When a volume of 60.0 mL of 0.200 M HBr is mixed with a volume of 30.0 mL of 0.400 M CH3NH2, The pH value is mathematically given as
pH=10.64
What is the pH value when 60.0 mL of 0.200 M HBr is mixed with 30.0 mL of 0.400 M CH₃NH₂?Question Parameters:
The pH when 60.0 mL of 0.200 M HBr
30.0 mL of 0.400 M CH₃NH₂ (Kb = 4.4 × 10^{-4}).
Generally, the equation for the Chemical Reaction is mathematically given as
H Br + H_3C NH_2----- > CH_3 NH_3 Br
Therefore
oH=p^{kb}+-log[tex]\frac{salt}{base}[/tex]
OH=-log(4.4*10^{-4})+[tex]\frac{0.1}{0.1}[/tex]
OH=3.36
In conclusion, The equation pH value
pH+OH=14
Therefore
pH+=14-3.36
pH=10.64
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Calculate the pH of a solution in which one normal adult dose of aspirin (640 mg ) is dissolved in 10 ounces of water. Express your answer to one decimal place.
The pH of the solution in which one normal adult dose aspirin is dissolved is : 2.7
Given data :
mass of aspirin = 640 mg = 0.640 g
volume of water = 10 ounces = 0.295735 L
molar mass of aspirin = 180.16 g/mol
moles of aspirin = mass / molar mass = 0.00355 mol
Determine the pH of the solutionFirst step : calculate the concentration of aspirin
= moles of Aspirin / volume of water
= 0.00355 / 0.295735
= 0.012 M
Given that pKa of Aspirin = 3.5
pKa = -logKa
therefore ; Ka = [tex]10^{-3.5}[/tex] = [tex]3.162 * 10^{-4}[/tex]
From the Ice table
[tex]3.162 * 10^{-4}[/tex] = [tex]\frac{x + H^+}{[aspirin]}[/tex] = [tex]\frac{x^{2} }{0.012-x}[/tex]
given that the value of Ka is small we will ignore -x
x² = [tex]3.162 * 10^{-4} * 0.012[/tex]
x = [tex]1.948 * 10^{-3}[/tex]
Therefore
[ H⁺ ] = [tex]1.948 * 10^{-3}[/tex]
given that
pH = - Log [ H⁺ ]
= - ( -3 + log 1.948 )
= 2.71 ≈ 2.7
Hence we can conclude that The pH of the solution in which one normal adult dose aspirin is dissolved is : 2.7
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Which is not a reason humans need to stay hydrated
A. Removal of liquid waste
B. Main a steady temperature
C.Lubricate joints.
D.Provide vitamin C to the body
The one that is not a reason humans need to stay hydrated is to provide vitamin C to the body.
What is dehydration?Dehydration occurs when you do not drink enough fluid or lose more fluid than you take in.
Sweating, tears, vomiting, urine, or diarrhea all cause fluid loss. The severity of dehydration is affected by a variety of factors, including climate, level of physical activity, and diet.
Dehydration symptoms include dark urine, decreased urination, headaches, fatigue, dry skin, decreased skin turgor, and poor concentration. Drink plenty of water or other fluids every day to ensure you're getting enough fluids.
Milk, according to research, is one of the best beverages for hydration, even better than water or sports drinks. Milk's natural electrolytes, carbohydrates, and protein are credited with its effectiveness, according to researchers.
Proper water content will aid in removal of waste, maintaining temperature, lubrication, and many more.
Thus, the correct option is D.
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c) If a mixture of zinc powder and cobalt(II) oxide is heated, the following reaction occurs: Zn(s) + COO(s) → ZnO(s) + Co(s) (i) Which metal is higher in the reactivity series? (ii) The zinc can be described as a reducing agent. Using this example, explain what is meant by the term 'reducing agent'. (iii) Which substance in this reaction has been oxidised?
Answer:
The metal which reduces the other compound is the one higher in reactivity. So in this case, it is.
Explanation:
Analyze the chart below and then answer the follow question. In 2020, how does the percentage of the population with access to drinking water facilities in North America compare to that of the World?
Question options:
Compared to the average population around the World, North America has a 24% greater percentage of people with access to safely managed drinking water.
Compared to the average population around the World, North America has a 98% greater percentage of people with access to safely managed drinking water.
Compared to the average population around the World, North America has a 16% greater percentage of people with access to safely managed drinking water.
Compared to the average population around the World, North America has a 74% greater percentage of people with access to safely managed drinking water.
