Answer:
B
Explanation:
the digestive system
For a reaction: aA → Products, [A]o -4.3 M, and the first two half-lives are 56 and 28 minutes, respectively. Calculate k (without units). Show Work!
A. 7.7 x 10^-2
B. 4.2 x 10^-3
C. 3.8 x 10^-2
D. 8.3 x 10^-3
E. None of these
Answer:
C.[tex]3.8\times 10^{-2}[/tex]
Explanation:
We are given that
Initial concentration, [tex][A]_o=4.3 M[/tex]
First half life, [tex]t_{\frac{1}{2}}=56[/tex]minutes
Second half life, [tex]t'_{\frac{1}{2}}=28[/tex]minutes
We have to find K.
The given reaction is zero order reaction.
We know that for zero order reaction
[tex]t_{\frac{1}{2}}=\frac{[A]_o}{2k}[/tex]
Using the formula
[tex]56=\frac{4.3}{2k}[/tex]
[tex]k=\frac{4.3}{2\times 56}[/tex]
[tex]k=3.8\times 10^{-2}[/tex]
Hence, option C is correct.
Zero-order reactions are the reactions when a surface or a catalyst is required for the reaction to proceed and is saturated by the reactant chemicals. The result of the concentration versus the time plot will be a straight line in a zero-order reaction.
[tex]3.8 \times 10 ^{-2}[/tex] is the value of k.
How to calculate the value of k?Given,
Initial concentration [tex][A_{0}][/tex] = 4.3 MThe first half-life of the reactant [tex](t \dfrac{1}{2})[/tex] = 56 minutesThe second half-life of the reactant [tex](t \dfrac{1}{2})[/tex] = 28 minutesThe given reaction in the question is of zero-order and for that, we know that,
[tex]t \dfrac{1}{2} = \dfrac{[A_{0}] }{2\;\rm k}[/tex]
Substituting the values in the equation we get:
[tex]\begin{aligned}56 &= \dfrac{4.3 }{2\; \rm k}\\\\\rm k &= {4.3 }{2 \times 56}\\\\\rm k &= 3.8 \times 10^{ -2}\end{aligned}[/tex]
Therefore, option C is correct.
Learn more about the zero-order reaction here:
https://brainly.com/question/4638382
What do the coefficients in the following balanced chemical equation mean?
2H2 + O2 → 2H2O
Answer:
number of moles of the substance
Explanation:
If we burn 1 gr of ethyl alcohol (C2H5OH) this will translate into a release of about 50 W of thermal energy of the flame that raise the temperature of the hot and cold reservoirs of a Sterling engine at 55 °C and 95 °C respectively. If at steady state the engine turns at about 240 rpm, its gears are shaped as rings of radius ~2 cm and weigh 50 gr, how efficient (in %) is the transfer of energy via flame?
Answer:
0.116%
Explanation:
efficiency of sterling engine = 1 - ( 55 + 273 )k / ( 95 + 273 ) k
= 1 - ( 328 / 368 ) = 0.10869
Determine how efficient the transfer of energy via flame is
apply this relation ; energy of steady state / energy output ---- ( 1 )
where; energy output = efficiency of sterling engine * energy
= 0.10869 * 50 = 5.4345 J/sec
energy of steady state = 1/2 * I * w^2 ------ ( 2 )
I = moment of inertia of engine = 2 * 10^-5 kgm^2
back to equation 2 :
energy of steady state = 1/2 * ( 2 * 10^-5 ) * ( 240 * 2π / 60 )^2
= 630.88 * 10^-5 J /sec
Input values into equation 1
= [ (630.88 * 10^-5 ) / 5.4345 ] * 100
= 0.116%
Electron transition can be likened to moving up and down a ladder. Which of the following statements best describes how an electron transitions in an electron cloud?
A. An electron can only gain or lose energy to move between quantized energy levels.
B. An electron can only gain or lose charge in integers when ions are formed.
C. An electron can only change its mass in quantized amounts when it gains or loses energy.
D. An electron can only change into certain types of particles when it gains or loses charge.
Answer:
C. An electron can only change its mass in quantized amounts when it gains or loses energy.
Explanation:
The electron mostly acts in a wave form and shales the orbit and in other worlds the electron transition to lower energy change its wave shape and sinks less but it does not leap or bounce back anywhere.pitch is produced by what??
