Answers
Answer:
\(\Delta T=18.24\°C\)
Explanation:
Hello,
In this case, since the equation for computing the heat in terms of mass, specific heat and temperature change is:
\(Q=mCp\Delta T\)
For the given heat and mass, and considering the specific heat of iron to be 0.444 kJ/(kg°C), the resulting temperature change is:
\(\Delta T=\frac{Q}{mCp}=\frac{97.2kJ}{12.0kg*0.444\frac{kJ}{kg\°C}}\\ \\\Delta T=18.24\°C\)
Best regards.
Related Questions
How much work (in JJ) is required to expand the volume of a pump from 0.0 LL to 2.5 LL against an external pressure of 1.1 atmatm
Answers
Answer:
- 278.85 J
Explanation:
Given that:
Pressure = 1.1 atm
The initial volume V₁ = 0.0 L
The final volume V₂ = 2.5 L
The work that takes place in a reaction at constant pressure can be expressed by using the equation:
W = P(V₂ - V₁ )
Since the volume of the gas is expanded from 0 to 2.5 L when 1.1 atm pressure is applied. Then, the work can be given by the expression:
W = - P(V₂ - V₁ )
W = -1.1 atm ( 2.5 - 0.0) L
W = -1.1 atm (2.5 L)
W = -2.75 atm L
Recall that:
1 atm L = 101.4 J
Therefore;
-2.75 atm L = ( -2.75 × 101.4 )J
= -278.85 J
Thus, the work required at the chemical reaction when the pressure applied is 1.1 atm = - 278.85 J
g Determine the oxidation state for each of the elements below. ... The oxidation state of ... phosphorus ... in ... phosphorous tribromide PBr3 ... is ... . The oxidation state of nitrogen in nitrogen gas N2 is . The oxidation state of arsenic in arsenic acid H3AsO4 is .
Answers
Answer:
- P in PBr3 is +3.
- N in N2 is 0.
- As in H3AsO4 is +5.
Explanation:
Hello!
In this case, since the determination of the oxidation states is performed by using the well-known charge balances, we can proceed as shown below:
- P in PBr3: Here, bromide ions have an oxidation state of -1, so we follow:
\(P^xBr_3^-\\\\x-3=0\\\\x=+3\)
Thus, the oxidation state is +3.
- N in N2: Here, since nitrogen is bonding with nitrogen and it is neutral, we infer its oxidation state is 0.
- As in H3AsO4: Here, oxygen is -2 and hydrogen +1, so we follow:
\(H_3^+As^xO_4^{-2}\\\\3+x-8=0\\\\x=8-3\\\\x=5\)
Thus, the oxidation state is +5.
Best regards!
Of the three states of matter, molecules are moving the fastest and are the farthest apart in a what?
Answers
Answer:
Molecules are moving the fastest and are the farthest apart in the gaseous phase.
Explanation:
A sample of an ideal gas has a volume of 3.70 L at 12.20 ∘C and 1.40 atm. What is the volume of the gas at 20.80 ∘C and 0.989 atm?
Answers
The volume of the given gas is 5.35 L.
Here we use the combined gas law viz. P1V1/T1 = P2V2/T2, which is derived from the ideal gas equation PV = nRT, where
PV = nRT
where,
P = pressure
V = volume
n = no. of moles
R = gas constant = 0.0821 L atm/mol K
T = temperature.
Here,
\($P_1\) = 1.40 atm, \($P_ 2\)= 0.989 atm
\($V_1\) = 3.70 L, \($V_2\) = ?
\($T_1\) = 12.20°C = (12.20 + 273) K = 285.2 K
\($T_2\) = 20.80°C = (20.80 + 273) K = 293.8 K
substituting the values in the equation P1V1/T1 = P2V2/T2, we get,
(1.40 x 3.70)/285.2 = 0.989 x \($V_2\)/293.8
\($V_2\) = (1.40 x 3.70 x 293.8) / (285.2 x 0.989)
\($V_2\) = 1521.884 / 284.211
\($V_2\) =5.35 L
Thus, the volume of the gas is 5.35 L.
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Which of the following is based on facts and/ or evidence?
Answers
I need help ASAP
What is the density, in g/cm3, of an object with a mass of 21 g and volume of 15 cm3?
