The spontaneity of a reaction depends on the temperature, enthalpy and entropy.
What is spontaneity of a reaction?A reaction is said to be spontaneous if it can proceed on its own without a further input of energy.
In the first case, when the enthalpy is less than zero and the entropy is greater than zero, the reaction is spontaneous at all temperatures.
In the second case, when the enthalpy greater than zero and the entropy is greater than zero, the reaction needs to proceed at high temperatures to be spontaneous.
In the third case, when the enthalpy is greater than zero and the entropy is less than zero, the reaction ought to proceed at low temperature in order to be spontaneous.
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Answer:
1.Spontaneous at all temperatures
2. Spontaneous only at high temperatures
3. Non spontaneous at all temperatures
4. Spontaneous only at low temperatures
Explanation:
Just did it on edge
What are properties of a base
Answer:
base taste bitterbase feel so spy slippery to touchbase turn wet red litmus paper blueWhat is the coefficient for lead (II) carbonate
Q4: People have concerns about the use of slash and burn partly because it affects the carbon cycle in multiple ways. What are two of those ways
From what we know, we can confirm that people have concerns about the use of slash and burn because it creates more CO2 and decreases the natural ability to remove it from the air.
Why is slash and burn so environmentally harmful?This has to do with CO2 emissions. The slash and burn technique involves slashing away and burning large areas of green land in order to create farmland. This creates large amounts of CO2 through combustion that are released into the atmosphere. This also removes plants that act as a natural filter for CO2 in the atmosphere, limiting the possibility of a natural recovery.
Therefore, we can confirm that People have concerns about the use of slash and burn because it creates more CO2 and decreases the natural ability to remove it from the air.
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2Ca (PO.)2 + 6SiO2 + 10C - 6Casio, + PA+10CO
Starting with 700.0 grams of calcium phosphate and assuming excess silicon dioxide and carbon,
how many moles of phosphorus will be produced?
Taking into account the reaction stoichiometry, 0.1129 moles of P₄ is required to react with with 700.0 grams of calcium phosphate.
Reaction stoichiometryIn first place, the balanced reaction is:
2 Ca₃(PO₄)₂ + 6 SiO₂ + 10 C → 6 CaSiO₃ + 10 CO + P₄
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
Ca₃(PO₄)₂: 2 moles SiO₂: 6 moles C: 10 moles CaSiO₃: 6 moles CO: 10 molesP₄: 1 moleThe molar mass of the compounds is:
Ca₃(PO₄)₂: 310 g/moleSiO₂: 60 g/mole C: 12 g/moleCaSiO₃: 116 g/moleCO: 28 g/moleP₄: 124 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
Ca₃(PO₄)₂: 2 moles ×310 g/mole= 620 gramsSiO₂: 6 moles ×60 g/mole= 360 grams C: 10 moles ×12 g/mole= 120 gramsCaSiO₃: 6 moles ×116 g/mole= 696 gramsCO: 10 moles ×28 g/mole= 280 gramsP₄: 1 mole ×124 g/mole= 124 gramsMoles of phosphorus P₄ producedThe following rule of three can be applied: If by reaction stoichiometry 620 grams of Ca₃(PO₄)₂ produces 1 mole of P₄, 70 grams of Ca₃(PO₄)₂ produces how many moles of P₄?
[tex]moles of P_{4} =\frac{70 grams of Ca_{3}(PO_{4} )_{2}x1 mole of P_{4} }{620 grams of Ca_{3}(PO_{4} )_{2}}[/tex]
moles of P₄= 0.1129 moles
Finally, 0.1129 moles of P₄ is required to react with with 700.0 grams of calcium phosphate.
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1. A 0.338-g sample of antimony was completely reacted with 0.295 g of chlorine gas to form antimony chloride. Determine the empirical formula of the antimony chloride.
The empirical formula of the antimony chloride is SbCl₃
Data obtained from the question Antimony (Sb) = 0.338 gChlorine (Cl) = 0.295 gEmpirical formula =? How to determine the empirical formulaDivide by their molar mass
Sb = 0.338 / 122 = 0.0028
Cl = 0.295 / 35.5 = 0.0083
Divide by the smallest
Sb = 0.0028 / 0.0028 = 1
Cl = 0.0083 / 0.0028 = 3
Thus, the empirical formula of the compound is SbCl₃
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The nuclei of Three naturally occurring magnesium isotopes have the same number of protons but different numbers of neutrons . Explain Why ? Why does every atom of barium have 56 protons and 56 lectrons? Which subatomic particles in an atom determine its mass number ?
Based on atomic properties and structure:
Isotopes have the same proton number(atomic number) but different neutron numbers. An atom of barium has 56 protons and 56 neutrons in order to maintain electrical neutrality.The mass number of an atom is determined by the sum of protons and neutrons.What are isotopes?Isotopes are atoms of an element having the same atomic number but different mass numbers.
The difference in mass number is dues to different neutron numbers.
However, because they have the same proton number, they are atoms of the same element.
Neutral atoms contains equal number of protons and electrons.
An atom of barium has 56 protons and 56 neutrons in order to maintain electrical neutrality.
