The number of moles of oxygen produced if 353.7 KJ of heat energy is absorbed is 0.75 mole
How to determine the moles of oxygen formedThe balanced equation for the reaction is given below:
6Fe₂O₃ --> 4Fe₃O₄ (s) + O₂ (g) ΔH = 471.6 KJ
Considering the equation,
6 moles of Fe₂O₃ produced 1 mole of O₂
Thus, we can say that:
When 471.6 KJ of heat were absorbed, 1 mole of O₂ was formed.
With the above, information, we can obtain the mole of O₂ formed when 353.7 KJ of heat is absorbed. Details below.
From the balanced equation above,
When 471.6 KJ of heat were absorbed, 1 mole of O₂ was formed
Therefore,
When 353.7 KJ of heat are absorbed = (353.7 KJ × 1 mole) / 471.6 KJ = 0.75 mole of O₂ is formed
Thus, we can conclude that the mole of oxygen formed is 0.75 mole
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Write the ionic and net ionic equations for the following reaction:
Co(NO3)2(aq) +Na2CO3(aq)->
Co(NO3)2(aq) +Na2CO3(aq)+CH3COOH->
The ionic and net ionic equations for the following reaction is
Co(NO3)2(aq) +Na2CO3(aq)->NaNo3 + CaCO3
Co(NO3)2(aq) +Na2CO3(aq)+CH3COOH-> NaNo3 + CH3COOCo + H2O
What is ionic equation?Ionic equation is defined as a chemical equation that expresses electrolytes in aqueous solution as dissociated ions.
An ionic equation can also be defined as one that solely depicts the atoms and ions that really participate.
Net ionic equation is defined as only those elements, molecules, and ions actually involved in the chemical process are shown in the chemical equation.
It can also be defined as an equation that simply includes the components that are really involved in the reaction.
Thus, the ionic and net ionic equations for the following reaction is
Co(NO3)2(aq) +Na2CO3(aq)->NaNo3 + CaCO3
Co(NO3)2(aq) +Na2CO3(aq)+CH3COOH-> NaNo3 + CH3COOCo + H2O
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If 7.60 kJ of heat is needed to raise the temperature of a sample of metal from 12°C to 27°C, how many kilojoules of heat will be required to raise the temperature of the same sample of metal from 39°C to 55°C?
Answer: 8.1067 kJ
Explanation: Please mark this brainliest. the joules necessary to raise the heat of a substance only depends on how much change of temp you need and how much substance is there. In this question the amount is constant. Since it is 7.6kJ to change it by 27-12=15C, and 55-39=16C. The number of kilojoules is 16/15 *7.6=8.1067
Question 14 of 26
Write the balanced COMPLETE ionic equation for the reaction when Kl and
AgNO3 are mixed in aqueous solution. If no reaction occurs, simply write
only NR.
AgNO3(aq)+KI(aq)→AgI(s)+KNO3(aq) is the balanced complete ionic equation for the reaction when Kl and AgNO3 are mixed in aqueous solution.
If KI and AgNO3 interact, would a precipitate result?Since KI does not combine with any of the other reagents to produce a white precipitate, 1 must be AgNO3, and 2 must be KI. 3 is presently still a mystery. Both H2SO4 and BaCl2, most likely the latter, can produce some white precipitate when combined with AgNO3, and neither reacts with KI.
An ionic equation is a chemical equation in which the electrolytes in aqueous solution are described as dissociated ions. It is similar to a molecular equation in that it represents compounds as molecules.
AgX (X = Cl, Br, or I) precipitates from the reaction of AgNO3 with halide ion solutions are employed in photographic films.
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Draw the net force arrow on the diagram and state the direction. Net force direction =
The magnitude of the net force is 20.12 N in a direction 26.56° South of East.
What is the net force and the direction of the force?The net force in the given forces in the diagram s given below as follows:
Force 1, F₁ = 18 N force acting in a direction to the east
Force 2, F₂ = 9 N force acting in a direction south of the object.
The two forces form two sides of a right-angle triangle
Net force is determined using Pythagoras' rule as follows:
Net force, F = √(F₁² + F₂²)
Net force = √ (18² + 9²)
Net force = √ (324 + 81)
Net force = √ 405
Net force = 20.12 N
The direction of the Net force, θ, is determined as follows;
θ = tan⁻¹ (9 / 18)
θ = tan⁻¹ 0.5
θ = 26.56° South of East
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Describe the structure of fatty acids, triglycerides phospholipids, and steroids.
