A 475 cm3 sample of gas at standard temperature and pressure is allowed to expand until it occupies a
volume of 600. cm3. What temperature would be needed to return the gas to standard pressure?
Answers
The final temperature : 345 K
Further explanationGiven
475 cm³ initial volume
600 cm³ final volume
Required
The final temperature
Solution
At standard temperature and pressure , T = 273 K and 1 atm
Charles's Law :
When the gas pressure is kept constant, the gas volume is proportional to the temperature
V₁/T₁=V₂/T₂
Input the value :
T₂=(V₂T₁)/V₁
T₂=(600 x 273)/475
T₂=345 K
Related Questions
why is P4S3 a covalent bond?
Answers
Answer:
Phosphorus sesquisulfide, free from yellow and white phosphorus appears as a yellow crystalline solid. Easily ignited by friction. Forms sulfur dioxide and phosphorus pentaoxide during combustion. Reacts with water to form phosphoric acid, a corrosive material. Used to make matches and in the manufacture of other chemicals.
Explanation:
what is not true about a peptide bond? group of answer choices it has a planar structure because of partial double bonding. it can pick up a proton to carry a net positive charge it is a type of amide bond it has a carbonyl group linked to a nitrogen atom it resonates between single and double bonds (exists as a hybrid)
Answers
The statement that is not true about a peptide bond is that it can pick up a proton to carry a net positive charge. Peptide bonds do not readily pick up protons or exhibit a net positive charge under physiological conditions.
A peptide bond is a covalent bond formed between the carboxyl group of one amino acid and the amino group of another amino acid during protein synthesis. The peptide bond is a type of amide bond, where the carbonyl group of one amino acid is linked to the nitrogen atom of another amino acid.
This bond is planar and exhibits partial double bonding characteristics, resulting in restricted rotation around the bond. This planar structure is due to resonance between the single and double bond forms of the peptide bond, forming a resonance hybrid.
However, peptide bonds do not typically pick up protons to carry a net positive charge. In physiological conditions, peptides and proteins remain primarily in their unprotonated or neutral state, with the charges on the amino acid side chains determining the overall charge of the molecule. Peptide bonds themselves do not readily accept protons or contribute to the net positive charge of the molecule.
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ideally, the molar volume of a gas is 22.414 l at 1 atm and 25°c.
Answers
The statement is incorrect. The molar volume of an ideal gas is 22.414 L at 1 atm and 0°C (or 273.15 K), not 25°C. This value is known as the molar volume at standard temperature and pressure (STP).
At STP, one mole of an ideal gas occupies 22.414 L of volume. It is a useful value for performing calculations involving gases, such as determining the volume of a given number of moles of gas or calculating the number of moles of gas based on its volume. However, it is important to note that the molar volume of a gas can vary with different temperature and pressure conditions. The molar volume of a gas refers to the volume occupied by one mole of the gas under specific conditions of temperature and pressure. The molar volume is dependent on the temperature, pressure, and the nature of the gas.
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select all the dibasic bases from the following list. multiple select question. sr(oh)2 ca(oh)2 nh2oh
Answers
Dibasic bases split into two OH- ions.
What is dibasic acid?
A dibasic acid is one that, when reacting with a base, can release two positively charged hydrogen ions, as well as protons. Diprotic acid is a more recent name for this kind of acid. Normally, an acid and a base will react to create salt and water. When the negative charges hydroxide ion from the base reacts with the positively charged hydrogen ion from of the acid, the result is water: H+ + OH- H2O. Two types of salt can be created from the two hydrogen atoms in a dibasic acid molecule, one of which is an acid salt with a hydrogen atom. One of the most well-known and frequently used acids is sulfuric acid, which is a good illustration of a dibasic acid.
Hence, the answer is Sr(OH)2 and Ca(OH)2.
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does adding acid make a solution more acidic or basic
Answers
Answer:
Adding an acid increases the concentration of H3O+ ions in the solution. Adding a base decreases the concentration of H3O+ ions in the solution. An acid and a base are like chemical opposites. If a base is added to an acidic solution, the solution becomes less acidic and moves toward the middle of the pH scale.
o facilitate ease of dose calculations for cefazolin injection, your department policy
states that the resulting concentration after reconstitution should be 100 mg/mL. The
packaging insert for cefazolin 1-g vial instructs you to add 3.4 mL of sterile water without
bacteriostat, resulting in a reconstituted solution of 250 mg/mL
i. What is the final volume of the reconstituted cefazolin solution?
A 3 mL
B. 4 mL
C. 5 mL
D. 2.5 mL
ii. What is the volume of the cefazolin powder?
