which atom in the br-f molecule has a partial positive charge (δ⁺)?
A) Br
B) F
C) Both
D) Neither
Answers
In the Br-F molecule, the atom with a partial positive charge (δ⁺) is: A) Br
When answering questions on the platform Brainly, you should always be factually accurate, professional, and friendly. Additionally, it is important to be concise and not provide extraneous amounts of detail.What is the partial charge of the atom in the Br-F molecule?In the Br-F molecule, the atom that has a partial positive charge is the bromine atom (Br).
This is because the fluorine atom has a higher electronegativity than the bromine atom, causing the electrons to be more strongly attracted to the fluorine atom. As a result, the bromine atom ends up with a partial positive charge (δ⁺), while the fluorine atom has a partial negative charge (δ⁻).Thus, the correct answer is A) Br.
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A scientist needs 10 l of a solution that is 60% acid. She has a 50% acid solution and a 90% acid solution she can mix together to make the 60% solution. Let x represent the number of liters of the 50% solution. Let y represent the number of liters of the 90% solution. Which equation represents the total liters of acid that are needed?.
Answers
0.5 * x + 0.9 * y = 0.6 * is the equation that represents the total liters of acid that are needed.
What is an equation?
An equation is a mathematical statement that asserts the equality of two expressions. It uses an equal sign (=) to show that the expressions on either side of the sign have the same value. Equations are typically used to solve problems by finding the unknown values of certain variables.
The total amount of acid in the 50% solution can be represented as 0.5 * x liters.
The total amount of acid in the 90% solution can be represented as 0.9 * y liters.
The total amount of acid in the mixture of the two solutions should equal to 0.6 * liters, which is equal to the desired 60% solution.
So, the equation representing the total liters of acid needed is:
0.5 * x + 0.9 * y = 0.6 *
This equation represents the relationship between the liters of the two solutions used and the total amount of acid in the solution.
Therefore, 0.5 * x + 0.9 * y = 0.6 * is the equation.
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As more NaCl(s) is dissolved in a dilute, unsaturated NaCl(aq) solution, the conductivity of the solution
A) decreases as the ion concentration decreases
B) decreases as the ion concentration increases
C) increases as the ion concentration decreases
D) increases as the ion concentration increases
Answers
Answer: D) increases as the ion concentration increases.
The conductivity of a solution is related to the number of ions present in it. When NaCl is dissolved in water, it dissociates into its constituent ions, Na+ and Cl-. As more NaCl(s) is dissolved in the solution, the concentration of these ions in the solution increases, which in turn increases the conductivity of the solution. Therefore, as more NaCl(s) is dissolved in a dilute, unsaturated NaCl(aq) solution, the conductivity of the solution will increase.
The conductivity of the solution increases as the concentration of ions increases. Therefore, option D is correct.
How does the conductivity of a solution depend on the concentration of ions?The conductivity of a solution is directly proportional to the concentration of ions in the solution. Conductivity is measured as the movement of charged ions through a solution is what allows for the flow of electrical current. In general, the more ions that are present in a solution, the higher the conductivity of the solution will be. This is because there are more charged particles available to carry electrical charge through the solution.
The relationship between conductivity and ion concentration can be described by the equation: conductivity = k × concentration
Where k is a constant of proportionality that depends on the specific ions and the properties of the solution, and concentration is the concentration of ions in the solution. Thus, option D is correct.
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If Pulley A is 34% efficient and Pulley B is 85% efficient, what can we conclude? Which pulley would you rather use to lift a cement block?
Explain! This is science!!!
Answers
Answer:
I will use pulley b
Explanation:
because the pulley with more efficency can carry out the work better
using average bond enthalpies (linked above), estimate the enthalpy change for the following reaction: 2co(g) o2(g)2co2(g)
Answers
The estimated enthalpy change for the reaction 2CO(g) + O2(g) → 2CO2(g) is approximately -995 kJ/mol.
To estimate the enthalpy change for the reaction 2CO(g) + O2(g) → 2CO2(g) using average bond enthalpies, we need to consider the bonds broken and formed in the reaction.
In the reactants, we have two CO molecules and one O2 molecule. Each CO molecule has a carbon-oxygen double bond (C=O), and the O2 molecule has a double bond between the two oxygen atoms (O=O).
