Answer:
1. pOH = 2.4
2. pOH = 10.34
3. pH = 2.14
Explanation:
1. Determination of the pOH.
Concentration of Hydroxide ion, [OH-] = 0.004 M
pOH =?
pOH = - log [OH-]
pOH = - log (0.004)
pOH = 2.4
Therefore, the pOH of the solution is 2.4
2. Determination of the pOH.
pH = 3.66
pOH =?
pH and pOH are related by the following equation:
pH + pOH = 14
With the above formula, we can obtain the pOH of the solution as follow:
pH = 3.66
pOH =?
pH + pOH = 14
3.66 + pOH = 14
Collect like terms
pOH = 14 - 3.66
pOH = 10.34
Therefore, the pOH of the solution is 10.34
3. Determination of the pH.
Molarity of HCl = 0.0072 M
Concentration of Hydrogen ion, [H+] =?
Thus, we can obtain the concentration of Hydrogen ion, [H+] as follow:
HCl(aq) —> H+(aq) + Cl-(aq)
From the balanced equation above,
1 mole of HCl produced 1 mole of H+.
Therefore, 0.0072 M HCl will also produce 0.0072 M H+.
Therefore, the concentration of Hydrogen ion, [H+] in the solution is 0.0072 M.
Finally, we shall determine the pH of the solution as follow:
Concentration of Hydrogen ion, [H+] = 0.0072 M.
pH =?
pH = - log [H+]
pH = - log (0.0072)
pH = 2.14
Therefore, the pH of the solution is 2.14
A solution is prepared at that is initially in benzoic acid , a weak acid with , and in sodium benzoate . Calculate the pH of the solution. Round your answer to decimal places.
Answer:
[tex]pH=4.1[/tex]
Explanation:
Hello,
In this case, for a concentration of 0.42 M of benzoic acid whose Ka is 6.3x10⁻⁵ in 0.33 M sodium benzoate, we use the Henderson-Hasselbach equation to compute the required pH:
[tex]pH=pKa+log(\frac{[base]}{[acid]} )[/tex]
Whereas the concentration of the base is 0.33 M and the concentration of the acid is 0.42 M, thereby, we obtain:
[tex]pH=-log(Ka)+log(\frac{[base]}{[acid]} )\\\\pH=-log(6.3x10^{-5})+log(\frac{0.33M}{0.42M} )\\\\pH=4.1[/tex]
Regards.
Some people argue that a policy of putting out wildfires is having a negative long-term effect on the number and strength of wildfires. Suggest why this could be the case.
Answer:
The reason for this is that putting out the fires only postpones the fire outbreak to a later date, and there is the fear of the fire outbreak being more sever when it actually comes.
When wildfires burn, they clean up the forest off dead trees and falling logs. Also dried leaves and twigs and unnecessarily dense vegetation is cleared up by the fire. These materials are the main fuel of these wildfires. Putting out these fires, especially those that start naturally means that these fuel that should be cleaned up are allowed to accumulate so that when the fire actually happens, it does so with an unnatural intensity. Also, when fire burns, the ashes that are left act as nutrition for the forest, and the forest is allowed to regrow; reborn from the ashes. The only cases that might need human intervention is when the fire is human caused or due to human activities. Natural causes of fire can be due to a very high temperature, lightning striking a tree, etc.
Show the difference in the reactivity of Na,Ca,Mg,Al,Fe,Cu with H2O
Answer:
Explanation:
Na react with H2O to form NAOH
2 Na+2H2O....................2NAOH + H2
Ca react with water and form calcium hydroxide
Ca + 2H2O........................Ca(OH)2
Mg react with water and form Magnesium hydroxide
Mg +2H2O .........................Mg(OH)2 however this coating of mg(oh)2 prevent it from further reaction
Fe react with water and form ferric hydride
3Fe +H2O.......................2 FeH +FeO
copper do not react with water
Write the numbers in scientific notation.
291.7 = 2.917
X10%
where x =
0.0960 -
X10%
where x =
The numbers in scientific notation are 291.7 = 2.917 × 10₂ and 0.0960 = 9.60 × 10⁻².
Scientific notation is commonly used in scientific and mathematical calculations, as well as when dealing with very large or very small numbers. It allows for a more compact and manageable representation of these numbers.
To write the numbers in scientific notation, we need to express them in the form of "a × 10^b," where "a" is a number between 1 and 10, and "b" is an integer.
For the number 291.7, write it in scientific notation as:
291.7 = 2.917 × 10²
For the number 0.0960, write it in scientific notation as:
0.0960 = 9.60 × 10⁻²
To learn more about scientific notation, follow the link:
https://brainly.com/question/19625319
#SPJ6
How does the amount of sunlight affect the number of eggs laid by a chicken?
Explanation:
The amount of daylight hours affects a chicken's reproductive cycle. Hens will begin laying when the amount of daylight reaches 14 hours per day during early spring. Maximum egg laying will occur when the day length reaches 16 hours per day
Which of the following correctly describes a mixture? (4 points) a The particles are chemically bonded together, and they retain their individual physical and chemical properties. b The particles are not chemically bonded, and they can only combine in certain set ratios. c The particles do not retain their individual chemical properties, and they can only be separated by chemical means. d The particles have no set ratio for how to combine, and they can be separated by physical means.
Answer:
the answer is B the particles are not chemically bonded, they can only be combined in a certain set ratios
Explanation:
Adding charts and graphs helps a scientist
O To state the problem
O To determine trends
O To simplify results
O Both B and C
O All of the above
Answer:
b and c
Explanation:
the problem was solved through the experiment and tested
How many mL are in 1.000 cup?
Answer:
236588
Explanation:
1000 x 237 for an approx. amount
Answer:
236.588 mL in 1 cup.
Explanation:
For this problem, you must know that 1 cup is equal to 8 ounces and that 1 ounce is 29.5735 mL. Using this information, let' perform the conversion.
1 cup * ( 8 oz / 1 cup ) * ( 29.5735 mL / 1 oz) == ? mL
( 1 cup * 8 oz * 29.5735 mL ) / ( 1 cup * 1 oz) == ? mL
236.588 mL == ? mL
Hence, there are 236.588 mL in 1 cup.
Cheers.
Calculate the density of an object with a mass of 220 and a volume of 145mL.
Answer:
1.52 g/mL
Explanation:
The formula for finding the density of an object is d = m/v, or density = mass divided by volume.
Therefore, we can input the two values and solve for d.
d = 220/145
d = 44/29
d ≈ 1.52 g/mL
20g of ideal gas contains only atoms of s and o occupies 5.6l at ntp what is the mol wt of gas
Answer:
20g gas contains and this so allow in tha 36G in per laar
Explanation:
At STP how many liters of NH3 can be produced from the reaction of 2.00 mol of N2 with 2.00 mol of H2
Answer:
29.9L of NH₃ are produced
Explanation:
The reaction of H2 with N2 to produce NH3 is:
3 H2 + N2 → 2 NH3
For a complete reaction of 2.00 moles of H2 there are required:
2.00 moles H2 * (1 mole N2 / 3.00 moles H2) = 0.667 moles N2
The limiting reactant is hydrogen.
The volume of hydrogen using PV = nRT is (STP: 273.15K; 1atm):
V = nRT / P
V = 2.00mol * 0.082atmL/molK*273.15K / 1atm
V = 44.8L
As we know for the reaction, 3 moles of hydrogen produce 2 moles of NH3.
The moles of H2 produced are:
2mol H2* (2mol NH3 / 3mol H2) = 1.33 moles NH3 are produced
Under pressure and temperature constant (STP) you can apply The Avogadro's law that states:
V₁ / n₁ = V₂ / n₂
Where V is volume and n moles of 1, the first gas and 2, the second gas.
V₁ / n₁ = V₂ / n₂
44.8L / 2.00mol = V₂ / 1.33 moles
V₂ =
29.9L of NH₃ are produced
A block of aluminum occupies a volume of 0.015 L and has a mass of 40.5 g. What is its density
Answer:
Density = 2700 g/LExplanation:
Density of a substance can be found by using the formula
[tex]Density = \frac{mass}{volume} [/tex]
From the question
volume = 0.015 L
mass = 40.5 g
Substitute the values into the above formula and solve for the Density
That's
[tex]Density = \frac{40.5}{0.015} [/tex]
We have the final answer as
Density = 2700 g/L
Hope this helps you
2The higher the numbers on the NFPA diamond, the more _____ the substance is.
ARare incorrect answer
BDangerous incorrect answer
CPure incorrect answer
DSafe
The correct answer is B. Dangerous
Explanation:
The NFPA diamond is used to show how safe or dangerous a substance or material is based on four main categories: Health (blue), Flammability (red), Instability (yellow), special hazards (white). Moreover, the three first hazards are expressed using numbers from 0 to 4, in which 0 means no hazard while 4 is the most dangerous category. For example, in the health square finding 0 means the substance represents no hazard for health, while 4 means the substance is lethal. This means the higher the number in this diamond, the most dangerous the substance is.
Johnny was finished with his
experiment so he placed all of his
unused chemicals back into their
original containers. What should
Johnny have done instead?
