Answer:
A. it is the lowest at low temperatures
Explanation:
At low temperature the kinetic energy of a molecule is low. The kinetic energy is directly proportional to the temperature of the molecule. The kinetic energy of a molecule increases with the increase in the temperature that energize the molecules of a substance and makes them to move faster than before.
As the kinetic energy is proportional to temperature so it does not increase with decrease in the temperature (low temperature). The kinetic energy varies with the change in the temperature and it is not same at all temperature. The kinetic energy is highest at high temperature. Thus, option A is correct.
20 POINTS !!!
Based on Gay-Lussac's law, which of the following statements is true for an ideal gas at constant volume and mole amount?
a - the number of collisions is independent of pressure
b - the number of collisions decreases with increase in pressure
c - pressure is directly proportional to the absolute temperature
d - pressure is inversely proportional to the absolute temperature
C. pressure is directly proportional to the absolute temperature
Explanation:
Gay- Lussac's law is defining a relationship between the pressure and temperature at a constant volume for an ideal gas.The law says that when there is an increase in the temperature of the ideal gas then the pressure of the gas is also increasing. There created a direct relationship between temperature and pressure. Option A tells us that collision and pressure are not related which is not true, Option B is saying that as pressure increases the collisions of the gas particles decreases which is not correct, Option C is drawing the correct relationship between pressure and temperature, and option D is talking the reverse of option C which is incorrect. Hence, the answer is CAnswer:
C. Pressure is directly proportional to the absolute temperature.
Explanation:
I took the test :)
Which phrase best describes the main reason scientist perform experiments
Answer: an experiment is an empirical procedure that arbitrates competing models or hypotheses. Researchers also use experimentation to test existing theories or new hypotheses to support or disprove them.
Explanation: I don't know if this helps but if it does let me know.
Final answer:
Scientists perform experiments primarily to test hypotheses, gather data, and validate or disprove their proposed explanations for phenomena. These experiments are essential for the advancement of scientific knowledge and are often peer-reviewed and published if the results are significant.
Explanation:
The main reason scientists perform experiments is to test a hypothesis which is a proposed explanation for a phenomenon, and to answer specific research questions. Experiments are carefully designed to collect data and analyze results objectively. If the results support the hypothesis, further experiments may be conducted to test related hypotheses, or if the results are inconsistent with the hypothesis, it may be discarded for a new alternative hypothesis.
By performing experiments, scientists aim to ensure repeatability and to explore underlying causes for observed phenomena. Experiments are a critical aspect of the scientific method, enabling researchers to extend their knowledge of the natural universe through empirical evidence. The design of an experiment is guided by the goal to make measurements that test the hypothesis, and often involves statistical, mathematical, or graphical analysis of the data collected.
Significant results get published in scientific journals, which serve to communicate the findings and contribute to the body of scientific knowledge. With the advent of open access and electronic journal availability, the dissemination of scientific knowledge has become more accessible.
Which equation has both a liquid and a gas as products? 2 upper H g upper O (s) right arrow 2 upper H g (l) plus upper O subscript 2 (g). 2 upper M g (s) plus upper O subscript 2 (g) right arrow 2 upper M g upper O (s). 1 UJpper K upper C l upper O subscript 3 (s) right arrow 2 upper K upper C l (s) plus 3 upper O subscript 2 (g). Upper M g (s) plus 2 upper H upper C l (a q) right arrow upper H subscript 2 (g) plus upper M g upper C l subscript 2 (a q).
Answer:
A
Explanation:
Calcium nitrate + aluminum hydroxide balanced equation
Answer:
Al(NO3)3 + Ca(OH)2 = Al(OH)3 + Ca(NO3)2.
Explanation:
The balanced equation for the reaction between calcium nitrate and aluminum hydroxide is: Ca(NO3)2 + 2Al(OH)3 → 2Al(NO3)3 + 3Ca(OH)2.
Explanation:The balanced equation for the reaction between calcium nitrate and aluminum hydroxide is:
Ca(NO3)2 + 2Al(OH)3 → 2Al(NO3)3 + 3Ca(OH)2
In this reaction, calcium nitrate reacts with aluminum hydroxide to produce aluminum nitrate and calcium hydroxide.