The structure of fatty acids involves long carbon-based chains with a carboxyl group (―COOH) located in the end, triglycerides phospholipids contain a phosphate group and glycerol, while steroids are cyclic and they contain C atoms linked via 4 fused rings.
What are lipids?Lipids are a broad category of biomolecules that include fatty acids, triglycerides phospholipids, and steroids. For example, fatty acids are long carbonated chains that contain exactly identical CH2 groups in the interior of the molecule and a carboxyl group (―COOH) located at one extreme side.
Triglycerides phospholipids are composed of three fatty acids chains linked to a glycerol backbone and also a phosphate group that may confer polar properties to the molecule.
Finally, steroids are another important class of lipids composed of several carbon-based fused rings.
Therefore, we can conclude that fatty acids, triglycerides phospholipids, and steroids are structurally different lipids that are mainly composed of carbon-based structures.
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Calculate the wavelength of a photon (in nm) that has the frequency of 5.66x10^14 Hz
ANSWER
The wavelength of the photon is 0.0053nm
STEP-BY-STEP EXPLANATION:
Given data
Frequency of the photon = 5.66 x 10^-4 Hz
Let x represents the wavelength of the photon
To determine the wavelength of the photon, we need to apply the below formula
[tex]\begin{gathered} C\text{ = f x }\lambda \\ \text{where} \\ c=\text{ sp}eed\text{ of light} \\ f\text{ = frequency} \\ \lambda\text{ = wavelength} \end{gathered}[/tex]Recall that, the speed of light is 3 x 10^8 m/s
The next process is to substitute the values into the above formula
[tex]\begin{gathered} c\text{ = f}\lambda \\ \text{Divide both sides by f} \\ \frac{c}{f}\text{ = }\frac{f\lambda}{f} \\ \lambda\text{ = }\frac{c}{f} \\ \end{gathered}[/tex][tex]\begin{gathered} \lambda\text{ = }\frac{3\cdot10^8}{5.66\cdot10^{14}} \\ \lambda\text{ = }\frac{3}{5.66}\cdot10^{8\text{ - 14}}^{} \\ \lambda\text{ = 0.53 }\cdot10^{-6} \\ \lambda\text{ = 5.3 }\cdot10^{-7}m \\ \lambda\text{ =}0.0053nm \end{gathered}[/tex]Therefore, the wavelength of the photon is 0.0053nm
A student determines the density of an object to be 0.761g/mL. This type of data is
If a student determines the density of an object is 0.761g/mL, then this type of data is quantitative continuous data.
What is quantitative continuous data?In mathematics, the expression quantitative continuous data is used to denote a type of data that can be expressed as a continuous range of variations instead of discrete variation.
Quantitative continuous data are a special class of mathematical numeration data that may include both decimals and factions and therefore represent an infinite number of possibilities in a given range for a particular parameter to be measured in normal conditions.
Therefore, with this data, we can see that quantitative continuous data are expressed by decimals and or fractions and they represent infinite values for a particular mathematical range, thereby being distinct from discrete values that are represented by different types of finite values which do not include decimals.
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How many degrees will 340 J raise the temperature of 6.8 g of water
The temperature raised is 11.9 degrees as the heat capacity is 340J
What is heat capacity ?
Heat Capacity is the quantity of energy needed to raise a substance's temperature by one degree Celsius. It can also be thought of as the proportion of energy transmitted to an item to the rise in temperature that follows.
The heat capacity measurement is in Joules per degree Celsius as well. Because it is based on the object's mass. Additionally, it is frequently stated in terms of 100 grammes in order to facilitate comparisons between objects of similar mass.
Q = m*c*T
Q = heat energy
m = mass of substance
c = specific heat capacity
T = temperature
Q = 6.8*4.2*T
T = 340/6.8*4.2
T =11.90 celsius
The temperature raised is 11.9 degrees as the heat capacity is 340J
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Calculate the molarity of an acetic acid solution if 38.9 mL of an HC2H3O2 solution is titrated with 26.7 mL of a 0.114 MKOH solution:HC2H3O2(aq)+ KOH(aq)→H2O(l)+ KC2H3O2(aq) Express your answer with the appropriate units.
