Answer:
[tex]\boxed{\text{-8.5 mV}}[/tex]
Explanation:
The SHE is not under standard conditions, so we must use the Nernst Equation, which relates the cell potential to the standard potential and to the activities of the electroactive species.
[tex]E = E^{\circ} - \frac{RT}{zF}lnQ[/tex]
Step 1. Write the equation for the cell reaction
Anode: H₂(1 atm) ⇌ 2H⁺(1 mol·L⁻¹) + 2e⁻
Cathode: 2H⁺(0.88 mol·L⁻¹) + 2e⁻ ⇌ H₂(1.7 atm)
Overall: H₂(1 atm) + 2H⁺(0.88 mol·L⁻¹) ⇌ 2H⁺(1 mol·L⁻¹) + H₂(1.7 atm)
Step 2. Calculate Q
[tex]Q = \frac{1 \times 1.7 }{ 1 \times 0.88} = 1.93[/tex]
Step 3. Apply the Nernst equation
Data:
E° = 0 V
R = 8.314 J·K⁻¹mol⁻¹
T = 298 K
n = 2
F = 96 485 C/mol
Calculation:
[tex]E = 0 - \frac{8.314 \times 298}{2 \times 96 485}\ln1.93[/tex]
= -0.0128 × 0.658
= -0.0085 V
= [tex]\boxed{\text{-8.5 mV}}[/tex]
Shana solves stoichiometry problems using the equation for the synthesis of water. Which interpretation of the balanced equation would cause Shana to make a mistake? Two moles of hydrogen react with one mole of oxygen to form two moles of water. Two grams of hydrogen react with one gram of oxygen to form two grams of water. Two molecules of hydrogen react with one molecule of oxygen to form two molecules of water. Two liters of hydrogen react with one liter of oxygen to form two liters of water.
Answer: Two grams of hydrogen react with one gram of oxygen to form two grams of water.
Answer : The wrong statement is, Two grams of hydrogen react with one gram of oxygen to form two grams of water.
Explanation :
Synthesis reaction : It is a type of reaction in which the reactants present in elemental state that reacts to give a single product.
It is represented as,
[tex]X+Y\rightarrow XY[/tex]
where, X and Y are the reactants and XY is the product.
The balanced synthesis reaction of water will be,
[tex]2H_2+O_2\rightarrow 2H_2O[/tex]
By the stoichiometry we can say that, 2 moles of hydrogen [tex](H_2)[/tex] react with 1 mole of oxygen [tex](O_2)[/tex] to form 2 moles of water [tex](H_2O)[/tex] as a single product.
Or we can say that,
2 molecules of hydrogen react with 1 molecule of oxygen to form 2 molecules of water.
Or,
2 liters of hydrogen react with 1 liter of oxygen to form 2 liters of water.
These three statements are correct.
But the statement, 2 grams of hydrogen react with 1 gram of oxygen to form 2 grams of water are incorrect statement.
Hence, the wrong statement is, Two grams of hydrogen react with one gram of oxygen to form two grams of water.
An Erlenmeyer flask contains 25.00 mL of 0.500 M HCl before a titration is begun. How many moles of hydrogen ions are present in the flask at this time?
0.0125
12.5
20.0
50.0
Answer:
0.0125 mol.
Explanation:
Molarity of a solution is the no. of moles of a solute per 1.0 L of the solution.
M of HCl = 0.5 mol/L.
V = 25.0 mL = 0.025 L.
∴ no. of moles of HCl present in the flask at this time = MV = (0.5 mol/L)(0.025 L) = 0.0125 mol.
The wavelength of a photon that has an energy of 7.53* 10^-32
Answer:
= 2.64 × 10^7 m
Explanation:
Energy is given by the formula;
E = hc/λ
Where h is Planck’s constant (= 6.626 x 10^-34 Js), c is the speed of light (3.00 x 108 m/s) and λ is the wavelength in meters.
Therefore, wavelength will be given by;
λ = hc/E
= (6.626× 10^-34 × 3 × 10^8)/(7.53 × 10^-32)
= 2.64 × 10^7 m
Whats an electronegativity?
Answer:
Electronegativity is the measure of a tendency of an atom to attract the bonding pairs of electrons.
