Answers
Answer:
ΔS⁰ = -181.1J/molK
Explanation:
ΔS⁰ of a reaction is defined as the sum of the entropies of the reactants times its reaction coefficient minus the sum of the entropies of the products times its reaction coefficient. For the reaction in the problem:
ΔS⁰ = 2*S{NaCl(s)} - (2*S{Na(s)}+S{Cl2(g)})
ΔS⁰ = 2*72.1J/molK - (2*51.1J/molK + 223.1J/molK)
ΔS⁰ = -181.1J/molKRelated Questions
Calculate the amount of money an accountant receives from a bank if he invests
$120 000 annum for 9 years at 10% per annum compound interest.
Answers
Answer:
The amount is $282953.72 using the given formula
what is the difference between the chemical bonds formed in molecules of O2 and the chemical bonds formed in the crystal of NaCi
Answers
Explanation:
The bond between two oxygen atoms is covalent (covalent bonding is bonding between Non metals (the electrons are shared)).
The bond between the Na and Cl (NaCl) is ionic (ionic bonding is bonding between a metal (in this case the Na) and a non metal (the Cl). This type of bonds deals with the metal losing electrons and the non metal gaining electrons. The metal therefore become positively charged (so it becomes ionic) and the non metals gain electrons and become negatively charged (also becomes ionic/ forms an ion). The opposite charges attract each other and this is why they bond.
Someone please help fast!!!please
Answers
Answer:
7276783
Explanation:
8765467
Edward is gathering physical evidence at the scene of a crime. He finds a fingerprint pressed into the wax of a candle. What type of fingerprint is this?
Answers
The type of fingerprint found at the crime scene in this scenario is referred to as plastic.
What is Plastic fingerprint?This is the of fingerprint which is three dimensional and can be easily seen with the human eye.
Plastic fingerprint can be made by pressing the finger on substances such as wax, paint etc.
Read more about Fingerprint here https://brainly.com/question/11165604
#SPJ1
Answer:
the answer would be molded I believe.
choices are Latent,patent, inadmissible molded,trace.
(1) The solubility of Salt AB2(S) IS 5mol/dm^3.
a. Obtain an expression for the solubility product of AB2(S),in terms of s.
b. Calculate the Ksp of AB2,given that solubility is 2.4x10^3mol/dm^3
Answers
Answer:
a. Ksp = 4s³
b. 5.53 × 10⁴ mol³/dm⁹
Explanation:
a. Obtain an expression for the solubility product of AB2(S),in terms of s.
AB₂ dissociates to give
AB₂ ⇄ A²⁺ + 2B⁻
Since 1 mole of AB₂ gives 1 mole of A and 2 moles of B, we have the mole ratio as
AB₂ ⇄ A²⁺ + 2B⁻
1 : 1 : 2
Since the solubility of AB₂ is s, then the solubility of A is s and that of B is 2s
So, we have
AB₂ ⇄ A²⁺ + 2B⁻
[s] [s] [2s]
So, the solubility product Ksp = [A²⁺][B⁻]²
= (s)(2s)²
= s(4s²)
= 4s³
b. Calculate the Ksp of AB₂, given that solubility is 2.4 × 10³ mol/dm³
Given that the solubility of AB is 2.4 × 10³ mol/dm³ and the solubility product Ksp = [A²⁺][B⁻]² = 4s³ where s = solubility of AB = 2.4 × 10³ mol/dm³
Substituting the value of s into the equation, we have
Ksp = 4s³
= 4(2.4 × 10³ mol/dm³)³
= 4(13.824 × 10³ mol³/dm⁹)
= 55.296 × 10³ mol³/dm⁹
= 5.5296 × 10⁴ mol³/dm⁹
≅ 5.53 × 10⁴ mol³/dm⁹
Ksp = 5.53 × 10⁴ mol³/dm⁹
Which of the following is not a reason why actual yield is less than theoretical yield?
A. presence of impure reactants
B. conservation of mass
C. competing side reactions
D. loss of product during purification
Answers
Recall that percent yield is given by: %Yeild = actual yeild/theoretical yeild x100
During experiments, there are errors made:
• uncertainty in measurements
• losses of reactants and products
• impurity in reactants
• losses during separation (e.g. filtration or purification)
• Some side reactions might also happen.
Among the given options, only conservation of mass does not contribute to a lower actual yield compared to the theoretical yield.
The option that isn't a reason why the actual yield is less than theoretical yield is B. conservation of mass.
