How+long+will+it+take+for+20+%%+of+the+c-14c-14+atoms+in+a+sample+of+c-14c-14+to+decay?
Answers
It will take 5730 years.
What is C-14 atoms ?The radioactive isotope of carbon with the symbol 14C, often known as radiocarbon, has an atomic nucleus made up of 6 protons and 8 neutrons. The radiocarbon dating technique, developed by Willard Libby and colleagues in 1949 to date archaeological, geological, and hydrogeological samples, is based on its presence in organic molecules.
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Related Questions
Calculate the grams of calcium present in 70 grams of calcium chloride.
Answers
Answer:
37.1g of Ca
Explanation:
Hello,
Molecular formula for calcium chloride = CaCl
Molar mass = 40 + 35.5 = 75.5g/mol
Assuming there's one mole of CaCl
1 mole = mass / molar mass
Mass = 1 × 75.5
Mass = 75.5g
75.5g of CaCl contains 40g of Calcium
70g of CaCl will contain x g of Calcium
X = (70 × 40) / 75.5
X = 37.086g
Therefore, 70g of CaCl contains approximately 37.1g of Ca
write down which factors are most important when deciding on a particular feul for the purpose given
Answers
The factors collectively helps in making an informed decision when selecting a fuel for a particular purpose, taking into account the specific requirements and priorities of the application at hand.
When deciding on a particular fuel for a specific purpose, several factors come into play. The following are some of the most important considerations:
Energy Efficiency: The fuel's energy content and its efficiency in converting that energy into useful work or heat are crucial. Higher energy efficiency means better utilization of the fuel.
Environmental Impact: The environmental consequences of the fuel's production, combustion, and emissions are vital. Clean and low-carbon fuels help reduce air pollution and greenhouse gas emissions.
Availability and Accessibility: The fuel's availability, accessibility, and distribution infrastructure are essential for practicality and cost-effectiveness. Widely available and easily accessible fuels are preferred.
Cost and Affordability: The cost of the fuel and its affordability for consumers or businesses is a significant factor. Competitive pricing and stable costs make a fuel economically viable.
Safety: Safety considerations, such as flammability, volatility, and storage requirements, play a crucial role. Fuels that are stable, non-explosive, and have manageable safety risks are preferred.
Compatibility: The compatibility of the fuel with existing infrastructure, equipment, and engines is important. Easy integration without significant modifications or investments is desirable.
Long-term Sustainability: Assessing the long-term availability and sustainability of the fuel source is vital. Renewable and alternative fuels that reduce dependence on finite resources are favored.
Policy and Regulatory Environment: The support and incentives provided by policies and regulations impact fuel choices. Favorable regulations and incentives can encourage the adoption of certain fuels.
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What is the steric number of H2O2?
Answers
Answer: 1(2)+6(2)=14
Explanation:
Not sure, but maybe.
What compounds would you use for a ceramic baking dish
Answers
You are pushing a box with 20 N of force that has
a mass of 10 kg, solve for acceleration
Answers
Answer:
Force=mass ×acceleration.
20=10×acceleration.
20=10a.
a=2m/s^2.
If a 1.0x10-5 L sample of agas at 2.0x106 atm isreleased until it is equal to0.275 atm, what would thenew volume of the gas be?
Answers
Answer:
Explanation:
Here, we want to get the new volume of the gas
What we need to know is the law that connects volume and pressure at constant temperature
The law that supports this is the Boyle's law
It states that the volume of a given mass of gas is inversely proportional to its pressure at constant temperature
Mathematically, we can have this as represented as:
\(\begin{gathered} P_1V_1=P_2V_2 \\ P_1\text{ = 2.0 }\times10^{6\text{ }}\text{ atm} \\ V_1\text{ = 1.0 }\times10^{-5}\text{ L} \\ P_2\text{ =0.275 atm} \\ V_2\text{ = ?} \end{gathered}\)We can proceed mathematically to solve as follows;
\(undefined\)PLEASE HELP
Which concept accounts for the whole-number subscripts in chemical formulas?
A. law of multiple proportions
B. Avogadro's law
C. conservation of energy
D. conservation of matter
Answers
Answer:
Law of multiple proportions
Explanation:
What are 1A, 3B, and 7A examples of on the periodic table?
groups.
numbers
periods
O rows
Answers
Answer: Groups
Explanation:
I took the quiz
the state that is reached when ions are entering solution at the same rate at which they leave solution to regenerate a solid
Answers
The state that is reached when ions are entering solution at the same rate at which they leave solution to regenerate a solid is called solubility equilibrium.