The sono
A 1.000 g sample of nitrogen combined with a 0.0720 g sample of hydrogen to form N2H2. What compound is formed if 1.000 g of nitrogen combines with 0.2160 g of hydrogen?
N2H6 NH3 NH4+ N4H4
Answer:
N₂H₆
Explanation:
A 1.000 g sample of nitrogen combined with a 0.0720 g sample of hydrogen to form N₂H₂ .
1.000 g of nitrogen combines with 0.2160 g of hydrogen in the next compound .
In this compound the component of nitrogen remains the same but the component of hydrogen becomes .2160 / .0720 = 3 times .
Hence component of hydrogen in the new compound will change from
H2 to H6 .
Hence the chemical formula of new compound will be
N₂H₆ .
For the reaction2 C4H10 (g) + 13 O2 (g) → 8 CO2 (g) + 10 H2O (g)ΔH° is -125 kJ/mol and ΔS° is +253 J/K ∙ mol. This reaction is ____.A. spontaneous only at low temperatureB. spontaneous only at high temperatureC. spontaneous at all temperaturesD. nonspontaneous at all temperaturesE. unable to determine without more information
Answer:
C. spontaneous at all temperatures
Explanation:
The spontaneity of reaction is determined by the sign of the gibbs free energy.
A negative sign denotes that the reaction is spontaneous, positive sign means the reaction is not spontaneous.
From the question;
ΔS° = +253 J/K
ΔH° = -125 kJ/mol
ΔG = ΔH° - TΔS°
From the data given, the condition in which we can obtain a negative value of G, is at any value of T.
For any value of T, G would always be a negative value.
This means the correct option is option C.
is another way in which nitrogen gets fixed in the soil
Answer:
through Rhizobium bacteria
John had seen people sprinkle salt on ice in the winter. The salt appeared to melt the ice. He decided to sprinkle salt on a larger block of ice. Then he added food coloring so he better could see the results. How did creativity help John in this experiment? A. It helped him use materials in a new way to help him gather data. B. It helped him reason through the results of his experiments. C. It helped him follow the steps of the procedure precisely. D. It helped him remember something from his past.
The correct answer is A. It helped him use materials in a new way to help him gather data.
Explanation:
The use of food coloring in this experiment makes it easier to observe how salt affects ice and if this helps ice to melt. This implies by adding food coloring John can better observe the phenomenon he is studying and gather precisely data about this phenomenon, which would also help him to draw accurate conclusions. In this context, the use of food coloring shows creativity because he is using this material as an alternative way and this use would help him in the stage of gathering data (option A), which is the stage that follows after implementing experiments.
Answer:
A
Explanation:
Just got it right on my quiz!! I hope this helps! <3
Anatomy+ Chemistry List the 8 common ions in the human body and their charge. Identify each as a cation or anion.
Answer:
Sodium ions - Na⁺ - cation
Potassium ions - K⁺ cation
Chloride ions - Cl⁻ anion
Magnesium ions - Mg²⁺ cation
Calcium ions - Ca²⁺ cation
Phosphate ions - P³⁻ anion
Iron ions - Fe²⁺ cation
Zinc ions - Zn⁺ cation
Explanation:
Following is a list of 8 common but essential ions in the cells and fluids of human bodies:
1. Sodium ions helps in regulation and control the level of body fluids
2. Potassium ions help regulate cellular functions
3. Calcium ions are essential for building and maintaining strength bones and teeth. and have role in blood clotting, muscle contraction, and the transmission of nerve signals to cells.
4. Chloride ions are the main anions found outside body cells. They acts as counterions
5. Magnesium ions present in the bones
6. Phosphate ions present in body fluids act as the counterions.
7. Iron
8. Zinc
So our professor didn't go over this but is freshly cut sodium, but rapidly tarnishes on contact with air a physical or chemical property?
Answer:
Hey!
After the slight confusion (haha)...
Your answer should be a CHEMICAL CHANGE / PROPERTY
Explanation:
Its CHEMICAL because the sodium has reacted with the air (oxygen in technical terms) which then forms SODIUM OXIDE...the tarnishing of the cut sodium surface it a thin layer of the SODIUM OXIDE...
HOPE THIS HELPED!
What volume (mL) of a 0.3428 M HCl(aq) solution is required to completely neutralize 23.55 mL of a 0.2350 M Ba(OH)2(aq) solution
Answer:
32.29 mL
Explanation:
We'll begin by writing the balanced equation for the reaction. This is given below:
2HCl(aq)+ Ba(OH)2(aq) —> BaCl2(aq) + 2H2O
From the balanced equation above, the following were obtained:
Mole ratio of the acid (nA) = 2
Mole ratio of the base (nB) = 1
Next, data were obtained from. This include the following:
Molarity of acid, HCl (Ma) = 0.3428 M
Volume of acid, HCl (Va) =.?