Answer:
Pitch, in the chemical-process industries, the black or dark brown residue obtained by distilling coal tar, wood tar, fats, fatty acids, or fatty oils.
Explanation:
hopes it helps you☺
is being sporty a personality trait
Answer:
A physical trait can be identified just by looking at a person. Blonde, tall, man, short, fair skinned, injured, brown eyed, athletic, muscular, handicapped. ... For everyone character trait, there is an OPPOSITE character trait
In the laboratory, concentrated hydrogen chloric acid reacted with aluminum. Hydrogen gas was collected over water at 25 degrees Celsius and had a volume of 355 cm33 at a total pressure of 750 mm Hg. The vapor pressure of water at 25 degrees Celsius is 24 mm Hg. Find the partial pressure of hydrogen gas.
Answer:
i dont no this one plz the question is hard
The graph shows the volume of a gaseous product formed during two trials of a reaction. A diferent concentration of reactant was used during each trial, whereas the other factors were kept constant. Trial 2 Amount of Product Trial 1 Time Which of the following statements explains which trial has a lower concentration of the reactant? O Trial 1, because the average rate of the reaction is lower. O Trial 1, because this reaction lasted for a longer duration than Trial 2. O Trial 2, because this reaction was initially fast and later slowed down. O Trial 2, because the volume of product formed per unit time was higher
Answer:
A). Trial 1, because the average rate of the reaction is lower.
Explanation:
The first sentence elaborates that 'trial 1 had a lower level of concentration of the reactant that eventually led the reaction's average rate to fall.'
A trial having a higher level of concentration of a specific reactant will cause the concentration's average rate to rise. As per the graph provided, trial 2's average reaction rate is higher which shows that its concentration is greater and more reactive. However, the opposite happens in trial 1 where the amount of reactant is lesser in the concentration that leads the concentration to possess a lower rate of reaction. Thus, option A is the correct answer.
which of the following is an example of an arrthenius acid
Answer:
The common examples of Arrhenius acid includes HCl (hydrochloric acid), H2SO4 (sulphuric acid), HNO3 (nitric acid), etc.Oct 21, 2020
Explanation:
El tipo de enlace se puede determinar mediante la diferencia de electronegatividades de los átomos que lo forman. Basado en eso, si se unen un átomo de Calcio y un átomo de Bromo, el enlace será del tipo:
Answer:
Cuando se unen un átomo de calcio y un átomo de bromo, forman bromuro de calcio que se compone de Ca2 + y 2Br-. El tipo de enlace que se forma es el enlace iónico.
What is the name of this compound
Answer:
horizontal
Explanation:
does anyone know the substance of an egg after it has been cooked?
Answer:
Denaturation is what happens when heat is applied to the eggs. ... The heat coming from your stove denatures the protein by disrupting some of its bonds that held the molecule into shape. In the case of hard-boiled eggs, the proteins clump together and solidify, causing the egg white and yolk to harden.
I HOPE THIS WILL HELP YOUHAVE A GREAT DAY :)
Which pair of substances would react the
fastest?
a. Copper sheet and concentrated
nitric acid.
b. Copper powder and dilute nitric acid
C. Copper powder and concentrated
nitric acid.
Answer:
C. It has the highest rate of reaction. Copper has the highest TSA/V and concentrated nitric acid has huggest num of solute
CORRECT ANSWER ONLY ND WILL GIVE BRAINLIEST✌
Calculate the mass of nitrogen dioxide gas that would occupy
the same volume as 10g of hydrogen gas at ē same pressure and temperature
(H= 1.0 N = 14.0 O= 16.0) GAS LAWS/MOLES
Answer:
150g
Explanation:
Assuming they are ideal gases at the same temperature and pressure, equal moles of gasses have equal volume. IN this case, if we have 10g of hydrogen gas, that is 5 moles of H2 gas. That means 5 moles og NO2 will occupy the same volume which is 5*(14.0 + 16.0*2) = 230 g
what is 2n2 formula?
Answer:The distribution of electrons in an atom is called as Electronic Configuration. Formula 2n2 helps in the determination of the maximum number of electrons present in an orbit, here n= orbit number.
Explanation:
Which of these hypotheses cannot be tested?