A 0.4 mL
B. mL
C. 0.7 mL
D. 0.6 mL
iii. What is the final volume of the 100mg/mL cefazolin solution?
A. 6 mL
B. 8 mL
C. 7 mL
D. 10 mL
Answers
The final volume of the reconstituted cefazolin solution is 4 mL. The volume of the cefazolin powder is 0.6 mL. The final volume of the 100 mg/mL cefazolin solution is 10 mL.
The packaging insert instructs to add 3.4 mL of sterile water without bacteriostat to the 1-g vial of cefazolin. This results in a reconstituted solution with a concentration of 250 mg/mL.
To find the final volume, we can set up the equation:
Concentration of reconstituted solution = Amount of drug / Final volume
Using the given concentration (250 mg/mL) and the amount of drug (1 g = 1000 mg), we can rearrange the equation to find the final volume:
250 mg/mL = 1000 mg / Final volume
Solving for the final volume:
Final volume = 1000 mg / 250 mg/mL = 4 mL
Therefore, the final volume of the reconstituted cefazolin solution is 4 mL.
To find the volume of the cefazolin powder, we need to subtract the volume of sterile water added from the final volume of the reconstituted solution.
Given that 3.4 mL of sterile water is added to the vial, and the final volume of the reconstituted solution is 4 mL, we can calculate the volume of the cefazolin powder as follows:
Volume of cefazolin powder = Final volume - Volume of sterile water added
Volume of cefazolin powder = 4 mL - 3.4 mL = 0.6 mL
Therefore, the volume of the cefazolin powder is 0.6 mL.
To determine the final volume of the 100 mg/mL cefazolin solution, we can use the concentration and the amount of drug.
We are given that the resulting concentration after reconstitution should be 100 mg/mL. Considering the amount of drug is 1 g (1000 mg), we can set up the following equation:
Concentration of reconstituted solution = Amount of drug / Final volume
Using the given concentration (100 mg/mL) and the amount of drug (1000 mg), we can rearrange the equation to find the final volume:
100 mg/mL = 1000 mg / Final volume
Solving for the final volume:
Final volume = 1000 mg / 100 mg/mL
Final volume = 10 mL
Therefore, the final volume of the 100 mg/mL cefazolin solution is 10 mL.
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El carbono de calcio se descompone por la acción del calor en óxido de calcio y dióxido de carbono. a). Escribe la ecuación química ajustada. b). Calcula qué cantidad de dióxido de carbona se forma si reaccionan 150g de carbonato de calcio.
Answers
Respuesta:
1.50 moles
Explicación:
Paso 1: Escribir la ecuación química ajustada para la descomposición del carbonato de calcio
CaCO₃ ⇒ CaO + CO₂
Paso 2: Calcular los moles correspondientes a 150 g de CaCO₃
La masa molar de CaCO₃ es 100.09 g/mol.
150 g × 1 mol/100.09 g = 1.50 mol
Paso 3: Calcular los moles de CO₂ producidos a partir de 1.50 moles de CaCO₃
La relación molar de CaCO₃ a CO₂ es 1:1.
1.50 mol CaCO₃ × 1 mol CO₂/1 mol CaCO₃ = 1.50 mol CO₂
What is the ability to do work or produce heat?
Answers
Answer: Energy
Explanation:
Energy is the ability to do work or produce heat.
2.1 x 10^-3 x 2 x 10^2 =
a)
4.2 x 10^-5
b)
4.2 x 10^-1
c)
4.2 x 10^1
d)
4.2 x 10^-6
Answers
Answer:
I believe it is B
Explanation:
hope it helps. please let me know if it's wrong
What is the trend in the ionic charges of the elements in groups 1, 2 and 13 of the periodic table (I will be giving brainliest to whoever gives the best answer and explains it)
Answers
Group 1: 1+
Group 2: 2+
Group 13: 3+
Explanation:The charges of the ions are dependent on the number of valence electrons.
Valence Electrons
Group 1 has 1 valence electron, group 2 has 2, and group 13 has 3. It is important to remember that elements will attempt to have a full valence shell. They may either attempt to lose all of their valence electrons or fill the energy level with 8 electrons.
Since all of these groups have less than 4 valence electrons, they will attempt to lose their valence electrons.
Determining Charges
When atoms lose electrons, they gain a positive charge. Since all of these elements will lose electrons, all of the ions will be positive, also known as a cation.
The positive charge of an element is equal to the number of electrons the atom loses. This means that group 1 will have a 1+ charge because it loses 1 electron. Continue this pattern to determine that group 2 will have a 2+ charge and group 13 will have a 3+ charge.
