Answer:
The tectonic style and viability of modern plate tectonics in the early Earth is still debated. Field observations and theoretical arguments both in favor and against the uniformitarian view of plate tectonics back until the Archean continue to accumulate. Here, we present the first numerical modeling results that address for a hotter Earth the viability of subduction, one of the main requirements for plate tectonics. A hotter mantle has mainly two effects: 1) viscosity is lower, and 2) more melt is produced, which in a plate tectonic setting will lead to a thicker oceanic crust and harzburgite layer. Although compositional buoyancy resulting from these thick crust and harzburgite might be a serious limitation for subduction initiation, our modeling results show that eclogitization significantly relaxes this limitation for a developed, ongoing subduction process. Furthermore, the lower viscosity leads to more frequent slab breakoff, and sometimes to crustal separation from the mantle lithosphere. Unlike earlier propositions, not compositional buoyancy considerations, but this lithospheric weakness could be the principle limitation to the viability of plate tectonics in a hotter Earth. These results suggest a new explanation for the absence of ultrahigh-pressure metamorphism (UHPM) and blueschists in most of the Precambrian: early slabs were not too buoyant, but too weak to provide a mechanism for UHPM and exhumation.
Explanation:
1 Clouds are formed when millions of drops of water become suspended in the air. Which
of the following is a step in the process of cloud formation?
A Expansion of cold air
B Formation of carbon dioxide
C Condensation of water vapor
D Breakdown of atmospheric ozone
Answer:
C Condensation of water vapor
Explanation:
One of the components of the atmosphere is water vapour. Water vapour is always present in air.
This water vapour may combine with particles of dust and smoke and condense around them to form clouds.
As more water vapour condenses and coalesces, the clouds become thicker and precipitation eventually follows.
When something heats up, new energy is created, and when something cools down, energy is destroyed. agree disagree
What has the lowest melting point?
a. Sand, SiO2
b. Salt, NaCl
C. Copper Chloride, CaCl2
d. Sugar, C12H22O11
Answer:
Sand has a melting point of 1550
Salt has a melting point of 1474
Copper Chloride has a melting point of 928.4
Sugar has a melting point of 366.8
Based on this information I am sure you can determine sugar has the lowest melting point
What happens if water or food goes down the trachea?
Nothing
the food goes to the stomach
you choke
Answer:
the food goes to your stomache.
Select the correct structure that corresponds to the name. 2, 2, 3-tribromopentane
Answer: A
Explanation:
The structure that corresponds to the name. 2, 2, 3-tribromopentane is the first one. option A is correct.
What is 2, 2, 3-tribromopentane?In 2, 2, 3-tribromopentane structure the organic compound consists of 5 charbon chains which all are attached with a single bond to each other and there are 2 bromines attached at the second number of carbon and the last one is attached at the third number of carbon.
Five carbons in the organic compound which all are bounded with a single bond with each other are named pentane and bromine is a functional group attached to the second and third carbon.
This system of the naming of organic compounds was introduced by the international union of pure and applied chemistry. this organic compound is also named based on this system of IUPAC culture.
Therefore, option A is correct.
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Some sugar is added to cold water in a beaker.
After some time, all the sugar dissolves and spreads throughout the water.
(a)(¡) Name the process that occurs which causes the sugar to spread throughout the water.
(ii) State two ways to make the sugar dissolve more quickly.
(b) Pure water can be obtained from the sugar solution using this apparatus.
Name the process used to obtain pure water from the sugar solution.
i) diffusion, concentration differences in gas and fluid disappears when particles of sugar are evenly spread in solution
ii) Heating the solution, mixing the solution
b) Distillation, solution is heated until water is vaporized and water vapour condenses in another part of apparatus.
Sugar is separated from water by evaporation of the sugar solution to dryness.
i) The process of that causes the sugar to spread throughout the water is called solvation. Solvation simply refers to the interaction of a solute and a solvent.
ii) To make the sugar to dissolve quicker;
The temperature of the solvent can be raisedThe system can be stirred periodicallyb)To obtain pure water from sugar, the sugar is evaporated to dryness. This is done by heating the sugar in a set up as shown in the image attached.
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I’ll give brainliest please help thanks.
