Sunlight shining through a clear window it’s Jeremy’s face while he does his homework he uses a large wooden wooden block to cover the window what do the wooden block in the clear window demonstrate
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iron is obtained commercially by the reaction of hematite (Fe2O3) with carbon monoxide. The byproduct of this reaction is carbon dioxide.
what is the efficiency of this process, given as a percent yield, if 671.5g of iron is refined for every 1.0kg of hematite and 0.6g of carbon monoxide.
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The efficiency of this process is greater than 100%
The balanced chemical equation for the reaction between hematite and carbon monoxide is:
Fe₂O₃ + 3 CO → 2 Fe + 3 CO₂
From the equation, we can see that for every mole of hematite, we need 3 moles of carbon monoxide to obtain 2 moles of iron. This means that the theoretical yield of iron is:
2 mol Fe / 3 mol CO = 111.69 g Fe / g CO
To calculate the theoretical yield of iron from 0.6 g of carbon monoxide, we can use the following calculation:
0.6 g CO × (111.69 g Fe / g CO) = 67.014 g Fe
However, we are given that 671.5 g of iron is obtained for every 1.0 kg (1000 g) of hematite. This means that the actual yield of iron is:
Actual yield of Fe = 671.5 g Fe / 1000 g Hematite × 1000 g Hematite = 671.5 g Fe
To calculate the percent yield, we can use the following formula:
Percent yield = (Actual yield / Theoretical yield) × 100%
Percent yield = (671.5 g Fe / 67.014 g Fe) × 100% ≈ 1001.9%
This result is greater than 100%, which is not possible for a chemical reaction.
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how many ounces of a 35 % solution of sulfuric acid (and distilled water)must be mixed with 20 oz of a 20 % solution to get a 30 % solution of sulfuric acid?
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To get a 30% solution of sulfuric acid, 4 oz of a 35% solution of sulfuric acid (and distilled water) must be mixed with 20 oz of a 20% solution of sulfuric acid.
A solution is a homogeneous mixture of two or more substances. For instance, two or more gases, or a gas and a solid, or a liquid and a solid, or two or more liquids could be mixed to create a solution.
First, determine the volume of sulfuric acid in each solution, then combine them to obtain the total amount of sulfuric acid. Solve the equation based on the sulfuric acid content in the final solution.
The volume of sulfuric acid in 35% solution is:
35% = 35/100
= 0.35
V1 = volume of 35% solution of sulfuric acid and distilled water
V1 = 0.35 x V1
Suppose V2 is the volume of 20% solution of sulfuric acid, then
20% = 20/100
= 0.2
V2 = volume of 20% solution of sulfuric acid
V2 = 0.2 x 20 oz
= 4 oz
Let's combine the two solutions.
Total volume is (V1 + V2) ounces,
and the amount of sulfuric acid is 0.35V1 + 0.2V2 ounces.
The volume of sulfuric acid in the final mixture is:
30% = 30/100
= 0.3
V1 + V2 = total volume
0.35V1 + 0.2V2 = total sulfuric acid volume
(0.3 x (V1 + V2)) = 0.35V1 + 0.2V2
V1 + V2 = 40
V1 = 4 oz
Substitute the value of V1 in the equation
V1 + V2 = 40(4 oz) + V2
= 40 V2
= 36 oz
To solve this problem, we can use the concept of the concentration of a solution, which is given by the amount of solute (in this case sulfuric acid) divided by the total amount of solution (sulfuric acid and water) multiplied by 100.
Or
Let x be the number of ounces of the 35% solution of sulfuric acid needed to make a 30% solution. We know that we have 20 ounces of a 20% solution. We can set up an equation based on the concentration of the sulfuric acid in the two solutions:
(0.35x + 0.20(20)) / (x + 20) = 0.30
Simplifying this equation, we get:
0.35x + 4 = 0.30x + 6
0.05x = 2
x = 40
Therefore, we need 40 ounces of the 35% solution of sulfuric acid to mix with the 20 ounces of the 20% solution to obtain a 30% solution.
