N2(
g. 3h2(
g. 2nh3(
g., what will happen if more nitrogen gas is added?
electrons in the first energy level of an atom
(A) have no energy
(B) have the lowest possible energy
(C) have the highest possible energy
(D) are in an excited state
(E) are in an unstable state
Electrons in the first energy level of an atom have the lowest possible energy, known as the ground state, which is the most stable configuration before any additional energy is introduced. Option B is correct.
Electrons in the first energy level of an atom have the lowest possible energy. This state is known as the ground state, which is the most stable configuration for an atom. Electrons in this lowest energy orbit maintain minimal energy before any external energy is introduced.
If the atom receives energy from an outside source, electrons may absorb this energy and transition to a higher energy level, or excited state, which is less stable. Upon returning to the ground state, the atom releases energy, often in the form of electromagnetic radiation such as light. This fundamental behavior is attributed to the quantized nature of electron energy levels, as described by quantum mechanics.
Hence, B. is the correct option.
Which of the following is the best definition of baryonic material?
A. form of hypothetical energy that makes up most of the universe
B. type of matter that we cannot see but that we believe makes up more than 20% of the universe C. matter made of ordinary atoms, such as hydrogen or helium atoms ...?
if an atom has a mass of 15 and an atomic number of 9. How many neutrons are in the atoms?
Describe observations that led to the Bohr and quantum models of the atom.
Explain how line spectra are used to identify elements and what they indicate about atoms.
Why is the half life of a radioactive substance independent of the initial amount of the substance that is present
Please help with word equations?
Solid Silver carbonate decomposes into solid silver oxide and gaseous carbon dioxide when heated.
Adding chlorine gas to a solution of potassium iodide gives solid iodine and a solution of potassium chloride.
Iodine crystals react with chlorine gas to form iodine trichloride.
The word equation represented as a chemical equation is as follows:
Ag₂CO₃ → Ag₂O + C0₂
Cl₂ + 2KI → I₂ + 2KCl
I₂ + 3Cl₂ → 2 ICl₃
The word equation can be converted to chemical equation as follows:
Solid Silver carbonate decomposes into solid silver oxide and gaseous carbon dioxide when heated. Therefore,
Chemical Equation:Ag₂CO₃ → Ag₂O + C0₂Adding chlorine gas to a solution of potassium iodide gives solid iodine and a solution of potassium chloride. Therefore,
Chemical equationCl₂ + KI → I₂ + KClIodine crystals react with chlorine gas to form iodine trichloride. Therefore,
Chemical equationI₂ + Cl₂ → ICl₃learn more on word equation here:https://brainly.com/question/3388761
The word equations for the given reactions involve the decomposition of silver carbonate, the reaction between chlorine gas and potassium iodide, and the synthesis of iodine trichloride.
Word Equations for Chemical Reactions
Let's go through the word equations provided:
Solid Silver carbonate decomposes into solid silver oxide and gaseous carbon dioxide when heated:
Ag₂CO₃ (s) → Ag₂O (s) + CO₂ (g)Adding chlorine gas to a solution of potassium iodide gives solid iodine and a solution of potassium chloride:
Cl₂ (g) + 2KI (aq) → I₂ (s) + 2KCl (aq)Iodine crystals react with chlorine gas to form iodine trichloride:
I₂ (s) + 3Cl₂ (g) → 2ICl₃ (s)In a reaction to produce sulfuric acid, the theoretical yield is 300.g. What is the percent yield if the actual yield is 280.g?
In a reaction to produce sulfuric acid with a theoretical yield of 300.g and an actual yield of 280.g, the percent yield is 93.33%.
Percent Yield Calculation:
Calculate the percent yield using the formula: Percent Yield = (Actual Yield / Theoretical Yield) x 100%Substitute the values: (280.g / 300.g) x 100% = 93.33%The percent yield is 93.33%.
Help Pleaseee!
A laboratory has a 3.0 mol sample of pure carbon and a 3.0 mol sample of pure helium. How many more grams of carbon do they have than grams of helium?
Answer Choices:
The carbon sample would have the same mass as the helium sample.
The carbon sample would have two times the mass of the helium sample.
The carbon sample would have three times the mass of the helium sample.
The carbon sample would have six times the mass of the helium sample.
Answer:
The correct answer is; 'The carbon sample would have three times the mass of the helium sample'.