Equilibrium is the state in a chemical system where the forward and reverse reactions occur at equal rates, resulting in no net change in the concentrations of reactants and products. In the context of ions entering and leaving a solution, this refers to a dynamic balance between the dissolution of a solid and the precipitation of the same solid.
When ions are introduced into a solution, they have the potential to dissolve and form hydrated ions, increasing the concentration of the ions in the solution. However, at the same time, the hydrated ions can also combine and precipitate as a solid, reducing the concentration of the ions in the solution. When the rate of dissolution and precipitation becomes equal, the system reaches a state of equilibrium, where the concentration of the ions remains constant over time.
In this equilibrium state, the solution and the solid are in a dynamic balance, with ions continuously entering and leaving the solution, but the overall concentration of the ions remains constant. This concept is fundamental in understanding chemical reactions and the behavior of solutions.
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explain why chlorine does not react with aqueous sodium fluorine
Answers
Answer:
because the two are opposite compounds.
Explanation:
When Chlorine is passed through aqueous sodium fluorine then no reaction takes place between these two because of reactivity order of Fluorine and Chlorine
What is displacement reaction ?Displacement reaction is a reaction in which one atom replaces other atom from a molecule on the basis of reactivity strength.
The reason for such reactivity is that as we go down the group the number of shells increases so outermost shell is very far away from the nucleus. If any atom from outside coming to this nucleus then this nucleus is unable to attract the electron of that that atom. Reactivity of halogens is directly proportional to the electronegativity power of that element, that is power to attract electron. Reactivity of halogens decreases down the group.
So Chlorine is less reactive than Fluorine so Chlorine can not replace Fluorine from sodium fluoride. Hence no reaction will take place.
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In a 63.17 g sample of SO3, how many grams are sulfur?
Answers
Answer:
25.30 gram
Explanation:
No of moles = given mass / molar mass
No of moles = 63.17/80.06
0.7890 moles
Mass of sulphar = no of moles× molar mass of sulphar
Mass of sulphur = 0.7890×32.065
25.30 gram
The amount of sulfur in 63.17 g sample of SO3 would be 25.25 g
MolesThe mole of any substance is given by: mass/molar mass
mole of 63.17 g SO3 = 63.17/80.06
= 0.79 moles
Stoichiometrically: SO3 ---> S + 3O
Mole ratio of SO3 to S = 1:1
Thus, equivalent mole of S = 0.79 moles
Mass of 0.79 moles S = 0.79 x 32
= 25.25 g
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what is the rate constant of a first-order reaction that takes 555 secondsseconds for the reactant concentration to drop to half of its initial value?
Answers
The rate constant of a first-order reaction that takes 555 seconds for the reactant concentration to drop to half of its initial value is 1.2 x 10^-3 sec^-1.
A first-order reaction refers to a chemical reaction in which the rate of reaction is proportional to the concentration of the reactant. In other words, doubling the reactant concentration doubles the reaction rate. The time taken that is taken for original population of radioactive atoms to decay to half of initial value is called the half-life. The half-life of a first-order reaction is a constant that is related to the rate constant (k) for the reaction given by: t1/2 = 0.693/k. Radioactive decay reactions are first-order reactions.
According to the provided information, t1/2 = 555 seconds
Hence,
555 = 0.693/k
k = 0.693/555 = 0.0012486 = 1.2 x 10^-3 sec^-1
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How did Louis Pasteur’s experiments lead to new scientific understandings of germs? A.Experiments with cooking food showed that disease-carrying germs in food could be killed when heated. B.Experiments with different magnification lenses showed that germs were real and could be observed. C.Experiments with animals showed that dominant genes could lead to risks of disease. D.Experiments with shallow dishes showed that groups of germs could be grown so they could be seen without microscopes.
Answers
Answer:
A.Experiments with cooking food showed that disease-carrying germs in food could be killed when heated.
Explanation:
Louis Pasteur (1822-1895) is regarded as the father of immunology. He extensively studied microbes and their effect on food. He discovered that microorganisms were responsible for the spoilage of food.
His most important discovery was the fact that heating wine to 55°C will lead to the death of microorganisms and prevented wine from spoiling and did not affect its taste. This process is known as pasteurization.
Answer:
A
Explanation:
In the chemical compound FePO4, what is the percent composition of iron? Type your answer in the space below, rounded to the nearest whole number.
