what is the first volume measurement (lower volume) where the second largest change in ph occurs? (1pts) what is the second volume measurement (higher volume) where the second largest change in ph occurs? (1pts) take the average of these two volumes to find where the first equivalence point occurs. what is the volume needed to reach the first equivalence point? (1pts) volume at 50% of the first equivalence point. (2pts) estimate the ph at 50% volume of the first equivalence point. this represents pka1. (2pts) what is the ka1? identify the second equivalence point on the titration curve. first, find the two volume measurements where the largest change in ph occurs. then, take the average of these two volumes to find where the equivalence occurs. (1pts) what is the first volume measurement (lower volume) where the largest change in ph occurs? (1pts) what is the second volume measurement (higher volume) where the largest change in ph occurs? (2pts) take the average of these two volumes to find where the second equivalence point occurs. what is the volume needed to reach the second equivalence point? (1pts) volume at 50% between the first and second equivalence point. (1pts) estimate the ph at the volume 50% between the first and second equivalence point. this represents pka2. (2pts) what is the ka2?
Answers
The pH curve is initially basic for the titration of a weak base with a strong acid, and it has an acidic equivalence point (pH 7).
How can I locate the titration curve's initial equivalency point?The point on the curve where the equivalency occurs is where the graph is steepest. The colour shift that happens during titration shows that the pH at this spot changes quickly and abruptly.
What is the pH of a strong acid and a strong base at equivalence point --?In a strong acid-strong base titration, the acid and base will react to produce a neutral solution. Water will be created when the hydronium (H+) and hydroxide (OH-) ions react at the reaction's equivalence point. Resulting in pH of 7. This is valid for all titrations involving potent acids and bases.
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Related Questions
Is salt more or less dense than water?
Answers
Answer:
less dense
Explanation:
because when u put it in it sinks
Answer:
salt is more denser than water.
Explanation:
it makes the mass of water denser.
Freezing point depression is a colligative property.The freezing point of pure water is 0.0°C. How many grams of ethylene glycol (C2H6O2) must be mixed in 100.0 g of water to lower the freezing point of the solution to -4.3°C?_______ g
Answers
Explanation:
The freezing point depression is a colligative property. We have to find the mass of ethylene glycol that we have to add to 100.0 g of water to change its freezing point from 0.0 °C to -4.3 °C.
The freezing point depression for a solution can be calculated using the following equation:
ΔTf = kf * molality * i
Where ΔTf is the freezing point depression, kf is the freezing point depression constant (it depends on the solvent and for water is 1.86 °C/m), molality is the molality of the solution and i is the Van't Hoff factor.
The Van't Hoff factor represents the number of particles formed when that compound dissolves. In our case the solute is ethylene glycol, a covalent compound, so it won't form ions when dissolved in the water. Then i is equal to 1.
The temperature must change from 0.0 °C to -4.3 °C, then the freezing point depression is 4.3 °C. So we know that:
i = 1 kf = 1.86 °C/m ΔTf = 4.3 °C
We can replace those values in the formula and find the molality of the solution.
ΔTf = kf * molality * i
4.3 °C = 1.86 °C/m * molality * 1
molality = 4.3 °C/(1.86 °C/m)
molality = 2.31 m
Now we can get the moles of ethylene glycol from the definition of the molal concentration. Molality are the moles of solute per kg of solvent. The mass of water is 100 g.
mass of solvent = 100.0 g * 1 kg/(1000 g)
mass of solvent = 0.100 kg
molality = moles of solute/(mass of solvent in kg)
moles of solute = molality * mass of solvent in kg
moles of solute = 2.31 m * 0.100 kg
moles of solute = 0.231 moles
And finally we can convert the moles of ethylene glycol to grams using its molar mass.
molar mass of C₂H₆O₂ = 62.07 g/mol
mass of C₂H₆O₂ = 0.231 moles * 62.07 g/mol
mass of C₂H₆O₂ = 14.4 g
Answer: 14.4 g of ethylene glycol must be mixed.