Answer:
See Explanation
Explanation:
The equation of the reaction is;
C7H16(g) + 11O2(g) ---->7CO2(g) + 8H2O(g)
1a) Number of moles in 228 g of H2O = 228 g/18 g/mol = 12.67 moles
From the reaction equation;
11 moles of O2 yields 8 moles of H2O
x moles of O2 yields 12.67 moles of H2O
x = 11 * 12.67/8
x = 17.4 moles of O2
Since 1 mole of O2 occupies 22.4 L
17.4 moles of O2 occupies 17.4 moles * 22.4 L/1 mole = 389.76 L
1b) Molar mass of C7H16 = 100 g/mol
Number of moles in 300 g of C7H16 = 300 g/100g/mol = 3 moles
1 mole of C7H16 yields 7 moles of CO2
3 moles of C7H16 yields 3 * 7/1 = 21 moles of CO2
If 1 mole of CO2 occupies 22.4 L
21 moles of CO2 occupies 21 moles * 22.4 L/1 mole = 470.4 L of CO2
2) Number of moles in 202 L of H2 is obtained by;
1 mole of H2 occupies 22.4 L
x moles of H2 occupies 202 L
x = 1 mole * 202 L/22.4 L = 9 moles of H2
From the reaction equation;
3 moles of H2 yields 2 moles of PH3
9 moles of H2 will yield 9 * 2/3 = 6 moles of PH3
Mass of 6 moles of PH3 = 6 moles of PH3 * 34 g/mol = 204 g of PH3
I need to know the right answer ASAP please
Answer:
the correct answer is option C
Which statement describes an electrolyte?
When an electrolyte dissolves in water, the resulting solution conducts an electric current.
can someone answer dis:
1) The atomic number of an element shows how many ___________ there are in its atoms.
thankss
I think that the answer is protons
pls help me ASAP
its very urgent
Answer:
C Region
Explanation:
C Region contains all the liquids as 0 °C is the freezing point of water (Crystals of water are formed leaving it no more in the liquid state) and 100 °C is the boiling point (The water boils leaving it no more in the liquid state).
Hence, All liquids are contained in the C region.
[tex]\rule[225]{225}{2}[/tex]
Hope this helped!
~AH1807how many moles of HCI will react with 18.13g of SrO
Answer:
Explanation:
The balanced chemical equation between
SrO + 2HCl → H2O + SrCl2
What is the molarity of a solution that contains 5.46 moles in 840 mL?
6.5
0 4.90
O 4586
O 0.0065
0 3.9
0 7.46
Answer:
6.50M
Explanation:
Molarity, M, is an unit of concentration widely used in analytical chemistry. Is defined as the ratio between the moles of solute (In this case, 5.46 moles) and liters of solution. To solve this question we must find the volume of the solution in liters in to find the molarity of the solution, as follows:
Liters solution:
840mL * (1L / 1000mL) = 0.840L
Molarity:
5.46moles / 0.840L
6.50MFind the w/w% of a solution that contains 10 grams of solute and 100 grams of solvent
Answer:
I think the w/w% of this question is 10.
The w/w% of a solution that contains 10 grams of solute and 100 grams of solvent is 9.09%
What is mass percentage % ?Mass percentage is another name of w/w % or weight /weight % .
To determine the weight/weight % of a solution :
we divide the mass of solute by mass of the solution (solute and solvent together) and multiply by 100 to obtain per cent.
[tex]\dfrac{w}{w} \; \%\; =\;\rm\dfrac{mass \;of\; solute}{mass\; of \; solute\;+\;mass\;of\;solvent} \times 100[/tex]
It is given that , mass of solute = 10 grams and mass of solvent = 100 grams
So,
[tex]\dfrac{w}{w} \; \%\; =\;\rm\dfrac{10}{10+100} \times 100[/tex]
[tex]\dfrac{w}{w} \; \%\; =\;\rm\dfrac{10}{110} \times 100\\\\\dfrac{w}{w} \; \%\; =\;\rm\dfrac{100}{11}\\\\\dfrac{w}{w} \; \%\; =\; 9.09 \;\%[/tex]
The w/w% of a solution that contains 10 grams of solute and 100 grams of solvent is 9.09% .
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How much heat is required to raise the temperature of 225 grams of ice from -26.8 °C to steam at 133 °C ?
150000 J
General Formulas and Concepts:Chemistry
Thermodynamics
Specific Heat Formula: q = mcΔT
q is heat (in J)m is mass (in g)c is specific heat (in J/g °C)ΔT is change in temperature (in °C or K)Math
Pre-Algebra
Order of Operations: BPEMDAS
BracketsParenthesisExponentsMultiplicationDivisionAdditionSubtractionLeft to RightExplanation:Step 1: Define
Identify variables
[Given] m = 225 g
[Given] c = 4.184 J/g °C
[Given] ΔT = 133 °C - -26.8 °C = 159.8 °C
[Solve] q
Step 2: Solve for q
Substitute in variables [Specific Heat Formula]: q = (225 g)(4.184 J/g °C)(159.8 °C)Multiply: q = (941.4 J/°C)(159.8 °C)Multiply: q = 150436 JStep 3: Check
Follow sig fig rules and round. We are given 3 sig figs.
150436 J ≈ 150000 J
Topic: AP Chemistry
Unit: Thermodynamics
Book: Pearson AP Chemistry
Which physical change is endothermic?
A.
CO2(g) → CO2(ℓ)
B.
CO2(g) → CO2(s)
C.
CO2(ℓ) → CO2(s)
Answer:
The correct answer is A
Explanation:
Endothermic is a reaction of which heat is provided to break down the reacted molecules
Calculate the new temperature when a container of
gas has a pressure of 795 mm Hg at 273 K and the
pressure is lowered to 358 mm Hg.
(Gay Lussac's Law) P1T2/P2T1
- 0.00165
- 246
- 123
- 606
Answer: The new temperature of container is 123 K.
Explanation:
Given: [tex]P_{1}[/tex] = 795 mm Hg, [tex]T_{1}[/tex] = 273 K
[tex]P_{2}[/tex] = 358 mm Hg, [tex]T_{2}[/tex] = ?
Formula used to calculate the new temperature is as follows.
[tex]\frac{P_{1}}{T_{1}} = \frac{P_{2}}{T_{2}}[/tex]
Substitute the values into above formula as follows.
[tex]\frac{P_{1}}{T_{1}} = \frac{P_{2}}{T_{2}}\\\frac{795 mm Hg}{273 K} = \frac{358 mm Hg}{T_{2}}\\T_{2} = 123 K[/tex]
Thus, we can conclude that the new temperature of container is 123 K.
In the Caribbean countries, general election is usually held every _ years
it is held every 4-5 years
what is NaOH element
Sodium hydroxide, also known as lye and caustic soda, is an inorganic compound with the formula NaOH. It is a white solid ionic compound consisting of sodium cations Na + and hydroxide anions OH −
Hydrogen and oxygen combining to form water is an example of a physical change.
Calculate the normal freezing point of a 0.7439 mol aqueous solution of c12h22o11 that has a density of 1.35g/ml. The molal freezing point depression constant of water is 1.86 kg/mole
Answer:
Freezing point of solution = -2.740C
Explanation:
The solution is attached herewith
The normal freezing point of an aqueous solution of C₁₂H₂₂O₁₁ is -1.26°C
The freezing point depression can be calculated using the formula:
ΔTf = i* Kf*m ; where
i = van’t Hoff factorKf = freezing point depression constantm = molalility of solutionThe molality of the aqueous solution of C₁₂H₂₂O₁₁ is first determined using the formula:
molality = moles of solute/mass of water in kgThe mass of water is unknown but is determined from the mass of the solute and solution from the formula:
mass of solvent (water) = mass of solution - mass of solutemass of solute = number of moles * molar mass
moles of solute in 1 L solution = 0.7439 moles
molar mass of solute, C₁₂H₂₂O₁₁ = 342.0 g/mol
mass of solute = 0.7439 moles * 342.0 g
mass of solute = 254.41 g
mass of solution = density * volume
volume of solution = 1 L = 1000 mL
mass of solution = 1.35g/ml * 1000 mL
mass of solution = 1350 g
Therefore, mass of solvent (water) = 1350 g - 254.41 g
mass of solvent (water) = 1095.59 g
mass of solvent (water) in kg = 1095.59 g * 1 kg/ 1000 g
mass of solvent (water) in kg = 1.0956Kg
Thus, molality of solution = 0.7439 moles / 1.0956 Kg
molality of solution = 0.679 mol/kg
The freezing point depression, ΔTf, is then determined using the formula: ΔTf = i* Kf*m
Since C₁₂H₂₂O₁₁ is a non-electrolyte; i for C₁₂H₂₂O₁₁ = 1
Kf of water = 1.86 kg/mole
m = 0.679 mol/kg
ΔTf = 1 * 1.86 * 0.679
ΔTf = 1.26 °C
Therefore, freezing point depression, ΔTf = 1.26 °C
normal freezing point of solution = freezing point of water - freezing point depression
normal freezing point of solution = 0.0°C - 1.26°C
normal freezing point of solution = -1.26°C
Therefore, the normal freezing point of an aqueous solution of C₁₂H₂₂O₁₁ is -1.26°C
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How many moles of N20 gas would have a volume of 3.8 L at 460 mmHg and 77°C?
We are given:
Volume of gas = 3.8 L
Pressure = 460 mmHg
Temperature = 77°c = (77+273)K = 350K
Converting the pressure to atm:
Pressure(in atm) = Pressure(in mmHg) / 760
Pressure = 460/760 = 0.6 atm
Finding the number of moles:
using the ideal gas equation:
PV = nRT [where R is the universal gas constant]
replacing the given values in this equation
(0.6)(3.8) = n(0.082)(350)
n = (0.6*3.8)/(0.082*350)
n = 0.08 moles
in figure 21-4b in what direction is the force defeating the wire
Answer:
the one that has more power to it
1. Calculate the mass percent of salt in salt water if 1 gram of salt is dissolved into 99 grams of water. Show the steps in your calculation.
Question :—
1. Calculate the mass percent of salt in salt water if 1 gram of salt is dissolved into 99 grams of water. Show the steps in your calculation.
Answer :—
Mas of common salt (solute)=1 g
Mas of common salt (solute)=1 Mass of water (soluted) =99 g
Mas of common salt (solute)=1 gMass of water (soluted) =99 gmass of solution =1+99 = 100
gconcentration of solution= mass of solution (M mass of solute) ×100 [tex] = > \frac{1}{100} \times 100[/tex]
=> 1% [/tex]Hence, the concentration of the solution is 1%
The mass percent of salt in salt water if 1 gram of salt is dissolved into 99 grams of water is 1%.
What is mass percent?The way of expressing a concentration is mass percent. Moreover, it describes the component in a particular mixture. The solution composition can be understood in a mass percentage. It shows the mass of solute present in a given mass of solution. The quantity of solute is expressed in mass or by moles.
The mass percent may be a way of expressing a degree. Moreover, it describes the component during a particular mixture. The solution composition is often described in mass percentage. It shows the mass of solute present during a given mass of solution. The number of solutes is expressed in mass or by moles.
Percentage of mass = (solute’s mass ÷ mass of solution) x 100%, substitution of values gives 1/100×100=1%.
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A lynx is a cat with a thick coat that lives in cold climates. Its paws are wide and large, which makes them useful for walking over snow. Lynx generally hunt hares, deer, and fish. In what biome would you MOST expect to find a lynx?
What is the molecular formula?
A) C₂H₂O
B) CO2
C) HCI
D) NaOH
Answer:
B) Co2 cuz in the diagram I see two similar atoms it might be of (oxygen) and the one atom of (carbon)
How many liters of a 6.0 M solution of acetic acid contain 0.0030 moles
Answer: Least Common Multiplier of a6m, 0.003 moles 0.01elamos
Steps 6m, 0.003 moles
Compute an expression comprised of Factors that appear either in a6m or 0.003 moles
= 0.018elamos
Explanation:
Taking into account the definition of molarity, 0.005 liters of a 6.0 M solution of acetic acid contain 0.0030 moles.
Definition of molarityMolar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.
The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:
[tex]molarity=\frac{number of moles}{volume} [/tex]
Molarity is expressed in units [tex]\frac{moles}{liters} [/tex].
This caseIn this case, you have a 6.0 M solution of acetic acid that contain 0.0030 moles. Replacing in the definition of molarity:
[tex]0.6\frac{moles}{liters} =\frac{0.0030 moles}{volume} [/tex]
Solving:
0.6 [tex]\frac{moles}{liters} [/tex]× volume= 0.0030 moles
volume= 0.0030 moles ÷0.6 [tex]\frac{moles}{liters} [/tex]
volume=0.005 liters
Finally, 0.005 liters of a 6.0 M solution of acetic acid contain 0.0030 moles.
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Which of these hydrocarbons is a ketone? Check all that apply.
Answer:
The answer is below
Explanation:
Ketone is a class of organic compounds which has a carbonyl group such that the carbon atom is covalently bonded to an oxygen atom, while the remaining two bonds are to other carbon atoms or hydrocarbon radicals.
Ketones are highly reactive hydrocarbons, they can be gotten from the oxidization of secondary alcohols. Ketone are used for medicinal applications.
The third option is the ketone
it’s the the last 2 choices
2. Which has the higher boiling point: Explain each choice. (Reminder-the more ions -
the more roadblocks for the solvent)
C. .100 m KCL or .100 m MgCl2
Answer:
100 m of KCL
Explanation:
This is because it is a more reactive metal and higher in the electro reactivity series which lead us to believe that it will take a longer time to heat along with the fact that it is lower in the periodic table and is a metal
What molar concentration (molarity) results when 1.28 L of 14.38 M HCl is diluted to 9.45 L of water?
Answer:
1.95 M
Explanation:
Molarity is a measure of the molar concentration of a substance (solution). In relation to the volume, it is calculated using the formula as follows;
C1V1 = C2V2
Where;
C1 = initial concentration (M)
C2 = final concentration (M)
V1 = initial volume (L)
V2 = final volume (L)
According to the provided information in this question;
C1 = 14.38 M
C2 = ?
V1 = 1.28 L
V2 = 9.45 L
Using C1V1 = C2V2
14.38 × 1.28 = C2 × 9.45
18.4064 = 9.45 C2
C2 = 18.4064 ÷ 9.45
C2= 1.95 M