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Calculate the heat needed to change 3.00 * 10^2 grams of water at 25 degrees celsius to steam at 100 degrees celsius
Answer:
9.4×10⁴J
Explanation:
The specific heat capacity (SHC) of water, which is the amount of energy (J) that it takes to warm 1mL (1mL = 1g) of water by 1°C is 4.184 J/g×°C.
Q = mcΔT relates energy to mass, SHC, and change in temperature.
The mass of water is 300g, and will not change because no water will evaporate until it reaches 100°C.
The change in temperature is 75°C:
100°C - 25°C = 75°C
(Desired temp. - initial temp. = change in temp.)
Subbing these values into Q=mcΔT:
Q = 300g × 4.184J/g×°C × 75°C
Q = 94140J
Scientific notation tells us that we have two significant figures, so:
Q = 9.4 × 10⁴J
Please solve this a,b,c,d
Answer:
The answer should br C
Explanation:
Convert the following word equations into chemical equations using the correct
chemical formulae and physical states.
Reactions involving ionic compounds
1. Aluminium sulfate solution + lithium hydroxide solution → aluminium hydroxide
solid + lithium sulfate solution
2.Ammonium carbonate solution+ magnesium chloride solution→ammonium chloride solution + magnesium carbonate solid
Please reply ASAP, thanks!:)
Answer:
Below.
Explanation:
1. Al2(SO4)^3 (aq) + 6LiOH aql) ----> 3Li2SO4 (aq) + 2Al(OH)^3 (s)
2. (NH4)2CO3 (aq) + MgCl2 (aq) ----> 2(NH4)Cl (aq) + MgCO3 (s).
Chemical equations are represented using correct formulas and physical states, with the aluminum sulfate and lithium hydroxide reaction yielding aluminum hydroxide and lithium sulfate, and the ammonium carbonate and magnesium chloride reaction producing ammonium chloride and magnesium carbonate.
Explanation:To convert word equations into chemical equations, it is essential to use correct chemical formulas and include the physical states of the compounds. Here are the given reactions converted into chemical equations:
Aluminium sulfate solution reacts with lithium hydroxide solution to form an aluminium hydroxide solid and a lithium sulfate solution: 3LiOH(aq) + Al2(SO4)3(aq) → 2Al(OH)3(s) + 3Li2SO4(aq)Ammonium carbonate solution reacts with magnesium chloride solution to form an ammonium chloride solution and a magnesium carbonate solid: (NH4)2CO3(aq) + MgCl2(aq) → 2NH4Cl(aq) + MgCO3(s)Ensuring the reaction equations are balanced is crucial for accurately representing the conservation of mass in chemical reactions.
why do we consider diamonds a kind of metamorphic rock?
Final answer:
Diamonds are considered a metamorphic rock because they are formed through intense heat and pressure deep within the Earth's mantle, which transforms carbon into a crystalline structure. Unlike other metamorphic rocks that show foliation, diamonds are non-foliated as they consist of a single mineral.
Explanation:
We consider diamonds a kind of metamorphic rock because they are formed deep within Earth's mantle through a process of intense heat and pressure. This process transforms the carbon atoms into a crystal structure known as a diamond. Metamorphism involves the recrystallization of minerals and can lead to the formation of new minerals, the reorientation of minerals due to pressure, and sometimes the migration of ions within crystal structures due to heat. While most metamorphic rocks are found in mountain belts or ancient mountain belts due to the conditions conducive to metamorphism, diamonds are actually formed at much greater depths and require unique conditions including temperatures around 900 to 1,300 degrees Celsius, and pressures over 45 kilobars.
The formation of metamorphic rocks, including diamonds, is a facet of the rock cycle, and these transformations allow rocks to become stable under new environmental conditions. Unlike most metamorphic rocks that exhibit foliation due to the reorientation of minerals, diamonds do not show foliation as they are a single mineral rock, thus they are considered non-foliated. They are created from a single element, carbon, and although they have a different formation process compared to foliated metamorphic rocks, the principles of temperature and pressure still apply in their creation.
the graph system represents the rate in which two trucks are being filled where X represent the time in minutes and Y represents the percentage filled
Answer:
Ok so I seen your comment because I was looking up the answer and couldn’t find it anywhere so I risked to see if I got it wrong and got it right the answer is b on Plato and sorry I don’t know what it said but I do know I clicked on b hope this helps
Explanation:
Answer:
B.