PLEASE HELP THIS IS DUE SOON!
1. True/False: Oxygen and chlorine combined are not a compound, but a molecule.
2. True/False: H2O is a compound.
Answers
Answer: number 1 is true number 2 is false
Explanation:
Identify the option below that is FALSE about homogeneous catalysts.
Select the correct answer below:
A. They are present in the same phase as the reactants.
B. They are always regenerated by the end of the reaction.
C. An example of a homogeneous catalyst is a layer of carbon (graphite) providing a reactive surface for an all-gas reaction.
D. They typically interact with reactants to form intermediates, which eventually react away to regenerate the catalyst.
Answers
Answer: The false statement about homogeneous catalysts is:
C. An example of a homogeneous catalyst is a layer of carbon (graphite) providing a reactive surface for an all-gas reaction.
Explanation:
Homogeneous catalysts are catalysts that are present in the same phase as the reactants, option A. They typically interact with reactants to form intermediates, which eventually react away to regenerate the catalyst, option D. However, option C is false because a layer of carbon (graphite) providing a reactive surface for an all-gas reaction would be an example of a heterogeneous catalyst, not a homogeneous catalyst. Heterogeneous catalysts are present in a different phase than the reactants.
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The false statement about homogeneous catalysts is:
C. An example of a homogeneous catalyst is a layer of carbon (graphite) providing a reactive surface for an all-gas reaction.
Homogeneous catalysts are catalysts that are present in the same phase as the reactants, option A. They typically interact with reactants to form intermediates, which eventually react away to regenerate the catalyst, option D. However, option C is false because a layer of carbon (graphite) providing a reactive surface for an all-gas reaction would be an example of a heterogeneous catalyst, not a homogeneous catalyst. Heterogeneous catalysts are present in a different phase than the reactants.
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Question 10 (4 points)
(03.04 LC)
What is the attraction between atoms when they react called? (4 points)
а
Chemical bond
b
Chemical compound
c
Chemical element
d
Chemical formula
Answers
The forces that hold atoms make compounds and molecules
Answer:
A is correct
hope it helps
Explanation:
How do you express a number in scientific notation?
A. Write the number as a fraction in a scientific equation
B. Write the number along with the units associated with it
C. Write the number in units of Avogadro's number
D. Write the number as a decimal multiplied by a power of 10
SUBMIT
Answers
What biological molecule that is used for energy is represented by the structure below?
Answers
Answer:
Glucose. C6H12O6
Explanation:
In aerobic respiration glucose generate ATP. Which are the source of energy.
what are plasmas properties?
Answers
Answer:Plasma is highest energy state of matter.It consists of electrons,protons and neutral particles.
Explanation:(1) Plasma has a very high electrical conductivity .
(2) The motion of electrons and ions in plasma produces it's own electric and magnetic field
(3)It is readily influenced by electric and magnetic fields .
(4)It produces it's on electromagnetic radiations.
While traveling abroad in Africa you observe a large number of people with goiter (enlarged thyroid). Which mineral deficiency could be responsible for this? iodine iron chromium fluorine
Answers
The cultures of prehistoric humans are known mostly through the excavation of stone tools and other relatively imperishable artifacts. The early tool making traditions are often referred to as being paleolithic (literally "Old Stone Age). The Oldowan and Acheulian tool traditions of the first humans were the simplest applied research basic research Scientihe thought O philosophies technologies
Answers
The cultures of prehistoric humans are primarily known through the excavation of stone tools and other durable artifacts, such as the Oldowan and Acheulian tool traditions.
Stone tools and imperishable artifacts serve as key archaeological evidence for understanding prehistoric cultures. Through meticulous excavation and analysis, archaeologists have been able to piece together the lifestyles, technological advancements, and social behaviors of early human societies. The term "paleolithic" refers to the Old Stone Age, a time when humans relied on stone tools as their primary implements.
The Oldowan tool tradition is considered the earliest stone tool industry, dating back around 2.6 million years ago. It is characterized by simple tools, such as choppers and scrapers, which were crafted by flaking off pieces from larger stones. These tools were primarily used for basic activities like butchering and processing animal carcasses.
Later, the Acheulian tool tradition emerged around 1.76 million years ago, representing an advancement in stone tool technology. Acheulian tools, such as handaxes and cleavers, were more refined and standardized, showcasing an increased level of sophistication in tool-making techniques. These tools served a wide range of purposes, including hunting, woodworking, and shaping raw materials.
By studying the Oldowan and Acheulian tool traditions, researchers gain valuable insights into the cognitive abilities, cultural development, and technological progress of early humans. The examination of these artifacts provides evidence of their adaptability, problem-solving skills, and the gradual refinement of their tool-making techniques over time.