Electronegativity is a measure of how badly an atom wants electrons. The higher an atom's electronegativity, the more greedy it is for electrons, the more it wants to try to steal them from other atom's. This involves a concept called ionic bonding because there are electron givers and electron takers. This has to do with whether an element is a metal or a nonmetal.
Metals are very generous and are willing to let go of or give there electrons away. On the other hand, nonmetals don't give up their electrons.
Describe each of the following models of the atom: the plum pudding model, Bohr's model, and the wave mechanical model.
Answer:
pulm pudding: Model of the atom proposed by J.J Thomson as a result of his work with cathode ray tubes. In it, the neutral atom contains negatively charged particles (electrons) scattered throughout a lump of positive charge like raisins in plum pudding.
The 'plum pudding' model describes an atom as a large positively charged pudding with negative electrons dotted around it. The Bohr model illustrates the atom with a central nucleus and electrons in fixed orbits. The wave mechanical model uses quantum mechanics to depict an electron cloud around the nucleus.
Explanation:The plum pudding model of the atom was proposed by J.J. Thomson in 1897. This model suggests that the atom is a 'pudding' of positive charge with 'plums' of negative charge ( electrons) scattered throughout.
Next, the Bohr's model asserted by Niels Bohr in 1913, depicts the atom as a small, positively charged nucleus surrounded by electrons that travel in circular orbits around the nucleus. Each orbit corresponds to a specific energy level.
Lastly, the wave mechanical model, also known as the quantum mechanical model, was developed throughout the 1920s. This model implies that it is impossible to determine precisely both the position and momentum of an electron at the same time. Therefore, electron location is represented as an electron cloud around the nucleus, where the density of the cloud indicates the probability of finding the electron in that location.
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What is the temperature in C of a sample of 4.75 moles of CO2 gas at a pressure of 0.998 atm that is placed in a container with a volume of .125 L?
Answer:
[tex]\boxed{\text{-272.83 }^{\circ}\text{C}}[/tex]
Explanation:
We can use the Ideal Gas Law to calculate the temperature.
pV = nRT
[tex]T = \dfrac{pV}{nR}[/tex]
Data:
p = 0.998 atm
V = 0.125 L
n = 4.75 mol
R = 0.082 06 L·atm·K⁻¹mol⁻¹
Calculation:
[tex]T = \dfrac{0.998 \times 0.125}{4.75 \times 0.082 06} =\text{0.320 K}[/tex]
T = (0.320 – 273.15) °C = -272.83 °C
Note: This is an impossible situation. CO₂ solidifies at -78.5 °C.
If CO₂ were an ideal gas, the calculated temperature would be [tex]\boxed{\text{-272.83 }^{\circ}\text{C}}.[/tex]
What is the most common type of skeleton
endoskeleton
exoskeleton
Apaskeleton
Answer:
endoskeleton
Explanation:
most organisms that we know of have an endoskeleton
(but trust Ariellijo46 more, he probably knows more than that of my knowledge)
Answer:
Exoskeleton
Explanation:
The most common type of skeleton, is exoskeleton.
Consider the unbalanced chemical equation HBr + Al AlBrs + H2. When
coefficients are added to balance the equation, which two substances will
have a coefficient of 2?
If we balance the reaction.Then it seems like
6HBr + 2Al > 2AlBr3 +3H2
where, Al and AlBr3 has their coefficient of 2.
Answer:
[tex]\boxed{\text{Al and AlBr$_{3}$}}[/tex]
Explanation:
Step 1. Pick the most complicated-looking formula (AlBr₃).
Put a 1 in front of it.
HBr + Al ⟶ 1AlBr₃ + H₂
Step 2: Balance Al.
We have fixed 1 Al on the right. We need 1 Al on the left.
Put a 1 in front of Al.
HBr + 1Al ⟶ 1AlBr₃ + H₂
Step 3. Balance Br.
We have fixed 3Br on the right. We need 3Br on the left.
Put a 3 in front of HBr.
3HBr + 1Al ⟶ 1AlBr₃ + H₂
Step 4. Balance H.
We have fixed 3 H on the left. We need 3 H on the right.
We need one more H (½ H₂) on the right.
