The fossil is approximately 18482 years old.
To determine the age of the fossil, we can use the concept of half-life. The half-life of carbon-14 is 5600 years, meaning that after 5600 years, half of the carbon-14 in a sample will have decayed. In this case, the fossilized leaf contains only 12% of its normal amount of carbon-14. This means that 88% of the carbon-14 has decayed.
We can set up an equation to solve for the age of the fossil. Let's assume the initial amount of carbon-14 in the leaf is N₀. After the decay, the remaining amount of carbon-14 is 0.12N₀ (12% of the initial amount). Since 88% of the carbon-14 has decayed, we have 0.12N₀ = N₀ * (1/2) (t/5600).
We can simplify the equation by canceling out N₀ from both sides and solving for t. Taking the logarithm of both sides, we have log(0.12) = (t/5600) * log(1/2). Solving for t, we get t ≈ 18482 years (to the nearest year).
Therefore, the fossil is approximately 18482 years old.
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A nearly complete skeleton, ____ is a classic example of a Neanderthal with many defining Neanderthal characteristics. Group of answer choices Taung Child La Ferrassie 1 Piltdown Man KNM-ER 1805
Answer: La Ferrassie 1
Explanation: La Ferrassie 1, often referred to as LF1, is a male Neanderthal skeleton estimated to be 70–50,000 years old. It was discovered at the La Ferrassie site in France by Louis Capitan and Denis Peyrony in 1909. The skull is the most complete Neanderthal skull ever found.
(a) Visit in your area and collect the following articles. (See lesson 4)
(i) Copper wire, (ii) Sulphur, (iii) Aluminium sheet, (iv) Iron nail, (v) Iodine crystal
Answer the following:
(a) Classify these articles into metals, and non-metals
(b) There is a brown coating on the iron nail. Explain the reason
(c) Identify good conductors of heat, and define conductivity.
(d) Write down the reaction of metals with water.
(e) Write down the reactions of non-metals with water
The periodic chart has many different types of elements. Some elements are metals, some are nonmetals, and yet others are metalloids. Therefore, in below given ways we answers can be explained.
What is metal ?Metals are hard, conduct electricity, are ductile, lustrous, and malleable materials.
Since metals have free electrons that's why they can conduct electricity. Since atoms in metals are very closely packed in a definite crystal solid. It is not brittle that is it can not be broken down easily.
Among given elements:
a)metals: Copper, Aluminium, Iron
non metals: sulfur, iodine
b) There is a brown coating on the iron nail, due to rusting
c) good conductors of heat: copper
d)M+H\(_2\)O\(\rightarrow\) M(OH)/M(OH)\(_2\)
Therefore, in above given ways we answers can be explained.
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A student mixes 20.0gof white KCl crystals with distilled water in a beaker. After the mixture was stirred, no crystals are visible and the solution is clear. After several days, all of the water evaporates and white crystals are found in the beaker. Which of following pieces of experimental evidence would best help the student to confirm that a new compound had not been made and that only a physical change occurred?
a- The solution does not change color after stirring.
b- The KCl crystals are no longer visible after mixing with water.
c- There is a temperature change in the solution during the dissolving process.
d- After the water has evaporated, the white crystals in the beaker have a mass of 20.0g
Answer:d
Explanation: over time water evaporates which leaves you with the white crystals mass
A student in a beaker mixes 20.0 g of white KCl crystals with distilled water; no crystals are visible, and the solution is clear, indicating that the physical change has occurred, which is that after the water has evaporated, the white crystals in the beaker have a mass of 20.0 g; that is option d.
What is the significance of the physical change?The physical change includes the change in the shape and size of the substances but not the chemical change, as in the case of here the crystal, which is left behind after the evaporation of the solution without any change in the chemical composition.
Hence, a student in a beaker mixes 20.0 g of white KCl crystals with distilled water; no crystals are visible, and the solution is clear, indicating that the physical change has occurred, which is that after the water has evaporated, the white crystals in the beaker have a mass of 20.0 g; that is option d.
