Answer:
Typically the emperical formula
Explanation:
You can think of the meperical formuala as a simplified version of the molecular formula.
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If the percent yield for the following reaction is 65.0%, and 30.0 g of NO2 are consumed in the reaction, how many grams of nitric acid, HNO3(aq), are produced?
3 NO2(aq) + H2O(l) --> 2 HNO3 (aq) + NO (g)
Answer:
17.8 grams HNO₃
Explanation:
Given: 3NO₂(g) + 2H₂O(l) => 2HNO₃ + NO
30.0g/46g/mol 2/3(0.652mol)
= 0.652mol = 0.435mol (theoretical)
actual yield (65.0%) = 0.65(0.435mol) = 0.283mol(63g/mol) = 17.8 grams HNO₃
The disaccharide lactose can be decomposed into its constituent sugars galactose and glucose. This decomposition can be accomplished through acid-based hydrolysis or by the enzyme lactase. Lactose intolerance in humans is due to the lack of lactase production by cells in the small intestine. However, the stomach is an acidic environment; therefore, one might expect lactose hydrolysis to still be an efficient process. The following data were obtained on the rate of lactose decomposition as a function of acid and lactose concentration.
Initial Rate (M^-1 s^-1) [Lactose]o (M) [H+](M)
0.00116 0.01 0.001
0.00232 0.02 0.001
0.00464 0.01 0.004
Required:
Using this information, determine the rate law expression for the acid-based hydrolysis of lactose.
Answer:
Rate = 116m⁻¹s⁻¹[lactose][H]⁺
Explanation:
the formula for rate of reaction is given as
Rate = k[lactose]∧α[H]⁺∧β
we solve for the value of α and β
([lactose]₁/[lactose]₂)∧α
α = [tex]\frac{ln\frac{0.00116}{0.00232} }{ln\frac{0.01}{0.02} }[/tex]
when we divide this equation
α = [tex]\frac{ln0.5}{ln0.5}[/tex]
α = 1
we find β
R₁/R₂ = 0.01/0.02(0.001/0.001)∧β
0.00116/0.00232 = 0.5(1)∧β
β = 1
Rate = k[lactose]∧α[H]⁺∧β
we have to find the value for k
k = 0.00116/0.01(0.001)
k = 0.00116/0.00001
= 116m⁻¹s⁻¹
Rate = 116m⁻¹s⁻¹[lactose][H]⁺
3x + 4y - 3z) - (2x - 6y + 7z)
x + 10y - 10z
x + 10y - 10z
x -10y - 10z
Answer: x + 10y - 10z is the answer
Explanation:
Why do materials interact to light differently?
Answer:
Refracted (refraction) – the bending of transmitted light as it travels across the boundary of one material into another material in which it's speed is different. Unlike diffraction, this change in direction of light occurs because light is changing its speed in the different substances in it traveling in.
Explanation:
Hope it helps
3. Methyl acetate is hydrolyzed at 25 oC in acidic environment. Aliquots of equal volume are removed and titrated with NaOH solution. The hydrolysis reaction is irreversible. The results are Time/s 339 1242 2745 4546 infinite Volume of base/ mL 26.34 27.80 29.70 31.81 39.81 Write the reaction of hydrolysis of methyl acetate. (3 pts.) Neglect the reverse reaction. Find the order of the hydrolysis reaction and the value of the rate constant at this temperature. (12 pts.) Total 15 pts.
