Answer:
The pH of the buffer is 7.0 and this pH is not useful to pH 7.0
Explanation:
The pH of a buffer is obtained by using H-H equation:
pH = pKa + log [A⁻] / [HA]
Where pH is the pH of the buffer
The pKa of acetic acid is 4.74.
[A⁻] could be taken as moles of sodium acetate (14.59g * (1mol / 82g) = 0.1779 moles
[HA] are the moles of acetic acid (0.060g * (1mol / 60g) = 0.001moles
Replacing:
pH = 4.74 + log [0.1779mol] / [0.001mol]
pH = 6.99 ≈ 7.0
The pH of the buffer is 7.0
But the buffer is not useful to pH = 7.0 because a buffer works between pKa±1 (For acetic acid: 3.74 - 5.74). As pH 7.0 is out of this interval,
this pH is not useful to pH 7.0
Which phrase defines altitude?
how tightly molecules are packed
a column of air pushing on an area
the force pushing on an area or a surface
the height of a given point above sea level
Calcule la formula empírica de la sustancia está compuesta por 18,4% de carbono 21,5% de nitrógeno y 60,1% de potasio
Answer:
La fórmula empírica es C₂N₂K₅
Explanation:
La fórmula empírica es la expresión más sencilla para representar un compuesto químico e indica los elementos que están presentes y la proporción mínima en números enteros que hay entre sus átomos. A esta fórmula se le conoce también como “fórmula mínima” .
En otras palabras, la fórmula empírica muestra la proporción entre los átomos de un compuesto químico.
Si supones que tenes 100 gramos del compuesto, los porcentajes en masa indicarán los gramos de cada elemento en esos 100 gramos. Si la sustancia está compuesta por 18,4% de carbono, 21,5% de nitrógeno y 60,1% de potasio, entonce habrá 18,4 g de carbono, 21,5 g de nitrógeno y 60,1 g de potasio
Para la obtención de la fórmula empírica entonces, teniendo en cuenta la masa molecular de cada sustancia, en primer lugar se calcula el número de moles relativos de cada elemento químico:
C: 18.4 g/12 g/mol = 1.5 moles
N: 21.5 g/14 g/mol = 1.5 moles
K: 60.1 g/16 g/mol = 3.75 moles
De esta manera hallas la relación entre el número de moles de los distintos elementos, pero no estará expresada en forma de números enteros y sencillos. Para expresar la relación anterior en forma de números enteros y sencillos, divides el número de moles de cada elemento entre el número de moles menor de todos ellos.
C = 1.5 moles/ 1.5 moles = 1
N = 1.5 moles/ 1.5 moles = 1
K = 3.75 moles/ 1.5 moles = 2.5
Si no se obtiene una relación de números enteros, debes multiplicar por un número sencillo para conseguirlo. En este caso, multiplicando por dos obtienes:
C= 2
N= 2
K= 5
La fórmula empírica es C₂N₂K₅
The empirical formula of the compound will be CNK
To get the empirical formula of the compound, we will follow the steps below;
Divide the mass of the elements by the molar mass to get the moles of each element;
For Carbon: 18.4/12 = 1.5 molesFor Nitrogen: 21.5/14 = 1.5 molesFor Potassium: 60.1/39 = 1.5 molesDivide through by the smallest ratio to get the ratio of each element present in the compound
For Carbon: 1.5 moles/1.5 = 1For Nitrogen: 1.5 moles/1.5 = 1For Potassium: 1.5moles/1.5 = 1The empirical formula of the compound will be CNK
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Cuando haces ejercicios abdominales estas realizando un trabajo. Si haces el mismo numero de abdominales en la mitad de tiempo que acostumbras, ¿como seria tu rendimiento en terminos de potencia comparandolo con el tiempo normal en que las haces?
Answer:
El rendimiento seria mayor ya que la potencia aumenta.
Explanation:
La potencia aumenta cuando determinado trabajo se realiza en menor cantidad de tiempo.
How do astronomers observe and learn about celestial
objects?
Answer:
Astronomers use a number of telescopes sensitive to different parts of the electromagnetic spectrum to study objects in space. Even though all light is fundamentally the same thing, the way that astronomers observe light depends on the portion of the spectrum they wish to study.
Explanation:
How does the digestive system work with the muscular system?
A: Digestive System gets nutrients (good) from food and hands it over to the blood and Circulatory System then carries those
nutrients where they need to go.
B: It doesn't
C: The enteric nervous system's network of nerves, neurons and neurotransmitters extends along the entire digestive tract - from
the esophagus, through the stomach and intestines, and down to the anus.
D: The muscular system allows for movement within the body, for example, during digestion or urination.
Answer:
the answer is not d because you can pee without moving. so its a because without the food nutrient no part of our body can work
Plzzzz helppp this submits in 5 minutes plzzzzz helpppp meeeee
List five predictions of climate change and the effects on earth by the year 2100
Answer:
Predictions:
1. Half of the world will be cold and the other half will be hot, which will cause unbalanced state of climate on Earth.
2. The whole world will start to get hotter and there will be no winters or rain which causes water shortage, unable to grow crops. Polar ice is melting is an example.
