This question is incomplete, the complete question is;
The rate constant for the reaction 3A equals 4B is 6.00 × 10⁻³ L.mol⁻¹min⁻¹.
how long will it take the concentration of A to drop from 0.75 to 0.25M ?
from the unit of the rate constant we know it is a second reaction order
OPTIONS
a) 2.2×10^−3 min
b) 5.5×10^−3 min
c) 180 min
d) 440 min
e) 5.0×10^2 min
Answer:
it will take 440 min for the concentration of A to drop from 0.75 to 0.25M
Option d) 440 min is the correct answer
Explanation:
Given that;
Rate constant K = 6.00 × 10⁻³ L.mol⁻¹min⁻¹
3A → 4B
given that it is a second reaction order;
k = 1/t [ 1/A - 1/A₀]
kt = [ 1/A - 1/A₀]
t = [ 1/A - 1/A₀] / k
K is the rate constant(6.00 × 10⁻³)
A₀ is initial concentration( 0.75 )
A is final concentration(0.25)
t is time required = ?
so we substitute our values into the equation
t = [ (1/0.25) - (1/0.75)] / (6.00 × 10⁻³)
t = 2.6666 / (6.00 × 10⁻³)
t = 444.34 ≈ 440 min {significant figures}
Therefore it will take 440 min for the concentration of A to drop from 0.75 to 0.25M
Option d) 440 min is the correct answer
Is this true or false? :D
Answer:
true i am pretty sure
Explanation:
the ans. is false (:) ok
In the process of eating, what kind of energy in food is transformed into heat energy by your body?
chemical energy
light energy
mechanical energy
Answer:The chemical energy
Explanation:because The chemical energy in the food you eat is changed into another kind of chemical energy that your body can use. Your body then uses that energy to give you the kinetic energy that you use in everything you do.
Answer:
c i think
Explanation:
Which of the following graphs correctly shows the relationship between potential energy and internuclear separation for two hydrogen atoms
Answer:
D
Explanation:
The potential energy curve of a system of atoms define the potential energy of the atoms with respect to the inter-nuclear separation. The minimum point of the curve represents the equilibrium bond length of the bond.
The energy of the system depends on the distance between the two interacting atoms.
Looking at the potential energy curve for hydrogen molecule in option D, we can assert that a chemical bond indeed exists between the two atoms of hydrogen and the minimum point of the curve is the equilibrium bond length of the bond.
A common relation between potential energy and internuclear distance when stated, is applicable to the ground states of diatomic and polyatomic molecules.
The graphs that correctly shows the relationship between potential energy and internuclear separation for two hydrogen atoms is option d.The potential energy of two separate hydrogen atoms often becomes lower as they approach each other, and the single electrons on each atom are shared to form a covalent bond.
The bond length is regarded as the internuclear distance where the lowest potential energy is gotten. The strong attraction of each shared electron often stabilizes the system.
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Describe how this instrument works.
Operation:
Answer:
It amplifies the picture of something far away.
Explanation:
Answer:
Light from the moon reflects from large mirror, bent by small mirror, focused at focal point, magnified by eyepeice.
Explanation:
What type of bonding would be expected in argon?
Answer:
Argon is a member of the noble gas family of elements. This means that it already has eight valence electrons in its outermost shell. Because of this, Ar rarely bonds with other atoms to form compounds
Explanation:
What are three examples of matter you can see where you are right now. Thanks for the help everyone!
Answer: So you are matter, the apple, water, a computer etc.
Explanation: matter is anything that takes up space
If an athlete weighs 159 lb and has 15.0% % body fat by weight, how many pounds of fat does the athlete's body contain?
Answer:
23.85
Explanation:
is over of percent over 100
[tex]\frac{x}{159}[/tex]x[tex]\frac{15}{100}[/tex]
15 x 159 = 2385
2385 ÷ 100 = 23.85
If an athlete weighs 159 lb and has 15.0% % body fat by weight, the athlete's body contains approximately 23.84 pounds of fat.
To calculate the number of pounds of fat in the athlete's body, we can use the following steps:
Convert the athlete's weight from pounds to kilograms:
159 lb × 0.4536 kg/lb = 72.1224 kg
Calculate the weight of the athlete's body fat:
72.1224 kg × 0.150 = 10.81836 kg
Convert the weight of body fat from kilograms to pounds:
10.81836 kg × 2.2046 lb/kg = 23.8447 lb
Therefore, the athlete's body contains approximately 23.84 pounds of fat.
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#SPJ 2
While hiking in the Everglades, Melissa finds the fossil of a clam in a rock. In which type of rock would you most likely find a fossil?
Please answer this :)
Answer:
Sedimentary
Explanation:
2. What are instrument strings made of now?
Answer: They are made of nylon, steel or sometimes gut.