Explanation:
Number of moles of carbon = 3.0 moles
Mass of 3 moles of carbon ,m= [tex]3 moles\times 12 g/mol = 36 g[/tex]
Number of moles of helium = 3.0 moles
Mass of 3 moles of helium,m' = [tex]3 moles\times 4 g/mol = 12 g[/tex]
Grams of carbon do we have more than grams of helium:
Mass of carbon > Mass of helium
[tex]\frac{m}{m'}=\frac{36 g}{12 g}=3[/tex]
m = 3m'
The carbon sample would have three times the mass of the helium sample
2N2H4 + N2O4 → 3N2 + 4H2O
How many grams of N2H4 will be consumed by 92 g of N2O4?
16 g
128 g
64 g
32 g
Answer : The amount of [tex]N_2H_4[/tex] will be, 64 g
Solution : Given,
Mass of [tex]N_2O_4[/tex] = 92 g
Molar mass of [tex]N_2O_4[/tex] = 92 g/mole
Molar mass of [tex]N_2H_4[/tex] = 32 g/mole
First we have to calculate the moles of [tex]N_2O_4[/tex].
[tex]\text{Moles of }N_2O_4=\frac{\text{Mass of }N_2O_4}{\text{Molar mass of }N_2O_4}=\frac{92g}{92g/mole}=1mole[/tex]
Now we have to calculate the moles of [tex]N_2H_4[/tex].
The balanced chemical reaction is,
[tex]2N_2H_4+N_2O_4\rightarrow 3N_2+4H_2O[/tex]
From the balanced reaction, we conclude that
1 mole of [tex]N_2O_4[/tex] react with 2 moles of [tex]N_2H_4[/tex]
and from the calculated moles,
1 mole of [tex]N_2O_4[/tex] react with 2 moles of [tex]N_2H_4[/tex]
Now we have to calculate the mass of [tex]N_2H_4[/tex]
[tex]\text{Mass of }N_2H_4=\text{Moles of }N_2H_4\times \text{Molar mass of }N_2H_4[/tex]
[tex]\text{Mass of }N_2H_4=(2mole)\times (32g/mole)=64g[/tex]
Therefore, the amount of [tex]N_2H_4[/tex] will be, 64 g
Chemical energy in burning wood is changed into thermal energy. The thermal energy is absorbed by water, which boils to produce steam. The thermal energy is changed into kinetic energy in the moving steam. The kinetic energy is used to turn a turbine, which converts the kinetic energy into electricity. Which sentence best describes this system?
A. It involves only energy transfer.
B. It involves only energy transformation.
C. It involves both energy transformation and energy transfer.
D. It does not involve either energy transformation or energy transfer.
This system describes, the involvement of both energy transformation and energy transfer. Hence option C is correct.
What is Energy transfer and Energy Transformation ?Energy transfer is nothing but the phenomenon of gaining or losing the amount of energy by a point from which we are taking or giving the energy. Energy transfer is the movement of energy from one point to other. for example, when we want to increase the temperature of the body from room temperature to certain temperature, then we have to transfer certain amount of energy to gain that temperature.
According to law of thermodynamic, energy neither be created nor be destroyed, it can be transferred from one form into another form. Energy transformation is when energy changes from one type to another. for example when mechanical energy gets converted into electric energy in generator, there is transformation of energy from mechanical to electric energy. Vice verse is true for electric fan.
In this system, everything is gaining temperature hence it is gaining energy, means there is transfer of energy. and first chemical energy is changed to thermal energy, thermal energy is transferred to kinetic energy and last into electric energy, hence there is of course transformation of energy from one form into another form.
Hence option C is Correct.
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How did the development of the earliest idea about atoms differ from the later work of scientists?
Final answer:
The earliest ideas about atoms were speculative and lacked scientific evidence, while the later work of scientists involved experimentation and observation.
Explanation:
The earliest recorded discussion of the basic structure of matter comes from ancient Greek philosophers, Leucippus and Democritus, who argued that all matter was composed of small, finite particles called atoms. They thought of atoms as moving particles that differed in shape and size and could join together. However, these early ideas about atoms were philosophical and were not backed by experimental evidence or scientific methods.
In contrast, the later work of scientists such as John Dalton, Amadeo Avogadro, and Dmitri Mendeleev involved rigorous experimentation and observation. Dalton introduced the concept of atomic theory, which proposed that atoms are indivisible and combine in specific ratios to form compounds. Avogadro's work on the relationship between the number of particles and the volume of gases contributed to the development of Avogadro's law. Mendeleev's periodic table of elements provided a systematic organization of elements based on their atomic properties.