4 oz of a 35% solution of sulfuric acid (and distilled water) must be mixed with 20 oz of a 20% solution of sulfuric acid to get a 30 % solution of sulfuric acid.Learn more about sulfuric acid: https://brainly.com/question/10220770
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how does the involvement of energy in a decomposition reaction compare to how energy is involved in a combustion reaction?
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Combustion reactions are the combination of some compound with oxygen to make oxides of the other elements as products (although nitrogen atoms react to make N2).
In order for a decomposition reaction to proceed, it must not need an energy source. Exothermic reactions take place in combustion processes between reactants, which are often a fuel and an oxidant. Hydrocarbons are often used in combustion reactions.
What is combustion ?A fuel and an oxidant, typically atmospheric oxygen, engage in a high-temperature exothermic redox chemical reaction known as combustion, or burning, which results in the production of oxidized, frequently gaseous products in a mixture known as smoke.
The addition of energy starts the decomposition reactions. In a breakdown reaction, some chemical bonds in a complex are broken, resulting in the formation of simpler compounds. Chemical bonds must be broken with the input of energy, typically in the form of heat.
Multiple products are created from a single reactant in a decomposition process. When a chemical and oxygen are combined, the result is a combustion reaction that produces oxides of other elements as a byproduct.
Thus, Exothermic reactions take place in combustion processes between reactants, which are often a fuel and an oxidant.
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e) if the ph of the solution in the above problem is adjusted to 3.86 by the addition of concentrated naoh, what will be the concentration of lactate and lactic acid at equilibrium?
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If the pH of the solution is adjusted to 3.86 by the addition of concentrated NaOH, the lactate and lactic acid will be at equilibrium.
At this pH, lactate will be predominantly in its ionized form (lactate ion), while lactic acid will be predominantly in its unionized form. The concentration of lactate and lactic acid can be calculated using the Henderson-Hasselbalch equation: pH = pKa + log([lactate]/[lactic acid]).
Rearranging the equation: [lactate]/[lactic acid] = 10^(pH - pKa), At pH 3.86, the pKa of lactic acid is 3.86, so [lactate]/[lactic acid] = 10^(3.86 - 3.86) = 1
This means that the concentration of lactate and lactic acid will be equal at equilibrium. The actual concentration will depend on the initial concentration of the solution and the amount of concentrated NaOH added to adjust the pH.
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To determine the concentration of lactate and lactic acid at equilibrium when the pH of the solution is adjusted to 3.86 by the addition of concentrated NaOH, follow these steps:
1. Identify the given information: The pH of the solution is adjusted to 3.86.
2. Recall the relationship between pH and pKa: pH = pKa + log([A-]/[HA]), where [A-] is the concentration of lactate (the conjugate base), and [HA] is the concentration of lactic acid (the weak acid). The pKa of lactic acid is approximately 3.86 as well.
3. Since pH = pKa, the equation becomes: 3.86 = 3.86 + log([lactate]/[lactic acid])
4. Subtract 3.86 from both sides: 0 = log([lactate]/[lactic acid])
5. Use the inverse log (or antilog) to solve for the ratio: 1 = [lactate]/[lactic acid]
6. This result indicates that the concentrations of lactate and lactic acid are equal at equilibrium when the pH is adjusted to 3.86.
In conclusion, when the pH of the solution in the above problem is adjusted to 3.86 by the addition of concentrated NaOH, the concentration of lactate and lactic acid will be equal at equilibrium.
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let's push a little bit. you perform an sn1 reaction on a tertiary alcohol using 1 equivalent of hydrochloric acid. if you performed the same reaction using 10 equivalents of hydrochloric acid, what would you expect to be the result? group of answer choices the rate of the reaction would decrease. the rate of the reaction would increase. the rate of reaction would be unaffected. the extra acid would react with itself.
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The rate of the reaction would be affected, and it would increase significantly when using excess hydrochloric acid.
Performing an SN1 reaction on a tertiary alcohol using 1 equivalent of hydrochloric acid is expected to result in a relatively slow reaction due to the stability of the carbocation intermediate.