3HBr + 1Al ⟶ 1AlBr₃ + ³/₂H₂
Oops. Fractional coefficients! We must multiply all coefficients by a number to give integer coefficients.
Step 5. Get rid of fractions.
Multiply all coefficients by2.
6HBr + 2Al ⟶ 2AlBr₃ + 3H₂
All species have a coefficient. The equation is now balanced.
[tex]\text{The two substances with a coefficient of 2 are }\boxed{\textbf{Al and AlBr$_{3}$}}[/tex]
During which process of the hydrologic cycle does the sun heat surface water, causing the water to change from its liquid state to its gaseous state? A. Condensation B. Infiltration C. Evaporation D. Precipitation
Answer:
I believe it is evaporation but I could be wrong
Explanation:
Answer : The correct option is, (C) Evaporation.
Explanation :
Condensation : It is defined as the process in which the phase changes from the gaseous state to the liquid state as constant temperature.
Infiltration : It is defined as the process in which the water present on the surface of the ground, enters into the soil.
Evaporation : It is defined as the process in which the phase changes from the liquid state to the gaseous state as constant temperature.
Precipitation : It is defined as the chemical process in which the solid substance is separated out from the liquid material.
According to the question, during the evaporation process of the hydrologic cycle, the sun heat the surface water, causing the water to change from its liquid state to its gaseous state.
Hence, the correct option is, (C) Evaporation.
Some physical evidence was obtained from a crime scene. For which of these pieces of evidence will forensic scientists conduct an identification test?
A.
a hair strand
B.
a black powder
C.
a glove
D.
bloodstains
Answer:
B. a black powder
Explanation:
Just got it right on the test Edmentum/PLATO
Final answer:
Forensic scientists perform identification tests on all evidence; DNA analysis is conducted on D. bloodstains and A. hair strands, while other materials like black powder and gloves are tested for chemical composition or trace evidence.
Explanation:
Forensic scientists conduct an identification test on all pieces of physical evidence obtained from a crime scene to determine their origin or match them to a suspect. In the context of the options provided (a hair strand, a black powder, a glove, and bloodstains), forensic scientists would likely perform DNA extraction and analysis on the bloodstains and possibly on the hair strand if the root is intact, as these biological samples contain DNA that can be used to identify a person.
The forensic team would also test the black powder for any chemicals or substances to understand its composition, and examine the glove for DNA, fingerprints, or other trace evidence that might associate it with a suspect or the crime scene.
Energy is needed to break bonds in chemical reactions
Answer:
This is True
Explanation:
When a chemical reaction occurs, molecular bonds are broken and other bonds are formed to make different molecules. For example, the bonds of two water molecules are broken to form hydrogen and oxygen. Energy is always required to break a bond, which is known as bond energy.
Final answer:
The true statement reflects the fact that energy, specifically bond energy, is needed to break chemical bonds during reactions. This is an essential concept in chemical reactions, as bonds must be broken before new ones can be formed, resulting in changes in energy.
Explanation:
The statement Energy is needed to break bonds in chemical reactions is true. In any chemical reaction, bonds between atoms must be broken so that new bonds can form, and this process requires an initial input of energy. This energy is known as the bond energy, which varies depending on the chemical bond but is specific to each type of bond. When a bond is broken, the stored potential energy within the bond is transformed into other forms, such as kinetic energy, which might manifest as heat.
Furthermore, while it costs energy to break bonds, energy is also released when new bonds are made during the reaction. The overall energy change in a chemical reaction depends on the balance between the energies required to break bonds in the reactants and the energies released when new bonds form in the products. It's critical to understand that the same amount of energy required to break a bond is released when that bond is formed.
In summary, all chemical reactions involve changes in energy, whether absorbing it to break old bonds or releasing it when new bonds form. The concept of bond energy is crucial for explaining the dynamics of chemical reactions and the stability of molecules.
This gas can be formed if a hydrogen bomb is detonated.
Answer:
Helium.
Explanation:
Hydrogen in the bomb is used in the process of detonation. A stream of tritium, an isotope of hydrogen is released and this fissionable material is very unstable thus it turns during the detonation to helium 3. This triggers a series of reactions that produce large amounts of heat to the surrounding environment causing destruction.
What makes a molecule polar?
