A buffer solution is made up of acetic acid (ch3cooh) and sodium acetate (nach3coo). The major equilibria in the buffer system are represented above. Which of the following equilibria could be used to support the claim that the addition of a small amount of naoh to the buffer will result in only a very small change in ph?
The equilibria showing how the acetate buffer adjusts to addition of a small amount of NaOH is:
CH₃COOH (aq) + H₂O (l) → H₃0+ (aq) + CH₃COO (aq)
What is a buffer?A buffer is defined as a solution that resists changes to its pH when little quantity of strong base or acid is added to it.
Buffers are typically made from solutions of weak acids and their salts or weak bases and their salts.
The equilibria showing how a buffer made from acetic acid and sodium acetate (NaCH3COO) adjusts to addition of a small amount of NaOH is as follows:
CH₃COOH (aq) + H₂O (l) → H₃0+ (aq) + CH₃COO (aq)
This is because when NaOH which is a strong base is added, by neutralization action, it will neutralize the hydronium ion which will make the acetic acid ionization equilibrium to shift to the right to produce more of the acetate ion, the conjugate base.
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Of the following statements about protected areas that have been established to preserve biodiversity, which one is not correct?
Answer:
. About 25% of Earth's land area is now protected.
Explanation:
Please mark me brainliest if correct
Find the value of x if your answer is not an integer
Answer: To solve such problems we need to know about Trigonometry.
Trigonometric functions
where perpendicular is the side of the triangle which is opposite to the angle, and the hypotenuse is the longest side of the triangle which is opposite to the 90° angle.
The value of x is 5√3.
Explanation: Given to us,
the base for the triangle, AB = 5 units,
Hypotenuse for the triangle, BC = 10 units,
∠B = 60°,
Solution
The question can be solved in two ways,
1. Using the Pythagoras theorem,
According to Pythagoras theorem,
substituting the values,
2. using the trigonometric function for ∠B,
for ∠B in ΔABC,
substituting the values,
we know that value of tan(60°) is √3,
Hence, the value of x is 5√3.
A block of mass 500 g is attached to a horizontal spring, whose force constant is 25. 0 n/m. The block is undergoing simple harmonic motion with an amplitude of 6. 00 cm. At t=0 the block is 4. 00 cm to the left of its equilibrium position and is moving to the right. At what time t1 will it first reach the limit of its motion to the right?
The time taken for the car to reach the limit or amplitude of the motion is 0.33 s.
Equation for the simple harmonic motion of the block
The equation for the simple harmonic motion of the block is calculated as follows;
y = A sin(ωt + Φ)
where;
A is the amplitudeω is the angular speedt is the time of motionΦ is the phase angleAngular speedThe angular speed is calculated as follows;
[tex]\omega = \sqrt{\frac{k}{m} } \\\\\omega = \sqrt{\frac{25}{0.5} } \\\\\omega = 7.07 \ rad/s[/tex]
Phase angle[tex]\Phi = sin^{-1} (\frac{-4}{6} )\\\\\Phi = -0.73 \ rad[/tex]
The time taken for the car to reach the limit or amplitude of the motion is calculated as follows;
0.06 = 0.06sin(7.07t - 0.73)
1 = sin(7.07t - 0.73)
7.07t - 0.73 = sin⁻¹(1)
7.07t - 0.73 = 1.57
7.07t = 2.3
t = 2.3/7.07
t = 0.33 s
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What is a difference between an authoritarian government and a democratic government brainly
Answer:
The difference between an authoritarian government and a democratic government is that the authoritarian government has complete power/ownership over the country and everyone within the country, while a democratic government the government has very limited power divided in three branches while the citizens choose who gets elected to be in high power on their behalf.
Explanation:
Authoritarian government is on the basis of authority. The leaders of the government control every central part of the government and make changes to the country without its citizens consent or say. Authoritarian government is a very risky/evil form of government because it gives the leaders of the government complete control over every aspect of a person's life that's including entertainment, (by restricting their citizens from different forms of entertainment such as video games) social, (controlling their beliefs and what they feel is wrong or right) and financial which is by limiting how much of THEIR OWN money they can have/spend.
A common example of an authoritarian government would be Russia. Russian citizens do not have a say in what the country does and that is including war. Which is why will see many anti-war protests from Russian citizens during these times, you will also see them getting arrested for these protests. Entertainment, social, and financial control over a group of people's lives is authoritarian.
Democratic government is basically where the citizens of the country have a complete say in who becomes an elected official for their country. Common example of a democratic government is America. People in America choose who makes the decisions on behalf of them in government and Americans even have legislatures in place to make sure the government doesn't get too much power like separation of powers or checks and balances which divides the power between the three branches of government and the citizens are the ones who vote in the elected officials who will run these three branches of government.