However, if the same reaction is performed using 10 equivalents of hydrochloric acid, the rate of the reaction would increase significantly. This is because the excess acid would act as a catalyst and facilitate the formation of the carbocation intermediate,
thereby increasing the rate of the reaction. The excess acid would not react with itself, as it is not a reactive species in this context. However, it is important to note that using too much acid could lead to undesired side reactions and affect the overall yield of the reaction.
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Question is located on the picture below
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Across a period, elements gain a proton and valence electron.
How many absorption bands are expected to be observed in the UV-Vis. spectrum of the tetrahedral complex VC14 ? * (1 Point) 3 2 1 4 0
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Zero absorption bands are expected to be observed in the UV-Vis spectrum of the tetrahedral complex VC14.
In a tetrahedral complex like VC14, the symmetry of the molecule leads to the cancellation of any transitions that would result in absorption bands in the UV-Vis spectrum. This is because the electronic transitions that give rise to absorption bands require a change in the electronic symmetry of the molecule. In tetrahedral complexes, the symmetry of the ligand field does not allow for such transitions, resulting in no absorption bands in the UV-Vis spectrum. Therefore, the molar absorptivity of VC14 in the UV-Vis range is expected to be zero, indicating no observable absorption bands.
Absorption, in the context of spectroscopy, refers to the process by which a substance absorbs electromagnetic radiation, such as light, at specific wavelengths. When light passes through a sample, certain wavelengths of light are absorbed by the sample's molecules, while others are transmitted or scattered. The absorbed energy causes transitions in the electrons of the molecules, resulting in the excitation of electrons to higher energy levels.
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Which term correctly balances the nuclear equation below?
223
87 Fr →
0 0
О
-1e
0
1e
oү
4
2 He
+
223
88 Ra
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Answer:
to remember when balancing nuclear equations: 1. The total of the superscripts (mass numbers, ) in the reactants and products must be the same. 2. The total of the subscripts (atomic numbers, ) in the reactants and products must be the same P a r t A What is the value of in the following nuclear reaction?
When you balance an equation you can only change the coefficients (the numbers in front of molecules or atoms). Coefficients are the numbers in front of the molecule. Subscripts are the smaller numbers found after atoms. These cannot be changed when balancing chemical equations! Subscripts are the smaller numbers found after atoms.
Balanced chemical equations have the same number and type of each atom on both sides of the equation. The coefficients in a balanced equation must be the simplest whole number ratio. Mass is always conserved in chemical reactions.
Keeping this in view, what is meant by a balanced equation? A balanced equation is an equation for a chemical reaction in which the number of atoms for each element in the reaction and the total charge is the same for both the reactants and the products. Also Known As: Balancing the equation, balancing the reaction, conservation of charge and mass.
Explanation:
Draw two isomers of this, and name each one: C4H6
Answers
Two isomers are Butadiene Bicyclobutane.
What is isomers?Isomers are substances that contain precisely the same number of atoms, i.e., they have the exact same empirical formula, but they differ from one another by the arrangement of the atoms. Ethylbenzene, m-xylene, p-xylene, and o-xylene are a few isomers with the formula C8H10.The term "isomer" refers to molecules or polyatomic ions that have different configurations of atoms in space but the same number of atoms in their molecular formulas, or the number of atoms in each element. Isomerism is the presence or potential for isomers. Isomers may or may not have comparable chemical or physical properties.Isomerism results from the ability of atoms in a molecular formula to be organized in different ways, resulting in compounds with diverse physical and chemical properties. They number two.To learn more about isomers refers to:
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x=2 and y=3
find the value of
3x + y
3x² - 4
solve this please ty
Answers
Answer:
3x+y = 9
3x² - 4 = 8
Explanation:
3x+y
3(2)+3
9
3x2-4
3(2)^2-4
3
Estimate the value of the equilibrium constant at 610 K for each of the following reactions.2NO2(g)⇋N2O4(g)ΔH∘fforN2O4(g)=9.16kJ/molBr2(g)+Cl2(g)⇋2BrCl(g)ΔH∘fforBrCl(g)=14.6kJ/molΔG∘fforBrCl(g)=−1.0kJ/mol
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The estimated equilibrium constant for the reaction Br2(g) + Cl2(g) ⇋ 2BrCl(g) at 610 K is 1.16.