The data in the table below represents the pressure of the gas as the temperature changes. Plot a graph of this data, using the blank graph provided below. Draw a trend line and calculate its slope. How are the variables related? What will the pressure of the gas be at 0°C?
Answers
Answer: A
Explanation:
If you assumed 100 total atoms in a sample, how could you relate the % values
shown in the sim into a number you could use for your calculation of average
masses?
Answers
Answer:
use the percent as the abundance and multiply it by the atomic mass and add the values together
Explanation: idk but i got it from quizlet
We have that the % values shown in the sim into a number you could use for your calculation of average masses is given as
\(Avg M=\frac{\sum(atomic masses of every existing element)}{100 atoms}\)
From the question we are told
If you assumed 100 total atoms in a sample, how could you relate the % values shown in the sim into a number you could use for your calculation of average masses?
Generally
We will consider that the 100 total atoms as the the atoms at a 100 percent
The substance at a 100 atoms is to be calculated and is to be given as
Generally the equation for the average atomic mass is mathematically given as
\(Avg M=\frac{\sum(atomic masses of every existing element)}{100 atoms}\)
Therefore
Now, the % values shown in the sim into a number you could use for your calculation of average masses is given as
\(Avg M=\frac{\sum(atomic masses of every existing element)}{100 atoms}\)
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Net ionic equation for potassium sulfide and magnesium iodide
Answers
The net ionic equation for the reaction between potassium sulfide and magnesium iodide is S2- + Mg2+ -> MgS, as the potassium and iodide ions are spectator ions and do not participate in the reaction.
To determine the net ionic equation for the reaction between potassium sulfide (K2S) and magnesium iodide (MgI2), we first need to identify the ions present in each compound and then determine the products formed when they react.
Potassium sulfide (K2S) dissociates into two potassium ions (K+) and one sulfide ion (S2-):
K2S -> 2K+ + S2-
Magnesium iodide (MgI2) dissociates into one magnesium ion (Mg2+) and two iodide ions (I-):
MgI2 -> Mg2+ + 2I-
Now, we need to determine the possible products when these ions combine. Since potassium (K+) has a +1 charge and iodide (I-) has a -1 charge, they can combine to form potassium iodide (KI):
K+ + I- -> KI
Similarly, magnesium (Mg2+) and sulfide (S2-) can combine to form magnesium sulfide (MgS):
Mg2+ + S2- -> MgS
Now, we can write the complete ionic equation by representing all the ions present before and after the reaction:
2K+ + S2- + Mg2+ + 2I- -> 2KI + MgS
To obtain the net ionic equation, we remove the spectator ions, which are the ions that appear on both sides of the equation and do not participate in the actual reaction. In this case, the spectator ions are the potassium ions (K+) and the iodide ions (I-).
Thus, the net ionic equation for the reaction between potassium sulfide and magnesium iodide is:
S2- + Mg2+ -> MgS
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The following balanced equation shows the formation of water.
2H2 + O2 Right arrow. 2H2O
How many moles of oxygen (O2) are required to completely react with 27.4 mol of H2?
Answers
The number of moles of oxygen (O2) required to completely react with 27.4 mol of H2 is 13.7 moles.
How to calculate number of moles?The number of moles of a substance can be calculated using stoichiometry as follows:
The following balanced chemical equation is given as follows:
2H2 + O2 = 2H2O
According to this question, 2 moles of hydrogen gas (H2) reacts with 1 mole of oxygen gas (O2).
This means that 27.4 moles of hydrogen gas (H2) will react with 27.4/2 = 13.7moles of oxygen gas.
Therefore, the number of moles of oxygen (O2) required to completely react with 27.4 mol of H2 is 13.7 moles.
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If you have 2.60 X 1023 molecules of (NH4)3PO4, how many grams do you have?
Answers
If you have 2.60 x 10²³ molecules of (NH₄)₃PO₄, you have 64.7 grams of it.
