Answer:
pH = 12.08.
Explanation:
Write the base reaction of methylamine:
[tex]\displaystyle \text{H$_2$O}_\text{($\ell$)} + \text{CH$_3$NH$_2$}_\text{(aq)} \rightleftharpoons \text{CH$_3$NH$_3$}^+_\text{ (aq)} + \text{OH}^-_\text{ (aq)}[/tex]
The equilibrium constant expression will hence be:
[tex]\displaystyle K_b = \frac{\left[\text{CH$_3$NH$_3$}^+\right]\left[\text{OH}^-\right]}{\left[\text{CH$_3$NH$_2$}\right]}[/tex]
As the reaction proceeds, x amounts of CH₃NH₃⁺ and OH⁻ will be formed and (0.35 M - x) amounts of CH₃NH₂ remains.
Assuming that the change to CH₃NH₂ is negligible, we have that:
[tex]\displaystyle \begin{aligned} K_b & = \frac{(x)(x)}{(0.35 -x)} \\ \\ (4.4\times 10^{-4}) & \approx \frac{x^2}{0.35} \\ \\ x & =0.012 \end{aligned}[/tex]
Hence, [OH⁻] = 0.012 M.
Find [H⁺]:
[tex]\displaystyle \begin{aligned} \ [\text{H}^+][\text{OH}^-] & = 1.0\times 10^{-14} \\ \\ [\text{H}^+] (0.012) & = 1.0\times 10^{-14} \\ \\ [\text{H}^+] & = 8.3\times 10^{-13} \text{ M}\end{aligned}[/tex]
Hence, the pH is:
[tex]\displaystyle \begin{aligned} \text{pH} & = -\log [\text{H}^+] \\ \\ & = -\log (8.3\times 10^{-13}) \\ \\ & = 12.08\end{aligned}[/tex]
In conclusion, the pH is about 12.08.
Write a few sentences about respiration in your own words
Answer:
Is production of energy
NEED ANSWER ASAP WILL MARK BRAINLIEST
The HR diagram includes data on many common stars that can be found in the night sky. Based on the data in the diagram, what is the relationship between temperature and absolute brightness in the main sequence stars?
As the star's temperature increases, absolute brightness will be unpredictable.
As the star's temperature increases, absolute brightness will stay the same.
As the star's temperature increases, the absolute brightness will decrease
As the star's temperature increases, the absolute brightness will increase.
Answer:
The higher the temperature, the brighter the star.
Explanation:
Convection creates circulating current in a pot of boiling water because _____ water rises and ____ water sinks
The answer should be 'hotter' and 'cooler'
The hot water molecules would become less dense and thus rise above the denser cooler molecules.
Hope that helps!
What is the best definition
of thermal expansion?
A. Thermal expansion is when an object's volume
increases due to heat increase.
B. Thermal expansion is when an object's volume
decreases due to heat increase.
C. Thermal expansion is when an object's volume stays the
same due to heat increase.
Answer:
B.
Explanation:
thermal expansion♡
answer:
I think is B. Thermal expansion is when an object's volume
decreases due to heat increase.
Which of the following statements correctly explains why we experience seasons?
(13 Points)
A. As the Earth moves away from the Sun, we change from summer to fall to winter. As the Earth moves closer to the Sun, we change from winter to spring to summer.
B. As the Earth spins on its axis, we experience seasons. Each 1/4 spin of the Earth on its axis represents a change in season.
C. Earth's tilt on its axis means one hemisphere leans toward the Sun, causing it to experience warmer temperatures. As Earth revolves around the Sun, a different hemisphere leans toward the Sun, causes warmer temperatures in that hemisphere.
D. The Moon moving in front of the Sun causes temperatures on Earth to drop, which causes winter. When it moves behind the Sun, a rise in temperature causes summer.
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Some of the physical characteristics of the planets in the Solar System are shown below. The distance of each planet from the Sun is given in astronomical units (AU).
PHYSICAL DATA OF PLANETS
Planet Distance from the Sun (AU) Mass (kilograms) Mean Orbital Speed (kilometers/second)
Mercury 0.38 3.33 x 1023 47.87
Venus 0.72 4.87 x 1024 35.02
Earth 1.0 5.97 x 1024 29.78
Mars 1.5 6.47 x 1023 24.13
Jupiter 5.2 1.90 x 1027 13.07
Saturn 9.5 5.68 x 1026 9.69
Uranus 19.2 8.68 x 1025 6.81
Neptune 30.1 1.02 x 1026 5.43
Which conclusion can most accurately be drawn from this information?
Name the chemical used in fire extinguisher
The most common chemical is Sodium Bicarbonate used in the fire extinguisher, But today, Potassium Bicarbonate is widely used in fire extinguishers due to its effectiveness as compared to Sodium Bicarbonate.
What is the boiling point of a solution of ethanol (C2H5OH) and sugar (C12H22O11) that contains 20.00 g of the sugar in 250.0 g of the ethanol
The boiling point elevation is a colligative property. From the calculations, the boiling point of the ethanol - sugar solution is 78.65°C.