Answers
The percent composition of iron in the chemical compound FePO4 is 23%. Molar mass of O = 16 g/mol(4 atoms of O)Total = 56 + (31 × 1) + (16 × 4) = 150 g/molThe molar mass of iron (Fe) is 56 g/mol.
To calculate the percent composition of iron in the chemical compound FePO4, we need to find the molar mass of the whole compound and that of iron and then divide the two. The molar mass of FePO4 is:Molar mass of Fe = 56 g/molMolar mass of P = 31 g/molMolar mass of O = 16 g/mol(4 atoms of O)Total = 56 + (31 × 1) + (16 × 4) = 150 g/molThe molar mass of iron (Fe) is 56 g/mol.
Percent composition of iron in FePO4 = (Molar mass of Fe / Molar mass of FePO4) × 100= (56/150) × 100= 37.33%≈ 23% (rounded to the nearest whole number)Therefore, the percent composition of iron in the chemical compound FePO4 is 23%.
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List all the possible types of bonding for oxygen
Answers
Two covalent bonds are formed by oxygen to complete their octet.
What are covalent bonds?An electron exchange that results in the formation of electron pairs between atoms is known as a covalent bond. Bonding pairs or sharing pairs are the names given to these electron pairs. Covalent bonding is the stable equilibrium of the attractive and repulsive forces between atoms when they share electrons.
What is an octet?In chemistry, an octet is an arrangement of eight electrons in the outer electron shell of a noble gas atom. The relative inertness of noble gases and the chemical behaviour of several other elements are attributed to this structure.
What is oxygen?The chemical element oxygen has an atomic number of 8. (it has eight protons in its nucleus). At normal temperatures and pressures, oxygen transforms into the chemical compound (O2) of two atoms, which is a colourless gas.
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Which choice describes climate? In March 1971, Canada was hit by a major blizzard and up to 32 inches of snow fell. The U.S. gulf coast was hit by Hurricane Katrina in 2005 and suffered extensive damage. The U.S. gulf coast typically has warm, wet weather and tropical storms during the summer and fall. An extremely dangerous tornado hit Jarrell, Texas in 1997 destroying 40 homes.
Answers
Answer:
Its C
Explanation:
If you look, you can see that it tells you the humidity and the that its warm but it also tells you that it storms a little to and that makes it easier to know the climate but if it just sayed it was warm that wouldn't be enough information
CAN I PLS HAVE BRAINLIEST. I NEVER GET IT. ITS A LITTLE CROWN UNDER MY ANSWER. PLS. ILL GIVE YOU BRAINLIEST JUST PLS
a current of 1.5 a is flowing through a 4 resistor.
Answers
Answer:
than what can i do lol
How many moles of glucose (C,H,,,) can be made from 12.5 moles of carbon?
Answers
Answer: 25 moles
Explanation:
I remember learned this in last year AP Chemistry class
Why does the salt reappear when the water ?
Answers
Answer:
Explain that as the water evaporates, water molecules go into the air. The water molecules that evaporate become a gas called water vapor. Only the water evaporates, leaving the sodium and chloride ions behind. The sodium and chloride ions attract each other and re- form salt crystals.
Hope this helps!! :D
Worth 20 points will mark you brainliest!
Answers
What do we mean when we say a chemical reaction is balanced? (Several choices can be correct.)
There is an equal number of solids, liquids, and gases on both sides of the reaction arrow.
There is an equal number of products on the right side of the equation as there are reactants on the left side of the
arrow.
The total number of each atom is the same on both sides of the reaction arrow.
The net charge on both sides of the reaction arrow is the same.
Answers
Answer:
2 and 3
Explanation:
A chemical reaction is defined as the process in which two or more reactants combined together chemically and gives a different product.
A balanced chemical equation involves an equal number of atoms on the reactant and product side. A balanced chemical reaction occurs when the atoms present on the reactant side or left side of the arrow is equal to the atoms on the product side or right side of the arrow.
The process of the balanced chemical equation is based on errors and trials in which the atoms in each element is identified, the atoms are then multiplied with required numbers, the addition of coefficient in front of molecules and check the equation at last.
Hence, the correct options are "2 and 3".
plz help with 1 i don’t know what to answer as!!
Answers
Answer: results are based on a small sample size
Explanation:
the other answers wouldnt make sense
Answer:
A. It can be reproduced.
Explanation:
I saw the other answer and I have to disagree. A small scale experiment wouldn't have much data so it may not be completely accurate. If it can be reproduced it means it is possible and has the same results. Scientists copy each other's things to prove or disprove them (this also goes with how it should be reviewed by peers)
everything else wouldn't make sense
Match each term below with its definition or description.