The number of particles contained in a sample is measured in terms of the mole. One mole of a compound is the quantity of that substance that has a mass in grams equal to its relative atomic or molecular mass (atomic weight).To find the number of moles of (NH₄)₃PO₄, we'll need to use the Avogadro constant, which is 6.02 x 10²³. We can use the formula:moles = particles ÷ Avogadro constantThe number of particles is given as 2.60 x 10²³. Substituting the values:moles = 2.60 x 10²³ ÷ 6.02 x 10²³moles = 0.432Molar massNow that we have the number of moles of (NH₄)₃PO₄, we can compute its mass. The molecular mass of (NH₄)₃PO₄ is 149.0 g/mol. We can use the formula:mass = moles x molecular mass Substituting the values:mass = 0.432 x 149.0mass = 64.7 grams
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Why
was Bohr's model important in understanding the atom?
Answers
Answer:
It was the first model to explain Rutherford's scattering experiments which showed that almost all the mass in an atom is concentrated around a small point. Bohr was also the first to show how a kind of wave model of electrons could produce the spectral lines
The temperature on Mercury may drop to −273 °F at night. What is this temperature in degrees Celsius?
Answers
12. 5.6g of solid copper was heated with 476.2 J at room temperature (25°C). Given that
copper has a C of 0.38 J/g°C, what would its final temperature be?
Answers
Answer:
The final temperature of the copper would be 311.3°C.
I hope this helps you
Which of the following is a possible
way to describe the SO3 component in
the reaction below?
Sa(s) + 120₂(g) → 8SO3(g)
A. 8 atoms SO3
B. 8 molecules SO3
C. 80.07g SO3
D. 32 LSO3
Answers
The correct answer is B. 8 molecules \(SO_3\). Option B
In the given reaction:
S(s) + \(O_2\)(g) → \(SO_3\)(g)
The stoichiometric coefficient in front of the \(SO_3\)molecule is 8, which indicates that 8 molecules of \(SO_3\)are formed as a product. This coefficient represents the ratio of the number of molecules involved in the reaction.
Option A (8 atoms \(SO_3\)) is incorrect because it only mentions the number of atoms, not molecules. The stoichiometric coefficient does not represent the number of atoms, but rather the number of molecules.
Option C (80.07g \(SO_3\)) is incorrect because it mentions a specific mass. The stoichiometric coefficient does not directly represent the mass of the substance, but rather the relative amount of molecules involved in the reaction.
Option D (32 \(SO_3\)) is incorrect because it mentions a specific volume. The stoichiometric coefficient does not directly represent the volume of the substance, but rather the relative amount of molecules involved in the reaction.
Therefore, the correct way to describe the \(SO_3\)component in the reaction is option B: 8 molecules \(SO_3\). This represents the ratio of the number of molecules of \(SO_3\)that are produced in the reaction.
Option B
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Question 2 of 10
Which chemical equation is balanced?
A. CO₂ + H₂O → H₂CO₂
B. K+ H₂O → K₂O + H₂
C. CaO2 + HCl → CaCl₂ + H₂O
OD. MgO + 2HCl → MgCl₂ + H₂O
Answers
The equation MgO + 2HCl → MgCl₂ + H₂O is a balanced equation.
A balanced chemical equation contains equal number of atoms on both sides of the equation.The equation is MgO + 2HCl → MgCl₂ + H₂O which contains 1 atom of Mg, 2 atoms of chlorine, 2 atoms of chlorine, 1 atom of oxygen on both reactants and products sides.So the equation is balanced.An equation for a chemical reaction is said to be balanced if both the reactants and the products have the same number of atoms and total charge for each component of the reaction. In other words, both sides of the reaction have equal amounts of mass and charge.It follows law of conservation of mass.Mass is neither created nor destroyed rather it can be transferred from one form to another.Learn more about balanced equation at:
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I need help with the second one
Answers
Sorry, your photo isn't clear enough.
How much heat must be added to a 34.2 g sample of aluminum in order to raise the temperature of the aluminum 34 oC? (The specific heat of Aluminum is 0.9 J/g oC)
Answers
The amount of heat required to raise the temperature of the 34.2 g sample of aluminum by 34 oC is 1043.52 J.
What is Temperature?
Temperature is a measure of the average kinetic energy of the particles in a substance. It is a physical property that determines the direction of heat flow between two objects or systems in contact with each other. Temperature is measured in degrees Celsius (°C) or Fahrenheit (°F), or in kelvin (K) in the International System of Units (SI).
The amount of heat (q) required to raise the temperature of a substance can be calculated using the formula:
q = m x c x ΔT
Where:
m = mass of the substance (in grams)
c = specific heat of the substance (in J/g oC)
ΔT = change in temperature (in oC)
Plugging in the values given:
m = 34.2 g
c = 0.9 J/g oC
ΔT = 34 oC
q = (34.2 g) x (0.9 J/g oC) x (34 oC)
q = 1043.52 J
Therefore, the amount of heat required to raise the temperature of the 34.2 g sample of aluminum by 34 oC is 1043.52 J.
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Indicate the hypotheses and the statistical test to be used to analyze the data.
We are interested in the relationship between carbon monoxide concentrations and density of cars in a particular area of Riverside. For a particular street corner on 20 different days, we measure carbon monoxide levels and the number of cars per hour.
Answers
It is assumed that a researcher is interested in examining the connection between a population's carbon monoxide levels and the density of automobiles.
It is evident from the study question that there are two factors: the amount of carbon monoxide present and the density of automobiles. The researcher is interested in determining how closely the variables are related. As a result, the study topic is one of association. The interval/ratio scale is used to assess both variables. The connection is presumed to be linear, and the data's simple random samples can be considered to come from a bivariate normal population. The Pearson correlation test is the right statistical analysis to employ since the variables are assessed on an interval ratio scale.
The following is the null hypothesis:
H0:=0: There is no relationship between carbon monoxide levels and automobiles density.
The alternative theory is as follows:
H0: 0: There is a substantial linear link between the density of automobiles and the carbon monoxide concentration.
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the difference between Major purchase Consumer good
Answers
A major purchase refers to a high-cost item or service that is considered a significant investment for an individual or household, such as a car, home, or college education. Major purchases usually involve a large sum of money and require careful planning and consideration before a final decision is made.
Any item that a person or a household buys for their own use or consumption is called a consumer good. Durable and non-durable goods are two types of consumer goods that can be classified. Consumer goods are tangible items that people or households buy for their own use or consumption.
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Your question is incomplete, most probably the complete question is:
The difference between Major purchase and Consumer good?
True or False: Most metals are found to occur naturally in their uncombined states.
Answers
Answer:
I think it's true. But I'm not sure
Answer:
True
Explanation:
True or false. The geological features of the eastern part of South America and western Africa matched each other.
Answers
Answer:
True
Explanation:
If you look at a map they look like they connect and the have similarities like mountains
Answer:
It is true c:, I hope I helped yoy
Dimensional analysis with shapes
Answers
The surface area of the rectangular prism is 0.034 square meters.
For a rectangular prism with length l, width w, and height h, the surface area is:
Surface area = 2lw + 2lh + 2wh
Substituting the given values, we get:
Surface area = 2(10 cm x 5 cm) + 2(10 cm x 8 cm) + 2(5 cm x 8 cm)
Surface area = 100 cm² + 160 cm² + 80 cm² = 340 cm²
We can use dimensional analysis. So the conversion factor is:
1 m² / 10,000 cm²
Multiplying the surface area by this conversion factor, we get:
Surface area = 340 cm² x (1 m² / 10,000 cm²)
Surface area = 0.034 m²
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--The complete Question is, What is the surface area of a rectangular prism that has a length of 10 cm, a width of 5 cm, and a height of 8 cm? Use dimensional analysis to convert the answer to square meters--
What type of reaction is Mg + Cl2 → MgCl2?
O A. Decomposition
O B. Synthesis
O C. Double-replacement
O D. Single-replacement
Answers
The reaction Mg + Cl2 → MgCl2 is a synthesis reaction. Option B
What is a synthesis reaction?