They're many differences between an authoritarian government and a democratic government, so I will sum the complete different between the two in one statement. "The difference between an authoritarian government and a democratic government is that the authoritarian government has complete power/ownership over the country and everyone within the country, while a democratic government the government has very limited power divided in three branches while the citizens choose who gets elected to be in high power on their behalf."
Hope this helps.
Kimberly has seven colors of lanyards. she uses three different colors to make a key chain. how many different combinations can she choose?
The number of different combinations can she choose is; 210.
What is the permutation?
We are told that;
Number of colors of Lanyards she has = 7
Number she wants to use to make a key chain = 3 colours
Thus, number of different combinations can she choose is gotten through permutation formula;
P(n, r) = n!/(n - r)!
P(7, 3) = 7!/(7 - 3)!
P(7, 3) = 210
Thus, the number of different combinations can she choose is 210.
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The identity a² – b² = (a + b)(a – b) is true for all values of a and b. Compute the whole number value of 2021² – 2020²
Answer:
Explanation:
Remark
The numbers here when subtracted, make 1.
ie 2021 - 2020 = 1
So all you have is 2020+2021 = 4041
(2021 - 2020)(2021 + 2020) = 4041
This doesn't work for every number you could choose, but it works for these 2.
The underlined portion of the sentence is known as a(n)
Answer:
your answer would be A
Explanation:
An expert in organ transplants, the chief surgeon of the hospital routinely spoke at conferences. "An expert in organ transplants" is an appositive.
Answer:
i think its A
Explanation:
We are all familiar with x-rays. They are used to detect broken bones and other injuries to our skeletal muscular system. Other waves in the electromagnetic spectrum are utilized in the medical field. One type of wave, considered a mutagen, is used in cancer therapy. What is that electromagnetic wave?
Answer:
Yes of course
Explanation:
Isn'to I'm right
Which oxidizing agent will oxidize br− but not cl− ?
The oxidation potential of Br is 1.065 V, and Cl is 1.359 V. Thus, the compound with oxidation potential greater than Br, and lesser than Cl, will oxidize Br, but not Cl.
Which statement best compares the use of imagery and color in the poem and artwork to portray the woman? the artwork’s use of color presents a woman of vigor and action, while the poem does not. The poem portrays the woman as unrefined, while the painting presents her as cultured. The artwork suggests a woman in her home, while the poem’s figurative language connects her to nature. The poem suggests that the woman is aloof, while the painting shows her to be self-absorbed
From the poem the best comparison of the use of imagery and color is that
The artwork suggests a woman in her home, while the poem’s figurative language connects her to nature. A summary of the poemThe summary of this poem is that the woman is said to be seated in front of a mirror to start her daily task of applying makeup. The woman here is a Japanese.
The figurative language that is used makes us to compare her hair, and other parts of her to elements of nature.
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Answer:
The answer is the third one
Explanation:
I'm in the middle of a unit test right now!
The state has the right to impose some limitations on abortion. brainly
Answer:
Supreme Court
Explanation:
I just did the assignment and got it right
The only institution that has the right to impose some limitations on abortion is; Supreme Court.
What are the powers of the supreme court?The only institution that has the right to impose some limitations on abortion is the Supreme Court.
The reason that the answer is supreme court is because it is the highest court of any country and its' main power is judicial review, or the ability of the to declare a Legislative or Executive act in violation of the Constitution that cannot be found within the text of the Constitution itself.
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What was Yellow submarine based on
Answer:
The song inspired the 1968 United Artists animated film Yellow Submarine, which was produced by King Features Syndicate
Explanation:
PLEASE MARK AS BRAINLIEST
When br2(l) boils at its normal boiling point, does its entropy increase or decrease?
Answer: increase
Explanation: when substance boils the disorder becomes greater increasing entropy
Janet wants to solve the equation. What should she multiply both sides of the equation by? y y2 – 1 y + 1 y2 + y + 2
Answer:
B.) y^2-1
Explanation:
honest answer:)
Janet can multiply both the sides by y^2-1.
What is Equation?The numbers on either side of the equal sign in an equation are equal. That is the definition of an equation in mathematics, but an equation can also be used to describe a variety of challenges, situations, or efforts to solve an issue.
The word "equa" that starts the equation is likely already recognizable to you from words like "equal," "equality," and "equate." Making things balance out is the meaning behind each of these words.
A assertion of the equality of two quantities is expressed via an equation. Even if the equation is not mathematical but rather, let's say, interpersonal, you could still attempt to balance the two sides.
Therefore, Janet can multiply both the sides by y^2-1.
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Which of the following is not correct concerning database design? question 2 options: identify all fields needed to produce the required information group related fields into tables determine each table's primary key organize each piece of data into its largest useful part
Answer:
I believe it's the "Organize each piece of data into its largest useful part.