1 The point in a titration when the added amount of standard reagent is equal to the amount of analyte being titrated.
2 The analyte is titrated with the standard reagent and the volume of standard solution required to complete the reaction is measured.
3 A reagent that is pure and stable, which can be used directly after weighing.
4 The analyte that is being analyzed in the titration.
5 Standard reagent is added in excess to ensure complete reaction with the analyte. The excess reagent is then titrated with a second standard reagent.
6 A solution, whose concentration is known, often made from a reagent of known purity.
7 The standard reagent of known concentration that is added from a buret to the analyte solution.
8 The analyte does not react directly with the titrant so it is converted to another form which will react with the titrant.
9 The point in a titration when a change in the analyte solution is observed, indicating equivalency.
10 It is added to the analyte solution and aids in the observation of the completion of the reaction.
a) End Point
b) Indicator
c) Direct Titration
d) Back Titration
e) Indirect Titration
f) Primary Standard
g) Standard Solution
h) Titrand
i) Equivalence Point
j) Titrant
Answers
Answer:
1. Equivalence point
2. Direct titration
3. Primary standard
4. Titrand
5. Back titration
6. Standard solution
7. Titrant
8. Indirect titration
9. End point
10. Indicator
Explanation:
1. The equivalence point is the tiration point at which the quantity or moles of the added titrant is sufficient or equal to the quantity or moles of the analyte for the neutralization of the solution of the analyte.
2. Direct titration is a method of quantitatively determining the contents of a substance
3. A primary standard is an easily weigh-able representative of the mount of moles contained in a substance
4. A titrand is the substance of unknown concentration which is to be determined
5. The titration method that uses a given amount of an excess reagent to determine the concentration of an analyte is known as back titration
6. A standard solution is a solution of accurately known concentration
7. A titrant is a solution that has a known concentration and which is titrated unto another solution to determine the concentration of the second solution
8. Indirect titration is the process of performing a titration in athe reverse order
9. The end point is the point at which the indicator indicates that the equivalent quantities of the reagents required for a complete reaction has been added
10 An indicator is a compound used to visually determine the pH of a solution.
The titration has been the neutralization reaction in which the titrand and the titrant react to form the salt and the water and help in the determination of the qualitative and quantitative properties.
What is an Endpoint?In a titration reaction, the endpoint has been the point at which the equivalent amount of reagent has been completely neutralized.The Indicator has been the chemical that changes to indicate the endpoint of the reaction.Direct titration involves the reaction for the quantitative determination of the substances.The back titration can be given as the reaction in which the excess reagent is used to titrate the second standard reagent in the reaction.Indirect titration can be given as the reaction of the analyte to convert to another form and then the analysis with the titrant.The primary standard has been the known concentration of the pure and stable weighing reagent.The standard solution has been the solution of the known concentration in the reaction.Titrand has been the unknown sample that has to be analyzed.The equivalence point is the concentration point at which the quantity of titrant added to the titrand has been equal.Titrant has been the known concentration of sample that has been added to equivalent the unknown sample.Learn more about titration here:
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What are the effects of to much nitrogen in the water?
Answers
Answer:
Too much nitrogen and phosphorus in the water causes algae to grow faster than ecosystems can handle. Significant increases in algae harm water quality, food resources and habitats, and decrease the oxygen that fish and other aquatic life need to survive.
Explanation:
calculate delta g for an electrochemical cell reaction that occurs under basic aques condittitons based on the following two half-reactions for which the standard reduction potentials are given. Use the smallest whole-number coefficients possible when balancing the overall reaction. Cd(OH)2 + 2e- ---> Cd + 2OH- -0.824VNiO(OH) + H2O + e- ---> Ni(OH)2 + OH- +1.32V
Answers
The ΔG for the electrochemical cell reaction under basic aqueous conditions is approximately -414,652 J/mol.
To calculate the ΔG for the electrochemical cell reaction under basic aqueous conditions, first balance the overall redox reaction using the half-reactions provided.
