Answer:
e. the strong base reacts with HA to give A, which is a weak base
Explanation:
Let's consider a buffer made up of a weak acid, HA, and the sodium salt of its conjugate base, NaA. The function is a buffer system is to muffle the change in the pH when an acid or a base is added.
Let's suppose a strong base is added. Then, OH⁻ would be more available. OH⁻ ions react with the acid component of the buffer and its effect is reduced. The corresponding reaction is:
OH⁻ + HA ⇄ A⁻ + H₂O
As we can see, the strong base reacts with HA to give A, which is a weak base.
Physical weathering can result from the action of all of the following EXCEPT __________.
ice
burrowing by animals
carbon dioxide
plant roots
How many jouls are required to boiling 21.1 g of water at 100 c
Answer:
The needed heat is 47,65 Joules.
The number of Joules of heat is required to change the 21.1g of liquid water into steam at 100°C is 47686 Joules.
What is the latent heat of vaporization?The latent heat of vaporization is defined as the amount of heat needed at a constant temperature for the conversion of a liquid at its boiling point to gas. The latent heat of vaporization is different for different liquids.
The particles of water vapor at 100°C have more energy than that of liquid water. Because the extra energy is in the form of latent heat of vaporization. The word “latent” from the Latin word “latere" means to cover up or hide.
Given, the amount of water, m= 21.1 g
We know that, the heat of vapourization of water = [tex]2260 J/g[/tex]
The latent heat of vaporization (q) is calculated as:
q = mH
q = (21.1 g) × (2260J/g)
q = 47686 J
Therefore, the 47686 Joules are required to boil 21.1 g of water at a temperature of 100°C.
Learn more about latent heat of vaporization, here:
https://brainly.com/question/5401454
#SPJ5
Which of a following elements has the Smallest atomic radius 1. Ge 2. SI 3. Carbon 4. Sn
Answer:
carbon
Explanation:
Atomic radius represents the distance from the nucleus to the outer shell of an element.
The element having the Smallest atomic radius is Carbon. Hence. Option (3) is correct
What is Atomic Radius ?The atomic radius of a chemical element is a measure of the size of its atom, usually the mean or typical distance from the center of the nucleus to the outermost isolated electron.
Atomic Radius Increases down the group.
All the given elements belongs to same group ie, 14th Carbon is the top most element of the group.
Therefore, The element having the Smallest atomic radius is Carbon. Hence. Option (3) is correct
Learn more about Atomic radius here ;
https://brainly.com/question/13607061
#SPJ2
A spacecraft is traveling at a speed of 2.3 km/sec. It takes 2.5 minutes to pass a small asteroid. how wide is the asteroid (i.e., how far did the spacecraft travel during this time)? Use (distance) = (velocity) x (time)
Answer: The spacecraft traveled 345 km during the given time.
Explanation:
To calculate the distance of spacecraft, we use the equation:
[tex]\text{Velocity}=\frac{\text{Distance}{\text{Time}}[/tex]
We are given:
Velocity = 2.3 km/sec
Time = 2.5 mins = 150 sec (Conversion factor: 1 min = 60 sec)
Putting values in above equation, we get:
[tex]\text{Distance}=(2.3km/s\times 150s)=354km[/tex]
Hence, the spacecraft traveled 345 km during the given time.
Calculate the pH of a solution that is 0.205M benzoic acid and 0.230M sodium benzoate, a salt whose anion is the conjugate base of benzoic acid. (The pKa of benzoic acid
Answer:
pH = 4.25
Explanation:
A solution composed of a weak acid and its conjugate base is a buffer solution. To calculate the pH of a buffer solution we use the Henderson-Hasselbach equation:
pH = pKa + log ([conjugate base]/[weak acid]
In this case, we have the following data:
[conjugate base] = [sodium benzoate] = 0.230 M
[weak acid] = [benzoic acid] = 0.205 M
The pKa of benzoic acid is 4.2. So, we introduce the data in the equation:
pH = 4.2 + log (0.230 M/0.205 M) = 4.2 + 0.050 = 4.25
How many liters of water would you need to add to 4.36 moles of NaCl to create a 9.4 M solution?
