Answers
The change in internal energy (ΔΕ) of a system : -8 kJ
Further explanationThe laws of thermodynamics 1 state that: energy can be changed but cannot be destroyed or created
The equation is:
\(\tt \Delta U=Q+W\)
Energy owned by the system is expressed as internal energy (U)
This internal energy can change if it absorbs heat Q (U> 0), or releases heat (U <0). Or the internal energy can change if the system does work or accepts work (W)
The sign rules for heat and work are set as follows:
• The system receives heat, Q +
• The system releases heat, Q -
• The system does work, W -
• the system accepts work, W +
5 kJ of work is done on the system : W = +5 kJ
releases 13 kJ of energy to the surroundings : Q = -13 kJ
\(\tt \Delta E=-13+5=-8~kJ\)
Related Questions
fill in the blank. if dissociation of mgcl2 in water were 100%, the van`t hoff factor would be___; however, for real solutions the van`t hoff factor for mgcl2 is (greater than, less than) this value.
Answers
If dissociation of mgcl2 in water were 100%, the van`t hoff factor would be 3 (three); however, for real solutions the van`t hoff factor for mgcl2 is (greater than, less than) this value.
MgCl2 dissociates into three ions when it dissolves in water, giving it a theoretical van't Hoff factor of 3. The van't Hoff factor for MgCl2 is normally tested at a value of no more than 2.7.
The van't hoff factor for magnesium chloride is 3. The letter I stands for the Van't Hoff factor. One magnesium cation and two chloride ions make up the last three ions formed when magnesium chloride separates. Consequently, the magnesium chloride van't hoff factor is equal to 3.
A solute's impact on associated properties, such as osmotic pressure, relative vapor pressure reduction, boiling-point elevation, and freezing-point depression, is measured by the van 't Hoff factor i.
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which of the following features provides evidence of a glacier and establishes its directed of movement?
Answers
Answer:
The pressure from the weight of the glacier generates a layer of water that helps the ice glacier move downslope. This process is called basal sliding. Also, the glacier begins to move under its own weight. The glacier is so heavy and exerts so much pressure that the firn and snow melt without any increase in temperature.
If the student’s estimate of the balloon’s volume was incorrect and the actual volume was 620 ml, would the amount of glucose that actually reacted be more than or less than the amount calculated in part (c)? Explain your response.
( C answer ) only 1.9 g of glucose reacted and only .0211 mol of co2 was formed.
Answers
The number of moles of CO2 produced is 0.021 moles
If the estimated volume of the balloon is wrong then the amount of glucose reacted must be more than is stated.
What is respiration equation?The respiration equation represents the chemical process of aerobic cellular respiration, which occurs in the mitochondria of cells and is the primary way in which cells generate energy in the form of ATP (adenosine triphosphate).
The equation of the reaction is;
C6H12O6 + 6O2 → 6CO2 + 6H2O + ATP
We know that;
Number of moles of glucose = 10 g/180 g/mol
= 0.056 moles
PV = nRT
n = PV/RT
n = 1 * 0.55/318 * 0.082
n = 0.021
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If the reaction occurs between Fe2S3(s) and H(aq) and the equation is properly balanced with the
smallest whole-number coefficients, what is the sum of the coefficients for all reactants and products?
Fe2S3(s) + H+ (aq)
Please answer this mathematically.
Answers
In the reaction between Fe₂S₃(s) and HBr(aq), the sum of the coefficients for all reactants and products is 12.
If the reaction occurs between Fe₂S₃(s) and HBr(aq) and the equation is properly balanced with the smallest whole-number coefficients, what is the sum of the coefficients for all reactants and products?
Let's consider the unbalanced equation for the reaction between Fe₂S₃(s) and HBr(aq). This is a double displacement reaction.
Fe₂S₃(s) + HBr(aq) ⇒ FeBr₃(aq) + H₂S(g)
We will balance it using the trial and error method.