To calculate the energy required to break these bonds, we refer to the average bond enthalpy values. The average bond enthalpy for a carbon-oxygen double bond (C=O) is approximately 745 kJ/mol, and the average bond enthalpy for an oxygen-oxygen double bond (O=O) is approximately 495 kJ/mol.
In the products, we have two CO2 molecules. Each CO2 molecule has two carbon-oxygen double bonds (C=O).
To calculate the energy released when these bonds form, we multiply the number of bonds formed by their respective average bond enthalpy.
The energy required to break the bonds in the reactants is:
2(C=O) + O=O = 2(745 kJ/mol) + 495 kJ/mol = 1985 kJ/mol
The energy released when the bonds form in the products is:
4(C=O) = 4(745 kJ/mol) = 2980 kJ/mol
The overall enthalpy change is the difference between the energy required to break the bonds and the energy released when the bonds form:
Enthalpy change = Energy required to break bonds - Energy released when bonds form
Enthalpy change = 1985 kJ/mol - 2980 kJ/mol
Enthalpy change ≈ -995 kJ/mol
Therefore, the estimated enthalpy change for the reaction 2CO(g) + O2(g) → 2CO2(g) is approximately -995 kJ/mol.
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Can you create or destroy matter in a chemical reaction?
Answers
The matter cannot be created or destroyed in a chemical reaction. So that answer is No
According to the law of conservation of mass, matter can neither be created nor destroyed in a chemical reaction. The total mass of the reactants must be equal to the total mass of the products, meaning that atoms are rearranged and combined in different ways, but no atoms are lost or gained.
The law of conservation of mass is a fundamental principle in chemistry, and it highlights the notion that matter is conserved throughout chemical reactions. This understanding allows chemists to accurately predict and balance chemical equations, ensuring that the total number of atoms on each side of the reaction remains constant.
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which layer of the earth has the lowest density
Answers
Answer:
lithosphere
Explanation:
Earth's interior layers are ordered by density. The densest layer is the solid metal inner core, the mantle is of intermediate density, and the least dense layer is the lithosphere, particularly the continental lithosphere.
The crust is the layer of the earth with the lowest density.
The crust is the rock layer that is the lightest and most buoyant on Earth. 41% of the Earth's surface is covered by continental crust, with a quarter of that covered by ocean floor. The thickness of the continental crust is 20 to 80 kilometers. Four billion years of Earth's history are stored in its rocks.
The crust is the outermost layer of the Earth, and it is only about 5-70 km deep. The mantle is the layer beneath the crust, which is about 2,900 km thick and has a thickness that varies. The core is divided into two sections: the inner core, which is solid, and the outer core, which is liquid. The Earth's surface is made up of several plates, which are continuously changing due to forces within the Earth.
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In the experiment today, what is the total molar concentration (M) of methyl red (Hin) for each of your standard solutions? Consider sig figs (but not units) when reporting your answer here... Table 1 - Composition of Four Solutions Acidic Standard Basic Standard 10.0 mL of stock methyl red 10.0 mL of stock methyl red 10.0 mL of 0.10 MHCI 25.0 mL of 0.10 M sodium acetate deionized water to 100.0 mL deionized water to 100.0 mL Solution 1 Solution 2 10.0 mL of stock methyl red 10.0 mL of stock methyl red 25.0 mL of 0.10 M sodium acetate 25.0 mL of 0.10 M sodium acetate 25.0 mL of 0.10 Macetic acid 10.0 mL of 0.10 M acetic acid deionized water to 100.0 mL deionized water to 100.0 mL
Answers
(C1 × 10.0 mL) / 100.0 mL.
Explanation:
To determine the total molar concentration (M) of methyl red (Hin) for each of your standard solutions, you need to use the dilution formula: C1V1 = C2V2, where C1 is the initial concentration, V1 is the initial volume, C2 is the final concentration, and V2 is the final volume.
For all solutions, 10.0 mL of stock methyl red is added. The molar concentration of the stock methyl red is not provided in the question, so we will represent it as C1.
The final volume for each solution is 100.0 mL. Therefore, V2 = 100.0 mL.