Answer:
0.46 L
Explanation:
In order to solve this problem we need to keep in mind the following definition of molarity:
Molarity = Number of moles / litersWe now input the given number of moles and molarity:
9.4 M = 4.36 mol / litersAnd calculate how many liters are required:
liters = 4.36 mol / 9.4 Mliters = 0.46 Lbalance this equation plz
SO2+O2+H2O------->H2SO4
Answer: The balanced equation is [tex]2SO_{2} + O_{2} + 2H_{2}O \rightarrow 2H_{2}SO_{4}[/tex].
Explanation:
A chemical equation which contains same number of atoms on both reactant and product side is called a balanced chemical equation.
For example, [tex]SO_{2} + O_{2} + H_{2}O \rightarrow H_{2}SO_{4}[/tex]
Here, number of atoms present on reactant side are as follows.
S = 1O = 5H = 2Number of atoms present on product side are as follows.
S = 1O = 4H = 2To balance this equation, multiply [tex]SO_{2}[/tex] by 2 and [tex]H_{2}O[/tex] by 2 on reactant side. Also, multiply [tex]H_{2}SO_{4}[/tex] by 2 on product side.
Hence, the equation can be re-written as follows.
[tex]2SO_{2} + O_{2} + 2H_{2}O \rightarrow 2H_{2}SO_{4}[/tex]
Now, the number of atoms present on reactant side are as follows.
S = 2O = 8H = 4Number of atoms present on product side are as follows.
S = 2O = 8H = 4Since, the atoms present on both reactant and product side are equal. Hence, the equation is now balanced.
Thus, we can conclude that the balanced equation is [tex]2SO_{2} + O_{2} + 2H_{2}O \rightarrow 2H_{2}SO_{4}[/tex].
A student repeats a reaction several times to test the effects of various
changes on the reaction rate. The data table shows the results. How does
increasing the concentration of the reactants change the reaction rate?
5
Conditions
Reaction Time (5)
10 seconds
Original
Higher concentration
Higher temperature
5 seconds
5 seconds
Metal added
5 seconds
A. Increasing the concentration has no effect on the reaction rate.
B. Increasing the concentration decreases the reaction rate.
C. Increasing the concentration increases the reaction rate.
D. More information is needed to determine what happens to the
reaction rate.
Answer:
The correct answer is - C. Increasing the concentration increases the reaction rate.
Explanation:
In the given question the data with change in different factors affect the rate of reaction differently as it alters the time it takes to complete reaction:
Conditions Reaction Time
Original 10 seconds
Higher concentration 5 seconds
Higher temperature 5 seconds
Metal added 5 seconds
As it is given above, time is decreased in each condition including in the case of increasing the concentration of the reactants which means the rate of reaction increases as well.
The solubility of CaSO4 in pure water at 0oC is 1.09 gram(s) per liter. The value of the solubility product is g
Answer: See image attached!
Good luck with your future exams!
The value of the solubility of product for CaSO₄ in pure water at 0 °C is 1.1881
What is solubility of product?The solubility of product (Ksp) is defined as the concentration of products raised to their coefficient coefficients. This is illustrated below:
mA <=> nC + eD
Ksp = [C]^n × [D]^e
With the above information in mind, we can obtain the solubility of the product. This is illustrated below:
Dissociation equationCaSO₄(aq) → Ca²⁺(aq) + SO₄²⁻(aq)
From the balanced equation above,
1 mole of CaSO₄ contains 1 mole of Ca²⁺ and 1 mole of SO₄²⁻
How to determine the concentration of Ca²⁺ and SO₄²⁻From the balanced equation above,
1 mole of CaSO₄ contains 1 mole of Ca²⁺ and 1 mole of SO₄²⁻
Therefore,
1.09 g/L of CaSO₄ will also contain
1.09 g/L of Ca²⁺1.09 g/L of SO₄²⁻ How to determine the solubility of product Concentration of Ca²⁺ = 1.09 g/L Concentration of SO₄²⁻ = 1.09 g/L Solubility of product (Ksp) =?CaSO₄(aq) → Ca²⁺(aq) + SO₄²⁻(aq)
Ksp = [Ca²⁺] × [SO₄²⁻]
Ksp = 1.09 × 1.09
Ksp = 1.1881
Learn more about solubility of product:
https://brainly.com/question/4530083
How many moles of I2 are there in 5.34 x 1025molecules of I2 ?
Explanation:
pls the question is not clear to me
34. Which type of reaction is represented by the
equation?
CH. + Biz - CH.Br + HB,
A suhstitution
C. esterification
D. polymerization
Answer:
Option A. Substitution
Explanation:
To know which option is correct, let us define each option. This is illustrated below:
A substitution reaction is a reaction in which an halogen replaces hydrogen in a hydrocarbon to produce alkyl halide and the corresponding acid. For example:
RH + X₂ –> RX + HX
NOTE:
R => is an alkyl group
X => is an halogen (F₂, Cl₂, Br₂ or I₂)
Addition reaction is a reaction in which two reactants combined to form a new compound without any loss of the reactants. This reaction is peculiar to only unsaturated hydrocarbon. For example:
CₓHᵧ + A₂ —> ACₓHᵧA
NOTE:
CₓHᵧ => unsaturated hydrocarbon (alkene, alkyne)
A₂ => halogen (F₂, Cl₂, Br₂ or I₂) or HBr, HCl etc
Esterification is a reaction involving carbonxylic and alcohol to produce ester and water. For example:
RCOOH + HOR —> RCOOR + H₂O
NOTE:
R => is an alkyl group
Polymerization is a process of reacting smaller molecules called monomers to form a larger molecule called polymer.
With the information provided above, we can see that the reaction:
CH₄ + Br₂ —> CH₃Br + HBr
Is a substitution reaction since Br replaces H in CH₄ to produce CH₃Br and the corresponding acid i.e HBr
Can y’all please help me with these 2? I had surgery and missed this entire unit and it’s due Monday
Look at the picture and answer.
Answer:
In order to balance the chemical equation, you need to make sure the number of atoms of each element on the reactants side is equal to the number of atoms of each element on the product side. In order make both sides equal, you will need to multiply the number of atoms in each element until both sides are equal.
Hope this helped you.
What volume of water is required to prepare 0.1 M H3PO4 from 100 ml of 0.5 M solution?
Answer: A volume of 500 mL water is required to prepare 0.1 M [tex]H_{3}PO_{4}[/tex] from 100 ml of 0.5 M solution.
Explanation:
Given: [tex]M_{1}[/tex] = 0.1 M, [tex]V_{1}[/tex] = ?
[tex]M_{2}[/tex] = 0.5 M, [tex]V_{2}[/tex] = 100 mL
Formula used to calculate the volume of water is as follows.
[tex]M_{1}V_{1} = M_{2}V_{2}[/tex]
Substitute the values into above formula as follows.
[tex]M_{1}V_{1} = M_{2}V_{2}\\0.1 M \times V_{1} = 0.5 M \times 100 mL\\V_{1} = 500 mL[/tex]
Thus, we can conclude that a volume of 500 mL water is required to prepare 0.1 M [tex]H_{3}PO_{4}[/tex] from 100 ml of 0.5 M solution.
What mass of zinc (molar mass 65.4 g moll) does it take to produce 0.50 mole of H2(g)?
Answer:
32.7 g of Zn
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
Zn + 2HCl —> ZnCl₂ + H₂
From the balanced equation above,
1 mole of Zn reacted to produce 1 mole of H₂
Next, we shall determine the number of mole of Zn required to produce 0.5 mole of H₂. This can be obtained as follow:
From the balanced equation above,
1 mole of Zn reacted to produce 1 mole of H₂.
Therefore, 0.5 mole of Zn will also react to produce to 0.5 mole of H₂.
Thus, 0.5 mole of Zn is required.
Finally, we shall determine the mass of 0.5 mole of Zn. This can be obtained as follow:
Mole of Zn = 0.5 mole
Molar mass of Zn = 65.4 g/mol
Mass of Zn =?
Mass = mole × molar mass
Mass of Zn = 0.5 × 65.4
Mass of Zn = 32.7 g
Thus, 32.7 g of Zn is required to produce 0.5 mole of H₂.
What is temperature?
Answer:
Temperature is a physical quantity that shows how hot and cold something is.
It is the sign of thermal energy, present in all matter, which is the source of the occurrence of heat, a flow of energy when a body is in contact with another that is colder or hotter. Temperature is measured with a thermometer.
During the synthesis of esters from carboxylic acids and alcohols, the carboxylic acid is often in excess to push the equilibrium towards the products. This is because it is easier to separate the acid from the product. Describe a method to separate an ester from a carboxylic acid.
Answer: FRACTIONAL DISTILLATION separation method
Explanation:
The process by which esters are synthesized involves the reaction between a carboxylic acid and an alcohol. During this process, an excess of one of the reactants which is carboxylic acid is used. This helps to increase the rate of the chemical reaction thereby moving the equilibrium constant of the reaction towards the products.
Excess carboxylic acid mixed with the product of the reaction which is an ester can be separated using FRACTIONAL DISTILLATION separation method. This is a separation method that is used for separation of liquids with close boiling points. Example include components of petroleum, alcohol and water solutions, mixture of esters and carboxylic acids.
The process involves the introduction of a fractionating column between a flask and a condenser. The flask, which contains the impure mixture to be separated, is heated. The vapour of the liquids move into the fractionating column and they are cooled by the glass surface. The liquid with the higher boiling point (less volatile) condenses and falls back into the flask. While the one with the lower boiling point ( more volatile) distils over into the condenser and is collected as the first distillate. The esters has lower boiling point than carboxylic acids, therefore they are collected as the first distillate.
Walking on sand with your bare feet demonstrate what kind of heat transfer
Answer:
It would be conduction.
HURRRYYY !!!!!
Which of these statements best describe how Kennedy Space Center benefits Florida? It helps to
decrease immigration in Florida.
increase unemployment in Florida.
decrease the income from sale of goods in Florida.
increase Florida's average income per person.
Answer:
The correct answer is - increase Florida's average income per person.
Explanation:
Kennedy Space Center established by NASA helped the boosting economy of Florida. Spaceport operations in Kennedy Space Center benefit Florida by a total economic impact of nearly $4 billion on Florida's economy.
This space center helped in the 7,639 jobs in 2018 and 2019 and 37 new space operation companies. These jobs increased Florida's average income per person above $91,000.
water molecules stick to nearby water molecules due to
STRONGEST METALL ON EARTH
Answer:
tungstun
Explanation:
Answer:
tungsten
Explanation:
strongest out of any natural metal (142,000 psi).
Which of the following numbers is in scientific notation?
A~ 13.5 x 10^14
B~ 1.35 x 10^14
C~ 1.35 x 9^14
D~ 13.5 x 9^14
If element R has 2 valence electron and element Q has 6 valence electrons, what is the likely compound that will form:
Explanation:
Sydney has been the work that is a great place 56 to be able and a day and day for a week or two types and we will have a very nice time of course but 6yy6667 has 7575665yy44y
Given the following: 30 grams of H3PO4, find the number of moles
Answer:
Number of mole of H₃PO₄ = 0.306 mole
Explanation:
From the question given above, the following data were obtained:
Mass of H₃PO₄ = 30 g
Number of mole of H₃PO₄ =?
