Answer: its c
Explanation:
Who first proposed the concept of free energy?
a. Gibbs
b. Lavoisier
c. Dalton
d. Hess
Answer:
Hello There!!
Explanation:
The answer is=>a. Gibbs.
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[tex]\huge{\textbf{\textsf{{\color{navy}{An}}{\purple{sw}}{\pink{er}} {\color{pink}{:}}}}}[/tex]
a. Gibbs
ThanksPlease give me the answer please
Answer:
A. 30cm³
Explanation:
Based on the chemical reaction:
CaCO₃ + 2HCl → CaCl₂ + H₂O + CO₂
1 mol of calcium carbonate reacts with 2 moles of HCl to produce 1 mol of CO₂
To solve this question we must convert the mass of each reactant to moles. With the moles we can find limiting reactant and the moles of CO₂ produced. Using PV = nRT we can find the volume of the gas:
Moles CaCO₃ -Molar mass: 100.09g/mol-
1.00g * (1mol / 100.09g) = 9.991x10⁻³ moles
Moles HCl:
50cm³ = 0.0500dm³ * (0.05 mol / dm³) = 2.5x10⁻³ moles
For a complete reaction of 2.5x10⁻³ moles HCl there are necessaries:
2.5x10⁻³ moles HCl * (1mol CaCO₃ / 2mol HCl) = 1.25x10⁻³ moles CaCO₃. As there are 9.991x10⁻³ moles, HCl is limiting reactant.
The moles produced of CO₂ are:
2.5x10⁻³ moles HCl * (1mol CO₂ / 2mol HCl) = 1.25x10⁻³ moles CO₂
Using PV = nRT
Where P is pressure = 1atm assuming STP
V volume in L
n moles = 1.25x10⁻³ moles CO₂
R gas constant = 0.082atmL/molK
T = 273.15K at STP
V = nRT / P
1.25x10⁻³ moles * 0.082atmL/molK*273.15K / 1atm = V
0.028L = V
28cm³ = V
As 28cm³ ≈ 30cm³
Right option is:
A. 30cm³A 31.0 mL sample of 0.624M perchloric acid is titrated with a 0.258M sodium hydroxide solution.
What is the (H+) molarity after the addition of 15.0 mL of KOH?
Answer:
0.0922 M
Explanation:
The problem first states that the titration is made using NaOH, and later asks about the addition of KOH. I'm going to assume NaOH was used throughout the whole problem. The result does not change if it was KOH instead.
The reaction that takes place is:
HClO₄ + NaOH → NaClO₄ + H₂OFirst we calculate how many HClO₄ moles are there in the sample, using the given molarity and volume:
0.624 M * 13.0 mL = 8.11 mmol HClO₄Then we calculate how many NaOH moles were added:
0.258 M * 15.0 mL = 3.87 mmol NaOHNow we calculate how many HClO₄ remained after the reaction:
8.11 - 3.87 = 4.24 mmol HClO₄As HClO₄ is a strong acid, 4.24 mmol HClO₄ = 4.24 mmol H⁺
Finally we calculate the molarity of H⁺, using the calculated number of moles and final volume:
Final volume = 31.0 mL + 15.0 mL = 46.0 mL4.24 mmol / 46.0 mL = 0.0922 MAn unknown aqueous metal analysis yielded a detector response of 0.255. When 1.00 mL of a solution containing 100.0 ppm of the metal was mixed with 99.0 mL of the unknown, the detector signal increased to 0.502. Calculate the concentration of the metal in the unknown solution. Report your answer in ppm
Answer:
1.022ppm is the unknown concentration of the metal
Explanation:
Based on Lambert-Beer law, the increasing in signal of a detector is directly proportional to its concentration.
The unknown concentration (X) produces a signal of 0.255
99mL * X + 1mL * 100ppm / 100mL produces a signal of 0.502
0.99X + 1ppm produce 0.502, thus, X is:
0.255 * (0.99X + 1 / 0.502) =
X = 0.503X + 0.508
0.497X = 0.508
X =
1.022ppm is the unknown concentration of the metal
Which soil horizon contains the most organic matter?
A horizon
B horizon
C horizon
D horizon
Answer:
I- It says horizon so.....what....wth ._.
Explanation:
What is the benefit of adding sodium hydroxide and sulfuric acid?
Answer:
When sodium hydroxide react with sulphuric acid they form Sodium sulphate and water. The reactants is base and an acid, which leads to neutralization process and yields a salt .
Answered by The One and only #Queen
Explain using balanced chemical equations, the alkaline hydrolysis reaction of esters.
Answer:
The alkaline hydrolysis of ester is known as saponification. When ester is heated with aqueous NaOH, sodium salt of acid and alcohol are formed.
The process of saponification of an ester in an alkaline solution. Alcohol and sodium salt of acid are created when the bis heated with aqueous NaOH.
What is saponification ?Esters are converted into soap and alcohol through the process of saponification, which uses an aqueous alkali. Fatty acids, which are long-chain carboxylic acids, are the building blocks of soaps. Sodium stearate is a regular soap ingredient.
