The internal energy of a human body is the net energy contained in the body due motion of its particle or molecules.
In a human body the internal energy is stored . It increases when the temperature of the body rises, or when the body observes some changes. Internal energy we can say that is the sum of kinetic and potential energy of all particles in the body.
Internal energy is a state function of a system and is an extensive quantity. Every substance possesses a fixed quantity of energy which depends upon its chemical nature and also on its state of existence. Every substance have a definite value of Internal energy.
The change in the Internal energy of a reaction may be considered as the difference between the internal energies of the two states.
ΔU = [tex]E_{B}[/tex] - [tex]E_{A}[/tex] where [tex]E_{B}[/tex] and [tex]E_{A}[/tex] are the initial energies of states A and B. Or we can also write the equation as:
ΔU = ΔE
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A sample of gas is placed in a 25.0 L sealed container at STP. The
container is heated to 25 C. What will be the pressure in the container?
The pressure of a sample of gas placed in a 25.0L container at STP is 0.98atm.
How to calculate pressure?The pressure of an ideal gas can be calculated by using the following formula:
PV = nRT
Where;
P = pressureV = volume n = number of molesT = temperatureR = gas law constantAccording to this question, a sample of gas is placed in a 25.0 L sealed container at STP. The container is heated to 25°C. The pressure in the container is as follows:
P × 25 = 1 × 0.0821 × 298
25P = 24.47
P = 0.98atm
Therefore, 0.98atm is the pressure of the gas
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Read the chemical equation shown.
3SO2 + 2HNO3 + 2H₂O → 3H₂SO4 + 2NO
Which statement is true about this chemical equation?
OH (hydrogen) was oxidized and S (sulfur) was reduced.
OH (hydrogen) was reduced and N (nitrogen) was oxidized.
OS (sulfur) was oxidized and N (nitrogen) was reduced.
OS (sulfur) was reduced and N (nitrogen) was oxidized.
The statement "OH (hydrogen) was oxidized and S (sulfur) was reduced" is true about this chemical equation.
This chemical reaction is between Sulfur dioxide and nitric acid along with water. When nitric acid reacts with Sulfur dioxide, it gives sulfuric acid and nitrogen monoxide.
In the reaction, the hydrogen atoms in H₂O are oxidized to form H₂SO₄, and the sulfur atoms in SO₂ are reduced to form H₂SO₄.
Therefore, the OH from the water molecule gets oxidized to give out Sulfuric acid. Likewise, the Sulfur from Sulfur dioxide reduces to form the product that is sulfuric acid.
Therefore, the best option that suits the reaction is OH (hydrogen) was oxidized and S (sulfur) was reduced.
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Answer:
I believe the above answer is correct after my test i will let everyone know.
Explanation:
a beam of electrons,neutrons and protons can be separated by passing them through an electric field.
Which direction does each particle follow?
Answer:
the protons go in the direction of C, the electrons go in the direction of A and neutrons go the direction of B.
Explanation:
this is because electrons get attracted to positively charged objects and protons get attracted to negatively charged objects and neutrons have no attraction towards any charge.
Calculate the molarity of 25.7 g of MgS in 919 mL of solution.
What do you mean by molarity?
Molarity-Molarity is a term that is used to show concentration of the solution . It is different from molality as it is expressed in mol per L , whereas molality is expressed in mol per kg.
Given:
Mass of Mgs is 25.7 g.Volume of the solution is 919 ml.The mole of Mgs is calculated as follows :
Mole= Mass / Molar Mass
= 25.7g/56.38 g/mol
= 0.455 mol.
The molarity of Mgs solution is calculated as follows :-
Molarity =Mole/Volume ( L )
=0.455mol/919ml* 1000ml/1L
=0.495M
Thus, the molarity of the solution is 0.495 M.
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Which description of the atoms resulted from this experiment
Option D, A small, positive nucleus is mostly empty.
Rutherford's atomic version is the version which defined the atom as a tiny, dense, undoubtedly charged middle referred to as a nucleus, wherein almost all of the mass is focused, round which the light, bad constituents, referred to as electrons, flow into at a few distance, just like planets revolving across the Sun.