The solution is nonviable because the time cannot be negative.
Explanation:
If it's wrong tell me
How many moles of oxygen are needed to react with 23.8 moles of aluminum?
Answer:
17.85moles
Explanation:
Check attachment
Which of the following could a magnet float over?
A. A network solid
B. A molecular solid
C. A semiconductor
D. A superconductor
As the ions present on a magnet and a superconductor are oppositely charged, it would help a superconductor to float over a magnet.
What are ions?An ion is defined as an atom or a molecule which has a net electrical charge. There are 2 types of ions :1) cation 2) anion . The cation is the positively charged ion and anion is the negatively charged ion . As they are oppositely charged they attract each resulting in the formation of ionic bond.
Ions consisting of single atom are mono-atomic ions while which consists of two or more ions are called as poly-atomic ions . They are created by chemical interactions . They are very reactive in their gaseous state and rapidly react with oppositely charged ions resulting in neutral molecules.Ions of opposite charges attract in an ionic bond.
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Consider the reaction of hydrogen gas with chlorine gas:
H2 + Cl2 → 2HCl
4 molecules of hydrogen gas react with 6 molecules of chlorine gas.
4 molecules of hydrogen gas in this reaction will produce 8 molecules of HCl.
6 molecules of chlorine gas in this reaction will produce 12 molecules of HCl.
Hydrogen is the limiting reactant.
All BUT ONE statement about limiting reactants and reactants in excess is true. That is
A) when the limiting reactant runs out, the reaction stops.
B) the limiting reactant produces the least amount of product.
C) the reactant in excess produces the greatest amount of product.
D) when the reaction stops due to the limiting reactant, there will be some of the excess reactant left over.
Answer: C
Explanation: The answer is c because of the H2+CI1--> 2HCI
because the light rays never meet, a concave lens can produce
Answer:
Virtual images.
Hope this helps.
Why is liquid silver less dense than solid silver
Answer:
The same mass divided by a larger volume results in a smaller value for density. Therefore, liquid silver is less dense than solid silver. Temperature and solid density The density of solids usually decreases slightly as temperature increases because solids expand when heated.
Explanation:
Hope this helps
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Liquid silver is less dense than solid silver due to the density between these two species.
Density:It is defined as the ratio of mass over volume. The same mass divided by a larger volume results in a smaller value for density. Therefore, liquid silver is less dense than solid silver. The density of solids usually decreases slightly as temperature increases because solids expand when heated. The vibrations of the molecules increases, and it is easier for the molecules to slide past each other.
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How do water molecules dissolve a salt?
O
A. The water molecules move around the salt crystals.
O
B. The water molecules separate the crystals into molecules.
O
C. The water molecules move around the salt ions.
D. The salt crystals squeeze in between water molecules.
The correct answer is B) The water molecules separate the crystals into molecules.
What's a molecule?The smallest particle of a substance that has all of the physical and chemical properties of that substance. Molecules are made up of one or greater atoms.
What are the kinds of molecules?Diatomic Molecules -- A diatomic atom consists of the most effective atoms, of equal or distinctive chemical factors. Heteronuclear Diatomic Molecules -- A heteronuclear diatomic molecule consists of atoms of equal detail mixed. OXYGEN MOLECULE.CARBON MONOXIDE MOLECULE (CO)How does water dissolve salt?
Water dissolves in salt because the terrible part of a water molecule, the oxygen part is interested in the wonderful sodium ion of the salt. also, the effective part of the water molecule, the hydrogen component is drawn to the terrible chloride ion of the salt. Water molecules pull the sodium and chloride ions aside, breaking the ionic bond that held them together. After the salt compounds are pulled apart, the sodium and chloride atoms are surrounded via water molecules. once this occurs, the salt is dissolved, ensuing in a homogeneous solution.
