c) A student titrated 50.0mL of a 0.10M solution of a certain weak acid with NaOH(aq) . The results are given in the graph above. (i) What is the approximate pKa of the acid?
Answer:
3.2
Explanation:
The missing graph is attached in the image below:
Initially, p.H from the graph is approximately 2.1
Therefore; the hydrogen ion concentration is
[tex][H^+] = 10^{-2.1}[/tex]
[tex][H^+] = ({k_a \times 0.10})^{\dfrac{1}{2}}[/tex]
[tex]{k_a} = 6.3 \times 10^{ -4}[/tex]
pKa = [tex]-log ( 6.3 \times 10^{-4})[/tex]
pKa = 3.2
If you picked up a hot coffee mug with lots of thermal energy using your hand, where will the thermal energy transfer to?
Answer:
It will go to your hand.
Explanation: If you touch a hot cup/mug you'll most likely burn yourself, so it would probably go to your hand.
How many moles are in 3.86 x 1023 molecules of Carbon Dioxide (CO2)?
Answer:
0.64 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} [/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{3.86 \times {10}^{23} }{6.02 \times {10}^{23} } = \frac{3.86}{6.02} \\ = 0.641196...[/tex]
We have the final answer as
0.64 molesHope this helps you
Identify the following for an atom with 8 protons, 8 electrons, and 7 neutrons.
a. Atomic number:
b. Mass number:
c. Nuclear Notation:
d. Hyphen Notation:
please help
Answer:
i thinks its a. but iam not sure
which of the following are the correct formulas for potassium oxide and calcium oxide respectively
Explanation:
potassium oxide is K2O
calcium oxide is CaO
calcium oxide is used to make glass
potassium oxide is used in fertilizer
A roller coaster is travelling without friction as
shown in the diagram. If the speed of the roller
coaster at A is 3.0 m/s, what is the speed at B?
Answer:
Thus, the speed at B = 13 m/s
Explanation:
From the attached image:
Using the conservation of energy;
Iinital M.E = Final M.E
where;
M.E = mechanical energy
∴
[tex]\dfrac{1}{2} \times m \times v_A^2+ mgh_A = \dfrac{1}{2} \times m \times v_B^2+ mgh_B[/tex]
[tex]\dfrac{1}{2} \times m \times 3^2+m \times 9.8 \times 15 = \dfrac{1}{2} \times m \times v_B^2+ m\times 9.8 \times 7 \\ \\ \dfrac{1}{2} \times 3^2 + 9.8 \times 15 = \dfrac{1}{2} \times v^2 + 9.8 \times 7 \\ \\ \implies 151.5 = 0.5 v^2 + 68.6 \\ \\ 0.5v^2 = 151.5 - 68.6 \\ \\ 0.5 v^2 = 82.9 \\ \\ v^2 = \dfrac{82.9}{0.5} \\ \\ v^2 = 165.8 \\ \\ v = \sqrt{165.8} \\ \\ v = 12.9 \ m/s\\ \\ \mathbf{v \simeq 13 \ m/s}[/tex]
What is the pH of a 0.00530 M solution of HCI?
Answer:
2.28
Explanation:
HCl(l) ===> H+ + cl-
HCl is a very strong acid. Almost all of it will decompose to the right. That means the concentration of H+ is 0.00530
pH = - log [H+]
pH = - log[0.00530]
pH = - - 2.2757
pH = 2.2757
Rounded this 2.28
Which cross section below best shows the locations of high air pressure and low air pressure near a beach on a hot, sunny, summer afternoon?
Locations of high air pressure is the beach whereas the location of low air pressure is in the sea on a hot, sunny, summer afternoon.
Where is low and high air pressure exists?Areas where the air is warmed have lower pressure because the warm air rises in the air. These areas are known as low pressure systems. Places where the air pressure is high, are called high pressure systems. These are places where air is cold.