To estimate the equilibrium constant, we can use the equation:
ΔG° = -RTln(K)
where ΔG° is the standard Gibbs free energy change, R is the gas constant, T is the temperature in Kelvin, and K is the equilibrium constant.
For the reaction 2NO2(g) ⇋ N2O4(g), the given ΔH°f for N2O4(g) is 9.16 kJ/mol. Using this value, we can calculate the standard Gibbs free energy change:
ΔG° = ΔH° - TΔS°
where ΔS° is the standard entropy change. We do not have this value, but we can assume it is roughly constant for this type of reaction. Thus, we can estimate ΔG° to be:
ΔG° ≈ ΔH° = 9.16 kJ/mol
At 610 K, we have:
ΔG° = -RTln(K)
-9100 J/mol = -(8.314 J/mol/K)(610 K)ln(K)
ln(K) ≈ 2.37
K ≈ e^2.37 = 10.7
Therefore, the estimated equilibrium constant for the reaction 2NO2(g) ⇋ N2O4(g) at 610 K is 10.7.
For the reaction Br2(g) + Cl2(g) ⇋ 2BrCl(g), we are given the ΔH°f for BrCl(g) as 14.6 kJ/mol and the ΔG°f for BrCl(g) as -1.0 kJ/mol. Using the same assumptions as before, we can estimate ΔG° to be:
ΔG° ≈ ΔH° = 14.6 kJ/mol
At 610 K, we have:
ΔG° = -RTln(K)
-1000 J/mol = -(8.314 J/mol/K)(610 K)ln(K)
ln(K) ≈ 0.15
K ≈ e^0.15 = 1.16
Therefore, the estimated equilibrium constant for the reaction Br2(g) + Cl2(g) ⇋ 2BrCl(g) at 610 K is 1.16.
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Animals in an experiment are to be kept under a strict diet. Each animal should receive 25 grams of protein and 5grams of fat. The laboratory technician is able to purchase two food mixes: Mx A has 10% protein and 6% fat; mix B has 50% protein and 5% fat. How many grams of each mix should be used to obtain the right diet for one animal? One animar's diet should consist of grams of MaA.
Answers
250 grams of Mix A (MxA) should be used to obtain the right diet for one animal.
To determine the number of grams of Mix A (MxA) needed to obtain the right diet for one animal, let's assume that x represents the number of grams of MxA used.
The protein content in MxA is 10%, which means 0.10x grams of protein will be obtained from MxA.
The fat content in MxA is 6%, which means 0.06x grams of fat will be obtained from MxA.
Since the desired diet for one animal should consist of 25 grams of protein and 5 grams of fat, we can set up the following equation based on the protein content:
0.10x = 25
Solving for x:
x = 25 / 0.10
x = 250 grams.
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Which best describes the relationship between the circulatory system and the respiratory system?
The circulatory system is the transport system for the respiratory system.
The respiratory system is the transport system for the circulatory system.
The circulatory system diffuses red blood cells into the respiratory system to pick up oxygen.
The respiratory system transfers hemoglobin to the red blood cells of the circulatory system.
Answers
Answer:
its a
Explanation:
yw
The respiratory and circulatory systems work together to maintain the homeostasis of the human body. The circulatory system is the transport system for the respiratory system. The correct option is A.
What is respiratory system?The network of organs and tissues which help us to breathe is defined as the human respiratory system. The main function of this system is to introduce oxygen into the body and to expel carbon dioxide from the body.
The human circulatory system consisting of arteries, veins and capillaries provide all the essential nutrients, minerals and hormones to the various parts of the body.
The respiratory system does not work alone in transporting oxygen through the body. The oxygen taken in from the respiratory system moves into blood vessels that then circulate oxygen rich blood to tissues and cells.
Thus the correct option is A.
