Answers
Answer:
molarity of KOH is 0.01339. you can see the deail answer at the pic
Related Questions
Please if you know the answer put it thanks
Answers
The diagram shows a picture of a compound.
What is a compound?A compound is a substance that is made up of two or more different elements that are chemically bonded together in a specific ratio.
This means that the elements are combined in a way that creates a new substance with different physical and chemical properties than the individual elements.
Compounds can be formed through a variety of chemical reactions, such as combining elements through a chemical bond or through a reaction between an acid and a base.
So for the given diagram, we can see that it represents two or more elements chemically combined.
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what is special about the nobel gases?
Answers
Answer:
They are in gaseous state at room temperature. They are the least reactive elements. They generally do not combine with other atoms.
Answer:
Explanation: Noble gases are odorless, colorless, nonflammable, and monotonic gases that have low chemical reactivity.
The full valence electron shells of these atoms make noble gases extremely stable and unlikely to form chemical bonds because they have little tendency to gain or lose electrons.
They traditionally have been labeled Group 0.
Minerals with ____ element will react to a weak acid chemical (HCL) test
Answers
Answer:
calcium
Explanation:
1. How many mL of CH3OH are present in a 17.1 v/v% solution which also contains 320 mL of water?
Do not include units in your answer.
2. What is the m/m% of a solution which contains 8.5 lbs of NaCl dissolved in 29.3 lbs of water?
Report your answer to 2 significant figures and without units.
3. How many grams of NaCl are present in a 194 mL sample of 6.5 M solution?
Report your answer without units.
Answers
The volume of methanol is 54.72 ml, m/m% of solution is 29% and mass of NaCl present is 73.76g
The mole is an amount unit similar to familiar units like pair, dozen, gross, etc. It provides a specific measure of the number of atoms or molecules in a bulk sample of matter.
A mole is defined as the amount of substance containing the same number of atoms, molecules, ions, etc. as the number of atoms in a sample of pure 12C weighing exactly 12 g.
Given,
1. v/v% = 17.1 %
This means that 17.1 ml of methanol is present in 100 ml of water.
so, 320 ml of water has 0.171 × 320 = 54.72 ml
2. Mass of NaCl = 8.5 lbs
Mass of water = 29.3 lbs
mass of NaCl in 1 lbs = 8.5 / 29.3 = 0.29 lbs
m/m% = 29%
3. Volume of NaCl = 194 ml
Concentration of NaCl = 6.5 M
Moles of NaCl = 0.194 × 6.5 = 1.261 moles
Mass of NaCl = 1.261 × 58.5 = 73.76g
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What was the main purpose of the opportunity rover?
Answers
Answer:
Explanation:The major goals of the two rovers, according to NASA, were to determine whether life as we know it could ever have arisen on Mars (focusing particularly on searching for ancient water) and characterizing the climate and geology of
Answer:
The major goals of the two rovers, according to NASA, were to determine whether life as we know it could ever have arisen on Mars (focusing particularly on searching for ancient water) and characterizing the climate and geology of the planet
In the following experiment, a coffee-cup calorimeter containing 100 mL
of H2O is used. The initial temperature of the calorimeter is 23.0 ∘C
. If 6.60 g of CaCl2 is added to the calorimeter, what will be the final temperature of the solution in the calorimeter? The heat of solution ΔHsoln of CaCl2 is −82.8 kJ/mol
.
Assume that the specific heat of the solution formed in the calorimeter is the same as that for pure water: Cs=4.184 J/g⋅∘C
.
Express your answer with the appropriate units.
Answers
In the following experiment, a coffee-cup calorimeter containing 100 mL of \(H_{ 2} O\) is used. The initial temperature of the calorimeter is 23.0 ∘C. If 6.60 g of \(CaCl_{2}\) is added to the calorimeter, Final temperature of the solution in the calorimeter = 11.
The first step in solving this problem is to calculate the number of moles of \(CaCl_{2}\\\) added to the calorimeter.
Moles of \(CaCl_{2}\) = mass of \(CaCl_{2}\) / molar mass of \(CaCl_{2}\)
Moles of\(CaCl_{2}\) = 6.60 g / 110.98 g/mol (molar mass of \(CaCl_{2}\)
Moles of\(CaCl_{2}\) = 0.0594 mol
We can use the equation for heat transfer to find the change in temperature of the solution. q = mCsΔT, where q is the heat transferred, m is the mass of the solution, Cs is the specific heat of the solution, and ΔT is the change in temperature.