So we can conclude that Locations of high air pressure is the beach whereas the location of low air pressure is in the sea on a hot, sunny, summer afternoon.
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I GIVE 40 POINTS PLZ ANSWER
Order the following aqueous solutions from lowest freezing point to highest freezing point: 1 M NaNO3, 1 M Li3PO4, 1 M Ca(NO3)2, 1 M C6H12O6s
Answer:
1 M C6H1206s
1 M NaNO3
1 M Ca(NO3)2
1 M Li3PO4
Explanation:
Hope it helps!
The order of solutions from lowest freezing point to highest freezing point of the given compounds are Li₃PO₄ < Ca(NO₃)₂ < NaNO₃ < C₆H₁₂O₆.
How we calculate the depression in freezing point?Depression in freezing point will be calculated from the following reaction as:
ΔTf = i × Kf × m, where
ΔTf = change in freezing point
i = Vant Hoff factor
Kf = freezing constant
m = concentration in terms of molality
In the question concentration of compounds are given in molarity and for all compounds it is same, so the depression in freezing point will directly depends on the Vant Hoff factors of given compounds.
Vant Hoff factor for NaNO₃ is 2.Vant Hoff factor for Li₃PO₄ is 4.Vant Hoff factor for Ca(NO₃)₂ is 3.Vant Hoff factor for C₆H₁₂O₆(s) is 1.From the above data it is clear that Li₃PO₄ will have the lowest freezing point and C₆H₁₂O₆ will have the highest and sequence from lowest to highest will be shown as:
Li₃PO₄ < Ca(NO₃)₂ < NaNO₃ < C₆H₁₂O₆.
Hence the required order is Li₃PO₄ < Ca(NO₃)₂ < NaNO₃ < C₆H₁₂O₆.
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How many grams are in 3.4 moles of C2H5OH molecules? (use molar mass and round answer to the correct number of sig figs)
Composition of the air breathed in and the air breathed out changes
Answer:
breathed in air contains oxygen while breathed out air contains higher percentage of CO2
The question is on the picture
Nitrogen reacts with Hydrogen to form Ammonia gas by Haber's Process.
N₂ + 3H₂ → 2NH₃
What is Law of conservation of Mass?This law states that Mass can neither be created, nor destroyed and it can just be transformed from one form to another. This law has application as balancing of the reaction.
Balancing of a reaction is done according to the "Law of conservation of mass" and balancing helps in solving stoichiometry questions correctly as if we will not balance the reaction then the quantitative results in a particular question doesn't come correctly.
Balancing of a reaction helps in mole concept as well and it is one of the laws of chemical reactions as well.
Some examples of balanced chemical reaction are-
2Mg(s) + O₂(g) ⟶ 2MgO(g)
According to the given picture,
Correct option is C. It consists 1 molecule of Nitrogen gas, 3 moles of Hydrogen gas and 2 moles of Ammonia gas.
Therefore, Nitrogen reacts with Hydrogen to form Ammonia gas by Haber's Process.
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How many moles of carbon dioxide gas occupy a volume of
81.3 L at 204 kPa and a temperature of 95.0 °C?
mol CO2
Answer:
5.42
Explanation:
I used a calculator
Answer: 5.42 mol CO2
Explanation: Uses idea gas law
How many moles are in 30.68 grams of potassium nitrate? Molar mass of potassium nitrate is 101.11 g/mol.
A. 1.36 moles
B. 1.02 x 10^-22 moles
C. 3,102.05 moles
D. 0.303 moles
What is the chemical formula for Manganese (IV) biphosphate?
Group of answer choices
Mn(HPO4)2
Mn2(HPO4)4
Mn4(HPO4)2
Mg2(HPO4)4
No correct response
Which of these are found in eukaryotic cells?
1. nucleoid
2. vacuole
3. mitochondria
4. Golgi apparatus
O A. 1, 3, 4
O B. 1, 2,4
O C. 2, 3, 4
O D. 1, 2, 3
Answer:
C
Explanation:
nucleoid is prokaryotic
Answer:
mitochondria is found in eukaryotic cells.
what is the xonclusion of separating acetone and water by simple and fractional distillation
Answer:
In conclusion, acetone was determined to be the unknown used in the simple distillation and acetone- water was separated successfully by fractional distillation. Introduction Distillation is the chief technique used to separate and purify liquids.
Directions: Read each sentence carefully. Write the letter of the
correct answer on the answer sheet provided.
1. What is produced when two surfaces rub against each other?
A. air
B. pressure
C. motion
D. friction
2. Which surface increases friction?
A. polished B. rough
C. lubricated
D. shiny
3. What causes falling objects to fall?
A. speed
B. gravity
C. acceleration
D. wind
4. Which surface decreases friction?
A. smooth B. rugged
C. rough
D. rocky
5. Why do you move faster when running down a hill?
A. Gravity pulls you up.
C. Gravity pulls you down.
B. Wind pushes you back.
D. Wind pulls you.
Answer:
1 - D) friction
2- B) rough
3- B) gravity
4- A)smooth
5- C)gravity pulls you down
What volume in milliliters of 0.100 M HCIO3 is required to neutralize
40.0 mL of 0.165 M KOH?
Answer:
66.0 mL HClO3
Explanation:
M1V1 = M2V2
M1 = 0.100 M HClO3
V1 = ?
M2 = 0.165 M KOH
V2 = 40.0 mL KOH
Solve for V1 --> V1 = M2V2/M1
V1 = (0.165 M)(40.0 mL) / (0.100 M) = 66.0 mL HClO3
Determine the mass in grams of 4.69 x 1021 atoms of barium. (The
mass of one mole of barium is 137.33 g.)
Answer:
1.07 g Ba
Explanation:
Hello there!
In this case, according to the definition of the Avogadro's number and the molar mass, it is possible to say that 6.022x10^{23} atoms of barium equal one mole, and at the same time, 1 mole equals 137.327 grams of this element; thus, it is possible to say that 6.022x10^{23} atoms of barium have a mass of 137.327 grams; therefore, it i possible for us to calculate the required mass in grams as shown below:
[tex]4.69x10^{21}atoms*\frac{137.327gBa}{6.022x10^{23} atoms} \\\\=1.07gBa[/tex]
Best regards!
From the choices provided below, list the reagent(s) in order that will react with 3-pentanone to form 3-pentanol.
a. H2/Pt
b. H2SO4, Δ
c. OsO4, H2O
d. CH2MgBr
e. H3O+
f. PhMgBr
g. H3O+
h. H3O+
i. RCO3H
j. KOH
Answer:
NaBH4
H3O+
Explanation:
The conversion of 3-pentanone to form 3-pentanol is a reduction reaction. The first step of the reaction is the transfer of a hydride ion to the carbonyl from the reducing agent sodium borohydride.
After the transfer of the hydride ion, transfer of a proton from H3O+ completes the reaction mechanism hence 3-pentanol is formed from 3-pentanone.
A student mixes 50.0 mL of 1.00 M Ba(OH)2 with 72.8 mL of 0.375 M H2SO4.
a)Calculate the mass of BaSO4 formed.
b)Calculate the pH of the mixed solution.
Answer:
The correct answer should be 12.72 pH of the mixed solution and 9.94g mass of solid BASO4 formed.
The molecules of Ba(OH)2 are : 1.00M x 0.05L = 0.05 ( moles )
The molecules of H2SO4 are : 0.494M x 0.0864L = 0.0426816
Ba(OH)2 + H2SO4 ----> BaSO4 + 2 H2O
0.0426816<--- 0.0426816
The mixed solution is Ba(OH)2 with 0.05 - 0.0426816 = 0.0073184
The concentration of mixed solution is : 0.0073184 : ( 0.05 + 0.0864 ) = 0.054 M
The pH of mixed solution is 14 - -log[0.054] = 14 - 1.27 = 12.73 PH
And the mass of BaSO4 is 0.0426816 x ( 137 + 32 + 16 x 4 ) = 9.94 gams.
What is the net ionic equation for the reaction between Na2SO4 and CaCl2?
A. 2Na+(aq) + 2Cl-(aq) 2NaCl(aq)
B. Na2SO4(aq) + CaCl2(aq) CaSO4(s) + 2NaCl(aq)
C. SO42-(aq) + Ca2+(aq) CaSO4(s)
D. 2Na+(aq) + SO42-(aq) + Ca2+(aq) + 2Cl-(aq) CaSO4(s) + 2Na+ + 2Cl-(aq)
The net ionic equation for the reaction between Na₂SO₄ and CaCl₂ is:
SO₄²¯(aq) + Ca²⁺(aq) —> CaSO₄(s)
(Option C)
Dissociation equationIn solution, Na₂SO₄ and CaCl₂ will dissociate as follow
Na₂SO₄(aq) —> 2Na⁺(aq) + SO₄²¯(aq)
CaCl₂(aq) —> Ca²⁺(aq) + 2Cl¯(aq)
How to write the net ionic equationNa₂SO₄(aq) + CaCl₂(aq) —>
2Na⁺(aq) + SO₄²¯(aq) + Ca²⁺(aq) + 2Cl¯(aq) —> CaSO₄(s) + 2Na⁺(aq) + 2Cl¯(aq)
Cancel out the spectator ions (i.e Na⁺ + Cl¯) to obtain the net ionic equation
SO₄²¯(aq) + Ca²⁺(aq) —> CaSO₄(s)
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When is energy released during a chemical reaction?
A. when chemical bonds break and form
B. when chemical bonds form
C. when chemical bonds break
“Don’t click links if answers have one!”
look at the picture and select the answer quicly
Hydrogen, deuterium, and singly ionized helium are all examples of one-electronatoms. The deuterium nucleus has the same charge as the hydrogen nucleus, and almost exactlytwice the mass. The helium nucleus has twice the charge of the hydrogen nucleus, and almostexactly four times the mass. Make a prediction of the ratios of the ground state energies of theseatoms, considering that current spectroscopy accuracy is extremely good (on the order of107).
Answer:
0.99986
Explanation:
attached below is the detailed solution to the given problem
Express the ratios of the ground state energies of these atoms
ground state energies ( Ed , Ehe )
= Ed / Ehe = -13.5963 / -13.59815
= 0.99986
can boron bond with lithium
Answer:
No, they are not able to bond.
Explanation:
Hello there!
In this case, regarding chemical bonds, it is necessary to remember that these come up when a metal is bonded with a nonmetal, or, when two nonmetals get bonded; however, even there exist a type of denominated metallic, it is not eligible for boron and lithium because they tend to stable as cations (positive) and therefore, equal charges are not eligible for bonding, thus, boron and lithium would not be able to bond.
Best regards!
What is standard pressure in atmospheres?
a.10
b.1
c.5
d.2
A chromophore is:______
a. an unsaturated organic functional group that absorbs ultraviolet or visible radiation.
b. a biochemical species, such as NADH, that strongly absorbs ultraviolet or visible radiation.
c. an ion or complex of elements from the first two transition series that absorbs visible radiation.
d. a molecule that contains an electron-donor group bonded to an electron-acceptor. When radiation is absorbed, an electron is transferred from the donor to an orbital of the acceptor.
a. an unsaturated organic functional group that absorbs ultraviolet or visible radiation.
Hope this helps :D
A scuba tank has a volume of 10.3 L and a pressure of 19,300 kPa. If the gas is transferred to a 50.0 L container, what is it's new pressure?
Hi there!
Here's a screenshot of the problem being solved.