The mass number of an atom is determined by the sum of protons and neutrons.
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Caesium is in period 6 group 1. Would you expect caesium to have a higher or lower melting point than rubidium? give a reason for your answer
Answer:
A higher melting point than rubidium
Explanation:
Since Caesium has very strong bond btwn atoms hence requires high energy to break causing it to have a high melting point than rubidium
Answer:
Caesium would have a lower than Rubidium.
Explanation:
The reason is the periodic order.
If you are given the mass of a reactant in grams and want to calculate the mass of a product in grams, what are the three steps of the calculation you must perform?
The major 3 steps in determining the mass of a product from a given mass of a reactant would be to find the balanced equation of the reaction, determine the mole ratio of the reactant to the product, and then use the equivalent mole of the product from the reactant to find the desired variable.
Finding the mass of productsWith a given mass of a reactant, the mass of a product from a reaction can be determined in 3 major steps:
Get the balanced equation of the reaction and determine the mole ratio of the reactant to the product.Find the number of mole of the reactant from the given massFind the equivalent number of mole of the product using the mole ratioFrom there, the equivalent number of moles of the product can be used to find the mass of the product by multiplying with the molar mass of the product.
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Given the following equation: 2H2O 2H2 +0g What mass of oxygen would form from 5 moles of water?
Answer:
Answer: 2.5 mol O2 are needed to make 5 mol H2O, assuming H2 is in excess.
Explanation:
The dimensions of a box are measured to be 18.4 inches by 17.92 inches by 26 inches. The volume of the box can be found by multiplying these three dimensions. What is the volume of the box expressed to the correct number of significant figures?
A.
8,600 in3
B.
8,573 in3
C.
8,572.9 in3
D.
8,570 in3
Answer:
Explanation:The volume of the box is 8.6 × 10³ in².
V = lwh = 26 in × 18.4 in × 17.92 in = 8.6 × 10³ in²
Note: The answer can have only two significant figures because that is all you gave for the length of the box.
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When sodium hydroxide is dissolved in water within a beaker, you observe that the beaker becomes warm. This situation illustrates:
When sodium hydroxide is dissolved in water within a beaker, it is observed that the beaker becomes warm due to chemical reaction.
WHAT IS A CHEMICAL REACTION:A chemical reaction is a type of reaction that involves the rearrangement of atoms to form new substances.
The indications that a chemical reaction has occurred is:
Color Change.Production of an odor.Change of Temperature.Evolution of a gas (formation of bubbles)Precipitate (formation of a solid)Therefore, When sodium hydroxide is dissolved in water within a beaker, it is observed that the beaker becomes warm due to chemical reaction.
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What would a possible length for the missing
side length?
16
8
Answer:
24
Explanation:
the total of any 2 sides must be larger than the 3rd side. x is the 3rd side.
8 + x > 16
x > 8
16 + x > 8
x > -8
8 + 16 > x
24>x
x < 24
the second inequality tells us nothing as sides must be positive.
the third side must be between 8 and 24
Why is nitrate important in the ocean? How is it used biologically in the ocean?
A reaction of the form
aA - Products
gives a plot of 1/[A] vs time (in seconds) which is a straight line with a slope of 4.15 x 103. Assuming [A]o = 0.100 M, calculate the time in seconds) required
for the reaction to reach 38.3 percent completion.
The time taken for the second order reaction is 1494 seconds.
What is a second order reaction?A second order reaction is one in which a plot of the inverse of the concentration of a reactant versus time is a straight line and gives the slope of k which is the rate constant.
The formula for a second order reaction is;
1/[A] = kt + 1/[A]o
[A]o = 0.100 M
[A] = 0.100 M - (0.383 × 0.100 M) = 0.0617 M
k = 4.15 x 10^-3
t = ?
t = (0.0617 M)^-1 - ( 0.100 M)^-1/4.15 x 10^-3
t = 16.2 - 10/4.15 x 10^-3
t = 1494 seconds
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I NEED TOUR HELP, PLEASE.
G. A gas is at currently at STP. What volume will the
gas have at 100°C and 5.0 atm?
By titration, it is found that 68.1 mL of 0.143 M NaOH(aq) is needed to neutralize 25.0 mL of HCl(aq). Calculate the concentration of the HCl solution.
Answer:
Easy question to answer, you have the concentration and volume of the base and you have the volume of the acid. You need to find the concentration of the acid. C1V1 = C2V2 equation can be used here
Explanation:
Volume of NaOH = 0.0681 L (change mL into L)
Concentration or Molarity of NaOH = 0.143 mol/L
Volume of HCl = 0.025 L (change mL into L)
Concentration or Molarity of HCl = ???
C1V1 = C2V2
Rearrange equation to find C2
(C1 * V1) / V2 = C2
(0.143 * 0.0681) / (0.025)
C2 = 0.389532
Concentration or Molarity of HCl = 0.389 mol/L
Looking at the molecule images above, could the molecules of air get into the blood from the lungs? Why or why not? (Select ALL that apply)
a. Group of answer choices
b. The gas maolecules are really small, even smaller than glucose
c. Because the air molecules are so small, they can pass through the lung membrane into the blood like glucose did with the small intestine.
d. The air molecules can not pass through the membrane of the lungs because they are too large.
e. The air molecules are much larger than glucose molecules.
Answer:
b and d
Explanation:
why is water called a liquid ?
Answer: A liquid takes the shape of its container. Such as a cup with water. It has no definite shape. It has a definite volume.
1. (2) Which quantum state can not exist?
A
(1, 0, 0, 1/2)
B
(2, 0, 0, -1/2)
c
(2, 1, 0, 1/2)
D
(2,0, 1, -1/2)
Answer:
D
Explanation:
Reason being that if the principal quantum number is 2, the azimuthal quantum number can either be 0 or 1, and in this case it's 0. Since the azimuthal is 0 the magnetic quantum number must definitely be 0, not 1.
Why are humans more susceptible to concussions than bighorn sheep and woodpeckers?
Answer:
there is a gap in the human brain and the skull filled with fluid. woodpecker and bighorn sheep do not have this, so the brain doesn't recoil and hit the skull.
I will mark you as brainliest if you're correct
The table below contains concentration and rate data for a reaction involving three reactants. Use these data to determine the overall order of the reaction and the order with respect to M, N, and P.
Answer:
The order of reaction with respect to M, N, and P are 1, 0, and 3, respectively.
The overall order of reaction is 4.
Explanation:
We are given a table containing the concentrations of M, N, P, and the rate of the reaction, and we want to determine the overall order of the reaction and the order with respect to each reactant.
To do so, we can select two experiments from the list where two of the reactant concentrations are held constant and only one changes.
From trials 1 and 2, we can see that holding [N] and [P] constant while doubling [M] doubles the rate.
Therefore, because the rate is directly proportional to M, the reaction is first order with respect to M.
From trials 2 and 3, we can see that holding [M] and [P] constant while doubling [N] does not affect the rate.
Therefore, the reaction is zero order with respect to N.
From trials 1 and 4, we can see that holding [M] and [N] constant and doubling [P] leads to a eight-fold increase (2.6/0.32 ≈ 8).
Therefore, the reaction is third order with respect to P (2³ = 8).
Hence, our rate law is:
[tex]\displaystyle \text{Rate} = k[M]^1[N]^0[P]^3[/tex]
Where the order of reaction with respect to M, N, and P are 1, 0, and 3, respectively.
And the overall order is the sum of each individual reaction orders, or 4.
Copper can have improved wear resistance if alloyed with ceramic alumina, Al2O3. If a copper alloy has 7.7 wt % Al2O3, what is its composition in mol %?
The composition in mol% of the elements are :
4.91% of Al₂O₃ in alloy 95.08% of Cu in alloyGiven data :
Weight percentage of copper alloy = 7.7 wt %
Assume weight of alloy = 100 grams
Applying the weight percentagemass of Al₂O₃ in alloy = 7.7 gm
Mass of Cu in alloy = 100 - 7.7 = 92.3 gm
First step : calculate the mole of elements
i) moles of Al₂O₃ in alloy
= mass of Al₂O₃ in alloy / Atomic mass of Al₂O₃
= 7.7 gm / 102 gm/mol
= 0.075 mol
ii) moles of Cu in alloy
= mass of Cu in alloy / Atomic mass of Cu
= 92.3 gm / 63.5 gm/mol
= 1.45 mol
Therefore the total number of moles in the alloy = 0.075 + 1.45 = 1.525
Next step : Determine the mole percentages
i) Mole percentage of Al₂O₃ in alloy
= ( 0.075 ) / 1.525 * 100
= 4.91%
ii) Mole percentage of Cu in alloy
= ( 1.45 ) / 1.525 * 100
= 95.08%
Hence we can conclude that The composition in mol% of the elements are : 4.91% of Al₂O₃ in alloy and 95.08% of Cu in alloy.
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Someone can help me please??
Explanation:
tbh I really don't know but
How force and motion alone with energy works?
Which layer of Earth is responsible for the movement of tectonic plates?
when an impurity is added to pure water what happens to the boiling point of the mixture?
Boiling point of water is 100 degree Celsius at mean sea level. Boiling point is related to the vapour pressure of the solution. On adding an impurity, the vapor pressure of solution decreases. With an increase in concentration of solute, vapour pressure decreases, hence boiling point increases
Analyze the role coefficients in a chemical reaction play in stoichiometry
Answer:
This is known as the coefficient factor
Explanation:The balanced equation makes it possible to convert information about one reactant or product to quantitative data about another element.
How do you find the protons , neurons and electrons of an element ?
Answer:
For any element,
Atomic Number (Z) = The number of protons (P⁺) = The number of electrons (e⁻)
Hence,
Z = P⁺ = e⁻
For Neutron,
Mass number (A) – Atomic Number (Z)
N = A – Z
For Examples :-Oxygen atom (O)Atomic Number = 8Proton = 8Electron = 8Mass Number = 16Neutron = 16 – 8 = 8
-TheUnknownScientist 72
30) The number of calories needed to raise the temperature of 32 g of water from 12°C to 54 °C is A) 380 cal B) 1.3 cal C) 1300 cal D) 1700 cal E) 0.76 cal