We know that the initial temperature of the calorimeter is 23.0 ∘C and the mass of the solution is 100 g (since the density of water is 1 g/mL). We can solve for ΔT: ΔT = q / mCs
To find q, we can use the enthalpy change of solution (ΔHsoln) and the number of moles of\(CaCl_{2}\)added: q = ΔHsoln x moles of\(CaCl_{2}\)
q = -82.8 kJ/mol x 0.0594 mol
q = -4.92 kJ
Now we can solve for ΔT: ΔT = (-4.92 kJ) / (100 g x 4.184 J/g⋅∘C)
ΔT = -11.8 ∘C
We can find the final temperature of the solution by adding the change in temperature to the initial temperature: Final temperature = 23.0 ∘C - 11.8 ∘C =11 ∘C.
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Which change in this process would shift the equilibrium to produce the
maximum possible NH3?
3H2 + N2 2 2NH3 + energy
A. Removing the N2 as it forms
B. Removing the NH3 as it forms
c. Decreasing the pressure
D. Increasing the temperature
Answers
Answer: B I think, I'll put my reasoning below.
Explanation:
It's not A because removing N2 would only shift the equation the opposite way.
It's not C and D because I don't think those affect the specific amount of each reactant/product produced. I think temperature only affects the speed at which the reaction is performed, which won't affect anything in this case.
Removing the ammonia as it forms is the correct answer to produce the maximum possible NH₃.
What is Haber's Process ?It is an industrial process for manufacturing ammonia by reaction of nitrogen with hydrogen.
N₂+3H₂ ⇌ 2NH₃
The reaction is reversible and exothermic
To answer this question we will consider all the options and answer
Option D ) Increasing Temperature
Haber's process requires an optimal temperature of 450°C ,on Increasing temperature the yield of ammonia gets slow down.
Option C) Decreasing Pressure
Haber's Process requires high pressure to drive the reaction , higher the pressure more is the yield.
Option A ) Removing the N₂ as it forms , on removing N₂ the reaction will drive on the reverse side hence low yield of NH₃ .
Option B) Removing the NH₃ as it forms , this can actually increase the yield as removing the ammonia will lead to shift the equilibrium and therefore increasing the yield.
Therefore Option B , Removing the ammonia (NH₃) as it forms is the correct answer to produce the maximum possible NH₃.
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if you add 50 mL of water to 100mL of a 0.15M NaOH solution what will be the molarity of the diluted solution
Answers
Answer:
0.1M
Explanation:
Molarity = \(\frac{mole}{volume}\)
Let d be the diluted solution, let i be the initial solution
\(C_{d} V_{d} = C_{i}V_{i}\)
\(C_{d} = \frac{C_{i}V_{i}}{V_{d}}\)
= 0.15 x (100x10^-3) / (50x10^-3)+(100x10^-3)
= 0.1 M
help me solve it pls
Answers
The term molefraction is an important method which is used to calculate the concentration of a solution. It is mainly employed to calculate the concentration of a binary solution. Here the molefraction is 1 / 5. The correct option are D, D and B.
Molefraction of any component of a solution is defined as the ratio of the number of moles of that component to the total number of moles of the solution. The sum of molefraction of solute and solvent is one.
Here the molefraction of nitrogen = Moles of nitrogen / Total number of moles
1. 'x' of 'N' = 2 / 5 + 3 + 2 = 0.2 or 1 / 5
2. Molefraction of Argon = 0.60 / 0.40 + 0.04 + 0.60 = 0.57
Partial pressure = Molefraction × Total pressure
0.57 × 6.3 = 3.59 atm
3. 20 cm³ mixture contains:
20 × 1 mole / 22400 m³ = 8.9286 × 10⁻⁴
1 mole occupies 22400 cm³
8.9286 × 10⁻⁴ × 22400 cm³ / 1 mole = 20 cm³
Thus the correct option are D, D and B.
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help someone i need this
Answers
17. Which of the following
hydrocarbon undergo addition
reaction:
С3Н6
С2Н6
ОООО
С3Н8
CH4
Answers
Answer:
С3Н6.
Explanation:
Hello!
In this case, since addition reactions imply that a radical or some radicals are added to the parent chain, we notice that only unsaturated hydrocarbons are able to undergo addition whereas saturated ones undergo substitution reactions as they already have all the carbon bonds bonded to leaving groups.