3. Floods can come, because water level in sea is rising and it could kill all of us.
4. Earthquake can occur because in the Bible Jesus tells about earthquakes, etc at the second coming of Jesus.
Explanation:
A ninja motorbike travelling at 55 m/s takes 10 sec to come to rest . What is its deceleration rate ?
Answer:
Speed=Distance
Time
Explanation:
This is due today and I’m so confused, if you know any of the answers, please help me out. Thank you!
Burning match in physical or chemical change and why
Answer:
Answer is on the pic
Explanation:
I hope it's helpful!
Please Help
All matter has physical and chemical properties. These properties can be used to identify the type of matter. Which of these statements describes a chemical property?
Select one:
a. A metal is added to a beaker of water, a gas is formed, and the beaker explodes.
b. A certain heavy metal turns to a liquid at room temperature.
c. A 2-feet-long metal bar has a mass of only 176 g.
d. A particular substance evaporates at 30 °C.
How does the moon's physical characteristics make it easier for scientists to study than the sun?
Responses
A. The moon is closer to Earth so it is easier to see and visit.
B. The moon is solid so it is easier for astronauts to visit.
C. The moon is not as bright as the sun so it is easier to view through a telescope.
D. All of the other answer choices
2.Earth completes one rotation every 24 hours. The moon completes one rotation about every 28 days. How are the day/night cycles different on the moon and on Earth?
Responses
A. The moon's day/night cycle takes 28 days instead of 24 hours.
B. On the moon, it is always daytime.
C. On the moon, it is always nighttime.
D. The moon has a week/month cycle instead of a day/night cycle.
Scientists noticed that climate changes on Earth cycled through about every 11 years. The scientists realized the changes were affected by the sun. Which feature of the sun causes these Earth climate changes?
Responses
A. None of the other answer choices
B. Solar flares
C. The corona
D. Sunspots
Answer:
1st question: The moon is closer to Earth so it is easier to see and visit.
2nd question: The moon has a week/month cycle instead of a day/night cycle.
3rd question: The corona
Explanation:
can some give 2 paragraph about science
Answer:
Explanation:Science is the scholarly and down to earth movement, including the efficient investigation of the structure and the laws of nature with intensive trial and pragmatic perception. Science is isolated into three branches: Natural sciences, Social sciences, formal sciences.
Science offers new information and revelations of many things we do not know. Day by day, science is progressing. Now science has helped man reach the moon, which was once unknown to man as a satellite. Every invention in technology or medical techniques is based on science and scientific research
An advantage of using renewable energies is? 1.They are harmful to the environment 2.We have a limited supply of them 3.They allow us to take energy from natural processes
Answer:
3. They allow us to take energy from natural processes
Explanation:
There are two major sources of energy namely: renewable and non-renewable. Renewable sources of energy are those natural sources that gets replenished faster than they are utilized, which is contrary to non-renewable sources. Examples of renewable sources of energy are wind energy, solar energy, hydro (water) energy.
According to the question, one advantage or merit that renewable sources have over their counterparts is that they allow us to take energy from natural processes e.g. wind, sunlight etc.
Can someone answer this asap!! All I know is 188g is incorrect!
Answer:
db gb bg
Explanation:
What is the molarity of a solution that
contains 20.0 g of KOH dissolved in 1.25
L?
Answer:
0.40m
Explanation:
how does the chlorine atom attain a stable octet in each of the preceding cases
Answer:
where is the question i can't see it
Metal or Non-metal?
Potassium: metal
Fluorine:
Bromine:
Hydrogen
Beryllium:
Nitrogen
Answer:
Fluorine:non-metal
Bromine:non-metal
Hydrogen:non-metal
Beryllium:metal
Nitrogen:non-metal
Describe the sizes of the first 4 planets?
Answer:
Explanation:the answer
Answer:
Bro.
Mercury – 1,516mi (2,440km) radius; about 1/3 the size of Earth.
Venus – 3,760mi (6,052km) radius; only slightly smaller than Earth.
Earth – 3,959mi (6,371km) radius.
Mars – 2,106mi (3,390km) radius; about half the size of Earth.
Jupiter – 43,441mi (69,911km) radius; 11x Earth's size
Explanation:
what are the preparations of alcohols?
Answer:
Alcohols are prepared by SN2 reaction
Alkyl halides can be converted to alcohols by using SN2 reactions with OH- as a nucleophile. Substrates that undergo substitution by SN1 reaction can be converted to alcohols using water as the nucleophile (and it can even be the solvent).Explanation:
NaOH + HF --> NaF + H2O If you are given 3 moles of HF at the beginning of the reaction, how many moles of NaF will be produced?
