HELPPP MEE I NEED HELPP PLEASE
Which person participates mostly in the quaternary level of an economy?
A. A coal miner
3. A car mechanie
C. A college professor
D. A car factory worker
SUBMIT
Answers
Answer:
B.Michanine
Explanation:
Answer: The answer is a college professor since people in the fourth level of industry create, share, and store information. They do research, give advice, report on events, and keep records. Furthermore, workers in the quaternary include teachers, librarians, accountants, scientists, and reporters, nor do the traits describe coal miners, car machines, and a car factory worker as these are the secondary level since their work involves manufacturing, make sure to study! You got this have a g’day. Again, the answer is C: A college professor.
Explanation:
Related Questions
(d) suppose the reactor is built and started up and the conversion is only 14%. chromatographic analysis shows that there is no cl2 in the product, but another species of molecular weight higher that that of dichloroethane is present. offer a likely explanation of the results.
Answers
The reason for the product only showing a conversion rate of 14% and the chromatographic analysis showing that there is no cl2 but another species of molecular weight higher than that of dichloroethane is that the reaction could be undergoing a substitution reaction rather than an addition reaction.
For a reaction to occur via an addition reaction, both the reactants double bonds must be broken, and the two new atoms must add to the molecule to form a new one.
But in the case of the given reaction, the reaction might be undergoing a substitution reaction rather than an addition reaction.
In substitution reactions, the chlorine atoms in the dichloroethane react with the hydrogen ions from the hydrochloric acid to produce hydrogen chloride, which can react with more dichloroethane to form trichloroethane.
This reaction, unlike addition, does not require the breaking of the double bond between the carbon atoms.
Chromatographic analysis is a method of separating the components of a mixture.
It allows the user to identify the presence of different substances in the given mixture. In this case, the analysis shows that the product has a species of molecular weight higher than that of dichloroethane. This is most probably due to the formation of trichloroethane.Thus, we can conclude that since the reaction is undergoing a substitution reaction, the product will have the presence of trichloroethane rather than dichloroethane.
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The effects of hydrogen bonding will cause which compound to have the highest boiling point?.
Answers
The boiling points of the compounds with hydrogen bonding increases with increase in size and electrons present in the compound.
The increase in boiling point happens because the molecules are getting larger with more electrons and so van der Waals dispersion forces become greater. Water is an ideal example of hydrogen bonding.each water molecule can potentially form four hydrogen bonds with surrounding water molecules: two with the hydrogen atoms and two with the with the oxygen atoms. the boiling point of water is higher than that of ammonia or hydrogen fluoride. In the case of ammonia, the amount of hydrogen bonding is limited by the fact that each nitrogen only has one lone pair. In a group of ammonia molecules, there are not enough lone pairs to go around to satisfy all the hydrogens. In hydrogen fluoride, the problem is a shortage of hydrogens. In water, two hydrogen bonds and two lone pairs allow formation of hydrogen bond interactions in a lattice of water molecules. Water is thus considered an ideal hydrogen bonded system.
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Charged particles from the Sun follow Earth’s magnetic field to the poles where they create the _______________.
Answers
im guessing the Aurora Borealis
3. the direction in which the proteins migrate (ie, toward anode or cathode) during electrophoretic separation of serum proteins, at ph 8.6, is determined by:
Answers
The direction in which the proteins migrate during electrophoretic separation of serum proteins at pH 8.6 is determined by their net charge.
The migration of proteins during electrophoresis is determined by their net charge, which is influenced by the pH of the surrounding medium. At pH 8.6, which is relatively alkaline, the proteins in serum typically carry a net negative charge.
In an electric field, proteins with a net negative charge will migrate towards the positively charged electrode (anode) because oppositely charged particles are attracted to each other.
Therefore, in electrophoretic separation of serum proteins at pH 8.6, the proteins will migrate towards the anode, moving in the direction opposite to the migration of the negatively charged ions present in the buffer solution.