Solution :
Time (sec) Volume of NaOH (mL)
339 26.23
1242 27.80
2745 29.70
4546 3.81
[tex]$\infty$[/tex] 39.81
Now the example of the first order kinetics w.r.t volumetric analysis is :
[tex]$k=\frac{2.303}{t} \log \left(\frac{v_{\infty}-v_0}{v_{\infty}- v_t}\right)$[/tex]
Here, [tex]$v_{\infty}= \text{ volume at }\infty = 39.81$[/tex]
[tex]$v_{t}= \text{ volume at time 't' } = 27.80$[/tex]
[tex]$v_0$[/tex] = volume at time 0 = 0
Since the interval is not constant, we take the time interval as
[tex]$=\frac{903+1503+1801}{3}$[/tex]
[tex]$=\frac{4207}{3}$[/tex]
= 1402.3333
≈ 1402 seconds
[tex]$k=\frac{2.303}{1402} \log \left(\frac{39.81-0}{39.81-27.80}\right)$[/tex]
[tex]$=(0.001643) \log \left(\frac{39.81}{10.01}\right)$[/tex]
= 0.001643 x 0.52045
= 0.00082
[tex]$= 8.55 \times 10^{-4} \ sec^{-1}$[/tex]
Therefore, the first order rate constant is k [tex]$= 8.55 \times 10^{-4} \ sec^{-1}$[/tex].
Which gas will have the least collisions between its particles?
A. Helium at 20 C
B. Oxygen at -45 C
C. Carbon dioxide at 80 C
D. Argon at 265 K
The gas that has the least collisions between its particle is helium at 20° C. The correct option is A.
What is collision?Collision is a term used when two particles or object collides or clash and there is an exchange or transformation of energy between them. When a collision happens, the force is exerted on each other.
Helium is the second most abundant element present in the atmosphere. It is the lightest gas and its particle collides when there is an increase in the temperature.
Thus, the correct option is A. Helium at 20° C., regarding the collision of particles between its particles.
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Why does a person need food?
Answer:
because their body needs to have something in order to function.
Explanation:
How is science based on observation used as evidence? How can this evidence be used?
15 POINTS AND BRAINLIEST
Answer:
w
Explanation:
A two metal alloy is 85% iron by mass. How many grams of manganese are found in a 36 gram sample of the alloy?
Answer:
5.4g
Explanation:
Metal Alloy = Iron + Manganese
Composition of Iron = 85%
Mass of Alloy = 36 g
Mass of Iron = 85/100 * 36 = 30.6g
Mass of Manganese = Mass of Metal Alloy - Mass of Iron
Mass of Manganese = 36g - 30.6 g = 5.4g
What is the first step in this
experiment?
Answer: Cut the card borad
Explanation:
The equilibrium constant, Kc, is calculated using molar concentrations. For gaseous reactions another form of the equilibrium constant, Kp, is calculated from partial pressures instead of concentrations. These two equilibrium constants are related by the equation Kp=Kc(RT)Δn where R=0.08206 L⋅atm/(K⋅mol), T is the absolute temperature, and Δn is the change in the number of moles of gas (sum moles products - sum moles reactants). For example, consider the reaction N2(g)+3H2(g)⇌2NH3(g) for which Δn=2−(1+3)=−2. Part A For the reaction 2A(g)+3B(g)⇌C(g) Kc = 63.2 at a temperature of 81 ∘C . Calculate the value of Kp. Express your answer numerically.
Answer:
Kp = 1.41 x 10⁻⁶
Explanation:
We have the chemical equation:
2 A(g) + 3 B(g)⇌ C(g)
In which A and B are the reactants and C is the product. We calculate first the change in the number of moles of gas (Δn or dn):
dn= (sum moles products - sum moles reactants)
= (moles C - (moles A + moles B))
= (1 - (2+3))
= 1 - 5
= -4
We have also the following data:
Kc = 63.2
T= 81∘C + 273 = 354 K
R = 0.082 L.atm/K.mol (it is a constant)
Thus, we introduce the data in the mathematical expression for the relation between Kp and Kc:
[tex]Kc = (RT)^{dn}[/tex]= (0.082 L.atm/K.mol x 354 K)⁻⁴ = 1.41 x 10⁻⁶
species evolve at different rates. for example, bacteria are unlikely to become extinct because they adapt more quickly than mammals to environmental changes. which pf the following best explains this difference
A: Bacteria reproduce more rapidly, allowing species to evolve more quickly
B:Bacterial populations are more isolated, permitting increases in genetic variability
C:certain bacteria grow more steadily over time, giving an evolutionary advantage over mammals
D: Individual bacteria have the same genes, providing opportunities for increased biodiversity in one population.
