Answer:
the alteration of limestone by heat and pressure.
Explanation:
Answer:
YES :)
Explanation:
How does marble turn back into Limestone?
»MARBLE is a Metharopic rock formed by the alternation of Limestone by heat and pressure
»The calcite in the limestone changes and fosills and layering in the original limestone disappear as interlocking grains grow.
»If the limestone is pure ,a white marble is formed
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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If you put 5ml of coffee into 15ml of water how much was the coffee diluted
For 5ml of coffee into 15ml of water, the dilution of the coffee is mathematically given as
X=0.25ml
Generally, the equation for the Total volume is mathematically given as
Tv =inital v+final volume
Therefore
Tv=5ml+15ml
Tc=20ml
In conclusion, Ther extent of diluti\on is
X=5/20ml
X=0.25ml
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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
How do I solve this
Answer:
try doing a math problem it may help
Explanation:
A manufacturer advertises that a particular brand of lotion is “pH balanced” and that it has a pH equal to 6.25. What can you infer about the lotion based on the information in the ad?
We can infer about the given information of lotion is that pH is slightly acidic in nature.
What is pH?pH of any solution gives idea about the acidity or basicity of that solution, and it will be calculated as:
pH = -log[H⁺]
pH value in the range of 0 to 6.9 shows acidity, 7 shows the neutral nature and from 7.1 to 14 shows basicity. Given pH value of lotion i.e. 6.25 states that lotion is slightly acidic in nature.
Hence pH value of lotion informs that lotion is slightly acidic.
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Some landforms you might see while traveling across the country could be
mountains
forests
hills
rivers
glaciers
Answer:
Mountains, Hills and Rivers
Explanation:
Because I read it and I already know that
Hope that helps!
Answer:
Mountains, Hills and Rivers
Explanation:
How many grams of potassium iodide (KI) are required to prepare 50 mL of a 0.30 M
solution?
Answer:
137 g
Explanation:
Since1 L=103 mLyou can say that your sample must contain 550.0mL solution⋅1.50 moles KI103mL solution=0.825 moles KITo convert the number of moles of potassium iodide to grams, use the molar mass of the compound.0.825moles KI⋅166.003 g1mole KI=137 g−−−−−
What is the mass in kilograms of a sample containing 2.4 x 10^{24} atoms of this element? Do not use scientific notation.
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.
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:
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 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
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
How many oxygen atom in 0.25 mol ca(No3)2
Answer: I believe its 1 but i'm not sure
Explanation:
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
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 groupSection 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.
What percentage of Americans believes that humans are causing global warming?
10
24
68
93
Answer:
49% say human activitiy contributes global warming.
Answer:
The answer is 68%
Explanation:
including me :)
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 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 family kept the kings of Nepal under guard and would not let them have any power.
Answer:
Gyanendra of Nepal
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
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
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 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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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 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.
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
Which are produced when HCl reacts with Ca(OH)2?
Cl2, H3, and CaO
CaCl and H3O
CaO, Cl2, and H2O
CaCl2 and H2O
Answer:
b did the test
Explanation:
did the test
A balanced chemical equation obeys the law of conservation of mass. The reaction of HCl with Ca(OH)₂ is a weak base - strong acid reaction. The products formed are CaCl₂ and H₂O. The correct option is D.
What is a balanced chemical equation?A chemical equation in which the number of reactants and products on both sides of the equation are equal is defined as the balanced chemical equation. The coefficients are the numbers which are added to balance the chemical equation.
The balanced equation for the reaction of HCl with Ca(OH)₂ is given as:
Ca (OH)₂ (s) + 2HCl (aq) → CaCl₂ (aq) + 2H₂O (l)
Here one mole of Ca (OH)₂ reacts with two moles of HCl and gives one mole of CaCl₂ and two moles of H₂O respectively. Here Ca (OH)₂ is a white precipitate and HCl is a aqueous solution.
Thus the correct option is D.
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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.
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