Overall, while the earliest ideas about atoms were speculative and lacked scientific evidence, the later work of scientists involved experimentation and observation, leading to the development of atomic theories and our current understanding of atoms.
Final answer:
The earliest ideas about atoms by ancient philosophers were speculative and not based on experimentation. Later scientific work incorporated experimentation and more sophisticated tools, leading to a deeper understanding and concrete evidence of atomic structure, including the nuclear model, subatomic particles, and the periodic table.
Explanation:
The development of the earliest idea about atoms by ancient Greek philosophers such as Leucippus and Democritus was based on philosophical reasoning rather than empirical evidence, as they theorized matter to be made up of indivisible particles they called atomos. Centuries later, scientists like John Dalton, Amadeo Avogadro, Dmitri Mendeleev, and Ernest Rutherford built upon these early ideas, developing a more sophisticated understanding of atoms through systematic experimentation and observation. Their work made use of developing technologies to confirm the existence of atoms, leading to discoveries such as the nuclear model of the atom and the periodic table.
The early Greek concept held that matter could not be subdivided infinitely and proposed atoms as the smallest units, different in shape and size, and always in motion. Later scientific work, however, provided concrete evidence and expanded on these notions by finding atoms could indeed be split, revealing subatomic structures, conducting experiments to confirm their theories, and establishing a comprehensive organization of elements based on atomic weight and properties.
Which statement about crystal lattice energy is best supported by the information in the table?
A.The lattice energy increases as cations get smaller, as shown by LiF and KF.
B.The lattice energy increases as the charge of anions increases, as shown by LiF and LiCl.
C.The lattice energy decreases as anions get smaller, as shown by NaCl and NaF.
D.The lattice energy decreases as the charge of cations decreases, as shown by NaF and KF.
Answer:the answer is b
Explanation:got it right on ed
What coefficients must be added to balance the following equation?
_____NaOH + _____H2 SO4 _____ Na2SO4 + _____ H2O
2, 1, 1, 1
3, 1, 1, 3
2, 1, 1, 2
4, 2, 2, 1
...?
The answer is C 2,1,1,2
How was the work of Newlands similar to that of Mendeleev on the periodic table?
1.They both arranged the elements in order of increasing atomic mass.
2.They both arranged elements that had similar properties into groups.
3.They both predicted the positions of undiscovered elements on the table.
4.They both placed the relative atomic mass of each element on the table.
the application of scientific knowledge to benefit people is___. A. technology B. society C. ethics D. economics
What is the Lewis Dot Structure for C2H3? ...?
A box has a weight of 120 lbs and the bottom of the box is 12 in2 . What is the pressure the box exerts on the floor?
The box exerts a pressure of 10 pounds per square inch (lbs/in²) on the floor, calculated by dividing the weight of the box (120 lbs) by the area of its bottom (12 in²).
The pressure exerted by the box on the floor can be calculated using the formula for pressure, which is the force applied (in this case, the weight of the box) divided by the area over which the force is distributed.
The weight of the box is given as 120 lbs, and the area of the bottom of the box in contact with the floor is 12 in². To find the pressure, we divide the weight by the area:
Pressure = Weight / Area
Pressure = 120 lbs / 12 in² = 10 lbs/in²
Therefore, the box exerts a pressure of 10 pounds per square inch (lbs/in²) on the floor.
What country was overrun by the Japanese
if the density of iron is 7.8 g/cm3 and you find an iron nail weighing 15g, What iwould the volume of the nail be?
For the reaction shown, calculate how many grams of each product form when the following amounts of reactant completely react to form products. Assume that there is more than enough of the other reactant.
2Al(s)+Fe2O3(s)→Al2O3(s)+2Fe(l)
4.3 gAl
Using stoichiometry, we find that when 4.3 g of Al reacts, 8.14 g of Aluminium Oxide and 8.89 g of Iron are formed.
Explanation:To calculate the grams of products formed in a reaction, we use stoichiometry, which is based on the law of conservation of mass. Here, for every 2 moles of Al (Aluminium, 26.98 g/mol) reacted, 1 mole of Al2O3 (Aluminium oxide, 101.96 g/mol) and 2 moles of Fe (Iron, 55.85 g/mol) are formed.
To calculate the amount in grams of each product for 4.3 g of Al reacted, we first need to convert this amount into moles of Al by dividing by its molecular weight. Then we use the stoichiometry of the reaction to find the amount of product formed.
