I believe it is D because being resistant to diseases could have helped not spread diseases among one another and the babies would have had the same trait to keep them alive.
I hope this has helped
Body resistant to diseased caused by mosquito bites.
TOOK FLVS TEST AND GOT IT RIGHT
Questions 3-6 refer to rhe solutions below:
(A)100mL of 1.0 M CH3COOH mixed with 100mL of 1.0 M CH3COONa
(B)100mL of 1.0 M HBr mixed with 100mL of 1.0 M KBr
(C)100mL of 1.0 M HI mixed with 100mL of 1.0 M NaOH
(D)100mL of 1.0 M NH4Cl mixed with 100mL of 1.0 M NH3
(E)100mL of 1.0 M NaOH mixed with 100mL of 1.0 M CH3COOH
3.) Which solution will produce a buffer with a pH < 6.5
4.) Which solution will produce a buffer with a pH > 7.5
5.) which solutiom will have a pH of about 7
6.) which solution will be the most acidic
Under room temperature where [tex]\text{pK}_w = 14[/tex]:
3.) (A), (B), and (E).
4.) (D).
5.) (B).
ExplanationWhat makes a buffer solution? For a solution to be a buffer, it needs to contain large amounts of a weak acid and its conjugate base ion. Alternatively, the solution may contain large amounts of a weak base and its conjugate acid ion.
Not every one of the five solutions is a buffer solution.
(A)Ethanoic acid CH₃COOH (a.k.a. acetic acid) is a weak acid. pKa = 4.756. CH₃COONa is a salt. It dissolves to produce CH₃COO⁻, which is the conjugate base ion of CH₃COOH. The solution in (A) contains equal number of CH₃COOH and CH₃COO⁻, both at 1.0 M.
Refer to the Henderson-Hasselbalch equation for buffers of weak acids.
[tex]\displaystyle \text{pH} = \text{pK}_a + \log{\frac{[\text{Conjugate Ion}]}{[\text{Weak Acid}]}}[/tex].
[tex]\displaystyle \log{\frac{[\text{Conjugate Ion}]}{[\text{Weak Acid}]}} =\ln{1} = 0[/tex].
The pH of the solution in (A) will be the same as the pKa of CH₃COOH. pH = 4.746.
(B)Consider the hydrogen halides:
HF: weak acid.HCl: strong acid.HBr: strong acid.The radius of halogen atoms increases down the group, and hydrogen-halogen bond becomes weaker. It becomes easier for water to break those bonds. As a result, the strength of hydrogen halides increases down the group. HF is the only weak acid among the common hydrogen halides.
Mixing HBr and KBr at equal ratio will be similar to mixing HCl and KCl at the same ratio. All HBr in the solution breaks down into H⁺ and Br⁻. The pH of the solution will depend only on the concentration of HBr.
[tex]\displaystyle [\text{H}^{+}] = [\text{HBr}] \\\phantom{[\text{H}^{+}]}= \frac{n}{V} \\\phantom{[\text{H}^{+}]}= \frac{c(\text{HBr})\cdot V(\text{HBr})}{V(\text{HBr})+V(\text{KBr})}\\\phantom{[\text{H}^{+}]}=\frac{0.100\;\text{L}\times 1.0\;\text{mol}\cdot\text{L}^{-1}}{0.100\;\text{L}+0.100\;\text{L}} \\\phantom{[\text{H}^{+}]}= 0.50\;\text{mol}\cdot\text{L}^{-1}[/tex].
[tex]\text{pH} = -\log{[\text{H}^{+}] = -\log{0.50} \approx {\bf 0.30}[/tex].
(C)Similarly to HCl and HBr, HI is also a strong acid. Mixing HI and NaOH at equal ratio will produce a solution of NaI, which is similar to NaCl. The final solution will be neutral. pH = 7 if pKw = 14.
(D)NH₃ is a weak base. NH₄Cl dissolves completely to produce NH₄⁺ and Cl⁻. NH₄⁺ is the conjugate acid of NH₃. The final solution will contain an equal number of NH₃ and NH₄⁺. pKb = 4.75 for ammonia NH₃.
Apply the Henderson-Hasselbalch equation for buffers of weak bases:
[tex]\displaystyle \textbf{pOH} = \text{pK}_b + \log{\frac{[\text{Conjugate Ion}]}{[\text{Weak Base}]}}= 4.75 + \log{1} = 4.75[/tex].
