Answer:
12C and 16O
Explanation:
Here, we want to select which of the options are NMR inactive. For an isotope to be NMR inactive, then the net nuclear spin is zero.
What this means is that the number of proton present coupled with the number of neutrons are an even number pair.
What we are saying here is that the number of protons is an even number while the number of neutrons too is an even number. So the net nuclear spin in this case is zero.
in the case of oxygen, we have 8 protons and 8 neutrons. This makes the nuclear spin zero and consequently makes the isotope NMR inactive.
Same is in the case of carbon. There are 6 protons and 6 neutrons and this also makes nuclear spin zero .
In all the other isotopes in the question, we have odd number even number or even number odd number pairs of protons and neutrons.
what is the mass in grams of 1.9×1023 atoms of lead?
Answer:
Explanation:
# moles that exist in 1.9 X 10 23 =
= # of atoms/# of Avogadro 's num
= 1.9 X 10 23 / 6.02x10 23
= 0.266 mole of Pb
now we calculate the mass
mass of lead = # mol x m.wt
= 0.266 X 106.4
= 28.30 gram
Is matter smooth and continuous?
Answer:
YES,Explanation:
Matter is smooth and continuous. ... A liquid has a definite volume; but it has no definite shape.Explain how plastic can be both beneficial and detrimental at the same time.
Answer:
Detrimental- Toxic chemicals leach out of plastic and are found in the blood and tissue of nearly all of us. Exposure to them is linked to cancers, birth defects, impaired immunity, endocrine disruption and other ailments
Beneficial- Plastic packaging helps protect and preserve goods, while reducing weight in transportation,
The absolute temperature of a fixed mass of ideal gas is tripled while its volume remains constant. The ratio of the final pressure of the gas to its initial pressure is
Answer:
3 : 1
Explanation:
The following data were obtained from the question:
Initial temperature (T₁) = T
Initial pressure (P₁) = P
Final temperature (T₂) = 3T
Final pressure (P₂) =..?
Since the volume is constant, we shall use the following formula P₁ /T₁ = P₂ /T₂ to obtain the final pressure. This is illustrated below:
P₁ /T₁ = P₂ /T₂
P/T = P₂ /3T
Cross multiply
T × P₂ = P × 3T
Divide both side by T
P₂ = P × 3T /T
P₂ = P × 3
P₂ = 3P
Therefore, the final pressure is tripled.
Finally, we shall determine the ratio of the final pressure to the initial pressure as follow:
Initial pressure (P₁) = P
Final pressure (P₂) = 3P
Final pressure (P₂) : Initial pressure (P₁)
P₂ : P₁ => 3P/P
P₂ : P₁ => 3 : 1
Therefore, the ratio of the final pressure to the initial pressure is 3 : 1
The Urbana wastewater treatment plant discharge permit limits the discharge of ammonia/ammonium (NH3/NH4 ). To meet this permit, the ammonium is converted to nitrate (NO3 - ) by biological nitrification in trickling filter towers. The solution entering the nitrification towers contains 15 mg/L of NH4 as N. Write a balanced reaction for the oxidation of NH4 to nitrate,
Answer:
Explanation:
The conversion of ammonium ion into nitrate ion is a two step process which is written below .
2 NH₄⁺ + 3 O₂ = 2NO₂⁻ + 4 H⁺ + 2H₂O
2NO₂⁻ + O₂ = 2 NO₃⁻
This is a two step reaction . These steps are managed by different class of bacteria.
6.300x10-5 – 7.200x10-3
Answer:
-17
Explanation:
6300/1000×10-5-7200/1000×10-3
63000/1000-5-72000/1000-3
63-5-72-3
-17
the coefficient is -7.137 but i’m not sure what the exponent is, i’m sorry :/
Can you answer both questions please??
23
A solid is insoluble in water but dissolves in aqueous acid and in aqueous alkali without
evolution of a gas in either case. What could the solid be?
A
B.
с
D
copper(II) carbonate
copper(II) hydroxide
zinc carbonate
zinc hydroxide
Answer:
copper(II) carbonate
What is the final volume of argon gas if 2.5 L at 94.0 kPa is compressed to a pressure of 207 kPa
Answer:
1.1 L
Explanation:
Volume and pressure are inversly proportional to each other meaning as volume increase, pressure decreases or the other way around. Use the equation V1P1=V2P2. So, it'll be (2.5L)(94.0kpa)=(207kPa)(V2). Thereby it is (2.5*94.0)/207= V2 = 1.1L. Don't forget your sigfigs which will be to 2 sigs.
