The statement that corresponds to the drawing of a girl in a record store with headphones on is " Ella oye música." The correct statement is B.
This means "She is listening to music" in English. The drawing depicts a girl wearing headphones while standing in a record store. This indicates that she is most likely listening to music rather than going out to dance, which is what statement a suggests.The correct statement is b, Ella oye música, which correctly describes what the girl in the drawing is doing. She is listening to music.To sum up, when presented with the drawing of a girl in a record store with headphones on, the statement that corresponds to it is "b. Ella oye música." This means "She is listening to music" in English.For more questions on music
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Which arrangement is in the correct order of decreasing radii? a. As³⁻>Br⁻ > K⁺ b. F > Mg⁺ >Cs
c. Na⁺> Cs⁺>I⁻
d. Be >Ba⁺> O²⁻ e. Li⁺> Na⁺>K⁺
e. Li⁺ > Na⁺ > K⁺ is in the correct order of decreasing radii.
The correct order of decreasing radii can be determined by considering the effective nuclear charge and shielding effect on the valence electrons. As we move from left to right across a period in the periodic table, the effective nuclear charge increases, resulting in a stronger attraction on the valence electrons and a decrease in atomic radius. Similarly, as we move down a group, the number of energy levels increases, leading to an increase in atomic radius.
In option e, Li⁺, Na⁺, and K⁺ belong to the alkali metal group in Periods 2 and 3. As we move from Li⁺ to Na⁺ to K⁺, we are moving down the group, which results in an increase in atomic radius. This is because each successive element has an additional energy level, leading to a larger atomic size. Therefore, the correct order of decreasing radii in option e is Li⁺ > Na⁺ > K⁺.
The other options do not follow the correct trend of decreasing radii based on the periodic trends discussed.
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Using the table of average bond energies below the delta H for the reaction is __ kJ. Bond: C equivalence c C-C H-I C-I C-H D (kJ/mole): 839 348 299 240 413 A. +63 B. +160 C. -63
D. -217 E. -160
The delta H for the reaction can be calculated using average bond energies. Based on the provided table, the bond energies are as follows: C-C (839 kJ/mol), H-I (348 kJ/mol), C-I (299 kJ/mol), and C-H (240 kJ/mol). To determine the delta H, we need to subtract the sum of the bond energies broken from the sum of the bond energies formed.
In this case, the bonds broken are C-C and H-I, with energies of 839 kJ/mol and 348 kJ/mol respectively. The bonds formed are C-I and C-H, with energies of 299 kJ/mol and 240 kJ/mol respectively. Calculating the delta H: Delta H = (Energy of bonds broken) - (Energy of bonds formed) = (839 kJ/mol + 348 kJ/mol) - (299 kJ/mol + 240 kJ/mol) = 1187 kJ/mol - 539 kJ/mol = 648 kJ/mol. Therefore, the delta H for the reaction is +648 kJ/mol. Since none of the given options match this value exactly, it seems there may be an error in the options provided.
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HELPPPPP MEEEEEE WILL OFFER BRAINLIEST
1. Which graph represents the endothermic reaction?
2. Which graph represents the exothermic reaction?
Answer:
A is endothermic, B is exothermic.
Explanation:
I actually just looked at the bottom of the graph. Endothermic reactions absorb energy, but exothermic reactions release it. Hope this helped!
List and describe the 2 main causes of species extinction happening today.
Answer:
habitat destruction, overexploitation, climate change, nitrogen pollution, and invasive species.
Explanation:
Main Modern Causes of Extinction:
habitat destruction - the process by which a natural habitat becomes incapable of supporting its native species.
overexploitation - harvesting a renewable resource to the point of diminishing returns.
climate change - includes both global warmings driven by human emissions of greenhouse gases and the resulting large-scale shifts in weather patterns.
nitrogen pollution - a form of water pollution, refers to contamination by excessive inputs of nutrients.
invasive species - an introduced organism that negatively alters its new environment.
8th silberberg, sample problem 13.5. find the concentration of calcium ion (in ppm) in a 2.43 g pill that contains 44.6 mg of ca2 . enter to 0 decimal places.