Answer:A
Explanation:
Species evolve at different rates. for example, bacteria are unlikely to become extinct because they adapt more quickly than mammals to environmental changes. Bacteria reproduce more rapidly, allowing species to evolve more quickly best explains this difference. Therefore, option A is correct.
What allows bacteria to evolve so quickly ?Bacterial species evolve quickly because of their large populations, which provide numerous opportunities for mutations, and because they readily exchange genetic information, even between species. Some of this genetic diversity influences drug sensitivity or resistance, providing material for Darwinian selection.
Bacteria are among the world's fastest reproducing organisms, doubling every 4 to 20 minutes. Some pathogenic strains of E. coli grow quickly.
Bacterial populations evolve antibiotic resistance so quickly due to their fast generation times, large population sizes, and unique gene acquisition methods. These are some of the reasons bacteria have been so successful in evolution.
Thus, option A is correct.
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HELP PLEASE!! (100 points)
Describe what happens to particles of matter as you cool the matter to absolute zero
(OK). In your description, be sure to explain the changes in kinetic energy and
particle motion
Answer:
As you cool a matter to absolute zero, their kinetic energy reduces significantly and the molecules slows down and begins to aggregate together. ... As heat is added, the molecules gain more kinetic energy. This shown in their increase motion. When heat is withdrawn, the particles slows down hope this helped
What physical property is characteristic of all of the elements in the group located in the rightmost column of the periodic table?
The physical property that is characteristic of all of the elements in the group located in the rightmost column of the periodic table is the gaseous state at room temperature.
What are Physical properties?Physical properties may be defined as those properties of matter that do not involves any chemical manifestation or appearance within the element. These properties are measurable and state the alteration between momentary states. Some examples of physical properties are as follows:
Physical appearance or color.Hardness of elementDensity.Melting and boiling points.Electrical conductivity.The groups located in the rightmost column of the periodic table are known as the halogens and the noble gases. These elements are typically gaseous in phase at room temperature. Apart from this, halogens also have high electronegativities because these elements have seven electrons in their valence electrons.
Therefore, the gaseous state at room temperature is the physical property that is characteristic of all of the elements in the group located in the rightmost column of the periodic table.
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Which of these items is made up of one or more molecules?
Gold
Hydrogen
Salt
Neon
The item that is significantly made up of one or more molecules is hydrogen. Thus, the correct option for this question is B.
What is a Molecule?A molecule may be defined as a group of one or more atoms that are held together by numerous chemical bonds. It is the smallest particle of a substance that has all sorts of physical and chemical properties of that substance.
Among the given options, gold and neon are the elements, while salt is a compound. Hydrogen is a gas of diatomic molecules bearing the formula H2. It is colorless, tasteless, odorless, non-toxic, and highly combustible. Hydrogen in its molecular form is more common.
A hydrogen molecule is one of the simplest possible molecules which significantly consists of two protons and two electrons. These protons and electrons are remarkably held together by electrostatic forces.
Therefore, the item that is significantly made up of one or more molecules is hydrogen. Thus, the correct option for this question is B.
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A chemical reaction takes place inside a flask submerged in a water bath. The water bath contains 3.30kg of water at 23.8°C. During the reaction 112.kJ of heat flows out of the bath and into the flask. Calculate the new temperature of the water bath. You can assume the specific heat capacity of water under these conditions is 4.18·J·g−1K−1. Round your answer to 3 significant digits. °C
Answer:
[tex]T_2= 31.9\°C[/tex]
Explanation:
Hello there!