TAn adult with the flu has a temperature of 103.0 ∘F.
Express your answer as an integer.
A brain contains 1.10×10^10 neurons.
Express your answer as an integer.
The time for a nerve impulse to travel from the feet to the brain is 0.46 s.
Express your answer as an integer.
Answer:A integer is a whole number.
An adult with the flu has a temperature of 102°F
A brain contains neurons (moving the decimal point to the right side power of 10 increases........here decimal point is moved to two places to the right side so power of 10 decreases from 10 to 8)
The time for a nerve impulse to travel from the feet to the brain is s. (moving the decimal point to the right side power of 10 increases........here decimal point is moved to two places to the right side so power of 10 decreases from 0 to -2)
Explanation: i am sorry for being 2 year late :(
i hope this answer your question if this is wrong or correct please let me know
The first health care worker said, "Anatomy and Physiology makes the difference between me being a nurse and a ______ nurse?
Answer
The first health care worker said, "Anatomy and Physiology makes the difference between me being a nurse and a great nurse?
Explanation:
I got the correct answer
Enter the full electron configuration for S2�. What is the atomic symbol for the noble gas that also has this electron configuration?
Answer:
1. Electronic configuration of sulphide ion S²¯ (18) => 1s² 2s²2p⁶ 3s²3p⁶
2. Ar
Explanation:
1. S²¯ simply indicates that the sulphur atom (S) has gained two extra electrons.
Thus we shall write electron configuration of sulphur (S) and sulphide ion (S²¯) as follow:
The electronic configuration of S²¯
S (16) => 1s² 2s²2p⁶ 3s²3p⁴
S²¯ (18) => 1s² 2s²2p⁶ 3s²3p⁶
2. Determination of the noble gas element that has the same electronic configuration as S²¯.
This is illustrated below:
Sulphur (S) has 16 electrons while the sulphide ion (S²¯) has extra 2 electrons making it to have a total electron of 18. Observing the elements in the periodic table, only Argon has 18 electrons with electronic configuration as:
Ar (18) => 1s² 2s²2p⁶ 3s²3p⁶
Therefore, sulphide ion (S²¯) has the same electronic configuration as Argon (Ar).
Using the mmoles of (35)-2,2,-dibromo-3,4-dimethylpentane calculated earlier and the molecular weight of the product (962 g/mol). Predict the theoretical 1 0096 yield of the product in grams. Round to the hundredths place.
Answer:
The yield of the product in gram is [tex]\mathsf{{w_P}=0.26 \ gram}[/tex]
Explanation:
Given that:
the molecular mass weight of the product = 96.2 g/mol
the molecular mass of the reagent (3S)-2,2,-dibromo-3,4-dimethylpentane is 257.997 g
given that the millimoles of the reagent = 2,7 millimoles = [tex]2.7 \times 10^{-3} \ moles[/tex]
We know that:
Number of moles = mass/molar mass
Then:
[tex]2.7 \times 10^{-3} = \dfrac{ mass}{257.997}[/tex]
[tex]mass = 2.7 \times 10^{-3} \times 257.997[/tex]
mass = 0.697
Theoretical yield = (number of moles of the product/ number of moles of reactant) × 100
i.e
Theoretical yield = [tex]\dfrac{n_P}{n_R}\times 100\%[/tex]
where;
[tex]n_P = \dfrac{w_P}{m_P}[/tex] and [tex]n_R = \dfrac{w_R}{m_R}[/tex]
Theoretical yield = [tex]\dfrac{(\dfrac{w_P}{m_P})}{(\dfrac{w_R}{m_R})} \times 100\%[/tex]
Given that the theoretical yield = 100%
Then:
[tex]100\% =\dfrac{(\dfrac{w_P}{m_P})}{(\dfrac{w_R}{m_R})} \times 100\%[/tex]
[tex]\dfrac{w_P}{m_P}=\dfrac{w_R}{m_R}[/tex]
[tex]{w_P}=\dfrac{w_R \times m_P}{m_R}[/tex]
where,
[tex]w_P[/tex] = derived weight of the product
[tex]m_P =[/tex]the molecular mass of the derived product
[tex]m_R =[/tex] the molecular mass of the reagent
[tex]w_R[/tex] = weight in a gram of the reagent
[tex]{w_P}=\dfrac{w_R \times m_P}{m_R}[/tex]
[tex]{w_P}=\dfrac{0.697 \times 96.2}{257.997}[/tex]
[tex]\mathsf{{w_P}=0.26 \ gram}[/tex]
The uncertainty in the measurement 0.0035 mg is:_______ A) + 0.1 mg B) + 0.01 mg C) 0.001 mg D) + 0.0001 mg
Answer:
The correct option is (D).
Explanation:
Uncertainty means lack of certainty in any calculations. It is the quantification of doubts after the calculations are done.
In this problem, we need to find the uncertainty in the measurement 0.0035 mg. There are 4 numbers after decimal. It means uncertain digit 1/10000 is the smallest scale division.
Hence, the uncertainty in the measurement 0.0035 mg is +0.0001 mg
the study of Mixture
Answer:
Mixtures can be either homogeneous or heterogeneous. A mixture in which its constituents are distributed uniformly is called homogeneous mixture, such as salt in water. A mixture in which its constituents are not distributed uniformly is called heterogeneous mixture, such as sand in water.
Explanation:
What is the function of the magnet in NMR?
A) It limits the nuclear spin to certain allowed spin states.
B) It allows random orientation of nuclear magnetic moments.
C) It causes the nucleus to spin.
D) It holds the sample in place.
Answer:
A) It limits the nuclear spin to certain allowed spin states.
Explanation:
A nucleus with an odd atomic number or an odd mass number has a nuclear spin, which can be observed through NMR.
A proton is the simplest nucleus, and its odd atomic number of 1 implies that it has one spin. We can visualize a spinning proton as a positively charged rotating sphere. This movement of a charged particle is like an electric current in a wired loop. It generates a magnetic field called the magnetic moment. When a small magnetic bar is placed in the field of a larger magnet, it rotates to align itself with the field of the larger magnet, a lower energy arrangement than an orientation against the field. Quantum mechanics requires that the proton's magnetic moment is aligned with the external field or against the field. The lowest energy state with the proton aligned with the field is called the spin alpha state (α spin). The higher energy state with the proton aligned against the external magnetic field is called the beta spin state (β spin).
In the absence of an external magnetic field, the magnetic moments of the protons have random orientations. When an external magnetic field is applied, each proton in a sample it assumes β state or α state. Because the state of spin α is lower in energy, there are more α spins than β spins.
What is the best reason for the scientific community to accept a theory?
Answer:it’s a
Explanation:
Some uses of titration in chem...
and definition of dipole moment
Answer:
Titration is used to determine the concentration of unknown solutions.
A dipole moments is a measurement of the separation of two opposite electrical charges
What are the properties of baking powder, baking soda, corn starch, gelatin, and salt?
Answer:
heeeee pues hola no se chao
Answer:
B. salt
-
I know that you answered this question like a month ago, but im going to answer anyway for the people who is having a hard time answering this :D
what's evaporation according to kinetic particle theory?
Answer:
Evaporation is a change of phase from liquid to gas explained as follows : When particles in the liquid phase are heated, they gain kinetic energy and move faster and further apart.
two things we can learn from fossils.
Answer:
fossils come from way back they can be left from dinosaurs and other species
Explanation:
Answer:
Using fossils, you can learn about extinct animals and plants, that's one. Two, you can learn about evolutionary traits and the fact that evolution exists.
Explanation:
A solution contains 3.95 g of carbon disulfide (CS2, molar mass = 76.13 g/mol) and 2.43 g of acetone ((CH3)2CO, molar mass = 58.08 g/mol). The vapor pressure of pure carbon disulfide and acetone at 35 oC are 515 torr and 332 torr, respectively. Assuming ideal solution behavior, calculate the vapor pressure of each of the components and the total vapor pressure above the solution. The total vapor pressure above the solution at 35 oC was experimentally determined to be 645 torr. Is the solution ideal? If not, indicate whether the solution deviates from Raoult’s law in a positive or negative manner.
Answer:
Psol = 433 torr
The solution is not ideal and the solution deviates from Raoult's law in a positive manner
Explanation:
The vapout pressure of a solution can be obtained using Raoult's law:
Psol = P°A* XA + P°B*XB
Where Psol is vapour pressure of solution
P° is vapour pressure of pure substance
X is mole fraction
As we have vapour pressure of pure carbon disulfide and acetone we need to find mole fraction of each compound to solve the vapour pressure of the solution:
Moles carbon disulfide:
3.95g CS₂ * (1mol / 76.13g) = 0.05188 moles
Moles acetone:
2.43g acetone * (1mol / 58.08g) = 0.04184 moles
Mole fraction of CS₂:
0.05188 moles / (0.05188mol + 0.04184mol) =
0.5536
Mole fraction acetone:
1 = X(CS₂) + X(Acetone)
X(Acetone) = 1 - 0.5536 = 0.4464
Solving for vapour pressure of the solution:
Psol = 515torr*0.5536 + 332torr*0.4464
Psol = 433 torrAs the experimental vapor pressure was 645torr > 433 torr (Theoretical vapor pressure), the solution is not ideal and the solution deviates from Raoult's law in a positive manner
Which phrase best describes the outer planets?
rocky with few moons
gaseous with slow rotations
dense with few moons
gaseous with low density
Answer: D. Gaseous with low density
Explanation: Took the test :)
Answer:
gaseous with low density
Explanation:
Read this description of the life cycle of a mushroom. 1. A mushroom begins to grow underground as a single-celled "spore.” 2. The spore grows into multicellular structures called "hyphae.” 3. The hyphae absorb nutrition and detect when conditions are right to sprout a mushroom above ground. 4. The sprouted mushroom then forms new spores that can enter the ground and begin the life cycle again. Which sentence about this life cycle shows that mushrooms need energy and respond to stimuli? A: A mushroom begins to grow underground as a single-celled “spore.” B: The spore grows into multicellular structures called “hyphae.” C: The hyphae absorb nutrition and detect when conditions are right to sprout a mushroom above ground. D: The sprouted mushroom then forms new spores that can enter the ground and begin the life cycle again
Answer:
Explanation:
I would sayy....C The hyphae absorb nutrition and detect when conditions are right to sprout a mushroom above ground.
Um I hope I helped bro :P
(-W-) but where's da cOokIeS??..........................Lol jkkk
Answer:
D THE SPROUTEEDMUSHROOM
Explanation:
how do isotope of the same element differ?
Answer:
isotope of the same element differ
Explanation:
isotope is one of two or more forms of the same chemical element. Different isotopes of an element have the same number of protons in the nucleus, giving them the same atomic number.
help me please, i appreciate it
Answer:
Wind and Hydroelectricity can be considered forms of solar energy.
Explanation:
Wind power is a form of solar energy because winds are caused by the heating of the atmosphere by the sun, the rotation of the Earth, and the Earth's surface irregularities. For as long as the sun shines and the wind blows, the energy produced can be harnessed to send power across the grid.
Hydroelectricity is a form of solar energy because Hydropower relies on the water cycle.
The water cycle has three steps:
Solar energy heats water on the surface of rivers, lakes, and oceans, which causes the water to evaporate.
Water vapor condenses into clouds and falls as precipitation—rain and snow.
Precipitation collects in streams and rivers, which empty into oceans and lakes, where it evaporates and begins the cycle again.
The chemical 2,4-D causes liver decay in birds. True False
Answer:
no it cant
Explanation:
what is the difference between ecosystem services natural resources
Answer: Ecosystem services are the flows of benefits which people gain from natural ecosystems, and natural capital is the stock of natural ecosystems from which these benefits flow. So, a forest is a component of natural capital, while climate regulation or timber might be the ecosystem service it provides.
when the temperature of a sample of liquid increases , what else increases ?
Answer:
Its kinetic energy.
Explanation:
In a liquid, the molecules are so close together that there is very little empty space. A liquid also has a definite volume, because molecules in a liquid do not break away from the attractive forces. The molecules can, however, move past one another freely, and so a liquid can flow, can be poured, and assumes the shape of its container.
An increase in the temperature of a liquid causes an increase in the average speed of its molecules. As the temperature of a liquid increases, the molecules move faster thereby increasing the liquid's kinetic energy.
Oxidation state of N in n2(g)
Answer:
0
Explanation:
did research