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Classify each of the following substances as a nonelectrolyte, weak electrolyte, or strong electrolyte in water: (a) H2SO3, (b) CH3CH2OH (ethanol), (c) NH3, (d) KClO3, (e) Cu1NO322
Answers
When dissolved in water, electrolytes have a natural positive or negative electrical charge.
What are the classification of electrolyte?Strong electrolytes are electrolytes that completely dissociate or ionize in their aqueous solution. These electrolytes have a high electrical conductivity and ionization extension.
KClO₃, Cu(NO₃)₂.
A weak electrolyte is a solution in which only a small percentage of the dissolved solute is present as ions. A double arrow in the equation depicting the ionization of a weak electrolyte indicates an equilibrium between the reactants and products.H₂SO₄ , NH₃.
A nonelectrolyte is a substance that does not conduct an electric current in aqueous solution or molten form. Many molecular compounds are nonelectrolytes, such as sugar or ethanol. These compounds do not produce ions when dissolved in water.CH₃CH₂OH .
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Can someone please help me with the page on the right please
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Of the following, which can be used to identify an element present in a sample?
Answers
Answer:
idk but i tryed
Explanation:
The simplest way to use the periodic table to identify an element is by looking for the element’s name or elemental symbol. The periodic table can be used to identify an element by looking for the element’s atomic number. The atomic number of an element is the number of protons found within the atoms of that element.
Identify the part of the slow carbon cycle in which the total amount of carbon is most likely decreasing the most explain why this decrease the occurs
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The slow carbon cycle involves processes that take place over geological timescales, including the transfer of carbon between the atmosphere, oceans, rocks, and soils. The total amount of carbon in each of these reservoirs can change over time due to various factors, such as natural and human-induced processes.
One part of the slow carbon cycle in which the total amount of carbon is most likely decreasing the most is the process of sedimentation of organic matter in ocean sediments. This occurs because the organic matter that sinks to the seafloor is buried and undergoes diagenesis, a process by which it is transformed into more stable forms of carbon, such as kerogen or graphite. The decrease in carbon occurs because the rate of sedimentation of organic matter is faster than the rate of carbon input from sources such as volcanoes, weathering of rocks, and human activities.
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Explain how scientists know there are different layers of the earth
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1. silicon is a(n) 2. the smallest piece of silicon still retaining the characteristics of silicon is called a(n) 3. silica is a(n) 4. the smallest piece of silica still retaining the characteristics of silica is called a(n) 5. quartz is a(n) 6. granite is a(n) 7. elements are defined based on the number of 8. in general, an unbalanced atom is called a(n) 9. specifically, an atom that has gained electrons is called a(n)
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The overall charge of an ion is determined by how many electrons it has gained or lost. A negative overall charge results from an atom gaining electrons.
When electrons are obtained, what happens?Atoms that lose an electron change into positive ions, often known as cations. Atoms transform into negative ions, or anions, when they pick up electrons.
How are the acquired electrons located?If the charge is negative, the atomic number is increased by the charge. If it's negative, the ion has picked up electrons. The total number of electrons can be calculated by multiplying the atomic number by the charge. Protons are less numerous than electrons in this instance.
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3. Predict Based on the cooling curve data above, predict a freezing temperature range for a mixture containing 83% lead and 17% tin.
Answers
Based on the cooling curve data above, the predicted freezing temperature range for a mixture containing 83% lead and 17% tin is 250 °C.
What is the freezing temperature of a substance?The freezing temperature of a substance is the temperature at which the molecules of a substance are converted to liquid.
The freezing temperature of a pure substance occurs at a specific temperature.
Based on the cooling curve shown below;
the freezing temperature of pure 100% lead is 300 °C.
the freezing temperature of 67% and 33% tin is 200 °C.
the predicted freezing temperature of pure 87% lead and 17% tin is 250 °C.
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Two substances each have a
temperature of 23 degrees Celsius.
After they are combined the
temperature rises to 27 degrees
Celsius. What evidence proves a
chemical reaction occurred?