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Answer:
it’s C
Explanation:
If an atom has three protons three neutrons and two electrons what is the electrical charge of the atom
Answer:
+1
Explanation:
From the question, the following were obtained:
Proton = 3
Neutron = 3
Electron = 2
From the above, we see clearly that the atom has loss 1 electron as the electron is lesser than the proton with 1. So, the atom has a charge of +1
The electrical charge of an atom is determined by subtracting the number of electrons from the number of protons. In this atom with three protons and two electrons, the overall charge is +1.
Explanation:When considering the electrical charge of an atom, the important components to consider are the protons, which have a positive charge, and the electrons, which have a negative charge. Neutrons do not have a charge, so they do not contribute to the overall charge of the atom. In this case, the atom has three protonsand two electrons. Each proton has a charge of +1, and each electron has a charge of -1. Therefore, the overall charge of this atom is calculated by subtracting the number of electrons from the number of protons: 3 (protons) - 2 (electrons) = +1. So this atom has an overall charge of +1.
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How do you do a stoichiometric problem
Write the balanced chemical equation.
Convert the units of the given substance (A) to moles.
Use the mole ratio to calculate the moles of wanted substance (B).
Convert moles of the wanted substance to the desired units.
How many electrons can copper lend?
Final answer:
Copper can lend one or two electrons per atom in chemical reactions, commonly two for the reduction of Cu²⁺ ions, and has free conduction electrons that make it an excellent electrical conductor.
Explanation:
Copper can lend different numbers of electrons depending on the chemical process involved. For instance, in a redox reaction where copper ions are being reduced, two electrons are typically required to reduce a single Cu²⁺ ion to metallic copper (Cu). Since the atomic structure of copper allows for an outermost electron to be loosely bound, copper can conduct electricity well due to the movement of these conduction electrons.
In a typical copper wire or sheet, there is one free electron per atom that can be transferred. However, the number of electrons a copper atom can lend is not unlimited; it is restricted by the reaction conditions and the valence of the copper involved in the reaction.
Low air pressure can cause
Question 5 options:
clouds and precipitation to form
the temperature to drop
a sunny day
fog
Answer: clouds and precipitation to form
Explanation: In a low pressure system warm air rises into the atmosphere and cools down and forms cloud. In low air pressure the humidity is high since there is enough space for water vapor to occupy causing precipitation.
14. Classify Identify each molecule below as
either a polar molecule or a nonpolar molecule. Explain your reasoning.
Oxygen
Carbon dioxide
Answer:
Oxygen - non polar
Carbon Dioxide - non polar
Explanation:
Oxygen is non polar because it is a covalent bond with equal electronegativity.
Carbon dioxide is also non polar because it has 2 Oxygen atoms which are as I stated above they are equally electronegative.
Oxygen is a nonpolar molecule as it consists of two identical atoms sharing electrons equally. Carbon dioxide is also nonpolar because, despite having polar covalent bonds, its linear shape causes the partial charges to cancel each other out.
The question asks whether each given molecule, oxygen, and carbon dioxide is polar or nonpolar and to explain the reasoning behind the classification. The polarity of a molecule is determined by both the electronegativity of the atoms and the overall molecular geometry. Oxygen (O2) is a homonuclear diatomic molecule, meaning it consists of two identical atoms that share the electrons equally, and as a result, it is a nonpolar molecule.
Carbon dioxide (CO2), on the other hand, is a linear molecule with two polar covalent bonds between carbon and oxygen. However, due to the symmetry of its linear shape, the partial charges on the molecule cancel each other out, making it a nonpolar molecule.
The gas carbon dioxide is a pure substance. Which of the following is true about carbon dioxide ?
Carbon and oxygen are chemically bonded in it.
Carbon and oxygen retain their original identity in it
It can be separated into carbon and oxygen using physical methods
The proportion of carbon and oxygen is different in different samples of the gas
Answer:
Carbon and oxygen are chemically bonded in it.
Explanation:
The other answer choices do not apply for compounds, but rather for mixtures instead.
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No matter where it was collected, carbon dioxide has a constant composition, making it a pure substance. One carbon atom and two oxygen atoms are always present in each carbon dioxide molecule. Thus, option A is correct.