Oxidation half-reaction (multiply by 2 to balance electrons):
2[Cd(OH)2 + 2e- → Cd + 2OH-]; E° = -0.824V
Reduction half-reaction:
NiO(OH) + H2O + e- → Ni(OH)2 + OH-; E° = +1.32V
Balanced redox reaction:
2Cd(OH)2 + NiO(OH) + H2O → 2Cd + Ni(OH)2 + 5OH-
Now, calculate the cell potential E°cell by subtracting the oxidation potential from the reduction potential:
E°cell = E°red - E°ox = (+1.32V) - (-0.824V) = +2.144V
Next, calculate ΔG using the Nernst equation:
ΔG = -nFE°cell
n = number of electrons transferred (in this case, n=2)
F = Faraday constant (96,485 C/mol)
ΔG = -(2)(96,485 C/mol)(+2.144V) = -414,652 J/mol
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Imagine that you move a substance from one container to another and its volume changes.
What state of matter is that substance?
gas
solid
liquid
Answers
Answer:
Gas
Explanation:
If you move a substance from one container to another and its volume changes, the substance is a gas. This is because, gases do not have fixed volume and shape; their shape and volume depend on the container used.
Answer:
I think gas.
Explanation:
Because gas doesn't have fixed shape and size.
1. In the process of convection, heat travels
a.from side to side
b.upwards
c.downwards
d.in all direction
Answers
Answer:
option d in all direction
Explanation:
very firstly you have to understand that what is convection convection is a process of heat transfer which is takes place due to molecules and you know moleculescan easily travels with any sites from side to side upwards or downwards so the answer will be in all directionif such an isotope existed, which one would be best to use for establishing the age of an archeological site that is about 50,000 years old?
Answers
The most reliable isotope to use to determine the age of an archaeological site that is about 50,000 years old is carbon-14.
A radioactive isotope of carbon with a half-life of roughly 5,700 years, carbon-14 decays over time. This makes it the perfect option for dating artifacts that are older than 50,000 years. Radiocarbon dating is the process of using carbon-14 to establish an archaeological site's age. The process entails calculating the amount of carbon-14 that is still present in a sample and comparing it to the amount that was initially present when the sample was alive.
The rate of carbon-14 decay can then be used to determine the sample's age. For dating archaeological materials like bones, teeth, charcoal, and wood, this technique has been used extensively.
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Consider the reaction below.
21 (aq) + Cl₂(g) →→2C1¯(aq) +12(aq)
Which half reaction correctly describes the reduction that is taking place?
O Cl2(g) +2e2C1(aq)
O Cl2(g) + e->2Cl¯ (aq)
O2 (aq)12(aq) + 2e¯
21 (aq) 12(aq) + e¯
Answers
2Cl + 2e⁻ → 2Cl⁻ is the half reaction correctly describes the reduction that is taking place.
What is Reduction Half Reaction ?The half reaction of overall reaction in which reactants gain its electrons during the reaction is called Reduction Half Reaction.
What is Oxidation Half Reaction ?The half reaction of overall reaction in which reactant loses electrons during the reaction is called Oxidation Half Reaction.
The given reaction is
2I⁻ (aq) + Cl₂ (aq) → 2Cl⁻ (aq) + I₂ (aq)
Reduction Half Reaction: 2Cl + 2e⁻ → 2Cl⁻
Oxidation Half Reaction: 2I⁻ - 2e⁻ → 2I
Here Cl₂ is an oxidizing agent and I⁻ is reducing agent.
Thus from the above conclusion we can say that 2Cl + 2e⁻ → 2Cl⁻ is the half reaction correctly describes the reduction that is taking place.
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The following chemical reaction takes place in aqueous solution: SnSO 4 (aq)+2 NaOH(aq) Sn(OH) 2 (s)+Na 2 SO 4 (aq) Write the net tonic equation for this reaction.
Answers
The net ionic equation for the reaction between SnSO₄ and NaOH is:
Sn²⁺(aq) + 2OH¯(aq) —> Sn(OH)₂(s)We'll begin by writing the dissociation equation for SnSO₄ and NaOH.
SnSO₄(aq) —> Sn²⁺(aq) + SO₄²¯(aq)
NaOH(aq) —> Na⁺(aq) + OH¯(aq)
In solution, the reaction will proceed as follow:
SnSO₄(aq) + NaOH(aq) —>
Sn²⁺(aq) + SO₄²¯(aq) + Na⁺(aq) + OH¯(aq) —> Sn(OH)₂(s) + Na⁺(aq) + SO₄²¯(aq)
Cancel the spectator ions (i.e Na⁺ and SO₄²¯) and write 2 before OH¯ to obtain the net ionic equation.
Sn²⁺(aq) + 2OH¯(aq) —> Sn(OH)₂(s)
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