C. Under these conditions, hydrogen / ethanol will release more energy in 1 second is the correct answer.
The energy change that occurs when one mole of a compound is burnt in excess oxygen under standard conditions is called the standard enthalpy change of combustion. The standard enthalpy change of combustion of hydrogen is -286kJ/moL.Ethanol combustion is an exothermic process. The chemical reaction that occurs when ethanol burns releases a lot of heat and energy, 277.7 kJ per mole of ethanol, in addition to the creation of new compounds. In conclusion, ethanol burns by combining with oxygen to create carbon dioxide, water, and heat.The standard enthalpy change of combustion is the energy change that happens when one mole of a compound burns in excess oxygen under typical conditions. Enthalpy change for hydrogen combustion is typically -286kJ/moL.To know more about Hydrogen check the below link:
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What amino acid sequence is encoded by the codon sequence GCCGCGACCGCUACU?
Answer
Ala-Ala-Thr-Ala-Thr
Procedure
We will use the genetic code in the table below to solve this question.
Every three consecutive letters need to be matched with the given code
A good strategy s to split the sequence as follows: GCC-GCG-ACC-GCU-ACU
After matching, we have:
Ala-Ala-Thr-Ala-Thr
pls answer question will mark brainliset tyty
Answer:
Graph D.
Explanation:
Help a girl out I’m rushing
Answer:
spring
Explanation:
In a solution with a pH of 3 a. Litmus Is blue and phenolphthalein is colorless b. Litmus is blue phenolphthalein is red c. Litmus Is red phenolphthalein is colorless d. Litmus is red phenolphthalein is red.
Answer
c. Litmus Is red phenolphthalein is colorless
Explanation
A solution with a pH of 3 is acidic. The main use of litmus is to test whether a solution is acidic or basic, blue litmus turns red under acidic conditions, and red litmus turns blue under basic or alkaline conditions. Phenolphthalein is often used as an indicator in acid–base titrations. phenolphthalein, it turns colorless in acidic solutions and pink in basic solutions.
Therefore, the correct option for a solution with a pH of 3 is:
c. Litmus Is red phenolphthalein is colorless
what mass of ag2so4 will precipitate when 500.0 ml of 0.30 m agno3 is combined with 500.0 ml of 0.15 m na2so4? ag2so4: ksp
The mass of [tex]Ag_2SO_4[/tex] precipitate that would be formed would be 23.38 grams.
Stoichiometric problemAqueous [tex]AgNO_3[/tex] and aqueous [tex]Na_2SO_4[/tex] combine in a chemical reaction to form [tex]Ag_2SO_4[/tex] precipitate according to the following equation:
[tex]2AgNO_3 + Na_2SO_4 -- > Ag_2SO_4 + 2NaNO_3[/tex]
From the equation of the reaction, the mole ratio of the two reactants is 2:1.
Stoichiometrically, it means 2 moles of [tex]AgNO_3[/tex] require 1 mole of [tex]Na_2SO_4[/tex] for a complete reaction.
Recall that: mole = molarity x volume
Thus:
500 mL, 0.30 M [tex]AgNO_3[/tex] = 500/1000 x 0.3= 0.15 moles
500 mL. 0.15 M [tex]Na_2SO_4[/tex] = 500/1000 x 0.15= 0.075 moles
This means that the two reactants are stoichiometrically balanced.
Mole ratio of [tex]Na_2SO_4[/tex] and [tex]Ag_2SO_4[/tex] = 1:1
Thus, the equivalent mole of [tex]Ag_2SO_4[/tex] will be 0.075 moles.
The molar mass of [tex]Ag_2SO_4[/tex] = 311.799 g/mol
Mass of 0.075 moles [tex]Ag_2SO_4[/tex] = 0.075 x 311.799
= 23.38 grams
In other words, the mass of [tex]Ag_2SO_4[/tex] that will precipitate from the reaction would be 23.38 grams.
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The frequency of a wave is 2.8 x 10^3 Hertz. What is the wavelength of these gamma rays?
Show all work!
The frequency of a wave 2.8 x 10³ Hertz is then the wavelength of these gamma rays is 107 nm
Wavelength is the the distance between two successive crests or troughs of a wave
Here given data is
Frequency = 2.8 x 10³ Hertz
Velocity of gamma rays = 3×10⁸m/s
We have to calculate wavelength of these gamma rays?
