Answers
Answer:
Alkali metals
Explanation:
Hope you like my answer and my answer helped youRelated Questions
How do specialized brown fat cells take advantage of oxidative phosphorylation to generate heat?.
Answers
Specialized brown fat cells take advantage of oxidative phosphorylation to generate heat as they contain a carrier protein that dissipates the proton gradient across the inner mitochondrial membrane.
oxidative phosphorylation is when in mitochondrion the proton gradient does is the production of ATP from ADP. This depends on the oxidative reaction happening in the mitochondria. During oxidative phosphorylation electrons from NADH and FADH₂ combine with oxygen and then releases the energy from the oxidation or reduction reaction that is used to synthesis of ATP from ADP
Thus, Specialized brown fat cells take advantage of oxidative phosphorylation to generate heat as they contain a carrier protein that dissipates the proton gradient across the inner mitochondrial membrane.
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A piece of wood near a fire is at 23°C. It gains 1,160 joules of heat from the fire and reaches a temperature of 42°C. The specific heat capacity of
wood is 1.716 joules/gram degree Celsius. What is the mass of the piece of wood?
ОА. 16 g
OB. 29 g
ОC. 36 g
OD. 61 g
Answers
Answer:
35.578g or 36g if you round
Explanation:
Q=mc ∆∅ where ∅ is temperature difference
1160= m x 1.716 x (42-23)
m = 1160/ 1.716 x19
m=35.578g
m = 36g to nearest whole number
Answer: C. 36 g
Explanation: I got this right on Edmentum.
4. Long answer type questions: a. b. C. d. e. f. g. h. j. i. What are the constituent gases of air? Why is the surrounding air not seen with the eyes? How do you prove that air supports burning? How do you show that air occupies space? How do you prove that air has weight? How is air useful to us? Mention any three points. Write any three properties of air. How can you say that air exerts force? Write any four effects of air pollution. Write any three causes of air pollution and any two control measures of it.
Answers
1. The constituent gases of air are:
Nitrogen Oxygen Argon Carbon Dioxide2. The surrounding air is not seen with the eyes because it is transparent. Air molecules are not visible to the na-ked eye, and they do not scatter or absorb visible light significantly. Therefore, air appears colorless and transparent.
What is air?3. To prove that air supports burning, you can perform an experiment with a burning candle. Place a glass jar or bell jar over a lit candle, ensuring that the jar is airtight. As the candle burns, it consumes oxygen from the air inside the jar. Eventually, the candle flame will go out due to the lack of oxygen, proving that air (specifically oxygen) is necessary for burning.
4. To show that air occupies space, you can perform a simple experiment using a plastic bottle or syringe. Fill the bottle or syringe with water, ensuring there are no air bubbles. Then, cover the opening tightly and try to compress the air inside. You will find that it is not possible to compress the air significantly, indicating that air occupies space.
5. To prove that air has weight, you can use a sensitive balance or scale. Weigh an airtight container or balloon, and then fill it with air. The weight of the container or balloon with the added air will be greater than its initial weight, demonstrating that air has weight.
6. Air is useful to us in various ways. Three points highlighting the importance of air are:
Breathing and RespirationCombustion and Energy ProductionClimate Regulation7. Three properties of air include:
Air is Compressible: Air can be compressed or expanded under different conditions, allowing it to fill various spaces and containers.Air has Mass: Air molecules have mass, which means air itself has weight. It exerts pressure on objects and surfaces.Air Exerts Pressure: Due to the collisions of air molecules with surfaces, air exerts pressure in all directions. This pressure is known as atmospheric pressure.Air exerts force in various ways. For example, air pressure allows objects like airplanes to fly by providing lift. Air resistance or drag opposes the motion of objects moving through the air, creating a force that can affect their speed and trajectory.
8. Four effects of air pollution include:
Respiratory ProblemsEnvironmental Damage:Climate ChangeHuman Health Impacts9. Causes of pollution:
Industrial EmissionsVehicle EmissionsResidential and Agricultural Activities10. Two control measures for air pollution include:
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The molar masses of four unknown gases are shown in the table.