In such a way, we can rule out C2H6, C3H8 and CH4 as they are all alkanes; therefore, only С3Н6 is able to undergo an addition reaction due to the C=C which is able to lose one of those bonds and allow an incoming radical to get included into the parent chain.
Best regards!
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
The learning activities titled "Hypothesis," "Variables and Hypothesis," and "Constructing a Hypothesis" all share certain similarities and differences. A question that arises in response to an observation is similar to a scientific research question in that both require some level of investigation to achieve an answer. However, scientific research questions are typically more specific and refined, with a defined methodology for obtaining data and verifying results.
The following quotes from the readings illustrate this distinction:"A scientific question is one that can be answered by using scientific investigation. In contrast, an observation question is one that comes in response to observing or experiencing something in the natural world" (Scientific Inquiry: Variables, Hypotheses, and the Scientific Method)."An important feature of a scientific question is that it should be answerable within a reasonable amount of time and with the resources available" (Scientific Inquiry: Variables, Hypotheses, and the Scientific Method)."Research questions can be narrow or broad, depending on the scope of the research" (Constructing a Hypothesis).The concept of variables is crucial to both observation and scientific research questions, but they play different roles depending on where they fall on the continuum. Observation questions are usually less precise and may not require much consideration of variables. On the other hand, scientific research questions are likely to include a rigorous examination of variables and their potential effects."Variables are an essential part of a scientific experiment. They are the things that change in an experiment" (Scientific Inquiry: Variables, Hypotheses, and the Scientific Method)."Variables are important because they can affect the outcome of the research" (Constructing a Hypothesis).In summary, observation questions and scientific research questions share some similarities, but the latter is more specific, has a defined methodology, and may require more consideration of variables.For such more question on Hypothesis
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alminum metal reacts with chlorine gas to give aluminium chloride if 100 gm al is added to 100 gm chlorine gas how many grams of aluminium chloride are produced?
Answers
Answer:
Mass = 124 g
Explanation:
Given data:
Mass of Al = 100 g
Mass of chlorine = 100 g
Mass of aluminum chloride produced = ?
Solution:
Chemical equation:
2Al + 3Cl₂ → 2AlCl₃
Number of moles of Cl₂:
Number of moles = mass/molar mass
Number of moles = 100 g/ 71 g/mol
Number of moles = 1.4 mol
Number of moles of Al:
Number of moles = mass/molar mass
Number of moles = 100 g/ 27 g/mol
Number of moles = 3.7 mol
Now we will compare the moles of AlCl₃ with Al and Cl₂.
Al : AlCl₃
2 : 2
3.7 : 3.7
Cl₂ : AlCl₃
3 : 2
1.4 : 2/3×1.4 = 0.93
Less number of moles of AlCl₃ are produced by Cl₂ thus it will act as limiting reactant.
Mass of AlCl₃:
Mass = number of moles × molar mass
Mass = 0.93 mol × 133.34 g/mol
Mass = 124 g
very small particles of solids and liquids suspended in air are called
Answers
Answer:
aerosols
Explanation:
Which of these is an example of a physical property?
A. Iron combines with oxygen to rust.
B. Potassium reacts in water to form a base.
C. Sodium metal is soft and malleable.
D. Sodium ignites when placed in water.
Answers
What type of energy is due to the motion of an object?
Answers
Answer: kinetic energy
Explanation:
What 2 ions can affect the pH
Answers
5. Helium gas, 3.0 x 10-4g, is dissolved in 200 g of solution. Express this concentration in
parts per million.
Answers
The concentration of Helium gas in the solution is 1.5 parts per million (ppm).
Solving Concentration in Part Per MillionFirst, we need to convert the mass of helium gas to grams:
3.0 x 10⁻⁴g = 0.0003g
Next, we need to find the total mass of the solution:
Total mass of solution = mass of solvent + mass of solute
Since Helium gas is dissolved in the solvent, we can assume that its mass is negligible compared to the mass of the solvent. Therefore, we can use the mass of the solvent (200 g) as the total mass of the solution.
Now we can calculate the concentration of helium gas in ppm:
Concentration (in ppm) = (mass of solute / total mass of solution) x 10^6
Concentration = (0.0003 g / 200 g) x 10^6
Concentration = 1.5 ppm
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Jacinta is learning about the chemicals involved in breathing. Oxygen gas, water vapor, and carbon dioxide are all compounds formed by the chemical reactions between nonmetal elements. Which statement can Jacinta correctly make about the chemical properties of nonmetals?