A. The percentage of salt in ocean water stays the same throughout the ocean.
O B. Doubling the amount of salt in a bread recipe will cause the dough to rise faster.
C. Cooks should use sea salt in recipes instead of regular table salt.
O D. Increasing the amount of salt in salt water will increase the boiling point.
Cooks should use sea salt in recipes instead of regular table salt.
write an equation for the reaction between nitrogen (ii) oxide and iron (ii) sulphide
Answer:
Let us write down the reaction equations for inorganic substances:
N2 + 3H2 = 2NH3 – redox reaction (ORR), ammonia was obtained;
4NH3 + 5O2 = 4NO + 6H2O – ОВР, nitrogen oxide was formed (2);
2NO + O2 = 2NO2 – ОВР, nitrogen oxide was released (4);
H2O + 2NO2 = HNO3 + HNO2 – OBP, nitric acid obtained;
2HNO3 + PbO = Pb (NO3) 2 + H2O – ion exchange, lead nitrate was formed;
2Pb (NO3) 2 = 2PbO + 4NO2 + O2 – OBP, oxygen was obtained.
The reaction products are of practical importance, for example, lead nitrate is the basis for obtaining pigments necessary for dyeing fabrics in the textile industry. These reactions show the connection of non-metals, hydrides, oxides, acids, salts.
Jonny Jonny.
Yes papa?
Eating Sugar?
What comes next?
(A) Yes Papa
(B) No Mama
(C) Yes Mama
(D) No Papa
Answer:
(B) No papa
arafgzhzhsjdjkskbdjzjsj
Answer:
(D) No Papa
Explanation:
is this even chemistry pffttt
What is the product of the following numbers? Use a scientific calculator to
find the answer.
5.56 x 104 x 2.43 x 106
Answer:
148943.0592
Explanation:
The chemical formula for carbonic acid, a compound used in carbonated drinks, is H2CO3. Assume that these symbols represent the three elements of this compound:
Which picture correctly represents carbonic acid?
A.
B.
C.
D.
Option A correctly represents the structure of carbonic acid.
What is the carbonic acid?Carbonic acid is a compound that is composed of three elements which are carbon, hydrogen and oxygen. This compound is important in the production of carbonated soft drinks that are usually sold in shops. There are three atoms of oxygen, two atoms of hydrogen and one atom of carbon in the compound.
Now, we can see in the question that red refers to atoms of oxygen, grey refers to atoms of hydrogen and ash refers to the atoms of carbon. We now want to know which diagram represents the structure of carbonic acid.
From the images, we can see that option A correctly represents the structure of carbonic acid.
Learn more about carbonic acid;https://brainly.com/question/28175742
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What functional group does the molecule below have?
*two leg spider looking molecule*
Answer:
ether
Explanation:
Ether, any of a class of organic compounds characterized by an oxygen atom bonded to two alkyl or aryl groups. I attached an image as well.
Answer:
D. Ether
Explanation:
Ethers look like R---O---R. Thus, this molecule has the ether functional group. :)
Which of the following changes in the state of a substance results in an increase in the entropy?
Gas to solid
Gas to liquid
Liquid to solid
Solid to liquid
Answer:
the correct answer is
D. solid to liquid
neutral radicals examples
Neutral radicals are always electropositive
some examples of neutral radicals are:-
Ca±±Mg±±Ba ±±Al±±NH4±Hope it is helpful to you
Hiii please help me for balancing chemical equations:
potassium iodide + chlorine ------> potassium chloride + iodine
Answer:
KI + Cl2 = KCl + I2
Explanation:
hope this helps!!!
Answer:
2KI +Cl₂ → 2KCl +I₂
Explanation:
Potassium ion: K+
Iodide ion: I-
Thus, potassium iodide is KI.
Chlorine exist as a diatomic molecule thus it is written as Cl₂.
Chloride ion: Cl-
Thus, potassium chloride is KCl.
Iodine also exist as a diatomic molecule, thus it is written as I₂.
Write an unbalanced equation:
KI +Cl₂ → KCl +I₂
Now balance by ensuring the number of atoms of each element on each side is the same.