First, we will balance Fe atoms by multiplying FeBr₃ by 2.
Fe₂S₃(s) + HBr(aq) ⇒ 2 FeBr₃(aq) + H₂S(g)
Then, we will balance S atoms by multiplying H₂S by 3.
Fe₂S₃(s) + HBr(aq) ⇒ 2 FeBr₃(aq) + 3 H₂S(g)
Finally, we will get the balanced equation by multiplying HBr by 6.
Fe₂S₃(s) + 6 HBr(aq) ⇒ 2 FeBr₃(aq) + 3 H₂S(g)
The sum of the coefficients for all reactants and products is:
\(1 + 6 + 2 +3 = 12\)
In the reaction between Fe₂S₃(s) and HBr(aq), the sum of the coefficients for all reactants and products is 12.
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Which bone is located between the incus and the inner ear?
cochlea
stapes
incus
malleus
Answers
Answer: The answer is incus
Part A Identity the reactants and products in this chemical equation Drag the appropriate labels to their respective targets. Reset Help reactant 4 NH3(g) + 5 O2(g) 4 NO(g) + 6 H2O(8) product
Answers
In the reaction: 4 NH₃ + 5 O₂ → 4 NO + 6 H₂O, the reactants are NH₃ and O₂ and the products are NO and H₂O.
The balanced chemical reaction is given as,
4 NH₃ + 5 O₂ → 4 NO + 6 H₂O
The substance present in the left of the arrow in a chemical equation are called reactants. Basically, a reactant is a substance that is present at the start of a chemical reaction. The substance(s) present in the right of the arrow are called products. Basically, a product is defined as a substance that is present at the end of a chemical reaction.
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How many liters of carbon dioxide can be produced if 37.8 grams of carbon disulfide react with excess oxygen gas at 28.85 degrees Celsius and 1.02 atmospheres?
CS2(l) + 3O2(g) yields CO2(g) + 2SO2(g)
2.78 liters
5.95 liters
12.1 liters
11.9 liters
Answers
The volume of carbon dioxide produced is approximately (d) 11.9 liters.
To determine the amount of carbon dioxide (C\(O_2\)) produced when 37.8 grams of carbon disulfide (C\(S_2\)) reacts with excess oxygen gas (\(O_2\)), we need to use stoichiometry and the given balanced chemical equation:
C\(S_2\)(l) + 3\(O_2\)(g) → C\(O_2\)(g) + 2S\(O_2\)(g)
First, we calculate the number of moles of C\(S_2\) using its molar mass:
Molar mass of (C\(S_2\)) = 12.01 g/mol (C) + 32.07 g/mol (S) × 2 = 76.14 g/mol
Number of moles of (C\(S_2\)) = mass / molar mass = 37.8 g / 76.14 g/mol ≈ 0.496 mol
From the balanced equation, we can see that the stoichiometric ratio between (C\(S_2\)) and C\(O_2\) is 1:1. Therefore, the number of moles of C\(O_2\) produced will also be 0.496 mol.
Now we can use the ideal gas law to calculate the volume of C\(O_2\) at the given temperature and pressure. The ideal gas law equation is:
PV = nRT
where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant (0.0821 L·atm/mol·K), and T is the temperature in Kelvin.
Converting the temperature from Celsius to Kelvin:
T(K) = 28.85°C + 273.15 = 302 K
Using the ideal gas law:
V = nRT / P = (0.496 mol) × (0.0821 L·atm/mol·K) × (302 K) / (1.02 atm) ≈ 11.9 L
The correct answer is 11.9 liters.
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What is the shape of a molecule that has 3 atoms bonded to a central atom and no lone pairs of electrons?
Answers
Answer and Explanation: A molecule consisting of central atom with three bond pairs and one lone pair of electrons will have trigonal pyramidal shape.