Note that what this equation gives for buffers of weak bases is the pOH of the solution. pH = pKw - pOH. Assume that pKw = 14. pH = 14 - 4.75 = 9.25.
(E)The solution in (E) will contain about 1.0 M of CH₃COOH. The volume of the solution will be 200 mL.
[tex]n(\text{CH}_3\text{COO}^{-}) = n(\text{NaOH}] = c\cdot V = 0.10\;\text{mol}[/tex].
[tex]\displaystyle [\text{CH}_3\text{COO}^{-}] = \frac{n}{V} = {0.10}{0.10 + 0.10} = 0.50 \;\text{mol}\cdot\text{L}^{-1}[/tex].
There's nearly no conjugate base of CH₃COOH. As a result, the solution will not be a buffer, and the Henderson-Hasselbalch Equation will not apply. Refer to an ICE table:
[tex]\begin{array}{c|ccccccc}\text{R}&\text{CH}_3\text{COO}^{-} &+&\text{H}_2\text{O}&\rightleftharpoons &\text{CH}_3\text{COOH}&+&\text{OH}^{-}\\\text{I}&0.50\\\text{C}& -x &&&& +x &&+x\\\text{E} &0.50 - x &&&&x&&x\end{array}[/tex]
The value of pKa is large. Ka will be small. the value of [tex]x[/tex] will be much smaller than [tex]0.50[/tex] such that [tex]0.50-x \approx 0.50[/tex].
The pKa of a weak acid is the same as pKw divided by the pKb of its conjugate base.
[tex]\displaystyle \frac{[\text{CH}_3\text{COOH}]\cdot[\text{OH}^{-}]}{[\text{CH}_3\text{COO}^{-}]} = \text{K}_b(\text{CH}_3\text{COO}^{-}) \\\phantom{\displaystyle \frac{[\text{CH}_3\text{COOH}]\cdot[\text{OH}^{-}]}{[\text{CH}_3\text{COO}^{-}]} }= \frac{\text{K}_w}{\text{K}_a(\text{CH}_3\text{COOH})} \\\phantom{\displaystyle \frac{[\text{CH}_3\text{COOH}]\cdot[\text{OH}^{-}]}{[\text{CH}_3\text{COO}^{-}]}} = \frac{10^{-14}}{1.75\times 10^{-5}} = 5.71\times 10^{-10}[/tex].
[tex]\displaystyle \frac{x^{2}}{0.50} =5.71\times 10^{-10}[/tex].
[tex][\text{OH}^{-}] = x \approx 1.69\times 10^{-5}\;\text{mol}\cdot\text{L}^{-1}[/tex].
[tex]\text{pH} = \text{pK}_w + \log{[\text{OH}^{-}]} = 9.23[/tex].
. A copper sample in the form of a prism has the following dimensions: length, 1.25 m; width, 1.25 m; height, 2.15 m. If the density of copper is reported as 8.9 g/cm3, calculate, using dimensional analysis, the mass of the sample in kilograms.
= 29,898.4375 Kg
Explanation;Volume of a prism is given by the formula;
V = base area × height
= 1.25 m × 1.25 m × 2.15 m
= 3.359375 m³
Density = 8.9 g/cm³
This is equivalent to ; 8900 kg/m³
Therefore;
Mass = Density × volume
= 8900 kg/m³ × 3.359375 m³
= 29,898.4375 Kg
Answer:
3.0 x 104 kg
Explanation:
what is the sun made of
The sun is made up of hot gas.
The sun is a star and is the brightest object in the sky. The sun is made up of burning gasses. The sun's light and heat comes from its core which is in the center of it. Flares of hot gas shoot out from the sun's surface.
what is the mass of 50 carbon atoms? What is the mass of 50 hydrogen atoms?
The mass of 50 carbon atoms is [tex]\bold{99.07\;\times\;10^{-23}}[/tex] amu, and the mass of 50 hydrogen atoms is [tex]\bold{8.30\;\times\;10^{-23}}[/tex] amu.
Computation for the mass of carbon and hydrogen atomThe mass of an atom can be given by the Avogadro law.
According to the Avogadro law, 1 mole of an element is composed of [tex]\rm 6.023\;\times\;10^{23}[/tex] atoms. The molar mass of an element is the mass of a mole of substance.
Thus, the mass of atoms can be given by:
[tex]\rm 6.023\;\times\;10^2^3\;atoms=molar\;mass[/tex]
Mass of 50 carbon atoms can be given as:Molar mass of carbon is 12 amu.
[tex]\rm 6.023\;\times\;10^2^3\;Carbon\;atoms=12.01\;amu\\\\50\;Carbon\;atoms=\dfrac{12.01}{6.023\;\times\;10^2^3}\;\times\;50\;amu\\\\50\;Carbon\;atoms=99.70\;\times\;10^{-23}\;amu[/tex]
The mass of 50 carbon atoms is [tex]99.70\;\times\;10^{-23}[/tex] amu.
The mass of 50 hydrogen atoms is given by:Molar mass of hydrogen is 1 amu.
[tex]\rm 6.023\;\times\;10^2^3\;Hydrogen\;atoms=1\;amu\\\\50\;Hydrogen\;atoms=\dfrac{1}{6.023\;\times\;10^2^3}\;\times\;50\;amu\\\\50\;Hydrogen\;atoms=8.30\;\times\;10^{-23}\;amu[/tex]
The mass of 50 hydrogen atoms is [tex]8.30\;\times\;10^{-23}[/tex] amu.
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What is number “4” in SiCi4?
It is a subscript
Also do you mean Cl not Ci. I assume you do because then it means 4 chlorine in that compound.
Which of the following are true about electricity and magnetism? I. An electric current can be produced by a changing magnetic force. II. A magnetic force can be produced by an electric current. III. Energy cannot be transferred by an electric current. IV. A magnetic force can attract a metal object only if the object is touching the magnet.
I. An electric current can be produced by a changing magnetic force.
II. A magnetic force can be produced by an electric current.
Explanation;Electric current is the net movement of electric charges in a single direction, measured in amperes (A).Electric current produces a magnetic field. Electric currents and magnets exert force on each other, and this relationship has many uses. A temporary magnet, known as an electromagnet, can be made by passing electric current through a wire that is coiled around an iron core. A magnet can also be used to generate electricity. When a wire moves within a magnet's magnetic field, electricity is produced.Answer:
I. An electric current can be produced by a changing magnetic force.
II. A magnetic force can be produced by an electric current.
If a reaction solution at equilibrium is cooled down and the color shift moves toward the reactants, is the reaction endothermic or exothermic?
Answer:
Endothermic reaction.
Explanation:
Le Châtelier's principle states that when there is an dynamic equilibrium, and this equilibrium is disturbed by an external factor, the equilibrium will be shifted in the direction that can cancel the effect of the external factor to reattain the equilibrium.For endothermic reaction, it can be represented as:
Reactants + heat ↔ Products.
As the temperature cooled, it is like that decreasing the concentration of reactants side, that shifts the reaction towards the lift side (reactants side) to attain the equilibrium again.
So, the reaction is an endothermic reaction.
Which can be used to prevent initial entry of bacteria into the body
Washing your hands before eating?
Answer:
Inflammation.
Explanation:
The same reason you would die if your body temperature gets too high. Our bodies are meant to perform at an optimal temperature because the cells within our body perform cellular processes perfectly at that temperature. Same goes with bacteria. At high temperatures, proteins degrade and denature and fail to function. Your membrane transport proteins break apart: you can't get things in or out of your cells. You can no longer establish electron gradients for ATP synthesis: your body can no long provide itself with energy. Your ribosomes denature and fail to carry out protein synthesis: you cannot build new cells to replace the dying ones. You are dead.
Which unit can be used to express the rate of a reaction? A. mL / s B. mL / g C. g / mL D. mL / mol E. s / mL
Answer:A) mL / s
Explanation:This is the amount of milliliters per second
A measurement of how often something occurs in a given time period is _____.
A.) Amplitude
B.) Frequency
C.) Wavelength
D.) Sonic Boom
frequency
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Please select the word from the list that best fits the definition This kingdom is the only kingdom of eukaryotes that contains both autotrophs and heterotrophs and unicellular and multicellular organisms.
This Kingdom is the Protists Kingdom.
Answer:
Protists kingdom
Explanation:
The Protista Kingdom is one of the kingdoms of living beings, characterized by eukaryotic, autotrophic or heterotrophic and unicellular or multicellular organisms. Protists comprise protozoa and algae. There are also myxomycetes, organisms similar to fungi, but classified as protists.
Despite all this diversity, this kingdom is best represented by the presence of protoariums that are, in the great majority, microscopic eukaryotic beings (have a library) and heterotrophic beings that live in aquatic and humid environments. They can live alone or form colonies with a differentiation of specialized reproductive cells.
To what volume should 25ml of 15m nitric acid be diluted to prepare a 3m solution
We can use the dilution formula to find the volume of the diluted solution to be prepared
c1v1 = c2v2
Where c1 is concentration and v1 is volume of the concentrated solution
And c2 is concentration and v2 is volume of the diluted solution to be prepared
Substituting the values in the equation
15 M x 25 mL = 3 M x v2
v2 = 125 mL
The 25 mL concentrated solution should be diluted with distilled water upto 125 mL to make a 3 M solution
To dilute 25 mL of 15 M nitric acid to prepare a 3 M solution, the final volume after dilution should be c. 125 mL.
To dilute 25 mL of 15 M nitric acid to prepare a 3 M solution, you can use the formula:
C₁V₁ = C₂V₂
Where C₁ = concentration of the stock solution, V₁ = volume of the stock solution, C₂ = final concentration, and V₂ = final volume after dilution.
25 mL x 15 M = 3 M x V₂V₂ = (25 mL x 15 M) / 3 M = 125 mLTo prepare a 3 M solution, you need to dilute the 25 mL of 15 M nitric acid to a final volume of 125 mL.
Correct question is: To what volume should 25ml of 15m nitric acid be diluted to prepare a 3M solution
a. 120 ml
b. 130 ml
c. 125 ml
d. 135 ml
1. Which elements are known as d-block elements?
transition metals
alkali earth metals
halogens
alkali metals
The d-block elements are found in groups 3, 4, 5, 6, 7, 8, 9, 10, 11, and 12 of the periodic table.
So your answer is A) Transition metals
Answer:
The answer is Transition metals they are the d-block elements.
Explanation:
The transition metals are called d-block due to these elements have electrons in the outer orbital d.
Orbitals in atoms: The atoms have electrons that are negative charged particles moving around the nucleus. The electrons are distributed in orbitals, each orbital has an energy value and representations with letters the lowest energy orbital is s, then p, d and f.
The d-orbital due to its energetic value can hold up to 10 electrons and these elements are important due to they are required for many organic, inorganic, biological and technological process.
For example: a d-block element is the Iron Fe who has magnetic properties and it is required for the human body to form hemoglobin ( protein needed for oxygen transport in cells.
given the equation Mg +2HCL --> MgCL2+H2, how many moles of hydrochloric acid are needed to react with O.50 mole of magnesium ?
Since mole ratio of magnesium to hydrochloric acid is 1:2, the answer is 1 mole of HCL.
The moles of hydrochloric acid are needed to react with O.50 mole of magnesium is 1 mole
What are moles ?The amount of substance which contains same number of atoms, molecules or ions as the number of atoms present in 12 g of carbon (C-12) is called a mole.
1 mol = 6.023 * 10²³ atoms
In the question
An equation Mg +2HCl --> MgCl₂+H₂ is given
It is asked that moles of hydrochloric acid needed to react with O.50 mole of magnesium = ?
It can be seen that the equation given is balanced as the number of atoms of the elements in the reactants is equal to the atoms in the products.
The mole ratio of Mg to HCl is 1 : 2
The mole of Magnesium is 0.5
Therefore the mole of HCl required to react will be 1 mol
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Energy can generally be considered to be either kinetic energy or potential energy. Some specific forms of energy, such as electrical, magnetic, and gravitational energy, can operate in the space around objects and affect other objects that come near. In these examples,
A.
energy is continuously created.
B.
energy is continuously destroyed.
C.
energy exists in a field.
D.
all of these
C) Energy exists in a field.
C energy exists in a field
A 25.5 ml aliquot of HCl of unknown concentration was titrared with .113 M NaOH. It took 51.2 ml of the base to reach the endpoint of the titration. The concentration (M) of the acid was ?
