What is the volume (in mL) of glacial acetic acid (17.4 M) that would have to be added to 500 mL of a solution of 0.20 M sodium acetate in order to achieve a pH of 5.0
Answer:
3.16mL of glacial acetic acid must be added
Explanation:
The mixture of acetic acid with sodium acetate produce a buffer. The buffer follows the H-H equation:
pH = pKa + log [A⁻] / [HA]
Where pH is the pH of the buffer: 5.0
pKa is pKa of the buffer = 4.74
[A⁻] could be taken as moles of acetate ion = 0.500L * (0.20mol/L) = 0.100mol
And [HA] are moles of acetic acid.
Replacing:
5.0 = 4.74 + log [0.100mol] / [HA]
0.26 = log [0.100mol] / [HA]
1.8197 = [0.100mol] / [HA]
[HA] = 0.100mol / 1.8197
[HA] = 0.05495 moles of acetic acid
As the glacial acetic acid is 17.4M, the volume we must add to prepare the buffer is:
0.05495 mol * (1L / 17.4mol) = 3.16x10⁻³L =
3.16mL of glacial acetic acid must be added
Hello, I am in a rush because this is due tomorrow and I would really really appreciate it if you guys can help me and answer one of the boxes, (it counts for marks) I hope you guys can help:)
Answer:
1. Yes, no, no
2. No, yes, no
3. Yes, Yes, No
Explanation:
Three states of matter exist – solid, liquid, and gas. Solids have a definite shape and volume. Liquids have a definite volume, but take the shape of the container. Gases have no definite shape or volume.
Answer:
Explanation:
Ok so for the first row I believe is Yes, No, No
Second row No, yes, No
last row i dont know
I hope this helped
(p.s I have't done this in a couple of months so it might be wrong and i am so sorry if it is.)
This molecule can be synthesized from an alkyne anion and an alkyl bromide. However, there are two ways in which this molecule can be formed. One way uses a higher molecular weight alkyne anion (Part 1) and the other uses a lower molecular weight anion (Part 2). Draw the two versions in the boxes below. Omit spectator ions.
For Part 1: Draw the reactants (i.e., alkyne anion and alkyl bromide) needed for the pathway that uses a higher molecular weight alkyne anion:
For Part 2: Draw the reactants (i.e., alkyne anion and alkyl bromide) needed for the pathway that uses a lower molecular weight alkyne anion:
Answer:
See explanation below
Explanation:
First of all, we need to know the molecule that need to be synthesized. In the first picture attached, we have the molecule.
Now, according to that, the molecule can be formed in two ways. Both ways are rather different but we have one thing in common in both ways, and it's the fact that both ways requires the reaction with an alkyne. In one way, with the higher MW and the other with the lowest.
For the first way, when we need to use the higher MW, all we need to do is to put the triple bond in the highest molecule, in this case, a molecule that include the benzene ring, and the other reactant will be the alkyl bromide. You can see the picture of this product below, (Picture 2).
For the second way, the triple bond should be located in the lowest MW, in this case an ethyl group, instead of the benzene ring, and the molecule with the benzene ring would have the bromide. In both cases we will have the same product. See picture 2 for this.
Hope this helps
write all reaction of phenols in the following
Answer:
Hope this is what you were looking for.
Phenol reacts with dilute nitric acid at room temperature to give a mixture of 2-nitrophenol and 4-nitrophenol while with concentrated nitric acid, more nitro groups get substituted on the ring to give 2,4,6-trinitrophenol which is known as picric acid.
What is the number of neurons in silicon
Answer:
14
Explanation:
i just know lol
........
Name this molecule c4h7bro
Answer:
I believe its : "2-Bromobutanal"
atch the following aqueous solutions with the appropriate letter from the column on the right. fill in the blank 1 A 1. 0.20 m NiSO4 A. Highest boiling point fill in the blank 2 B 2. 0.19 m NH4I B. Second highest boiling point fill in the blank 3 C 3. 0.17 m NH4NO3 C. Third highest boiling point fill in the blank 4 D 4. 0.43 m Urea(nonelectrolyte) D. Lowest boiling point
Answer:
Highest boiling point - 0.43 m Urea
Second highest boiling point - 0.20 m NiSO4
Third highest boiling point - 0.19 m NH4I
Lowest boiling point - 0.17 m NH4NO3
Explanation:
We know that;
ΔT = kb m i
Where;
ΔT = boiling point elevation
kb = boiling point constant
m = molality of the solution
i = Van't Hoff factor
For NiSO4 , NH4I and NH4NO3 , the Van't Hoff factor, i = 2
But for Urea, the Van't Hoff factor, i = 1
We also have to consider both the values of the molality and Van't Hoff factor , knowing that a higher molality and a higher Van't Hoff factor leads to a higher ΔT and consequently a higher boiling point.
This facts above account for the arrangement of substances shown in the answer.
What is the value for the rate of constant, k(with units)?
Answer:
b
Explanation:
HELP!
Which of the following fossils is an example of permineralization?