Molar Mass of
Unknown Gases
Gas Molar Mass
A
44 g/mol
B
20 g/mol
30 g/mol
D
32 g/mol
Which gas is likely to have the highest rate of effusion? (4 points)
Gas A
Gas B
Gas C
Gas
Answers
GAS A, Graham's law states that the rate of effusion of a gas is inversely proportional to the square root of its molar mass or that the rate of effusion of two gases = square root of the inverse of their molar masses.
How can the molar mass of an unidentified gas be determined?PV = nRT, where P is pressure (in atm), V is the volume (in L), n is the number of moles of gas, R is the universal gas constant (0.08206 Latm/molK), and T is temperature, is the formula used to calculate the molar mass (in K).
What is the molar mass of a gas whose density is 0.761 g L at STP?By dividing the mass of one mole of ammonia by the aforementioned volume, the density can now be computed. This density is somewhat lower than the ammonia density at the STP, which is equivalent to (170.4g/mol)(22.4L/mol)=0.761g/L.
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Determine the theoretical and percentage yield of the reaction below, if you started with 10 mL of the alcohol (C9H120; density = 0.900 g/ml.) and 10 ml of 12 Molar HCl to produce 5 mls of the product as a colorless liquid (C9H110; density - 0.800 g/mL)? Please show a step by step calculations for your answer.
Answers
The answer is 39.2%.
Solution:
\(Yield = \frac{Observed yield}{Theoritcal yield}*100\)
= \(\frac{4.0}{10.2} *100\)
= 39.2%.
Theoretical yields are calculated based on the stoichiometry of the chemical formula. Actual yield is determined experimentally. Percent yield is determined by calculating the ratio of actual yield to theoretical yield. how much usable product is obtained after processing; how much crude product is actually ordered.
However, in practice, the actual product yield is almost always lower than the theoretical yield. The actual yield is the amount of product actually obtained and the theoretical yield is the maximum possible yield. There are several reasons why percentage returns may not be 100%. This is because some other unexpected reaction occurred that did not produce the desired product.
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How many grams of mercury (II) phosphite would I need to weigh to make 699.9mL of a 1.233e+00 M solution?
Answers
Answer
655.61 grams of mercury (II) phosphite.
Explanation
Given:
Volume, V = 699.9 mL = 0.6999 L
Molarity = 1.233e+00 M
What to find:
The grams of mercury (II) phosphite needed to make 699.9mL of a 1.233e+00 M solution.
Step-by-step solution:
Step 1: Calculate the number of moles of mercury (II) phosphite in 699.9mL of a 1.233e+00 M solution.
The moles can be known using the molarity formula:
\(\begin{gathered} Molarity=\frac{Moles}{Volume\text{ }in\text{ }L} \\ \\ Moles=Molarity\times Volume\text{ }in\text{ }L \\ \\ Moles=1.233\text{ }M\times0.6999L \\ \\ Moles=0.8629767\text{ }mol \end{gathered}\)Step 2: Convert the moles of mercury (II) phosphite needed to 699.9mL of a 1.233e+00 M solution to mass in grams.
Using the atomic masses of (Hg = 200.59, P = 30.97, O =15.999) from the periodic table.
The molar mass of mercury (II) phosphite (Hg3(PO3)2) = (3 x 200.59) + 2(30.97 + (3 x 15.999)) = 601.77 + 157.934 = 759.704 g/mol
Therefore, the mass of mercury (II) phosphite needed to 699.9mL of a 1.233e+00 M solution to mass in grams is:
\(\begin{gathered} Mass=Moles\times Molar\text{ }mass \\ \\ Mass=0.8629767\text{ }mol\times759.704\text{ }g\text{/}mol \\ \\ Mass=655.61\text{ }grams \end{gathered}\)Thus 655.61 grams of mercury (II) phosphite are needed to 699.9mL of a 1.233e+00 M solution.
Can someone please help me?
Answers
The IUPAC name for each of the compounds would be:
A. 2,6-Dimethyl octane
B. Octane
What is IUPAC naming?IUPAC naming is a system of naming organic compounds according to the rules set up by the International Union of Pure and Applied Chemistry.
According to these rules:
The longest carbon chain, otherwise known as the parent chain is considered.The parent chain is numbered in such a way that the branching chain or chains (substituents) get the lowest number.The location of each substituent is written. If there is more than one substituent, they are written in alphabetical order.Applying these rules to the structures in the image, the IUPAC names would be as follows:
A. 2,6-Dimethyl octane
B. Octane
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How many moles of KBr are dissolved in 60.2 mL of a 3.50 M solution?
