Answer:
She turned back at the point at which she forgot she left her briefcase. If this isn't the correct answer, please be more specific in the question.
Explanation:
3.Calculate the pH of a 0.250 M solution of potassium phenolate, KC6H5O. Ka for phenol (C6H5OH) is 1.0 x 10-10.
From the statement and the information available in the question, the pH of the solution is 12.2.
What is Ka?The term Ka refers to the acid dissociation constant of a substance, we can obtain this by setting up the ICE table as shown;
C6H5O^- + H2O ⇄ C6H5OH + OH^-
I 0.250 0 0
C -X +X +X
E 0.250 -x x x
Now;
Kb = 1 * 10^-14/ 1.0 x 10-10
Kb = 1 * 10^-4
Kb = [C6H5OH] [OH^-]/[C6H5O^-]
1 * 10^-4 = x^2/ 0.250 -x
1 * 10^-4 (0.250 -x) = x^2
2.5 * 10^-4 - 1 * 10^-4 x = x^2
x^2 + 1 * 10^-4 x - 2.5 * 10^-4 = 0
x=0.016 M
Given that; [C6H5OH] = [OH^-] =x
pOH = -log(0.016 M) = 1.8
pH = 14 - 1.8 = 12.2
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Insoluble sulfide compounds are generally black in color. Which of the following combinations could yield a black precipitate? a) Na2S(aq) + KCl(aq) b) Li2S(aq) + Pb(N03)2(aq) c) Pb(C103)2(aq) + NaNO3(aq) d) AgNo3(aq) + KCl(aq) e) K2S(aq) + Sn(N03)4(aq)
Answer:
b) Li2S(aq)+Pb(NO3)2(aq)
e) K2S(aq)+Sn(NO3)4(aq)
Explanation:
they are the only two of the options that contain a sulfide ion (S) therefore they are the only ones that could be considered in the question.
b) Li2S(aq)+Pb(NO3)2(aq)
e) K2S(aq)+Sn(NO3)4(aq)
HELP ME OUT PLS!!!!!!!
Our earth is situated in the Milky Way galaxy. The Milky Way galaxy is which type of galaxy?
elliptical
irregular
spiral
oval
Answer:
the spiral type of galaxy
Our earth is situated in the Milky Way galaxy. The Milky Way galaxy is a spiral galaxy. Therefore, the correct option is option C.
What is milky way galaxy?The Milky Way constellation is indeed a huge spiral formation containing hundreds of trillions of stars, along with the Sun. the irregularly formed belt of stars and gas clouds visible from Earth that spans the sky. despite the reality that Earth is positioned within the Milky Way constellation, astronomers do not completely understand its nature, despite its proximity with other external star systems.
A dense layer of interstellar dust obscures the majority of the Galaxy from optical observatories, and astronomers can only understand its massive building with the assistance of radio and infrared telescopes, which can detect the forms of light that may travel through the obscuring material. Our earth is situated in the Milky Way galaxy. The Milky Way galaxy is a spiral galaxy.
Therefore, the correct option is option C.
To know more about milky way galaxy, here:
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What is the pH of a 0.050 M LiOH solution?
Answer:
a. <1.0
b. 1.30
c. 3.00
d. 11.00
e. 12.70
what is joule ?
a. time
b. mass
c. volume
d. length
e. none
Explanation:
It is the unit of work or energy
An element has 25 protons and 30 neutrons. What is the correct nuclear notation for the element? Please use the Periodic Table to find the correct symbol
Answer:
It is:
55
Mn
25
How do you think life on Earth would be different without the evolution of angiosperms? Provide two examples, each with an explanation.
PLSSS HURRRYYY!!!!!! WILL GIVE BRAINLIEST!!!
Answer:
Without angiosperms, average annual rainfall in the area declined by 300 millimeters. In the eastern Amazon basin, the length of the wet season decreased by nearly 3 months. The extent of the wettest rainforests, which receive more than 100 millimeters of rain per month, shrank by 80%.
Which pictures shows the proper structure of the water molecule? Click the picture to see each choice.
The third picture is the answer
Explanation:
there are 2 hydrogen atom 1 oxygen
Choose all the answers that apply.
The troposphere is _____.
the warmest layer
responsible for weather and clouds
the coldest layer
warmed by the Earth's surface
the lowest layer
Answer:
The lowest layerWarmed by earth surfaceExplanation:
Troposphere is the lowest layer located on atmosphere of earthIt contains all green house gases so it becomes warmed by reflection of heat from earth surfaceAnswer:
warmed by the Earth's surface
the lowest layer
Explanation:
What pressure is exerted by 901.3 g of CH4 in a 0.690 L steel container at 185.7 K
Ideal gas law: PV = nRT
Write down what you know and what you want to fine:
P = pressure = ?