Answer:
Examples of permineralization
Most dinosaur bones are permineralized. Petrified wood: Permineralization is the first step in petrification.
Answer: you didn’t put any picture of any answers to pick but example of permineralization fossils would be dinosaur remains and wood
Lysosomes are important for
digestion
cell division
reproduction
protein synthesis
Answer:
i just took the test its digestion
Explanation:
can someone help me with number 2
Answer: Goldfish. :p
Explanation:
which atom has the largest number of neutrons
I need help please on chemistry
why
do real gases
divrate from the
Ideal
gas
law
The surface temperature of a star can be estimated based on the stars
When you need to produce a variety of diluted solutions of a solute, you can dilute a series of stock solutions. A stock solution has a significantly higher concentration of the given solute (typically 101 to 104 times higher than those of the diluted solutions). The high concentration allows many diluted solutions to be prepared using minimal amounts of the stock solution. What volume of a 6.57 M stock solution do you need to prepare 500. mL of a 0.0490 M solution of HCl
Answer:
3.73 mL
Explanation:
To solve this problem we can use the equation C₁V₁=C₂V₂, where:
C₁ = 6.57 MV₁ = ?C₂ = 0.0490 MV₂ = 500 mLWe input the data:
6.57 M * V₁ = 0.0490 M * 500 mLAnd solve for V₁:
V₁ = 3.73 mLSo 3.73 mL of a 6.57 M stock solution would be required to prepare 500 mL of a 0.0490 M solution.
Y’all I need help I will give brainly!!! (Use the crisscross method to find the chemical formula for the ionic compound formed by magnesium “Mg” and phosphorus “p”)
A) Mg2P
B) Mg3P2
C) MgP
D) Mg2P3
Answer:
B
Explanation:
The chemical formula will be Mg[tex]_3[/tex]P[tex]_2[/tex]. Therefore, the correct option is option B among all the given options.
What is chemical formula?Using atomic symbols with numerical subscripts, a chemical equation is indeed a notation used by chemists to indicate the total amount and kind of atoms contained in some kind of a molecule. A written chemical equation is a straightforward illustration of an actual, three-dimensional molecule.
The precise atoms that make up a material are described in its chemical formula. The chemical equation, the molecular formula, as well as the structural formula are the three fundamental types of chemical formulas. The chemical formula will be Mg[tex]_3[/tex]P[tex]_2[/tex].
Therefore, the correct option is option B.
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Radioactivity is a random Process, Why?
Explanation:
Radioactive decay is the set of various processes by which unstable atomic nuclei (nuclides) emit subatomic particles (radiation). Decay is said to occur in the parent nucleus and produces a daughter nucleus. This is a random process, i.e. it is impossible to predict the decay of individual atoms.
HOPE THSI HELPS HAVE A NICE DAY!
The scientific method
A.is a recipe for doing science
B.will always give the right answer
C.is a systematic approach to the study of phenomena
D.involves preconceived ideas
Answer:
A. Is a recipe for soing science
Explanation:
A scientific method is a procedure for conducting science experiments, its almost like a recipe for a science experiment.
1. A globe is what kind of model?
interactive
mathematical
conceptual
visualization
Answer:
It's visualization.
Explanation:
Hope this helps :)
If 4.50 moles of HNO3 are used, how many moles of copper (II) nitrate are produced?
Answer:
2.25 moles of Cu(NO₃)₂.
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
Cu + 2HNO₃ —> Cu(NO₃)₂ + H₂
From the balanced equation above,
2 moles of HNO₃ reacted to produce 1 mole of Cu(NO₃)₂.
Finally, we shall determine the number of mole of Cu(NO₃)₂ produced by the reaction of 4.5 moles of HNO₃. This can be obtained as follow:
From the balanced equation above,
2 moles of HNO₃ reacted to produce 1 mole of Cu(NO₃)₂.
Therefore, 4.5 moles of HNO₃ will react to produce = 2.25 moles of Cu(NO₃)₂.
Thus, 2.25 moles of Cu(NO₃)₂ were obtained from the reaction.
what is the major use of carbon monoxide
Answer:
Carbon monoxide is a very important industrial compound. In the form of producer gas or water gas.
hope ths help and if you want more information go to this website: science.jrank.org
Organisms that eat other organisms or dead organic matter are known as ___________________.
Group of answer choices
producers
autotrophs
heterotrophs
eukaryotes
Answer:
the answer is heterotrophs
Name each of the following species for the following acid-base reactions. (The equilibrium lies to the right in each case, i.e., the product side is favored. If the species is an ion, include the word "ion" in the name. Use systematic names such as "methanol" instead of archaic names like "methyl alcohol" or "wood alcohol".)
(a) H3O+ (hydronium ion) + CH3O- (methoxide ion) <--> *reverse reaction arrow*
acid:?
base:?
conjugate acid:?
conjugate base:?
(b) CH3CH2O- (ethoxide ion) + HCl (hydrogen chloride) <--> *reverse reaction arrow*
acid:?
base:?
conjugate acid:?
conjugate base:?
