Answer:
61.131%
This is the percentage of iodine in zinc iodate.
What would be the formula of the precipitate that forms when lead (II) nitrate (aq) and potassium
sulfate (aq) are mixed?
O H₂O 0
O Pb2SO4
PbSO
ОРЫК,
O K(NO3)2
Each carbon atom of benzene is involved in two ________
Answer:
Benzene is a combination of carbon and hydrogen atoms. The hybridization is sp2 type. During the hybridization of benzene, each carbon atom forms different bonds with two other similar carbon atoms instead of just one.
hope it helps!
please mark as the brainliest!
What category of biological molecules are steroids included in?
Answer:
Lipids
Explanation:
Lipids are a class of macromolecules that are nonpolar and hydrophobic in nature. Major types include fats and oils, waxes, phospholipids, and steroids.
Hope this helps!
50 points
In the image below, light is displayed as particles called photons. Research to find out what photons are and then explain in your own words why they can be useful for modeling light.
Answer:
A photons is a particle representing a quantum of light or other electromagnetic radiation. A photon carries energy proportional to the radiation frequency but has zero rest mass.
Explanation:
Light consists of packets of energy (photons) that can only interact with the atoms and molecules of matter by being absorbed or emitted in discrete units. ... Photons carry momentum and energy like particles, but they also have a frequency and a wavelength like a sinusoidal wave. Thanks to photons we know that all quantum particles have both the properties of waves and particles. I hope it helps✌️
Faces:
13. Explain why a solution containing both NH3 and NH4Cl is less basic than a solution
containing only NH3 of the same concentration.
Answer:
In a solution containing ammonia solution and ammonium chloride, ammonia hydrolyses in water to produce hydroxyl ions.
NH3 +H2O → NH4+ + OH-
Ammonium chloride ionises in the solution to produce ammonium ions and chloride ions where the ammonium ions undergo hydrolysis to produce more ammonia solution.
[tex]NH _{4} Cl→NH _{4} {}^{ + } + Cl {}^{ - } [/tex]
A student titrating a sample of a powdered aspirin tablet to find out how much acetylsalicylic acid is in the sample finds that it requires 15.5 mL of a 0.109 M sodium hydroxide solution to neutralize the acid in the sample. How many milligrams of acetylsalicylic acid did the sample contain? Use the correct number of significant figures and do not include units or your answer will be counted wrong.
Answer:
305 mg
Explanation:
The equation of the reaction is;
C9H8O4 + NaOH = C9H7O4Na + H2O
Amount of NaOH reacted = 15.5/1000 L * 0.109 M = 1.69 * 10^-3 moles
Since the reaction has a 1:1 mole ration, 1.69 * 10^-3 moles of acetylsalicylic acid reacted.
Assuming all the acetylsalicylic acid reacted, then mass of acetylsalicylic acid present = 1.69 * 10^-3 moles * 180.158 g/mol = 0.305 g or 305 mg
Match the procedural step to its purpose by dragging each step in the written procedure for the Fischer esterification of benzoic acid with methanol in the presence of mineral acid into the appropriate box. Purpose: Flat-bottomed flasks transfer heat in an uneven fashion, and may fracture if heated strongly. Procedure: Purpose: Methanol, which is used as a reagent and solvent, is flammable. Prodedue: Purpose: The unreacted carboxylic acid was neutralized under mild conditions. Procede: Purpose: Water needs to be removed before the liquid ester product is collected. Procedure:
Answer:
Explanation:
The task in this question is to match the right procedure to its purpose. It explains the procedure for the preparation of Fischer Esterification. Fischer Esterification Mechanism should incorporate the ceaseless expulsion of water from the framework or the use of a huge amount of excess alcohol since the general reaction is reversible. Fischer Esterification act as an organic reaction that is utilized to change over carboxylic acids within the sight of excess alcohol and a solid corrosive catalyst (acid) to give an ester as the eventual outcome.
Procedure Purpose
[tex]\text{Flat bottomed flask transfer}\\ \\ \text{ heat in an uneven fashion and } \\ \\ \text{ may fracture if heated strongly}[/tex] [tex]\text{The reagents were added to a} \\ \\ \text{round bottom flask prior to the }\\ \\ \text{reaction being heated under reflux}[/tex]
[tex]\text{Methanol which used as a reagent} \\ \\ \text{and solvent is flammable}[/tex] [tex]\text{The solution of benzoic acid and }\\ \\ \text{methanol was heated on steam bath}[/tex]
[tex]\text{The unreacted carboxylic acid was} \\ \\ \text{neutralized under mild conditions}[/tex] [tex]\text{The reaction mixture was washed} \\ \\ \text{ with sodium bicarbonate solution}[/tex]
[tex]\text{Water needs to be removed before the} \\ \\ \text{ liquid ester product was collected}[/tex] [tex]\text{Magnesium sulphate is added to the} \\ \\ \text{ dichloromethane layer before} \\ \\ \text{ the solvent is distilled off}[/tex]
One liter of N (g) at 2.1 bar and two liters of Ar(g) at 3.4 bar are mixed in a 4.0-L 2 flask to form an ideal-gas mixture. Calculate the value of the final pressure of the mixture if the initial and final temperature of the gases are the same. Repeat this calculation if the initial temperatures of the N (g) and Ar(g) are 304 K and 402 K, respectively, and the final 2 temperature of the mixture is 377 K. (Assume ideal-gas behavior.)