From the Latin sapo, which signifies soap, the reaction is known as a saponification. The term is derived from the fact that fats were once hydrolyzed into esters to produce soap.
Particularly in the food industry, saponification is significant because it makes it simpler to estimate the amount of free fatty acids present in a specific food product. The quantity of free fatty acid can be determined by measuring how much alkali was needed to neutralize the fat or oil.
Thus,the alkaline hydrolysis reaction of esters is called as saponification.
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Can someone help me please
Answer: The pH of the substance is 8.25. The solution is basic.
Explanation:
pH or pOH is the measure of acidity or alkalinity of a solution.
pH is calculated by taking negative logarithm of hydronium ion concentration. The acids have pH ranging from 1 to 6.9 , salts have pH of 7 and bases have pH ranging from 7.1 to 14.
[tex]pH=-\log [H_3O^+][/tex]
Putting in the values:
[tex]pH=-\log[5.6\times 10^{-9}][/tex]
[tex]pH=8.25[/tex]
Thus as pH is more than 7, the solution is basic.
The pH of the substance is 8.25. The solution is basic.
If the reaction is begun with an initial PH3 concentration of 0.95 M, what will be the concentration of PH3 after 30.50 s
Answer:
[tex][PH_3]=0.30M[/tex] but see detailed explanation, please.
Explanation:
Hello there!
In this case, unfortunately, we are not given the rate constant but we can set up a reaction according to the information available on the internet:
[tex]4PH_3\rightarrow P_4+6H_2[/tex]
Whose rate constant is 0.0375/s. In such a way, it is possible infer that this is first-order reaction whose integrated rate law is:
[tex][PH_3]=[PH_3]_0exp(-kt)[/tex]
Thus, given the initial concentration, rate constant and elapsed time, the final concentration of PH3 would be:
[tex][PH_3]=(0.95M)exp(-30.50s*0.0375/s)\\\\[/tex]
[tex][PH_3]=0.30M[/tex]
However, it is important to keep in mind this result may vary according to your actual question.
Regards!
How can radioisotopes help in promoting clean technology in the mitigation of the effect of climate change? What are the challenges in the application of this technology?
Forget about mitigating climate change. Our planet has been warming nicely for the last three hundred years or more, and is a lot more productive and comfortable to live on than it was back then. All we have to do is not stuff it up.
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Answer:
I think its 3.6 to the right
Explanation:
I apologize if im wrong
The melting of ice is considered a/an _______ because the ice absorbs heat from the surroundings.
Question 3 options:
A)
chemical reaction
B)
thermochemical process
C)
exothermic process
D)
endothermic process
Answer:
the correct answer is D
Explanation:
Basically, melting ice is an endothermic reaction because the ice absorbs (heat) energy, which causes a change to occur.
2C10H22 + 3102
20CO2 + 22H2O
What mass of O2 is needed to react completely with 7.5 grams of C10H22?
Answer:
2c11h21
Explanation:
Hydrochloric acid reacts with sodium hydroxide to produce sodium chloride and water. If 20.6 g of sodium hydroxide reacts with an excess of hydrochloric acid, how many grams of sodium chloride are produced? HCl + NaOH → NaCl + H2O
Answer:
30.1 g NaCl
Explanation:
Your first conversion is converting grams NaOH to moles of NaOH using its molar mass (39.997 g/mol). Then, use the mole ratio of 1 mol NaCl for every 1 mol NaOH to get to moles of NaCl. Then finally multiply by the molar mass of NaCl (58.44 g/mol) to get grams of NaCl.
20.6 g NaOH • (1 mol NaOH / 39.997 g NaOH) • (1 mol NaCl / 1 mol NaOH) • (58.44 g NaCl / 1 mol NaCl) = 30.1 g NaCl
atoms and ions are held together by..
A.) nuclear bonds
B.) Stick bonds
C.) physical bonds
D.) Chemical bonds
Answer:
chemical bonds
Explanation:
The atoms in chemical compounds are held together by attractive electrostatic interactions known as chemical bonds. Ionic compounds contain positively and negatively charged ions in a ratio that results in an overall charge of zero. The ions are held together in a regular spatial arrangement by electrostatic forces.
Write the chemical equation for the dissolution of NH4Cl in water including the
Heat term
Can somebody please help me please!!
A scientist has two substances that she is testing in her lab: a pink
substance and a green substance. At room temperature, both substances
are liquids. The scientist transferred the same amount of energy into both
substances. She finds only the pink substance changed phase. How is the
pink substance different from the green substance? The pink substance
has a...
1) weaker attraction between its molecules than the green substance. Its molecules now
move away from each other.
2) weaker attraction between its molecules than the green substance. Its molecules now
move in place.
3) stronger attraction between its molecules than the green substance. Its molecules
now move away from each other.
4) stronger attraction between its molecules than the green substance. Its molecules
move around each other.
Answer:
1
Explanation:
........................
Which of these objectives do you feel like you've accomplished so far?
In order to determine the objectives that you've accomplished, you should identify the steps required to test a hypothesis.
What is a scientific method?A scientific method refers to the various techniques and objectives that are adopted to observe, investigate, and study the natural world while giving explanations on the basis of the evidence, hypothesis, or factual information that are derived from a research work.