Now we can find the molar concentration (C2) of methyl red (Hin) for each standard solution:
C1 × 10.0 mL = C2 × 100.0 mL
C2 = (C1 × 10.0 mL) / 100.0 mL
For each solution, the total molar concentration (M) of methyl red (Hin) is (C1 × 10.0 mL) / 100.0 mL. Make sure to consider significant figures when reporting your answer.
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Can I find a tutor help me wit this question?
Answers
Chemistry =>Introduction to Chemistry => Scientific Method
A scientific method corresponds to a methodology to obtain new knowledge.
We must start from an idea, an assumption of how a compound or a process behaves, this is our hypothesis.
Following this, we must identify what can affect our process, what are the variables, and what will be the response variable, for this we carry out an experiment.
Once the experiments have been carried out, we must analyze the results, draw conclusions as to why the behavior occurs, and if our hypothesis is true or not.
It is useless for us to obtain new knowledge if we do not share it, We have to share the results, in this way other people can start from that knowledge to create another,
Therefore, the answer will be:
1. Make a hypothesis
2. Conduct an experiment
3. Analyze the experiment data
4. Communicate the results
.
The earth is slightly tilted on its axis. How much is it tilted?
A. 23.5 degrees
B. 28 degrees
C. 20.5 degrees
D. 25 degrees
Answers
Answer: D 25 degrees
Explanation: The reason because is 25x4=100 and slightly tilted =1/4 of the earth which is 25
How do i do the ideal gas law?
Answers
Answer:
The ideal gas law relates the pressure, volume, temperature, and number of moles of a gas using the equation:
PV = nRT
where P is the pressure of the gas in atmospheres (atm), V is the volume of the gas in liters (L), n is the number of moles of the gas, R is the gas constant (0.08206 L atm/mol K), and T is the temperature of the gas in Kelvin (K).
To use the ideal gas law, you need to know at least three of the four variables in the equation and then solve for the fourth variable. Here are the steps to follow:
Identify the variables that are given and the one that needs to be solved for.
Rearrange the ideal gas law equation to solve for the unknown variable. For example, if you need to solve for pressure, the equation becomes P = nRT/V.
Substitute the known values into the rearranged equation and solve for the unknown variable. Be sure to convert the temperature to Kelvin if it is given in Celsius by adding 273.15.
Make sure to include units in your final answer.
For example, let's say you have a gas with a volume of 2.5 L, a temperature of 298 K, and 0.5 moles of the gas, and you need to find the pressure of the gas. Using the ideal gas law:
PV = nRT
P = nRT/V
P = (0.5 mol)(0.08206 L atm/mol K)(298 K) / 2.5 L
P = 6.11 atm
So the pressure of the gas is 6.11 atm.
A lump of zinc is tossed into a beaker of 500L of 14M hydrochloric acid. this reaction produces Hydrogen Gas and zinc (II) chloride. If the hydrogen gas is combusted and produces 645L of water vapor at 400 kelvin and 1.75 atm, what is the mass of the zinc?
Answers
If the hydrogen gas is combusted and produces 645L of water vapor at 400 kelvin and 1.75 atm, 2796.96 g mass of the zinc is produced .
Using the ideal gas law equation:
PV = nRT
n = (PV) / (RT)
= (1.75 atm * 645 L) / (0.0821 atm·L/(mol·K) * 400 K)
= 42.71 moles
the balanced equation for the reaction between zinc and hydrochloric acid:
Zn + 2HCl -> \(ZnCl_{2}\) + \(H_{2}\)
1 mole of zinc produces 1 mole of hydrogen gas. Therefore, the moles of zinc are also 42.71.
The molar mass of zinc is 65.38 g/mol.
Mass of zinc = moles of zinc * molar mass of zinc
= 42.71 moles * 65.38 g/mol
= 2796.96 g
Therefore, the mass of the zinc is 2796.96 grams.
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An atom has a mass number of 9 and 5 neutrons What is its atomic number?
A. 14
B. 11
C. 19
D. 4
Answers
Answer:
D. 4
Explanation:
mass number - number of neutrons = number of protons
The heat capacity of solid iron is 0.447 Jewels per gram in celsius. If the same quantity of energy as in #3 were transferred to a 450g chunk of iron at 20 Celsius, what would be the final temperature?