Answers
There are 0.2107 moles of KBr are dissolved in 60.2 mL of a 3.50 M solution.
The molarity of a substance is defined as the number of moles of solute present in 1 litre of a solution.
According to the given data, the molarity of the solution tells us that there are 3.50 moles of KBr in 1000mL of solution. But we only have 60.2mL of solution, so with a mathematical rule of three we can calculate the amount of moles in 60.2mL:
1000 ml - 3.50 moles
60.2 ml -x = 60.2 ml× 3.50 moles/1000 ml
x= 60.2 ml -0.2107 moles
So, there are 0.2107 moles of KBr.
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A music performance takes place in an enclosed arena. A person sitting a distance of 20.0 m from the speaker experiences a sound intensity of 0.32 W/m2. What is the power of the speaker? (Assume that the area over which the speaker transmits sound is given by A = 4πd2, where d is the distance from the speaker.)
A.
100 W
B.
550 W
C.
1,200 W
D.
1,600 W
Answers
Describe an
application for the water collecting surface (where could it be used and for
what purpose?)
Answers
Answer:
Rainwater harvesting system, also called rainwater collection system or rainwater catchment system, technology that collects and stores rainwater for human use. Rainwater harvesting systems range from simple rain barrels to more elaborate structures with pumps, tanks, and purification systems. The nonpotable water can be used to irrigate landscaping, flush toilets, wash cars, or launder clothes, and it can even be purified for human consumption. With water scarcity a pressing problem for many densely populated regions, rainwater harvesting systems can supply households and businesses with water for use in dry seasons and lessen the demand on municipal systems.
Explanation:
What is the chemical formula for the ionic compound whose unit cell is shown? (A and B are cations; X is an anion.)
Answers
The chemical formula is AB3X, A occupies all the corners & B occupies the faces, So the contribution = ½ × 6 = 3 . X occupies body center So contribution= 1,So atomic formula= AB3X
What is Chemical formula?
A chemical formula is a way of presenting information about the chemical ratios of atoms that make up a particular chemical compound or molecule, using chemical element symbols, numbers, and sometimes other symbols such as parentheses, dashes, parentheses, commas, and plus and minus signs
What is chemical compound?
A chemical compound is a chemical substance composed of two or more different chemical elements held together by chemical bonds. It can be either a molecular compound composed of atoms held together by covalent bonds, or an ionic compound composed of ions held together by ionic bonds. Compounds can be composed of elements from the same group, or from different groups.
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C3H6O + 4 O2 3 CO2 + 3 H2O reaction type
Answers
The given chemical equation is a combustion reaction.
Explanation:
The given chemical equation is:
C3H6O + 4 O2 → 3 CO2 + 3 H2O
This is a combustion reaction, which involves the burning of a hydrocarbon (in this case, C3H6O) in the presence of oxygen (O2) to produce carbon dioxide (CO2) and water (H2O).
In this reaction, C3H6O is the hydrocarbon (also known as a fuel) and O2 is the oxidant (also known as the oxidizing agent or the oxygen source). During the reaction, the carbon atoms and hydrogen atoms in the fuel combine with oxygen atoms from the oxidant to form carbon dioxide and water, respectively.
The balanced chemical equation shows that for every one molecule of C3H6O, four molecules of O2 are needed to completely react with it. The products of the reaction are three molecules of CO2 and three molecules of H2O.
Overall, this reaction is exothermic, meaning that it releases heat energy as it occurs. Combustion reactions are important in many industrial and household processes, as they are used to generate heat and energy.
An atomic cation with a charge of +1 has the following electron configuration:
1s 2s 2p 3s 3p 3d ¹4s¹
What is the chemical symbol for the ion?
How many electrons does the ion have?
How many 3p electrons are in the ion?
Answers
A) The chemical symbol for the ion is Fe+
B) It has 20 electrons in total, and there are 6 3p electrons in the ion.
C) There are 6 electrons present in the 3p orbital.
The atomic cation with the given electron configuration is represented by the chemical symbol Fe+.