Explanation
Given:
CH₃COOH(aq) + KOH(aq) → H2O(l)+ KC2H3O2(aq)
Volume of acetic acid = 38.9 mL = 0.0389 L
Voume of KOH = 26.7 mL = 0.0267 L
Molarity of KOH = 0.114 M
Required: The molarity of an acetic.
Solution
Step 1: Find the moles of KOH
n = C x V where n is the moles, C is the concentration and V is the volume
n = 0.114 M x 0.0267 L
n = 0.00304 mol
Step 2: Find the moles of acetic acid using stoichiometry
The molar ratio between acetic acid and KOH is 1:1
Therefore the moles of acetic acid = 0.00304 mol
Step 3: Calculate the molarity of acetic acid
C = n/V
C = 0.00304/0.0389
C = 0.0781 M
Solution
Molarity of acetic acid = 0.0781
The severity of a tropical storm is related to the depressed atmospheric pressure at its center. In August 1985, Typhoon Odessa in the Pacific Ocean featured maximum winds of about 90 mi/hr and pressure that was 40.0 mbar lower at the center than normal atmospheric pressure. In contrast, the central pressure of Hurricane Andrew (pictured) was 90.0 mbar lower than its surroundings when it hit south Florida with winds as high as 165 mi/hr.
If a small weather balloon with a volume of 50.0 L at a pressure of 1.00 atmosphere was deployed at the edge of Typhoon Odessa, what was the volume of the balloon when it reached the center?
If a small weather balloon with a volume of 50.0 L at a pressure of 1.00 atm was developed at the edge of Typhoon odissa , the volume of the balloon when it reaches the center was 52.63 L
According to boyle's law :
P1V1 = P2V2
here:
P1 = 1 atm
V1 = 50.0 L
P2 = ( 1atm - 0.050 atm ) = 0.95 atm
V2 = ?
V2 = P1V1/P2
V2 = (1 × 50.0 ) / 0.95
= 52. 63 L
Thus, If a small weather balloon with a volume of 50.0 L at a pressure of 1.00 atm was developed at the edge of Typhoon odissa , the volume of the balloon when it reaches the center was 52.63L
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The diagram shows a controlled experiment designed to test how much time it takes for seeds to
germinate under four different conditions. Four bean seeds were placed in each of four pots. Each pot
contained 100 cubic centimeters of soil. All four pots were placed on the same sunny windowsill. A
different amount of water was placed in each pot.
Identify the independent variable:
The independent variable is amount of water
It is a variable that stands alone and isn't changed by the other variables you are trying to measure called independent variable
Here given data is four bean seeds were placed in each of four pots. Each pot contained 100 cubic centimeters of soil All four pots were placed on the same sunny windowsill A different amount of water was placed in each pot then in the first pot 0ml of water are placed and in the second pot 10ml water are placed and in the third pot 20ml water are placed and in the fourth pot 40ml water are placed so, because of high concentration of water the seed germinate in fourth pot are fast other than three pot and all constant in all four pot are soil seed sunrays or container this all are same only amount of water are different and dependent variable is germination
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if the fire has already started how would you ensure that there is no continuous supply of oxygen and ignition temperature is not reached
Answer:
However, ignition temperature is the lowest temperature at which a volatile material will be vaporised into a gas which ignites without the help of any ignition source. The ignition temperature is different from flash point since
The fire can be stopped by removing the supply of oxygen by blanketing the fire with foam, sand, etc. The temperature can be lowered by using water. Using the nitrogen tank to reduce the oxygen concentration can extinguish the fire.
What is ignition temperature?Ignition Temperature can be described as the minimum temperature required by the substance to burn or catch fire. Burning or Combustion can be defined as a spontaneous as well as an exothermic process.
This process is exothermic in nature as heat is released during the process. We give energy to the substance just to begin the process and combustion will happen until the whole substance undergoes combustion.
Combustion is dependent on many factors such as the nature of the substance, the amount of oxygen present as combustion occurs in the presence of oxygen, the surface area of the substance, etc.
The amount of oxygen is an important factor as it enables how efficiently the combustible material undergoes combustion. Since combustion is an exothermic process, there are a variety of fuels and by burning them we generate energy.
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Which of the following materials is a substance?
gasoline
air
silver
stainless steel
Answer: The correct answer is silver.
Explanation:
Matter that has a consistent and uniform composition—the same number and kind of atoms bound in the same way—is referred to as a substance. The substances are either elements or compounds. Only silver is a substance out of the alternatives offered because it is an element and all silver materials only contain silver atoms. In the same way that gasoline is a mixture of liquids whose composition can change, air is a mixture of different gases, and steel is an alloy (a mixture of compounds and elements) whose composition can change. Therefore the silver is the correct answer.
Should you use the flash above why or why not
Should you use the flash above because in the above its dark at night
Flash is a popular authoring software developed by macromedia is used to create vector graphics based animation programs with full-screen navigation interfaces, graphic illustrations, and simple interactivity in an resizable file format that is small enough to stream across a normal modem connection and we should use flash because creating games, making presentations, animations, visualizations, webpage components, and many other interactive applications and at the above we should use flash because its so dark at night
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QUESTION 2
What symbol is used to represent the factor 10²?
K
P
р
H
Answer:
D. h
Explanation:
hecto (h) = 10^2
To find the volume of your element, you completed water displacement, which is calculated by Final volume - Initial volume. Originally 14.0 mL of water was placed into the graduated cylinder. After you object was placed into the graduated cylinder, the water level raised to 20.6 mL. Calculate the volume of the object.
The volume of the object is 6.6 cm³
The amount of space occupied by a three dimensional figure as measured in cubic units and when an object enters water it pushes out water to make room for itself and the object pushes out a volume of water that is equal to its own volume and this is called displacement
So here given data is 14.0 mL of water was placed into the graduated cylinder and then the water level raised to 20.6 mL so we have to find volume = ? here final volume = 20.6 mL and initial volume = 14.0 mL
Volume = final volume - initial volume
Volume = 20.6 mL - 14.0 mL
Volume = 6.6 cm³
The volume of the object is 6.6 cm³
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Look at the line segment in the coordinate grid.
A(-4,-2)
B(5,5)
What is the length of segment AB ?
The length of segment AB is determined as 11.4 units.
What is distance between two points?
The distance between two points is the length of the line segment that connects the two points in a plane.
The length of segment AB is the distance between point A and point B, which is calculated as follows;
|AB| = √[(x₂ - x₁)² + (y₂ - y₁)²]
where;
x₁ is the x - component of point Ax₂ is the x - component of point By₁ is the y - component of point Ay₂ is the y- component of the point B|AB| = √[(x₂ - x₁)² + (y₂ - y₁)²]
|AB| = √[(5 - - 4)² + (5 - -2)²]
|AB| = √[(9)² + (7)²]
|AB| = 11.4 units
Thus, the length of segment AB is the distance between point A and B.
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What are the products of the neutralization reaction between HCI and
Ca(OH)2?
Explanation:
The final products of the reaction between HCl and Ca(OH)2 can be Ca(OH)Cl, CaCl2, or both simultaneously depending on the temperature, HCl concentration and reaction time
which type of wave has the highest frequency?
Answer:
Gamma rays have the highest frequency.
Explanation:
science.
Question 1
Concentrated HCl(aq) is 37.2% HCI by mass. If the density of the solution is
1.19g/mL, how many grams of HCI is in 1.75 L of concentrated HCI?
438 m g l of HCI is in 1.75 L of concentrated HCI .
What does concentration of acid means?A specific amount of solution's concentration relates to the amount of acid or basic that is present. If there is a lot of acid or base in a little amount of solution, it is said to be concentrated. If there is little acid or base in a given volume of solution, it is said to be diluted. Acidic is defined as having a pH below 7. Once the pH reaches 7, it is referred to as basic. Hydronium concentrations in acidic solutions are high, while hydroxide concentrations are low. Hydroxide concentrations in basic solutions are high, while hydronium concentrations are lower. The stronger an acid is, the lower the pH is for a given concentration in aqueous solution. Acid solutions have a pH that decreases with increasing concentration.
the quotient….
Molality = moles of solute/kilograms of solvent .
Whereas…
Molarity = moles of solute/volume of solution in liters.