What is pure carbon dioxide gas?Two oxygen atoms are covalently bound to one carbon atom to form the chemical molecule known as carbon dioxide (CO2). It exists as a gas in the Earth's atmosphere at standard pressure and temperature.
The production and burning of fossil fuels like coal, oil, and natural gas as well as during wildfires and other natural processes like volcanic eruptions.
Inhaling CO2 is thought to be only mildly harmful. The fundamental health impacts of CO2 are a result of its simple asphyxia nature.
A gas that decreases or replaces the natural oxygen in breathing air is referred to as a simple asphyxia. Mild CO2 exposure symptoms can include headache and sleepiness.
Therefore, Carbon and oxygen are chemically bonded in it.
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Which of the following is true for a cell that has a nucleus?
A. It will not have nuclear membrane. B. It will not have a nucleolus. C. It will not have ribosomes. D. It will not have a nucleoid.
Answer:
D. It will not have a nucleoid.
Explanation:
Cells with a nucleus are eukaryotic cells. This means they will have membrane-bound organelles. The nucleus is an example of a membrane bound organelle that houses the DNA.
A. It will not have nuclear membrane. - this is false, the nucleus is surrounded by the nuclear membrane
B. It will not have a nucleolus - this is false, the nucleolus is a part of the nucleus, usually where ribosomal RNAs are made
C. It will not have ribosomes - this is false, proteins are made in ribosomes and they are present in all cells
D. It will not have a nucleoid - this is true. The nucleoid is a space in the cytoplasm of prokaryotic cells that houses the DNA. It is not membrane bound, and is distinct from the nucleus.
Answer:
top answer is right for sur!
HAVE A GOOD DAY!!
Explanation:
Consider the following intermediate chemical equations.
What is the enthalpy of the overall chemical reaction?
-205.7 kJ
-113.4 kJ
-14.3 kJ
78.0 kJ
Answer:
The first choice, [tex]-205.7\; \rm kJ[/tex].
Explanation:
Let the three reactions, where the enthalpy change were known, be called (1), (2), and (3).
The goal is to find the enthalpy change of the fourth equation. Assume that this equation can be written as [tex]x \times (1) + y \times (2) + z \times (3)[/tex] for some [tex]x[/tex], [tex]y[/tex], and [tex]z[/tex] (might not be whole numbers or take positive values.) Then, by Hess's Law, the enthalpy change of that reaction would be [tex]x \cdot \Delta H_1 + y \cdot \Delta H_2 + z \cdot \Delta H_3[/tex].
To find these [tex]x[/tex], [tex]y[/tex], and [tex]z[/tex], consider: what combination of reaction (1), (2), and (3) would give the fourth reaction?
Imagine that the coefficients are positive for all the reactants, and negative for all the products.
For example: in (1), [tex]\rm H_2\; (g)[/tex] has a coefficient of [tex]2[/tex]. However, since it is on the the product side of (1), its value should be [tex]-2[/tex]. Also, in (3)
Since there is no [tex]\rm H_2\; (g)[/tex] in the desired equation, the value of [tex]x[/tex], [tex]y[/tex], and [tex]z[/tex] should ensure that [tex]-2x + z = 0[/tex].
Another example: [tex]\rm CH_4\; (g)[/tex] is on the reactant side of the first reaction. Its coefficient in the equation is [tex]1[/tex], so that corresponds to [tex]+1[/tex]. Since [tex]\rm CH_4[/tex] is neither in (2) nor in (3), the value of
In the desired equation, [tex]\rm CH_4\; (g)[/tex] is on the reactant side with a coefficient of [tex]1[/tex]. As a result, the value of [tex]x[/tex], [tex]y[/tex], and [tex]z[/tex] should ensure that [tex]x = 1[/tex].
One such equation can be found for each species in the reactions.
[tex]\displaystyle \begin{cases}x = 1 & \left(\text{For $\mathrm{CH_4\; (g)}$}\right) \\ -x - y= 0 & \left(\text{For $\mathrm{C\; (s)}$}\right) \\ -2\, x + z = 0 & \left(\text{For $\mathrm{H_2\; (g)}$}\right) \\ y = -1 & \left(\text{For $\mathrm{CCl_4\; (g)}$}\right) \\ -2\, y + z= 4 & \left(\text{For $\mathrm{Cl_2\; (g)}$}\right) \\ -2\, z = -4 & \left(\text{For $\mathrm{HCl\; (g)}$}\right)\end{cases}[/tex].