0.227 M
Explanation;Volume of HCl = 25.5 mL or 25.5 / 1000 => 0.0255 L
Molarity or concentration of NaOH = 0.113 M
Volume of NaOH = 51.2 mL / 1000 = 0.0512 L
Number of moles NaOH:
Moles = Molarity x Volume
= 0.113 x 0.0512
= 0.0057856 moles of NaOH
From the equation we can obtain the mole ratio:
HCl + NaOH = NaCl + H2O
1 mole HCl : 1 mole NaOH
Therefore;
Moles of HCl : 0.0057856 moles NaOH
Hence; moles of HCl = 0.0057856 x 1 / 1
= 0.0057856 moles of HCl
Molarity of HCl = moles of HCL / Volume of HCl
M = 0.0057856 / 0.0255
= 0.227 M
In a certain organic compound, one of the carbon atoms is bonded to four atoms. One of these is a carbon atom, and the other three are hydrogen atoms. What type of bond exists between the two carbon atoms?
A. Ionic
B. Dispersion force
C. Double covalent
D. Single covalent
The type of bond that exists between the two carbon atoms would be a single covalent bond.
Carbon atoms generally have 4 valence electrons and can therefore form bonds with multiple atoms by sharing the electrons with the atoms to reach an octet state. It also has the capacity to form double or triple covalent bonds with different atoms, including itself.
Out of the 4 valence electrons and covalent bonds that can be formed by the carbon, 3 have been formed with hydrogen. Thus only one bond is left and that is what the carbon atom can pick up. Hence, only a single covalent bond can be formed.
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if 2.5 moles of nitrogen (N2) react with hydrogen, how many moles of NH3 are produced
Ammonia is produced by the reaction of hydrogen and nitrogen. N2(g)+3H2(g)→2NH3(g)ammonia How many moles of N2 reacted if 0.65mole NH3 is produced? How many moles of NH3 are produced when 1.2moles H2 reacts? 2.In the acetylene torch, does this answer your question?
You adjust the temperature so that a sound wave travels more quickly through the air. You increase the temperature from 30°C to 36°C. What's the velocity of the sound wave at this new temperature?
A. 335.6 m/s
B. 350.0 m/s
C. 352.6 m/s
D. 344.0 m/s
C. 352.6 m/s
Explanation;Velocity of sound is dependent on temperature. An increase in temperature, increases the velocity of sound.
To calculate the velocity of the sound wave, we use this formula:
V = 331 + [0.6*T]; Where V is the velocity and T represents temperature.
When the temperature is 36 degree Celsius, we have
V = 331 + [0.6 * 36]
V = 331 + 21.6 = 352.6
Therefore,
V = 352.6 m/s.
how many atoms are in 1.5 mole of iron?
There are approximately 9.033 x 10^23 atoms in 1.5 moles of iron. This is calculated by multiplying the number of moles by Avogadro's number.
Explanation:The subject at hand involves calculations using Avogadro's number. Avogadro's number (6.022 x 1023) represents the number of atoms in a single mole of any substance. To calculate the number of atoms in a particular quantity of moles, you only need to multiply the amount of moles by Avogadro's number. Therefore, the number of atoms in 1.5 moles of iron would be 1.5 times Avogadro's number.
So, 1.5 (moles of iron) x 6.022 x 10^23 (atoms/mole) = 9.033 x 10^23 atoms of iron. Hence, there are about 9.033 x 10^23 atoms in 1.5 moles of iron.
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What happens when a solid is dissolved in a liquid
Answer:
adds more liquid
Explanation:
Which of these definitions could be used to define H2O as an acid? Check all that apply.
Arrhenius concept
Bronsted-Lowry concept
Lewis concept
The definition that explains H₂O as acid is Bronsted-Lowry concept, and Lewis concept. Thus, options B and C are correct.
What is an acid?An acid is given as the characteristics of a compound to liberate the hydrogen ion in the solution. The acid have the pH lower than 7 in the pH scale.
According to Bronsted Lowry concept an acid is the donor of the proton. Thus, since H₂O gives the Hydrogen ion in the solution than it is considered as acid.
According to the Lewis concept, an acid is the acceptor of the electron pair. The hydrogen in the water accepts the electron pairs thereby it is a Lewis acid.