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Using the information from Exercise 3.2.8 with D= disease, D C
= no disease, P= positive test result, and P C
= negative test result: what is Pr{D C
} ? 0.06 0.10 0.94 0.90
Answers
Pr{D C} = 0.94
The probability Pr{D C} represents the probability of not having the disease. In this case, the given information from Exercise 3.2.8 includes D (disease), D C (no disease), P (positive test result), and P C (negative test result). To find Pr{D C}, we need to consider the given probabilities.
The probability of having the disease, Pr{D}, is not explicitly given in the question. However, we can infer it by considering the complement of Pr{D C}. Since Pr{D C} represents the probability of not having the disease, the complement of Pr{D C} would represent the probability of having the disease.
Therefore, Pr{D} = 1 - Pr{D C}
Given that Pr{D C} = 0.06, we can calculate Pr{D} as follows:
Pr{D} = 1 - Pr{D C}
Pr{D} = 1 - 0.06
Pr{D} = 0.94
Hence, the probability of not having the disease (Pr{D C}) is 0.94.
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Which statement accurately describes a type of potential energy found in a container full of a chemical substance in liquid form?
The rotation of the particles is one place where potential energy is stored.
The vibration of the atoms in molecules is one place where potential energy is stored.
The speed of the particles is one place where potential energy is stored.
The bonds between atoms are one place where potential energy is stored.
Answers
Among the options provided, the statement that accurately describes a type of potential energy found in a container full of a chemical substance in liquid form is: "The bonds between atoms are one place where potential energy is stored."
In a container filled with a chemical substance in liquid form, the potential energy is primarily stored in the bonds between atoms within the molecules of the substance. These bonds are formed by the sharing or transferring of electrons between atoms, creating a stable arrangement. The potential energy arises from the electrostatic interactions between the charged particles involved in these chemical bonds.When the liquid substance is in its equilibrium state, the potential energy stored in the bonds represents the energy required to break these bonds and separate the atoms, transforming the substance into a different state (such as a gas or a solid).
This potential energy is released when the substance undergoes a chemical reaction or when external forces act upon it.While other forms of potential energy can also exist in a liquid substance, such as kinetic energy due to the speed of the particles or vibrational energy of the atoms within the molecules, these are generally associated with other types of energy rather than potential energy.
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How does the following equation demonstrate the law of conservation of mass? 22 + 2 → 22
A. The number of atoms of each element is the same on the reactant side as the product side.
B. The number of atoms on the reactant side is more than the number of atoms on the product side.
C. The number of water molecules is the same on the reactant and product side.
D. The number of atoms on the reactant side is less than the number of atoms on product side.
Answers
Answer:
A. The number of atoms of each element is the same on the reactant side as the product side.
Explanation:
The equation demonstrates the law of conservation of mass in such a way that the number of atoms of each element is the same on the reactant side as the product side.
According to the law of conservation of mass "matter is neither created nor destroyed in a chemical reaction but they are changed from one form to another".
By virtue of this, the number of moles of atoms on both sides of the expression must be the same.how many bonded atoms in carbon monoxide? how many lone pairs in carbon monoxide?
Answers
Answer:
there are 3 bonded atoms in carbon monoxide and a total of 6 electrons
Answer: There are a total of two bonded atoms in carbon monoxide: one carbon atom and one oxygen atom. There are no lone pairs in carbon monoxide.
Explanation: Carbon monoxide, or CO, is a chemical compound made up of one carbon atom bonded to one oxygen atom. The molecule has a linear shape, with the carbon atom at one end and the oxygen atom at the other end. There are a total of two bonded atoms in carbon monoxide: one carbon atom and one oxygen atom.
In terms of lone pairs, or non-bonding electrons, carbon monoxide has none. Lone pairs are pairs of electrons that are not involved in bonding, and they are typically found in the outermost electron shell of an atom. In carbon monoxide, all of the electrons are either bonded to the other atom in the molecule or are involved in bonding to that atom. Therefore, there are no lone pairs in carbon monoxide.
How many moles of carbon dioxide, CO2, can be formed by the decomposition of 10 moles of aluminum carbonate, Al2(CO3)?
Answers
Answer:
30 moles of CO₂
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
Al₂(CO₃)₃ —> Al₂O₃ + 3CO₂
From the balanced equation above,
1 mole of Al₂(CO₃)₃ decomposed to produce 3 moles of CO₂.