Answer:
Explanation:
From the information given:
Step 1:
Determine the partial pressure of each gas at total Volume (V) = 4.0 L
So, using:
[tex]\text{The new partial pressure for }N_2 \ gas}[/tex]
[tex]P_1V_1=P_2V_2[/tex]
[tex]P_2=\dfrac{P_1V_1}{V_2} \\ \\ P_2=\dfrac{2.1 \ bar \times 1\ L}{4.0 \ L} \\ \\ P_2 = 0.525 \ bar[/tex]
[tex]\text{The new partial pressure for }Ar \ gas}[/tex]
[tex]P_2=\dfrac{P_1V_1}{V_2} \\ \\ P_2=\dfrac{3.4 \ bar \times 2 \ L}{4.0 \ L} \\ \\ P_2 = 1.7 \ bar[/tex]
[tex]Total pressure= P [N_2] + P[Ar] \ \\ \\ . \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ = (0.525 + 1.7)Bar \\ \\ . \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ = 2.225 \ Bar[/tex]
Now, to determine the final pressure using different temperature; to also achieve this, we need to determine the initial moles of each gas.
According to Ideal gas Law.
[tex]2.1 \ bar = 2.07 \ atm \\ \\3.4 \ bar = 3.36 \ atm[/tex]
For moles N₂:
[tex]PV = nRT \\ \\ n = \dfrac{PV}{RT}[/tex]
[tex]n = \dfrac{2.07 \ atm \times 1 \ L }{0.08206 \ L .atm. per. mol. K \times 304 \ K}[/tex]
[tex]n = 0.08297 \ mol \ N_2[/tex]
For moles of Ar:
[tex]PV = nRT \\ \\ n = \dfrac{PV}{RT}[/tex]
[tex]n = \dfrac{3.36 \ atm \times 1 \ 2L }{0.08206 \ L .atm. per. mol. K \times 377 \ K}[/tex]
[tex]n = 0.2172 \ mol \ Ar[/tex]
[tex]\mathtt{total \ moles = moles \ of \ N_2 + moles \ of \ Ar}[/tex]
[tex]=0.08297 mol + 0.2037 mol \\ = 0.2867 mol gases[/tex]
Finally;
The final pressure of the mixture is:
[tex]PV = nRT \\ \\ P = \dfrac{nRT}{V} \\ \\ P = \dfrac{0.2867 \ mol \times 0.08206 \ L .atm/mol .K\times 377 K}{4.0 \ L}[/tex]
P = 2.217 atm
P ≅ 2.24 bar
150.0 mL of a gas is collected at 50 kPa, What will the volume be at 125kpa?
A. 50 mL
B. 175 mL
C. 60 mL
D. 200 mL
Answer:
C. 60 mL
Explanation:
Boyle's Law P₁V₁ = P₂V₂
(50kPa)(150.0mL) = (125kPa)(V₂)
V₂ = 7500/125
V₂ = 60 mL
The barometer at an indoor pool reads 105.00 kPa. If the temperature in the room is 26c, what is the patial pressure of the "dry" air??
a. 30.88 kPa
b. 101.60 kPa
c. 108.40 kPa
d. 357.00 kPa
Answer:
Option B. 101.60 KPa
Explanation:
From the question given above, the following data were obtained:
Total pressure (Pₜ) = 105.00 KPa
Partial pressure of wet gas (Pᵥᵥ) at 26 °C = 3.4 KPa
Partial pressure of dry gas (Pₔ) =?
Total pressure = partial pressure of dry gas + partial pressure of wet gas
Pₜ = Pₔ + Pᵥᵥ
105 = Pₔ + 3.4
Collect like terms
105 – 3.4 = Pₔ
Pₔ = 101.60 KPa
Therefore, the partial pressure of the dry gas is 101.60 KPa
words that mean the same thing
decrease,
diminish,
dwindle
Answer:
Subside
Explanation:
Answer:
lower, reduce, decline
Explanation:
HELPP PLZZZZ
Which fossil fuel are items such as plastics and rubber made from?
coal
oil/petroleum
natural gas
gasoline
Answer:
Hey mate.....
Explanation:
This is ur answer....
Natural GasPlastics are produced from natural gas, feedstocks derived from natural gas processing, and feedstocks derived from crude oil refining.
Hope it helps,
Mark me brainliest....
:D
Answer:
Oil and natural gas are chemically broken down into small compounds that combine to form plastic.
Water is stored in the _________________________ until it is used by the cell.
Answer:
cell sap :)
Explanation:
Answer:
well
Explanation:
Softening of water is the application of
Answer:
Water softening is the process of removing the dissolved calcium and magnesium salts that cause hardness in water
Explanation:
How does the air temperature at the bottom of a mountain compare with the air temperature at the top of the mountain?