Solve this system of equations for [tex]x[/tex], [tex]y[/tex], and [tex]z[/tex] (this approach works only if at least one solution exists.) In this case,
[tex]\displaystyle \begin{cases}x = 1 \\ y = -1 \\ z = 2\end{cases}[/tex].
Calculate the enthalpy change of the desired reaction:
[tex]\begin{aligned}\Delta H &= x\times \Delta H_1 + y \times \Delta H_2 + z \times \Delta H_3 \\ &= 1 \times 74.6 + (-1) \times 95.7 + 2 \times (-92.3) \\ &= -205.7\; \rm kJ\end{aligned}[/tex].
19. Which of the following best describes the role of the spark from the spark plug in an automobile engine?
(A) The spark decreases the energy of activation for the slow step.
(B) The spark increases the concentration of the volatile reactant.
(C) The spark supplies some of the energy of activation for the combustion reaction.
(D) The spark provides a more favorable activated complex for the combustion reaction.
(E) The spark provides the heat of vaporization for the volatile hydrocarbon.
The role of a spark plug is to supply some of the energy of activation for the combustion reaction.
Explanation:
A Spark plug is a tiny bolt of lightning in which a spark of electricity is emitted across a gap creating the ignition of the combustion chamber thereby starting the engine. By putting an engine piston in motion we can power up which produces a smooth burn of the compressed air-fuel mixture.An electrical device that fits into the cylinder head and ignites compressed aerosol gasoline by an electric spark. They have an insulated electrode connected to a coil that ignites thereby producing sparks.The spark plug works as a heat exchanger. They tend to pull unwanted thermal energy from the combustion chamber and heat is transferred to the engine's cooling system. Thus they supply some of the energy for the activation of engines.The correct answer is (C) The spark supplies some of the energy of activation for the combustion reaction, is best describes the role of the spark from the spark plug in an automobile engine.
In an automobile engine, the spark from the spark plug plays a crucial role in initiating the combustion process. The combustion reaction involves the rapid oxidation of a fuel, typically a volatile hydrocarbon, which releases a significant amount of energy. However, this reaction requires an initial input of energy to overcome the energy barrier known as the activation energy.
The spark from the spark plug provides this necessary energy of activation. When the spark plug ignites, it creates a small, high-energy spark that is hot enough to initiate the combustion of the air-fuel mixture in the engine's cylinder. This spark raises the temperature of a small portion of the fuel-air mixture to a point where the molecules have enough kinetic energy to react with each other, thus starting the combustion reaction.
Once the reaction starts, it releases enough energy to sustain itself and continue the combustion process without additional input from the spark plug. The energy released by the combustion reaction is what powers the engine by pushing the pistons down, which in turn rotates the crankshaft and ultimately drives the vehicle's wheels.
To summarize, the spark from the spark plug is essential because it:
- Provides the energy of activation needed to initiate the combustion reaction.
- Does not decrease the energy of activation (option A).
- Does not significantly increase the concentration of the volatile reactant (option B).
- Does not alter the activated complex (option D), as the activated complex is a theoretical state in the reaction pathway, not something that can be provided or altered by external means.
- Does not provide the heat of vaporization (option E) for the hydrocarbon, as the spark's role is to initiate combustion, not to vaporize the fuel, although vaporization of the fuel is a necessary step before combustion.
Therefore, the spark's role is to supply some of the energy of activation for the combustion reaction, making option (C) the correct description.
What are the four main reservoirs of carbon
the atmosphere,the terrestrial biosphere, the oceans and the sediments
.92 moles of carbon dioxide, CO2, was produced when you burned C6H120. (glucose) with O2.
How many grams of water was also produced?
CGH 120(s) + 6 O2(g) – 6 CO2 (g) + 6 H20 (8)
O moles to moles
moles to mass
mass to moles
mass to mass
Answer:
16.56g.
