If a fossil contains 1 part carbon 14 to 7 parts nitrogen 14, how old is it?
Answers
The fossil is approximately 17,100 years old.
The age of a fossil can be estimated by using the half-life of carbon-14. The half-life of carbon-14 is approximately 5,700 years, which means that after this time, half of the carbon-14 in a sample will have decayed into nitrogen-14.
If a fossil contains 1 part carbon-14 to 7 parts nitrogen-14, this means that the carbon-14 has decayed to one-eighth (1/8) of its original amount. Since we know the half-life of carbon-14, we can use this information to estimate the age of the fossil.
If we assume that the fossil originally contained only carbon-14, then the number of half-lives that have passed can be calculated as follows:
1/2n = 1/8
where n is the number of half-lives that have passed.
Simplifying this equation, we get:
2n = 8
n = 3
Therefore, the fossil has undergone 3 half-lives of carbon-14 decay. Since the half-life of carbon-14 is approximately 5,700 years, we can estimate the age of the fossil by multiplying the half-life by the number of half-lives:
age = 5,700 years/half-life * 3 half-lives
age = 17,100 years.
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Related Questions
Why are Democritus' ideas still taught today?
Answers
Answer:
Democritus greatest contribution to modern science was arguably the atomic theory he elucidated. According to Democritus' atomic theory, the universe and all matter obey the following principles: Everything is composed of “atoms”, which are physically, but not geometrically, indivisible.
Explanation:
Hope this helps.
which of the following statements about the mass of an object is correct
a. mass changes with location
b. mass remains constant
c. mass changes with altitude
d. mass changes with gravity
Answers
Answer: Mass remains constant
Explanation:
WILL GIVE BRAINLIEST TO PERSON WHO ANSWERS FASTEST AND CORRECT BUT ANY ANSWERS TO JUST GET POINTS WILL GET REPORTED AND DELETED
Which is an example of condensation? *
5 points
A) water boiling in a pot
B) water being absorbed by plants
C) salt being removed from water
D) moisture on a mirror after a hot shower
Answers
Answer:
a
Explanation:
Answer:
D
Explanation:
If you have 12 atoms of hydrogen before a chemical reaction, how many atoms of hydrogen will be present
Answers
Answer:
12 atoms of hydrogen will be present in the product
Explanation:
12 atoms of hydrogen will be present in the product because the law of conservation of mass states that mass is neither created nor destroyed in chemical reactions.
The law of conservation states that the mass of the element remains the same during the course of the reaction.
The law of reaction conformed by the following:-
Mass of reactant Mass of productAccording to the question, the amount of hydrogen is 12 atoms in the reactant and the amount will remain the same at the end of the reaction, which is a product that is 12 atoms
Hence, the amount remains the same in the reaction that is 12 atoms
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What is required for a correctly written thermochemical equation?
A. a balanced chemical equation that includes the enthalpy change and phase of each reactant and product
B. a balanced chemical equation that includes the entropy change
C. a balanced chemical equation that includes the phase of each reactant and product
D. a balanced chemical equation that includes the temperature change
Please hellpp :')
Answers
Option A is the correct answer. A correctly written thermochemical equation should include a balanced chemical equation that represents the stoichiometry of the reaction, and it should also include the enthalpy change (ΔH) associated with the reaction. Additionally, it is common to include the phase (solid, liquid, gas, aqueous) of each reactant and product to provide a more complete representation of the reaction conditions. The phase information helps specify whether the substances are in gaseous, liquid, or solid form during the reaction. The entropy change (ΔS) and temperature change (ΔT) are not typically included in a thermochemical equation, although they may be relevant in certain contexts.
How do you make the balanced equation of making ammonia?
__ N² + __ H² → __ NH³
(with steps to solve)
Answers
Answer:
1, 3, 2
Explanation:
1 mole of N^2 so you have 2 N.
3 mole of H^2 so you have 6 H.
2 mole NH^3 so you have 2 N and 6 H
2N + 6H = 2N + 6H
Which principal energy level change by the electron of a hydrogen atom will cause the greatest amount of energy to be absorbed?
1. n = 2 to n = 4
2. n = 2 to n = 5
3. n = 4 to n = 2
4. n = 5 to n = 2
Answers
The transition from n = 2 to n = 5 (option 2) or from n = 5 to n = 2 (option 4) will cause the greatest amount of energy to be absorbed.