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A slightly edited Exercise 6 of Chapter 4 (Page 90) states:
(a) Calculate the energy needed to bring a cup of water (about 250 g) from 10°C to the boiling point (100°C for water). Then, find the time it takes to heat this water (c) in a 1-kg aluminum pan sitting on a 1,500-W electric stove burner that transfers 75% of its energy output to the water and the pan. Assume the pan, too, starts at 10°C and has to be heated to water’s boiling point.
Solution:
(a) To heat just the water requires energy Qw=mwcwΔT (Equation 4.3), where ΔT=100∘C−10∘C=90∘C:
Qw=0.25kg(4184Jkg∘C)90∘C=94,140J
(c) On the stove, we also have to heat the pan. Aluminum’s specific heat is ca=900Jkg∘C , from table 4.3, (because this is lower than cw, it is easier to heat aluminum than water).
To heat just the aluminum pan requires energy, Qa=macaΔT=1kg(900Jkg∘C)90∘C.
The total energy to heat the pan of water on the stove is increased because of the finite efficiency:
Qtotal=Qw+Qaes=94,140J+81,000J0.75=233,520J
The time it takes to heat the water depends on the stove’s power: power = energy per time, so
t=energypower=QtotalPs=233,520J1,500Js=155.68or156sonthestove
Question:
Find the time, in seconds, it takes to heat this water in a 1-kg steel pan sitting on a 1,500-W electric stove burner that transfers 75% of its energy output to the water and the pan. Assume the pan, too, starts at 10°C and has to be heated to water’s boiling point. Round your answer to the nearest whole second.
Answers
The time it takes to heat this water in a 1-kg steel pan sitting on a 1,500-W electric stove burner that transfers 75% of its energy output to the water and the pan is 90 seconds (rounded to the nearest whole second).
We need to calculate the time taken to heat the water in a 1-kg steel pan sitting on a 1,500-W electric stove burner that transfers 75% of its energy output to the water and the pan. The given information are as follows:
Specific heat of water, cw = 4184 J/kg °C
Specific heat of steel, cs = 450 J/kg °C
Energy supplied by the electric stove burner, P = 1,500 W (75% of which is transferred to the water and the pan)
Mass of water, mw = 250 g = 0.25 kg
Mass of steel pan, ms = 1 kg
Initial temperature of water and steel pan, T1 = 10 °C
Final temperature of water and steel pan (boiling point of water), T2 = 100 °C
Heat absorbed by the steel pan = Qs = ms × cs × (T2 - T1)Heat absorbed by the water = Qw = mw × cw × (T2 - T1)
Total heat absorbed by the water and the pan = Q = Qw + Qs = (0.25 × 4184 × 90) + (1 × 450 × 90) J= 94,140 + 40,500 J= 1,34,640 J
Time taken to heat the water and the pan = t = Q/P= 1,34,640 / 1,500 s= 89.76 or 90 s
Therefore, the time it takes to heat this water in a 1-kg steel pan sitting on a 1,500-W electric stove burner that transfers 75% of its energy output to the water and the pan is 90 seconds (rounded to the nearest whole second).
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What is the correct formula for the product of the combination reaction between calcium metal and oxygen gas?.
Answers
Oxygen and calcium react to generate calcium oxide. The chemical made of calcium and oxygen has the formula CaO. This reaction's chemical formula is 2Ca + O2 2CaO.
What are the eight different kinds of chemical reactions?the eight types of chemical reactions that are most frequently encountered are: decomposition reaction, combination reaction, combustion reaction, single displacement reaction, double displacement reaction, precipitation reaction, and redox reaction.
What four traits do chemical reactions have?The evolution of a gas, precipitate formation, color change, temperature change, and state change are significant aspects.
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Evaluate the volume of the object as
determined by water displacement.
Measurement 1 (water only) = 9.15 mL
Measurement 2 (water + object) = 19.20 mL
Volume = [?] mL
Answers
Answer:
Explanation: 10.05 mL
To determine the volume of the object using water displacement, we subtract the initial volume (measurement 1) from the final volume (measurement 2).
Volume = Measurement 2 - Measurement 1
Volume = 19.20 mL - 9.15 mL
Volume = 10.05 mL
Therefore, the volume of the object, as determined by water displacement, is 10.05 mL.
Using the following equation
2C2H6 +7O2 -->4CO2 +6H2O
How many grams of C2H6 are formed from 9.5 moles of CO2 gas?
Answers
30.06904 grams of C2H6 are formed from 9.5 moles of CO2 gas.