Determine the value of Kc for the following reaction, if the equilibrium concentrations are as follows: [N2]eq = 2.66 M, [H2]eq = 0.64 M, [NH3]eq = 3.34 M.
N2(g) + 3 H2(g) ⇌ 2 NH3(g)
Answers
The value of Kc for the given reaction is 0.0579 (rounded to four decimal places).
The formula for the equilibrium constant, Kc, of a reaction is given by the ratio of the product of the concentrations of the products raised to their respective stoichiometric coefficients to the product of the concentrations of the reactants raised to their respective stoichiometric coefficients.
The stoichiometric coefficients are the coefficients in the balanced chemical equation.
To determine the value of Kc for the reaction given by the following chemical equation:N2(g) + 3 H2(g) ⇌ 2 NH3(g)
we first need to write the expression for Kc.
The expression for Kc is given by the following formula:Kc = [NH3]² / [N2][H2]³.
We are given the equilibrium concentrations as follows:[N2]eq = 2.66 M[H2]eq = 0.64 M[NH3]eq = 3.34 M
We can substitute these values into the expression for Kc and obtain the following:Kc = (3.34)² / (2.66)(0.64)³ = 0.0579 (rounded to four decimal places).
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HQ5.40
Homework Answered Due Today, 11:59 PM
The reaction 3H₂(g) + N₂(g) → 2NH3(g) has an enthalpy of reaction of -92.6 kJ/mol. If 1 g of hydrogen and 2 g of nitrogen are
reacted, how much heat is produced (kJ)?
Answers
The amount of heat energy produced when 1 g of hydrogen and 2 g of nitrogen are reacted, is -6.61 KJ
How do i determine the heat energy produced?First, we shall obtain the limiting reactant. Details below:
3H₂ + N₂ -> 2NH₃
Molar mass of N₂ = 28 g/molMass of N₂ from the balanced equation = 1 × 28 = 28 g Molar mass of H₂ = 2 g/molMass of H₂ from the balanced equation = 3 × 2 = 6 gFrom the balanced equation above,
28 g of N₂ reacted with 6 g of H₂
Therefore,
2 g of N₂ will react with = (2 × 6) / 28 = 0.43 g of H₂
We can see that only 0.43 g of H₂ is needed in the reaction.
Thus, the limiting reactant is N₂
Finally, we the amount of heat energy produced. Details below:
3H₂ + N₂ -> 2NH₃ ΔH = -92.6 KJ
Molar mass of N₂ = 28 g/molMass of N₂ from the balanced equation = 1 × 28 = 28 gFrom the balanced equation above,
When 28 grams of N₂ reacted, -92.6 KJ of heat energy were produced.
Therefore,
When 2 grams of N₂ will react to produce = (2 × -92.6) / 28 = -6.61 KJ
Thus the heat energy produced from the reaction is -6.61 KJ
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What is N for silicon tetrachloride, SiCl4?
Answers
For each of these molecules, identify the proper MO diagram and the number of valence electrons. The 1
orbital is not shown.
Identify the MO diagram for B2.
diagram A
diagram B
B2
valence e−:
6
Identify the MO diagram for C2.
diagram A
diagram B
C2
valence e−:
6
Identify the MO diagram for N2.
diagram A
diagram B
N2
valence e−:
10
TOOLS
x10y
Identify the MO diagram for O2.
diagram B
diagram A
O2
valence e−:
16
Identify the MO diagram for F2
.
diagram B
diagram A
F2
valence e−
Answers
The molecular orbitals for each of the required molecules has been shown in the images attached.
What is an MO diagram?
An illustration of a molecule's molecular orbitals and the corresponding energy levels is called a molecular orbital (MO) diagram. MO diagrams are used to illustrate how the atomic orbitals in a molecule combine to generate the molecular orbitals.
The diagram shows the internuclear distance between the two atoms on the horizontal axis and the relative energy of the atomic orbitals on the vertical axis.