So, wavelength = velocity/frequency
λ = v/f
λ = 3×10⁸m/s/2.8 x 10³ Hertz
λ = 107 nm
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Consider a galvanic cell with a beaker of sulfuric acid and a beaker of nitric acid. The sulfuric acid beaker contains a strip of tin, and the nitric acid cell contains a strip of platinum. A wire runs between the strips. The reaction that occurs is as follows: 3Sn(s) + 2NO_3^–(aq) + 8H^+(aq) → 3Sn_2+(aq) + 2NO(g) + 4H_2O(l). Which electrode is the anode? (1 pt)
*
1 point
tin
platimun
Consider a galvanic cell with a beaker of sulfuric acid and a beaker of nitric acid the sulfuric acid beaker contains a strip of tin, and the nitric acid cell contains a strip of platinum a wire runs between the strips then tin is the anode
Galvanic cell is the electrochemical cell that converts the chemical energy of spontaneous redox reactions into electrical energy
Here given data is galvanic cell with a beaker of sulfuric acid and a beaker of nitric acid the sulfuric acid beaker contains a strip of tin, and the nitric acid cell contains a strip of platinum a wire runs between the strips and the reaction is
3Sn(s) + 2NO₃⁻(aq) + 8H⁺(aq) → 3Sn²⁺(aq) + 2NO(g) + 4H₂O(l)
Then in the galvanic cell oxidation takes place at the anode means the tin is the anode
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which pollutant would you suggest the government try to limit in order to slow down the breakdown of the marble on the taj mahal
Answer:
SO2
Explanation:
SO2 causes acid rain which is leading to dissolving of the marble on the Taj Mahal
SO2 reacts with water to come down as sulfuric acid during acid rains
2. You were asked to examine a prepared slide under the HPO. Your eyepiece is 20x and the HPO is 80x. How many times was the specimen magnified?
Answer:
Explanation:
Magnification = 20 * 80
1600
In clinical applications, the unit parts per million (ppm) is used to express very small concentrations of solute, where 1 ppm is equivalent to 1 mg of solute per 1 L of solution. Calculate the concentration in parts per million for each of the solutions.There is 43 μg of calcium in a total volume of 87 mL .concentration of calcium: _________ppm There is 0.91 mg of caffeine in a total volume of 105 mL .concentration of caffeine: _________ppm There is 0.47 mg of trace particles in a total volume of 95 dL .concentration of trace particles: ___________
Answer & Procedure
To solve this problem you will need to transform all the concentrations to the equivalence of ppm, which is 1 mg of solute per 1 L of solution.
Calcium: There are 43 μg of calcium in a total volume of 87 mL.
[tex]\frac{43\mu g}{87\text{ mL}}\frac{1\text{ mg}}{1000\text{ }\mu g}\frac{1000\text{ mL}}{1\text{ L}}=0.49\frac{mg}{L}=0.49\text{ ppm}[/tex]Caffeine: There is 0.91 mg of caffeine in a total volume of 105 mL.
[tex]\frac{0.91\text{ mg}}{105\text{ mL}}\frac{1000\text{ mL}}{1\text{ L}}=8.67\frac{mg}{L}=\text{ 8.67 ppm}[/tex]Trace particles: There is 0.47 mg of trace particles in a total volume of 95 dL.
[tex]\frac{0.47\text{ mg}}{95\text{ dL}}\frac{10\text{ dL}}{1\text{ L}}=0.049\frac{mg}{L}=0.049\text{ ppm}[/tex]ASAP
Compare the heat energy in a teaspoon of boiling water and a swimming pool full of room temperature water.
This is an essay question
The heat energy teaspoon of boiling water and a swimming pool full of room temperature water then swimming pool have more heat energy than the teaspoon of boiling water
Heat energy is the result of movement of tiny particles called as atom, molecule, or ion in solid liquid and gases and heat energy is the transfer from one object to the another and in Celsius scale water freezes at 0°C and boil at 100°C to 90°C however the swimming pool contains a lot more water therefore the pool has more thermal energy than the cup of tea even though the tea is hotter than the water in the pool that's why heat energy is more in the swimming pool then in teaspoon of boiling water
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3.Look at the positions of calcium, beryllium, and magnesium on the periodic table. Based on their locations, predict how many valence electrons these elements have and predict what the reactivity of these elements will generally be.