Explanation:
You need to compare the number of coefficient of the reaction product to find how much water produced. The reaction formula will produce 6 carbon dioxide(CO2) and 6 water (H2O).
If the reaction produces 0.92 moles of carbon dioxide, then the amount of water produced in moles will be: 0.92 moles * (6/6)= 0.92 moles
The molar mass of water is 18g/mol, so the calculation of moles to mass will be: 0.92 moles * (18g/mol)= 16.56g.
0.500 g of a sample which contains copper is analyzed iodometrically. Copper (II) is reduced to copper (I) by the iodide. What is the percent copper in the sample if 20.00 cm3 of 0.1 M sodium thiosulphate solution is required for the titration of the liberated iodine?
Answer:
%Copper = 25.42 %
Explanation:
For solving this problem one first write down the half reactions as;
Reduction of Cu²⁺ to Cu⁺¹ by I⁻:
2 Cu²⁺ + 4 I⁻ → 2 CuI + I₂
Secondly, the titration reaction between Na₂S₂O₃ with I₂ as;
2 S₂O₃²⁻ + I₂ → S₄O₆²⁻ + 2 I⁻
Now, Calculate Moles of S₂O₃²⁻ as;
Moles = Molarity × Volume
Putting values,
Moles = 0.1 mol/L × 0.02 L
Moles = 0.002 moles of S₂O₃²⁻
From first two equations we can conclude that,
2 moles of S₂O₃²⁻ liberated I₂ produced by = 2 moles of Cu²⁺
So,
0.002 moles of S₂O₃²⁻ will liberate I₂ produced by = X moles of Cu₂⁺
Solving for X,
X = 0.002 mol × 2 mol / 2 mol
X = 0.002 mol of Cu²⁺
So, we require 0.002 moles of Cu²⁺ to produce I₂ enough for titrating with 0.1 M (20.00 mL) sodium thiosulphate solution.
Now, Calculate mass of Copper as,
Mass = Moles × A.Mass
Mass = 0.002 mol × 63.55 g/mol
Mass = 0.1271 g of Copper
Lastly, calculate % copper as,
%Copper = 0.1271 g / 0.500 g × 100
%Copper = 25.42 %
Final answer:
To calculate the percent copper in a sample using iodometric titration, the amount of sodium thiosulphate used in the titration reveals the moles of copper present. The mass of copper is then calculated, allowing us to find that the sample is 25.42% copper.
Explanation:
To determine the percent copper in the sample using iodometric titration, we first need to understand the chemistry involved. The reaction between Copper (II) and iodide produces iodine, which is then titrated with sodium thiosulphate. The formula for calculating the percent copper is based on the stoichiometry of these reactions.
Given that 20.00 [tex]cm^3[/tex] of 0.1 M sodium thiosulphate is required, we can calculate the moles of sodium thiosulphate reacted: Moles of sodium thiosulphate = 20.00 [tex]cm^3[/tex] × 0.1 mol/L = 0.0020 mol.
Sodium thiosulphate reacts with iodine in a 1:1 molar ratio, meaning 0.0020 mol of iodine was produced. The stoichiometry between copper (II) and iodine is also 1:1, so 0.0020 mol of Copper (II) was initially present. The molar mass of Copper (II) is 63.546 g/mol, hence the mass of copper in the sample is 0.0020 mol × 63.546 g/mol = 0.1271 g.
To find the percent copper, we then use the formula: Percent Copper = (Mass of Copper in the Sample / Total Mass of the Sample) × 100 = (0.1271 g / 0.500 g) × 100 = 25.42%.
Fe + _ H2SO4 _ Fe2(SO4)3 + _ H2
How do I do balancing equations
Answer:
1 Count the atoms of each element in the reactants and the products. 2 use coefficient place them in front of the compound as needed.
3. Which plane’s velocity was greatest?
Answer:
North American X-15
Explanation:
This is the fastest manned aircraft
Answer: SR-71 Blackbird
Explanation: The fastest manned plane is the SR-71 Blackbird. It has traveled at 936 m/s. That is about three times the speed of sound, Mach 3. The SR-71 Blackbird set records both speed and altitude. (brainliest answer pls <3)