Answers
After transferring 65 kJ of heat, the iron's final temperature will be 343.14.
What is specific heat?The amount of heat necessary to increase the temperature of 1 g of a substance by 1 degree Celsius is known as the specific heat.
One can provide the specific heat by:
Q = mcΔT
Q equals 65 kJ of specific heat
0.447 J/g is the heat capacity, or c.
450 g is the iron's mass, or m.
ΔT = temperature change, or final temperature minus initial temperature.
ΔT=20 - final temperature
The values being entered into the equation:
65000 J = 0.447 J/g 450 g
(Final temperature - 20) 65000 J = 201.15
Temperature at the end minus 20 = 323.14
Temperature at the end: 343.14.
After transferring 65 kJ of heat, the iron's final temperature will be 343.14.
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According to the
graph, what happens
to the concentration
of A over time?
Concentration (M)
Reaction: 2A A₂
Time (sec)
A. It decreases and then levels out.
B. It decreases consistently.
C. It increases and then levels out.
D. It increases consistently.
Answers
The concentration of A decreases and then levels out. Option A
How does concentration of the reactant change?
In many chemical reactions, a reactant is consumed as the reaction progresses, leading to a decrease in its concentration over time. The reactant molecules are transformed into products, and as the reaction proceeds, the concentration of the reactant gradually diminishes.
At equilibrium, the concentrations of both reactants and products remain relatively constant over time, although they can coexist.
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2. use le chatelier's principle to explain why each form of the indicator is dominant at relatively low ph and at high ph.
Answers
Answer: Le Chatelier's principle states that a system at equilibrium will respond to any stress or change in conditions by shifting the equilibrium position to counteract the stress and restore equilibrium. In the case of indicators, the color of the indicator molecule depends on its protonation state, which in turn depends on the pH of the solution.
At relatively low pH, the solution is acidic and has a high concentration of H+ ions. In this condition, the equilibrium of the indicator molecule will shift towards the protonated form (HIn), as per Le Chatelier's principle. The H+ ions from the solution will combine with the indicator molecule to form HIn, which has a different color than its deprotonated form (In-).
Therefore, at low pH, the dominant form of the indicator is HIn. On the other hand, at high pH, the solution is basic and has a low concentration of H+ ions. In this condition, the equilibrium of the indicator molecule will shift towards the deprotonated form (In-), as per Le Chatelier's principle.
The low concentration of H+ ions in the solution makes it difficult for the HIn molecules to remain protonated, and they will undergo deprotonation to form In-. At high pH, the dominant form of the indicator is In-.
In summary, Le Chatelier's principle explains why the dominant form of the indicator molecule changes as the pH of the solution changes. At low pH, the equilibrium shifts towards the protonated form (HIn), and at high pH, the equilibrium shifts towards the deprotonated form (In-).
why does helium fusion require higher temperatures than hydrogen fusion
Answers
Helium fusion requires higher temperatures than hydrogen fusion because of the increased electrostatic repulsion between helium nuclei.
Helium has two protons, while hydrogen only has one, the strong nuclear force, which binds the atomic nuclei together, is powerful but short-ranged. To overcome the electrostatic repulsion and allow the strong nuclear force to act, helium nuclei must come very close to each other. At higher temperatures, the particles have greater kinetic energy, which increases the chances of helium nuclei colliding with enough force to overcome the repulsion.
The temperature required for helium fusion, known as the triple-alpha process, is around 100 million Kelvin, significantly higher than the 15 million Kelvin needed for hydrogen fusion through the proton-proton chain reaction. In summary, the increased electrostatic repulsion between helium nuclei and the need for a closer approach for the strong nuclear force to take effect result in helium fusion requiring higher temperatures than hydrogen fusion.
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Match each energy transformation to the correct image. ANSWER FAST PLS!!! THIS IS FOR 20 POINTS!!! AND I WILL MARK BRAINLIEST IF CORRECT!!! this is on edementum btw
Answers
The Light Is- Electric To Radiant
Car Battery- Chemical To Electric
Wind Thingy- Motion To Electric
Fan- Electric To Motion
Guitar- Electric To Sound
Hope This Helps!!