Finally, we shall determine the number of mole of CO₂ produced from the decomposition of 10 moles of Al₂(CO₃)₃. This can be obtained as follow:
From the balanced equation above,
1 mole of Al₂(CO₃)₃ decomposed to produce 3 moles of CO₂.
Therefore, 10 moles of Al₂(CO₃)₃ will decompose to produce = 3 × 10 = 30 moles of CO₂.
Thus, 30 moles of CO₂ were obtained from the reaction.
30 moles of CO₂ will be produced by the decomposition of 10 moles of \(\rm Al_2(CO_3)_3\).
What is carbon dioxide?Carbon dioxide is a gas made up of two elements, carbon, and oxygen.
It is the gas that is used by plants to make their food.
The % of this gas on Earth is 0.03%
The balanced equation is
\(\rm Al_2(CO_3)_3 \longrightarrow Al_2O_3 + 3CO_2\)
1 mole of \(\rm Al_2(CO_3)_3\) decomposes to produce 3 moles of CO₂.
If 1 mole of \(\rm Al_2(CO_3)_3\) produce 3 moles of CO₂, then decomposition of 10 moles of \(\rm Al_2(CO_3)_3\) will produce
3 × 10 = 30 moles of CO₂.
Thus, 30 moles of CO₂ will be produced by the decomposition of 10 moles of \(\rm Al_2(CO_3)_3\).
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Relative Strengths of oxyacids and Amines < 9 of 11 > Bases act as hydrogen ion acceptors because of the unshared electron pairs in their structure. Any group present in a base that withdraws electrons makes these electron pairs less available to accept a hydrogen ion. In contrast, any group that can act as an electron donating group such as hydrocarbon groups (usually represented as R) can increase the base strength. Thus, the addition of electronegative atoms or groups of atoms to the structure of a base decreases the base strength and electron donating groups increase base strength. Many common weak bases are derivatives of ammonia, in which H atom(s) of NH3 are replaced with other groups. Part B Arrange the following amines in order of decreasing base strength. Rank from strongest to weakest base. To rank items as equivalent, overlap them. View Available Hint(s) Reset Help NH3 (CH3)2NH CH3NH, NH,Br Strongest base Weakest base The correct ranking cannot be determined. Submit Previous Answers Request Answer
Answers
To rank the following amines in order of decreasing base strength: NH₃ > (CH₃)₂NH > CH₃NH₂ > NH₂Br.
The order of base strength is determined by the availability of the lone pair of electrons on the nitrogen atom, which can be donated to form a bond with a proton (H⁺).
NH3 has the highest base strength because it has the most electron-donating groups (three hydrogens) attached to the nitrogen atom, making the lone pair of electrons more available.
(CH₃)₂NH is the next strongest base because it also has two electron-donating methyl groups attached to the nitrogen atom.
CH₃NH₂ has only one electron-donating methyl group, so it is weaker than (CH₃)₂NH.
NH₂Br is the weakest base because the electronegative bromine atom withdraws electron density from the nitrogen atom, making the lone pair of electrons less available.
Therefore, the correct ranking from strongest to weakest base is:
NH₃ > (CH₃)₂NH > CH₃NH₂ > NH₂Br.
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Question 1 (1 point)
If PV = nRT, then if I increase the amount of moles of a gas in a glass jar,
and the temperature of the gas stays the same,
and volume of a jar obviously stays the same,
what will happen to pressure inside the jar?
Answers
Answer:
The pressure also increases.
Explanation:
As we can see in this equation,
Pressure is directly proportional to the moles of a gas in the glass jar.
Temperature and Volume remains constant.
Hence, if number of moles of a gas increases, the pressure also increase "n" number of times.
what appearance of an acidic analyte solution containing phenolphthalein indicates the endpoint of titration with a basic solution? select one: a burst of pink color that disappears upon stirring. a persistent dark pink color throughout the solution. a persistent pale pink color throughout the solution. a burst of pink color that darkens upon stirring.
Answers
Phenolphtalein is chosen because it changes color in a pH range between 8.3 - 10. It will appear pink in basic solutions and clear in acidic solutions.