Answer:
NaOH+HF-------NaF+H2O
1 mole Of HF=1mole of NaF
3mole HF= X
X=3mole of NaF
EZ POINTS PLEASE HELP
What particle decomposes to produce the electron of beta radiation? A. electron
b. proton
C. neutron
D positron
Answer:
D
Explanation:
Beta radiation is the emission of the high-energy positron by the beat decay of the atom. The positron decomposes to produce an electron of beta radiation. Thus, option D is correct.
What is beta radiation?Beta radiation is the high-energy formation of the positrons and electrons by the radioactive decay of the high-speed and energy particles emitted by the decay of the nucleus.
The positron is a positive charged sub-atomic particle with mass as same as the electron. It is produced after the beta decay and follows the formation of electrons.
The beta radiations are produced from the radioactive decay that leads to light and particle formation in the form of electrons and positrons.
Therefore, option D. positrons are produced as a result of beta radiation.
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Which has more mass, one mole of carbon (C) or one mole of copper (Cu)?
Explain.
The mass ratio of H:S:O in sulfuric acid today is 1:8:32. Predict the mass ratio of sulfuric acid in 23th century.
In the 23rd century, the mass ratio of H:S:O in sulfuric acid will remain 1:8:32.
Law of definite proportionsWe know from the law of definite proportions that irrespective of the path through which a chemical compound is obtained, it has a fixed composition by mass.
As such, the composition of a chemical substance does not vary. Therefore, in the 23rd century, the mass ratio of H:S:O in sulfuric acid will remain 1:8:32.
Learn more about law of definite proportions:https://brainly.com/question/13204929
3. Which of the following represents a covalent compound?
a. 02
b. CO2
C. Cl2
d. Naci
For the Question "Which of the following represents a covalent compound?" we have
CO_2Option BFrom the Question we are told
'3. c
Generally
a covalent compound is a kind of bond in which valence electrons are shared b/w the party atoms forming the bond
Therefore
We see covalent compound in CO_2 as they match perfectly the phenomenon that is covalent bonding
Therefore
For the Question "Which of the following represents a covalent compound?" we have
CO_2Option BFor more information on this visit
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If 0.150 moles of calcium oxide reacts with carbon dioxide gas, how many grams of calcium carbonate can be produced?
Answer:
15 g of CaCo₃
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
CaO + CO₂ —> CaCo₃
From the balanced equation above,
1 mole of CaO reacted to produce 1 mole of CaCo₃.
Next, we shall determine the number of mole of CaCo₃ produced by the reaction of 0.15 mole of CaO. This can be obtained as follow:
From the balanced equation above,
1 mole of CaO reacted to produce 1 mole of CaCo₃.
Therefore, 0.15 mole of CaO will also react to produce 0.15 mole of CaCo₃.
Finally, we shall determine the mass of 0.15 mole of CaCo₃. This can be obtained as follow:
Mole of CaCo₃ = 0.15 mole
Molar mass of CaCo₃ = 40 + 12 + (16×3)
= 40 + 12 + 48
= 100 g/mol
Mass of CaCo₃ =?
Mole = mass / Molar mass
0.15 = Mass of CaCo₃ / 100
Cross multiply
Mass of CaCo₃ = 0.15 × 100
Mass of CaCo₃ = 15 g
Thus, 15 g of CaCo₃ were obtained from the reaction.
The percentage of salicylic acid is 60.78% carbon 4.38% hydrogen and the rest is oxygen calculate the empress formula of salicylic acid
Answer: c2h2o
Explanation:
A sample of Ar(g) is contained in a
cylinder with a moveable piston at an initial
temperature of T. The volume of the
sample is decreased from 4.5 L to 1.5 L
while the pressure is held constant, as
shown in the diagram below.
Answer:
Option (B) is correct.
Explanation:
Initial temperature of the gas is T.
The volume of the sample is decreased from 4.5 L to 1.5 L while the pressure is held constant.
At constant pressure, the relation between volume and temperature is given by :
[tex]\dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}[/tex]
Here, V₁ = 4.5 L, V₂ = 1.5 L, T₁ = T₁, T₂ = ?
So,
[tex]T_2=\dfrac{V_2T_1}{V_1}\\\\T_2=\dfrac{1.5\times T_1}{4.5}\\\\T_2=\dfrac{T_1}{3}[/tex]
So, the final temperature of the gas is [tex]\dfrac{T_1}{3}[/tex]. Hence, the correct option is (B).
Metal or Non-metal?
Potassium: metal
Fluorine:
Bromine:
Hydrogen
Beryllium:
Nitrogen
Answer:
Fluorine: non-metal
Bromine: non-metal
Hydrogen: non-metal
Beryllium: metal
Nitrogen:non-metal
(Element or Compound)
C2H30
Answer:
Compound
Explanation:
An element is just like Carbon by itself but when theres more than one element it is a compound.
Answer:
C2H3O is a compound as it is formed when three elementscarbon, hydrogen, oxygen) react together
Describe the structure or shape of DNA
Answer:
a double helix structure
Explanation:
a two-stranded molecule that appears twisted, giving it a unique shape referred to most commonly as the double helix structure