To determine the number of electrons in the ion, we need to count the electrons present in the electron configuration. In the given configuration, we can see that the 1s orbital has 2 electrons, the 2s orbital has 2 electrons, the 2p orbital has 6 electrons, the 3s orbital has 2 electrons, the 3p orbital has 6 electrons, the 3d orbital has 1 electron, and the 4s orbital has 1 electron. Adding up these numbers, we have:
2 + 2 + 6 + 2 + 6 + 1 + 1 = 20
Therefore, the ion has 20 electrons.
To determine the number of 3p electrons in the ion, we look at the 3p orbital. In this case, there are 6 electrons present in the 3p orbital.
In summary, the chemical symbol for the ion is Fe+, it has 20 electrons in total, and there are 6 3p electrons in the ion.
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Iron(III) oxide reacts with carbon monoxide according to the equation Fe2O3(s)+3CO(g)→2Fe(s)+3CO2(g) A reaction mixture initially contains 22.20 g Fe2O3 and 14.60 g CO.
Answers
The complete balanced equation os Fe2O3(s)+3CO(g)→2Fe(s)+3CO2(g)
First, calculate the number of moles of both reactants as follows:
Moles of Fe2O3 = Amount of Fe2O3 / molar mass
Moles of Fe2O3 =22.00 g / 159.69 g/mol = 0.138 mol
Moles of CO = Amount of CO / molar mass
Moles of CO =14.42 g / 28.01 g/mol = 0.515 mol
Now determine the limiting agent as follows:
The limiting reagent is a substance that limits the amount of product in the reaction. This limiting agent is completely consumed in the reaction.
Fe2O3(s)+3CO(g)→2Fe(s)+3CO2(g)
0.138 mol Fe2O3 x 3 mol CO / 1 mol Fe2O3 = 0.414 mol CO
Here Fe2O3 is a limiting agent and CO is present in excess. 0.414 mol CO used thus calculate the remaining mol of CO as follows:
0.515 mol CO - 0.414 mol CO = 0.101 mol CO.
Mass of CO = 0.101 mol CO x 28.01 g/mol = 2.83 g CO
2.83 g CO of the excess reactant is left.
Chemical Reaction Types This reaction has a single substitution reaction. Balance strategy Al and Fe are exchanged in this single exchange reaction. Two moles react with 15 moles of oxygen to produce 14 moles of carbon dioxide gas along with 6 moles of water. The most common type of corrosion is uniform corrosion. Here, a uniform oxide layer appears on the surface of the material.
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what does celery, a wooden spoon, and oil/gasoline have in common?
Answers
Answer:
All of them are organic compounds which have carbon as their main atom in the structure.
Explanation:
Hello.
In this case, since organic chemistry is the study of all the compounds having the carbon atom as their main atom, all the vegetables, animals, an in general, living things are composed by lipids, proteins, and other organic substances with this feature. Moreover, wood-based materials are mainly composed by lignin which is an organic polymer also having carbon as the main atom. In addition, oil and gasoline are organic chemical compounds with a lot of applications in daily life which also contain carbon atoms in their structure.
In such a way, a celery, a wooden spoon, and oil/gasoline have the carbon atom in common as their main atom in their chemical structures.
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Cubic zirconia is a substance produced in a laboratory. It looks nearly identical to a diamond. Why is it not a mineral?
It has no definite chemical formula.
It is not crystalline in structure.
It is not a solid.
It is not naturally occurring.
Answers
Answer:
it is not naturally occuring
Cars are the leading cause of____
1. carbon dioxide
2. nitrogen oxide
3.carbon monoxide
pollution
Answers
Answer:
nitrogen oxide
Explanation:
not 100% sure
Describe an experiment to show that pressure acts in all directions in liquids.
Answers
We frequently observe kids playing with polythene bags filled with water that have little holes drilled into them at various locations so they can sprinkle water on other kids. Through this experiment, we can say that pressure acts in all directions in liquids.
Liquid's pressureSince both liquids and gases may flow, they are both referred to as fluids. Fluids under rest pressure behave uniformly in all directions.
Weather forecasts can be made using barometers. They track the evolution of atmospheric pressure throughout time.
On weather forecast maps, pressure variations appear as an isobar pattern. Predictions are made using these changes in pressure, and they are fairly accurate when combined with wind observations.