Suppose you have 100.00mL of a solution of a dye and transfer 2.00mL of the solution to a 100.00 -mL volumetric flask. After adding water to the 100.00mL mark, you take 5.00mL of that solution and again dilute to 100.00 mL. If you find the dye concentration in the final diluted sample is 0.000158M, what was the dye concentration in the original solution?
Answers
The dye concentration in the original solution can be calculated using the following equation:
C1V1 = C2V2
Where:
C1 = Initial dye concentration V1 = Initial volume (100.00 mL) C2 = Final dye concentration (0.000158 M) V2 = Final volume (100.00 mL)
Therefore, C1 = 0.000158 x 100.00/2.00 = 0.0079 M.
So, the dye concentration in the original solution was 0.0079 M.
It is important to note that when diluting a solution, the number of moles of solute (the substance being dissolved) remains constant. This means that the amount of solute in the initial solution is equal to the amount of solute in the final diluted solution, which is why the equation works in the way it does.
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What happens during the rock cycle?
Answers
in a solution, what is the substance that does the dissolving called?
Answers
Answer and Explanation:
The substance that does the dissolving (or dissolves in the solution) is the solute.
- The solute is the substance that is being dissolved
The substance that makes the solute dissolve is called the solvent.
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write and balance the equation showing the reaction between iron (iii) oxide and carbon monoxide to form iron (ii) oxide and carbon oxide. sum the coefficients
Answers
The balanced chemical equation showing the reaction between iron (iii) oxide and carbon monoxide to form iron (ii) oxide and carbon oxide is :
FE2O3 + 3CO → 2FE +3CO2
Unbalanced:
Fe2O3 + CO → Fe + CO2
The atoms of iron on the reactant side is 2 but on the product side is 1, so have to change the coefficient of the iron of the product side. Place 3 with the CO in reactants and 3 with CO2 on the product side.
A balanced chemical equation is defined as the number of atoms of each type in the reaction being equal to the reactants and product sides.
The mass and charge is equal in a balanced chemical reaction.
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What vocabulary term refers to the offspring when it possesses the same trait for both genes?
Answers
Given what we know, we can confirm that the term used to describe an offspring that possesses the same trait for both genes is homzygous.
What does it mean to be homzygous?This is as indicated in the question, it refers to organisms that have inherited the same allele for a gene from both parents. Meaning that both variations of said gene in this individual are the same and therefore, there is no possibility of a distinct expression.
Therefore, we can confirm that the term used to describe an offspring when it possesses the same trait for both genes is homzygous.
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Answer:
Dominant
Explanation:
Dominant, as related to genetics, refers to the relationship between two inherited versions of a gene related to that trait.
chloride per milliliter (MW of CaCl2 = 147) [Round to the nearest whole number 5. What weight of magnesium chloride (MgCl2, formula weight = 95.3) is required to prepare 200 ml solution that is 5.0 mi
Answers
The weight of magnesium chloride required to prepare the 200 ml solution that is 5.0 M is approximately 48 grams.
To calculate the weight of magnesium chloride (\(MgCl_{2}\)) required to prepare a 200 ml solution that is 5.0 M, we need to use the formula: Weight (in grams) = Volume (in liters) × Concentration (in moles/liter) × Molecular Weight (in grams/mole)
First, we convert the volume from milliliters to liters by dividing it by 1000: Volume = 200 ml ÷ 1000 = 0.2 L. Next, we multiply the volume, concentration, and molecular weight: Weight = 0.2 L × 5.0 mol/L × 95.3 g/mol = 47.65 grams
Rounding to the nearest whole number, the weight of magnesium chloride required to prepare the 200 ml solution that is 5.0 M is approximately 48 grams.
This calculation ensures that the desired concentration is achieved by accurately measuring the appropriate amount of magnesium chloride, taking into account its molecular weight and the desired volume of the solution.
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which of the following substances is a weak electrolyte: a) LiOH b) H3COOH c) HNO3 d) Na2SO4
Answers
The substance that is a weak electrolyte is (b) H₃COOH (acetic acid).
The correct answer is (b) H₃COOH (acetic acid).
A weak electrolyte is a substance that partially dissociates into ions when dissolved in water, resulting in a relatively low conductivity. Let's analyze each option:
(a) LiOH (lithium hydroxide) is a strong base and a strong electrolyte. It completely dissociates into Li⁺ and OH⁻ ions in water.