(c) NH2- (amide ion) + CH3OH (methanol) <--> *reverse reaction arrow*
acid:?
base:?
conjugate acid:?
conjugate base:?
Answer: a) [tex]H_3O^++CH_3O^-\rightleftharpoons CH_3OH+H_2O[/tex]
acid : hydronium ion
base : methoxide ion
conjugate acid : methanol
conjugate base: water
b) [tex]CH_3CH_2O^-+HCl\rightleftharpoons CH_3CH_2OH+Cl^-[/tex]
acid : hydrogen chloride
base : ethoxide ion
conjugate acid : ethanol
conjugate base: chloride ion
c) [tex]NH_2^-+CH_3OH\rightleftharpoons NH_3+CH_3O^-[/tex]
acid : methanol
base : amide ion
conjugate acid : ammonia
conjugate base: methoxide ion
Explanation:
According to the Bronsted-Lowry conjugate acid-base theory, an acid is defined as a substance which looses donates protons and thus forming conjugate base and a base is defined as a substance which accepts protons and thus forming conjugate acid.
The species accepting a proton is considered as a base and after accepting a proton, it forms a conjugate acid.
The species losing a proton is considered as an acid and after loosing a proton, it forms a conjugate base
For the given chemical equation:
a) [tex]H_3O^++CH_3O^-\rightleftharpoons CH_3OH+H_2O[/tex]
acid : hydronium ion
base : methoxide ion
conjugate acid : methanol
conjugate base: water
b) [tex]CH_3CH_2O^-+HCl\rightleftharpoons CH_3CH_2OH+Cl^-[/tex]
acid : hydrogen chloride
base : ethoxide ion
conjugate acid : ethanol
conjugate base: chloride ion
c) [tex]NH_2^-+CH_3OH\rightleftharpoons NH_3+CH_3O^-[/tex]
acid : methanol
base : amide ion
conjugate acid : ammonia
conjugate base: methoxide ion
.
What is the mass of an object if its potential energy is 800 J and it is 2.0 m above the ground?
Answer:
potential energy = mgh put values and get your answer
Draw the Zaitsev product formed when 2,3‑dimethylpentan‑3‑ol undergoes an E1 dehydration. The starting material is a chiral carbon with an in plane bond pointing up to methyl and an in plane bond to O H pointing to the lower right. There is a wedged bond to isopropyl pointing to the lower left and a dashed bond to ethyl pointing to the left. This reacts with H 3 P O 4 in an E 1 reaction to give the Zaitsev product.
Answer:
See explanation
Explanation:
Dehydration of an alcohol by E1 mechanism occurs in two steps. The first step is the is the protonation of the -OH group in the alcohol followed by the elimination of water, a good leaving group.
In the case of 2,3‑dimethylpentan‑3‑ol, the carbocation formed undergoes rearrangement followed by loss of a hydrogen atom. This now yields the product as shown in the image attached.
Note that, the Zaitsev's product is the most substituted product and is most stable hence it is the most favored product.
hydroxide, express your answer in a chemical formula
Answer:
OH⁻
Explanation:
Hydroxide is represented as OH⁻, since it is specifically the oxygen atomic that is specifically connected to a central metal ion of Fe, never hydrogen, which means that it could be represented as OH⁻.
OH⁻ is the chemical formula for hydroxide, since it is specifically the oxygen atomic that is specifically connected to a central metal ion of Fe, never hydrogen, which means that it could be represented as OH⁻.
A chemical formula is a way to describe the chemical ratios of the atoms that make up a specific chemical compound or molecule in chemistry. Chemical element numbers, symbols, and on occasion other symbols, including parentheses, dashes, brackets, commas, and plus (+) and minus () signs, are used to represent the chemical elements. Which may also include subscripts or superscripts. Since a chemical formula inherently wordless, it cannot be considered a chemical name. A chemical formula does not equal a complete chemical structural formula, despite the fact that it may suggest certain basic chemical structures. Hydroxide is represented as OH⁻.
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Look at this data and calculate the mean, median, mode, and range.
5, 9, 10, 15, 14, 9, 14, 12, 20, 14, 20
mode
range
median
mean (to the nearest whole number)
Answer:
the median is 14 the range is 15 the mode is 14 and the mean is 12.7
Explanation:
for the median you put all numbers is order but least to greatest and figure out the middle number for range you take the smallest and the biggest number and subtract them for mode you use the most repeated number and for the mean you add all the numbers and divide by the total of numbers I hope this helped
One mole (mol) of ethanol (C2H60) has a mass of 46.0684 g.
What is the mass of 2.1 mol of ethanol in kilograms?
Need to see how the calculation was done
Answer:
0.0967kg
Explanation:
1 mol = 46.0684 g
2.1 mol = 46.0684 × 2.1 = 96.74364 g
1000 g = 1 kg
96.74364 g = 96.74364/1000 = 0.0967kg
What is the mass of 2.15X10^ 24 molecules of CO2?
Answer:
Mass of CO2 = ? Thus, the mass of 2.2x10^9 molecules of CO2 is 9.68 x 10^10 grams.
Explanation: