidic or basic without conducting any experiment, dipping a litmus paper into the solution would give an indication.

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Answer:

a functional group is a specific group of atoms or bonds within a compound that is responsible for the characteristic chemical reactions of that compound.

Explanation:

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To ensure fire safety, a minimum clear distance of 100 feet must be maintained around an outdoor hazardous materials storage tank, free of any combustible materials or vegetation. So option D is correct.

This requirement for a minimum clear distance of 100 feet around hazardous materials storage tanks is a commonly accepted standard in the industry for fire safety purposes. Keeping the area clear of combustible materials and vegetation helps to prevent fire from spreading to the tank and potentially causing a hazardous release of the stored materials.

This requirement is based on the assumption that a fire spreading from surrounding combustible materials could rapidly increase in intensity and reach the tank, putting personnel and the surrounding community at risk. By maintaining a clear distance of 100 feet, the likelihood of such an event is significantly reduced.

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Answer:

There are 0.195 moles.

Explanation:

1 mol of any gas under STP (meaning 1 atm and 273 K) will occupy 22.4 liters.

With the information above in mind, we can calculate how many moles will occupy 4.38 liters:

In 4.38 liters of a gas at STP there will be 0.195 moles.

It is false because NaCl has a higher bond energy than Nal.

The melting point of a substance is determined by the strength of the intermolecular forces between its atoms or ions. In the case of NaCl, the strong electrostatic attraction between the positively charged Na+ ions and the negatively charged Cl- ions results in a relatively high melting point.

In contrast, NaI is a ionic compound with a lower bond energy between the atoms. So, it has lower melting point in comparision to NaCl. So the statement is False, NaCl has a higher melting point than NaI.

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Answer:

"Granite forms from silica-rich magmas. Felsic magmas are thought to form by addition of heat or water vapor to rock of the lower crust, rather than by decompression of mantle rock, as is the case with basaltic magmas."

Explanation:

Answer:

The more you get closer to a substance in the periodic table things that are included into the substance start to get bigger

Explanation:

Answer:

Substance C

Explanation:

Substance C would be the answer because Substance C has a lower attraction level. Because of this, it takes more energy to take out of in order to become a liquid.

Answer:

It will lead to a decrease in the boiling points

Explanation:

Decreasing the pressure exerted on a compound reduces d boiling points because a high temperature is needed also to boil a compound

The boiling points of two compounds differ by 60°C at atmospheric pressure, the effect on the relationship by decreasing the pressure to 1mm  is the boiling point will decrease with decreasing the atmospheric pressure.

Boiling point is defined as the temperature at which the pressure exerted by the surrounding upon a liquid is equaled by the pressure exerted by the pressure of the liquid, under this condition addition of heat results in the transformation of the liquid into its vapors without raising the temperature.

Boiling point is also defined as the temperature at which vapor pressure of the liquid become equal to the atmospheric pressure.

Thus, the boiling points of two compounds differ by 60°C at atmospheric pressure, the effect on the relationship by decreasing the pressure to 1mm  is the boiling point will decrease with decreasing the atmospheric pressure.

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