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Reflect on the learning activities titled “Hypothesis”, “Variables and Hypothesis” and “Constructing a Hypothesis”. Describe some similarities and differences between a question that comes in response to an observation, and a scientific research question? Cite quotes from the readings to support your answer. Where do variables fit into this thinking? In other words, if you imagine a number line with observation questions at one end and scientific research questions at the other, what role do variables play anywhere along this continuum?
Answers
The learning activities titled "Hypothesis," "Variables and Hypothesis," and "Constructing a Hypothesis" all share certain similarities and differences. A question that arises in response to an observation is similar to a scientific research question in that both require some level of investigation to achieve an answer. However, scientific research questions are typically more specific and refined, with a defined methodology for obtaining data and verifying results.
The following quotes from the readings illustrate this distinction:"A scientific question is one that can be answered by using scientific investigation. In contrast, an observation question is one that comes in response to observing or experiencing something in the natural world" (Scientific Inquiry: Variables, Hypotheses, and the Scientific Method)."An important feature of a scientific question is that it should be answerable within a reasonable amount of time and with the resources available" (Scientific Inquiry: Variables, Hypotheses, and the Scientific Method)."Research questions can be narrow or broad, depending on the scope of the research" (Constructing a Hypothesis).The concept of variables is crucial to both observation and scientific research questions, but they play different roles depending on where they fall on the continuum. Observation questions are usually less precise and may not require much consideration of variables. On the other hand, scientific research questions are likely to include a rigorous examination of variables and their potential effects."Variables are an essential part of a scientific experiment. They are the things that change in an experiment" (Scientific Inquiry: Variables, Hypotheses, and the Scientific Method)."Variables are important because they can affect the outcome of the research" (Constructing a Hypothesis).In summary, observation questions and scientific research questions share some similarities, but the latter is more specific, has a defined methodology, and may require more consideration of variables.For such more question on Hypothesis
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Calculate the number of C atoms in 9.837 x 1024 molecules of CO2.
Please help
Answers
Answer:
Explanation:
1 molecule contains 1 carbon atom.
9.837 * 10^24 molecules contains 9.837 * 10^24 atom of carbon.
It's a 1 to 1 ratio.
Bromine pentafluoride BrF5 is a good example of inter halogen molecule
a) What is the Lewis dot structure for bromine pentafluoride?
b) What is the formal charge on bromine?
c) What are the oxidation states on: Br F
d) What is the bond angle in this molecule?
e) What is the geometry of this molecule?
f) This molecule contains POLAR / NONPOLAR bonds. (Circle one)
g) This molecule is POLAR / NONPOLAR. (Circle one)
Answers
Answer:
a) The lewis dot structure is shown in the image attached to this answer
b) The formal charge on each of the atoms is zero
c) bromine has an oxidation state of +5 while fluorine has an oxidation state of -1
d) 90 degrees
e) Square Pyramidal
f) polar bonds
g) polar molecule
Explanation:
The molecule BrF5 has a formal charge of zero. It exhibits an sp3d2 hybridization state with a square pyramidal geometry. The bond angle in the molecule is 90 degrees. It is a molecule of the type AX5E. The oxidation state of bromine is +5 while that of fluorine is -1.
The Br-F bonds are polar. The overall molecule is polar due to asymmetric charge distribution concentrating on the central atom since the molecule is square pyramidal.
Task:
For each "station", click on the link. You should describe the initial appearances and observations of the
reaction during and after. Using your observations, determine if the change is a physical or chemical change.
Station #1: Lead Nitrate and Potassium lodide solutions. Shower of yellow
QUESTION/OBSERVATION
INITIAL APPEARANCE (what does the
substance look like in the beginning)
Answers
The expected observations for the chemical reaction involving lead nitrate and potassium iodide are as follows as per theory.
INITIAL APPEARANCE:Before the reaction, you'd have two separate solutions:
Lead Nitrate solution: This is typically a clear, colorless solution.