Answer:
Polar covalent bonds within the molecule that are not symmetric
Explanation:
(APEX)
Hope you got this in time
Answer:
polar covalents bonds within the molecule that are not symmetrical
Explanation:
PLEASE HELP ASAP
it's Actually science sorry
Which type of disease is caused by genetic or lifestyle factors?
a(n)______ disease
Which type of disease is caused by pathogens?
a(n)______ disease
Answer:
a infectious and a noninfectious disease
Explanation:
Answer:
what gigi said but other way around
Explanation:
Which of the following correctly shows the word equation for the formation of water from oxygen and hydrogen?
A. H2+O2→H2O
B. hydrogen + oxygen → water
C. water → hydrogen + oxygen
D. H2O→H2+O2
A shows okay please mark it brainliest
Answer:
The correct answer is option B.
Explanation:
Water is formed formed by combination of oxygen and hydrogen atoms.
The chemical equation for the formation of the water is given as:
[tex]2H_2+O_2\rightarrow 2H_2O[/tex]
According to reaction, 2 moles of hydrogen gas reacts with 1 mole of oxygen produce 2 moles of water molecules.
Hydrogen + Oxygen → Water
The temperature scale witch starts at absolute Zero is the
The answer is the: Kalvin Scale.
Given the following heats of combustion: C2H2(g) = -1300 kJ/mole, H2(g) = -286 kJ/mole, C2H6(g) = -1560 kJ/mole, Calculate the enthalpy change for the following reaction
C2H2(g) + 2H2(g) → C2H6(g)
a. -312 kJ
b. -26 kJ
c. +312 kJ
d. -26 kJ
Answer is A.
First plug in the designated enthalphy values for eachThen solve for the equation as you would an algebra problemWhat was one idea Dalton taught about atoms
According to Dalton's atomic theory :
All matter is made up of atoms which are indivisible and indestructible. Atoms of the same element have the same property and same mass. Compounds are made up of atoms of different elements. Atoms are rearranged in a chemical reaction.One idea that Dalton taught about atoms is that they are indivisible and indestructible particles.
John Dalton, an English scientist, proposed his atomic theory in the early 19th century. One of the key ideas in Dalton's theory was that atoms are indivisible and indestructible particles. According to Dalton, atoms are the fundamental building blocks of matter, and they cannot be divided into smaller parts or destroyed in chemical reactions.
Dalton based his idea on experimental evidence and observations. He performed numerous chemical experiments and analyzed the results to develop his atomic theory. One of the crucial observations that supported his theory was the law of conservation of mass, which states that in a chemical reaction, matter is neither created nor destroyed. This led Dalton to conclude that atoms, as the fundamental units of matter, must remain intact during chemical reactions.
Dalton's idea of indivisible and indestructible atoms laid the foundation for our modern understanding of atomic structure. However, with advancements in scientific knowledge and the discovery of subatomic particles, we now know that atoms are composed of even smaller particles, such as protons, neutrons, and electrons. Nevertheless, Dalton's concept of atoms as fundamental units of matter that retain their identity in chemical reactions remains a significant contribution to the field of atomic theory.
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what term is used to describe the height of a wave
Amplitude
Frequency
Period
Wavelength
Amplitude is the correct answer.
The term that is used to describe the height of a wave is called Amplitude. Option A is correct.
A wave can be defined as a disturbance that moves energy from one point to another without transferring matter between these two points. Waves occur in nature, whether they are light waves that enable you to see or sound waves that allow you to hear.
The following are some of the wave properties:
1. Wavelength (λ)The distance between two similar points on a wave, such as the distance between two adjacent crests or two adjacent troughs, is called wavelength. Wavelength is denoted by λ.
2. Amplitude (A)The distance from the equilibrium position to the crest or trough of a wave is called amplitude. The amplitude of a wave is the measure of the amount of energy it contains.
3. Frequency (f)The number of waves that pass a given point per unit time is called frequency. It is measured in Hertz (Hz) or cycles per second (cps).
4. Period (T)The time taken for a wave to complete one full cycle is known as the period. The period of a wave is the inverse of its frequency.
5. Velocity (V)The distance travelled by a wave per unit time is known as velocity. It is the product of the wavelength and frequency of a wave.