It's only an estimate, but 1.18 g/mL x 1000 mL x 0.37 = around 437 g.
Then, mols in that 1 L = grams/molar mass
= approximately 437/36.5
= roughly 12 M, according to a different calculation.
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You have 2.2mol Xe and 2.0mol F2, but when you carry out the reaction you end up with only 0.25mol XeF4. What is the percent yield of this experiment?: Xe(g) + 2F2(g) -> XeF4(g)
If 2.2 mol Xe and 2.0 mol [tex]F_2[/tex] reacts to produce 0.25 mol [tex]XeF_4[/tex], the percent yield of the experiment will be 25%.
What is the percent yield of an experiment?The percent yield of an experiment is the amount of the actual yield of the experiment relative to the theoretical yield of the same experiment.
Mathematically; percent yield = actual yield/theoretical yield x 100%
In the illustrated experiment, the mole ratio of Xe and [tex]F_2[/tex] is 1:2. With 2.2 mol Xe reacting against 2.0 mol [tex]F_2[/tex] , it means [tex]F_2[/tex] is limited in availability with Xe being excessive.
The mole ratio of [tex]F_2[/tex] and [tex]XeF_4[/tex] is 2:1. Thus, the mole of [tex]XeF_4[/tex] that should be theoretically produced would be half of the mole of [tex]F_2[/tex] that reacts.
Thus, mole of [tex]XeF_4[/tex] = 2/1
= 1
But only 0.25 mol of [tex]XeF_4[/tex] were produced.
Percent yield = 0.25/1 x 100%
= 25%
The percent yield of the experiment is, therefore, a paltry 25%.
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**NEED ANSWER ASAP, H.W QUESTION**
How does the Sun's magnetic field affect the corona?
Answer:
The surface of the Sun is covered in magnetic fields. This is the force that makes magnets stick to metal, like the door of your refrigerator. The Sun's magnetic fields affect charged particles in the corona to form beautiful features. These include streamers, loops, and plumes.
which of the following reactions is balanced and shows complete combustion
The following reactions is balanced and shows complete combustion are
A)2C₅H₁₂ + 11O₂ -----> 10CO + 12H₂O
D) C₅H₁₂ + 8O₂ -----> 5CO₂ + 6H₂O
A) 2C₅H₁₂ + 11O₂ -----> 10CO + 12H₂O
In this reaction,
Reactants products
C 10 10
H 24 24
O 22 22
Reactants and products have same no. of atoms .
therefore this reaction is balanced and shows complete combustion.
B) 2C₅H₁₂ + 11O₂ -----> 12CO + 10H₂O
Reactants Products
C 10 12
H 24 20
O 22 22
this reaction is not balanced.
C) C₅H₁₂ + 8O₂ -----> 6CO₂ + 5H₂O
Reactants Products
C 5 6
H 12 10
O 16 18
This reaction is not balanced,
D) C₅H₁₂ + 8O₂ -----> 5CO₂ + 6H₂O
Reactants Products
C 5 5
H 12 12
O 16 16
Reactants and products have same no. of atoms .
therefore this reaction is balanced and shows complete combustion.
Thus, The following reactions is balanced and shows complete combustion are
A)2C₅H₁₂ + 11O₂ -----> 10CO + 12H₂O
B) C₅H₁₂ + 8O₂ -----> 5CO₂ + 6H₂O
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Answer:
D
Explanation:
I got the answer right
Anode? / Cathode? - Oxidation? / Reduction?.
This example is similar to the previous one. Recall that oxidation reactions occur at the anode and reduction reactions occur at the cathode.
Oxidation is the process in which a compound donates electrons and as a result increases its oxidation state. When a compound receives electrons, it will be reduced and its oxidation state will decrease.
In this case, we have an element in its natural state (Zn), that is, it has a neutral charge equal to zero. After the reaction we have the same element with an oxidation state greater than and equal to +2, therefore the element was oxidized and donated two electrons corresponding to the difference in oxidation state.
Answer: Anode, oxidation
What might happen if your lab group had such a cluttered lab area
Answer:
depending on what you guys are doing someone could get hurt or knock something over and break it
Explanation:
Convert 75 ML to GL
Problems
What is the density of an object with a mass of 250 g and a volume of 300 mL?