We kno0w that in a chemical reaction there is the combination of two or more substances so as to get the product of the reaction. In this case there is the combination of the magnesium and the chlorine and the product is the magnesium chloride.
In the reaction, we have two substances that have been mixed together and then we have a single product that have been formed from the two. The formation of one product means that it is a synthesis reaction.
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A chemical reaction happens in three steps.
Step 1:Step 2:Step 3:A→B+CC→D+ED+A→F(fast)(slow)(fast)
What is the rate-determining step?
Answers
The rate-determining step for the given chemical reaction is Step 2 only.
This is because the rate of a chemical reaction is determined by the slowest step in the reaction mechanism, which is called the rate-determining step. In this reaction, Step 1 is fast, meaning it occurs much more quickly than Step 2, and Step 3 is also fast, meaning it does not limit the overall rate. Therefore, Step 2 is the only step that controls the rate of the reaction.
Knowing the rate-determining step is important for understanding the kinetics of the reaction and optimizing reaction conditions to maximize the yield or selectivity of the desired products. In this case, increasing the concentration of the reactants involved in Step 2 would increase the rate of the reaction, while increasing the concentrations of the other reactants would have no effect on the rate.
Therefore, the rate-determining step for the given chemical reaction is Step 2 only.
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Someone help me do each piece of evidence in 2-4 sentences
No definitions
No go*gle
Claim 1: The Moon’s appearance changes because Earth casts a shadow on the Moon.
Claim 2: The Moon’s appearance changes because the position of the Moon changes.
Answers
Claim 1: occurs during full moon phase
Claim 2: the orbital function of the moon to cast full moon, new moon and crescent moon phases.
How are the moon appearances described?Claim 1: The Moon's appearance changes due to Earth casting a shadow on it during a lunar eclipse. During this event, the Earth is positioned between the Moon and the Sun, and the Earth's shadow falls on the Moon, creating a reddish-brown hue. This phenomenon can only occur during a full moon phase.
Claim 2: The Moon's appearance changes due to its position relative to the Earth and the Sun. As the Moon orbits around the Earth, the amount of sunlight that reflects off of it changes, causing different phases, such as full moon, new moon, and crescent moon. Additionally, the Moon's position in the sky changes over time, which can affect its visibility and apparent size.
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Pls help !
What happens to the speed of a tsunami wave as it approaches the shore?
It increases and then decreases.
It increases.
It remains at a constant speed.
It decreases.
Which term represents when a tsunami wave slows down as it reaches shore?
surfing
waving
sinking
shoaling
Answers
Answer: It decreases.
Explanation:
mass
What is the percent composition by mass of
nitrogen in the compound N,H, (gram-formula
32 g/mol)?
(1) 13%
(3) 88%
(2) 44%
(4) 93%
Answers
Answer: 88%
Explanation:
Nerve impulses are picked up by a neuron’s:
(1) dendrites
(2) axon
(3) synapse
(4) neurotransmitter
Answers
How many 20 mL extractions of organic solvent are needed to extract at least 99.5% of 50.0 g Compound A from 100 mL of water if K
Answers
Answer:
5 extractions to extract at least 99.5% of 50.0 g Compound A from 100 mL of water
Explanation:
If K=10...
Partition coefficient is defined as the ratio of concentrations of a compound A in two inmiscibles solvents:
K = 10 = Conc. Organic solvent / Conc. Water
Usually organic phase over aqueous phase.