The energy absorbed by an electron transitioning between different principal energy levels in a hydrogen atom can be calculated using the formula:
\(ΔE = -13.6 eV * (1/n_final^2 - 1/n_initial^2)\)
where ΔE is the energy change, n_final is the final principal energy level, and n_initial is the initial principal energy level.
Let's calculate the energy changes for the given transitions:
n = 2 to n = 4:
\(ΔE = -13.6 eV * (1/4^2 - 1/2^2) = -13.6 eV * (1/16 - 1/4) = -13.6 eV * (1/16 - 4/16) = -13.6 eV * (-3/16) = 2.55 eV\)
n = 2 to n = 5:
\(ΔE = -13.6 eV * (1/5^2 - 1/2^2) = -13.6 eV * (1/25 - 1/4) = -13.6 eV * (4/100 - 25/100) = -13.6 eV * (-21/100) = 2.856 eV\)
n = 4 to n = 2:
\(ΔE = -13.6 eV * (1/2^2 - 1/4^2) = -13.6 eV * (1/4 - 1/16) = -13.6 eV * (4/16 - 1/16) = -13.6 eV * (3/16) = 2.55 eV\)
n = 5 to n = 2:
\(ΔE = -13.6 eV * (1/2^2 - 1/5^2) = -13.6 eV * (1/4 - 1/25) = -13.6 eV * (25/100 - 4/100) = -13.6 eV * (21/100) = 2.856 eV\)
Comparing the energy changes, we find that options 2 and 4 have the same energy change of 2.856 eV, which is greater than the energy changes for options 1 and 3 (2.55 eV).
Therefore, the transition from n = 2 to n = 5 (option 2) or from n = 5 to n = 2 (option 4) will cause the greatest amount of energy to be absorbed.
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What is the best choice of reagents to perform the following reaction? CI COOH ? CH3OH, H2SO4 , NaCN followed by H30+ O Mg, followed by CO2, then H30+ O HCOOH, H20, heat
Answers
Chlorobenzene can be converted into benzoic acid using Grignard reagent. Thus, treating with Mg metal in dry ether followed by carboxylation and then hydrolyising the product gives benzoic acid.
What is Grignard reagent?Grignard reagents are alkyl magnesium halides with the general formula RMgX. They can be prepared by treating alkyl halides with Mg metal in presence of dry ether.
Chlorobenzene when treated with Mg gives MgCl substituted benzene ring which upon carboxylation using carbon dioxide followed by hydrolysis gives benzoic acid.
Therefore, the reagents needed for the conversion of chlorobenzene to benzoic acid are Mg, CO₂ and water.
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154.42g of oxygen gas (O2) react with an excess of ethane (C2H6) produces how many moles of water vapor (H20)?
Answers
For every 60 grammes of ethane, 108 grammes of water are produced. We therefore obtain 10.8 g of water from the combustion of 6 g of ethane. As a result, is created in 0.6 moles.
How are moles determined when vapour pressure is involved?The mole fraction of the solvent must be multiplied by the partial pressure of the solvent in order to determine an ideal solution's vapour pressure. The vapour pressure would be 2.7 mmHg, for example, if the mole fraction is 0.3 and the partial pressure is 9 mmHg.
One mol of the solute is contained in one thousand grammes of the solvent (water) in a one molal solution. It follows that the solution's vapour pressure is 12.08 kPa.
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What is the organic compound?
Answers
Answer:
propa-1-nol
Explanation:
easy clapp
How many molecules of Helium are in 1.0 mole?
Answers
Answer: 6158.46
Explanation:
1 mole of helium gas contains 6.02 x1023 helium atoms. 1 mole of water contains 6.02 x1023 water molecules.
what kind of intermolecular forces act between a nitrogen trichloride molecule and a dichloroethylene ch2ccl2 molecule?
Answers
The intermolecular forces that act between a nitrogen trichloride (NCl3) molecule and a dichloroethylene (CH2Cl2) molecule are dipole-dipole interactions and dispersion forces.
Intermolecular forces refer to the attractive and repulsive forces that occur between molecules in a substance. These forces arise due to the interactions between the charges on the atoms or molecules that make up the substance. Intermolecular forces are responsible for the physical properties of matter such as melting and boiling points, surface tension, and viscosity.