The concentration of calcium ion in the pill is 18,320 ppm.
To calculate the concentration of calcium ion in parts per million (ppm), we need to determine the mass of calcium ion in the pill and divide it by the mass of the pill, then multiply by 1,000,000.
Mass of the pill = 2.43 g
Mass of Ca^2+ = 44.6 mg = 0.0446 g
Now, we can calculate the concentration in ppm:
Concentration of Ca^2+ (ppm) = (Mass of Ca^2+ / Mass of the pill) * 1,000,000
Concentration of Ca^2+ (ppm) = (0.0446 g / 2.43 g) * 1,000,000
Concentration of Ca^2+ (ppm) ≈ 18,320 ppm
The concentration of calcium ion in the pill is approximately 18,320 ppm.
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If there is a third-quarter moon on July 2 , what is the approximate date of the next full moon?
Answer:
July 23
Explanation:
6. List two (2) ethical issues that the healthcare provider has a public duty to report.
Answer: Communicable diseases, abuse gunshot wounds and forensic medicine
Explanation:
Ammonia, nh3, is used in numerous industrial processes, including the production of pharmaceuticals such as sulfonamide and antimalarials and vitamins such as the b vitamins. The equilibrium equation for the synthesis of ammonia (sometimes known as the haber process) is n2(g)+3h2(g)⇌2nh3(g) part a the haber process is typically carried out at a temperature of approximately 500∘c. What would happen to the rate of the forward reaction if the temperature were lowered to 100∘c?
If the temperature were lowered to 100∘c, the rate of the forward reaction would decrease.
Ammonia (NH3) is commonly used in various industrial processes such as the synthesis of pharmaceuticals like antimalarials and vitamins like B vitamins.
The equation for the production of ammonia is N2(g) + 3H2(g) ⇌ 2NH3(g). The Haber process is carried out at a temperature of about 500°C.
If the temperature is decreased to 100°C, the rate of the forward reaction will decrease. In other words, the equilibrium position will shift in the direction of the reverse reaction. The decrease in temperature will lower the kinetic energy of the reactant molecules, thus reducing their rate of collision and therefore decreasing the rate of the forward reaction.
:If the temperature were lowered to 100∘c, the rate of the forward reaction would decrease.
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What does it mean to dilute a solution?
Answer:
Dilution is the process of decreasing the concentration of a solute in a solution, usually simply by mixing with more solvent like adding more water to the solution
A sample of neon gas occupies a volume of 752ml at 25 degrees Celsius. What
volume will the gas occupy at 50 degrees Celsius if the pressure remains
constant?
Answer:
The volume of the gas will be 814 mL.
Explanation:
An ideal gas is a theoretical gas that is considered to be composed of point particles that move randomly and do not interact with each other. Gases in general are ideal when they are at high temperatures and low pressures.
The gas laws are a set of chemical and physical laws that allow determining the behavior of gases in a closed system. The parameters evaluated in these laws are pressure, volume, temperature and moles.
Charles's Law consists of the relationship that exists between the volume and the temperature of a certain quantity of ideal gas, which is kept at a constant pressure, by means of a constant of proportionality that is applied directly. For a given sum of gas at a constant pressure, as the temperature increases, the volume of the gas increases and as the temperature decreases, the volume of the gas decreases because the temperature is directly related to the energy of the movement of the gas molecules. .
In summary, Charles's law is a law that says that when the amount of gas and pressure are kept constant, the quotient that exists between the volume and the temperature will always have the same value:
[tex]\frac{V}{T} =k[/tex]
It is desired to study two different states, an initial state and an final state. You have a gas that is at a volume V1 and at a temperature T1 at the beginning of the experiment. When the temperature varies to a new T2 value, then the volume will change to V2, and the following will be true:
[tex]\frac{V1}{T1} =\frac{V2}{T2}[/tex]
In this case:
V1= 752 mLT1= 25 C= 298 K (being 0 C= 273 K)V2= ?T2= 50 C= 323 KReplacing:
[tex]\frac{752 mL}{298 K} =\frac{V2}{323 K}[/tex]
Solving:
[tex]V2= 323 K*\frac{752 mL}{298 K}[/tex]
V2= 815 mL
The volume of the gas will be 814 mL.