Explanation:
I have a similar quiz and had the same questionnaire so, I am so sorry if you do get it wrong. I just passed this test and it was that answer that choice. Hopefully, you get it right as well.
Answer: :/
Explanation:
________ was once a center of banking and finance, with a thriving capital city, but still hasn't fully recovered from the civil war that plagued it from 1975 to 1990.
Answer:
the answer is Israel, I had the same problem before.
You owe $9,000 in student loans and would like to pay it all off with your commissions. use goal seek to determine the amount you must sell (cell g5) in order for cell g3 (your commission) to equal $9,000 so you can fully pay off your student loans. accept the goal seek solution.
In the Microsoft Excel, the amount you must sell (cell g5) in order for cell g3 (your commission) to equal $9,000 is $18000.
What is Microsoft Excel?Microsoft Excel simply means a spreadsheet that's used for making computations.
In this case, to use goal seek function, one has to go to data, "what if analysis", and then "goal seek".
Here, the amount you must sell in order for your commission to equal $9,000 is $18000.
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A fuel pump at a gasoline station doesn't always dispense the exact amount displayed on the meter. when the meter reads 1.000\text{ l}1.000 l1, point, 000, start text, space, l, end text, the amount of fuel a certain pump dispenses is normally distributed with a mean of 1\text{ l}1 l1, start text, space, l, end text and standard deviation of 0.05\text{ l}0.05 l0, point, 05, start text, space, l, end text. let xxx represent the amount dispensed in a random trial when the meter reads 1.000\text{ l}1.000 l1, point, 000, start text, space, l, end text. find p(x>1.05)p(x>1.05)p, left parenthesis, x, is greater than, 1, point, 05, right parenthesis.
Based on the calculations, the value of [tex]P(x > 1.05)[/tex] is approximately equal to 0.16.
Given the following data:
Sample mean = 1.05Standard deviation = 0.05Mean = 1.000.How to calculate the z-score.In Mathematics, z-scores can either be negative or positive and it is generally calculated by using this formula:
[tex]Z=\frac{x\;-\;u}{\delta}[/tex]
Where:
x is the sample mean.u is the mean.[tex]\delta[/tex] is the standard deviation.Substituting the given parameters into the formula, we have;
[tex]Z=\frac{1.05\;-\;1.000}{0.05}\\\\Z=\frac{0.05}{0.05}[/tex]
Z = 1.0.
Therefore, we have;
[tex]P(x > 1.05)=P(Z > 1)[/tex]
From the z-table, a z-score of 1.0 corresponds to or has a p-value of 0.1587. Therefore, the p-value for this test is 0.1587 > 1.05.
In conclusion, the value of [tex]P(x > 1.05)[/tex] is approximately equal to 0.16.
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Answer:
Explanation:
i got 0.5 on khan
Find f, the magnitude of the force applied to each side of the nutcracker required to crack the nut
To find the equation for f , one must find the sum of the torque which will be :
Σ[tex]\left \ r[/tex]ⁿ = - F D + Fₙ d
When you express the force in terms of Fₙ, d , and D, the equation for (f) will be:
F = [tex]\frac{F{n} {d}}{D}[/tex]
What is the magnitude of the force applied?The magnitude of the net force that is said to be acting on an object is generally said to be the same with the mass of the object and then it is multiplied by the acceleration of the object.
Note that the magnitude of the force is said to be the summation of all the forces that are said to be acting on an object.
See full question below
To crack a nut a force of magnitude (or greater) must be applied on both sides, as shown in the figure. One can see that a nutcracker only applies this force at the point in which it contacts the nut (at a distance from the nutcracker pivot). In this problem the nut is placed in a nutcracker and equal forces of magnitude are applied to each end, directed perpendicular to the handle, at a distance from the pivot. The frictional forces between the nut and the nutcracker are equal and large enough that the nut doesn't shoot out of the nutcracker
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Which is the best factor that is unlikely to limit population growth
An artist has
25
portraits to paint and plans on painting
p
portraits over the weekend. which expression represents how many portraits the artist has remaining to paint after the weekend?
Answer:
i have the same question lol
Explanation:
doing a comp
Engineers define reliability as the probability that an item
Other than his brutal bullying of witnesses, what brought down senator joseph mccarthy in 1954? alleged "communists" called to testify refused to do so. wisconsin voters refused to reelect mccarthy, who lost his seat in the senate. mccarthy hinted that president eisenhower himself was sheltering communists. mccarthy charged that there were communists in the u.s. army.
Answer:
McCarthy charged that there were Communists in the U.S. Army.
Explanation:
The industrialization and mechanization of agriculture in the united states during the past 70 years have resulted in
Answer:
a decrease in the number of farms and an increase in the size of farms?