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HELP ASAP!! GIVING BRAINLIEST!! BUNCH OF POINTS!
Draw the rays, and insert text boxes to describe reflection, absorption, and transmission for the book and the glass.
Answer:Reflection, Transmission, and Absorption Reflection is the process by which electromagnetic radiation is returned either at the boundary between two media (surface reflection) or at the interior of a medium (volume reflection), whereas transmission is the passage of electromagnetic radiation through a medium
Explanation:
i cant draw whatever it was but i can answer
Answer:
Look at the image i put
Explanation:
Your welcome please give me brainliest
Sodium is a dull-coloured metal. It is very reactive and must be stored in oil for safety.
Chlorine is a pale green, toxic gas. Small amounts are used to disinfect swimming pools.
A reaction between sodium and chlorine produces a white, crystalline solid, which is commonly known as table salt.
Q: Explain why it is difficult to get chlorine out of sodium chloride.
Answer:
Hi there!
It is difficult to remove chlorine out of sodium chloride because in order to separate them you must put that energy into the salt.
Chlorine gas is toxic, and extremely irritating to the eyes and mucous membranes.
Which can be categorized as a use of plasma in technology?
Answer:
The use of plasma is in technology is very broad, including the medical sector, automotive and areas of scientific development
Explanation:
Plasma technology can be used in various ways, where it is a matter of joining materials or modifying the surface properties in a defined way. This technology can modify the surfaces treated, the cleaning of contaminated components, the activation of plastic parts, the etching of fluoroplastics and silicon and the application of coatings to these plastic parts are some applications.
Plasma systems are used in the following industries, among others: Electronic industry and semiconductor manufacturing: plasma cleaning to degrease metal surfaces before welding, printing circuits or coating and for the extraction of undesirable materials or the addition of others. Medical technology: Cleaning and sterilization with plasma implants. Rubber processors: Elimination of lubricants before sticking or joining chemically Automotive technology: Plasma cleaning applied at numerous stages along the production line allows combinations of materials that are only possible with the help of plasma procedures. Electron Microscopy: the plasma is used to clean the microscope nozzles, grids and sample holders.
Answer:
C
Explanation:
making fluorescent lights for houses
Which of the following compound names is obviously INCORRECT?
potassium dichromate
carbon dioxide
dihydrogen oxide
mercury chloride
The compound which is obviously incorrect is dihydrogen oxide
The compound name 'mercury chloride' is incorrect because it does not specify the oxidation state of mercury, which can be either I or II.
The compound name that is obviously incorrect among the given options is mercury chloride. The reason this name is incorrect is because it uses the common or trivial name for the element mercury instead of its systematic IUPAC name. In IUPAC nomenclature, mercury can form two common compounds: mercury(I) chloride also known as mercurous chloride (Hg2Cl2) and mercury(II) chloride also known as mercuric chloride (HgCl2). The correct IUPAC nomenclature must specify the oxidation state of mercury since it can have multiple oxidation states. The other names given, such as potassium dichromate (K2Cr2O7), carbon dioxide (CO2), and dihydrogen oxide (H2O), are correct according to IUPAC rules.
What is the molar ratio between water and oxygen, given the following equation? 2C4H10 + 13O2 -> 8CO2 + 10H2O
A. 10:2
B. 10:13
C. 2:13
D. 8:10
Answer:
B. 10:13
Explanation:
It is clear from the following balanced equation:
2 C₄H₁₀ + 13 O₂ → 8 CO₂ + 10 H₂O13 mole of oxygen (O₂) react with butane (C₄H₁₀) to give carbon dioxide (CO₂) and 10 moles of water (H₂O).
∴ The molar ratio between water and oxygen = (no. of moles of water : no. of moles of water) = (10:13)
So, the right choice is:
B. 10:13
Answer:
10:13
Explanation:
Answer via Educere/ Founder's Education
The molecules of DNA produced in replication are...
1.Identical
2.complementary
3.mutated
4.connected
A) Identical
Hope this helps :)
The molecules are identical. It is replicating the DNA, making exact copies of it. Could you imagine if the DNA in our bodies weren't the same? We'd look pretty weird.