In the first 20mL extraction, the organic solvent will extract:
10 = X / 20mL / (50.0g - X) / 100mL
10 = 100X / (1000-20X)
10000 - 200X = 100X
10000 = 300X
X = 33.3g of compound A are extracted in the first extraction
Remember you want to extract 99.5%, that is 50.0g*99.5% = 49.75g
In the aqueous phase remain: 50-33.3g = 16.7g:
Second extraction:
10 = X / 20mL / (16.7g - X) / 100mL
10 = 100X / (334-20X)
3340 - 200X = 100X
3340 = 300X
11.1g are extracted and will remain: 16.7g - 11.1g = 5.6g
Third extraction:
10 = X / 20mL / (5.6g - X) / 100mL
10 = 100X / (112-20X)
1120 - 200X = 100X
1120 = 300X
3.8g are extracted and will remain: 5.6g - 3.8g = 1.8g
Fourth extraction:
10 = X / 20mL / (1.8g - X) / 100mL
10 = 100X / (36-20X)
360 - 200X = 100X
360 = 300X
1.2g are extracted and will remain: 1.8g -1.2g = 0.6g
Fifth extraction:
10 = X / 20mL / (0.6g - X) / 100mL
10 = 100X / (12-20X)
120 - 200X = 100X
120 = 300X
0.4g are extracted. The total extractions gives:
33.3g + 11.1g + 3.8g + 1.2g + 0.4g = 49.8g
That means, you need to do:
5 extractions to extract at least 99.5% of 50.0 g Compound A from 100 mL of waterAn increase in the concentrations of greenhouse gases in Earth’s atmosphere would have which of these effects on temperature?
Answers
An increase in the concentrations of greenhouse gases in Earth's atmosphere would cause an increase in the average temperatures on Earth's surface.
The greenhouse effect occurs when gases build up in the upper atmosphere of the Earth, where they absorb solar heat and trap it. Thus, the heat that ought to be fleeing into space is being held back on Earth. The following gases contribute to this effect:
Dioxide of CarbonMethaneNitrogen Oxidewith a ton more. However, the greenhouse effect is mostly caused by them. By retaining heat in the lower (rather than upper) atmosphere, this action will raise temperatures on the surface of the globe.
Heat from the sun would be trapped on Earth as the concentration of greenhouse gases (such the ones described) in the atmosphere increased, resulting in an increase in the global temperature.
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Imagine that you mix 25 g of water at 25 ºC with 25 g of water at 65 ºC. Predict the final temperature of the sample.
Answers
The final temperature of the mixture given that 25 g of water at 25 °C is mixed with 25 g of water at 65 °C, is 45 °C
How do i determine the final temperature of the mixture?The final temperature of the mixture can be obtained by calculating the equilibrium temperature of the mixture. This is shown below:
Mass of cold water (M) = 25 gTemperature of cold water (T) = 25 °CMass of warm water (Mᵥᵥ) = 25 gTemperature of warm water (Tᵥᵥ) = 65 °CEquilibrium temperature (Tₑ) =?Heat loss by warm water = Heat gain by cold water
MᵥᵥC(Tᵥᵥ - Tₑ) = MC(Tₑ - T)
Cancel out C
Mᵥᵥ(Tᵥᵥ - Tₑ) = M(Tₑ - T)
25× (65 - Tₑ) = 25 × (Tₑ - 25)
Cancel out 25
65 - Tₑ = Tₑ - 25
Collect like terms
65 + 25 = Tₑ + Tₑ
90 = 2Tₑ
Divide both side by 2
Tₑ = 90 / 2
Tₑ = 45 °C
Thus, we can conclude that the final temperature the mixture is 45 °C
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At what state is bromine at 100 degree
Answers
Answer:
a liquid
Explanation:
why does titanium have these properties
Answers
Answer
Titanium has the above properties because it belongs to group d- block element
Titanium is a transitional metal and has properties of transition metal.
Titanium d-orbital is partially filled having the following electronic configuration
\(\begin{gathered} The\text{ atomic number of titatium is 22} \\ 1s^22s^22p^63s^23p^64s^23d^2 \end{gathered}\)The valency electron is 2 and this shows that it belongs to group 2 and the d - orbital is partially filled.
General properties of d -block elements ( Transition metal)
1. Form stable complexes.
2. Have high melting and boiling points.
3. Contain a large charge/radius ratio.
4. Form compounds that are often paramagnetic.
5. Are hard and possess high densities.
6. Form compounds with profound catalytic activity.
7. show variable oxidation states.
Hence, Titanium has the above properties because it belongs to group d- block element