Next, we shall determine the molar mass of H₃PO₄. This can be obtained as follow:
Molar mass of H₃PO₄ = (3×1) + 31 + (4×16)
= 3 + 31 + 64
= 98 g/mol
Finally, we shall determine the number of mole in 30 g of H₃PO₄ as follow:
Mass of H₃PO₄ = 30 g
Molar mass of H₃PO₄ = 98
Number of mole of H₃PO₄ =?
Mole = mass / molar mass
Number of mole of H₃PO₄ = 30 / 98
Number of mole of H₃PO₄ = 0.306 mole
(2pts) During the Purification of Lactate Dehydrogenase (LDH) experiment, you will need 50ml of buffer A150. Buffer A150 is 30mM Tris (pH 8.8) and 150mM NaCl. Given 1L of 1.5M Tris and 500ml of 5M NaCl, how much of each stock do you need to make 250ml of the A150 buffer
Answer:
The answer is "[tex]20 \ mL[/tex]"
Explanation:
Given:
Molarity= number of moles
because it is 1 Liter
[tex]\to \frac{0.03\ moles}{1.5 moles}=0.02\ L= 20 \ mL \ of\ Tris\\\\[/tex]
therefore,
it takes 20 mL of Tris.
[tex]\to \frac{0.150 \ moles}{5\ moles} =0.03\ L\\\\[/tex]
[tex]= 30 \ mL \ of\ Nacl[/tex]
So, take [tex]20 \ mL\ of\ NaCl.[/tex]
At about what age does basal metabolic rate begin to gradually decrease?
15
25
30
45
Answer:
at age 15 the BMR begin to gradually decrease
May you please help me solve these three equations?
Please explain your work.
Any spam or link will be reported.
Thank you.
Answer:
1. 12 molecules
2. 10 grams
3. ?
Explanation:
for number one, you simply. multiblu the 02 by 6 an that is 12, the same goes for number two. now for the third one i di not know. i am sorry and i hope this helps.
A diagram representing the levels of organization within an organism is shown below.
Х
-5-
Which level of organization is dentified by X?
(1) cell
(2) tissue
(3) organ
(4) organ system
A diagram representing the levels of organization within an organism is X. The level of organization is identified by X is tissue. Therefore, option 2 is correct.
What is tissue ?The term "tissue" refers to a collection of cells or fluid that cooperate to carry out a particular function in the body. Examples of such cells include those found in the kidney, heart, or blood cells, which transport oxygen to and waste products away from the body's cells.
The Old French term tissue, which means "a ribbon, belt, or piece of woven stuff," is where the noun tissue originates. Tissue really means to "weave fabric strands" as a verb. Tissues are now thought of as the disposable paper used for packaging presents or blowing our noses.
They stand for a degree of cell differentiation and order in living things. The activities of tissues include respiration, digesting, and transportation. As a result, tissues are crucial for multicellular creatures.
Thus, option 2 is correct.
To learn more about tissue, follow the link;
https://brainly.com/question/17664886
#SPJ2
Choose one:____.
A. FeBr3 is the Lewis acid, and FeBr4-1 is the Lewis base.
B. FeBr4-1 is the Lewis acid, and Br 1 is the Lewis base.
C. Br 1 is the Lewis acid, and FeBr4-1 is the Lewis base.
D. FeBr3 is the Lewis acid, and Br2 is the Lewis base.
E. Br 1 is the Lewis acid, and FeBr4-1 is the Lewis base.
F. FeBr4-1 is the Lewis acid, and FeBr3 is the Lewis base.
Answer:
FeBr3 is the Lewis acid, and FeBr4-1 is the Lewis base.
Explanation:
A Lewis acid is any specie that has empty orbitals into which it can receive a lone pair of electrons.
A Lewis base is any specie that donates a lone pair of electrons to another to form a dative covalent bond.
If we look at the species listed in the options, FeBr3 is lone pair acceptor hence it is a Lewis acid while FeBr4- is a lone pair donor hence it is Lewis base.
What mass of magnesium nitrate contains 500g of nitrate?
Answer:
98
Explanation:
I dont even know