The steps of a scientific method.An effective and efficient way to accomplish your objectives during a research work include the following:
Make observations.Ask questions.Construct a hypothesis.Test the hypothesis with an investigation.Analyze the data.Explain the result.Communicate the result.In conclusion, you should identify the steps required to test a hypothesis in order to determine the objectives that you've accomplished.
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Many scientists think human cloning is possible, so why haven't we made human clones yet?
Question 5 options:
There is not enough medical supplies to clone a human
Human cloning is extremely controversial and many people believe it is unethical
Scientists have determined that stem cells would not be beneficial to human cloning
The human genome is too complex to clone
Answer:
GIVEN IT'S A MULTI CHOICE QUESTION:
1. False
2. True
3. False
4. True
IF ITS NOT
2
Explanation:
We haven't made human clones because human cloning is extremely controversial and many people believe it is unethical.
What is cloning?Cloning is a genetic technique that can be used to reproduce genetically identical organisms in a laboratory.
Human cloning refers to the generation of genetically identical humans in the laboratory.Human cloning can be considered unethical because a person has the right to have an identity, and the cloning technique faces this principle.In conclusion, we haven't made human clones because human cloning is extremely controversial and many people believe it is unethical.
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HELP ME PLSSSSSSSSSSSSAA
Answer:
If capital R is round, than the RR and Rr will mean round, and the two rr's are wrinkled. that means the answer to both is 50%
Explanation:
hope that helps
Environments have changed over millions of years. Which of these would be best for a scientist to study when investigating these environmental changes?
A. volcanic deposits
B. weather forecasts
C. fossil records
D. ocean currents (There is no science subject so ima put mathematics)
Answer:
c
Explanation:
fossil records
A substance has a percent composition of 17.55% Sodium, 39.70%
Chromium, and 42.75% Oxygen. What is the empirical formula of the
substance? *
Need help anyone plz :)
Cr2Na2O7
Sodium Dichromate
3 attempts left
Check my work
Enter your answer in the provided box.
A volume of 1.0 L of air at 37°C is expelled from the lungs into cold surroundings at 5.6°C.
What volume in L) does the expelled air occupy at this temperature. The pressure and the number of
gas particles do not change.
L
Answer:
If kept in Celsius: 0.15 L
If kept in Kelvin: 0.89 L = 0.90 L
Explanation:
This formula can be remembered by just remembering the ideal gas law formula, PV=nRT
P= pressure, V= volume, n= moles, R=constant, and T= temperature.
Let's take away what is constant, particles/moles, pressure, and R.
so what we have is P=T -> [tex]\frac{V}{T}[/tex] =x, we want to know how it changes though so we can say that [tex]\frac{V1}{T1} = \frac{V2}{T2}[/tex]. Where P1 and T1 are for the air in your lungs that you expel, the P2 and T2 is the air now in your surroundings after you exhale.
Let's plug it in and solve for V2.
[tex]\frac{1 L}{37 C} = \frac{V2}{5.6}[/tex]
[tex]\frac{(1 L x 5.6 C)}{37 C} =[/tex] V2
0.15 L = V2
Without using the value of So, predict the sign for
a) 2K(s) + F2(g) → 2KF(g)
b) NaClO3(s) → Na+(aq) + ClO3-(aq)
c) 2NO(g) + O2(g) → 2NO2(g)
d) H2S(g) + O2(g) → S8(s) + H2O(g)
Answer:
a) 2f
B)CIO3+na
c)2NO2(g)
d)HSO3(h)
Explanation:
The sign of entropy depends on the number of gaseous substance in the system. In the first reaction, the number of gaseous particles increase in the product hence, randomness increases and thereby entropy is positive.
What is entropy ?Entropy is a thermodynamic quantity which measures the randomness of the system. As the disorder in the system increases, the entropy increases and the entropy change is said to be positive in sign.
In the first reaction, in the product side, 2 moles of gaseous substance is formed, which increases the randomness, hence, entropy change is positive.
In the second reaction, the more ordered solid state is getting into less ordered aqueous state. Hence, S is positive.
For the third reaction, the number of moles of gas decreases from 3 to 2. Hence S is negative. For the last reaction, there is no change in number of moles or state of substance and no change in S.
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A company claims that its weight-loss product is the safest. Why might this
be a biased claim?
A. The company is trying to get you to buy its product.
B. The company has lots of scientific information about the product
C. The company is very successful.
D. The company has studied the product more than anyone.
8.8 Why do esters with higher molecular mass not have strong fragrances?
Answer:
Basically, fragrances reach other person through sense of smell. So, the strength of the fragrances depends a lot on its evaporation, which is strongly related to the boiling point. Esters with higher molecular weight do not have a strong fragrance because it has a higher boiling point.
PLEASE HELP ME ON THIS QUESTION
a 61601609060
in word
Are based on the intrinsic properties of the chemical
Answer:
In materials science, an intrinsic property is independent of how much of a material is present and is independent of the form of the material, e.g., one large piece or a collection of small particles. Intrinsic properties are dependent mainly on the fundamental chemical composition and structure of the material.
Explanation:
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