Explanation:
Which of the following conditions would speed up the rate of decomposition? (Select
more than one answer)
a. Temperature at 50 degrees fahrenheit
b. Being buried
c. Overweight body
d. A body with illness
e. Temperature at 95 degrees fahrenheit
Answer:
E and B
Explanation:
the warmer the weather the faster it will decompose, this why is why sometimes bodies last longer frozen, or in cool temperatures.
that statement takes a out.
An illness shouldn't effect a decomposing body
Weight also shouldn't effect a decomposing body
Being buried can make bodies decompose fast because of all the bugs and other animals that will get down there and decompose it faster
Answer: B,E
please help me asap
the gravity of the sun keeps them in their orbits just as the moon orbits the earth because of the pull of Earth's gravity the earth orbits the sun because of the pull of the sun's gravity
which of these phrases best describes an ecosystem
Answer:
all the living organisms in a specific location 2. ...
Identify some biotic factors in the diagram.
Identify some biotic factors in the diagram.
Identify some biotic factors in the diagram.
Identify what this diagram represents? ...
Give one effect that an increase in the minnow population would have on the ecosystem.
Which property is NOT a physical property?
Melting Point
Color
Ability to Burn
Density
Answer:
im pretty sure color is the right one
Answer: Ability to Burn
Explanation: I TOOK THE TEST
An electron at rest is subjected to two simultaneous constant magnetic fields; one is in the ax direction and the other is in the ay direction. The electron will:__________
Answer:
never move
Explanation:
Just like an electric current, we can only see the effects of magnetism when an electron is subjected to two simultaneous constant magnetic fields.
An electron at rest that is subjected to a magnetic field will never move but only in an electric field. The electrons are subjected to an electric force collinear with the electric field but in the opposite direction (the charge is negative).The acceleration vector tends to be in the same direction as the force, opposite the electric field.
Consider the reaction between NaOH (aq) and H2SO4(aq). 1) Please write the balanced reaction equation.
2) What is the concentration of the sodium hydroxide solution if 25.0 mL of it required 15.8 mL of a 0.350 M sulfuric acid for complete reaction?3) What is the concentration of the sodium hydroxide solution if 25.0 mL of it required 15.8 mL of a 0.350 M sulfuric acid for complete reaction?
4) If 14.0 mL of a 1.250 M sodium hydroxide solution and 25.0 mL of a 1.10 M phosphoric acid were reacted, what is the theoretical mass, in g, of the water produced?
Answer:
Explanation:
2NaOH + H₂SO₄ = Na₂SO₄ + 2H₂O .
2 ) 15.8 mL of .35 M sulphuric acid will contain .35 x .0158 moles of sulphuric acid
= .00553 moles
1 mole of H₂SO₄ reacts with 2 moles of NaOH
.00553 moles of H₂SO₄ will react with 2 x .00553 moles of NaOH
= .01106 moles
.01106 moles were contained in 25 mL
so concentration of NaOH = .01106 / .025
= .4424 M .
4 )
3NaOH + H₃PO₄ = Na₃PO₄+ 3H₂O .
14 mL of 1.25 M NaOH will contain .014 x 1.25 moles = .0175 moles
25 mL of 1.1 M phosphoric acid = .025 x 1.1 moles = .0275 moles
.0275 moles of phosphoric acid will require triple moles of NaOH , but it is in short supply . So NaOH is limiting reactant .
water formed = .0175 moles .
= .0175 x 18 grams of water
= .315 grams .
How does the acid level of a lake affect how many fish live there?
The dependent and independent Variable?
Answer:
it affects by how many fishes it kills i think
Explanation:
A 25.0mL sample of an acetic acid solution is titrated with a 0.175M NaOH solution. The equivalence point is reached when 37.5mL of the base is added. The concentration of acetic acid in the sample was :_________.A) 0.263
B) 0.365
C) 0.175
D) 1.83×10−4
E) 0.119
Answer:
Explanation:
First of all, let's write the equation of the reaction.
CH₃COOH + NaOH ⇒ CH₃COONa + H₂O
The formula to be used here is CaVa/CbVb = na/nb
where Ca is the concentration of the acid (?)
Cb is the concentration of the base (0.175M)
Va is the volume of the acid (25 mL)
Vb is the volume of the base (37.5 mL)
na is the number of moles of acid (1)
nb is the number of moles of base (1)
Ca × 25/0.175 × 37.5 = 1/1
Ca = 0.175 × 37.5 × 1 /25 ×1
Ca = 0.263 M
The concentration of the acid in the sample was 0.263 M
1.3188g of antacid is weighed and mixed with 75.00 mL of excess 0.1746 M HCl. The excess wcid required 27.20 mL of 0.09767 M NaOH for back titration. Calculate the amount of CaCO3 in the tablet.