Pressure and depth in liquidsAs you go away from a liquid's surface, pressure rises. for instance: A bucket has three holes that are all the same size. Since there is more pressure at the bucket's bottom, the water spills out more forcefully. Dams are thicker at the bottom for this reason.
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In what order would you put these stages of melting candle wax, for the correct answer?
Liquid wax heating
Melting
Boiling
Gaseous wax heating
Solid Wax heating
Answers
Answer:
The correct order for the stages of melting candle wax is:
Solid wax heatingMeltingLiquid wax heatingBoilingGaseous wax heatingExplanation:
A sample of Copper absorbs 43.6 KJ of heat, resulting in a temperature rise of 75.0 oC, determine the mass (in Kg) of the copper sample, if the specific heat capacity of Copper is 0.385 J/g oC
Answers
Explanation:
here is the answer to your question
The SI unit of pressure is the _______.
The boiling point of water is _______ on Mount McKinley than the boiling point of water in NYC.
At lower elevations, atmospheric pressure _______ compared to higher elevations.
Standard atmosphere or standard atmospheric pressure is equal to _______ Pa.
Answers
The SI unit of pressure is the Pascal (Pa).
The boiling point of water is lower on Mount McKinley than the boiling point of water in NYC.
What is Pressure?
Pressure is defined as the amount of force applied perpendicular to the surface of an object per unit area over which that force is distributed. In other words, it is the force per unit area that an object exerts on another object. Pressure can be measured in various units such as pascal (Pa), bar, pounds per square inch (psi), and atmospheres (atm), among others. It is an important concept in physics and is used to describe many phenomena, including fluid dynamics, weather patterns, and even the behavior of gases in space.
At lower elevations, atmospheric pressure is higher compared to higher elevations.
Standard atmosphere or standard atmospheric pressure is equal to 101325 Pa.
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NH3 + H2O -> NH4 + OH (heat) is this an exothermic or endothermic reaction
Answers
Barnacles need a solid structure in the water to attach to and live on, which they can find on a turtle shell. The turtle is unaffected by the presence of the barnacles. That type of relationship bests describes what these two animals have?
Answers
the relationship between turtles and barnacles is an example of
co-evolution, where each species is continually adapting to changes with the other.
Barnacles attaches to turtle's shell due to its hardness. Barnacles needs a hard surface to bind with so that it can thrive. A single barnacle doesn’t harm a turtle. But excessive barnacles can make a turtle inactive,also impact its vision and make it difficult to eat, and sometimes lead to infection.
.The cyprid larvae of barnacle has a special attachment devices which allow it to hold onto the substrate, e.g. cup-shaped attachment organs on the antennae. Once barnacle is settled, the barnacle develops into an adult and attaches in different ways as gripping the skin, cementing to the shell or boring into it.
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A team of workers in a factory is paid $23.25 per pallet of goods produced. If a team of five workers produces 102 pallets in a shift, how much will each person in the team have earned that shift?
Answers
Answer:
$474.30
Explanation:
23.25 × 102 = 2371.5 (total amount of money produced from pallets)
2371.5/5 = 474.3 (payout per worker)
How many pi bonds are in the oxalate ion (C2O42-)?
Answers
Answer:there are 13
Explanation:
There are two types of chemical compound one is covalent compound and another is ionic compound in chemistry. In ionic bonds, electrons are completely transferred. Therefore, there are 2 pi bonds in oxalate ion C\(_2\)O\(_4\)²⁻.
What is chemical Compound?Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.
Covalent compounds are formed by covalent bond and ionic compounds are formed by ionic bond. Covalent bond is formed by sharing of electron and ionic bond are formed by complete transfer of electron. Ionic bonds are stronger than covalent bonds. The melting and boiling points are higher in ionic compounds. There are total 2 pi bonds in oxalate ion C\(_2\)O\(_4\)²⁻.
Therefore, there are 2 pi bonds in oxalate ion C\(_2\)O\(_4\)²⁻.
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How much work (in J ) is involved in a chemical reaction if the volume decreases from 4.40 to 1.39 L against a constant pressure of 0.872 atm?
Answers
The work involved in a chemical reaction is -2.62J
What is work done in a chemical reaction?Work is done in the chemical reaction when gases expand and compress against a constant external pressure.
The work done by a gas is given by the formula;
w = pΔv
p = pressure of the gas
Δv = change in the volume of the gas
When the gas does work the volume of a gas increases (ΔV>0) and the work done is negative.When work is done on the gas, the volume of the gas decreases (ΔV<0) and work is positive.Given,
Pressure = 0.872 atm
Initial volume = 4.40 L
Final volume = 1.39 L
Work done = Pressure ( Final volume - Initial volume)
= 0.872 ( 1.39 - 4.40)
= 0.872 ( - 3.01)
= - 2.62 J
Therefore, the work done in the chemical reaction is - 2.62J
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One reaction that produces acid rain is:3 NO2 + H2O -> NO + 2HNO3When 60 grams of water reacts with NO2, 300 grams of HNO3 is produced, what is the percent yield?
Answers
ANSWER
The percentage yield is 71.5%
EXPLANATION
Given that
The mass of water reacted is 60 grams
The mass of HNO3 produced is 300 grams (Actual yield)
Follow the steps below to find the percentage yield of the reaction
Step 1; Write the balanced equation of the reaction
\(\text{ 3NO}_2\text{ + H}_2O\text{ }\rightarrow\text{ NO + 2HNO}_3\)Step 2; Find the number of moles of water using the below formula
\(\text{ mole = }\frac{\text{ mass}}{\text{ molar mass}}\)Recall, that the molar mass of H2O is 18.0 g/mol
\(\begin{gathered} \text{ mole = }\frac{\text{ 60}}{\text{ 18}} \\ \text{ mole = 3.33 moles} \end{gathered}\)The moles of water is 3.33 moles
Step 3; Find the number of moles of HNO3 using stoichiometry ratio
In the above equation, 1 mole of water reacted to gives 3 moles of HNO3
Let x represents the number of moles of HNO3
\(\begin{gathered} \text{ 1 mole H}_2O\rightarrow\text{ 2 moles HNO}_3 \\ \text{ 3.33 moles H}_2O\text{ }\rightarrow\text{ x moles HNO}_3 \\ \text{ Cross multiply} \\ 1\text{ mole H}_2O\text{ }\times\text{ x moles HNO}_3\text{ = 2 moles HNO}_3\text{ }\times\text{ 3.33 moles H}_2O \\ \text{ Isolate x moles HNO}_3 \\ \text{ x moles HNO}_3\text{ = }\frac{2\text{ moles HNO}_3\times3.33moles\cancel{H_2}O}{1moles\cancel{H_2}O} \\ \\ \text{ x moles HNO}_3\text{ = 2 }\times\text{ 3.33} \\ \text{ x moles HNO}_3\text{ = 6.66 moles} \end{gathered}\)Step 4; Find the mass of HNO3 using the formula below
\(\begin{gathered} \text{ mole = }\frac{\text{ mass}}{\text{ molar mass}} \\ \text{ cross multiply} \\ \text{ mass = mole }\times\text{ molar mass} \end{gathered}\)Recall, that the molar mass of HNO3 is 63.01 grams
\(\begin{gathered} \text{ mass = 6.66 }\times\text{ 63.01} \\ \text{ mass = 419.65 grams} \end{gathered}\)The mass of H2O is 419.65 grams (theoretical yield)
Step 5; Find the percentage yield of the reaction
\(\begin{gathered} \text{ Percentage yield = }\frac{\text{ Actual yield }}{\text{ theoretical yield }}\times\text{ 100\%} \\ \\ \text{ Percentage yield = }\frac{\text{ 300}}{\text{ 419.65}}\times\text{ 100\%} \\ \text{ Percentage yield = 0.715}\times\text{ 100\%} \\ \text{ Percentage yield = 71.5\%} \end{gathered}\)Therefore, the percentage yield is 71.5%
Starting with 0.3500 mol CO(g) and 0.05500 mol COCl2(g) in a 3.050 L flask at 668 K, how many moles of CI2(g) will be present at equilibrium?
CO(g) + Cl2(g)》COCl2(g)
Kc= 1.2 x 10^3 at 668 K
Answers
At equilibrium, the number of moles of \(Cl_2\) (g) will be 0.2025 mol.