What are colligative properties?The term colligative properties refers to those properties that depend on the number of solute particles present.
Number of moles of sugar = 20 g/342.3 g/mol = 0.058 moles
Boiling constant of ethanol = 1.22 °C⋅kg/mol
Molality of the solution = 0.058 moles/250 * 10^-3 = 0.232 m
Since sugar is a molecular substance, the Van't Hoff factor is 1
The normal boiling point of pure ethanol is 78.37 °C
ΔT = K m i
ΔT = 1.22 °C⋅kg/mol * 0.232 m * 1
ΔT = 0.28°C
Boiling point of solution = 78.37 °C + 0.28°C = 78.65°C
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Which pair of elements has reactivity that is similar to chlorine, cl?.
Answer:
Both chlorine and bromine lies in the same group therefore they have similar properties.
Two or more than two atoms with different physical or chemical properties can not combine together to form an element. Fluorine, bromine and iodine will have same properties in terms of reactivity.
What is element?Element generally consist of atoms or we can atoms combine to form element. Atoms of an element is always same, means all the properties of all atoms of one type of element is same.
The elements belonging to same group have same period. Chlorine belongs to group 17 that is to the halogen family. The elements that are in the same group of chlorine are Fluorine, bromine and iodine. Since these elements contains same number of electrons that is 7 in its outermost shell, behave equally in terms of reactivity.
Therefore, fluorine, bromine and iodine will have same properties in terms of reactivity.
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How many sigma bonds are present in acetylsalicylic acid.
Answer:13
Explanation:”13 sigma bonds”
According to Avogadro's law, what do equal volumes of ideal gases at
the same temperature and pressure contain?
Answer:
contain an equal number of molecules
Answer: equal volumes of different gases contain an equal number of molecules.
Explanation:
Match the scientist with their achievement:
Answer:
Frederich Miescher- first person to isolate DNA and RNA
Frederick Griffith- first to demonstrate horizontal transmission of dna using bacteria
Gregor Mendel- documented and demonstrated inheritance patterns
Thomas Hunt Morgan- identified chromosomes as the structures responsible for inheritance
Joachim Hammerling- demonstrated that the hereditary information of of eukaryotes is contained within the nucleus
Alfred Hershey and Martha Chase- demonstrated that dna not protein was the molecule responsible for hereditary
George Beadle and Edward Tatum- used mutants to show the relationship between DNA and proteins
Albrecht Kossel- characterized the structure of adenine, guanine, cytosine, thymine, and uracil
Explanation:
Hope this helps! Pls give brainliest!
Match the scientist with their achievement:
Albrecht Kossel: Characterized the structure of adenine, guanine, cytosine, thymine, and uracilFriedrich Miescher: First person to isolate DNA and RNAGregor Mendel: Documented and demonstrated inheritance patternsThomas Hunt Morgan: Used mutants to show the relationship between DNA and proteinsJoachim Hammerling: Demonstrated that the hereditary information of eukaryotes is contained within the nucleusGeorge Beadle and Edward Tatum: Demonstrated that DNA, not protein, was the molecule responsible for heredityFrederick Griffith: First to demonstrate horizontal transmission of DNA using bacteriaAlfred Hershey and Martha Chase: Identified chromosomes as the structures responsible for inheritanceLean more about Scientist, here:
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what's the gravity and motion
Answer:
Gravity : Gravity is the force acting on objects that pulls it to the crust of the earth. It is the universal force of attraction between all matter.
Motion: Motion is the movement of objects from one position to another.
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Terylene is a popular form of
A. Polyester
B. Monomer
C. Plastic
D. Nylon
Answer:
Polyester
Explanation:
Terylene is popular form of polyesterIt is made by the mixing ethylene glycol and terephthalic acid with the elimination of waterBalance the chemical equation below using the smallest possible whole number stoichiometric coefficients. Br2(l) + I2 (s) --> IBr3(g)
Answer:
3 Br₂(l) + I₂ (s) --> 2 IBr₃ (g)
Explanation:
After multiplying the coefficients and the subscripts, this would leave you with:
Reactants: 6 Br and 2 I
Products: 6 Br and 2 I
These are the lowest possible coefficients because you cannot further divide the coefficients and still get a whole number.
The trait for rabbit fur follows an inheritance pattern of incomplete dominance. If a rabbit with short fur and a rabbit with long fur mate, what length fur will the offspring have?
Answer:
medium length fur
Explanation:
incomplete dominance is when the two traits kind of combine. u would have to make a punnet square, but in short, 100% of the offspring would have medium length fur
Which of the following is correctly balanced?
A.
Na2S + HCl → 2NaCl + 2H2S
B.
Na2S + 2HCl → NaCl + 2H2S
C.
Na2S + 2HCl → 2NaCl + H2S
D.
Na2S + HCl → NaCl + H2S
Answer:
A.) Na2S + HCl → 2NaCl + 2H2S
Explanation:
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Which effect is one likely result of a forest fire? extinction adaptation speciation forced migration
Forced migration effect is one likely result of a forest fire condition.