The amount of CaCO₃ in the tablet : 0.5219 g
Further explanationReaction
1. CaCO₃(in antacid) + 2HCl⇒ CaCl₂+H₂CO₃
2. Titration ⇒ HCl+NaOH⇒NaCl+H₂O
Reaction 2For titration :
M₁V₁.n₁=M₂V₂n₂(n=acid/base valence⇒NaOH/HCl=1)
mol HCl=mol NaOH = excess HCl
[tex]\tt 27.2\times 0.09767=2.657~mlmol[/tex]
Reaction 1mol HCl
[tex]\tt 75\times 0.1746=13.095~mlmol[/tex]
Moles of HCl used (reacted with CaCO₃) :
initial HCl - excess HCl =
[tex]\tt 13.095-2.657=10.438~mlmol=0.010438~mol[/tex]
From reaction 1 :
mol HCl : mol CaCO₃ = 2 : 1
[tex]\tt mol~CaCO_3=\dfrac{1}{2}\times 0.010438=0.005219[/tex]
mass of CaCO₃ :
[tex]\tt 0.005219\times 100~g/mol=0.5219~g[/tex]
HELP ME PLEASE!!!!!!!!
Which choice best explains how global winds are formed?
Answer:
what are the choices?
Explanation:
What kind of energy is required for photosynthesis to occur?
energy stored in chemical bonds
energy from nutrients in the ground
thermal energy
solar energyy
Answer:
Explanation:
Solar energy
Your answer is 100% Solar Energy,
Which type of weathering causes the mineral composition of rocks to change?
Chemical weathering
General weathering
Mechanical weathering
Permeable weathering
Answer: chemical weathering
Explanation: Chemical weathering is different from mechanical weathering because the rock changes, not just in size of pieces, but in composition. That is, one type of mineral changes into a different mineral. Chemical weathering works through chemical reactions that cause changes in the minerals.
Answer:
I am not very sure but I think it's chemical weathering
How does heredity explain how traits
are passed from one generation to the next?
Answer:
Heritable traits are known to be passed from one generation to the next via DNA, a molecule that encodes genetic information. ... Organisms inherit genetic material from their parents in the form of homologous chromosomes, containing a unique combination of DNA sequences that code for genes.
Explanation:
please helppppp!!!
The Periodic Table is arranged by _______ properties:metals (mostly to the ____ of table,) metalloids(along the _____, and nonmetals) ( mostly to the ____ of table) . It is also arranged by chemical properties, including reactivity. Elements in the same vertical group have the same number of _____ electrons, and elements in the same horizontal period have the same number of _____ shells.
Explanation:
physicalleftmiddlerightouter mostelectron shellsWhat is the orbital or electronic geometry of a molecule with 0 nonbonding electron pairs and 2 bonding electron pairs?
what star sign would you be if you were born on 1st January?
If two forces are heading in the same direction, we ______ them to calculate net force.
options:
add
or
subtract
Answer:
add
Explanation:
In nature element Carbon is found with different physical properties.Which allotrope of carbon is shown in the figure ? प्रकृति में कार्बन तत्व अनेक विभिन्न भौतिक गुणों के साथ विविध रूपों में पाया जाता है। चित्र में कार्बन के कौन से अपररूप की रचना दिखाई गई है ? *
Captionless Image
ਹੀਰਾ /Diamond/हीरा
ਬਕਮਿੰਸਟਰਫੁਲਰੀਨ /Buckminsterfullerene/बकमिंस्टरफुलेरीन
ਗ੍ਰੇਫਾਈਟ /Graphite /ग्रेफाइट
ਇਨ੍ਹਾਂ ਵਿੱਚੋਂ ਕੋਈ ਨਹੀਂ / None of the above/इनमें से कोई नहीं
Answer:
Graphite
Explanation:
The structure of diamond is similar to that shown, but has a middle layer that is offset from the others. The structure of Buckminsterfullerene is that of a soccer ball, 60 atoms arranged in a 32-faced figure.
The structure shown matches that of graphite.
Which of the following occurs in an ionic bond? *
O Oppositely charged ions attract.
OTwo atoms share two electrons.
Two atoms share more than two electrons.
Like-charged ions attract.
Answer:
Oppositely charged ions attract.
Explanation:
In an ionic bond oppositely charged ions attracts one another by electrostatic attraction.
To form ionic bonds, chemical species must lose or gain electrons. Most metals will lose their electrons due to electropositive nature. Non-metals gains the electrons. When a substance lose electrons, it becomes positively charged. A non-metal gaining electrons becomes negatively charged. The attraction between these two species forms the ionic bond.Why saturated fatty acid can't create kink?
Explanation:
because of double bond within chemical foundation.
Answer:
Saturated fatty acids exhibit a linear structure while unsaturated fatty acids bend, or kink, due to double bonds within the chemical foundation.