Molarity of base, Ba(OH)2 (Mb) = 0.2350 M
Volume of base, Ba(OH)2 (Vb) = 23.55 mL
Finally, we shall determine the volume of the acid, HCl required for the reaction as follow:
MaVa /MbVb = nA/nB
0.3428 × Va / 0.2350 × 23.55 = 2/1
Cross multiply
0.3428 × Va = 0.2350 × 23.55 × 2
Divide both side by 0.3428
Va = (0.2350 × 23.55 × 2) / 0.3428
Va = 32.29 mL
Therefore, the volume of acid, HCl required for the reaction is 32.29 mL
g The large negative free energy of hydrolysis of Phosphoenolpyruvate is largely due to _______________ of the enol pyruvate.
Answer:
hello your question lacks some parts below are the missing option
A. hydrophobic interaction
B. nucleophilic attack
C. tautomerization
D. resonance
answer : Tautomerization ( C )
Explanation:
The large negative free energy of hydrolysis of Phosphoenolpyruvate is largely due to tautomerization of the enol pyruvate. tautomerism of enol takes place by transferring proton from in an intramolecular way.
one of the most common tautomerism is keto-enol which makes uses of either an acid or base as a catalyst
A sample of mass 6.814 grams is added to another sample weighing 0.08753 grams.
The subsequent mixture is then divided into exactly 3 equal parts. One of those parts has the yield multiplied by 7.6335 times; what is the final mass?
Answer:
17.5609g
Explanation:
According to the question, a sample of mass 6.814 grams is added to another sample weighing 0.08753 grams. That is weight of sample 1 + weight of sample 2;
6.814 + 0.08753 = 6.90153grams
Next, the subsequent mixture is then divided into exactly 3 equal parts i.e. 6.90153grams divided by 3
= 6.90153/3
= 2.30051grams.
One of the equal parts is 2.30051grams, which is then multiplied by 7.6335 times I.e. 2.30051 × 7.6335 = 17.5609grams
Therefore, the final mass is 17.5609grams
Why is Hydrogen Peroxide lethal to drink if it is only composed of one more molecule of oxygen than water?
Answer: Hydrogen peroxide is a clear, odorless, and colorless liquid consisting of hydrogen and oxygen. It’s available in dilutions ranging from 3–90%, some of which are sometimes used as an alternative health remedy.
Advocates suggest that drinking a few drops of hydrogen peroxide diluted in water may help treat a range of illnesses, including diabetes and even some forms of cancer.
However, medical professionals warn against the dangers of this practice.
This article takes a look at the latest evidence to determine whether the benefits of drinking hydrogen peroxide outweigh its potential risks.
Explanation:
If you have ingested small amounts of 3% hydrogen peroxide, call your local poison control helpline for assistance. If you have swallowed larger amounts or higher concentrations, seek immediate medical assistance from an emergency room.
The bottom line
Hydrogen peroxide is touted as an alternative health remedy for a range of health conditions.
However, there’s no scientific evidence that drinking it yields any benefits. Plus, doing so is linked to dangerous side effects, including breathing problems, severe gut damage, and in some cases, death.
For these reasons, drinking any concentration or amount of hydrogen peroxide is not recommended.
A 1.75 gram perfect cube of wood has a side measure of 2.45 cm, what is the density of the wood?
Answer:
0.119 g/cm³
Explanation:
Step 1: Given data
Mass of the cube (m): 1.75 g
Side measure (l): 2.45 cm
Step 2: Calculate the volume of the cube
We will use the following expression.
V = l³
V = (2.45 cm)³
V = 14.7 cm³
Step 3: Calculate the density (ρ) of the cube
The density of the cube is equal to its mass divided by its volume.
ρ = m/V
ρ = 1.75 g/14.7 cm³
ρ = 0.119 g/cm³
classify the organisms based on what they eat. producer consumer decomposer
Lowest - Producer - plants (mostly)
They get food by converting sunlight into nutrients
Middle - Consumer - example animals
They eat other living things such as plants or other animals for their nutrients
Top - Decomposer - bacteria/microorganisms
They decompose dead body
sorry if im wrong
When dipentyl ether is treated with HI, what type of reaction occurs? both SN1 and SN2 SN2 E1 SN1 E2
Answer:
SN2
Explanation:
The first step of ether cleavage is the protonation of the ether since ROH is a better leaving group than RO-.