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what is the balance of S8+Br2=S3Br7
Answers
Answer:
3S₈ + 28Br₂ => 8S₃Br₇
Explanation:
Start with either sulfur (S) or bromine (Br) and balance ...
3S₈ + Br₂ => 8S₃Br₇ or S₈ + 7/2Br₂ => S₃Br₇
Balance the remaining reactant ...
3S₈ + 56/2Br₂ => 8S₃Br₇
Remove fractions by multiplying by the fraction's denominator
2(3S₈ + 56/2Br₂ => 8S₃Br₇) => 6S₈ + 56Br₂ => 16S₃Br₇
Reduce to smallest whole number ratio => standard equation at STP ...
3S₈ + 28Br₂ => 8S₃Br₇
What is 'Energy to raise 1g of water 1°C'?
Answers
Answer:
4.18 joules of heat energy
What is generally true about the particles in a gas?
A. Gas particles are closer together and have stronger attraction between them than the particles in a solid.
B. Gas particles are closer together and able to conduct electricity better than the particles in a plasma.
C. Gas particles are farther apart and able to conduct electricity better than the particles in a liquid.
D. Gas particles are farther apart and have weaker attraction between them than the particles in a solid.
Answers
Answer:
D
Explanation:
22) Name the neutral element with this orbital diagram.
Answers
Answer:
Sn (Tin)
Explanation:
How are the functions of the mouth and stomach similar to each other
Answers
Answer:
they both break down food
Explanation:
A cube of iron at 20. Degrees C is placed in contact with a cube of copper at 60 degrees C. Which statement describes the initial flow of heat between the cubes?
Answers
Answer:
D) Heat flows from the copper cube to the iron cube.
Explanation:
These are the options for the question
A) Heat does not flow between the cubes.
B) Heat flows in both directions between the cubes
C) Heat flows from the iron cube into the copper cube.
D) Heat flows from the copper cube to the iron cube.
From the knowledge of
second law of Thermodynamicss, which says heat moved from higher temperature to lower temperature region, and termal conduction,energy such as heat will only flow from higher temperature to lower temperature, which means the heat will move from higher concentration to lower Concentration. As the cube of copper at 60 degrees is heated the atoms beginnings to vibrate as it acquire energy then moves and flow to the lower temperature part.
Therefore, Heat flows from the copper cube to the iron cube.
commonly held belief is that you can boil water faster by adding salt (a nonvolatile solute). in light of what we have just learned would you predict this belief to be true? if not, what impact on the rate of boiling water would you predict? prof. josh colligative properties 25 / 30
Answers
The commonly held belief that you can boil water faster by adding salt (a nonvolatile solute) is not true.
According to the concepts of colligative properties, the boiling point of a solution is increased by the addition of a nonvolatile solute. This implies that the boiling point of saltwater should be higher than that of pure water, not lower.
However, salt does have an impact on the rate of boiling water. The addition of salt to water, particularly a small quantity, has no effect on the boiling process or on the temperature at which it occurs. The reason for this is that adding salt to water does not reduce the amount of heat required to boil it, so it boils at the same temperature as pure water
.However, when salt is added to water in greater amounts, the boiling temperature of the water increases. In other words, the more salt that is added to water, the higher the boiling temperature becomes. This is due to the fact that adding a nonvolatile solute raises the boiling point of the solution.
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What type of cell is prokaryotic?
Animal Cell
Plant Cell
Bacterial Cell
Fungi Cell
Answers
Prokaryotic cells contain no membrane-bound organelles, meaning no nucleus as is present in eukaryotic cells (plant, fungi and animal cells) and no mitochondria. Prokaryotic cells contain free-floating DNA, and tend to have a flagellum, which is not present in most eukaryotic cells.
Answer:
C. Bacterial Cell
Explanation:
Prokaryotic cells are cells that do not have a nucleus or other membrane-bound organelles. Bacterial cells are an example of prokaryotic cells. So the correct answer is Bacterial Cell.
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Why are organic compounds predominantly covalent?
Answers
because all organic compounds have in common the presence of carbon atoms and hydrogen atoms.