What is the Rutherford gold-foil test, A piece of gold foil became hit with alpha debris, that have a fantastic charge. Most alpha debris went proper through. This confirmed that the gold atoms had been normally empty space.
The 3 fundamental observations of the test had been: Most of the distance within the atom is empty. All the fantastic costs are focused in a completely small vicinity in the atom, referred to as the nucleus. The nucleus's length may be very small as compared to the scale of the atom.
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Name one thing that we use in everyday life that uses either a magnetic field or an electric field.
A common thing in everyday life that uses the magnetic field or an electric field is the transformer.
What is a magnetic field?The term magnetic field is the region that is around a magnet where there is a the influence of a magnetic. Also, the region around a charge where the influence of the charge can be felt is called the electric field.
Most of the devices that we have at home do have a transformer such as a radio set and a television set. The transformer that is in this appliance causes the regulation of voltage in the appliance.
The transformer works on the principle of the magnetic field and the electric field.
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While bowling, Sean stands 19 meters away from the pins and throws his bowling ball down the lane. The ball rolls at a constant velocity of 7.2meterspersecond toward the pins. How far will the ball roll in 2.5seconds?
If 2.186×10-2 mol of NH3 gas has a volume of 365 mL at 32°C, what would be the volume of 2.186×10-2 mol of N2 gas under identical temperature and pressure conditions?
The volume of the 2.186×10⁻² mole of N₂ gas under identical temperature and pressure conditions will also be 365 mL
How do I determine the volume of N₂?We'll begin by obtaining the pressure of NH₃. This can be obtained by using the ideal gas equation as illustrated below:
Mole of NH₃ (n) = 2.186×10⁻² moleVolume (V) = 365 ml = 365 / 1000 = 0.365 L Temperature (T) = 32 °C = 32 + 273 = 305 KGas constant (R) = 0.0821 atm.L/Kmol Pressure (P) = ?PV = nRT
Divide both sides by V
P = nRT / V
P = (2.186×10⁻² × 0.0821 × 305) / 0.365
P = 1.5 atm
Finally, we shall determine the volume of the N₂ under identical (i.e the same) temperature and pressure conditions. This is illustrated below:
Mole of N₂ (n) = 2.186×10⁻² moleTemperature (T) = 32 °C = 32 + 273 = 305 KPressure (P) = 1.5 atm Gas constant (R) = 0.0821 atm.L/Kmol Volume (V) = ?PV = nRT
Divide both sides by P
V = nRT / P
V = (2.186×10⁻² × 0.0821 × 305) / 1.5
V = 0.365 L
Multiply by 1000 to express in liters
V = 0.365 × 1000
V = 365 mL
Thus, the volume is 365 mL
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Which element would be expected to have properties similar to antimony
Answer:
N, P, As, Bi, Mc
Explanation:
Similar chemical properties are usually found within the same column of the periodic table.
Antimony is Sb, which is in column 15.
Therefore all the elements in column 15, including N, P, As, Bi, Mc, should have similar chemical properties
4) Why must the exact same mass of solution (100.0 g) be used in the neutralization reactions?
Answer:for making the text look colored and bold
Explanation:It can reacting differently with different mass solution, it also depends on what concentration you're measuring, and what reaction
hcn is classified as a weak acid in water.this means that it produces
HCN is classified as a weak acid because it partially ionizes in water to produce hydrogen ions as the only positive ion.
What is an acid?There are several definitions for acids.
It is a substance that turns blue litmus paper to red when wet.It is any substance whose pH lies between 0 and 7.It is a substance that when ionizes in water, produces hydrogen ions as the only positive ion.HCN ionizes in water according to the following equation:
[tex]HCN < --- > H^+ + CN^-[/tex]
Because the HCN is only partially ionized and not a complete ionization, it is said to be a weak acid because hydrogen ion is still formed as the only positive ion.
Strong acids produce hydrogen ions as their only positive ions but are completely ionized in water, unlike weak acids.
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Calculate the volume (mL) of a 2.50M NaOH solution are required to make 725 mL of a 0.150M NaOH solution?