The second step of the reaction may proceed by either SN1 or SN2 mechanism depending on the structure of the ether. Methyl and primary ethers react with HI by SN2 mechanism while tertiary ethers react with HI by SN1 mechanism. Secondary ethers react with HI by a mixture of both mechanisms.
Dipentyl ether is a primary ether hence when treated with HI, the reaction with HI proceeds by SN2 mechanism as explained above.
sort the sequences based on the types of mutation they display
Answer:
There are three types of DNA Mutations: base substitutions, deletions and insertions. Single base substitutions are called point mutations, recall the point mutation Glu -----> Val which causes sickle-cell disease. Point mutations are the most common type of mutation and there are two types.
The composition of a liquid-phase reaction 2A - B was monitored spectrophotometrically. The following data was obtained: t/min 0 10 20 30 40 conc B/(mol/L) 0 0.089 0.153 0.200 0.230 0.312
1) Determine the order of the reaction. (6 pts.)
2) Find its rate constant. 19 pts.) Note: no unit is needed, just the numerical answer. Hint: convert your minutes to seconds.
Answer:
1) The order of the reaction is of FIRST ORDER
2) Rate constant k = 5.667 × 10 ⁻⁴
Explanation:
From the given information:
The composition of a liquid-phase reaction 2A - B was monitored spectrophotometrically.
liquid-phase reaction 2A - B signifies that the reaction is of FIRST ORDER where the rate of this reaction is directly proportional to the concentration of A.
The following data was obtained:
t/min 0 10 20 30 40 ∞
conc B/(mol/L) 0 0.089 0.153 0.200 0.230 0.312
For a first order reaction:
[tex]K = \dfrac{1}{t} \ In ( \dfrac{C_{\infty} - C_o}{C_{\infty} - C_t})[/tex]
where :
K = proportionality constant or the rate constant for the specific reaction rate
t = time of reaction
[tex]C_o[/tex] = initial concentration at time t
[tex]C _{\infty}[/tex] = final concentration at time t
[tex]C_t[/tex] = concentration at time t
To start with the value of t when t = 10 mins
[tex]K_1 = \dfrac{1}{10} \ In ( \dfrac{0.312 - 0}{0.312 - 0.089})[/tex]
[tex]K_1 = \dfrac{1}{10} \ In ( \dfrac{0.312 }{0.223})[/tex]
[tex]K_1 =0.03358 \ min^{-1}[/tex]
[tex]K_1 \simeq 0.034 \ min^{-1}[/tex]
When t = 20
[tex]K_2= \dfrac{1}{20} \ In ( \dfrac{0.312 - 0}{0.312 - 0.153})[/tex]
[tex]K_2= 0.05 \times \ In ( 1.9623)[/tex]
[tex]K_2=0.03371 \ min^{-1}[/tex]
[tex]K_2 \simeq 0.034 \ min^{-1}[/tex]
When t = 30
[tex]K_3= \dfrac{1}{30} \ In ( \dfrac{0.312 - 0}{0.312 - 0.200})[/tex]
[tex]K_3= 0.0333 \times \ In ( \dfrac{0.312}{0.112})[/tex]
[tex]K_3= 0.0333 \times \ 1.0245[/tex]
[tex]K_3 = 0.03412 \ min^{-1}[/tex]
[tex]K_3 = 0.034 \ min^{-1}[/tex]
When t = 40
[tex]K_4= \dfrac{1}{40} \ In ( \dfrac{0.312 - 0}{0.312 - 0.230})[/tex]
[tex]K_4=0.025 \times \ In ( \dfrac{0.312}{0.082})[/tex]
[tex]K_4=0.025 \times \ In ( 3.8048)[/tex]
[tex]K_4=0.03340 \ min^{-1}[/tex]
We can see that at the different time rates, the rate constant of [tex]k_1, k_2, k_3, and k_4[/tex] all have similar constant values
As such :
Rate constant k = 0.034 min⁻¹
Converting it to seconds ; we have :
60 seconds = 1 min
∴
0.034 min⁻¹ =(0.034/60) seconds
= 5.667 × 10 ⁻⁴ seconds
Rate constant k = 5.667 × 10 ⁻⁴
Cell membranes are largely hydrophobic structures. Which compound will pass through a membrane more easily, glucose or 2,4-dinitrophenol? Explain.
Answer:
2,4-dinitrophenol
Explanation:
A hydrophobic molecule does not dissolve nor mix with water. The cell membranes are made up of hydrophobic lipids. Hence, hydrophobic molecules easily pass through the cell membrane.
Glucose is partly hydrophilic hence it is transported across the cell membrane by special proteins. However, 2,4-dinitrophenol is a hydrophobic molecule thus it is easily transported across the cell membrane.