Answer:
They have two valence electrons and enter into reactions where they can donate their two valence electrons
Explanation:
Here, we want to predict the number of valence electrons
The elements belong to the group 2 of the periodic table
Elements in the periodic table are placed in groups based on the number of valence electrons they have
It is expected that elements in group 2 of the periodic table have 2 valence electrons
Their reactivity is that, they react with other atoms by donating this two valence electrons. They then achieve the electronic configuration of the noble gas in the last period
complete the fission reaction.235U + 1 neutron → [X] +141Ba + 3 neutronsMass Number:Chemical Symbol:
It's important to know that the reaction must have the total mass involved before and after due to the law of conservation of mass. This means that the total mass number of the left side of the reaction must be equal to the right side. So, we have the following
[tex]235+1=X+141+3[/tex]Notice that 235 is the mass number of U, 1 is the mass number of the neutron, X represents the mass number of the unknown element, 141 represents the mass number of Ba, and 3 represents the mass number of three neutrons. This means X should have a mass number of 92, which is the element Kr.
Therefore, the mass number is 92 and the chemical symbol is Kr.
A 20. 0-ml sample of 0. 30 m hbr is titrated with 0. 15 m naoh. What is the ph of the solution after 40. 3 ml of naoh have been added to the acid?.
The ph of the solution after 40. 3 ml of NaOH have been added to the acid is 10.
Titration is a commonplace laboratory technique of quantitative chemical analysis to determine the attention of an identified analyte. A reagent, termed the titrant or titrator, is ready as a trendy answer of recognized awareness and extent.
Calculation:-
Normality of acid normality of base
= nMV nMV
= 1 × 0. 30 × 0.02 1 × 0. 15 ×0.0403 L
= 6 × 10⁻³ = 6.1 × 10⁻³
overall base will be high
net concentration = 6.1 × 10⁻³ - 6 × 10⁻³
= 0.1 × 10⁻³
= 1 × 10⁻⁴
p0H = -log[1 × 10⁻⁴]
= 4
pH = 14 - 4
= 10
A titration is defined as 'the manner of determining the amount of a substance A by using adding measured increments of substance B, the titrant, with which it reacts till precise chemical equivalence is completed the equivalence factor.
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Do you think the substances after the reaction was still copper (II) chloride and aluminum?
When aluminum is reacts copper (II) chloride then it will form aluminum chloride and Copper.
Aluminum as well as copper(II) chloride combine very vigorously, causing the reaction mixture to become extremely hot as heat was produced, the aluminum foil to breakdown, a reddish brown solid to appear, as well as gas bubbles to be released.
The chemical reaction can be written as:
2Al + 3CuCl2 → 3Cu + 2AlCl3
Therefore, Copper and aluminum chloride will be formed after the reaction as a product.
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The combustion of phosphorus trichloride yields diphosphorus pentoxide and dichlorine monoxide. How many liters of oxygen are needed to burn 25.0 L of PCl3?
All I need help with is the balanced reaction please
Answer:1. How many moles is 400.0 g of Al 2(SO4)3?
Mol = mass/molar mass
Mol = 400.0g/342g/mol = 1.169 mol
2. Which is the percent composition of bromine in the compound NaBr?
% Br = (mass Br/mass NaBr) x 100
% Br = (79.90g/102.88g) x 100 = 77.7%
3.How many molecules are in 3.6 grams of NaCl?
Molecules NaCl = 3.6g NaCl x 6.02 x 1023 NaCl molecules = 3.7 x 1022 molecules
58.43g NaCl
4.How many grams are in 1.946 moles of NaCl?
From Mol = mass/molar mass,
Mass = mol x molar mass
Mass NaCl = 1.946 mol x 58.43 g = 113.7 g
Explanation:
An ionic bond is the result of....Group of answer choicesElectron sharingNon-metals bonded togethercharge attractionMolecules
An ionic bond is also called an electrovalent bond. It is formed from the electrostatic attraction between oppositely charged ions in a chemical compound.
Answer: charge attraction.
The final digit in a measurement is obtained by estimating between the smallestmarked lines.a) Trueb) False
Answer:
[tex]A:\text{ True}[/tex]Explanation:
Here, we want to get how the final digit in a measurement is obtained
Mathematically, the final digit can be obtained by estimation
Hence, we say that the value is uncertain
The final digit is obtained by a mark or between the last mark and the next mark in a measurement
Thus, we call this value uncertain since it is estimated
How many joules of heat are needed to completely vaporize 24.40 grams of water at its boiling point?Given ΔHvap = 40.6 kJ/mol
55,035.5 Joules
Explanations:Heat of vaporisation is the amount of energy required to transform a mole of liquid water into gas at constant temperature.