Answers
Answer:
1.4 g/cm3
Explanation:
Density = Mass/Volume
Mass = 21g
Volume = 15cm3
Density = 21/15 = 1.4
Which molecule is shown below?
H
H-C-H
H
Η Η Η Η
H-C-C-C-C-C-C-H
1 | | |
H H H H H H
O A. 2-ethylhexane
B. 2-methylhexane
C. 3-ethylhexane
D. 3-methylhexane
Answers
Answer:
b. 2-methylhexane
Explanation:
ap3x approved
The molecule shown below is - 2-methylhexane and the correct option is option B.
What is IUPAC Nomenclature?
The IUPAC system of nomenclature is a set of logical rules framed which are mainly aimed at giving an unambiguous name to an organic compound.
IUPAC stands for International Union of Pure and Applied Chemistry
A prefix to the name comes before the molecule. The prefix of the molecule's name is based on the number of carbon atoms.
For example, a chain of six carbon atoms would be named using the prefix hex-.
The suffix to the name is an ending that is applied that describes the types of chemical bonds in the molecule.
The molecule has 6 carbon atoms and a methyl group at the second position.
Therefore, The molecule is 2-methylhexane and the correct option is option B.
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What is a solute? A. the substance that dissolves another substance.
Answers
Consider the following diagram of a chemical reaction.
A series of four increasingly more complex chemical structures. The first diagram shows that when heat is applied to R single bond O single bond O single bond R, it creates 2 R single bond O with 1 electron dot. The next structure brings in more complex structures and other atoms, such as H and C. This process continues until the final molecule has a long chain of six starting with R O and ending with C with a single electron dot. There are four single side chains, 3 P h and 1 H.
What is the product that is formed in this reaction?
a polymer
a monomer
an alkyl halide
a carboxylic acid
Answers
Answer:
The answer is A
Explanation:
on EDG 2021
Answer:A
Explanation:
Given 0.08 of KMnO4, calculate the number of molecules
Answers
The number of molecules in the permanganate is 4.8 * 10^22 molecules
What is the number of the molecules?We know that if we are to obtain the number of molecules form the number of the moles of the substances then as a matter of necessity we would have to turn to the Avogadro's law and that is what we are going to do here.
We have that;
If 1 mole contains about 6.02 * 10^23 molecules
0.08 moles would contain 0.08 * 6.02 * 10^23/ 1
= 4.8 * 10^22 molecules
Hence, we have about 4.8 * 10^22 molecules in the permanganate
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Rocks are made of fossils and elements that naturally occur in Earth’s crust.
Answers
Answer:
sedimentary rocks
Explanation:
I did this assignment
0.2g of sand in two-third in liter of ethanol . What is the concentration in g per dm cube
Answers
The mass concentration of sand in the ethanol solution is 0.299 g/dm³.
What is the concentration in grams per dm³?To find the concentration in grams per cubic decimeter (g/dm³), we first need to convert the volume from liters to cubic decimeters (dm³). Since 1 liter is equal to 1 cubic decimeter, we can directly convert the volume.
Given:
Mass of sand = 0.2 g
Volume of ethanol = two-thirds liter
Converting volume to dm³:
1 liter = 1 cubic decimeter
two-thirds liter = (2/3) cubic decimeter = 0.67 dm³ (rounded to two decimal places)
Now we can calculate the concentration in g/dm³ by dividing the mass of sand by the volume in dm³:
Concentration = Mass / Volume
Concentration = 0.2 g / 0.67 dm³
Concentration ≈ 0.299 g/dm³ (rounded to three decimal places)
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what is 9 x 10^2/3 x 10^12 in scientific notation?
Answers
Answer:
That would be 4.17742995 * 10^13 :)
Explanation:
An alpha particle is an ionized helium nucleus, consisting of 2 protons and 2 neutrons bound together. When alpha particles are beamed toward a thin metal foil, most of them pass through, undergoing a small deflection, while a small fraction of them bounce back at much larger angles in excess of 90 degrees relative to their incoming direction. The reason this happens is that Group of answer choices
Answers
Answer:
Due presence of empty as well as heavy particles.