Potassium Iodide solution: This is also usually a clear, colorless solution.
REACTION OBSERVATIONS:
As soon as you combine these two solutions, a chemical response takes place, resulting in the almost instantaneous development of a yellow precipitate. Lead iodide is a substance that cannot be dissolved in water.
FINAL APPEARANCE:
The final mixture would have a yellow precipitate (lead iodide) suspended in the solution.
The reaction leads to the formation of lead iodide, a substance with distinctive properties, suggesting a chemical change. The presence of this novel compound is indicated by the yellow hue of the precipitate.
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The area surrounding the nucleus is called: protons electrons neutrons electron cloud
Answers
Answer:
eletrons
Explanation:
eletrons is not in the neuclus its around it
Answer:
electrons can be found around the nucleus in an electron cloud.
Explanation:
chemists use solution concentration units to
Answers
are alkaline earth metals metals nonmetals or metalloids; elements in groups 3 through 12 have many useful properties and are called; are transition metals metals nonmetals or metalloids; ________________ structure controls the physical properties of elements. nucleus electron; metalloids in periodic table; charges vary for these group of elements since multiple charged ions can be formed.; nonmetal elements; is boron a metal non-metal or metalloid
Answers
Alkaline earth metals are metals.
Elements in Groups 3 through 12 have many useful properties and are called transition metals.
Physical structure controls the physical properties of elements.
Boron is a non-metal.
Does anyone know Chemistry
Answers
Answer:
so so
Explanation:
this your question?? <_>
What is the pressure of a 1.0 L flask containing 0.12 g of He at 25°C? (R= 0.0821 L atm/mol K)
Answers
Answer:
The pressure of the flask is 0.73 atm.
Explanation:
To solve this question, we should use the ideal gas law: PV=nRT, where P represents the pressure (in atm in this case), V represents the volume (in L), n represents the number of moles of gas, R is the ideal gas constant, and T represents the temperature (in K).
Before we can plug our values into the equation, we must convert so that our units cancel out. First, we should convert our temperature from degrees Celsius to degrees K.
25°C + 273.15 = 298.15K
Next, we should convert the 0.12 g He to moles using the molar mass of He.
0.12 g He * (1 mole He/4.003 g He) = 0.029978 mol He
Now, we can plug in the values into the equation and solve for the pressure.
PV = nRT
P = (nRT)/V
P = (0.029978 mol He * 0.0821 L*atm/mol*K * 298.15 K)/(1.0 L)
P = 0.73 atm
Therefore, the correct answer is 0.73 atm.
Hope this helps!
From what did Oceans form?
Answers
Answer:
God
Explanation:
a competition between a given substance and its dissolved species is ?
Answers
Answer:
Explanation:
It is odd to describe the presence of a given substance and its dissolved species as a competition but the state is called an equilibrium in solubility.
Answer:
Solubility
Explanation:
Mark that
The amount of given substance and dissolved species is constant at equilibrium .
As per le ch atler's principle
If you change the concentration it would affect the Equilibrium n
chlorine reacts with fluorine to form flowing monofluoride write an equation for this reaction including the state symbols are the substances are a room temperature
Answers
Hope this helped
How many atoms of oxygen (o)are present 2naOH+H2SO4 2H2O+Na2SO4
Answers
Answer:
10
Explanation:
What is the final chemical equation from the following intermediate chemical equations?
2 equations. First: upper P subscript 4 upper O subscript 6 (s) right arrow upper P subscript 4 (s) plus 3 upper O subscript 2 (g). Second: upper P subscript 4 (s) plus 5 upper O subscript 2 (g) right arrow upper P subscript 4 upper O subscript 10 (s).
Upper P subscript 4 upper O subscript 6 (s) plus 2 upper O subscript 2 (g) right arrow upper P subscript 4 upper O subscript 10 (s).