Given the following parameters:
Mass of water = 24.40 grams
ΔHvap = 40.6 kJ/mol
Determine the moles of water
Mole = mass/molar mass
Mole = 24.40/18
Mole of water = 1.356moles
Determine the required heat required
Q = mole of water * ΔHvap
Q = 1.356moles * 40.6kJ/mole
Q = 55.0355kJ
Q = 55.0355 * 1000
Q = 55,035.5 Joules
Hence joules of heat needed to completely vaporise 24.40 grams of water at its boiling point is 55,035.5 Joules
Which statement below explains why some microorganisms have the ability to repair a malfunctioning gene by using the human version of the gene?
A
Both organisms are classified in the same kingdom.
The genome of both organisms is identical.
(C) The genetic code of all living organisms is universal.
D
Microorganisms are typically lower level prokaryotes while humans are higher level eukaryotes.
The statement the genetic code of all living organisms is universal explains why some microorganisms have the ability to repair a malfunctioning gene by using the human version of the gene (Option C).
What is the genetic code?The genetic code is a set of instructions to encode protein by using specific triplets of nucleotides or codons, which indicate particular amino acids that will be added during translation.
Therefore, with this data, we can see that the genetic code is a group of instructions to produce proteins that are conserved in the tree of life.
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The frequency of a wave is 2.80 x 10^18 Hertz. Find the wavelength and energy of this wave.
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The frequency of a wave is 2.80 × 10¹⁸ Hertz. The wavelength is 0.10 nm and energy of this wave is 2.80 × 10¹⁸ .
Given that :
The frequency of a wave, v = 2.80 × 10¹⁸ Hz
wavelength = ?
formula for the wavelength is given as follows :
λ = c/ v
c = speed of light
λ = 3 × 10⁸ m/s / 2.80 × 10¹⁸ s⁻¹
λ = 1.07 × 10⁻¹⁰ = 0.10 nm
Energy of wave = h v
h = planks constant
E = 6.626 × 10⁻³⁴ J.s × 2.80 × 10¹⁸ s⁻¹
E = 18.55 × 10 ⁻¹⁶ J
Thus, The frequency of a wave is 2.80 × 10¹⁸ Hertz. The wavelength is 0.10 nm and energy of this wave is 2.80 × 10¹⁸ .
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A cycling has a radius of 2.63 cm and a height of 1.72 cm a) Calculate the volume of the cylinder b) if the cylinder weight 78.53g, calculate its density and specific gravity.
The volume of a cylinder is calculated using the following formula:
[tex]V=\pi\times r^2\times h[/tex]Where r is teh radius of the base and h is the high:
[tex]V=\pi\times(2.63\operatorname{cm})^2\times1.72cm=37.37cm^3[/tex]As we know 1cm³=1ml
to calculate the density we just have to divide the mass by the calculated volume:
[tex]\text{density}=\frac{78.53g}{37.37ml}=\text{ }2.10\text{ }\frac{g}{ml}[/tex]The especific gravity is the density in relation to the density of water which is 1 g/ml therefore:
[tex]\text{specific gravity =}\frac{density}{water\text{ density}}=\frac{2,10g/ml}{1g/ml}=\text{ 2.1}[/tex]A 200g piece of iron absorbs 8980 joules to raise the temperature from 20°C to 120°C. Find the specific heat of iron?
Answer:
The specific heat of iron is 0.449 J/g°C.
Explanation:
First, let's see the formula of specific heat:
[tex]c=\frac{q}{m\cdot\Delta T}\begin{cases}{q=amount\text{ of heat \lparen Joules\rparen}} \\ {m\text{ = mass of substance \lparen grams\rparen}} \\ \Delta T={Change\text{ of temperature \lparen\degree C\rparen}}\end{cases},[/tex]Now, we have to replace the given data in the formula, where q = 8980 J, m = 200 g and ΔT = Final temperature - Initial temperature = 120 °C - 20 °C = 100 °C:
[tex]c=\frac{8980\text{ J}}{200\text{ g}\cdot100\degree C}=0.449\frac{J}{g\degree C}.[/tex]The specific heat of iron is 0.449 J/g°C.
What is the correct electron configuration for Si atomic number
O A. 1s22s22p 3s23p²
OB. 1s22s22p 3s²3p³
O C. 1s22s22p63s²2d³
O D. 1s22s22p63s¹3p³
1s22s22p63s^13p^3 is correct electron configuration for SI atomic number.
What is electron configuration?
The distribution of electrons in an element's atomic orbitals is described by the element's electron configuration. Atomic electron configurations adhere to a standard notation in which all atomic subshells that contain electrons are arranged in a sequence with the number of electrons they each hold written in superscript. For instance, sodium's electron configuration is 1s22s22p63s1. Long electron configurations are frequently produced by the standard notation. In these circumstances, a shortened or condensed version of the standard notation may be used. The sequence of fully filled subshells that represent the electronic configuration of a noble gas are replaced in the abbreviated notation by the symbol for that noble gas enclosed in square brackets.