A. The air is colder at the bottom.
B. The air is warmer at the top.
C. The air temperature at the top is lower.
D. The air temperature is the same.
Explanation: C) the air temp. at the top is lower
According to an energy pyramid model, which trophic level is expected have the largest biomass in land ecosystems ?
Answer:
According to an energy pyramid model, Producer is expected have the largest biomass in land ecosystems
Explanation:
In a trophic level, the producers possess the largest biomass. With the increasing trophic level, the biomass reduces. Hence, the producers at the base have high biomass.
On terrestrial ecosystem, the producers are the plants and trees and hence the greatest biomass exists in the plants and trees.
Hence, in an energy pyramid model, Producer is expected have the largest biomass in land ecosystems
Please help due tofay
Answer:
I only know the answer to the second one, The bond that occurs between two metal atoms is a metallic bond
An oxygen molecule is adsorbed on a patch of surface (see sketch at right). This patch is known to contain adsorption sites. The molecule has enough energy to move from site to site, so it could be on any one of them. Suppose part of the surface becomes inaccessible, so that only adsorption sites are now available for the molecule. Calculate the change in entropy. Round your answer to significant digits, and be sure it has the correct unit symbol.
This question is incomplete, the complete question is;
An oxygen (O₂) molecule is adsorbed on a patch of surface (see sketch at right). This patch is known to contain 324 adsorption sites.
The (O₂) molecule has enough energy to move from site to site, so it could be on any one of them.
Suppose part of the surface becomes inaccessible, so that only 400 adsorption sites are now available for the molecule.
Calculate the change in entropy.
Round your answer to 3 significant digits, and be sure it has the correct unit symbol.
Answer:
the change in entropy is 2.91 x 10⁻²³ J/K
Explanation:
Given the data in the question;
For an ideal gas,
Entropy of a molecule, S = K[tex]_B[/tex] ln(W)
where K[tex]_B[/tex] is Boltzmann constant (1.38065 x 10⁻²³ J/K)
W is Equivalent micro states of the molecule
( W[tex]_{initial}[/tex] = 324 and W[tex]_{final}[/tex] = 400 )
S[tex]_{final}[/tex] - S[tex]_{initial}[/tex] = K[tex]_B[/tex] ln(W[tex]_{final}[/tex]) - K[tex]_B[/tex] ln(W[tex]_{initial}[/tex] )
ΔS = K[tex]_B[/tex] ln(W[tex]_{final}[/tex] / W[tex]_{initial}[/tex] )
we substitute
ΔS = (1.38065 x 10⁻²³ J/K) × ln( 400 / 324 )
ΔS = 2.9093 x 10⁻²³ J/K
ΔS = 2.91 x 10⁻²³ J/K
Therefore, the change in entropy is 2.91 x 10⁻²³ J/K
The molecule with only single covalent bonds is _. (C) *
CO2
СО
CI2
ON2
Answer:
CO (carbon monoxide)
Explanation:
Which of the following is not a cause of water pollution?
A. Industrial waste
B. Agriculture
C. Raw sewage
D. Algae blooms
Answer:
A. Industrial waste
Explanation:
How does Barium obey the octet rule when reacting
to form compounds?
A. It gains electrons
B. It gives up electrons
C. It does not change its number of electrons
D. Oxygen does not obey the octet rule.
Answer:
it gives up electrons B. because the bond between the electrons is not very strong due to how few of them there are
Explanation:
I need help please....
Answer:
19. C 20. A 21. H 22. G 23. D 24. F 25. B 26. E
Explanation:
Just learnt it in science class
5.
Which is the best example of Newton's Second Law of Motion?
Answer:
ok so if I remember correctly then it basically its like if I have a baseball and throw it full force the the ball will go far because the mass is light and the force was great but if I get a bowling ball and do the same with equal force it will go shorter than the base ball because the mass if more than the force I put in
Describe the stages of water cycle
25. Classify the following as element, compound or mixture and explain how do you know?
a) NaCI + H2O
b) C2H4O
c) O2
d) Co
e) CO
f) H2 + O2
g) H2O2
Answer:
A Mixture
B compound
C element
D element
E. Compound
F mixture
G compound
Explanation:
A compound is formed from the chemical reaction between two or more atoms
A Mixture is formed when two or more elements are physically combined
An element is any substance that contains only one kind of an atom
i really kinda need some hell right now :)
how many molecules are in 6.31 moles of CO2
Answer:
Quantity of substance = (number of moles / number of molecules)
Explanation:
How much does carbon dioxide weigh?
Give me the answer to calculate for you
how many neurons does atom in the model shown below have
a.2
b.9
c.10
d.16
what is the kg of the net force is 30 N and the acceleration is 6 m/s 2
Answer:
5kg
Explanation:
Use the law: F=MA
F= force which is newton
M= mass which is kg
A= acceleration which is [tex]m/s^{2}[/tex]
Help please...........