How to find number of moles?
In the International System of Units, the mole is the unit of substance amount. A mole of a substance is defined as a mass of material that contains exactly 12,000 g of 12C's exact number of atoms as fundamental units. One mole has 600 sextillion molecules. While employing the mole, complicated calculations are more easily understandable. To get the number of moles, divide the compound's known mass by its molar mass. Consider a scenario where your sample of Na2SO4 weighs 20 g. 20 grammes divided by 142 grammes per mole yields 0.141 moles.
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what is the atomic mass [A] of sulphuric acid please write in fine English
Answers
Answer:
98 g/mol
Explanation:
atomic mass for hydrogen=1
atomic mass for sulphur=32
atomic mass for oxygen=16
atomic mass for sulphuric acid=2H + S + 4O
=2x1 + 32 + 4x16
2+32+64=34+64
=98g/mol
How much energy does cameron need to add to raise the temperature of a 0.500-kg sample of silver from 200 k to 205 k? the specific heat of silver is 236 j/kgk
Answers
energy to raise temperature is 590 J
Given:
mass of silver sample = 0.5 kg
initial temperature = 200 k
final temperature = 205 k
specific heat of silver = 236 j/kgk
To Find:
energy to raise temperature
Solution: The heat energy required to raise the temperature of of a substance through is called its specific heat capacity.
Q = cmΔt
where c= constant of proportionality, called specific heat capacity of the body
Q = mass x specific heat x ∆t
= 0.5 x 236 x ( 205-200 )
= 590 J
So, energy to raise temperature is 590 J
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two different isotopes of an element have different
Answers
Answer:
atomic weight or number of neutrons.
Explanation:
An isotope: is one of two or more forms of the same chemical element.
Different isotopes of an element have the same number of protons in the nucleus, giving them the same atomic number.
A different number of neutrons giving each elemental isotope a different atomic weight.
5. (04.03 LC)
Which of the following steps can be used to identify an acid-base reaction
Check if one element replaces another element in a compound.
Check if the ions of two compounds exchange places.
O Check whether the reactants are an acid and a base.
Check whether the products are an acid and a base.
Plz help
Answers
Answer: Check whether the reactants are an acid and a base.
Explanation:
The step to determine the acid-base reaction, it has been checked that where there has been an acid or base in the reactants or not. Thus, option C is correct.
The acid base reaction can be described as the chemical reaction involving the exchange of hydrogen ions in between the reactant species.
The acid base reaction has been mediated in the system where there has been the presence of an acid or base as the reactant in order to accept or donate hydrogen ions.
Thus, to determine the acid-base reaction, it has been checked that where there has been an acid or base in the reactants or not. Thus, option C is correct.
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What element has the noble gas configuration [Ar]4s23d8
Answers
Answer:
argon
Explanation:
Answer:
Argon
Explanation:
1a. Identify the chemical_____ comes from the breakdown of proteins.
Answers
is it amino acids???????
1s22s22p63s23p3 atoms of an element, x, have this electron configuration. The compound most likely formed with magnesium, Mg, is
A. MgX
B. Mg2X
C. MgX2
D. Mgx3
E. MgX2
Answers
Answer:
Mg3X2 is correct answerrrrrr
The laboratory compared the mass of the starting reactants and final products of the combustion reaction. A technician determined the mass of the firewood and oxygen reactants before burning to be 2.72 kg. After the firewood finished burning, the pile of cooled ash that remained had a mass of 0.095 kg. According to the law of conservation of mass, matter is neither created nor destroyed in a chemical reaction. Do the results of the technician’s combustion experiment contradict the law of conservation of mass?
Answers
The results of the technician’s combustion experiment do not contradict the law of conservation of mass because some products escaped as gaseous carbon (iv) oxide, water vapor, and other gases.
What is the statement of the law of conservation of mass?The statement of the law of conservation of mass states that matter cannot be created nor destroyed, but change from one form to another.
This helps to explain that no loss in mass of a substance occurs in ordinary chemical reactions, rather, the sum of the masses of the reactants at the beginning of a reaction is equal to the sum of the products at the end of the reaction.
The balancing of chemical equations also follows this law.
Considering the given reaction:
The technician determined the mass of the firewood and oxygen reactants before burning to be 2.72 kg.
At the end of the reaction, after the firewood finished burning, the pile of cooled ash that remained had a mass of 0.095 kg.
When comparing the mass of the reactants and products, the mass of the product seems to be less than the mass of the reactants in contradiction to the law of conservation of mass.
However, there is no loss in mass of the materials because some products escaped in the form of gas into the atmosphere.
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