The types of intermolecular forces include London dispersion forces, dipole-dipole forces, and hydrogen bonding. London dispersion forces are present in all molecules and arise due to temporary fluctuations in the electron density of the molecule. Dipole-dipole forces occur in polar molecules where the positively charged end of one molecule interacts with the negatively charged end of another. Hydrogen bonding is a type of dipole-dipole force that occurs between a hydrogen atom bonded to an electronegative atom such as nitrogen, oxygen, or fluorine and a lone pair of electrons on another electronegative atom.
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A buffer is prepared containing 1.00 M acetic acid and 1.00 M sodium acetate. What is its pH?
Answers
The pH of the buffer solution is 4.76.
To calculate the pH of the buffer solution, we need to use the Henderson-Hasselbalch equation, which is given by:
pH = pKa + log([A-]/[HA])
where pKa is the dissociation constant of the weak acid, [A-] is the concentration of the conjugate base, and [HA] is the concentration of the weak acid.
For acetic acid (CH3COOH), the pKa is 4.76.
Since the buffer solution contains equal concentrations of acetic acid and sodium acetate, we can assume that [A-] = [CH3COO-] = 1.00 M and M[HA] = [CH3COOH] = 1.00 M.
Therefore, plugging in these values into the Henderson-Hasselbalch equation, we get:
pH = 4.76 + log([1.00]/[1.00]) = 4.76
Therefore, the pH of the buffer solution is 4.76.
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One half of Barium-139 decays into another element after 86 minutes. The 86 minutes is referred to as this element's...
Select one:
a. half-life.
b. radioactive phase.
c. time zone.
d. quarter time
Answers
Answer:
d)quater time
Explanation:
that's my ans
A chemical X breaks down to chemical Y. At t=0, [B] = 0.00M at t=5.00 s, [Y] = 0.150M/ What is the average reaction rate?
Group of answer choices
-0.300 mol/Ls
0.300 mol/Ls
-0.0300 mol/Ls
0.0300 mol/Ls
Answers
this is the answer, but check the calculations first and see if it matches 0.300 mol/Ls
3. see the example in introduction for set-up of calculations. calculate the number of a) moles of n b) atoms of n in 12.7 g of nitrogen gas, n2.
Answers
There are approximately 0.453 moles of N2 and 5.45 x 10^23 atoms of N in 12.7g of nitrogen gas.
To calculate the number of moles of nitrogen gas (N2) in 12.7 g, we first need to know the molar mass of N2, which is approximately 28 g/mol.
Using this information, we can set up the following calculation:
moles of N2 = mass of N2 / molar mass of N2
moles of N2 = 12.7 g / 28 g/mol
moles of N2 = 0.454 moles
Therefore, there are 0.454 moles of N2 in 12.7 g.
We can use the following formula to calculate the number of atoms:
number of atoms = number of moles x Avogadro's number
number of atoms = 0.454 moles x 6.022 x 10^23 atoms/mol
number of atoms = 2.73 x 10^23 atoms
a) Moles of N2:
1. Find the molar mass of N2. Nitrogen has an atomic mass of 14.01 g/mol. Since N2 has two nitrogen atoms, its molar mass is 14.01 g/mol x 2 = 28.02 g/mol.
2. Use the given mass (12.7 g) and molar mass (28.02 g/mol) to calculate the number of moles: moles = mass / molar mass = 12.7 g / 28.02 g/mol ≈ 0.453 moles of N2.
b) Atoms of N:
1. Since there are two nitrogen atoms in each N2 molecule, the number of moles of nitrogen atoms (N) is twice the number of moles of N2: 0.453 moles x 2 = 0.906 moles of N.
2. To find the number of atoms, multiply the number of moles of N by Avogadro's number (6.022 x 10^23 atoms/mol): 0.906 moles x 6.022 x 10^23 atoms/mol ≈ 5.45 x 10^23 atoms of N.
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Sample H is a mineral found in this sand! This mineral is black and will stick to you when you walk through the sand at the beach. Zoom in really close - sand is very cool to look at when it is magnified. We will look at more later in the class. The sand grains that you should focus on are black. Not all of the black grains are the same mineral however the mineral you're looking for is strongly magnetic. If you ran a magnet just over the top of this sample, some of black sand grains would stick. What mineral is it?
Answers
The mineral that's illustrated based on the information given will be magnetite.