Answers
The statement that Jacinta can correctly make about the chemical properties of non-metals is:
Non-metals react only with other non-metals. ; option D.
What are elements?Elements are substances that cannot be split into simpler substances by an ordinary chemical process. Hence, elements are the basic building blocks of all matter.
Elements are classified into three types:
metalsmetalloids or semi-metalsnon-metalsMetals are shiny hard substances that are able to conduct heat and electricity.
Metalloids have a mix of the properties of metal and non-metals. For example, metalloids are not shiny but they are able to conduct electricity.
Non-metals are elements that are usually soft and which do not conduct heat and electricity. Non-metals usually exist in the form of gases. Examples of non-metals are the elements present in the substances that are involved in breathing, that is, oxygen gas, water vapor, and carbon dioxide. The elements are oxygen, hydrogen, and carbon.
These elements react with each other chemically to form compounds.
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Complete question:
Jacinta is learning about the chemicals involved in breathing. Oxygen gas, water vapor, and carbon dioxide are all compounds formed by chemical reactions between nonmetal elements. Which statement can Jacinta correctly make about the chemical properties of nonmetals?
A. Many nonmetals react with both metals and nonmetals.
B. Nonmetals are poor conductors of heat and electricity.
C. Many nonmetals are gases at room temperature.
D. Nonmetals react only with other nonmetals.
Determine the Concentration of the Unknown Strong Acid
In this activity you will use the virtual lab to determine the concentration of a strong monoprotic acid. To do this, you can perform
a titration using NaOH and phenolphthalein found in the virtual lab. (Note: The concentration of the acid is between 0.025M and
2.5M so you will need to dilute the NaOH solution so that the volume to reach the endpoint is between 10 and 50 mL).
Once you have determined the concentration of the acid, please enter your answer into a form at the bottom of this page.
Virtual
Lab
File -
Edit -
View
Help -
EN
Unknown Acid Problem
Stockroom
Workbench 1
Solutions
Glas
Tools
MacBook Pro
888
%
&
Answers
The reaction
H2(g) + I2(g) → 2HI(g)
proceeds via a two-step mechanism in which the rate law for the rate-determining step is
rate = k[H2][I]2.
Write the mechanism for the reaction.
Answers
Answer:
The cell organelles are - Endoplasmic Reticulum, Ribosomes, Golgi apparatus,Lysosomes, Mitochondria, Plastids, Vacuoles, Peroxisomes and Centrosome.
Which of the following would be produced when two or more different atoms bond chemically?
O A. compounds
.
B. elements
C. solutions
D. mixtures
Answers
Answer:
When two or more atoms chemically bond with each other, the resultant chemical structure is a molecule. The familiar water molecule, H2O, consists of two hydrogen atoms and one oxygen atom; these bond together to form water, irdk but it's either C or D
Explanation:
hope this helps have a good rest of your day :) ❤
Which of the following set of quantum numbers (ordered n, ℓ, mℓ ) are possible for an electron in an atom? Check all that apply
a. 2, 1, 3
b. 5, 3, -3
c. 4, 3, -2
d. -4, 3, 1
e. 2, 1, -2
f. 3, 2, 2
g. 3, 3, 1
Answers
the possible quantum numbers (ordered n, ℓ, mℓ ) are:Option B.5, 3, -3 and Option C. 4, 3, -2
The quantum numbers n, ℓ, mℓ represent respectively the principal quantum number, the orbital angular momentum quantum number and the magnetic quantum number.
These are the three most important quantum numbers. T
here is another quantum number called the spin quantum number, denoted by ms.
Let's see which of the given quantum number sets is possible.2, 1, 3 is not possible because for ℓ = 1, mℓ can only be -1, 0, or 1. 5, 3, -3 is possible.4, 3, -2 is possible. -4, 3, 1 is not possible.
For any value of ℓ, mℓ must be between -ℓ and +ℓ. e. 2, 1, -2 is not possible because for ℓ = 1, mℓ can only be -1, 0, or 1. f. 3, 2, 2 is not possible because for ℓ = 2, mℓ can only be -2, -1, 0, +1, or +2. g. 3, 3, 1 is not possible because for any value of ℓ, mℓ must be between -ℓ and +ℓ.
Therefore, the possible quantum numbers (ordered n, ℓ, mℓ ) are:5, 3, -34, 3, -2
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Based on a Kc value of 0.250 and the given data table, what are the equilibrium concentrations of XY, X, and Y , respectively?