What is Titration ?A titration is a method where the concentration of an unknown solution is ascertained by comparing it to a solution of known concentration. The analyte (the unknown solution) is typically added in a known amount to the titrant (the known solution) from a buret until the reaction is finished.
When dissolved in acidic or basic liquids, phenolphthalein is colourless. As a result, at the equivalence point of this titration, it ought to turn from colourless to purple. The endpoint denotes our best guess as to the location of the equivalence point.Titration is a typical analytical chemistry method for figuring out a solution's concentration by progressively adding a solution with a known concentration.Learn more about Titration here:
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In a titration experiment 34.7 mL of a 0.145M solution of barium hydroxide [Ba(OH)2] is added to
20mL of hydrochloric acid (HCI) of unknown concentration until the equivalence point is reached.
What is a) the molarity of the acid? and b) How many grams of HIC are in the solution?
Answers
To determine the molarity of the hydrochloric acid (HCl) and the number of grams of HCl in the solution, we can use the principles of stoichiometry and the balanced chemical equation for the reaction between barium hydroxide (Ba(OH)2) and hydrochloric acid (HCl):
Ba(OH)2 + 2HCl → BaCl2 + 2H2O
a) Molarity of the acid (HCl):
From the balanced equation, we can see that one mole of Ba(OH)2 reacts with two moles of HCl. Therefore, the moles of HCl can be calculated as follows:
Moles of HCl = Moles of Ba(OH)2 = Molarity of Ba(OH)2 × Volume of Ba(OH)2 solution in liters
Moles of HCl = 0.145 M × (34.7 mL / 1000 mL/L) = 0.00504 moles
Since the volume of HCl is not specified, we cannot directly calculate the molarity of the acid. We need additional information, such as the volume of HCl used or the balanced equation stoichiometry.
b) Grams of HCl:
To calculate the grams of HCl, we need the molar mass of HCl. The molar mass of HCl is approximately 36.46 g/mol.
Grams of HCl = Moles of HCl × Molar mass of HCl
Grams of HCl = 0.00504 moles × 36.46 g/mol = 0.184 grams
Therefore,
a) The molarity of the hydrochloric acid (HCl) is not provided in the given information. Additional information is needed to calculate it.
b) The solution contains approximately 0.184 grams of HCl.
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1. A newspaper article wrote about a study in which researchers subjected laboratory gloves to stress. Among 240 vinyl gloves, 63% leaked. Among 240 latex gloves, 7% leaked. Calculate the claim that vinyl gloves have a higher leak rate than latex gloves. Use 0.005 significance level.
Answers
The claim that vinyl gloves have a higher leak rate than latex gloves is supported by the study at a significance level of 0.005.
To determine if vinyl gloves have a higher leak rate than latex gloves, we can conduct a hypothesis test.
The z-value is calculated as:
z = (p₁ - p₂) / √((p₁(1 - p₁) / n₁) + (p₂(1 - p₂) / n₂))
where p₁ and p₂ are the sample proportions, and n₁ and n₂ are the sample sizes.
Certainly! Let's calculate the z-value to determine if vinyl gloves have a higher leak rate than latex gloves.
For vinyl gloves:
Sample size (n₁) = 240
Leaking gloves (x₁) = 0.63 * 240 = 151.2 (approximated to 151)
For latex gloves:
Sample size (n₂) = 240
Leaking gloves (x₂) = 0.07 * 240 = 16.8 (approximated to 17)
We will calculate the z-value using the formula:
z = (p₁ - p₂) / √((p₁(1 - p₁) / n₁) + (p₂(1 - p₂) / n₂))
where p₁ and p₂ are the sample proportions.
p₁ = x₁ / n₁ = 151 / 240 ≈ 0.629
p₂ = x₂ / n₂ = 17 / 240 ≈ 0.071
Calculating the z-value:
z = (0.629 - 0.071) / √((0.629 * (1 - 0.629) / 240) + (0.071 * (1 - 0.071) / 240))
z ≈ 13.239
The calculated z-value is approximately 13.239. To determine if the claim is supported, we compare this value to the critical z-value for a one-tailed test at a significance level of 0.005.