(b) H₃COOH (acetic acid) is a weak acid and a weak electrolyte. It only partially dissociates into H⁺ and CH₃COO- ions in water. Most of the acetic acid molecules remain undissociated.
(c) HNO₃ (nitric acid) is a strong acid and a strong electrolyte. It completely dissociates into H⁺ and NO₃⁻ ions in water.
(d) Na₂SO₄ (sodium sulfate) is a strong electrolyte. It completely dissociates into Na⁺ and SO4²⁻ ions in water.
Therefore, the substance that is a weak electrolyte is (b) H₃COOH (acetic acid).
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A sample of nitrogen gas has a pressure of 9.58 kpa at 539k. if the volume does not change, what will the pressure be at 211k?
Answers
The pressure of the nitrogen gas at 211 K will be approximately 3.76 kPa.
What is the initial pressure of the nitrogen gas?To determine the pressure of the nitrogen gas at 211 K, we can use the ideal gas law, which states that the product of pressure (P) and volume (V) is directly proportional to the product of the number of moles (n) and the gas constant (R), divided by the temperature (T). Since the volume is constant, we can set up the following equation:
(P₁ / T₁) = (P₂ / T₂)
where P₁ and T₁ are the initial pressure and temperature, and P₂ and T₂ are the final pressure and temperature. Substituting the given values:
(9.58 kPa / 539 K) = (P₂ / 211 K)
Solving for P₂:
P₂ = (9.58 kPa / 539 K) * 211 K
P₂ ≈ 3.76 kPa
The pressure of the nitrogen gas at 211 K will be approximately 3.76 kPa.
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What is Ammonium bisulfate as a chemical formula?
Answers
Answer:
Ammonium bisulfate/Formula
(NH4)HSO4
Reason to answer:
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Which of the following does show an oxidation reaction?
(a) Gain of oxygen
(b) Loss of oxygen
(c) Gain of hydrogen
(d) None of the above
Answers
Answer:
Loss of oxygen
Explanation:
Shortcut defination of oxidation and reduction
Oxidation=LEO(Loss of Electron)Reduction=GEO(Gain of Electron)The Roman numeral in manganese (IV) sulfide indicates:
A. the group number on the periodic table
B. the positive charge on the manganese ion
C. the number of manganese ion in the formula
D. the number of sulfide ions needed in the formula
Answers
The Roman numeral in the manganese (IV) sulfide indicates : the positive charge on the manganese ion. The correct option is B.
The Manganese (IV) sulfide, chemical formula = Mn₂S₄ In the compound Manganese (IV) sulfide, the manganese (IV) contains the positively charged cation and the sulfide contains the negatively charged anion. The name of the manganese (IV) sulfide is that each of the manganese atom has the charge of +4.
Manganese = Mn⁴⁺
Sulfide = S²⁻
The chemical formula for the Manganese (IV) sulfide = Mn₂S₄. The Roman numeral in manganese (IV) sulfide shows the positive charge on the manganese ion.
Therefore, the correct option is B.
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84 g of a metal at an initial temperature of 72°C releases 553 J of heat. Calculate the final temperature of the metal if its specific heat capacity is 0.13 J/g•K.
Answers
84 g of a metal at an initial temperature of 72°C releases 553 J of heat, then the final temperature of the metal is 21.36°C if its specific heat capacity is 0.13 J/g•K.
To calculate the final temperature of the metal given its initial temperature of 72°C, the amount of energy released (553 J), and its specific heat capacity (0.13 J/g•K), we can use the following equation:
Q = mc∆T,
where Q is the amount of heat energy released,
m is the mass of the metal (84 g),
c is the specific heat capacity (0.13 J/g•K), and
∆T is the change in temperature. Solving for ∆T gives us:
∆T = Q/mc
∆T = \(\frac{553J}{84g\times0.13\frac{J}{gK}}\) = 50.641
Therefore, the final temperature of the metal is 72°C - 50.641 K = 21.36°C.
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which is the smallest number? a. 2.5 b. 2.9 * 10^-3 c. 4.6 * 10^-4 d. 1.4 * 10^-2
Answers
Answer:
The answer is option c
4.6 × 10^-4
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