In this case, it is possible to propose an energy balance in order to illustrate how the heat released by the reaction is absorbed by the water:
[tex]-Q_{rxn}=Q_{water}[/tex]
Thus, since the heat released by the reaction is -112 kJ (-112000 J), it is possible to define the hear absorbed by the water in terms of mass, specific heat and temperature change:
[tex]-(-112000J)=m_{water}C_{water}(T_2-T_1)[/tex]
In such a way, it is possible to define the final temperature as shown below:
[tex]T_2=23.8\°C+\frac{112000J}{3300g*4.18\frac{J}{g\°C} }\\\\T_2= 31.9\°C[/tex]
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Diffusion is the movement of water between the cell membrane.
O True
O False
it is true good friend chip chip cherrio
Pleaseeeee guysssss
Explain Which enthalpy diagram shows that the reaction above is an exothermic reaction that produces -550 kJ of heat? Why? The
Answer:
no answer of this question
What happens because of nuclear fusion?
A. Earth experiences cold temperatures neede to sustain life.
B. Plants are unable to produce their own food.
C. Animals receive too much heat and begin to die out.
D Earth is provided with heat and light energy needed to sustain life.
Answer:
d
Explanation:
State three acids, bases, and Salts commonly used in therapeutic processes
Bobota
Level 1
Q2
What is the ability of a substance to
burn or ignite, causing fire or combustion?
DANGER
A. Chemical stability
B Reactivity
C Flammability
D. Conductivity
Answer:
chemical stability
Explanation:
g goodnight
Trixie Bell is a yearling goat. She consumes 0.75 lb of grain and 4.25 lbs of hay daily.
14% of the grain is digestible protein, but only 2.5% of the hay is digestible protein.
How many grams of protein does Trixie Bell consume daily?
Answer:
95.91 g
Explanation:
First we convert the given masses of grain and hay into grams:
0.75 lb of grain * 454 g/lb = 340.5 g of grain4.25 lb of hay * 454 g/lb = 1929.5 g of hayNow we calculate how many grams of protein Trixie consumes from grain:
340.5 g of grain * 14/100 = 47.67 g proteinAnd do the same for hay:
1929.5 g of hay * 2.5/100 = 48.24 g proteinFinally we add the protein grams:
47.67 + 48.24 = 95.91 gPlease help me thanks:)
Answer:
where it goes
Explanation:
Answer:
I didn't do the observation that the question said so I can't help sorry
Which describes the proper way to use an eye wash station?
Keep your contact lenses in place.
Press on your eyelids firmly.
Rinse your eyes for fifteen minutes.
Call the paramedics for instructions.
Answer:
C
Explanation:
Rinsing your eyes thoroughly is the proper way to was your eyes out.
1. Take your contacts out as they can get stuck in your eye.
2. Don’t press on your eyes as you will just rub in the chemical substance more.
3. Can’t call the paramedics as you should rinse your eyes immediately.
How does black and coloured objects absorb light and convert it into heat?
Answer:
Light energy can be converted into heat energy. A black object absorbs all wavelengths of light and converts them into heat, so the object gets warm. A white object reflects all wavelengths of light, so the light is not converted into heat and the temperature of the object does not increase noticeably.
When a solid turns into a liquid what is happening to the relationship between the forces?
Which of the following does not contain ionic bonds?
Sulfur dioxide
Aluminum oxide
Sodium oxide
Answer:
Sulfur dioxide
Explanation:
Sulfur dioxide does not contain ionic bonds.
Ionic bonds are formed by transfer of electrons while covalent bonds are formed by sharing of electrons.
Ionic bonds are also called electrovalent bonds. They are formed by transfer of electrons from one specie to another.
On the other hand covalent bonds are formed by sharing electrons. Covalent bonds are usually formed between two nonmetals while ionic bonds are usually formed between a metal and a nonmetal.
Sodium oxide is ionic because it is formed from sodium and oxygen (metal and nonmetal). The same applies to aluminium oxide.
The only compound formed from two nonmetals is Sulfur dioxide. It contains covalent bonds.
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You have a container which has the capacity to hold 3 L water. If it already has 2.25 L water in it, how much more water in mL can you still add to fill it completely?
