A. 0.038 g.
Explanation:
The decay of carbon-14 is a first order reaction.
The rate constant of the reaction (k) in a first order reaction = ln (2)/half-life = 0.693/(5730 year) = 1.21 x 10⁻⁴ year⁻¹.
The integration law of a first order reaction is:
kt = ln [Ao]/[A]
k is the rate constant = 1.21 x 10⁻⁴ year⁻¹.
t is the time = 17,190 years.
[Ao] is the initial concentration of carbon-14 = 0.300 g.
[A] is the remaining concentration of carbon-14 = ??? g.
∵ kt = ln [Ao]/[A]
∴ (1.21 x 10⁻⁴ year⁻¹)(17,190 years) = ln (0.300 g)/[A]
2.08 = ln (0.300 g)/[A]
Taking exponential for both sides:
8.0 = (0.300 g)/[A]
∴ [A] = 0.0375 g ≅ 0.038 g
pentanitrogen heptachloride formula
Answer:
Explanation:
this is the answer hope it helps!(:
The chemical formula of pentanitrogen heptachloride is N₅Cl₇ as it has 5 nitrogen atoms and 7 chlorine atoms.
What is chemical formula?
Chemical formula is a way of representing the number of atoms present in a compound or molecule.It is written with the help of symbols of elements. It also makes use of brackets and subscripts.
Subscripts are used to denote number of atoms of each element and brackets indicate presence of group of atoms. Chemical formula does not contain words. Chemical formula in the simplest form is called empirical formula.
It is not the same as structural formula and does not have any information regarding structure.It does not provide any information regarding structure of molecule as obtained in structural formula.
There are four types of chemical formula:
1)empirical formula
2) structural formula
3)condensed formula
4)molecular formula
Learn more about chemical formula,here:
https://brainly.com/question/29031056
#SPJ2
which best describes nuclear energy?
A the energy that matter has due to the vibrations of its particles
B the energy an object has due to its chemical bonds
C the energy generated by a flow of electrons
D the energy stored inside the center of an atom
Answer:
The correct answer is - D. the energy stored inside the center of an atom.
Explanation:
Each atom has a small center in it called the nucleus and the energy that holds the nucleus or center of the atom together in the atom is known as nuclear energy.
It is the energy that is stored in the center of the atom and normally does not come out, however, in some radioactive atoms the sends some part of the energy as radiation.
Thus, the correct answer is - D. the energy stored inside the center of an atom.
Which statement is true about percent yield
What is valence of helium
A 240g hydrated sodium sulphide contains 162g of water of crystallisation. What is the correct molecular formula for this compound?
What is the answer and working
Answer:
Explanation:
First of all, 1 mol of Sodium Sulphide has molecular mass of
S = 32
Na2 = 2*23 = 46
The formula of NaS is actually Na2S. It's molecular mass = 78
How many grams of Na2S are present
Grams present = 240 - 162 = 78 which is exactly 1 mol.
The remainder is water.
The molecular mass of water = 2 + 16 = 18
162 grams of water = 162/18 = 9 mols of water.
So the correct formula is Na2S*9H20
Câu 9: 100 g dung dịch MgCl2 9.5 % tác dụng đủ với dung dịch KOH 5,6 % .được dung dịch A và chất rắn B. Lọc rắn B và nung đến khối lượng không đổi được chất C.
a) Viết pt .Tính khối lượng răn C
b) Tính nồng độ phân trăm của dung dịch A.
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Isobutane (C4H10) is one of the components of natural gas. Which equation
shows the balanced combustion reaction for isobutane?
A. C4H10 + O2 + 4CO2 + H2O + heat
B. C4H10 + O2 + CO2 + H2O + heat
C. C4H10 + O2 + 4C02 + 5H20 + heat
D. C4H10 +6.502 → 4002 + 5H20 + heat
SUBMIT
Answer:
D. C₄H₁₀ + 6.5O₂ → 4CO₂ + 5H₂O + heat
Explanation:
The reaction of the combustion of isobutane with oxygen is presented as follows;
C₄H₁₀ + 6.5O₂ → 4CO₂ + 5H₂O + heat
In the above reaction, the number of elements on the reactant side are;
4 carbon, C, atoms, 10 hydrogen, H, atoms, and 13 oxygen, O, atoms
The number of elements on the product side of the above chemical reaction are;
The number of carbon atoms, C = 4
The number of hydrogen atoms, H = 10
The number of oxygen atoms, O = 13
Therefore, the number of atoms on the reactant side of the chemical equation are equal to the number of atoms on the product side, and the combustion reaction for isobutane is balanced.
How is kilo gram is related to gram
Answer:
i know you think that they are just related because kg has kilo but they are related because
Explanation:
1000g makes 1 g.You see how much there is a difference in the solution because how is one=one thousand,well that is all i can help you from here.bye panta
Answer:
1 g=1000kg
Explanation:
They are related in mathematical way
The process during which cells of the body harness energy from food consumed by a living organism is ______________________.
En una carrera de atletismo un deportista se muestra agotado sin fuerzas para continuar y decide abandonar la carrera ¿Que alimentos tomo antes de la carrera ?
Answer:
Los alimentos para evitar la fatiga durante una carrera son alimentos bajos en grasas y altos en carbohidratos, así como alimentos bajos en fibra como pan, mantequilla de maní, plátano, jugo de frutas sin pulpa, y beber hasta aproximadamente 600 ml de líquido aproximadamente 3 horas. antes de la carrera
La comida para comer unos días antes de la carrera incluye carnes magras, arroz, pasta y verduras con contenido de almidón.
Los alimentos que se deben evitar incluyen carne roja, alimentos con alto contenido de grasas saturadas, alimentos fritos, pasteles y salchichas.
Explanation:
relate the pH of a solution to its hydronium and hydroxyl ion concentration and its acidity or basicity
brain list if your answer is good
when ph decrease that means acidity increase
when ph increase that means basicity increase
What is Halo form reaction?
Answer:
Explanation:
I willl go into a bit of detail on the haloform reaction. So the first few steps involve forming an enolate using the base, typically NaOH. THe enolate and go on to do alpha halogenation 3 times. After that, is leaves a trisubstituted alpha methyl carbon with a specific halogen. This is a good leaving group in itself and can carbonyl nucleophillic substitution and turn into a carboxylic acid with a CHZ3- byproduct where Z represents a halogen.
By which process aqua fortis is manufactured
1) Haber's process
2) Ostwald process
3) Contact process
4) Deacon's process
Answer: Aqua fortis is also known as Nitric Acid
Explanation: and the process in making aqua fortis is THE OSTWALDS PROCESS
detailed explanation by me
ammonia is also used in this process, which is reacted with oxygen and water and a catalyst platinum.
HOPE THIS HELPSS!!!
Precipitate WILL form if Silver Nitrate reacts with Iron (III) chloride
-true or false
Answer:
yes
Explanation:
3Ag(No3) (aq) +FeCl3(aq) -->Fe(NO3)3(aq)+3AgCl(s)
I pls help me this is the question:
define the following terms below
Answer:
natural resources: materials or substances such as minerals, forests, water, and fertile land that occur in nature and can be used for economic gain.
renewable resources: a natural resource that is unlimited or that is naturally replenished rather quickly, such as sunlight or water
non renewable resources: (also called a finite resource) is a natural resource that cannot be readily replaced by natural means at a pace quick enough to keep up with consumption.
please answer fast............
It's O2 which is oxygen....
Answer:
c. CO2 is the answer.Explanation:
Hope this helps you. Please mark as brainliest. Good Luck^_^
Why are the highest oxidation state of the transition metal stabilised in the oxide and fluoride compond?
Answer:
Following are the solution to the given question:
Explanation:
Its maximum oxidation zone is exceptionally stable and has the greatest ability to charge density, while fluoride and oxide ions are the largest particles with the largest durability of charge.
Or it might be assumed as oxygen and fluorine are the system particle atoms that have the highest electron number of metals.
Chất tinh khiết là:
A. Có tính chất thay đổi
B. Có lẫn thêm vài chất khác
C. Gồm những phân tử đồng dạng
D. Không lẫn tạp chất
Answer:
The FitnessGram™ Pacer Test is a multistage aerobic capacity test that progressively gets more difficult as it continues. The 20 meter pacer test will begin in 30 seconds. Line up at the start. The running speed starts slowly, but gets faster each minute after you hear this signal. [beep] A single lap should be completed each time you hear this sound. [ding] Remember to run in a straight line, and run as long as possible. The second time you fail to complete a lap before the sound, your test is over.
fd
We have two surfaces A and B where same amount of Force is acting. Area of Surface A is greater than Area of Surface B. which of the following will be true *
1 point
Pressure on Surface A > Pressure on Surface B
Pressure on Surface B > Pressure on Surface A
Pressure does not depend on area
Pressure on Surface A= Pressure on Surface B
Answer:
Pressure on Surface A > Pressure on Surface B
Explanation:
Pressu
re on Surface B > Pressure on Surface A
How can you calculate the instantaneous rate of a reaction from a graph of concentrations over time?
What will happen if we drink liquid nitrogen?
difference Between phenol and dettol
ASAP
What happens to a glass of pure fruit juice when water is added to it?
A - The number of moles of fruit juice increases.
B - The number of moles of fruit juice decreases.
C - The molarity of the juice increases.
D - The molarity of the juice decreases.
D. The MOLARITY of the juice DECREASES when water is added to it.
MOLARITY refers to the amount of a substance (solute) in a certain volume of solution. It is a measure of the CONCENTRATION OF A SOLUTION. In chemistry, molarity is calculated by dividing the number of moles of a solute by the volume of the solvent i.e.
MOLARITY (mol/L or M) = number of moles (n)/volume of solvent (V)
* The above equation means that the molarity of a solution is inversely proportional to its volume i.e. as molarity increases, volume decreases and vice versa.
According to this question, water is added to a glass of pure fruit juice (dilution). This means that the volume of the juice will increase. As the volume increases via addition of water, the MOLARITY DECREASES.
Learn more: https://brainly.com/question/20899596
how is soda made?
this includes sprite, coca cola, dr pepper, exd.
Answer:
Soda all start with watered down corn syrup. To get the carbonation companies have different ways of doing this all of which are very different. The last step is to add artificial and natural flavors like lemon and lime, this is also the step in which sugar and preservatives are added.
Explanation:
I hope this answer your question, srry I couldn't go into detail.
An atom with 6 protons and 8 neutrons is an)
Answer: carbon (C)
Explanation:
A car of 1200 kg is moving with a speed of 36 Km/hr. It is stopped by applying brakes withion with in 5 seconds. Calculate the amount of force required to stop the car.
Answer:
–2400 N
Explanation:
This is a physics question. However, the answer to the question is given below.
We'll begin by converting 36 Km/hr to m/s. This can be obtained as follow:
3.6 Km/hr = 1 m/s
Therefore,
36 Km/hr = 36 Km/hr × 1 m/s / 3.6 km/hr
36 Km/hr = 10 m/s
Thus, 36 Km/hr is equivalent 10 m/s.
Next, we shall determine the acceleration of the car. This can be obtained as follow:
Initial velocity (u) = 10 m/s
Final velocity (v) = 0 m/s
Time (t) = 5 s
Acceleration (a) =?
a = (v – u) / t
a = (0 – 10) / 5
a = – 10 / 5
a = –2 m/s²
Finally, we shall determine the force required to stop the car. This can be obtained as follow:
Mass (m) = 1200 Kg
Acceleration (a) = –2 m/s²
Force (F) =?
F = ma
F = 1200 × –2
F = –2400 N
NOTE: The negative sign indicate that the force is in opposite direction to the motion of the car.
In Rutherford experiment some alpha particles fired at a gold foil bounced backward as a result of ... A.reflection from the surfaces of gold atoms B.electrostatic repulsion by gold nuclei C.electrostatic repulsion by electronsD.all of the aboveE.none of the above
Answer:
B.electrostatic repulsion by gold nuclei
Explanation:
According to Rutherford's experiment, a thin gold foil was bombarded with alpha particles. Some of the particles passed through the foil undeviated, some were scattered through large angles while some bounced backwards.
It follows that the particles that bounced backwards must have encountered a massive particle of like charge.
The atom is composed of a nucleus which contains positively charged particles. Some of the alpha particles which are positively charged particles bounced back when they encountered the positively charged particles in the nucleus.
Answer: The correct option is B (electrostatic repulsion by gold nuclei).
Explanation:
In the Rutherford's experiment, he used positively charged particles called alpha particles to bombard an atom in order to find out what is inside the atom. Together with two other scientists, Geiger and Marsden, they used a narrow beam of alpha particles emitted from a radioactive source to bombard a thin gold foil. The scattering of the particles from the gold foil was detected by a movable zinc sulphide screen which could be rotated to various positions around the foil.
Each time an alpha particle hit the screen, a visible flash of light or scintillation was produced. This was observed by a microscope attached to the screen. It was then observed that some of the particles followed a straight path through the gold foil while a few where scattered in a backward direction. This was as a result of electrostatic repulsion by gold nuclei which occurs due to the greater part of the mass of the atom was concentrated in a minute nucleus with positive charge.
A cylinder container with a diameter of 23.0 cm and a height of 140 cm contains N2O at a pressure of 108 kpa and temperature of 294 K. How many grams of N2O gas are in the cylinder?
Answer:
113.17 g
Explanation:
This can be solved using the Ideal Gas Equation:
PV=nRT
First step is to calculate the volume of the cylinder in L:
V=πr²h
V= π (11.5)² (140)
V= π (132.25) (140)
V = π (18.515)
V = 58,166.588 cm³ = 58.2 L
Then, convert kpa into atm:
1 kpa = 0.00987 atm
108 kpa = 1.06588 atm
Then, plug all of your values into the Ideal Gas Equation to solve for moles:
(1.06588)(58.2)=n(0.082057)(294)
62.034=n(24.125)
2.571357513=n
Finally, convert the moles into grams
2N = 28.0134 amu
O = 15.999 amu
_______________
44.0124 amu
(2.571357513moles)(44.0124 amu) = 113.17 g
Unknown # 29
Flame Test Color: Green
Addition of HCl(aq): Bubbles
Addition of HCl(aq) and BaCl2(aq): NR (No Reaction)
Addition of HNO3(aq) and AgNO3(aq): White precipitate
What is the unknown ionic compound molecular formula?
Answer:
I think it's a sulphate ion, because when you add hydrochloric acid to it it produces bubbles and when you add barium chloride it then produces a white precipitate.its formula is SO4
I hope this helps
Which of the following elements will most likely not form an ion at all?
Br
Na
O
Ar
Mg
Answer:
О
because it has the fewest number of electrons