What is a mineral?A mineral simply means any pure substance that has a unique composition and structure.
Since the mineral is black and will stick to you when you walk through the sand at the beach, it's magnetite.
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What neutralizer is typically used with thio relaxers?.
Answers
The neutralizer that is typically used with thio relaxers is hydrogen peroxide (H2O2).
Thio relaxers are used to chemically straighten hair, and they work by breaking down the disulfide bonds in the hair. After the hair has been treated with the thio relaxer, a neutralizer is used to stop the chemical process and rebuild the disulfide bonds in the hair.
Hydrogen peroxide (H2O2) is the neutralizer that is typically used with thio relaxers to rebuild the disulfide bonds in the hair and stop the chemical process after the hair has been treated.
Thio relaxers work by breaking down the disulfide bonds in the hair, and a neutralizer is used to stop the chemical process and rebuild the disulfide bonds in the hair. Hydrogen peroxide (H2O2) is the neutralizer that is typically used with thio relaxers.
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The reaction below shows sodium chloride (NaCl) being produced by combining sodium (Na) with chlorine (Cl2). The mass of sodium is 50 g and the mass of chlorine is 14 g.
Na + Cl2 ----> NaCl2
Based of the Law of Conservation of Mass, what is the mass for the sodium chloride (NaCl) that was produced?
Answers
Answer:
64?
Explanation:
50+14=64
How many grams of H2O would be made from 7.9 moles of H2? (Round to one decimal place)
Answers
Answer:
2.01588 grams
Explanation:
For biomass, solar, coal, natural gas, oil, and geothermal energy, identify each energy resource as renewable or non-renewable.
Answers
Answer:
biomass is renewable
solar is renewable
coal is non-renewable
natural gas is non-renewable
oil is non-renewable
geothermal energy is renewable
Explanation:
The biomass, solar and geothermal are renewable source of energy and coal, natural gas and oil are non renewable source of energy.
What is renewable source of energy?Renewable energy is defined as the energy derived from natural source of energy that are replenished at the higher rate then they are consumed.
It can also be defined as the energy that are collected from renewable resources that are replenished on a human time scale.
Solar, wind, tidal, biomass, geothermal etc. are some of the example.
Non renewable energy is defined as the natural resource of energy that cannot be easily replaced by human means at a pace quickly enough to keep up with the consumption.
Coal, petrol, oil, natural gas, fossil fuel etc. are some of the example.
Thus, the biomass, solar and geothermal are renewable source of energy and coal, natural gas and oil are non renewable source of energy.
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The first time dicaprio heard about global warming, who told him that it was the most important issue of our time.
Answers
Why are substances such as coal and gasoline used as fuel sources?
A.They have high kinetic energy, which can be converted into electrical or mechanical
energy
B.They have large amounts of energy stored in the chemical bonds which can be
converted into kinetic energy when combusted
C.They are able to easily make endothermic reactions, which can be harnessed and
converted into mechanical energy
D. None of the above statements are true
Answers
Answer:
A.They have high kinetic energy, which can be converted into electrical or mechanical energy
Explanation:
The kinetic energy of the fast-moving water turns turbines, which drive generators that produce electricity. The energy in fossil fuels (coal, oil, gas) is Chemical Potential Energy.
If 3. 0 g of nh3 reacts with 5. 0 g of hcl, what is the limiting reactant? nh3(g) + hcl(g) --> nh4cl(s).
Answers
HCl (g)+ NH
3
(g) → NH
4
Cl (s)
which of the following compounds contain a sulfur atom that bears a +1 formal charge?a. MgSO4
b. so2 c. H2SO4
d. SF6
e. H2S
Answers
Out of the given options, the compound that contains a sulfur atom that bears a +1 formal charge is H2SO4. The correct option is c. H2SO4. Please find a long answer below:Sulfur is a chemical element with the symbol S and atomic number 16. It is a nonmetallic element and is a member of the oxygen group.
In compounds, sulfur forms an oxidation state of +6 with oxygen and a +2 oxidation state with oxygen. Sulfur also exhibits a +4 oxidation state with oxygen. The electronegativity of sulfur is 2.5 and it has six valence electrons. Now, let's discuss the given options.a. MgSO4: Magnesium sulfate is a compound that is made up of magnesium, sulfur, and oxygen. In MgSO4, magnesium has a +2 charge, sulfur has a -2 charge, and oxygen has a -2 charge. Therefore, sulfur does not have a +1 formal charge. b. SO2: Sulfur dioxide is a compound that is made up of sulfur and oxygen. In SO2, sulfur has a +4 oxidation state and oxygen has a -2 charge.