(4.3 g Al) * (1 mol Al / 26.98 g Al) = 0.159 moles Al
For Aluminium oxide: (0.159 mol Al) * (1 mol Al2O3 / 2 mol Al) * (101.96 g Al2O3 / 1 mol Al2O3) = 8.14 g Al2O3
For Iron: (0.159 mol Al) * (2 mol Fe / 2 mol Al) * (55.85 g Fe / 1 mol Fe) = 8.89 g Fe
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How is the number of unpaired valance electrons in an atom related to the number of bonds that the atom can form?
Which statement best relates the strength and concentration of a base? At high enough concentrations, a weak base becomes strong. Even at low concentrations, a strong base is strong. A weak base always has a low concentration. The stronger the base, the higher its concentration.
Answer: Option (b) is the correct answer.
Explanation:
When there are more number of hydroxide ions in a solution then there will be high concentration of [tex]OH^{-}[/tex] or hydroxide ions. As a result, more will be the strength of base in that particular solution.
A base is strong when it readily dissociate into its ions in the solution. When a base is strong, then it does not matter at what concentration it is dissolved in the solution because despite of its low concentration it will remain a strong base.
Thus, we can conclude that out of the given options, the statement even at low concentrations, a strong base is strong best relates the strength and concentration of a base.
If every oxygen ion (combined with an aluminum ion) has a charge of –2, what must the charge of each aluminum ion be? How can you tell this? Also, what has to happen to an uncharged aluminum atom so that it will bond with oxygen?
The formula K₂S indicates that _______.
what is the mass of 9.30 moles of SiH4 ?
Answer:
298.716 g of [tex]SiH_{4}[/tex]
Explanation:
[tex]SiH_{4}[/tex] is a molecule with one atom of Si and four atoms of H.
First you should calculate the molar mass of each atom:
Molar mass of Si = 28.0855
Molar mass of H = 1.00784
So, the molar mass of the [tex]SiH_{4}[/tex] will be:
Molar mass of [tex]SiH_{4}[/tex] = 28.0855 + (1.00784 x 4)
Molar mass of [tex]SiH_{4}[/tex] = [tex]32.12\frac{g}{mol}[/tex]
it means that one mol of [tex]SiH_{4}[/tex] has a molar mass of [tex]32.12\frac{g}{mol}[/tex].
Now you can calulate the mass:
[tex]9.30molesSiH_{4}*\frac{32.12gSiH_{4}}{1molSiH_{4}}[/tex] = 298.716 g of [tex]SiH_{4}[/tex]
Question 7.7. All amino acids have a central carbon with four components attached to it. One of these components is called the R-group. Which of the following best describes the R-group? (Points : 3)
The R-group helps the amino acid replicate.
The R-group gives the amino acid unique characteristics.
The R-group is the same in all amino acids.
The R-group is what stabilizes the amino acid.
Answer:
All amino acids have a central carbon with four components attached to it. One of these components is called the R group.
Which statement best describes the R group?
The R group stabilizes the amino acid.
The R group is the same in all amino acids.
The R group helps the amino acid replicate.
The R group gives the amino acid unique characteristics.
Explanation:
Final answer:
The R-group, or side chain, is what gives each amino acid its unique characteristics by varying in size, polarity, and pH, thus affecting amino acid interactions and functions.
Explanation:
All amino acids have a central asymmetric carbon, also known as the α carbon, to which four different components are attached: an amino group (NH2), a carboxyl group (COOH), a hydrogen atom (H), and a variable R-group or side chain. The R-group is essential in determining the unique characteristics of each amino acid. With the exception of glycine, where the R-group is just a hydrogen atom, the R-groups vary among amino acids, affecting their size, polarity, and pH, which in turn dictate how the amino acids interact with each other and their environment.
Therefore, the correct description of the R-group is that it gives the amino acid unique characteristics; the R-group is not involved in replication, nor is it the same in all amino acids, nor does it solely stabilize the amino acid.
Mass is the ________(1)________, where as depth is the ________(2)________
A 30.0-mL sample of 0.165 M propanoic acid is titrated with 0.300 M KOH.
1. Calculate the pH at 5 mL of added base.
2. Calculate the pH at one-half of the equivalence point. (Equivalence point is 8.96)
3. Calculate the pH at 20 mL of added base.
Answer:
1) pH = 4.51
2) pH = 4.87.
3) pH = 12.32
Explanation:
1) the Ka of propanoic acid is 1.34 X 10⁻⁵
Therefore pKa = 4.87
When we add 5 mL of 0.300 M NaOH the moles of base added is
moles = molarity X volume
moles = 0.300 X 5mL = 1.5 mmoles
moles of acid present = molarity X volume = 0.165 X 30.0 = 4.95 mmoles
on addition of 1.5 mmoles of base the moles of acid neutralized = 1.5mmole
This will result in formation of salt of the acid
the moles of salt formed = 1.5 mmoles
the moles of acid left = 4.95 - 1.5 = 3.45 mmol
this acid and its salt mixture results in formation of a buffer
the pH of buffer is calculated as:
pH = pKa + log [salt] / [acid]
pH = 4.87 + log [1.5/3.45] = 4.51
2) at half equivalence point the moles of acid becomes equal to moles of salt formed thus the pH of solution will become equal to the pKa of acid
pH = 4.87.
3) the moles of based added due to addition of 20.0 mL = molarity X volume
moles = 0.300 X 20 = 6mmol
This will completely neutralize the acid (4.95 mmol)
after neutralization the moles of base left = 6-4.95 = 1.05 mmol
Total volume of solution = volume of acid + volume of base =30+20=50
concentration of hydroxide ion (due to excess base) = [tex]\frac{mmoles}{volume(mL)}[/tex]
[OH⁻]=0.021
pOH = -log[OH⁻]=1.68
pH = 14-pOH = 12.32
The titration results in the neutralization reaction with the addition of acid to the base. The pH with the addition of 5 ml of the base is 4.51. The pH at half equivalence is 4.87. The pH with 20 mL base is 12.32.
What is pH?The pH can be defined as the concentration of hydrogen ions in the solution.
The moles of acid in the solution is:
[tex]\rm Moles=Molarity\;\times\;Volume(L)[/tex]
Moles of propionic acid are:[tex]\rm Moles\;propionic \;acid=0.165\;\times\;0.03\;L\\Moles\;propionic\;acid=4.95\;mmoles[/tex]
The moles of base, KOH in 5 mL will be:
[tex]\rm Moles\;KOH=0.3\;M\;\times\;0.0005\;L\\Moles\;KOH=1.5\;mmoles[/tex]
The moles of acid left after neutralization is:
[tex]\rm Moles\;acid\;left=4.95-1.15\;mmoles\\Moles\;acid\;left=3.45\;mmoles[/tex]
The pH of the solution can be given as:
[tex]\rm pH =pKa+log\dfrac{salt}{acid}\\ pH=4.87+log\dfrac{1.5}{3.45}\\pH=4.51[/tex]
The pH of the solution after the addition of 5 ml base is 4.51.The pH at half equivalence point will be equivalent to the pKa, as the moles of salt is equivalent to the moles of acid.
Thus, the pH at the half equivalence point is 4.87.
The pH after the addition of 20 mL base is given as:The moles of base added is:
[tex]\rm Moles\;KOH=0.3\;M\;\times\;0.02\;L\\Moles\;KOH=6\;mmol[/tex]
The acid will be completely neutralized with the formation of 4.95 mmol of salt. The base left in the reaction will be:
[tex]\rm Moles\;KOH\;left=6\;mmol-4.95\;mmol\\Moles\;KOH\;left=1.05\;mmol[/tex]
The final volume of the solution will be 50 mL. The molarity of the KOH in the solution will be:
[tex]\rm Molariy\;OH^-=\dfrac{mmoles}{volume}\\ Molarity\;OH^-=\dfrac{1.05}{50} \\Molarity\;OH^-=0.021[/tex]
The pOH of the solution is given as:
[tex]\rm pOH=-log[OH^-]\\pOH=-log(0.021)\\pOH=1.68[/tex]
The pH of the solution will be:
[tex]\rm pH=14-pOH\\pH=14-1.68\\pH=12.32[/tex]
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What are the components of adenosine triphosphate (ATP)?
sugar + three phosphates
adenosine + one phosphate
base + three phosphates
base + sugar + three phosphates
Answer:
ATP = Adenine + Ribose sugar + Triphosphates
Explanation:
Adenosine tri phosphate is made up of adenine , ribose sugar and three phosphate which is soluble in water and has a high energy content. Energy is produced by breaking bonds between phosphates.
Then answer is = Base+Sugar+Three phosphates.