Explanation:
The main reason for this is the presence of empty spaces as well as heavy particles in the nucleus of Helium atom. Most of the beam pass through the helium atom due to the presence of empty spaces in the atom whereas some beams deflect from the helium atom because both repel each other due to same charge i.e. positive charge. Few beams of light bounce back with an angle of 90 degree due hitting with the nucleus where heavy particles such as neutron and proton are present.
What trophic level has heterotrophs?
a only the second level
b all levels except the first
C only the first level
d only the last level
Answers
A tumor marker is being developed to detect early breast cancer. Of the 400 women who volunteered for the study, 350 tested negative for the marker. Of these women, three developed breast cancer. The 50 women who tested positive for the marker underwent further tests, of these 50 women, 48 were diagnosed with early breast cancer, and the other two women were found to not have breast cancer. Use enclosed excel sheet for your answers (including your calculations)
Answers
While tumor marker test results can be useful, they are not conclusive. A low result does not imply that you do not have cancer or that you are in remission.
CA 15-3, for example, is raised in less than half of patients with early breast cancer and in more than 80% of those with metastatic breast cancer. Three tumor markers, cancer antigen 15-3 (CA 15-3), cancer antigen 27.29 (CA 27.29), and carcinoembryonic antigen (CEA), have been used in breast cancer care to help monitor metastatic breast cancer (advanced disease), but they have not been found to be useful in detecting a breast cancer recurrence or extending lives. If the level falls, the treatment is effective. If it rises, the cancer may be spreading.
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7. What is the volume of the
composite
solid?
4 in.
3 in.
3 in.
Answers
Answer:
The volume of Component 1 is 36 cubic inches.
Explanation:
To calculate the volume of a composite solid, we need to determine the individual volumes of the different components and then add them together.
In this case, the composite solid consists of multiple components with the following dimensions:
Component 1:
Length: 4 inches
Width: 3 inches
Height: 3 inches
To find the volume of Component 1, we multiply the length, width, and height together:
Volume of Component 1 = Length x Width x Height = 4 in x 3 in x 3 in = 36 cubic inches
Therefore, the volume of Component 1 is 36 cubic inches.
Please provide the dimensions of the remaining components of the composite solid, and I will calculate the total volume by summing up the individual volumes.
What happens to the amount of solution when we add food colour to it?
Answers
Answer:
We need more? What else is in the question? This is unanswerable.
Explanation:
if you reply with a link, I will report you
Answers
Answer:
1 2 2
Explanation:
The following diagrams represent reaction of A2 (shaded spheres) with B2 (unshaded spheres). How many moles of product can be made from 1.0 mol of A2 and 1.0 mol of B2
Answers
The number of moles of products based on the information given is 0.5 moles product.
How to explain the diagramIt is given that each unshaded sphere represents an atom A and shaded represents B. If we look at the diagram, we have 8 unshaded doubly attached units and 4 unshaded doubly attached units on the left side which means we have 8 A2 molecules that react with 4 B2 molecules.
Whereas in the right-side diagram(which are products), 4 molecules have 4 unshaded and one shaded sphere, which means it is BA4 and 2 moles have two shaded spheres which mean it is B2. Hence, the number of moles of products based on the information given is 0.5 moles product.
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How can the rate of this reaction be increased
Answers
Answer:
If you increase the concentration of a reactant, there will be more of the chemical present. More reactant particles moving together allow more collisions to happen and so the reaction rate is increased. The higher the concentration of reactants, the faster the rate of a reaction will be.
whats pairs of coumpounds produce calcium solphate
Answers
Calcium sulfate (CaSO4) is a chemical compound made from calcium, oxygen, and sulfur.
Which pairs of compounds produce calcium sulfate?The major sources of calcium sulfate naturally happen are gypsum and anhydrite, which occur at many position worldwide as evaporites.
A simple procedure for preparing acicular calcium sulfate dihydrate is on condition that in which a slurry of calcium carbonate carrying 100 to 800 grams per lite of calcium carbonate is assorted with a solution of sulphuric acid carrying 80 to 500 grams per liter sulphuric acid in proportions that construct calcium sulfate.
So we can conclude that Calcium sulfate, CaSO4, is a natural happen calcium salt.