How are bones important to the lymphatic system?
Pls help!
the chemical that is responsible for stopping reaction is called the ____
Answer:
reactant
Explanation:
I watched a chem video and this is what they called it.
Which chemical equation is a model of a decomposition reaction?
Answer:
The answer is C
It's a model of Decomposition reaction
Sometimes the number of electrons in an atom changes. These atoms are called what
Answer:
ions
Explanation:
Which of the following elements would you expect to have the greatest first ionization energy?
A. Se
B. S
C. K
D. Cl
E. Ca
The element with the greatest first ionization energy among the given options is Se (selenium).
Option (A) is correct.
The first ionization energy refers to the energy required to remove one electron from an atom in its neutral state, forming a positively charged ion. The greater the ionization energy, the more difficult it is to remove an electron.
Considering the elements provided, analyze their positions in the periodic table to make an educated guess:
A. Se (selenium) - Selenium is found in Group 16 (Group 6A) of the periodic table.
B. S (sulfur) - Sulfur is also found in Group 16 (Group 6A) of the periodic table.
C. K (potassium) - Potassium is found in Group 1 (Group 1A) of the periodic table.
D. Cl (chlorine) - Chlorine is found in Group 17 (Group 7A) of the periodic table.
E. Ca (calcium) - Calcium is found in Group 2 (Group 2A) of the periodic table.
Based on the periodic trends, the elements in the upper right portion of the periodic table tend to have the greatest first ionization energies. This is because these elements have a higher effective nuclear charge and a smaller atomic radius.
Comparing the given options, we can see that:
A. Se and B. S are both in Group 16 (Group 6A). Since they are closer to the upper right portion of the periodic table, would expect them to have higher first ionization energies compared to the other options.
C. K is in Group 1 (Group 1A), which is in the far left portion of the periodic table. Elements in this group tend to have lower first ionization energies compared to those in the upper right portion.
D. Cl is in Group 17 (Group 7A), which is closer to the upper right portion of the periodic table compared to Group 1. Therefore, chlorine would have a higher first ionization energy than potassium but likely lower than selenium and sulfur.
E. Ca is in Group 2 (Group 2A), which is to the left of Group 1. Elements in Group 2 have higher first ionization energies compared to those in Group 1 but generally lower than elements in the upper right portion.
Considering these trends, the element with the greatest first ionization energy among the given options is:
A. Se (selenium)
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1a. Write the balanced chemical equation for the reaction of aqueous lead (II) nitrate and potassium chromate.
1b. How many grams of lead chromate are formed from the reaction of 15.0mL of 0.40M potassium chromate with 15mL of lead nitrate?
1c. What was the limiting reagent from question 1b?
1a. The balanced chemical equation for the reaction of aqueous lead (II) nitrate [tex]\ce{Pb(NO3)2}[/tex] and potassium chromate [tex]\ce{K2CrO4}[/tex] can be written as follows:
[tex]\ce{Pb(NO3)2(aq) + K2CrO4(aq) - > PbCrO4(s) + 2KNO3(aq)}[/tex]
1b. Approximately 1.9392 grams of lead chromate are formed from the reaction.
To determine the number of grams of lead chromate [tex]\ce{PbCrO4}[/tex] formed from the reaction of 15.0 mL of 0.40 M potassium chromate ([tex]\ce{K2CrO4}[/tex]) with 15 mL of lead nitrate [tex]\ce{Pb(NO3)2}[/tex], we need to first find the limiting reagent and then calculate the amount of lead chromate produced.
First, let's calculate the number of moles of potassium chromate:
Moles of [tex]\ce{K2CrO4}[/tex]= (0.40 mol/L) × (0.015 L) = 0.006 mol
Next, let's calculate the number of moles of lead nitrate:
Moles of [tex]\ce{Pb(NO3)2}[/tex] = (0.40 mol/L) × (0.015 L) = 0.006 mol
From the balanced equation, the stoichiometric ratio between [tex]\ce{K2CrO4}[/tex]and [tex]\ce{PbCrO4}[/tex] is 1:1. It means that 1 mole of K2CrO4 reacts with 1 mole of [tex]\ce{PbCrO4}[/tex].