Answer:
Explanation:
In North America, 96% of people have safely managed drinking water, and the World on average has 74% of people with access to safely managed drinking water. 96-74=22% difference.
Which part of the water cycle happens to most water after surface runoff?
O Collection
O Condensation
Evaporation
O Precipitation
Answer:
collection
Explanation:
What is the molarity of a solution made by dissolving 65.0 g of NaNO3 in enough water to make 0.350 L of solution?
First we need the molar mass of NaNO_3:-
[tex]\\ \sf\longmapsto 23+14+3(16)[/tex]
[tex]\\ \sf\longmapsto 37+48[/tex]
[tex]\\ \sf\longmapsto 85g/mol[/tex]
Now we need moles of NaNO_3
[tex]\\ \sf\longmapsto No\:of\:moles=\dfrac{Given\:mass}{Molar\:mass}[/tex]
[tex]\\ \sf\longmapsto No\:of\:moles=\dfrac{65}{85}[/tex]
[tex]\\ \sf\longmapsto No\:of\:moles=0.765mol[/tex]
Now
[tex]\\ \sf\longmapsto Molarity=\dfrac{Moles\:of\:solute}{Vol\:of\:soln.\:in\:L}[/tex]
[tex]\\ \sf\longmapsto Molarity=\dfrac{0.765}{0.350}[/tex]
[tex]\\ \sf\longmapsto Molarity=2.2M[/tex]
A family is another name for a _____
on the periodic table of elements.
Answer:
Groups
Explanation:
A "family" on the periodic table is also called a "group".
A "group" or a "family" of elements are elements of the same type on the periodic table, for example, all of the transition metals on the periodic table are a "group" or a "family".
Question 7(Multiple Choice Worth 1 points)
[FW.02]Students should record information on groundwater only from sources which are
biased
O historic
reliable
secondary
Answer:
I think its reliable
Explanation:
Answer: The Answer is Up To Date
Explanation:
50.00 mL of a solution containing 0.15 M CH2 (CO2 H)2 and 0.020 M MnSO4
1. Calculate the mass in g of malonic acid required.
Watch your sig figs! (enter just the number)
Answer:
[tex]m_{solute}=0.78gCH_2 (CO_2 H)_2[/tex]
Explanation:
Hello.
In this case, for the given volume and molarity of malonic acid (solute), we can compute the mass by first computing the moles considering the definition of molarity:
[tex]M=\frac{n_{solute}}{V_{solution}} \\\\n_{solute}=M*V_{solution}=0.15mol/L*50.00mL*\frac{1L}{1000mL}\\ \\n_{solute}=0.0075molCH_2 (CO_2 H)_2[/tex]
Then, since the molar mass of the malonic acid is 104.1 g/mol, we can compute the required mass in g of malonic acid for the preparation of that solution as shown below:
[tex]m_{solute}=0.0075molCH_2 (CO_2 H)_2*\frac{104.1gCH_2 (CO_2 H)_2}{1molCH_2 (CO_2 H)_2}\\ \\m_{solute}=0.78gCH_2 (CO_2 H)_2[/tex]
Notice that the shortest number is the molarity (0.15 M) with two significant figures, that is why the answer is displayed with two significant figures too.
Regards.
Activation process and importance of zymogen
Answer:
Zymogen ActivationZymogens are activated by snipping the bonds between two or more amino acids, rather like cutting a balloon string so that it floats away. When the bonds are cut, the enzyme changes its conformation, its 3-D structure, so that the active site is free and able to become active.
Explanation:
What is the importance of meteorites?
Answer:
The study of meteorites has helped us understand the beginnings of our solar system, how planets and asteroids formed and how impacts of large meteorites have altered Earth's history and life on our planet.
Explanation:
Evan and his friends are working on a group project on matter. Michelle says that matter is anything that has mass. Ricky says matter must have mass and also be touchable. Evan thinks matter must have mass and also be visible. Leon disagrees and says that matter has both mass and takes up space. Who is correct?
Answer:
Leon
Explanation: all take up space and will have a mass to it.
State two difference between the physical properties of potassium and vanadium.
[tex]\huge \underline\frak \pink{Answer}[/tex]
[tex]\small\mathbb\red{physical \: properties \: of \: potassium}[/tex]
1) potassium are soft silvery white metal with a Boling point of 63°C (145°F) and a boling point are 770°C (1,420°F)
2) It's density is 0.862 grams per cubic centimeter less than that of water (1.00 grams per cubic centimetrer that potassium metal float in water
[tex]\small\mathbb\green{physical \: properties \: of \: vanadium}[/tex]
1) vanadium is a silvery white, ductile, metallic looking solid. they capable of the being drawn into a thin wires
2) It melting point Is about 1,900°C (3,500°F) and its boiling point is about 3,000°C (5,400°F). the density is 6.11 grams per cubic centimeter
[tex]\small\mathbb\orange{hope \: it's \: helpful \: to \: you}[/tex]
6.03g of gas has a volume of 1.00 L at STP determine the g-molar mass of the gas.