What is migration?Migration is a process in which group of species like birds, animals or any living organism will go from one place to other place.
When in the forest if fire is placed then in this condition, living organism of forests such as birds, insects, animals and mammals will go to other place without their willingness. This type of migration is known as forced migration.
Hence, option (d) is correct i.e. forced migration.
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Answer:
forced migration
Explanation:
Organisms will be forced to move from their natural habitat if a forest fire takes place. This is because they will have to move from their devastating habitat to an area that is less threatening and safer for survival.
Therefore, the answer is forced migration.
CLAIM:Pennies are not all copper.
EVIDENCE:The density of copper bar is 8.4 g/cm^3, while the pennies have a density of 6.9 g/mL.
Reason:If the density of the pennies are not the same as the copper bar. The pennies can't be pure copper.
My teacher wants me to find out why pennies are not all copper.
Answer:
Explanation:
Mint produced more than 130 billion pennies. Then, in 1982 the Mint introduced a penny that is 97.6 percent zinc and only 2.4 percent copper with a density of 7.2 g/mL. By comparison, the old pre-1982 copper pennies were 95 percent copper and 5 percent zinc with a density of 8.8 g/mL.
3. What is the total number of N, atoms in 56.0 grams of nitrogen gas at STP?
And: 89.53L
Explanation:
if u can't see the pic I'm sorry and ik my handwriting is sloppy. (I'm working on it) :)
A proton and an electron are near each other. What way does their electric force point?
A. No force between them
B. Repulsive
C. Outward
D. Attractive
Answer:
D
Explanation:
proton is positive while electron is negative so they will attract
The attractive force will be there if a proton and an electron are near each other. Hence, option D is correct.
What is an attractive force?The force by which one object attracts another.
Proton is positive while electron is negative so they will attract.
Hence, the attractive force will be there if a proton and an electron are near each other.
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Aluminum carbide powder decomposes in water:
Al4C3 (s) + 12 H2O (l) → 4 Al(OH)3 (aq) + 3 CH4 (g)
Which of the following pairs of quantities represent the correct stoichiometric amounts for this reaction?
a.
1 mol Al4C3 and 1 mol H2O
b.
4 mol Al4C3 and 24 mol H2O
c.
7.2 g Al4C3 and 1.8 g H2O
d.
1 moles Al4C3 and 12 moles H2O
Answer:
d. 1 mole Al₄C₃ and 12 moles H₂O
Explanation:
The coefficients in a balanced chemical equation indicate the number of moles of reactants and products. If a substance does not have a coefficient written in front of it, it is assumed to be 1.
1. Calculate the mass of oxygen required to react with 10.0 grams of iron. 4Fe + 302 → 2Fe20;3
Answer:
2.14g of oxygen
Explanation:
10g x 1mol/55.85mol x 3mol (o)/ 4mol (Fe) x 16g = 2.14g
Explain what happens to the particles in a substance during a physical change.
Answer:
The particals in a physical change alwayd stay the same, but for a chemical change that is the only time they will change. Not during a physical change
Explanation:
what reactions happen when you put sodium in water?
A canister of neon contains 4. 8x10^24 atoms of the gas. How many moles of neon are present in the canister?
Answer:
13.28 moles
Explanation:
A mole is avogadro's number of atoms, or 6.022*10^23 atoms. You just have to divide the amount of atoms by avogadro's number to get the amount of moles. (8*10^24)/(6.022*10^23)=13.28 moles of neon
Is it illegal to purchase chloroform in the United States? If so why?
Answer:
no
Explanation:
no its not legal to purchase it
What are the products in the reaction below? (select all that apply)
Answer:
6CO₂ + 6H₂O
Explanation:
The products are on the right hand side of the equation which include Carbon dioxide and water
LGBTQ
any friends out there for me?
Answer:
ill be your friend
Explanation:
im apart of the lgbtq+ community im bi
Answer:
Sure! I'm born female and I'm pan
Explanation:
The Young's modulus values for iron and lead are 210 GPa and 16 GPa, respectively. Based on the information, which statement is true for the two
metals?
A. Lead is more ductile than iron.
B. Iron is more ductile than lead.
C. Iron is softer than lead.
D. Lead is a better conductor than iron.
Lead is more ductile than iron. The correct option is A. Lead is more ductile than iron
Young's modulusFrom the question, we are to determine the statement which is true
First, we will define the term Young's modulus
Young's modulus is a measure of the stiffness of an elastic material. It is also given as the ratio of stress to strain. That is,
[tex]Young's\ modulus = \frac{Tensile\ stress}{Tensile\ strain}[/tex]
The greater the modulus, the stiffer the material.
Materials with low Young's modulus tend to be ductile and materials with high Young's modulus tend to be brittle
Since the Young's modulus value for iron is higher than that of lead, then iron is stiffer than lead.
Thus, lead is more ductile than iron. The correct option is A. Lead is more ductile than iron
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