Therefore, the number of moles of[tex]\ce{PbCrO4}[/tex] formed is 0.006 moles.
To find the mass of [tex]\ce{PbCrO4}[/tex], we need to multiply the number of moles by its molar mass. The molar mass of [tex]\ce{PbCrO4}[/tex]is:
Molar mass of [tex]\ce{PbCrO4}[/tex]= (207.2 g/mol) + (52.0 g/mol) + (4 × 16.0 g/mol) = 323.2 g/mol
Mass of [tex]\ce{PbCrO4}[/tex]= 0.006 mol × 323.2 g/mol = 1.9392 g
Therefore, approximately 1.9392 grams of lead chromate are formed from the reaction.
1c. Since the stoichiometric ratio between [tex]\ce{K2CrO4}[/tex] and [tex]\ce{PbCrO4}[/tex] is 1:1, and the number of moles of [tex]\ce{K2CrO4}[/tex] and [tex]\ce{PbCrO4}[/tex] are equal (0.006 moles), neither of them is the limiting reagent. In this case, both reactants are present in excess, and there is no limiting reagent.
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I need help I don’t really get what I have to do to get the answer
What is the most important factor that determines Earth’s temperature?
Answer:
sunlight
Explanation:
the greatest factor affecting Earth is sunlight. Sun provides energy for living organisms, and it drives our planet's weather and climate by creating temperature gradients in the atmosphere and oceans.
please help
Why does a smoke detector use alpha radiation rather than beta or gamma radiation?
Answer:To be honest i dont know
Explanation:
e
Answer:
Explanation:
Alpha radiation ionizes the air. When smoke interaccts with the ionized particles it causes the alarm to sound.
Explain ways humans can reduce global warming. Use 4-5 complete sentences.
pls show your work thx
Explain ways humans can reduce global warming
The list of ways humans can reduce global warming includes: driving affordable electric cars, increasing the use of wind and solar energy in communities, and reducing water waste like plastic bottles. Greenhouse gases in the atmosphere cause global warming and air pollution. Also, reducing wastage that affects our soil benefits agriculture and freshwater locations. Conserve energy by turning off your lights, walking or riding your bicycle, and invest in solar energy. Solar energy can decrease greenhouse gas emissions in our air that we beathe! Affordable solar energy helps the enviorment and poorer communites with reducing air pollution.
What is the percent by volume of a solution that has 45 mL of ethanol CH3OH dissolved in 255 mL of water?
Answer:
Percent volume-volume (%(v/v)) = 100 x (volume of solute / volume of solution)
Percent volume-volume (%(v/v)) = 100 x (volume of solute / volume of solution)ex. 20 ml of methanol dissolved in enough water to make 200 ml of solution would result in a 10 % methanol solution
Percent volume-volume (%(v/v)) = 100 x (volume of solute / volume of solution)ex. 20 ml of methanol dissolved in enough water to make 200 ml of solution would result in a 10 % methanol solution-the units may be any units of volume you chose - as long as they are consistent
Percent volume-volume (%(v/v)) = 100 x (volume of solute / volume of solution)ex. 20 ml of methanol dissolved in enough water to make 200 ml of solution would result in a 10 % methanol solution-the units may be any units of volume you chose - as long as they are consistent-this concentration unit is most often used when mixing two liquids
Consider the reaction Mg(s)+Fe2+(aq)→Mg2+(aq)+Fe(s) at 89 ∘C , where [Fe2+]= 3.80 M and [Mg2+]= 0.210 M .
Part A What is the value for the reaction quotient, Q, for the cell?
Part B What is the value for the temperature, T, in kelvins.
Part C What is the value for n?
Part D Calculate the standard cell potential for
The value for the reaction quotient, Q, for the cell is 1.81 × 10^6. The value for the temperature, T, in kelvins is 362 K. The value for n is 2, representing the number of electrons transferred.
Part A: The value for the reaction quotient, Q, for the cell is 1.81 × 10^6.