The volume of a 2.50M NaOH solution required to make 725 mL of a 0.150M NaOH solution is 43.5mL.
How to calculate volume of a solution?The volume of a solution can be calculated using the following expression:
CaVa = CbVb
Where;
Ca = initial concentrationCb = final concentrationVa = initial volumeVb = final volumeMolarity is the concentration of a substance in solution, expressed as the number moles of solute per litre of solution.
According to this question, 2.50M NaOH solution are required to make 725 mL of a 0.150M NaOH solution. The volume required can be calculated as follows:
2.5 × Va = 725 × 0.150
2.5Va = 108.75
Va = 43.5mL
Therefore, 43.5mL is the volume of the solution.
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Which of the following is an example of an unbalanced force?
A A computer on a table
B A man leaning against a wall
C A girl serving a volleyball
D Fruit in a bowl
Explanation:
C
as the girl applies a resultant force on the volleyball causing it to accelerate, there's an unbalanced force acting on the ball.
A known reaction has Change in U= 38 kJ/mol. The reaction is done at constant pressure and you measure the amount
of work done to be w=+2 kJ/mol. What is q in kJ/mol?
q = 36kJ/ mol amount of heat is produced according to 1st law of Thermodynamics
What is 1st law of Thermodynamics ?
The first law of thermodynamics states that energy is neither created nor destroyed, only its form can be changed. In any system, energy transfer involves exceeding control limits by mass, external work, or heat transfer beyond limits. These cause changes in the stored energy within the control volume.
The first law of thermodynamics states that heat is a form of energy and therefore thermodynamic processes obey the law of conservation of energy. This means that it cannot generate or destroy thermal energy.
ΔU = q + w
38kJ/ mol = q + 2kJ/mol = 36kJ/mol
q = 36kJ/ mol amount of heat is produced according to 1st law of Thermodynamics
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please help me with it
Explanation:
I can't see the questions!!
Which process uses the most water in the United States?
public use
irrigation
industry
power plants
The most water in the United States is used power plants (thermoelectric power)
What are thermoelectric power plants ?
Water flowing through the boiler's network of pipes is heated, turning it into steam. A shaft connecting a turbine to a generator rotates the blades of a turbine powered by high-pressure steam. As the generator turns, electricity is generated. The thermoelectric power of a given metal is that of a couple made of that metal with lead, with the thermoelectric power of lead being arbitrarily regarded as zero. Rate of change of the thermoelectromotive force of a thermocouple with temperature.
Industrial water withdrawals make up just 5% of all water withdrawals in the US, but thermoelectric power draws make up 49% of all withdrawals. About 12% of the public water supply is also used by industrial and manufacturing companies.
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a carbon is found to form two oxide, which contain 42.9% and 27.3%carbon respectively, show that these figure illustrate the law multiple proportional
The empirical formulas of the two oxides are CO and [tex]CO_2[/tex] respectively. Thus, the figures illustrate the law of multiple proportions.
Law of multiple proportionsThe law of multiple proportions states that when two elements form more than one compound, the ratios of the masses of the second element which combine with a fixed mass of the first element will always be ratios of small whole numbers.
Now, let's see if the figures quoted in the problem obey this law:
The first oxide:
C = 42.9
O = 100-42.9
= 57.1
The equivalent mole of each atom would be:
C = 42.9/12
= 3.56
O = 57.1/16
= 3.56
Thus, the empirical formula of the first oxide is CO.
The second oxide:
C = 27.3
O = 100 - 27.3
= 72.7
The equivalent mole of each atom will be:
C = 27.3/12
= 2.27
O = 72.7/16
= 4.54
Dividing the moles by the smallest mole
C = 2.27/2.27
= 1
O = 4.54/2.27
= 2
Thus, the empirical formula of the second oxide is [tex]CO_2[/tex].
In other words, the figures quoted obeys the law of multiple proportions.
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Of the following transitions in the Bohr hydrogen atom, the ________ transition results in the absorption of the highest-energy photon.
Of the following transitions in the Bohr hydrogen atom, the ________ transition results in the absorption of the highest-energy photon.
n = 7 → n = 4
n = 3 → n = 5
n = 3 → n = 2
n = 6 → n = 3
The highest energy transition in the hydrogen atom among the following is from n=6 to n=3. Hence option d is correct.
What is Bohr model?Bohr model of atom proposed the modern atomic model based on the interpretations from quantum mechanics. According to this model, electrons are revolving around the atom through circular paths of fixed energy.
The energy of the se levels and the momentum of electrons can be determined using Bohr's equation. Electrons can transit between these energy levels. The Rydberg formula for the transition is written as follows:
[tex]\frac{1}{\lambda} = R [\frac{1}{n_{1}^2} -\frac{1}{n_{2}^2} ][/tex]
Here, R is the Rydberg constant and n1 and n2 be the first and second energy levels.
The transition n=6 to n=3 gives the higher value for this equation. Hence, this transition results highest energy absorption.
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In the lac operon how do multiple proteins form from the same mRNA? due to RNA splicing due to high
due to high functioning spliceosome due to multiple start and stop codons
due to presence of operator sequences
In the Lac operon, multiple proteins form from the same mRNA due to RNA splicing.
What is an operon?An operon is a cluster of genes that are transcribed from the same promoter to give a single messenger RNA (mRNA) molecule that contains multiple coding sequences that are used to make multiple proteins.
Such an mRNA molecule is called a polycistronic mRNA.
An example of an operon is the Lac operon which encodes the genes used to produce the various enzymes required for the metabolism of lactose.
Three of the enzymes in the lac operon are grouped together and are known as lacZ, lacY, and lacA.
Alternative splicing of the mRNA produces the different proteins in operons.
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17. 1s² 2s² 2p 3s² 3p6 4s² 3d¹0 4p65s¹ symbol?
Hi, can someone please help me find out what the compound names are for each of these.. thank you!! kindly appreciate it (:
The organic nomenclature of the condensed structural compound is 1. Octane.
1. Octane
2. But - 2- ene
3. ethylene
4. Penatne
5. But - 2 - yne
6. hept 1 - yne
7. Hexx-2 - ene
8. But -1 - yne
In chemical nomenclature, the IUPAC nomenclature of organic chemistry is a method of naming natural chemical compounds as recommended by using the global Union of natural and applied Chemistry. it is posted inside the Nomenclature of Organic Chemistry.
The name of the organic compound is written out with the substituents in alphabetical order observed via the bottom call (derived from the wide variety of carbons in the discern chain). Commas are used among numbers and dashes are used between letters and numbers. There are no spaces inside the call.
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A single molecule of water contains 1 oxygen atom and 2 hydrogen atoms
- 1 mole of H2O
How many molecules and how many atoms?
What is the pH of 3.9 M potassium fluoride?
Round your answer to 2 decimal places.
The pH of the 3.9M of pottasium fluoride is 0.591.
How to calculate pH?pH of a solution can be described as the figure expressing the acidity or alkalinity of a solution on a logarithmic scale on which 7 is neutral, lower values are more acid and higher values more alkaline.
The pH of a solution can be calculated by using the following expression:
pH = -log {H}
Where;
H = hydrogen ion concentrationAccording to this question, a 3.9 M potassium fluoride is given. The pH can be calculated as follows:
pH = - log {3.9}
pH = -0.591
Therefore, the pH of the solution is 0.591
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a sample of an unknown gas has a volume of 8.00L at 1.00 atm and 25.0°C. How many moles of gas are present? please explain in full detail so i can learn it
0.33 mol is the amount of the unknown gas present.
What amount of moles of the gas is present?The ideal gas law states that "the pressure multiplied by volume is equal to moles multiply by the universal gas constant multiply by temperature.
It is expressed as;
P × V = n × R × T
Where P is pressure, V is volume, n is the amount of substance, T is temperature and R is the ideal gas constant ( 0.08206 Latm/molK ).
Given the data in the question;
Volume of gas V = 8.00lPressure P = 1.00atmTemperature T = 25°C = ( 25 + 273.15 )K = 298.15KAmount of gas n = ?Plug the given values into the ideal gas law formula and solve for n ( amount of gas in moles ).
P × V = n × R × T
n = ( P × V ) / ( R × T )
n = ( 1.00atm × 8.00L ) / ( 0.08206Latm/molK × 298.15K )
n = 8.00Latm / 24.466189Latm/mol
n = 0.33 mol.
Therefore, the amount of gas is 0.33 mol.
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Which functional groups are present in carbohydrates?
alkenes, alkynes, and phenyl groups
ethers, esters, and amides
carboxylic acids and amino groups
aldehydes, ketones, and hydroxyl groups
The functional groups are present in the carbohydrates is aldehydes , ketone , and hydroxyl groups.
Carbohydrates are the essential for living thing . they provide energy to living things. simple carbohydrates are : monosaccharides , disaccharides, oligosaccharides. Carbohydrates involves in fat metabolism. carbohydrates are also called as starch , simple sugars etc. carbohydrates found in foods . sugar is a source of carbohydrates. there are good carbohydrates which is high in nutrients moderate in calories. the bad carbohydrates are low in nutrients and high in calories.
Thus, The functional groups are present in the carbohydrates is aldehydes , ketone , and hydroxyl groups.
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When chromium changes from an oxidation state of +3 to that of +6, the Cr3+ must:
A. gain 6 electrons B. lose 6 electrons
C. lose 3 electrons D. gain 3 electrons
When chromium changes from an oxidation state of +3 to that of +6, the Cr3+ must: lose 3 electrons.
So option C is correct.
What is an oxidation state?
The oxidation state or oxidation number, is the hypothetical charge of an atom if all of its bonds to different atoms were fully ionic which describes the degree of oxidation of an atom in a chemical compound. In any concept, the oxidation state may be positive, negative or zero.
When chromium changes from an oxidation state of +3 to + 6 it loses 3 electrons during the process. For example oxidation state of elemental atoms such as sodium, magnesium, iron is zero.
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I need to know what’s the answer for the check point question on the picture. please help me.
In the combustion of methane the are reactants are CH₄(g) and O₂(g). The products are CO₂(g) and H₂O(g) .
Combustion is process in which the substance react with the oxygen to produce heat. In the combustion of , the methane , CH₄ is burnt in the presence of oxygen, O₂ produce carbon dioxide, CO₂ and water H₂O. it is very useful as fuel source. the chemical reaction is given as follows :
CH₄(g) + 2O₂(g) ----> CO₂(g) + 2H₂O(g) . + heat + light
Thus, In the combustion of methane the are reactants are CH₄(g) and O₂(g). The products are CO₂(g) and H₂O(g).
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What does atomic number describe?
Responses
mass
mass
number of protons
number of protons
number of neutrons
number of neutrons
atomic weight
Answer:
Number of protons in the nucleus of an atom
what is manforce ????
Answer:
Explanation:
Manforce is a type of prescription in medical purposes used to treat erectile dysfunction for men. It usually comes in 100 mg tablets with price varying from 250- 350. It increases the blood flow within the person to maintain a erection in men.
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When 15.6 mL of 0.500 M Silver (1) Nitrate is added to 12.5 mL of 0.300 M
Ammonium chloride, how many grams of solid product (if any) formed?
Select one:
A. 0.537 g
B. 1.65 gx
C. NR
D. 1.11 g
The grams of solid product is 0.537 g.
Hence, Option A is correct.
The above equation can be solved by
The Symbol Ag used for Silver originates from the Latin word “Argentum
AgNO3 + NH4Cl ? AgCl + NH4NO3
(15.6 mL) x (0.500 M AgNO3) = 7.8 m mol AgNO3
(12.5 mL) x (0.300 M NH4Cl) = 3.75 m mol NH4Cl
7.8 m mol AgNO would react completely with 7.8 x (1/1) = 7.8 mol NH4Cl, but there is not that much NH4Cl present, so NH4Cl is the limiting reactant.
(3.75 m mol NH4Cl) / (1000 m mol/mol) x (1/1) x (143.3214 g AgCl/mol) = 0.537 g AgCl.
Hence, The grams of solid product is 0.537 g.
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