Thus, the concepts that explains H₂O as acid is Bronsted-Lowry concept, and Lewis concept. Thus, options B and C are correct.
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Answer: b, c
Explanation:
calculate the number of sulphur atoms in 64g of sulphur
To find the number of sulfur atoms in 64g of sulfur, calculate the moles by dividing the mass by sulfur's molar mass (32 g/mol), then multiply by Avogadro's number to get 1.2044 x 10^24 sulfur atoms.
Explanation:To calculate the number of sulfur atoms in 64g of sulfur, we use the concept of molar mass and Avogadro's number. The molar mass of sulfur (S) is approximately 32 grams per mole. So, to find the number of moles of sulfur in 64g, we divide the mass by the molar mass:
Number of moles of S = mass of S (g) / molar mass of S (g/mol)
Number of moles of S = 64g / 32g/mol = 2 moles
Now, using Avogadro's number (6.022 x 1023 atoms/mole), we can find the total number of atoms:
Number of sulfur atoms = number of moles of S x Avogadro's number
Number of sulfur atoms = 2 moles x 6.022 x 1023 atoms/mole = 1.2044 x 1024 atoms
So, there are 1.2044 x 1024 sulfur atoms in 64g of sulfur.
Which is a chemical change? O A. water boiling O B. wood burning O C. glass breaking O D. ice melting E.molding iron
Answer:
B. Wood Burning
Explanation:
When you boil water, it is still water, just in vapor form
When glass breaks, it is still glass.
when frozen water (ice) melts, it is still water.
When you mold iron, it is still iron.
When you burn wood, it is not still wood. It is a new form of matter. It is ash.
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Which statement is correct about the law of conservation of energy?
Law of Conservation of Energy and Mass. The law of conservation of energy, a fundamental concept of physics, states that the total amount of energy remains constant in an isolated system. It implies that energy can neither be created nor destroyed, but can be change from one form to another.
D. Energy is transferred when atoms are rearranged
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The Black Bear has adapted to its life in New England with its dark color and ability to climb trees. Its cousin, the Polar Bear, has adapted to life in the arctic with its snow-white fur. Brainstorm another species that has adapted to life in its environment, and describe 3 characteristics that help it survive in its ecosystem
Lizards are reptiles that are closely related to snakes. Like all reptiles, lizards have scaly skin and are ectotherms—cold-blooded animals whose body temperature varies with the temperature of their surrounding environment. Most lizards are native to the tropics, but a number of species are found in temperate regions.Chameleons, iguanas, skinks, monitors, anoles, and geckos are some of the many different types of lizards.
A number of lizard species have adapted to life in the desert. Some desert lizards have toes fringed with spiny scales to help them run across the sand without sinking. Others burrow into the sand to escape the desert's intense heat, to hide from predators, or to search for small animals that they prey upon. Some burrowing lizards even have clear scales on their eyelids that protect their eyes but still allow them to see while they move under the sand.
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Which of the following would you expect to change a liquid's density? A. the temperature of the liquid B. the surface area of the liquid C. the container in which the liquid is located D. all of these
i believe its A. the temperature of the liquid
H2 + O2 ----> H2O What is the mole ratio of hydrogen to water?
2:2
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The mole ratio of reactants and products is learned by comparing the coefficients of the balanced equation. The current equation is unbalanced, so adding some coefficients to help balance the reactants and products is necessary.
2H2 + O2 —— 2H2O
In this equation, you can count the number of hydrogens and oxygens on each side to verify that there are the same on each. Now, compare the coefficients:
2H2:2H2O
2:2
The mole ratio of hydrogen to water is 2:2, simplified to 1:1. Choosing which ratio is to be used is dependent on the context of the question, however both are technically correct.
A mixture is made of two or more materials that A. cannot be separated by any means. B. cannot be separated by physical means. C. can be separated by physical means. D. can only be separated by chemical means.
The answer would be option D. can only be seperated by chemical means
The answer is C
A mixture is a substance that is made up of two or more materials that can be separated by physical means.
Physical means of separating mixtures include sorting, evaporation, filtration, screening, magnetism, boiling, and chromatography.
How many atoms are in mercury (ii) biocarbonate?
Alias: Mercuric Hydrogen Carbonate; Mercury(II) Bicarbonate
Formula: Hg(HCO3)2
Molar Mass: 322.6237