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When an excited electron spontaneously emits a photon, which energy transformation takes place
Answers
Given what we know, we can confirm that when an excited electron spontaneously emits a photon, the energy released is electromagnetic energy.
What is a Photon and what energy does it release when being emitted?A photon is a particle. This means that it is one of the smallest forms of matter that we can study. Photons form electromagnetic fields. Therefore, when being emitted by an electron, photons release electromagnetic energy.Therefore, we can confirm that when an excited electron spontaneously emits a photon, the energy released is electromagnetic energy due to the properties of the photon being emitted.
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When an excited electron spontaneously emits a photon, the energy transformation from potential to kinetic energy takes place.
If an atom is in an excited state means full of energy, it goes from higher energy level to lower energy level. The electron releasing energy in the form of a photon, which is emitted in a random direction.
When the electron returns to a low energy state, it releases the potential energy in the form of kinetic energy so we can conclude that the energy transformation from potential to kinetic energy takes place.
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When acid is added to pure water, the ph ___________, and when base is added to pure water, the ph ___________.
Answers
When acid is added to pure water, the pH increases, and when base is added to pure water, the pH decreases.
A pH scale is the scale that is used to determine the amount of acidic or basic behavior in an aqueous solution. The pH scale is expressed as negative of the concentration of H⁺ or Hydronium ions. The scale has numeric values from 0 to 14. The solution having a value of 0 to 6 on pH scale will be acidic and solution having value of 8 to 14 will be basic in nature. The solution having value equal to 7 will be neutral. Whenever in an acidic or basic solution water is added, it becomes diluted solution. Adding water in an acidic solution makes the solution loose its acidic nature and moves towards basic nature that is pH increases and adding water in basic solution makes solution loose its basic nature and move towards acidic nature that is pH decreases.
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The chemical attraction between two amino acids forms a(an)
a. peptide bond.
b. partially hydrogenated protein.
c. emulsified polypeptide.
d. fatty acid chain.
Answers
The chemical attraction between two amino acids forms a peptide bond. A peptide bond is formed by a chemical attraction between the amine group of one amino acid and the carboxyl group of another amino acid. Peptide bonds are formed during the process of protein synthesis, which is the process by which cells produce proteins.
There are 20 different amino acids that can be used to form proteins, and they all have a similar structure consisting of a central carbon atom, an amino group, a carboxyl group, and a side chain. The side chain is different for each amino acid, and it determines the properties of the amino acid and the protein it forms.
When two amino acids are joined together by a peptide bond, a dipeptide is formed. When multiple amino acids are joined together, a polypeptide chain is formed. Polypeptide chains can fold and interact with each other to form proteins with specific structures and functions.
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Fill in the nuclear equation:
I don’t understand how to do it when there’s two elements on both sides.
Answers
Answer:
¹₀P
Explanation:
Nuclear reaction:
⁹₄Be + ⁴₂He → ¹²₆C + ?
To balance this equation, as with other combining specie, the mass number on both sides of the expression must be the same. Also, the atomic number must be the same.
Let us represent the unknown by X;
⁹₄Be + ⁴₂He → ¹²₆C + ᵇₐX
Now;
Sum of mass number;
9 + 4 = 12 + b
13 = 12 + b
b = 1
Sum of atomic number;
4 + 2 = 6 + a
a = 0
So the specie is a position ¹₀P
Why are feedback loops a way to see what direction our planet may be heading and how to prevent harmful changes?
Answers
The following is the reason why are feedback loops a way to see what direction our planet may be heading and how to prevent harmful changes.
What is a feedback loop?
A feedback loop is what accelerates or decelerates the trend. Our planetary system has many feedback loops to understand which direction the Earth is moving, including environmental feedback, climate feedback, and warming feedback. You can take the necessary steps to control it and see the results through a feedback loop. This will prevent harmful changes.
There are two types of loops. Positive feedback accelerates environmental deterioration, negative feedback means environmental deterioration. Global warming is a current trend in today's world where positive feedback is running, meaning that warming is increasing. Understanding feedback can help us know the direction of the planet. can.
Positive feedback means that global warming is progressing, environmental degradation is progressing, etc. Negative feedback means that global warming is decreasing and the environment is increasing.Hence, You can prevent disasters by knowing the trend of increase and decrease. If the warming progresses, we can take the necessary steps to control it and see the results through a feedback loop. This will prevent harmful changes.
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A piece of lead loses 78. 00 J of heat and experiences a decrease in temperature of 9 oC. What is the mass of the piece of lead? The specific heat of lead is 0. 130 J/goC
Answers
To determine the mass of the piece of lead, we can use the formula q = m х c х ΔT Where q is the heat energy, m is the mass, c is the specific heat capacity, and ΔT is the change in temperature.
Given:
q = -78.00 J (negative sign indicates heat loss)
ΔT = -9 °C (negative sign indicates decrease in temperature)
c = 0.130 J/goC (specific heat capacity of lead)
Plugging in the values into the formula:
-78.00 J = m * (0.130 J/goC) * (-9 oC)
Simplifying:
-78.00 J = -1.17 m
Dividing both sides by -1.17:
m = 78.00 J / 1.17 = 66.67 g
Therefore, the mass of the piece of lead is approximately 66.67 grams.
The specific heat capacity (c) represents the amount of heat energy required to raise the temperature of one gram of a substance by one degree Celsius. In this case, the specific heat capacity of lead is given as 0.130 J/goC. By using this value and the equation above, we can calculate the mass of the lead piece based on the given heat loss and temperature change.
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Sabiendo el número atómico del titanio y además que su número másico es 48, ¿cuál es la cantidad de protones, neutrones y electrones respectivamente? *
Answers
Answer:
# protones: 22
# neutrones: 26
# electrones: 22
Explanation:
El número atómico del titanio es 22. Este número atómico representa la cantidad de protones del átomo en cuestión. Así:
# protones: 22.
El número másico se define como la suma de protones y neutrones, así:
48 = 22 + # neutrones
26 = # neutrones
Un átomo es neutro, esto quiere decir que sus cargas positivas y negativas son iguales (Protones: cargas positivas; Electrones: Cargas negativas).
Así, el # protones = # electrones = 22
both magnesium and calcium react with water. Which element would you expect to react more vigorously? Provide an explanation for your answer
Answers
Both calcium and magnesium reacts with water form their corresponding hydroxides along with the evolution of hydrogen gas. Calcium forms calcium hydroxide whereas magnesium forms magnesium hydroxide with water. But calcium reacts more violently with water.
The reactivity of metals depends on their capacity to lose electrons. The nucleus of calcium is farther away from the valence electrons and thus exert a smaller electrostatic pull on those electrons than the nucleus of magnesium.
Reactivity depends on ability to lose electrons. So calcium can lose electrons more easily and hence it is more reactive.
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1. In sheep, a gene with two alleles decides wool color. The allele for white wool is
dominant to the allele for black wool. If two heterozygous sheep mate, what
percentage of the sheep will have white wool? Record your answer as a
percent.
White wool
Black wool
HINT: Create a Punnett square on scratch paper to determine the answer.
Answers
This is defined as a variant form of a gene. We were told that allele for white wool is dominant to the allele for black wool and two heterozygous sheep mated.
When we cross Ww and Ww we get WW, Ww, Ww, ww. Since white is dominant then the percentage is 3/4 = 75 percent.
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A 4.80-gram piece of magnesium displaces 2.76 mL of water when it is placed in a graduated cylinder. What is the density of magnesium?
Answers
Answer:
1.73913043g/mL
Explanation:
Density is how much a substance would weigh per 1 mL of the substance. So it is measured by dividing weight (g) by volume (mL).
4.80g/2.76mL = 1.73913043g/mL
How many joules are require to raise the temperature of 220. g of Leads .pb = 0.130 joules /g.C )from 42.0°C to 72.0 °C? O 858 O 3.90 j O 76.0 j O 65.73
Answers
The answer is 858 joules, which is the amount of energy required to raise the temperature of 220 g of lead from 42.0°C to 72.0°C.