It should be noted that the formula for the percent yield is given as:
= Actual yield / Theoretical Yield × 100
The actual yield is experimentally determined, and it's the quantity of a product that is gotten from a chemical reaction.The theoretical yield is the amount of product that can be obtained from a reaction when the reactants are changed to products.Actual yield can be less than theoretical yield due to the presence of impure reactants ,competing side reactions, and loss of product during purification.
In conclusion, the correct option is B.
Read related link on:
https://brainly.com/question/23854893
sucrose (sugar)crystals obtained from sugarcane and bet root are mixed together .with it be a pure substancesor a mixture ?give reasons
Answers
Answer:
It will be a pure substance (compound) because chemical composition of sugar crystals will be the same whether obtained from sugarcane or from beet root.
hope it's help you plz mark as brain list ...!!El método de cristalización sirve para separar agua salada y obtener ambos componentes por separado
Answers
Answer:
Si.
Explicación:
Sí, el método de cristalización se utiliza para separar la sal del agua y obtener los componentes de la sal y del agua por separado. La cristalización es un método o técnica que se utiliza para purificar compuestos sólidos. Este proceso funciona mejor debido a las diferentes solubilidades del compuesto deseado y las impurezas que están presentes en un solvente dado. El proceso de cristalización implica enfriar agua salada para formar cristales de hielo puro. Luego, los cristales de hielo se separan de la salmuera no congelada, se lavan para eliminar la sal residual y luego se derrite la solución para producir agua dulce.
The weak base ionization
constant (Kb) for HS is
equal to:
Answers
Answer:
[H2S][OH-
[HS-]
Explanation:
hope it help
plss brainlys me
Answer:
[H2S][OH-]
_________
[HS-]
Explanation:
You welcome.
what does the second law of thermodynamics say about entropy
Answers
Answer:
The entropy and the systems surrounding it tend to increase.
Answer: The entropy in a system and its surroundings tends to increase.
Explanation:
3.3.2 Quiz: Entropy (a p e x)
How can graphs be used to picture a chemical reaction
Answers
Which substance is a basic oxide?
Answers
The oxide that gives a base in water is known as a basic oxide. An amphoteric solution is a substance that can chemically react as either acid or base. However, it is also possible for an oxide to be neither acidic nor basic, but is a neutral oxide.
Which of the following has the highest entropy?
O A. Water
O B. Water solution
C. Water vapor
O D. Ice
Answers
Answer:
C. WATER VAPOUR
these are gaseous in state so gases have more entropy than other states.
nope it helps
have a nice day
During the process of condensation, water vapor
A. releases 334 J/g of heat energy
B. releases 2260 J/g of heat energy
C. gains 334 J/g of heat energy
D. gains 2260 J/g of heat energy
Answers
Answer:
A
Explanation:
it releases 4
334 J/g of heat energy
hope its correct
how to determine the aspects for core and valence electrons in a periodic table. How comes in some elements like cobalt the 3d is on the valence side and arsenic the 3d is on the core side.
Answers
Answer:
See explanation
Explanation:
The electron configuration of an atom in an element determines the property of the atom. The core electrons are found inside the atom while the valence electrons are found on the outermost shell of the atom.
For cobalt, the outermost shell electron configuration is; [Ar] 3d7 4s2. The 3d7 and 4s2 are found in the valence shell of cobalt.
For arsenic, the electronic configuration is [Ar] 3d¹⁰ 4s² 4p³. The valence electrons are 4s2, 4p3. The 3d electrons are found inside the arsenic atom.
How many liters does 3 moles of Oxygen gas occupy at standard temperature and pressure
Answers
Answer: 3 moles of oxygen at STP will occupy a volume of 3×22. 4=67. 2 L.
when magnesium reacts with chlorine, the chlorine atom gain electrons. what happens to chlorine in this reaction?
a. it is oxidized
b. it is synthesized
c. it is decomposed
d. it is reduced
Answers
Answer:
D
Explanation:
Reduction refers to gain in electrons. Hence it is D
Oxidation occurs when the element loses electrons. Hence A is wrong
Which is a difference between Volume and Surface Area?
Answers
Answer:
Surface area is the sum of the areas of all the faces of the solid figure. ... Volume is the number of unit cubes that make up a solid figure. Volume is the amount of space inside of the solid figure.
Explanation:
PLEASE HELP ASAP Put these events in order, from earliest to latest.
-the first fusion bomb is tested
-uranium atoms are split
-atomic bombs are dropped on Japan at the end of world war ll
-the first nuclear-powered submarine is put into action
-Enrico fermi creates the first known nuclear chain reaction
Answers
Answer:
1) Uranium atoms are split
2) Enrico Fermi creates the first known nuclear chain reaction
3) Atomic bombs are dropped on Japan at the end of WWll
4) The first fusion bomb is tested
5) The first nuclear-powered submarine is put into action
The most outer solid portion of
the planet Earth
Answers
Answer:
The lithosphere is the most outer solid portion of
he most outer solid portion ofthe planet Earth.
crust is the outermost layer of earth.
what are the difference between ionic bond and covalent bond?
Which is stronger?
Answers
QUËSTIONS :- what are the difference between ionic bond and covalent bond?
IONIC BONDS :- THEY R BONDS WHICH R FORMED DUE TO THE COMPLETE TRANSFER OF ELECTRONS BETWEEN TWO ATOMS
COVALENT BONDS :- THEY R THE BONDS WHICH R FORMED DUE TO INCOMPLETE TRANSFER OF ELECTRONS BETWEEN TWO ATOMS
IONIC BONDS R MORE STRONGER.
Explanation:
Ionic bond is much stronger than covalent bond because it involves complete transfer of electrons because of which there is formation of cation and anion and there exist huge electrostatic forces of attraction. They also have high melting and boiling point which proves that the ionic bond is very strong.
Differences between ionic bond and covalent bond :
Ionic Bonds. Covalent Bonds
Polarity :High. Low
Shape : No definite shape. Definite shape
Melting Point :High Low
Boiling Point: High Low
Which two of the following changes of state involve solids?
Select two (2) answers
A. melting
B. boiling
C. freezing
D. evaporating
Answers
Answer:
Answer is A... Melting and freezing
Which alkane is the isomer of butane called 2-methylpropane? A skeletal model of a 4-carbon chain has a straight line extending from the second and third carbons in the chain. A three-carbon chain has a straight line extending from the center carbon. A 5-carbon chain. A three-carbon chain has 2 lines extending from the same side of the center carbon.
Answers
Answer:
A three-carbon chain has a straight line extending from the center carbon.
Explanation:
Isomers are compounds having the same molecular formula but different structural formulas.
Butane and 2-methylpropane are constitutional isomers. Constitutional isomers differ in the way that the constituent atoms are connected to each other.
Butane is a straight chain compound while the compound 2-methylpropane consists of a three-carbon chain which has a straight line extending from the center carbon.
Answer:
it is b on edge 2021
Explanation:
Calculate the heat energy, in kJ, required to melt 1.0kg of ice at 0 degrees celcius.
Show all working out
Answers
Answer:
here is the answer. Feel free to ask for more chem help <3
Please help me to answer this question.
i have to submit tomorrow.
Answers
Answer:
The law of conservation of mass states that mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations. According to the law of conservation of mass, the mass of the products in a chemical reaction must equal the mass of the reactants.
Help please I’ll give you brainless
Answers
Answer:
Step 9
Explanation:
The reason i selected step 9, is if you take a look at the picture hes setting up a funnel,With filter paper and if you take a look at number ''9'' questions it says set up a funnel, filter paper and filter flask which is shown in the picture on top that's how i got my answer
The second reaction in the formation of sulfuric acid occurs slowly.
2 upper S upper O subscript 2 (g) plus upper O subscript 2 (g) right arrow 2 upper S upper O subscript 3 (g).
NO2 is added to the reaction to speed it up. In which form would this substance be a homogeneous catalyst for this reaction?
NO2(g)
NO2(l)
NO2(s)
NO2(aq)
Answers
Answer: The correct option is [tex]NO_2(g)[/tex]
Explanation:
A catalyst is defined as the chemical species that increases the reaction rate but does not participate in it and is left behind after the completion.
A homogeneous catalyst is one that is present in the same phase as the reactants and products.
A heterogeneous catalyst is one that is present in different phase as that of reactants and products.
For the given chemical reaction:
[tex]2SO_2(g)+O_2(g)\rightarrow 2SO_3(g)[/tex]
As all the reactants and products are in gaseous state so, the homogeneous catalyst must also be in the gaseous state only.
Hence, the correct option is [tex]NO_2(g)[/tex]
Answer:
a
Explanation:
Electronegativity6. Which one of the following bonds is the least polar one?
options:
C-F
C-Cl
C-Br
C-I
Answers
It can also be wrong but that’s my opinion
make the following conversion 60.2mg = ___ g
Answers
Answer:
0.0602g
Explanation:
60.2mg is equal to 0.0602grams.
In what method Copper sulphate solution change blue to colourless ??
Answers
Answer: When an iron nail immersed in the solution of copper sulphate than iron displaces copper from the solution of copper sulphate because iron is more reactive than copper. Therefore copper sulphate solution colour changes from blue to pale green.