Upper P subscript 4 upper O subscript 6 (s) plus 8 upper O subscript 2 (g) right arrow 2 upper P subscript 4 (s) plus upper P subscript 4 upper O subscript 10 (s).
Upper P subscript 4 upper O subscript 6 (s) plus 15 upper O subscript 2 (g) right arrow upper P subscript 4 (s) plus upper P subscript 4 upper O subscript 10 (s).
Upper P subscript 4 upper O subscript 6 (s) StartFraction 5 over 3 EndFraction upper O subscript 2 (g) right arrow upper P subscript 4 upper O subscript 10 (s).
pls hurry
Answers
Answer:
A
Explanation:
edge2021
Answer:
A.
Explanation:
Edge
Please help i need this chart filled out!!!
Answers
The volume of the solids are found in the attached table.
What are the unit for measuring volume of liquids?Volume of a substance refers to the amount of space a given mass of the substance occupies.
Since liquids have no definite volume, the volume of liquids are measured using containers.
Also, the volume of solids can be determined by displacing liquids.
The unit for measuring the volume of a liquid substance is liters.
Other multiples of the base unit are, mL, cL, dL, daL, hL, kL.
Considering the given volume of substances, the table can be filled as seen in the attachment.
In conclusion, the volume of solids was determined by displacing liquids water.
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conclusion for polarity of liquid
Answers
Answer:
The polarity of a liquid refers to the separation of electric charge within the molecules of the liquid, resulting in a positive and negative end. Based on this, we can draw the following conclusion:
In conclusion, the polarity of a liquid is an important property that affects its behavior and interactions with other substances. Polar liquids have molecules with an uneven distribution of charge, resulting in positive and negative ends. This polarity influences various aspects, such as solubility, surface tension, and the ability to dissolve other polar substances. Additionally, polar liquids tend to exhibit stronger intermolecular forces, leading to higher boiling and melting points compared to nonpolar liquids. Understanding the polarity of a liquid is crucial for various fields, including chemistry, biology, and material science, as it helps explain and predict the behavior and properties of different substances in a wide range of applications.
PLEASE MARK AS BRAINLIESTAnswer:
The polarity of a liquid refers to the separation of electric charges within the molecule, resulting in a molecule with a positive end and a negative end. The presence or absence of polarity in a liquid has significant implications for its behavior and interactions with other substances.
In conclusion, the polarity of a liquid plays a crucial role in determining its physical and chemical properties. Polar liquids, such as water, have an unequal distribution of charge within their molecules, leading to hydrogen bonding and strong intermolecular forces. These interactions give rise to properties like high boiling points, surface tension, and solubility, making polar liquids excellent solvents and essential for many biological processes.
On the other hand, nonpolar liquids, such as hydrocarbons, have a symmetrical distribution of charge and lack strong intermolecular forces like hydrogen bonding. As a result, they have lower boiling points, weaker interactions, and are typically less soluble in polar solvents. Nonpolar liquids are commonly used as solvents for nonpolar compounds and have different applications in various industries.
Understanding the polarity of a liquid is crucial in fields such as chemistry, biology, and materials science. It helps predict how substances will interact and dissolve in a given solvent, as well as how they will behave in chemical reactions. Additionally, polarity affects the physical properties of liquids, including their viscosity, conductivity, and surface behavior.
In summary, the polarity of a liquid is a fundamental characteristic that influences its behavior, solubility, and reactivity. Whether a liquid is polar or nonpolar has far-reaching consequences in various scientific disciplines and practical applications
The K of a given reactions is 432. Is the reaction favorable or not favorable?
Answers
Answer:Favorable
Explanation:um I know That it is Favorable sorry!
Select the correct answer.
In this course, you will be learning about which of the following topics:
A. Advantages and challenges of Childcare
B. Organizational Skills
C. Home Safety
D. All of the above
Answers
D?
Explanation:
considering they're all similar options I'd assume D, but there isn't any context