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The air inside a balloon is at a temperature of 200 K and a pressure of 3.00 atm. If the balloon contains 0.60 mol of air, what is its volume? R= 0.0821 L atm/mol K
Answers
The volume inside the balloon at a temperature of 200K and a pressure of 3.00atm is 3.28L.
How to calculate volume?The volume of a gas can be calculated using the ideal gas law equation as follows:
PV = nRT
Where;
P = pressureV = volumen = number of moles T = temperatureR = gas law constantAccording to this question, the air inside a balloon is at a temperature of 200 K and a pressure of 3.00 atm. If the balloon contains 0.60 mol of air, the volume can be calculated as follows:
3 × V = 0.60 × 0.0821 × 200
3V = 9.852
V = 9.852/3
V = 3.28L
Therefore, 3.28L is the volume of the air inside the balloon.
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An atom's Lewis dot structure has four dots. Which of the following elements could it be, and why?
Answers
Answer: Carbon, because it is in group 14 and has four valence electrons
Explanation: Just did this quiz
Answer:carbon
Explanation:
a. Identify the structures shown in the diagram. b. Identify the information that is contained within these structures. c. Describe how the structures from this cell would compare to the structures in the nucleus of another body cell from the same person. d. Explain why the structures are in pairs.
Answers
The answer responses to the structures shown in the diagram are:
A. chromosomes
C. They would be the same.
B. They are in pairs because each one comes from a different parent.
What is the structure about?The chromosomes are in pairs because humans have a diploid number of chromosomes, meaning they have two sets of chromosomes, one inherited from each parent.
The nucleus is important in eukaryotic cells and has many important parts that help the cell work properly. There are some parts inside cells called the nuclear membrane, nucleoplasm, nucleolus, and chromatin. Chromatin is made up of DNA and other proteins.
Every part of a person's body has the same genes, but the way they are organized can be different in different types of cells. The chromosomes in our skin cells might not be the same as the chromosomes in our muscle cells, even if they come from the same person.
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Identify the structures shown.
A. chromosomes
B. mitochondria
C. nuclei
D. vacuoles
C
Describe how the structures from this cell would compare to the structures in the nucleus of another body cell from the same person.
A. There would be longer.
B. They would be shorter.
C. They would be the same.
D. They would be different.
Describe how the structures from this cell would compare to the structures in the nucleus of another body cell from the same person.
A. There would be longer.
B. They would be shorter.
C. They would be the same.
D. They would be different.
Explain why the structures are in pairs.
A. They aren't in pairs.
B. They are in pairs because each one comes from a different parent.
C. This cell is making a copy of itself.
D. The cell always has 2 copies in case 1 is damaged.
A 1.85-mole sample of H₂O2 weighs
(A) 33.3 amu
(B) 35.9 g
C) 62.9 g
(D) 1.85 g
E 33.3 g
Answers
Considering the definition of molar mass, the correct answer is option c): the mass of 1.85 moles H₂O₂ is 62.9 grams.
Definition of molar massThe molar mass of substance is a property defined as the amount of mass that a substance contains in one mole.
The molar mass of a compound is the sum of the molar mass of the elements that form it (whose value is found in the periodic table) multiplied by the number of times they appear in the compound.
Molar mass of H₂O₂In this case, you know the molar mass of the elements is:
O= 16 g/moleH= 1 g/moleSo, the molar mass of the compound H₂O₂ is calculated as:
H₂O₂= 2× 1 g/mole + 2× 16 g/mole
Solving:
H₂O₂= 34 g/mole
Mass of 1.85 moles H₂O₂You can apply the following rule of three: If by definition of molar mass 1 mole of the compound contains 34 grams, 1.85 moles of the compound contains how much mass?
mass= (1.85 moles× 34 grams)÷ 1 mole
mass= 62.9 grams
Finally, the mass of 1.85 moles H₂O₂ is 62.9 grams.
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Which statements correctly describe and provide evidence for the double replacement reaction?
Answers
The statements which correctly describe and provide evidence for the double replacement reaction are:
reactants rearrange to form new productsmetal replaces a nonmetalthe cations trade placesThe correct options are A, D, and E.
What are double replacement reactions?Double replacement reactions are reactions where there is an exchange of radicals between two compounds when their solution is mixed together.
In double replacement reactions, a precipitate is always formed.