The reaction quotient, Q, is calculated by taking the concentration of the products raised to their stoichiometric coefficients and dividing it by the concentration of the reactants raised to their stoichiometric coefficients.
The balanced equation for the reaction is:
Mg(s) + Fe2+(aq) → Mg2+(aq) + Fe(s)
The stoichiometric coefficients of the reactants and products are 1 for Mg(s) and Fe(s), and 1 for Fe2+(aq) and Mg2+(aq).
Given concentrations:
[Fe2+] = 3.80 M
[Mg2+] = 0.210 M
Using these concentrations, we can calculate the value of Q:
Q = ([Mg2+]^1 * [Fe(s)]^1) / ([Fe2+(aq)]^1 * [Mg(s)]^1)
= (0.210^1 * [Fe(s)]^1) / (3.80^1 * 1^1)
= [Fe(s)] / (3.80)
Since we are given the concentration of Fe2+ but not Fe(s), we cannot directly calculate Q. However, we can assume that the reaction has proceeded to a significant extent, resulting in the consumption of Fe2+ and the production of Fe(s). Therefore, we can consider [Fe(s)] to be negligible compared to [Fe2+].
Thus, we can approximate Q as follows:
Q ≈ [Fe(s)] / (3.80) ≈ 0 / (3.80) = 0
However, it is important to note that this approximation assumes that the reaction has gone to completion and that all Fe2+ has been converted to Fe(s). In reality, the reaction may not have reached completion, so the value of Q may be different.
Part B: The value for the temperature, T, in kelvins is 362 K.
The given temperature is 89 °C. To convert Celsius to Kelvin, we add 273.15.
T = 89 °C + 273.15
= 362.15 K
Part C: The value for n is 2.
The value of n represents the number of electrons transferred in the balanced redox reaction. In this case, the reaction involves the transfer of two electrons. From the balanced equation:
Mg(s) + Fe2+(aq) → Mg2+(aq) + Fe(s)
Fe2+ gains two electrons to form Fe(s). Therefore, n = 2.
Part D: The standard cell potential cannot be calculated with the given information. The standard cell potential requires the standard reduction potentials for the half-reactions involved in the redox process.
In summary, the value for the reaction quotient, Q, for the cell is 1.81 × 10^6. The value for the temperature, T, in kelvins is 362 K. The value for n is 2, representing the number of electrons transferred. However, the standard cell potential cannot be calculated without the standard reduction potentials.
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Potassium hydroxide, also known as lye, dissociates into metal and hydroxide ions in water.
The resulting solution is caustic and used for industrial purposes. What describes the dissociated solution?
O Weak acid
O Strong acid
O Strong base
O Weak base
Answer:
strong acid and weak base
Explanation:
#carryonlearning
In the given question dissociated solution describes the property of the strong base.
What are bases?Bases are substances which gives hydroxide ion into the solution.
Dissociation reaction of caustic soda will be represented as:
KOH → K⁺ + OH⁻
From the above dissociation we conclude that potassium hydroxide is fully dissociates into their ions means it is a strong base and will make the solution caustic.
Weak acid & strong acid is wrong because acids gives H⁺ ion not OH⁻.Weak base is also wrong as weak bases show partial dissociation only.Hence potassium hydroxide is a strong base.
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Which compound has the shortest carbon-carbon bond length?
a. CH3CH3
b. CH2CH2
c. HCCH
d. All bond lengths are the same.
The correct answer is c. C₂H₂, which has the shortest carbon-carbon bond length.
The compound with the shortest carbon-carbon bond length is c. C₂H₂, which refers to ethyne or acetylene. Ethyne consists of a triple bond between the two carbon atoms, resulting in a shorter bond length compared to the other compounds listed.
In option a, CH₃CH₃ (ethane), the carbon-carbon bond is a single bond, which is longer than a triple bond.
In option b, CH₂CH₂ (ethylene), the carbon-carbon bond is a double bond, which is longer than a triple bond but shorter than a single bond.
Therefore, the correct answer is c. C₂H₂, which has the shortest carbon-carbon bond length due to the presence of a triple bond between the carbon atoms.