The definition of density is the mass of a substance per unit of volume. The Latin letter D may also be used, however the symbol is most usually employed to denote density. Mass divided by volume gives the density value:
D = m/v
= 250/300
= 0.833 g/ml
A physical body's mass is its overall amount of matter. Inertia, or the body's resistance to acceleration when a net force is applied, is also measured using this phrase. The strength of a body's gravitational pull on other bodies depends on its mass. The kilogram serves as the foundational mass unit in the SI.
The amount of three-dimensional space that is occupied is measured in volume. Imperial or SI-derived units are frequently used in its mathematical expression. The concepts of volume and length are related.
Typically, there are two forms of density: absolute density and relative density. Relative density, also known as specific gravity, is the ratio of a substance's density to the density of a reference material. Water is frequently used as the reference material.
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Consider the following ionic
compounds and determine which
has the higher melting point.
A. BeCl₂
B.Al₂S3
Answer:
Al2S3
Explanation:
Al2S3 has ions which have a higher magnitude of charge compared to BeCl2. This higher charge creates stronger attractive forces between molecules, holding them together even at high temperatures. Another simple way to compare the melting points is to multiply the charges of the ions together and compare those values. BeCl2 would be 2*1 because of Be2+ and Cl (1)-. Al2S3 would be 2*3 because of S2- and Al3+. Since 2*3 is more than 2*1, Al2S3 has a higher melting point. I think this is a repeat question
I need help with this homework assignment problem
Answer:. Chemical symbol for ion is : S, 16 electrons,
Explanation: If you add the electrons (which is the exponents of each one you get:
2 + 2+ 6+2+4 = 16. So the atom has 16 protons and 16 neutrons. Neutrons have no charge and protons are positive so to balance out the 16 positive protons there are 16 electrons. The atomic number is 16 and on the periodic table that is sulfur. The symbol is S.
3 d orbitals are vacant in sulphur but are accessible, so it can make strong covalent bonds.
Answer:
A. The ion is Ar^2+
B. 18
C. 0
Explanation:
There are total of 2 + 2 + 6 + 2 + 4 = 16 electrons
since the cation is +2, it's neutral state should be 16 + 2 = 18
A. The ion is Ar^2+
B. 18
C. since 3p => 4s => 3d, so there is no 3d
5) According to the quantum theory of atomic structure, an atom has all EXCEPT which of these
characteristics?
a) Electrons in atoms have quantized energies
b) Electrons in atoms are bound to the nucleus by electrostatic attraction
c) When electrons are excited, only discrete amounts of energy can be absorbed
d) The ground state of an atom represents the absence of quantized energy
According to the quantum theory of atomic structure, an atom has all the characteristics except d) The ground state of an atom represents the absence of quantized energy.
In atomic structure, what does quantum mechanics mean?Science that studies how matter and light behave on an atomic and subatomic scale is known as quantum mechanics.
It makes an effort to explain and describe the characteristics of molecules, atoms, and their building blocks, including electrons, protons, neutrons, and other less familiar particles like quarks and gluons.
What is the quantum theory?Modern physics’ theoretical underpinning, quantum theory, describes the nature and behavior of matter and energy at the atomic and subatomic scales.
Quantum physics and alongside quantum mechanics are the terms that refer to the nature and behavior of matter and the energy present at that level.
How can quantum mechanics explain how an atom stays stable?Atoms can be stable because the attraction caused by potential and the spreading out caused by quantum mechanics balance each other out.
The orbit of an electron around an atom in classical mechanics is unstable because the energy required to maintain the orbit is released as light.
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how can carbon release the iron atoms from iron oxides
Iron atoms can be released from iron oxides as carbon has high affinity for oxygen compared to Iron
When two atoms come in contact with each other, interaction happens between the electrons and nucleus. This might result in bond formation between them. The resultant compound will be a molecule i.e., when two atoms’ bonds together, it would result in a molecule.
Iron oxide has 2 iron atoms and 3 oxygen atoms. When heat is applied, bonds between the molecules would break and result in the formation of atom.
Carbon has higher affinity for oxygen compared to Iron. Thus, carbon would interact with formed oxygen atoms and result in carbon dioxide. The iron atoms are free now as it does not have anything to react with.
Thus, carbon with high affinity for oxygen would help to separate iron from iron oxide.
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