Explanation:
I hope this helped
Have an AMAZING day. :)
Imagine that 64% of the people living in a remote village in the mountains can taste phenylthiocarbamide (ptc). In order to taste ptc, you must have at least one copy of the dominant ptc taster allele. If the population were in hardy-weinberg equilibrium for the ptc gene, calculate the allele and genotype frequencies as listed below:
If the population were in Hardy-Weinberg equilibrium then the frequency of heterozygous will be 0.48, recessive homo-zygous 0.36 and dominant homo-zygous 0.16.
What is the Hardy-Weinberg equilibrium?The Hardy-Weinberg equilibrium is a model used in population genetics to estimate genotypic and allele frequencies.
The Hardy-Weinberg equilibrium is p2 + 2pq + q2 = 1. In this case, p2 + 2pq is equal to 0.64.
In consequence, q2 = 1 – 0.64 = 0.36 >> q is equal to 0.6 and p = 1 – 0.6 = 0.4.
Finally, the frequency of heterozygous is 2pq (2 x 0.4 x 0.6) = 0.48, recessive homo-zygous is 0.36 and dominant homo-zygous is 0.16 (1 - 0.48 - 0.36 = 0.16).
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How many grams of nacl are present in 11. 00 moles?
Answer:
Mass = 642.84 g
Explanation:
Formula for mass is;
Mass = number of moles × molar mass
Molar mass of NaCl = 58.44 g/mol
Thus;
Mass = 11 × 58.44
Mass = 642.84 g
400 students were randomly sampled from a large university, and 289 said they did not get enough sleep. Conduct a hypothesis test to check whether this represents a statistically significant difference from 50%, and use a significance level of 0. 1
Answer:
The sample proportion represents a statistically significant difference from 50%
Explanation:
The sample proportion is the same as 50%
Alternate hypothesis: The sample proportion is not the same as 50%
z = (p' - p) ÷ sqrt[p(1 - p) ÷ n]
p' is sample proportion = 289/400 = 0.7225
p is population proportion = 50% = 0.5
n is number of students sampled = 400
z = (0.7225 - 0.5) ÷ sqrt[0.5(1 - 0.5) ÷ 400] = 0.2225 ÷ 0.025 = 8.9
The test is a two-tailed test. Using a 0.01 significance level, critical value is 2.576. The region of no rejection of the null hypothesis is -2.576 and 2.576.
One of the most important characteristics of the water molecule is its _____, which allows it to surround and attract both positive and negative ions.
Answer:
Polarity
Explanation:
Covalent bonds may be either polar or nonpolar. Polar molecules, such as water, are asymmetric molecules that have unbalanced electronegativity, leading to slight charges on the atoms within the molecule.
Water's polarity
The chemical equation for water is [tex]H_20[/tex]. In this molecule, oxygen has 2 unbonded electron pairs. This causes the molecule to have a bent geometry. Bent molecules are always polar due to the dipoles formed by the unshared electron pairs. These dipoles create a slight negative charge on the oxygen atom and a slight positive on the hydrogen atoms.
Intermolecular Forces
Due to the slight charges of a water molecule, the oxygen molecules attract positive ions, and the hydrogen atmos attract negative ions. This interaction is known as an ion-dipole intermolecular force (IMF).
Answer:
Polarity
Explanation:
Polarity in a substance or molecules arises when the two combining atoms have different electronegativities. As more electronegative atoms will attract the electrons from electropositive atoms toward itself.
Due to this, there will be development of partial positive charge on electropositive atoms and a partial negative charge on the electronegative atoms.
For example, in water (H₂O) due to the difference in electronegativities of the hydrogen and oxygen atoms, there is a partial positive charge on the hydrogen atoms and a partial negative charge on the oxygen atom.
Due to these charges it is able to attract ions of opposite charges that are surrounding.
Thus, we can conclude that one of the most important characteristics of the water molecule is it's polarity, which allows it to surround and attract both positive and negative ions.
Decide whether the sentence is grammatically correct or incorrect as written. no repites eso. (don't repeat that.) correct incorrect
Answer:
INCORRECT!!!!!!!
Explanation:
The sentence "no repites eso" is grammatically correct in Spanish, but it is not grammatically correct in English. The correct translation of "don't repeat that" in Spanish is "no repitas eso".
What is sentence?A sentence is a group of words that express a complete thought or idea. It is a fundamental unit of language that conveys meaning to the reader or listener.
A sentence typically consists of a subject, which is what the sentence is about, and a predicate, which describes what the subject is doing or what is happening to it.
A sentence can also contain other elements, such as an object or complement, that further describe or modify the subject or predicate. Sentences can vary in length and complexity, from simple one-word sentences to complex sentences with multiple clauses.
Effective sentence construction is important for clear communication, both in written and spoken language. Skilled writers and speakers use a variety of sentence structures to convey their message with precision and impact.
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