LHS
K: 1 ×2= 2
I: 1 ×2= 2
Cl₂: 2
RHS:
K: 1 ×2= 2
I: 2
Cl: 1 ×2= 2
Thus, the balanced equation is:
2KI +Cl₂ → 2KCl +I₂
What happens if kinetic energy of a gas is lowered
Answer:
"If you lower the kinetic energy of a gas its temperature will decrease because temperature is a measure of the average kinetic energy of a substance."
Explanation:
If carbon was the most common element found in the moons and planets, what element is
missing that would make them similar to Earth?
Scoring Scheme: 3-3-2-1 Given the starting solution had a concentration of 1.25 M, how many moles of Co[H2O]6Cl2 were available in the amount of starting solution you used
Answer:
The solution has 0.00994 moles of Co[H2O]6Cl2
Explanation:
Complete question: Given the starting solution had a concentration of 1.25 M, how many moles of Co[H2O]6Cl2 were available in the amount of starting solution you used?
mL= 7.95
Step 1: Data given
Concentration of the starting solution = 1.25 M
Starting solution = Co[H2O]6Cl2
Step 2: Calculate molar mass of Co[H2O]6Cl2
Atomic mass of Co = 58.93 g/mol
Atomic mass of H = 1.01 g/mol
Atomic mass of O = 16.00 g/mol
atomic mass of Cl = 35.45 g/mol
Molar mass of Co[H2O]6Cl2 =
1*58.93 + 12*1.01 + 6*16.00 + 2*35.45 = 237.95 g/mol
Step 3: Calculate number of moles
C = n/v
⇒with C = the Concentration of the starting solution = 1.25 M
⇒with n= the number of moles = to be determined
⇒with v = the volume = 7.95 mL = 0.00795 L
n = C * V
n = 1.25 M * 0.00795 L
n = 0.00994 moles
The solution has 0.00994 moles of Co[H2O]6Cl2
!!!!!!URGENT!!!!!!
What do the coefficients in the following balanced chemical equation mean?
2H2 + O2 + 2H2O
A) 2 moles of hydrogen and 1 mole of oxygen in the reactants
B) 2 moles of oxygen and 1 mole of hydrogen in the reactants
C) 2 moles of oxygen and 1 mole of hydrogen in the products
D) 2 moles of hydrogen and 1 mole of oxygen in the products
Answer:
2moles of hydrogen and 1 mole of oxygen in the reactants
What is the percent yield of a reaction?
O A. The difference between measured and calculated amounts
OB.
The amount of produd obtained
amount possible
* 100
C. The amount of product actually obtained in a reaction
D. The amount of product that is possible from a reaction
Answer:
B. The amount of produd obtained/amount possible * 100
Explanation:
In chemistry, the yield of a chemical reaction is the quantity or amount of products obtained in that chemical reaction. It is calculated by using the following formula:
Percentage yield = Actual yield/theoretical yield × 100
- The actual yield is the amount of products got from a chemical reaction
- The theoretical yield is the amount of product got from using the balanced equation (stoichiometry).
write molecular formula
1)aurric cloride
2)aluminium hydroxide
3)potassium thiosulphate
4)magnesium bicarbonate
5)magnesium sulphate
6)sodium oxide
7)cuprous oxide
8)mercuric oxide
9)calcium nitrate
10)aluminium oxide
11)ferric chloride
12)ammoium oxide
13)silver chloride
14)hydrogen bromide
15)magnesium nitride
16)hydrogen peroxide
17)sodium sulphate
18)ammonium sulphate
19)ferrous sulphate
20)sodium carbonate
21)zinc carbonate
22)calcium silicate
23)zinc carbonate
24)potassium clorate
25)aluminium hydroxide
26)ammonium hydroxide
27)sodium silicate
Okay.
Here's your below answers.
1) AuCl3.
2) Al(OH)3.
3) K2S2O3.
4) Mg(HCO3)2.
5) MgSO4.
6) Na2O.
7) CuO.
8) HgO.
9) Ca(NO3)2.
10) Al2O3.
11) FeCl2.
12) (NH4)2O.
13) AgCl.
14) HBr.
15) Mg3N2.
16) H2O2.
17) Na2SO4.
18) (NH4)2SO4.
19) FeSO4.
20) Na2CO3.
21) ZnCO3.
22) CaSiO3.
23) ZnCO3.
24) KClO3.
25) Al(OH)3.
26) NH4OH.
27) Na2SiO3.