What volume of 0.2500 M NaOH is required to neutralize 10.00 mL of 0.4000 M H2SO4
Answer:
volume is 32.00 mL
Explanation:
the balanced equation for the neutralisation reaction is as follows
2NaOH + H₂SO₄ ---> Na₂SO₄ + 2H₂O
molar ratio of NaOH to H₂SO₄ is 2:1
number of H₂SO₄ moles reacted - 0.4000 mol/L x 10.00 x 10⁻³ L = 0.00400 mol
according to the molar ratio
number of NaOH moles reacted - 2 x number of H₂SO₄ moles reacted
number of NaOH moles reacted - 2 x 0.004000 mol = 0.008000 mol
concentration of NaOH is - 0.2500 mol/L
concentration = number of moles of solute / volume
rearrange the equation
volume = number of moles / concentration
volume = 0.008000 mol / 0.2500 mol/L
volume = 0.03200 L
therefore volume is 32.00 mL
To neutralize 10.00 mL of 0.4000 M H2SO4, you will need 32.00 mL of 0.2500 M NaOH.
Explanation:To determine the volume of 0.2500 M NaOH required to neutralize 10.00 mL of 0.4000 M H2SO4, we can use the concept of stoichiometry and the balanced chemical equation for the neutralization reaction:
H2SO4 + 2NaOH → Na2SO4 + 2H2O
From the equation, we can see that 1 mole of H2SO4 reacts with 2 moles of NaOH.
First, we calculate the moles of H2SO4 in the given solution: 0.4000 M * 0.01000 L = 0.004000 mol.
Since the mole ratio of H2SO4 to NaOH is 1:2, we need twice the moles of NaOH to neutralize the H2SO4. Thus, the required moles of NaOH is 2 * 0.004000 mol = 0.008000 mol.
Next, we can use the molarity and the moles of NaOH to calculate the volume of NaOH:
The volume of NaOH = Moles of NaOH / Molarity of NaOH = 0.008000 mol / 0.2500 M = 0.03200 L = 32.00 mL.
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Carbon Dioxide in a 34 L container at a pressure of 387 mm Hg is transferred to a container with a pressure of 274 mm Hg. What is the new volume if the temperature changes from 211 K to 350 K?
Answer:
V2= 0.0796m3
Explanation:
We have that for a real gas the following relation is fulfilled:
PV / T = constant
To use this formula I need to pass the pressure of mmHg to KPa and the volume of L to m3, knowing that
1Kpa = 7.50062mmHg
1L = 0.001m3
So i can say
P1V1/T1 =P2V2/T2
So
V2= P1V1T2/P2T1
V2= 51.60KPa*0.034m3*350k/36.53KPa*211k
finally
V2= 0.0796m3
Hi can u help me pls? I'm totally stuck . The natural source of acidity in rain water is _____.
carbonic acid
sulfuric acid
nitric acid
all of the above
Answer-The correct option is option d with says all of the above.
Explanation- All three acids that are given combined together to form acid rain in which nitric and sulphuric acid are stronger acids present while carbonic acid is a weaker one.
The carbon dioxide admitted in air combines with water to form carbonic acid and gives a weak acidic nature to rainwater. Pollution in nature makes sulphur and nitrogen present in air react to form the stronger acids responsible for acid rain.
All scientific ideas are tentative and subject to change and improvement in principle.
True
False
Answer:
true
Explanation:
It will be True. :)
what is the shape of ICl4-?
Answer:
the ICl4− ion forms a molecular structure that is square planar, an octahedron with two opposite vertices missing.
The shape of ICl₄⁻ is square planar due to the arrangement of six regions of electron density around the central iodine atom.
The molecular shape of ICl₄⁻ is square planar. This ion includes six regions of electron density around the central iodine atom: four bonding pairs with chlorine atoms and two lone pairs of electrons.
These six regions of electron density adopt an octahedral arrangement to minimize repulsions, with the lone pairs occupying opposite positions. As a result, the four bonded chlorine atoms are arranged in a square planar geometry.The central iodine atom has six electron groups around it (four bonding pairs and two lone pairs).These groups arrange themselves in an octahedral geometry to minimize electron repulsion.The lone pairs occupy two opposite positions, leading to a square planar shape for the bonded chlorine atoms.