To calculate the joules required to raise the temperature of 220 g of lead from 42.0°C to 72.0°C, we can use the formula Q = m x C x ∆T, where Q is the amount of heat energy required, m is the mass of the substance, C is the specific heat capacity of the substance, and ∆T is the change in temperature.
Substituting the values given in the question, we get:
Q = 220 g x 0.130 joules/g.C x (72.0°C - 42.0°C)
Q = 220 g x 0.130 joules/g.C x 30.0°C
Q = 858 joules
Therefore, the answer is 858 joules, which is the amount of energy required to raise the temperature of 220 g of lead from 42.0°C to 72.0°C.
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outline the sequence of steps needed to solve a typical stoichiometric problem
Answers
A typical stoichiometric problem involves writing the balanced chemical equation, identifying the known and unknown quantities, using stoichiometry to convert the known quantities to the required units for the unknown quantity, and calculating the unknown quantity based on the stoichiometric coefficients.
A stoichiometric problem involves calculating the amount of reactants and products involved in a chemical reaction. To solve a typical stoichiometric problem, the following sequence of steps is generally required:
1. Write the balanced chemical equation for the reaction.
2. Identify the known quantities, which may be given in units of mass, moles, or volume.
3. Determine the unknown quantity that needs to be calculated.
4. Use stoichiometry to convert the known quantities to the required units for the unknown quantity.
5. Calculate the amount of the unknown quantity based on the stoichiometric coefficients in the balanced equation.
6. Check the answer for accuracy and consistency with the laws of conservation of mass and energy.
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The standard heat of formation for NO2 is 33.2kJmol. How much energy is required to form 100.0 g of NO2 from its respective elements in kilojoules
Answers
The energy required to form 100.0 g of \(NO_2\) from its respective elements is approximately 72.12 kJ.
The standard heat of formation of a compound is the enthalpy change that occurs when one mole of the compound is formed from its constituent elements, with all reactants and products in their standard states at a specified temperature and pressure.
To calculate the energy required to form 100.0 g of \(NO_2\) from its respective elements, we need to first determine the number of moles of \(NO_2\) that corresponds to 100.0 g:
Molar mass of \(NO_2\) (nitrogen dioxide) = 46.0055 g/mol
Number of moles of \(NO_2\) = mass / molar mass = 100.0 g / 46.0055 g/mol = 2.1732 moles
The standard heat of formation for \(NO_2\) is 33.2 kJ/mol, which means that the formation of one mole of \(NO_2\) releases 33.2 kJ of energy. Therefore, the energy required to form 2.1732 moles of \(NO_2\) is:
Energy = (33.2 kJ/mol) x (2.1732 mol) = 72.12 kJ
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orbital diagram for phosphorus 3- ion
Answers
The orbital diagram of the P^3- anion is shown in the orbital diagram attached.
What is orbital diagram?An orbital diagram is a visual representation of where electrons are located within an atom or ion. A series of boxes or circles is used to symbolize an atomic orbital, which is the region of space around the nucleus where electrons are most likely to be found.
Each box or circle, which stands for an atomic orbital, has an image of an electron inside it, represented by an arrow.
Orbital diagrams can be used to visualize and understand the electronic structure of atoms and ions, as well as to predict their chemical and physical properties.
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The half-life of hafnium-156 is 0.025 s. How long will it take a 560 g sample to decay to 35 g?
Answers
Answer:
0.1 seconds
Explanation:
s=seconds
Decay by a half-life is exponential since you're taking away half of the previous life every time. The reduction in hafnium is not constant. You don't take away the same amount of hafnium from the existing hafnium every 0.025 s since the reduction in hafnium decreases by half. Every 0.025 s, you take away half of what you've taken in the previous 0.025 s.
560/35 = 16
Half-life means 1/2 of the previous life of hafnium when time forwards 0.025 s. However, if you go back 0.025 s in time, you double the life by 2.
2^x = 16 ==> solve for x
x = 4 ==> 2^4 = 16
Now multiply 4 and 0.025 to get the total time:
4 * 0.025 = 0.100 ==> 0.1 seconds
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what percentage of water on earth is fresh water
Answers
Answer:
only 2.5% is fresh water on earth
Answer:
The answer is 3%
Explanation: