Answer:
ΔS < 0
ΔH < 0
Explanation:
Recall that the process is crystallization. Crystallization involves conversion of aqueous ions back to solid. This process decreases the entropy of the system hence ΔS is negative.
But remember that a process is only spontaneous when ΔG <0 (negative). From;
ΔG = ΔH - TΔS
If ΔS is negative, then (-TΔS) must be positive since ΔS is negative. The only way to make the process spontaneous is to make ΔH negative so that ΔG also becomes negative.
when 0.20 m nh4cl (aq) and 0.20 m naoh(aq) are mixed, the reaction represented by the equation above occurs and a strong smell of ammonia, nh3 is observed. based on this information, which of the following statements is true? And Why??
Answer:
b ) NH₄⁺ is a stronger acid than H₂O ( l )
Explanation:
NH₄⁺ + OH⁻ = NH₃ + H₂O .
NH₄⁺ is a conjugate acid of NH₃
OH⁻ is a conjugate base of H₂O .
NH₄⁺ is capable of giving H⁺ to OH⁻ to produce H₂O so it is stronger acid than H₂O .
Had H₂O been stronger , it would have given H⁺ to NH₃ to produce NH₄⁺ but it does not happen .
So NH₄⁺ is a stronger acid than H₂O ( l ) .
difference between elimination and substitution
Answer:
elimination:it is the act of discharging or excreting waste product from body is elimination.
substitution:the act/action of replacing someone or something with another person or thing.
If you have a metal oxide and water in a combination reaction, what will the product be?
a
Acid
b
Molecular
с
Carbon Dioxide
d
Base
Answer:
A
Explanation:
You have a gas at a volume of 9.71 L at a pressure of 209 torr and at 10.1 °C. What
temperature (in °C) would the gas need to reach at constant volume to reach
364 torr? 760 torr = 1 atm
Answer:
219.95 °C
Explanation:
Given data:
Volume of gas = 9.71 L
Initial pressure = 209 torr (209/760 = 0.275 atm)
Initial temperature = 10.1 °C (10.1 +273 = 283.1 K)
Final temperature = ?
Final pressure = 364 torr (364/760 =0.479 atm)
Solution:
According to Gay-Lussac Law,
The pressure of given amount of a gas is directly proportional to its temperature at constant volume and number of moles.
Mathematical relationship:
P₁/T₁ = P₂/T₂
Now we will put the values in formula:
0.275 atm / 283.1 K = 0.479 atm/T₂
T₂ = 0.479 atm × 283.1 K/ 0.275 atm
T₂ = 135.6 atm. K /0.275 atm
T₂ = 493.1 K
Kelvin to °C:
493.1 K - 273.15 = 219.95 °C
To measure the amount of chlorine in a well-boring fluid, an analytical chemist adds silver nitrate solution to a sample of the fluid and collects the solid silver chloride product. When no more is produced, she filters, washes and weighs it, and finds that has been produced. The balanced chemical equation for the reaction is:Cl(aq) + AgNO3(ag)------- AgCl(s) + NO3- (ag) o What kind of reaction is this? a. acid-base b. redox orvcap c. precipitation
Answer:
c. precipitation
Explanation:
Let's consider the following balanced net ionic equation.
Cl⁻(aq) + AgNO₃(ag) ⇒ AgCl(s) + NO₃⁻ (ag)
What kind of reaction is this?
a. acid-base. No, because the reactants are not acids and bases.
b. redox. No, because all the species have the same oxidation numbers in the reactants and the products
c. precipitation. Yes, because an insoluble compound (AgCl) is produced, which then precipitates.
It is the one in the middle i listened to the first person and i got it wrong by the way this is the answer for edge2020 sience review
Answer:
for what school? It's different for all sadly :(
Explanation:
Which of the following phrases helps you to correctly remember the order of classification levels?
A) Kings cut pickles on fat green stools.
B) Kings played cards for one great second.
C) Kings play cards on fat green stools.
D) Kings cart plums for Greeks on stools.
ОООО
Answer: The correct answer would be C.
Explanation: The order of classifications are kingdom, phylum, class, order, family, genus, and species. :)
Answer B
Explanation:Which of the following phrases helps you to correctly remember the order of classifition levels?
the answer is B
Please help me due today at 7:00pm please help giving more points please help me
Which of the following elements is the best conductor of electricity?
hydrogen
magnesium
carbon
iodine
Answer: carbon
Explanation:
Answer: hydrogen
Explanation: Hydrogen is usually considered an energy carrier, like electricity, as it must be produced from a primary energy source such as solar energy, biomass, electricity (e.g. in the form of solar PV or via wind turbines), or hydrocarbons such as natural gas or coal. On the other hand, magnesium, carbon, and iodine are not often used as conductors of electricity because they either have a covalent bond that does not generate electricity or because they contain particles or compounds that can’t be installed inside electric installations.
The gravitational pull of the Moon is much less than the gravitational pull of Earth. Consider an object with a ma of 10 kilograms that weighs 22 pounds on Earth Which statement describes the object on the Moon? A. Its mass would be much greater. B. lts weight would be much greater OOOO C. Its we ght would be the same O D. Its mass would be the same.
Answer: D.
Explanation: I got it right and the dude above me is spreading fake news
The process of cells dividing into two identical cells is called?
Answer:
mitosis
Explanation:
25 atoms W mass in grams
Answer The mass in grams for 25 atoms W is 763.10e-23.
The W is a symbol of tungsten. 25 atoms of tungsten gives 4596 mass in gram.
What are atoms?Atoms can be defined as the smallest unit into which matter can be divided without release of electrically charged particle. It is the smallest unit that form chemical elements.
Atoms are made up of electron, protons and neutrons.
To calculate mass in gram for an atom is
Mass in gram = number of atoms x atomic mass
Atomic mass of W i.e. tungsten is 183.84 u.
So mass in gram of W = 25 atoms x 183.84 u
= 4596 g
Thus, W is a symbol of tungsten. 25 atoms of tungsten gives 4596 mass in gram.
To learn more about atoms, refer to the link below:
https://brainly.com/question/1566330
#SPJ2
How could you draw a model of the element copper to show that it is different from the element gold?
please help me hope you understand helllllllpppppppppppppppppp meeeeeeeeee
Answer:
You can put what they are made out of so show how different they are
The data part of Lab Hydrates in Edgunuity
Answer:
Hydrates! :D
Explanation:
What is the order of reagents that were added to the test tube used to carry out the synthesis of dibenzalacetone?
Answer:
An experiment designed to synthesize dibenzlacetone would have reagents added in the following order:
Sodium hydroxide, NaOHEthanolAcetoneBenzaldehydeYellow precipitate would be re-crystallized from ethyl acetate.Explanation:
It is worth noting that the reaction is a type of mixed aldol condensation reaction, which uses sodium hydroxide as base.
I hope this is was a clear solution to the problem.
If the pressure exerted by a gas at 25 degrees C in a volume of 0.044 L is 3.81 atm, how
many moles of gas are present?
Answer:
0.0069 mol
Explanation:
Given data:
Temperature = 25°C
Volume of gas = 0.044 L
Pressure of gas = 3.81 atm
Number of moles of gas = ?
Solution:
The given problem will be solve by using general gas equation,
PV = nRT
P= Pressure
V = volume
n = number of moles
R = general gas constant = 0.0821 atm.L/ mol.K
T = temperature in kelvin
Now we will convert the temperature.
25+273 = 298 K
3.81 atm × 0.044 L = n × 0.0821 atm.L/ mol.K × 298 K
0.17 atm.L = n ×24.47 atm.L/ mol
n = 0.17 atm.L/24.47 atm.L/ mol
n = 0.0069 mol
The moles of gas has a pressure of 3.81 atm and volume 0.044 L has been 6.85 mmol.
The gas has been exhibiting the ideal nature. According to the ideal gas equation:
PV =nRT
P = pressure = 3.81 atm
V = volume = 0.044 L
R = constant = 0.0821
T = temperature = 25 [tex]\rm ^\circ C[/tex] = 298 K
Substituting the value:
3.81 [tex]\times[/tex] 0.044 = n [tex]\times[/tex] 0.0821 [tex]\times[/tex] 298
0.16764 = 24.4658 n
n = 0.00685 mol
n = 6.85 mmol
The moles of gas has a pressure of 3.81 atm and volume 0.044 L has been 6.85 mmol.
For more information about the pressure of a gas, refer to the link:
https://brainly.com/question/17254541
Give the name for the ionic compound NiN
Answer: potassium chloride
True or False.
E = mc2 explains why a small amount of mass can produce a great deal of energy.
an experiment should be carried out in the fume cupboard if it involves
Answer:
if you are working with a substances that produce or generate toxic or harmful fumes, vapours, gases, dust or chemical aerosols
it should be carried out in a fume cupboard to eliminate or reduce the risk of exposure to an acceptable and safe level.
A
is often written as an if/then statement.
O prediction
O law
O theory
O guess
Which element has properties similar to neon?
A. Aluminum
B. Argon
C. Arsenic
D. Silver
Answer:
B. Argon has similar properties to neon.
Explanation:
hope it helps u.
The statement of element has properties similar to neon is "argon."
What is an element?A substance that cannot be split into smaller components using normal chemical processes. Elements are chemical compounds that correspond to a single spot on the current periodic table. Elements are made up of only one type of atom.
Argon, like neon, is classified as a noble gas. That is, argon is a member of the noble gas family of chemicals.
Both neon and argon are positioned in the group 8, which means they have eight electrons in their outermost electron shell, making them noble and inert gases. They are very nonreactive since they already have a complete and stable octet structure and don't need to connect to other elements.
Hence the correct option is B.
Learn more about element here
https://brainly.com/question/13794764
#SPJ2
What is chemical potential energy?
A) energy stored by atoms
B) energy from gravity
C) energy of motion
D) energy stored in height differences
Answer:
A) energy stored by atoms
Explanation:
Chemical potential energy is the energy stored by atoms. This energy form can be converted to other forms of energy.
For most of the energy needs in the biosphere, this form of energy is very important. When bonds are broken, this energy is released as it is converted to other forms of energy. The food we eat contains chemical potential energy within its structure.Complete the chemical equation for this reaction.
Ca + .......H2O → Ca(OH)2 + ...............
The ΔHvap of a certain compound is 47.45 kJ·mol−1 and its ΔSvap is 59.15 J·mol−1·K−1. What is the boiling point of this compound?
Answer:
802.2 K
Explanation:
To solve this problem we can use the formula:
Tb = ΔHvap / ΔSvapWhere Tb is the boiling point (in K).
We already know the values of both ΔHvap and ΔSvap, so we calculate Tb:
ΔHvap = 47.45 kJ·mol⁻¹ = 47.45x10³J·mol⁻¹Tb = 47.45x10³J·mol⁻¹/59.15 J·mol⁻¹·K⁻¹
Tb = 802.2 KSo the boiling point of the compound is 802.2 K (or 529 °C)
The boiling point of the compound whose ΔHvap is 47.45 KJ is 802.2 K.
What is the boiling point?The temperature at which a liquid's vapor pressure matches the pressure surrounding the liquid is known as the boiling point of that substance.
By the formula of colligative property
[tex]Tb = \dfrac{\Delta Hvap}{\Delta Svap }[/tex]
Where Tb is the boiling point (in K).
ΔHvap is 47.45 kJ·mol⁻¹
ΔSvap is J·mol−1·K⁻¹
Putting the values
[tex]Tb = \dfrac{47.45}{59.15 } =802.2 K.[/tex]
Thus, the boiling point is 802.2 K or 529° C.
Learn more about boiling point
https://brainly.com/question/2153588
The amount of energy required to raise the temperature of 1 kilogram of a substance by 1 kelvin is called its
I hope it'll help
thanks...
I NEED HELP FAST THIS IS DUE AT 9:00
All atoms of the same ___________ have the same properties
Elements
Compounds
Mixtures
Chemicals
why PbS is less soluble in water
Answer:
PbS shows a very low solubility in water, and it is insoluble in organic solvents. Any "dissolution" process in acids (hydrochloric acid, nitric acid, aqua regia) is accompanied with a chemical reaction whereby H2S is liberated and the corresponding soluble Pb2+ salts are formed. hope that helps
Please it’s due today at 6:00pm please help me will mark the brainiest and more points please help me
Answer:
A SUV their more dynamic if u say so (Dads a car person) But he could be wrong
Maya adds six grams of sugar to water bottle containing 14 g of warm water what is the total weight of the sugar and water
Answer:
20g
Explanation:
14g+6g=20g
Small changes in _________ protein structure may lead to big changes in _________ protein structures.
A. secondary; tertiary
B. primary; secondary
C. primary; tertiary
D. tertiary; secondary
Answer:
B. primary; secondary
Explanation:
Small changes in primary structure can result in large changes in protein shape and function. Secondary structure describes regions where the polypeptide is folded into localized shapes. There are two types of secondary structure (alpha helix and Beta pleated sheet).