In the laboratory, a general chemistry student measured the pH of a 0.341 M aqueous solution of benzoic acid, C6H5COOH to be 2.351. Use the information she obtained to determine the Ka for this acid.
Answer: [tex]K_a[/tex] for the acid is [tex]5.75\times 10^{-5} [/tex]
Explanation:
[tex]C_6H_5COOH\rightarrow H^+C_6H_5COO^-[/tex]
cM 0 0
[tex]c-c\alpha[/tex] [tex]c\alpha[/tex]
So dissociation constant will be:
[tex]K_a=\frac{(c\alpha)^{2}}{c-c\alpha}[/tex]
Give c= 0.341 M and = 2.351
[tex]K_a=?[/tex]
[tex]pH=-log[H^+][/tex]
[tex][H^+]=10^{-2.351}=0.0044[/tex]
[tex][H^]=c\alpha=0.0044[/tex]
[tex]K_a=\frac{(0.0044)^{2}}{0.341-0.0044}[/tex]
[tex]K_a=5.75\times 10^{-5} [/tex]
Thus [tex]K_a[/tex] for the acid is [tex]5.75\times 10^{-5} [/tex]
What is an ionic solid?
Explanation:
In chemistry, an ionic compound is a chemical compound composed of ions held together by electrostatic forces termed ionic bonding. The compound is neutral overall, but consists of positively charged ions called cations and negatively charged ions called anions.
which of the following is an example of a chemical change?
cutting a log 2.
dissolving sugar
baking a cake
boiling water
Answer: Baking a Cake
Answer:
Baking a cake
Explanation:
Ape-x aprroved
What is the formal charge on the phosphorus in the PO43- polyatomic ion?
Answer:
P has a formal charge of 0
Explanation:
Essentially P is in the middle of that ion, and its valence electrons are being used with the 4 Os. Hope that makes sense or helps at least. There's good videos that talk about how this works but I can't link them in brainly
In alpha decay, the parent nucleus loses an alpha particle, which is two protons and two neutrons.
a. True
b. False
Answer:
True
Explanation:
In an alpha decay, the isotope of an element releases two protons and two neutrons. An alpha particle or helium has two protons and two neutrons and hence, in an alpha decay an alpha particle is released.
Hence, the given statement is true
The temperature of 100. g of water at 25.0C increases to 31.9C. How much energy was added to the water? The specific heat of water is 4.184J/gC.
Answer:
2890j
Explanation:
Which ecosystem is the least stable?
A. A rain forest
B. A cornfield
C. A savanna
D. A coral reef
Lithium arsenate (Li3AsO4) and iron nitrate (Fe(NO3)3) are dissolved in water. What precipitate would you expect to form? Write the name and formula. (use the solubility table to help)
Salts with nitrates as the anion are generally soluble in water. The question isn’t quite clear: Are we being asked what precipitate would form if these solutions were mixed together? If that’s the case, the reaction would be as follows:
Li3AsO4(aq)+ Fe(NO3)3(aq) → 3LiNO3(aq) + FeAsO4(s).
It is odd that we’re given lithium arsenate dissolved in water to begin with as lithium arsenate should be insoluble. But assuming that it is water-soluble, we can obtain the net ionic equation for the formation of our precipitate:
Fe3+(aq) + [AsO4]3-(aq) → FeAsO4(s).
Our precipitate would be iron(iii) arsenate, FeAsO4.
Chrysanthemic acid occurs as a mixture of esters in flowers of the chrysanthemum (pyrethrum) family.
a. True
b. False
Answer:
A: True
Explanation:
Statement is true because chrysanthemic acid is formed naturally as a result of production of two molecules of dimethylallyl diphosphate which forms pyrophosphate ester.
Thus, it belongs to the pyrethrum family
A sample of aluminum foil contains 9.20 x 1023 atoms. What is the mass of the foil?
A sample of aluminum foil contains 9.20 x 1023 atoms, then mass of foil will be 41.24 gram.
Aluminum foil serves as a barrier to air and oxygen, which could heat up food that is cold or frozen. In the end, it is beneficial since it keeps the food's temperature, irrespective of whether it's warm or cold.
Iron and silicon make up the majority of the remaining 2.5% of aluminum foil, which gives it strength as well as puncture resistance. Between big, water-cooled chilling rollers, the molten alloy has been rolled thin as well as solidified. Two layers of foil were run through the mill simultaneously even during final rolling.
It is known that 1 mol = 6.022 × [tex]10^{23}[/tex]
and, 1 mol of aluminum = 27 g.
It is given that, count of Al atoms = 9.20 × [tex]10^{23}[/tex]
So, 9.20 × [tex]10^{23}[/tex] particle has mass = 27 / 6.022 × [tex]10^{23}[/tex] × 9.20 × [tex]10^{23}[/tex]
Which will be equal to 41.24gram.