Answers
From the solution that we have in the question;
The concentration of X and Y is 0.28 MThe concentration of XY is 0.32 MWhat is the equilibrium constant?The equilibrium constant, denoted as K, is a value that quantitatively represents the ratio of the concentrations of products to reactants at equilibrium in a chemical reaction.
It is a fundamental concept in chemical equilibrium.
The value of the equilibrium constant provides valuable information about the position of equilibrium and the relative concentrations of species involved in a chemical reaction.
Kc = [X] [Y]/[XY]
\(0.25 = (0.1 + x)^2/(0.5 - x)\)
\(0.25(0.5 - x) = (0.1 + x)^2\)
\(0.125 - 0.25x =0.01 + 0.2x + x^2\\ x^2 + 0.45x - 0.115 = 0\)
x = 0.18 M
The equilibrium amount of X and Y= 0.28 M and the equilibrium concentration of XY = 0.32 M
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Based on the answer to the question that we have;
A 0.28 M concentration of X and Y exists at equilibriumXY's concentration at equilibrium is 0.32 M.The equilibrium constantThe ratio of the product to reactant concentrations in a chemical reaction at equilibrium is represented quantitatively by the equilibrium constant, abbreviated as K.
It is a cornerstone of the theory of chemical equilibrium.
A chemical reaction's equilibrium position and the relative concentrations of the species involved can both be learned from the equilibrium constant's value.
Kc = [X][Y]/[XY]
\(0.25 = (0.1 + x)^2/(0.5 - x)\\0.25(0.5 - x) = (0.1 +x)^2\\0.125 - 0.25x = 0.01 +0.2x +x^2\\= 0.18 M\)
The equilibrium concentration of;
XY =0.5 - 0.18
=0.32 M
Then the equilibrium amount of
X and Y is
0.1 + 0.18= 0.28 M.
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What system is used to help match DNA from crime scenes to a DNA database?
A.
CODIS
B.
AFIS
C.
NIBIN
D.
FBI
Answers
Answer:
A. CODIS
Explanation:
The Combined DNA Index System (CODIS), administered by the FBI, maintains DNA profiles obtained through federal, state, and local DNA sample collection programs, and makes this information available to law enforcement agencies across the country for law enforcement identification purposes.
In which case are the white balls the maximum distance, and the maximum angle apart?
Answers
The maximum distance between the two white balls is 2R, and the maximum angle between them is 180 degrees (or π radians).
How to solveMaximum distance between the balls:
The maximum distance between the two white balls will be achieved when they are placed at opposite ends of a diameter of the circular region.
In this case, the distance between them will be equal to the diameter of the circle, which is 2R.
Maximum angle between the balls:
To find the maximum angle between the two balls, imagine the center of the circle as the vertex of the angle, and the positions of the two balls as the endpoints of the angle's two sides.
Since the balls are located at opposite ends of a diameter, the angle formed will be a straight angle, which is 180 degrees (or π radians).
So, the maximum distance between the two white balls is 2R, and the maximum angle between them is 180 degrees (or π radians).
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Two white balls, A and B, are placed on a flat surface inside a circular region of radius R. What is the maximum distance and maximum angle between the balls that can be achieved
The phases of the moon.
Can be predicted years into the future a
Always happen in the same pattern b
Can occur in ANY order c
a and b are correct d
Answers
Answer:
c. or b._____________
Explanation:
correct me
P-32 has a half-life of 14.28 days. 5 grams remain unchanged after 42.84 days. What was the initial amount of P-32?
Answers
Answer:
sus
Explanation:
sus
Calculate the moles of ammonia present in a 7.686 g sample of ammonia, which has a molar mass of 17.030 g/mol. Type answer:
Answers
The number of moles of ammonia present in a 7.686 g sample of ammonia, which has a molar mass of 17.030 g/mol is 0.45 moles.
HOW TO CALCULATE NUMBER OF MOLES:
The number of moles of a substance can be calculated by dividing the mass of the substance by its molar mass. That is;no. of moles = mass (g) ÷ molar mass (g/mol)According to this question, there are 7.686g of ammonia sample and has a molar mass of 17.030 g/mol. The number of moles is as follows. no. of moles = 7.686g ÷ 17.030g/molno. of moles = 0.45 moles. Therefore, the number of moles of ammonia present in a 7.686 g sample of ammonia, which has a molar mass of 17.030 g/mol is 0.45 moles.Learn more about how to calculate number of moles at: https://brainly.com/question/11907810?referrer=searchResults
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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