V = volume in liters = 0.950 L
n = moles = 727.2 g x 1 mol CH4 / 16 g = 45.45 moles
R = gas constant = 0.0821 Latm/Kmol
T = temperature in K = 221.9K
Solve for P:
P = nRT/V = (45.45)(0.0821)(221.9) / 0.950
P = 872 atm (3 sig. figs. based on 0.950 L having 3 s.f.)
19. Which reaction will form a salt and water?
Aa precipitation reaction
Ba displacement reaction
Can acid-base neutralization
Dan ionic dissociation reaction
Answer:
acid-base neutralization
Explanation: When a base and acid react, it neutralizes the substance making it a neutral substance, which is water and a salt
How do I solve this
Answer:
try doing a math problem it may help
Explanation:
betrokke, onthou qrxn = AH en onthou dat "per mol" beteken om te deel.) • In an acid-
base neutralization reaction between 50.0 mL of 0.5 M nitric acid (HNO3) and 50.0
mL of 0.5 M potassium hydroxide (KOH), Arxn was found to be -2500 J. The enthalpy
change (J) per mole of base is therefore ... (Hint: determine the relevant number of
moles of base, remember Arxn = AH and remember that "per mole" means divide.)
The enthalpy tell us about the heat that may be absorbed or evolved in a reaction. The ethalpy of this reaction is -100 kJ/mol.
What is enthalpy?The term enthalpy deals with the heat that is absorbed or emitted in a reaction. The reaction equation is; HNO3 + KOH ----> KNO3 + H2O
Number of moles of HNO3 = 0.5 M * 50/1000 L = 0.025 moles
Number of moles of KOH= 0.5 M * 50/1000 L = 0.025 moles
Since the reaction is 1:1, then heat evolved = - (2500 J * 10^-3)/0.025 moles
= -100 kJ/mol
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Which of the following mixtures cannot be separated by using both particle size and color as observable properties?
(A) Nickels and pennies
(B)Sand and rocks
(C) Stick and stones
(D)Salt and beans
Answer:
(A) Nickels and pennies
Define, giving examples of
Binary ionic Compound:
Answer:
A binary ionic compound contains an ion that is a metal (cation) and an ion that is a nonmetal (anion).
Explanation:
Tell me if its wrong
This question is in my General Chem 2 class. I will give Brainlist!
Given: 8As + 12H20 —>3H2AsO4- + 3H+ + 5AsH3 What mass of arsenic is required to produce 15.0 mL of 0.0852M H2AsO4-?
A. 0.0359 g
B. 0.255 g
C. 17.0 g
D.1134 g
Answer:
B
Explanation:
From the given chemical equation, we want to determine the mass of arsenic necessary to produce 15.0 mL of 0.0852 M H₂AsO₄⁻.
Find the amount of moles present in 15.0 mL of 0.0852 M H₂AsO₄⁻ solution. Recall that M = mol/L:
[tex]\displaystyle 15.0\text{ mL} \cdot \frac{0.0852\text{ mol H$_2$AsO$_4^-$}}{1\text{ L}} \cdot \frac{1\text{ L}}{1000\text{ mL}} = 0.00128\text{ mol H$_2$AsO$_4^-$}[/tex]
With stoichiometric ratios and molecular weights, determine the mass of arsenic necessary:
[tex]\displaystyle 0.00128 \text{ mol H$_2$AsO$_4^-$} \cdot \frac{8\text{ mol As}}{3\text{ mol H$_2$AsO$_4^-$}}\cdot \frac{74.92\text{ g As}}{1\text{ mol As}} = 0.256\text{ g As}[/tex]
In conclusion, the answer is B.
If you have 2m of hydrochloric acid and also 2m of vinegar which one is weak and strong and why?
Section 1
1. The Florida scrub jay is a bird found only in the scrub habitat of Central Florida. Efforts are being ma
in Florida to preserve the scrub habitat by limiting development by humans and maintaining natural
conditions. Which may occur over time if the Florida scrub habitat is NOT preserved? (SC.5. L.15.1)
A. The scrub jays may become extinct.
B. The scrub jays may move to live in a coastal habitat.
C. The scrub jays may learn to live in any habitat that replaces the scrub habitat. X
D. The scrub jays may have offspring with changed features to match a new habitat.
Answer:
i belive it is A
Explanation:
well if it olny lives in those scrub habitats and the habitats get desroyed or polluted they will no longer be habitable there fore causeing the scrub jay to go exctinct.
PLEASE HELP 50 POINTS NO ROBOTS OR I WILL REPORT Which functional group does the molecule below contain?
H
H-C-C
H
H
O A. Ether
O B. Amino
O C. Hydroxyl
• D. Carbonyl
Answer:
D. carbonyl
Explanation:
A C=O group is present, otherwise known as a carbonyl groupWhat is the pH of a 0.0170 M solution of HI?
Answer:
To solve the problem, enter the concentration of the hydrogen ion. The pH of a 0.025 M solution of Hydrobromic Acid is 1.602.
b. A silver ring contains 1.1 × 1022 silver atoms. How many moles of silver are in the ring?
Answer:
1124.2
Explanation:
just easy mathamatics
How many Calories are contained in one tablespoon of palm oil, which has 45.3 g of fat? [Hint: One
gram of protein or one gram of carbohydrate typically releases about 4 Calg, while fat releases 9
Cal/g.] Report your answer to 1 significant figure.
Answer:
120 calories
Explanation:
Calories and nutrition for world population. One tablespoon of palm oil has 120 calories and 13.6 grams of fat. What does it tell you? Of the 13.6 grams of fat in a tablespoon of palm oil, 6.7 grams are saturated and 6.3 grams are unsaturated.
How many oxygen atom in 0.25 mol ca(No3)2
Answer: I believe its 1 but i'm not sure
Explanation:
1. Nene geese in Hawaii are endangered because of
O pollution exotic species
O poaching
O habitat destruction
Answer:
✔ habitat destruction
Explanation:
the 3 reasons are:
hunting
habitat loss
introduced predators
summed up its habitat destruction
What family kept the kings of Nepal under guard and would not let them have any power.
Answer:
Gyanendra of Nepal
How many grams of a gas with a molar mass 36.02 g/mol would be required to occupy a 3979 mL flask at 1.07 atm and 81.7 degrees Celcius? Record your answer in scientific notation to 2 decimal spaces.
A 3979 mL flask is occupied by 5.26 g of a gas with a molar mass of 36.02 g/mol at 1.07 atm and 81.7 °C.
What is an ideal gas?An ideal gas is that whose behavior can be explained using the ideal gas laws.
Step 1. Convert 81.7 °C to Kelvin.We will use the following expression.
K = °C + 273.15 = 81.7 + 273.15 = 354.9 K
Step 2. Calculate the moles of the gas.We will use the ideal gas equation.
P × V = n × R × T
n = P × V / R × T
n = 1.07 atm × 3.979 L / (0.08206 atm.L/mol.K) × 354.9 K = 0.146 mol
Step 3. Calculate the mass of the gas.The molar mass of the gas is 36.02 g/mol.
0.146 mol × 36.02 g/mol = 5.26 g
A 3979 mL flask is occupied by 5.26 g of a gas with a molar mass of 36.02 g/mol at 1.07 atm and 81.7 °C.
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Which of the following is not an example of an inexhaustible resource?
1.) Wind power
2.) Wave and tidal power
3.) Solar energy
4.) Biomass
Answer:
I would say 4.) Biomass
Explanation:
This looks like the best possible answer because it is plant based. Worst case scenario we could run out of plants. In comparison, wind will pretty much always be around along with wave/tidal power and solar.
what is the oxidation number of sulphur Cr2SO4
should be Chromium(III) sulfate: Cr₂(SO₄)₃
the oxidation number:
Cr₂(SO₄)₃ = 0
Cr = +3
SO₄ = -2
S + 4.O = -2
S + 4.-2 = -2
S = +6
Which subshells (s, p, d, f, or g) can have electrons with the indicated magnetic quantum number (ml)?
Answer:
=3 means is 3 or greater so that would be f and g subshells
=0 means is 0 or greater so that would be s, p, d, f and g subshells
=1 means is 1 or greater so that would be p, d, f, and g subshells
=4 means is 4 or greater so that would be g only
How many moles of CO2 will be produced in the following reaction if the initial amount of reactants was 0.50 moles?
2NaHCO3 —> Na2CO3 + CO2 + H2O
Answer:
In the following reaction, how many moles of
CO2
can be made by reacting 0.50 moles of
CH4
with excess oxygen?
CH4+O2>CO2+H2O
Explanation: