Answers
A scientist determined the bones from a mastodon , The bones were 9377 years old when they were first found.
Find the decay constant (λ) first by using
λ= 0.693÷t₁/₂
λ=0.693÷5750
λ= 1.205×10⁻⁴
Now,
N=N₀e⁻λt
Where, originally, N₀= Mass of radioactive element
N= mass of radioactive element after time t
Apply natural logarithm on both the sides
In N=N₀₋λt
Let N₀ be 100 then N will be 100-58.8
= 41.1
In (41.1)= In (100)₋(1.205×10⁻⁴t)
In [41.1÷100]= ₋1.205×10⁻⁴t
₋1.136= ₋1.205×10⁻⁴t
t= ₋1.13÷(₋1.205×10⁻⁴)
t= 9377 years
Radioactive : Radioactivity is the term used to describe how an atomic nucleus splits or decays. Radiation is emitted when a radioactive material decays. A few types of decay include spontaneous fission, beta decay, gamma decay, neutron emission, and alpha decay.
Bones: The majority of vertebrate animals contain bones, which are rigid organs and a part of their skeleton. The bones, which also produce red and white blood cells, store minerals, provide the body structure and support, and allow motion, protect the body's other organs.
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Related Questions
Which of the following statements correctly explains why bromination reactions are more selective than chlorination reactions.
a. bromine radical is less stable than chlorine radical, so it is more reactive and less choosy
b. bromine radical is more stable than chlorine radical, so it is more reactive and less choosy
c. bromine radical is more stable than chlorine radical, so it is less reactive and more choosy
d. bromine radical is less stable than chlorine radical, so it is less reactive and more choosy
e. relative radical stability is 3' radicals > 2" radicals> 1 radicals when bromine radicals snatch hydrogens from alkanes, but when chlorine radicals snatch hydrogens the resulting alkyl radical stability is 3 radicals < 2 radicals< 1' radicals
Answers
Answer: A bromine radical is more stable than chlorine radical, so it is less reactive and more choosy.
Explanation:
A chlorine atom being more electronegative in nature is able to attract a hydrogen atom more readily towards itself as compared to a bromine atom.
Since bromine is less electronegative in nature so bromine will be more selective as a hydrogen abstracting agent. As a result, bromine radical is more stable in nature than chlorine radical.
Thus, we can conclude that bromine radical is more stable than chlorine radical, so it is less reactive and more choosy.
Convert 6.13 mg per kg determine the correct dose in g for 175lb patient
Answers
The correct dose for a 175 lb patient would be approximately 0.48602 grams.
To convert 6.13 mg/kg to grams, we need to consider the weight of the patient and perform a unit conversion. Here's the step-by-step process:
1. Convert the weight of the patient from pounds to kilograms.
175 lb * (1 kg / 2.205 lb) = 79.37 kg (rounded to two decimal places)
2. Calculate the correct dose in grams by multiplying the patient's weight by the given dosage.
79.37 kg * 6.13 mg/kg = 486.02 mg
3. Convert the dose from milligrams (mg) to grams (g) by dividing by 1000.
486.02 mg / 1000 = 0.48602 g (rounded to five decimal places)
Therefore, the correct dose for a 175 lb patient would be approximately 0.48602 grams.
It's important to note that this calculation assumes the dosage is based on body weight and that the given dosage is appropriate for the patient's condition. Always consult a healthcare professional or follow the instructions of a medical prescription for accurate dosing information.
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What is the maximum number of grams of NO (30.01 g/mol) that can be formed from the reaciton of 15.9 g of NH3 (17.03 g/mol) with 25.9 g of O2 (32.00 g/mol)?
4 NH3(g) + 5 O2(g) → 4 NO(g) + 6 H2O(l)
Answers
Based on the mole ratio, the maximum number of grams of NO that can be produced is 19.4 g.
What is the maximum number of grams of NO that can be produced?The maximum number of grams of NO that can be produced is calculated from the equation of the reaction as follows:
Equation of the reaction: 4 NH₃ (g) + 5 O₂ (g) → 4 NO (g) + 6 H₂O(l)
Mole ratio of NH₃ and O₂₂is 4 : 5
moles of NH₃ = 15.9 / 17.03
moles of NH₃ = 0.9336 moles
moles of O₂ = 25.9 / 32
moles of NH₃ = 0.809 moles
the limiting reactant is O₂
Mass of NO produced = 0.809 * 4/5 * 30
Mass of NO produced = 19.4 g
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Isoniazid is used in the treatment of tuberculosis and multiple sclerosis. Identify each lone pair as either localized or delocalized. Justify your answer in each case.
Answers
Answer:
Please find the complete question and its solution in the attached file:
Explanation:
Using charles’ law: A sample of nitrogen occupies a volume of 250 mL at 25°C. What volume will it occupy at 95°C?
Answers
Answer:
\(308.70\text{ mL}\)Explanation:
Here, we want to calculate the final volume of the gas sample
From Charles' law, we know that volume and temperature are directly proportional at a pressure
Mathematically, we have that as:
\(\frac{V_1}{T_1}\text{ = }\frac{V_2}{T_2}\)From the question, we have the following values given:
V1 = 250 mL
V2 = ?
T1 = 25°C
We convert this to Kelvin by adding 273.15
That is 25 + 273.15 = 298.15 K
T2 = 95°C
We convert this to Kelvin by adding 273.15
That is 95 + 273.15 = 368.15 K
Substituting the values, we have it that:
\(\begin{gathered} \frac{250}{298.15}\text{ = }\frac{V_2}{368.15} \\ \\ V_2\text{ = }\frac{368.15\times250}{298.15} \\ \\ V_2\text{ = 308.70 mL} \end{gathered}\)importance of hematology
Answers
Answer:
Haematology is the specialty important for the diagnosis and management of a wide range of benign and malignant disorders of the red and white blood cells, platelets and the coagulation system in adults and children.
Alkenes undergo an addition reaction with borane in tetrahydrofuran (THF).
For the reaction below:
((image))
Draw the structure of the major organic product.
Use the wedge/hash bond tools to indicate stereochemistry.
Use wedge and hash bonds ONLY when needed to show reaction stereochemistry.
If the reaction produces a racemic mixture, just draw one stereoisomer.
Answers
Alkyne chemistry refers to the branch of chemistry that deals with triple bonds between carbon atoms. Due to the presence of pi-electrons that are not tightly bound, alkynes undergo addition reactions.
Alkynes have a triple bond, which makes it possible to add halogens, water, and other substances to them through an addition reaction. A series of steps are used to create addition goods. The development of addition products is caused by the stability of vinylic cations. Asymmetric alkynes must adhere to Markovnikov's rule in order to conduct addition reaction. Below are a few addition reactions of alkynes that are explained: Alkenes are created when alkynes react with dihydrogen in the presence of catalysts like Pt/Pd/Ni. Alkanes are created when the produced alkenes further react with dihydrogen.
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Imagine that you have a 7.00 L gas tank and a 3.00 L gas tank. You need to fill one tank with oxygen and the other with acetylene to use in conjunction with your welding torch. If you fill the larger tank with oxygen to a pressure of 115 atm , to what pressure should you fill the acetylene tank to ensure that you run out of each gas at the same time? Assume ideal behavior for all gases.
Answers
According to Boyle's law, the pressure in the acetylene tank is 268.33 atmospheres.
What is Boyle's law?Boyle's law is an experimental gas law which describes how the pressure of the gas decreases as the volume increases. It's statement can be stated as, the absolute pressure which is exerted by a given mass of an ideal gas is inversely proportional to its volume provided temperature and amount of gas remains unchanged.
Mathematically, it can be stated as,
P∝1/V or PV=K. The equation states that the product of of pressure and volume is constant for a given mass of gas and the equation holds true as long as temperature is maintained constant.
In the given problem , by substituting values in formula P₁V₁=P₂V₂, P₂=115×7/3=268.33 atmospheres.
Hence, the pressure in acetylene tank is 268.33 atmospheres.
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Middle school question pls answer, statistics
Answers
i believe its B
Explanation:
4. Which is NOT true for ionic compound?
A. usually have high melting and boiling point.
B. characterized by sharing of electrons
C. characterized by transfer of electrons loth Die Hotarw
W
D. forms network of ions.
Answers
(option B) Characterized by sharing of electrons is not true for ionic compounds.
What are ionic compounds?Ionic compounds are chemical compounds formed by the transfer of electrons between a metal and a non-metal. They are composed of positively charged ions (cations) and negatively charged ions (anions) that are held together by electrostatic attractions.
Ionic compounds are formed through the transfer of electrons from one atom to another, resulting in the formation of positively charged cations and negatively charged anions. These oppositely charged ions are held together by strong electrostatic forces of attraction, forming a crystalline lattice structure.
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What are slime Molds?
Answers
Answer:
Slime mold or slime mould is an informal name given to several kinds of unrelated eukaryotic organisms that can live freely as single cells, but can aggregate together to form multicellular reproductive structures. Slime molds were formerly classified as fungi but are no longer considered part of that kingdom.
Answer:
Molds to put slime in
Explanation:
A 120 mL solution of sea water had 2.7x1022 sodium ions. What is the concentration of sodium in mol/L?
Answers
To calculate the concentration of sodium ions in sea water in units of mol/L, we need to use Avogadro's number to convert the number of ions to moles, and then divide by the volume of the solution in liters.
Avogadro's number is the number of atoms or molecules in one mole of a substance, and it is approximately 6.022 x 10²³.
First, we need to calculate the number of moles of sodium ions in the solution:
Number of moles of Na+ = (2.7 x 10²²) / (6.022 x 10²³) = 0.0448 mol
Next, we need to calculate the concentration of sodium ions in the solution:
Concentration of Na+ = (0.0448 mol) / (0.120 L) = 0.373 mol/L
Therefore, the concentration of sodium ions in sea water is approximately 0.373 mol/L.
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Suppose a student repeats Experiment 1 using strontium instead of magnesium. The student adds 4.93 g of strontium to a crucible, heats the crucible and its contents for several minutes over a Bunsen burner, and records the final mass of the crucible and its contents.
Write the balanced chemical equation for this reaction. Include physical states.
balanced equation:
What mass of product is expected to form in this reaction? Assume all of the strontium reacts.
mass of product:
Answers
The balanced chemical equation for the reaction between strontium and oxygen can be written as follows: 2 Sr (s) + \(O_2\)(g) → 2 SrO (s).
In this equation, solid strontium (Sr) reacts with gaseous oxygen (\(O_2\)) to produce solid strontium oxide (SrO).
To determine the mass of product expected to form in this reaction, we need to consider the molar ratio between strontium and strontium oxide. From the balanced equation, we can see that 2 moles of strontium react to produce 2 moles of strontium oxide.
The molar mass of strontium (Sr) is 87.62 g/mol, and the molar mass of strontium oxide (SrO) is 119.62 g/mol. Since the molar ratio is 1:1 between strontium and strontium oxide, the mass of strontium oxide formed will be equal to the mass of strontium used.
In this case, the student added 4.93 g of strontium to the crucible. Therefore, the expected mass of strontium oxide formed will also be 4.93 g.
It's important to note that this calculation assumes that the reaction proceeds to completion, meaning that all of the strontium reacts with oxygen. In actual laboratory conditions, the yield of the reaction may be less than 100% due to factors such as incomplete reaction, side reactions, or product loss.
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Which is for which? Here is the image to my question. Please help god bless.
Answers
Answer:
1 - Gravitational.
2 - Normal
3 - Tension
4 - Frictional
5 - Centripetal
Explanation:
1. If you drop something, gravity pulls it down to the Earth, So falling towards the earth is gravity.
2. Pushing back on another object is normal, Newton's law: Every action has an equal and opposite reaction.
3. When two forces are pulled on opposite sides, the object must stretch which creates tension. Think of a rubber band. If it is pulled more than the object can stretch, it will tear. Tensile strength refers to how much pulling force an object can withstand before it tears.
4. When objects or molecules rub against other objects or molecules they create friction.
5. Last two options go together.
Select the statement that best describes how energy is passed from a herbivore to a carnivore. (2 points)
Group of answer choices
Energy from the food sources that both herbivores and carnivores eat is passed directly from them to plants.
Energy from the foods carnivores eat is passed directly to an herbivore.
When an herbivore eats meat, and a carnivore eats the herbivore, energy from the eaten meat is passed indirectly to the carnivore.
When an herbivore eats plants, and a carnivore eats the herbivore, energy from the eaten plants is passed indirectly to the carnivore.
Answers
answer:when an herbivore eats meat and a carnivore eats the herbivore energy from the eatin meat is passed indirectly to the carnivore.
Which of the following is the strongest intermolecular force? - hydrogen bonding
- dipole-dipole attractions
- dispersion forces
- covalent bonding
Answers
The strongest intermolecular force is hydrogen bonding.
Ionic bonds and covalent bonds are atomic bonds, meaning they are intramolecular. They are generally stable and relatively irreversible.
Hydrogen bonds, dipole-dipole interactions, and van der Waals forces (London dispersion forces) are some common examples of intermolecular forces. Intermolecular forces will never change the identity of the molecule and cannot be used to add atoms to a compound.
The strongest intermolecular force is hydrogen bonding, which is a particular subset of dipole-dipole interactions that occur when hydrogen is in close proximity to a highly electronegative element. The hydrogen takes on a partial positive charge and the electronegative atoms take on a partial negative charge.
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A small amount of chemical splashes in Frank’s eye. What should Frank do immediately?
Answers
Answer:
A small amount of chemical splashes in Frank's eye. What should happen next? Frank should go to the eyewash station while his lab partner tells the teacher what happened.
Explanation:
Brainlist
What are the coefficients when the following equations are balanced? sb o2 --> sb4o6 h2s cl2 --> s8 hcl
Answers
The balanced reaction with correct coefficients for the given chemical reaction is given as,
4Sb + 3O₂ → Sb₄O₆
H₂S + Cl₂ → S + 2HCl
Balanced chemical equations are defined as the equations that have the same number and type of each atom on both sides of the equation. The coefficients in a balanced equation must be in the simplest whole number ratio. In a balanced chemical equation mass is always conserved.
The equation Sb + O₂ → Sb₄O₆ is written after balancing as 4Sb + 3O₂ → Sb₄O₆. Therefore, its coefficients are 4 and 3.
The equation H₂S + Cl₂ → S + HCl is written after balancing as H₂S + Cl₂ → S + 2HCl. Therefore, its coefficient is 2.
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Explain two positive aspects of using methane recapture systems.
Answers
Answer:
Two positive aspects of using methane recapture systems are able to generate significant electricity. Another benefit is that the process of anaerobic digestion creates heat that can be used to warm buildings where animals are kept
Answer: The correct answer is;
Two positive aspects of using methane recapture systems include lowering the impact on greenhouse gasses and the production of energy. Methane is a very potent greenhouse gas that is contributing to global warming. As a result, the recapturing process reduces the methane impacts of global warming by reclaiming and reusing the gas for other purposes. Recaptured methane can be stored and used to generate electricity or used as fuel to power updated vehicles and other engines on the farm. The overall benefits from this combination are reducing impacts causing global warming and lower the cost of electricity or fuel on the farm.
Explanation: This answer has been confirmed correct.
What is the net ionic equation for the reaction between Na2SO4 and CaCl2?
A. 2Na+(aq) + 2Cl-(aq) 2NaCl(aq)
B. Na2SO4(aq) + CaCl2(aq) CaSO4(s) + 2NaCl(aq)
C. SO42-(aq) + Ca2+(aq) CaSO4(s)
D. 2Na+(aq) + SO42-(aq) + Ca2+(aq) + 2Cl-(aq) CaSO4(s) + 2Na+ + 2Cl-(aq)
Answers
The net ionic equation for the reaction between Na₂SO₄ and CaCl₂ is:
SO₄²¯(aq) + Ca²⁺(aq) —> CaSO₄(s)
(Option C)
Dissociation equationIn solution, Na₂SO₄ and CaCl₂ will dissociate as follow
Na₂SO₄(aq) —> 2Na⁺(aq) + SO₄²¯(aq)
CaCl₂(aq) —> Ca²⁺(aq) + 2Cl¯(aq)
How to write the net ionic equationNa₂SO₄(aq) + CaCl₂(aq) —>
2Na⁺(aq) + SO₄²¯(aq) + Ca²⁺(aq) + 2Cl¯(aq) —> CaSO₄(s) + 2Na⁺(aq) + 2Cl¯(aq)
Cancel out the spectator ions (i.e Na⁺ + Cl¯) to obtain the net ionic equation
SO₄²¯(aq) + Ca²⁺(aq) —> CaSO₄(s)
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an industry is found to be discharging 20ib per day of benzene into a river with a flow of 10billion gallon per day. what will be the resulting benzene concentration, if the benzene is uniformly mixed with river flow
Answers
Answer:
Explanation:
bullet A layer of benzene (n = 1.50)2.60cm deep floats on water (n = 1.33) that is 6.50 cm deep. What is the apparent distance from the upper benzene surface to the bottom of the water laver when it is viewed at normal incidence?
For an electron that interacts with visible light, which visible photon would give the most accurate (lowest error) measurement of momentum (or speed)?
blue
yellow
green
orange
violet
Answers
Answer:
violet
Explanation:
When an electron interacts with visible light, energy is transferred from the photon to the electron.
The most accurate (lowest error) measurement of momentum (or speed) of an electron is obtained using a photon of high energy and low wavelength.
Violet light which lies at the high energy end of spectrum is most suitable.
What does it mean when someone has done multiple trials? A. They have performed an experiment once and reported their findings. B. They have performed a scientific experiment more than once. C. They have performed an experiment that can only be performed once. D. They have designed an investigation to answer a question.
Answers
A. They have performed an experiment once and reported their findings.
Which of these is an example of a physical property?
A. Iron combines with oxygen to rust.
B. Potassium reacts in water to form a base.
C. Sodium metal is soft and malleable.
D. Sodium ignites when placed in water.
Answers
Option C. Sodium metal is soft and malleable is an example of a physical property.
What is a physical property?A physical property can be defined as any feature of a substance that can be really observed and also measured without changing its chemical composition such as for example, the color, density of a metal, boiling point, conductivity, etc.
Therefore, with this data, we can see that physical properties have a significant impact on the performance and use of a given chemical product and they are associated with intrinsic features of the chemical material that forms molecules.
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which objects would have a greater gravitational force between them, Objects A and B, or Objects B and C? PLEASE HELPPP
Answers
Answer:
hmm:
Explanation:
Unless I am crazy, there should be an image attached to this. But, you can use this formula:
\(F = G\frac{m_1m_2}{r^2}\) where F is the force, G is a constant, m1 and m2 are the masses of the objects, and r is the distance between the objects.
The store paid 4.50 for a book and sold it for $7.65.what is the profit as a percent of the cost to the store? A. 3. 15% b. 58.8% c. 70% d. 315%
Answers
Answer: This would be C.) 70%
Explanation:
For the reaction 2HNO3 + Mg(OH)2 → Mg(NO3) 2 + 2H2O, how many grams of magnesium nitrate are produced from 6 grams of nitric acid, HNO3 ?
Round your answer to the nearest tenth. Do not round your answers until the last step of the problem. If you do, the computer might mark your answer incorrect and you will be asked to complete your second trial for this assessment.
Use the following molar masses:
Element Molar Mass
Hydrogen 1
Magnesium 24
Nitrogen 14
Oxygen 16
Answers
To make 0.0793 grams of magnesium nitrate from 4 grams of nitric acid, 2HNO3 + Mg(OH)2 Mg(NO3) 2 + 2H2O.
What is the reputation of nitrate?Saltpeter (saltpetre), potash nitrate, and nitre are some of its more frequent names. The manufacturing of nitric acid, rocket motor propellants, and other fireworks all require it. It also functions as food preservation and fertilizer.
What level of nitrate is dangerous?Nitrate concentrations above 10 mg/L in drinking water might have an immediate negative impact on health. The procedures below should be taken if nitrate levels in your water are greater than 10 mg/L: Purchase bottled water or other safe alternative sources of drinking water.
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During certain times Jupiter is much closer to Mars than to the Sun. Why does Mars not fall into Jupiter’s orbit instead of the Sun’s?
Answers
Mars does not fall into Jupiter’s orbit instead of the Sun’s because of gravity that holds it in place.
Why does Mars not fall into Jupiter’s orbit instead of the Sun’s?Following the heliocentric model, the sun lies at the center of the solar system. This implies that all the planets are found to orbit the sun and the ellipses planets have the sun as the focus.
Thus, none of the planets could fall out of its orbit around the sun as they are all held in place by the force of gravity. As such, Mars does not fall into Jupiter’s orbit instead of the Sun’s.
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Atoms have _______ different subatomic particles.
A. 7
B. 5
C. 3
D. None of the above
Answers
Answer:
C. 3
Explanation:
I hope my answer will be useful
How many moles are in 3.46 g of chromium?
Answers
Answer:
0.06654345229738384 moles of chromium.