1: Write the balanced chemical equation:
\(C_O\)(g) + \(Cl_2\)(g) ⟶ \(C_OCl_2\)(g)
2: Set up an ICE table to track the changes in moles of the substances involved in the reaction.
Initial:
\(C_O\)(g) = 0.3500 mol
\(Cl_2\)(g) = 0.05500 mol
\(C_OCl_2\)(g) = 0 mol
Change:
\(C_O\)(g) = -x
\(Cl_2\)(g) = -x
\(C_OCl_2\)(g) = +x
Equilibrium:
\(C_O\)(g) = 0.3500 - x mol
\(Cl_2\)(g) = 0.05500 - x mol
\(C_OCl_2\)(g) = x mol
3: Write the expression for the equilibrium constant (Kc) using the concentrations of the species involved:
Kc = [\(C_OCl_2\)(g)] / [\(C_O\)(g)] * [\(Cl_2\)(g)]
4: Substitute the given equilibrium constant (Kc) value into the expression:
1.2 x \(10^3\) = x / (0.3500 - x) * (0.05500 - x)
5: Solve the equation for x. Rearrange the equation to obtain a quadratic equation:
1.2 x \(10^3\) * (0.3500 - x) * (0.05500 - x) = x
6: Simplify and solve the quadratic equation. This can be done by multiplying out the terms, rearranging the equation to standard quadratic form, and then using the quadratic formula.
7: After solving the quadratic equation, you will find two possible values for x. However, since the number of moles cannot be negative, we discard the negative solution.
8: The positive value of x represents the number of moles of \(Cl_2\)(g) at equilibrium. Substitute the value of x into the expression for \(Cl_2\)(g):
\(Cl_2\)(g) = 0.05500 - x
9: Calculate the value of \(Cl_2\)(g) at equilibrium:
\(Cl_2\)(g) = 0.05500 - x
\(Cl_2\)(g) = 0.05500 - (positive value of x)
10: Calculate the final value of \(Cl_2\) (g) at equilibrium to get the answer.
Therefore, at equilibrium, the number of moles of \(Cl_2\) (g) will be 0.2025 mol.
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1. What do we achieve by keeping the concentration of sodium hydroxide significantly higher than the crystal violet (CV) concentration
Answers
Answer:
The molar concentration of the crystal violet solution is more concentrated than that of the sodium hydroxide solution. It is because the crystal violet solution has more solute in it compared to the sodium hydroxide.
Reflect on the learning activities titled “Hypothesis”, “Variables and Hypothesis” and “Constructing a Hypothesis”. Describe some similarities and differences between a question that comes in response to an observation, and a scientific research question? Cite quotes from the readings to support your answer. Where do variables fit into this thinking? In other words, if you imagine a number line with observation questions at one end and scientific research questions at the other, what role do variables play anywhere along this continuum?
Answers
Hypothesis is a proposed explanation for an observable phenomenon. The term comes from the Greek word for "to suppose." Variables, on the other hand, are anything that can be changed or measured. Variables can be independent, dependent, or control variables. Learning activities titled “Hypothesis”, “Variables and Hypothesis” and “Constructing a Hypothesis” share similarities and differences with a question that comes in response to an observation and a scientific research question.
On the other hand, "A scientific research question is more specific and usually relates to a hypothesis. For example, if you hypothesize that birds are attracted to gardens that have bird feeders, your research question might be, 'Does the presence of bird feeders in a garden attract more birds?'" Variables can fit anywhere along this continuum. Variables are anything that can be changed or measured. If you imagine a number line with observation questions at one end and scientific research questions at the other, variables can be used to test hypotheses, support or refute a claim. Variables can be independent, dependent, or control variables. Independent variables are variables that can be manipulated. Dependent variables are variables that depend on the independent variable. Control variables are variables that remain constant throughout the experiment.In conclusion, learning activities titled “Hypothesis”, “Variables and Hypothesis” and “Constructing a Hypothesis” share similarities and differences with a question that comes in response to an observation and a scientific research question. A question that comes in response to an observation is usually general and qualitative while a scientific research question is specific and quantitative. Variables can fit anywhere along the continuum and can be used to test hypotheses, support or refute a claim.For such more question on Hypothesis
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