Also, the metallic ions trade places such that the cation of one compound is exchanged with the cation of the other compound.
A typical double replacement reaction is illustrated below:
AB + CD ---> AD + CB
where;
A and C are cations
B and D are anions.
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Complete question:
Which statements correctly describe and provide evidence for the double replacement reaction?
reactants rearrange to form new productsthere is a single element formeda metal replaces a nonmetala precipitate is formedthe cations trade places4 Fe(s) + 3 02(g)
--> 2 Fe₂O3(s)
1. What is the oxidation state of iron (Fe) in the reactant Fe(s)?
2. What is the oxidation state of oxygen (O) in the reactant O2(g)?
3. What is the oxidation state of iron (Fe) in the product Fe2O3(s)?
4. What is the oxidation state of oxygen (O) in the product Fe2O3(s)?
5. In this reaction, iron is... (oxidized or reduced?)
6. In this reaction, oxygen is... (oxidized or reduced?)
7. What was the oxidizing agent in this reaction: Fe(s) or O2(g)?
Answers
The oxidation number of reactant Fe is 0 while the oxidation number of iron in the product is +3
What s a redox reaction?The term redox reaction implies a reaction in which there is an increase in the oxidation number of a specie and the decrease in the oxidation number of another specie.
Now we have the answers as follows;
1) The oxidation number of reactant Fe is 0
2) The oxidation number of reactant oxygen is 0
3) The oxidation number of iron in the product is +3
4) The oxidation number of oxygen in the product is -2
5). Iron is oxidized in the reaction
6) Oxygen is reduced in the reaction
7) The oxidizing agent in this case is the oxygen atom
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The electronic configuration 1s2,2s2,2p6,3s2 belongs to which element?
Answers
The electronic configuration 1s2,2s2,2p6,3s2 belongs to Magnesium.
Electronic configuration depicts the filling of electrons in the subshell and predicts the properties of the elements.The electronic configuration has two electrons in the outermost shell which depicts the alkaline earth metal group.Checking from the periodic table we get the element as magnesium.The distribution of electrons in an element's atomic orbitals is described by the element's electron configuration. Atomic electron configurations are represented via a common notation in which all atomic subshells that contain electrons (with the number of electrons written in subscript)Uses for electron configurations include: figuring out an element's valency, predicting a set of components' qualities (elements with similar electron configurations tend to exhibit similar properties).It also helps in analyzing atomic spectrum data.To learn more about electronic configuration visit:
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If 5.00 g of Gas A and 5.00 g of Gas B are mixed in the same container, and the partial pressure of Gas B is determined to be twice that of Gas A, what do we know about the gases? A) Gas A has half the molar mass of Gas B. B) Gas A has twice the molar mass of Gas B. C) Gas A has a higher temperature than Gas B. D) Gas A takes up twice the volume in the vessel than Gas B.
Answers
Answer:
B) Gas A has twice the molar mass of Gas B.
Explanation:
Partial pressure of a gas is defined as the moles of the gas/ Total moles of the mixture times total pressure. The equation is:
Partial pressure A = Moles A / total moles * Total pressure
From the definition, we can say that the moles of the gas A are twice the moles of B:
2 Moles A = Moles B
As the mass of both gases is the same but the moles of B are twice the moles of A:
The molar mass of A is twice the molar mass of B
Right answer is:
B) Gas A has twice the molar mass of Gas B.We have that for the Question " what do we know about the gases?"
It can be said that
B) Gas A has twice the molar mass of Gas B \(M_A=2M_B\)
From the question we are told
5.00 g of Gas A and 5.00 g of Gas B are mixed in the same container, and the partial pressure of Gas B is determined to be twice that of Gas A
The equation for partial pressure gasA and gasB is given as
\(Partial Pressure = \frac{number of moles of }{Total no of moles of gas}\)
That results to,
\(\frac{Partial pressure of A}{Partial pressure of B} = \frac{no of moles of A}{no of moles of B}\)
\(= \frac{Given mass A}{Molar mass A} * \frac{Molar mass B}{Given mass B}\\\\= \frac{1}{2} = \frac{5*M_B}{M_A*5}\\\\= \frac{1}{2} = \frac{M_B}{M_A}\\\\= M_A = 2M_B\)
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