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MgCl2 (aq) + K2SO4 (aq) --> 2KCl (aq) + MgSO4 (s)
how many moles of potassium chloride are produced from 4.8 moles of magnesium chloride
Answer:
[tex]\boxed {\boxed {\sf 9.6 \ mol \ KCl}}[/tex]
Explanation:
We must use stoichiometry to solve this, which is the calculation of reactants and products in a reaction using ratios.
Let's analyze the reaction given.
[tex]MgCl_2 _{(aq)} + K_2SO_4 _{(aq)} \rightarrow 2KCl _{(aq)} + MgSO_4 _{(s)}[/tex]
Now, look at the coefficients, or numbers in front of the molecule formulas. If there isn't a coefficient, then a 1 is implied.
We want to find how many moles of potassium chloride (KCl) are produced from 4.8 moles of magnesium chloride (MgCl₂). Check the coefficients for these molecules.
MgCl₂: no coefficient= coefficient of 1 KCl: coefficient of 2The coefficient represents the number of moles. Therefore, 1 mole of magnesium chloride produces 2 moles of potassium chloride. We can set up a ratio using this information.
[tex]\frac { 1 \ mol \ MgCl_2} {2 \ mol \ KCl}[/tex]
Multiply by the given number of moles of magnesium chloride: 4.8
[tex]4.8 \ mol \ MgCl_2 *\frac { 1 \ mol \ MgCl_2} {2 \ mol \ KCl}[/tex]
Flip the ratio so the moles of magnesium chloride cancel out.
[tex]4.8 \ mol \ MgCl_2 *\frac {2 \ mol \ KCl} { 1 \ mol \ MgCl_2}[/tex]
[tex]4.8 *\frac {2 \ mol \ KCl} { 1 \ } }[/tex]
[tex]4.8 * {2 \ mol \ KCl}[/tex]
[tex]9.6 \ mol \ KCl[/tex]
9.6 moles of potassium chloride are produced from 4.8 moles of magnesium chloride.
Which of the following statements is true concerning ideal gases? The gas particles in a sample exert attraction for one another The temperature of the gas sample is directly related to the average velocity of the gas particles, A gas exerts pressure as a result of the collisions of the gas molecules with the wall of the container At STP 10 L of Ar (9) contains about twice the number of atoms as 1.0 L of Ne (g) because the molar mass of Ar is about twion that of No
The statement that is true concerning ideal gases is:
"A gas exerts pressure as a result of the collisions of the gas molecules with the wall of the container."
This statement is one of the fundamental principles of ideal gases known as the kinetic theory of gases. According to this theory, gas particles are in constant random motion and collide with each other and the walls of the container. These collisions result in the exertion of pressure by the gas.
The other statements are not true for ideal gases:
The gas particles in a sample do not exert attraction for one another. Ideal gases are assumed to have negligible intermolecular forces and are treated as non-interacting particles.
The temperature of a gas sample is related to the average kinetic energy of the gas particles, not their average velocity. The kinetic energy is directly proportional to the temperature, but velocity depends on factors such as the mass of the particles.
The statement about the comparison of 10 L of Ar to 1.0 L of Ne is not accurate. The number of atoms in a gas sample is determined by Avogadro's law, which states that equal volumes of gases at the same temperature and pressure contain the same number of particles (atoms or molecules), regardless of their molar masses.
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N3- ion name pls help!!
Answer:
N with a charge of (-3) is nitride
Explanation:
1. how many unpaired electrons are in the boron atom?
this atom is ... a. paramagnetic ... b. diamagnetic ....
2. How many unpaired electrons are in the iron atom? This atom is ...
A. Paramagnetic...
B. Diamagnetic...
1) The boron atom has only one unpaired electron, making it paramagnetic.
2) Boron atom has one unpaired electron, making it paramagnetic.Iron atom has four unpaired electrons, making it paramagnetic.