Answer:
Molar mass = 135.2 g/mol
Explanation:
Given data;
Mass of gas = 6.03 g
Volume of gas = 1.00L
Temperature = standard = 273 K
Pressure = Standard = 1 atm
Molar mass of gas = ?
Solution:
First of all we will calculate the number of moles of gas.
Formula
PV = nRT
1 atm × 1.00L = n × 0.0821 atm.L/k.mol × 273 K
1.00 atm.L = n × 22.414 atm.L/mol
n = 1.00 atm.L/22.41 atm.L/mol
n = 0.0446 mol
Molar mass:
Molar mass = mass/number of moles
Molar mass = 6.03 g/0.0446 mol
Molar mass = 135.2 g/mol
The conjugation of the trans/cis product is likely diminished due to steric interactions between the cis-phenyl and the nearby vinyl hydrogen. This interaction likely causes the phenyl ring to twist out of the plane, and thus no longer to be fully conjugated with the adjacent double bond. The trans-trans isomer has no such steric interactions, and thus it is expected to be more fully conjugated. The two isomers are thus may have different light absorbing properties.
Considering all this, which product stereoisomer do you expect to have the highest lambda max value in the UV-V is spectrum- the trans/trans or the cis/trans? Briefly explain your answer.
Answer:
The trans/trans stereoisomer.
Explanation:
So, we are going to have two stereoisomers or arrangements for this chemical compound, that is the Cis/trans, the trans/trans.
For a compound to be seen with UV, the main or primary condition is conjugation or how conjugated the chemical specie or compound is.
Thus, the more the conjugation, the more or the higher the wavelength or lands value.
=> The Trans/trans stereoisomer will have the highest lamda value or wavelength because the energy gap in its π - π* Transitioning deceases due to the STERIC interactions, and the more the decrease in the energy gap, the more or the higher the lamda value or wavelength.
which probing question lies within the scope of physics
Answer:
which affect does the industrial wastewater have on acidity of oceans ?
Answer:
which affect does the industrial wastewater have on acidity of oceans ?
Explanation:
What type of waves come out of the radio tower? Electromagnetic or Sound?
Answer:
Electromagnetic
Explanation:
Hope this helps
When population growth levels off in an ecosystem, it has reached its _________.
it represents the maximum population size a particular environment can support
The ionic compound strontium sulfide contains_______ atoms of strontium and________atoms of sulfur.
Answer:
what are the words? I don't see it
Convert 77kPa to mmHg.
Answer:
Explanation:
the conversion of 77 Killopascal to millimetre of mercury is
577.547 millimetre of mercury.
Analyze the relationship between viscosity, temperature, and change in kinetic energy by completing the table.
When temperature of fluid increases, kinetic energy increases, viscosity decreases and the fluid flows faster.
When temperature of a fluid decreases, kinetic energy decreases, viscosity increases and the fluid flows slower.
When temperature of a fluid stays the same, kinetic energy stays the same, viscosity stays the same and the fluid flow stays the same.
What is viscosity?Viscosity is the friction that exist between the internal layers of a fluid in motion.
Viscosity decreases with temperature due to the increase in the kinetic energy of the molecules of the fluid.
Based on the relationship between temperature, kinetic energy and viscosity:
when temperature increases, kinetic energy increases, viscosity decreases and the fluid flows faster. when temperature decreases, kinetic energy decreases, viscosity increases and the fluid flows slower. when temperature stays the same, kinetic energy stays the same, viscosity stays the same and the fluid flow stays the same.Therefore, it can be concluded that viscosity of a fluid depends on temperature.
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Sara wanted to perform a scientific experiment relating the effect of ultraviolet (UV) light on the survival rate of microscopic protists in pond water. She went to a local pond and collected a large bucket of pond water, then poured 500 milliliters of the pond water into each of two identical glass jars. She viewed a small sample of the pond water under a compound light microscope to verify that the water contained multiple species of microscopic protozoa. She was also able to get a rough count of the organisms in her sample using a special microscope slide. To set up her experiment Sara took one of the glass jars with pond water and protists, labeled it “100”, and placed it 10 centimeters under a lamp that transmits 100% UV light. The other jar, she labeled “O” and placed it 10 centimeters under a lamp that transmits 0% UV light. After the pond water/protist mixture in both jars was exposed to the lights for 8 hours, she collected samples from both jars. She used the same procedure as before and made a 2nd count of the microorganisms to compare to her first count.
12. If Sara were to graph her data using a bar graph, what should her axes be labeled?
3) Chemically pure water is A) an element B) a compound C) a mixture D) a solution
what is the experimental group? on edpuzzle
Answer: An experimental group is a test sample or the group that receives an experimental procedure.
Explanation: This group is exposed to changes in the independent variable being tested. The values of the independent variable and the impact on the dependent variable are recorded. An experiment may include multiple experimental groups at one time.
Hope this helps! :)
Fill in the coefficients that will balance the following reaction: fill blanks
___C8H18 + ___02->___ CO2+ ___H20
Answer:
2C⁸H¹⁸+ 25O² => 16CO² + 18H²O
It can also be written as;
C⁸H¹⁸ + 25/2 O² => 8CO² + 9H²O
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1 CCS 8SCI SMA 3 L.5.1, 5.2 I 4 of 19
Which best describes how green plants use the glucose they produce in photosynthesis?
A. Green plants store the glucose they produce, and it becomes a food source for animals.
B. Green plants use the glucose they produce to prevent infection from bacteria and viruse:
C. Green plants use the glucose they produce to carry out life processes such as growth an
D. Green plants use the glucose they produce as a raw material to continue the process of
PLEASE HELP ASAP 20 POINTS!! As the pH of ocean water decreases, it becomes more _____.
Question 2 options:
acidic
basic
Answer:
acidic
Explanation:
What is the formula for finding the molar mass of water?
A.mass of H + 2 + mass of O
B.mass of H x 2 + mass of O
C.mass of H + mass of O x 2
D.(mass of H + mass of O) x 2
Answer:
B is the answer to the questionTechnetium-104 has a half-life of 18.0 minutes. How much of a 165 g sample is left after 90.0 minutes?
Answer:
After 90 minutes 5.15625 g amount left from total of 165 g.
Explanation:
Given data:
Technetium-104 half life = 18.0 min
Total amount of sample = 165 g
Amount left after 90.0 min = ?
Solution:
First of all we will calculate the number of half lives passes.
Number of half lives = T elapsed / Half life
Number of half lives = 90 min /18.0 min
Number of half lives = 5
Amount left:
At time 0 = 165 g
At first half life = 165 g/ 2= 82.5 g
At 2nd half life = 82.5 g/2 = 41.2 g
At 3rd half life = 41.2 g/ 2 = 20.625 g
At 4th half life = 20.625 g/ 2 = 10.3125 g
At 5th half life = 10.3125 g /2 = 5.15625 g
Thus, after 90 minutes 5.15625 g amount left from total of 165 g.
Assess the following statements about fractional distillation. Determine which are TRUE/FALSE
a. Multiple vaporization-condensation cycles are needed to purify samples of relatively close boiling points.
b. The column efficiency of a fractionating column can be assessed by the HETP
c. With every condensation-vaporization cycle, the vapors become enriched in the higher boiling point component
d. A fractionating column is part of the apparatus set-up
The assessments of the given statements on the nature of the fluids and
the fractional distillation processes are as follows;
a. TRUE
b. TRUE
c. FALSE
d. A fractionating column is a glass piece that contains metal pieces or glass beads
What are the correct points regarding fractional distillation?Option a.
Multiple vaporization-condensation cycles enhances the separation of
the components of the mixture;
Thereby enabling purification of the samples that have boiling points
that are close.
Option a is therefore; TRUE
a. Multiple vaporization-condensation cycles are needed to purify samples of relatively close boiling points. TRUEOption b.
The Height Equivalent to Theoretical Plate, HETP, indicates the
efficiency of the separation, and the fractionating column.
Therefore, option b. is TRUE
b. The column efficiency of a fractionating column can be assessed by HETP. TRUEOption c.
After every condensation-vaporization cycle, the condensate contains
more of the more volatile, component and the vapor be comes enriched
in the lower boiling point component.
Therefore, option c is FALSE
c. With every condensation-vaporization cycle, the vapors become enriched in the higher boiling point component. FALSEOption d.
d. The location of a fractionating column is placed vertically between the
mixture to be separated and the 'Y' adaptor, and consist of a straight
tube containing pieces of metals or glass beads.
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