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According to the beer-lambert law, what happens to the absorbance value of a light-absorbing chemical when its concentration increases?.
According to the beer-lambert law when its concentration increases so does the absorbance increase.
beer-lambert law states that the amount of energy absorbed or transferred by a solution is proportional to the molar absorptivity of the solution and the concentration of the solute.
This means that concentrated solutions absorb more light than dilute solutions.
so the According to the beer-lambert law concentration increases, so does the absorbance. Therefore, absorbance is directly proportional to concentration.
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a 100.0 ml sample of 0.18 m hclo4 is titrated with 0.27 m lioh. determine the ph of the solution after the addition of 50.0 ml of lioh.
The pH of the solution after addition of 50.0ml is 0.1003
pH is known as the negative logarithm of the hydrogen ion concentration in a solution.
In the given condition we have 100 ml of sample of 0.18 molar of HclO4 titrated with 0.27m LioH.
pH = log[H+]
= log [Hclo4]
Mole of Hclo4 0.1 L * 0.18 m = 0.018 M
mol LiOH = 0.1 L * 0.27 m = 0.027 M
total volume = 0.1L + 0.1L = 0.2L
HClO4] = (0.018-0.0081) /0.2 L
= -1.26 billion
PH = -㏒ -1.26
= 0.1003
So, the pH of the solution after adding 100 ml of liquid is 0.1003
Describe how a state function depends on the pathway between the initial and final states of a system.
A state function only depends on the thermodynamic system's starting and current states.
What exactly is a "thermodynamic system"?A thermodynamic system is a collection of objects or a significant region of space. The surroundings or mass outside the system is referred to as such, and the border is the region separating the two.
For instance, if we are examining a car engine, the thermodynamic system is the gasoline burning inside the engine's cylinder, and the system's surrounds are the radiator, exhaust system, piston, and outside air. The inner surfaces of the cylinder and piston then form the boundary.
The cosmos is made up of the system and its surroundings. Thermodynamic systems can be classified as open, closed, or isolated. With its surroundings, an open system can interchange both matter and energy. Since heat and water vapor can be lost to the air, the stovetop example would be considered an open system.
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Which transition of an electron in the hydrogen atom emits a photon with the smallest amount of energy?.
E3 is least transition of an electron in the hydrogen atom emits a photon with the smallest amount of energy.
A hydrogen atom is an atom belonging to the element hydrogen in chemistry. One positively charged proton and one negatively charged electron are both present in the electrically neutral atom and are held to the nucleus by the Coulomb force. Normal circumstances are infrequent for lone neutral hydrogen atoms. Hydrogen atoms can also exist in cationic and anionic states, however neutral hydrogen is frequently seen when it is covalently joined to another atom.
Energy is the quantifiable attribute that is transferred to a body or a physical system in physics. It is observable in the production of work as well as in the form of heat and light. The law of conservation of energy asserts that although energy can be changed in form, it cannot be created or destroyed. Energy is a conserved quantity.
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What type of mechanical mixture is pop
6. You have 400 mL of a 6 M solution of Ca(NO3)2. How many grams are present?
We are given the liters and molarity of the solution. To find grams we must take into account the definition of molarity. Molarity is defined as:
[tex]Molarity=\frac{MolesSolute}{Lsolution}[/tex]Now, we find the moles of solute:
[tex]\begin{gathered} MolesSolute=Molarity\times Lsolution \\ MolesSolute=6M\times400mL\times\frac{1L}{1000mL} \\ MolesSolute=6\frac{mol}{L}\times0.400L=2.4mol \end{gathered}[/tex]Now, to convert these moles to grams we must multiply the moles by the molar mass of Ca(NO3)2. Molar mass Ca(NO3)2 is 164.10g/mol.
So, the grams will be:
[tex]\begin{gathered} gCa(NO_3)_2=givenmolCa(NO_3)_2\times\frac{MolarMass,gCa(NO_3)_2}{1molCa(NO_3)_2} \\ gCa(NO_3)_2=2.4molCa(NO_3)_2\times\frac{164.10gCa(NO_3)_2}{1molCa(NO_3)_2} \\ gCa(NO_3)_2=394gCa(NO_3)_2 \end{gathered}[/tex]Answer: There are present 394grams of Ca(NO3)2