Therefore, sulfur does not have a +1 formal charge.c. H2SO4: Sulfuric acid is a compound that is made up of sulfur, hydrogen, and oxygen. In H2SO4, sulfur has a +6 oxidation state and hydrogen has a +1 charge. Therefore, sulfur bears a +1 formal charge. d. SF6: Sulfur hexafluoride is a compound that is made up of sulfur and fluorine. In SF6, sulfur has a +6 oxidation state and fluorine has a -1 charge. Therefore, sulfur does not have a +1 formal charge. e. H2S: Hydrogen sulfide is a compound that is made up of sulfur and hydrogen. In H2S, sulfur has a -2 charge and hydrogen has a +1 charge. Therefore, sulfur does not have a +1 formal charge.Hence, H2SO4 is the compound that contains a sulfur atom that bears a +1 formal charge.
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Question 4 (1 point) Listen Based on what you know about mineral groups, which mineral is most susceptible to dissolution from acids? O a) orthoclase feldspar Ob) gypsum O c) quartz d) calcite Question 5 (1 point) Listen Based on what you learned about minerals in the past, which mineral is MOST SUSCEPTIBLE to oxidation? a) calcite Ob) quartz Oc) hornblende Od) muscovite Question 6 (1 point) Listen During dissolution, what happens to the Na and Cl ions in salt? O a) they become surrounded by water molecules Ob) the ionic bonds between them are broken O c) they are attracted to water molecules due to the polar nature of water d) all of these Question 7 (1 point) Listen Which igneous composition type is most susceptible to chemical weathering? a) ultramafic Ob) mafic Oc) intermediate O d) felsic Question 12 (1 point) Listen More surface area exposure typically leads to more rapid chemical weathering. a) True b) False Question 13 (1 point) ✓ Saved Listen On Bowen's reaction series, which mineral is the least likely to be weathered? a) quartz Ob) hornblende c) augite O d) muscovite
Answers
Question 4 : Listen Based on what you know about mineral groups, which mineral is most susceptible to dissolution from acids?
Answer 4 : (d) calcite.
Question 5: Based on what you learned about minerals in the past, quartz is the most susceptible mineral to oxidation. Answer 5 : (b) quartz.
Question 6: During dissolution, the ionic bonds between Na and Cl ions are broken in salt.
Answer 6 : (b) the ionic bonds between them are broken.
Question 7: Felsic is the igneous composition type that is most susceptible to chemical weathering.
Answer 7 : (d) felsic.
Question 12: True. More surface area exposure typically leads to more rapid chemical weathering.
Answer 12 : (a) True.
Question 13: Quartz is the mineral that is least likely to be weathered on Bowen's reaction series.
Answer 13 : (a) quartz.
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Which choice best shows what ALL cells need to survive?
O A. food, water, oxygen, and energy
O B. food, water, energy, and sunlight
O C. food, water, energy, and waste removal
O D. food, water, carbon dioxide, and heat
Answers
Hope that helps!
PLZZZZZZZZ HELLLLLLLLLLLLLLLLLPPPPPP!!!!! soo stuckkkkk
Answers
Which of the five general types of reaction would most likely occur, given each set of reactants? What are the probable products?
a. A single compound is the reactant; two or more substances are the products.
...........................................................................................................................
b. Two Elements
...........................................................................................................................
c. Oxygen and a compound of carbon and hydrogen.
...........................................................................................................................
Answers
Answer:
a
Explanation:
Combination reaction.
Decomposition reaction.
Displacement reaction.
Double Displacement reaction.
Precipitation Reaction.
determine which features helium has in common with features in the vertical column that includes beryllium.
Answers
There are various common features among Both helium and beryllium in the same vertical column on periodic table such as both helium and beryllium have the same number of valence electrons, which is two. Both helium and beryllium are relatively small in size compared to other elements in their respective periods. Both helium and beryllium have relatively high ionization energies.
Helium and beryllium are both elements that are located in the same vertical column on the periodic table. This means that they share certain features and characteristics. Both these elements share various similiar feature and we can predict these features with the help of their positions in periodic table.
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