Question 5
1 pts
What is the correct interpretation of an 85% yield for a given reaction?
85% of the anticipated amount of products were produced (relative to the theoretical yield)
O 15% of the reactants were used up
O 85% of the reactants were used up
15% of the anticipated amount of products were produced (relative to the theoretical yield)
Question 6
1 pts
True or false: The limiting reactant is the reactant that is used up after the reaction is complete.
O True
False
Answer: a) 85% of the reactants were used up
b) True
Explanation:
Percentage yield is defined as the ratio of actual yield to theoretical yield in terms of percentage. The actual yield is the amount of product obtained after the experiment and the theoretical yield is the amount of ideal product that should have been obtained.
Formula :
[tex]\text {percentage Yield}=\frac{\text {Actual Yield}}{\text {Theoretical Yield}}\times 100[/tex]
Thus 85 % yield means 85 % of the reactants were used up to give only 85% of products.
The limiting reactant is the reactant that limits the amount of product formed and hence is completely used up after the reaction is complete. Thus the given statement is True.
The solubility product for Zn(OH)2 is 3.0×10−16. The formation constant for the hydroxo complex, Zn(OH)2−4, is 4.6×1017. What is the minimum concentration of OH− required to dissolve 1.7×10−2 mol of Zn(OH)2 in a liter of solution?
Answer:
[tex][OH^-]= 1.12 \times 10^{-2} \ M[/tex]
Explanation:
[tex]\text{From the information given:}[/tex]
[tex]K_{sp} \ of \ Zn(OH)_2 \ is \ 3.0 \times 10^{-16}[/tex]
[tex]K_f \ of \ Zn(OH)_2 = 4.6 \times 10^{17}[/tex]
[tex]\mathtt{K_{sp} \ \ \ \ \ \ \ \ \mathtt{Zn(OH)_{2(s)}} \to Zn^{2+}_{(aq)} + 2OH^{-}_{(aq)} }[/tex]
[tex]\mathtt{K_{f} \ \ \ \ \ \ \ \ \mathtt{Zn^{2+}_{(aq)} } + 4OH^-_{(aq)} \to Zn(OH)^{2-}_{4}_{(aq)}}[/tex]
[tex]\mathtt{K \ \ \ \ \ \ \ \ \mathtt{{Zn(OH)_{2}_{(s)}}} + 2OH^{-}_{(aq)} \to Zn(OH)^{2-} _{4(aq) }}[/tex]
[tex]\text{To calculate the minimum concentration of OH}^{-}[/tex]
[tex]K = \dfrac{Zn(OH)^-_4}{[OH^-]^2} \\ \\[/tex]
[tex][OH^-]^2= \dfrac {0.017}{1.380 \times 10^2}[/tex]
[tex][OH^-]^2=1.232 \times 10^{-4}[/tex]
[tex][OH^-]= 1.12 \times 10^{-2} \ M[/tex]
The minimum concentration of OH- required to dissolve [tex]1.7\times10^-2\; mol[/tex] [tex]Zn(OH)_2[/tex] in a liter of solution is [tex]1.12 \times 10^-^2 \; M[/tex].
What is concentration?Concentration refers to the accumulation of a substance in a specific place.
The solubility equilibrium
[tex]ksp\;of\; Zn(OH)_2 = 3.0 \times 10^-^1^6\\kf \;of\; Zn(OH)_2 = 4.6 \times10^1^7[/tex]
Calculating the minimum concentration
[tex]k =\dfrac{Zn(OH)^-^4}{[OH^-]^2} \\\\[/tex]
[tex][OH^-]^2 = \dfrac{0.017}{1.380 \times 10^2} \\\\[OH^-]^2 = 1.232 \times 10^-^4\\[OH^-]^2 = 1.12 \times 10^-^2[/tex]
Thus, the minimum concentration of OH- required is [tex]1.12 \times 10^-^2 \; M[/tex]
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