Therefore, the mass of foil will be 41.24 gram.
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Did entropy increase or decrease?
1) 2 SO3 (g) → 2 SO2 (g)+O2 (g)
2) MgCO3 (s) + 2 H3O^+ (aq) → Mg^2+ (aq) + 3 H2 O(I) + CO2 (g)
Answer:
1) increase
2) increase
Explanation:
Entropy is the degree of disorderliness or randomness of a system. It is the measure of the unavailable energy in a system.
Entropy increases with increase in the number of particles. If the number of particles in a system increases from left to right, the entropy of the system increases accordingly.
In reaction 1, the number of particles from left to right increased from two to three hence the entropy was increased.
In reaction 2, the number of particles from left to right increased from three to five hence the entropy was increased.
Please help with this thanks
Answer:
7. Convection
8. Radiation
9. Conduction
Explanation:
Convection is when a fluid, such as air or a liquid, is heated and then travels away from the source, it carries the thermal energy along.
Radiation is the energy that is emitted by matter in the form of photons or electromagnetic waves. So, it is coming off the fire which makes it radiation.
Conduction is the process by which heat or electricity is directly transmitted through a substance when there is a difference of temperature or of electrical potential between adjoining regions, without movement of the material. Because the picture shows different temperatures, it leds to the conclusion that 9 is conduction.
I hope this helps!!
witch are the two factors decrease as the kinetic energy of the particles in an object decreases
Answer:
mass and speed are the two factor
What is the fundamental different between combustion and nuclear reaction
Answer:
Nuclear reactions involve a change in an atom's nucleus, usually producing a different element. Chemical reactions, on the other hand, involve only a rearrangement of electrons and do not involve changes in the nuclear.
please help me out I’ll give brain to u
Answer:
The answer is streak (A)
Because Streak (the colour of a mineral in its powdered form) is usually obtained by rubbing the mineral on a hard, white surface, such as a tile of unglazed porcelain, so as to yield a line, or streak, of fine powder.
1. Find the molarity of 25g of sodium hydroxide dissolved in 1L of water. Identify the solute and solvent in this solution.
please help me
Answer:
.6250 M
The Sodium Hydroxide is the solute, and the water is the solvent.
Explanation:
mol/volume= Molarity
(25/22.99+16+1.008)/1=.6250 M.
Use the periodic table below to answer the following questions.
What group of elements are contained in the p-block?
a.
1A
c.
3A
b.
2A
d.
3B
Answer:
answer is D
Explanation:
3B
How many grams are present in 3.4
moles of CH2COOH?
Show all work
Answer:
m = 200.6 gr
Explanation:
CH2COOH : n = 3.4 mol
Mr = 12 + 2 + 12 + 2×16 + 1 = 59
n= m / Mr => m = n× Mr => m = 3.4×59 => m = 200.6 gr
What is the molecular geometry, or shape, of the molecule shown in the image?
A. bent
B. tetrahedral
C. trigonal planar
D. linear
Answer:
The correct answer to this is C. Trigonal Planner
Explanation:
I got it right..
R-CH2-COOH in presence of X2 / red P and H2O gives ________
Name the reaction
[tex]\huge{\textbf{\textsf{{\color{pink}{An}}{\red{sw}}{\orange{er}} {\color{yellow}{:}}}}}[/tex ]
Why reaction between aqueous solutions of hydrochloric acid is commonly referred to as neutralization reaction?
Answer:
The chloride ion has no effect on the acidity of the solution since HCl is a strong acid. Chloride is a very weak base and will not accept a proton to a measurable extent. However, the ammonium ion, the conjugate acid of ammonia, reacts with water and increases the hydronium ion concentration:
Explanation:
20. Identi
21. Name the process and explain what is occurring at D.
Answer:
At D: Soil erosion us the process taking place.
Soil erosion is the washing away of the Earth's or soil's top layer by eroding agents.
Which state of matter has the highest energy? *
Answer:
The correct answer is gas.
Explanation:
Gas has the highest energy in the state of matter due to how freely the molecules move. Solid matter is extremely compact, having the particles very close together and not creating a lot of movement. Without having action, there is no energy.
Hope this helps! :)
A student is observing an image of an object that could be a comet, meteoroid or asteroid. Which of the following questions would BEST confirm that the object is a meteoroid?
A.
Was the object once part of an asteroid?
B.
Where is the object located?
C.
Does the object orbit the sun?
D.
Is the object made of rock?
Answer:
A. was the object once part of and asteroid
Explanation:
A is correct because at first asteroid's pieces fall off and burn up to enter the atmosphere and meteoroid's are small while asteroid's are big and rocky
D. Is the object made of rock? The question "Is the object made of rock?" would best confirm that the object is a meteoroid.
What are Meteoroids?Meteoroids are small rocky or metallic objects that are in space and can potentially enter the Earth's atmosphere. By determining if the object is made of rock, it aligns with the characteristics of a meteoroid.
Option A, "Was the object once part of an asteroid?" does not necessarily confirm that the object is a meteoroid since meteoroids can come from various sources, not just asteroids.
Option B, "Where is the object located?" does not provide specific information about the nature of the object and can apply to comets and asteroids as well.
Option C, "Does the object orbit the sun?" is a characteristic shared by comets, asteroids, and meteoroids. It does not specifically confirm that the object is a meteoroid.
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How is dry ice different from ordinary ice?
Answer: Well "ordinary ice" is made from water (as we all know) and dried ice is made from carbon dioxide gas
Explanation:
•Hope this helps•
Does pb(no3)2 + Na3(PO4) = Pb3(PO4)2 + Na(NO3) have a precipitate?
Answer:
Yes, Pb3(PO4)2.
Explanation:
Hello there!
In this case, according to the given balanced chemical reaction, it is possible to use the attached solubility series, it is possible to see that NaNO3 is soluble for the Na^+ and NO3^- ions intercept but insoluble for the Pb^3+ and PO4^2- when intercepting these two. In such a way, we infer that such reaction forms a precipitate of Pb3(PO4)2, lead (II) phosphate.
Regards!
Coal, oil, and natural gas are called _______.
A.
fossil fuels
B.
renewable resources
C.
nuclear power
D.
solar energy
Answer:
I think it's A. I'm pretty sure.
Explanation:
Answer:
Coal, oil and natural gas are called _________A. fossil fuels
Write balanced equations for all the reactions in the catabolism of glucose to two molecules of glyceraldehyde 3-phosphate (the preparatory phase of glycolysis), including the standard free-energy change for each reaction. Then write the overall or net equation for the preparatory phase of glycolysis, with the net standard free-energy change.
Solution :
The balanced chemical equation are
The Catabolism of the glucose takes place in five stages :
1. Glucose + [tex]$ATP$[/tex] → glucose - [tex]$6$[/tex] - phosphate [tex]$+ ADP$[/tex] , [tex]$\Delta G^0=-16.7 \ kJ/mol$[/tex]
2. Glucose - [tex]$6$[/tex] - phosphate → Fructose - [tex]$6$[/tex] - phosphate , [tex]$\Delta G^0=1.7 \ kJ/mol$[/tex]
3. Glucose - [tex]$6$[/tex] - phosphate + [tex]$ATP$[/tex] → [tex]$ADP$[/tex] + Fructose - [tex]$1,6- \text{biophosphate}$[/tex], [tex]$\Delta G^0=-14.2 \ kJ/mol$[/tex]
4. Fructose - [tex]$1,6- \text{biophosphate}$[/tex] → dihydroxyacetonephosphate + glyceraldehyde [tex]$-3 - $[/tex] phosphate, [tex]$\Delta G^0=23.8 \ kJ/mol$[/tex]
5. Dihydroxyacetonephosphate → glyceraldehyde [tex]$-3 - $[/tex] phosphate , [tex]$\Delta G^0=7.5 \ kJ/mol$[/tex]
Therefore, the overall net equations
Glucose + [tex]$2ATP \rightarrow$[/tex] glyceraldehyde [tex]$-3 - $[/tex] phosphate + [tex]$2ADP$[/tex] [tex]$\Delta G^0=2.1 \ kJ/mol$[/tex]
The equation H2 + O2 -> H2O is unbalanced. When balanced, what is the correct coefficient for O2?
Answer:
The balanced equation would be 2H2 + O2 -> 2H2O
Explanation:
The correct balanced equation is 2H₂ + O₂ → 2H₂O, and the correct coefficient for O₂ is 1.
How to balance a chemical equation?Count the atoms on each side first. Next, alter one of the compounds' coefficient. Third, count the atoms once more, and then repeat steps two and three until the equation is balanced.
In the given equation, hydrogens are already balanced. To balance oxygen, multiple water with 2. Thus, equation becomes:
H₂ + O₂ → 2 H₂O
Now, oxygen is balanced, just the hydrogens got unbalanced. To balance hydrogen, multiply the hydrogen by 2 on the left side.
2 H₂ + O₂ → 2H₂O
Now the chemical equation is balanced, in which the number of oxygen and hydrogen are equal on both sides of the arrow.
Therefore, the coefficient of O₂ is 1.
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What type of reaction is this? FeSO4 + Al(OH)3 → Al2(SO4)3 + Fe(OH)2