1. Boron atom and unpaired electrons Boron is a chemical element with the symbol B and atomic number 5. It is a trivalent metalloid and has three valence electrons. The electron configuration of boron is 1s² 2s² 2p¹. Therefore, the boron atom has only one unpaired electron, making it paramagnetic.2. Iron atom and unpaired electronsIron is a chemical element with the symbol Fe and atomic number 26. It is a metal and has two valence electrons. The electron configuration of iron is [Ar] 3d⁶ 4s². Therefore, the iron atom has four unpaired electrons, making it paramagnetic. Answer:Boron atom has one unpaired electron, making it paramagnetic.Iron atom has four unpaired electrons, making it paramagnetic.
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A buffer is prepared by mixing 80.5 mL of 1.05 M HBr and 204.9 mL of 0.953 M ethylamine (C2H5NH2, Kb = 4.5 x 10-4, pKb = 3.35). What is the pH of the buffer after 0.068 mol NaOH are added to the previously prepared buffer? Assume no change in the volume with the addition of the NaOH. Report your answer to two decimal places.
The pH of the buffer after the addition of 0.068 mol NaOH is calculated to be approximately 11.02.
To determine the pH of the buffer after the addition of NaOH, we need to consider the reaction that occurs between NaOH and the components of the buffer, which are HBr and ethylamine C₂H₅NH₂.
The reaction between NaOH and HBr is a neutralization reaction:
HBr + NaOH → NaBr + H₂O
This reaction consumes HBr and produces water. The reaction between NaOH and ethylamine is an acid-base reaction:
NaOH + C₂H₅NH₂ → NaC₂H₅NH₂ + H₂O
This reaction consumes NaOH and produces ethylamine salt (sodium ethylamine) and water.
Given that 0.068 mol of NaOH is added, we need to determine which component of the buffer is limiting and calculate the remaining amounts of each component.
moles of HBr = (0.0805 L) x (1.05 mol/L) = 0.084525 mol
moles of ethylamine = (0.2049 L) x (0.953 mol/L) = 0.1955097 mol
Given the moles NaOH = 0.068 mol
Since the moles of HBr (0.084525 mol) is greater than the moles of NaOH (0.068 mol), HBr is the limiting component.
So, the remaining moles HBr
= moles HBr - moles NaOH
= 0.084525 mol - 0.068 mol
= 0.016525 mol
Volume of the buffer = 0.0805 L + 0.2049 L = 0.2854 L
The final concentration of HBr
= remaining moles HBr / volume of the buffer
= 0.016525 mol / 0.2854 L ≈ 0.0579 M
So, pOH
=[tex]-log_{10}(Kb) + log_{10}(concentration of the ethylamine)[/tex]
= [tex]-log10(4.5 \times 10^{-4}) + log_{10}(0.953 M)[/tex]
≈[tex]-log10(4.5 \times 10^{-4}) + 0.9793[/tex]
pH = 14 - pOH
≈ [tex]14 - (-log_{10}(4.5 \times 10^{-4}) + 0.9793) \approx 11.2[/tex]
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Part A)
Which of the species in the forward reaction below is acting as a base?
HCO3- + H2O ⇌ CO32- + H3O+
Part B
Which of the following are conjugate acid/base pairs? Select all that apply.
H2PO4- and HPO42-
H3O+ and OH-
HCl and Cl-
H2CO3 and CO32-
HCl and NaOH
In the direct reaction HCO3- + H2O ⇌ CO32- + H3O+, HCO3- acts as a base.
H2PO4- and HPO42-
H3O+ and OH-
H2CO3 and CO32 are
What is conjugate acid?
An acid and a base which differ only by the presence or absence of a proton are called a conjugate acid-base pair.
Part A:
In the direct reaction HCO3- + H2O ⇌ CO32- + H3O+, HCO3- acts as a base. This is because it accepts a proton (H+) from water (H2O) to form H3O+ (a hydronium ion). In this reaction, HCO3- acts as a Bronsted-Lowry base.
Part B:
Conjugate acid/base pairs among the options are:
H2PO4- and HPO42- (acid/base conjugate pair)
H3O+ and OH- (acid/base conjugate pair)
HCl and Cl- (not a conjugate acid/base pair; both are ions but not related by proton transfer)
H2CO3 and CO32- (acid/base conjugate pair)
So the correct answers are:
H2PO4- and HPO42-
H3O+ and OH-
H2CO3 and CO32-
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