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A new element R shows chemical properties similar to the element sodium. What is the correct formula of a compound formed with R and sulfur?
R₂S
RS₂
RS
R₂S₂
Answer:
R2S this is because sodium has one 1 valence and sulfur has valence of 2 so when they combine theyinterchange their valence
How many moles of water are produced when 5 moles of hydrogen gas react with 2 moles of oxygen gas? (5 points)
2 moles of water
4 moles of water
5 moles of water
7 moles of water
Answer: 4 moles of water
Explanation:
what are consumers? what kind of animals are they.
Answer:
There are four types of consumers: omnivores, carnivores, herbivores and decomposers. Herbivores are living things that only eat plants to get the food and energy they need. Animals like whales, elephants, cows, pigs, rabbits, and horses are herbivores. Carnivores are living things that only eat meat.
Explanation:
Would you expect the equivalence point ph of the wasb to be slightly acidic, neutral, or slightly basic? how does this compare to the sasb equivalence point ph?.
the WASB has a slightly acidic equivalence point and SASB has a slightly basic equivalence point. This is because WASB has a higher concentration of hydronium ions than SASB.
Hydronium ions play an important role in acid-base reactions. It is the hydrogen ion that is released or taken up in the acid-base reaction. The higher the concentration of hydronium ions, the more acidic the solution. In an acid-base reaction, an acid donates a hydrogen ion to a base. Bases accept hydrogen ions. This creates new water molecules. The equivalence point is the point at which an acid and a base react with 1:1 ratio. At this point the solution is neutral. If the acid has a higher concentration of hydronium ions than the base, the equivalence point is slightly acidic. This is due to the presence of more hydronium ions than at the start of the reaction. If the base has a higher concentration of hydronium ions than the acid, the equivalence point is slightly basic.
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A ____________ is a property, the expansion, redevelopment, or
reuse of which may be complicated by the presence or potential
presence of a hazardous substance, pollutant, or contaminant.
A brownfield is a property, the expansion, redevelopment, or reuse of which may be complicated by the presence or potential presence of a hazardous substance, pollutant, or contaminant.
A “brownfield” generally refers to a parcel of land that was previously used for industrial purposes and which is contaminated by low concentrations of hazardous chemicals.
A brownfield development requires more work and investment upfront: existing structures may have to be demolished, materials must be removed, and developers may have to engage in extensive environmental cleanup to remove pollutants.
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Make a list of all the possible human sources of carbon dioxide. Giving brainliest
Explain a Sport in which decreasing the amount of friction is better. PLEASEEEE!
Answer:
Swimming - the friction makes it more difficult for the swimmer to swim very fast
Explanation:
Please mark my answer as brainlists
Which is a reason that a chemical engineer would use a rate law for a reaction in a chemical plant?
A. to calculate the amount of product that would form
B. to find out which reactant would be used up fastest
C. to see how a change in a reactant concentration would affect the speed of the reaction
D. to determine how to adjust the concentrations of reactants to make the correct product
Explanation:
to see how a change in a reactant concentration would affect the speed of the chemical reaction
taylor has a mass or 500 grams
Answer:
What this dose not make sence
Explanation:
Please explaplane
Electron capture transforms 4019K into what nuclide? a) 4020Ca. b) 4018Ar. c) 42He. d) 4019K-. e) 3920Ca
Electron capture transforms 4019K into a nuclide having 18 protons and 22 neutrons. The correct answer is b) 4018Ar.
Electron capture occurs when a proton in the nucleus of an atom captures an electron from an inner electron shell, resulting in the conversion of that proton into a neutron. The process causes a decrease in the atomic number (Z) by one while keeping the mass number (A) the same.
In this case, the initial nuclide is 4019K, with 19 protons and 21 neutrons. When electron capture occurs, one proton is transformed into a neutron, so the resulting nuclide will have 18 protons and 22 neutrons which is option b) 4018Ar.
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The process of electron capture for 4019K results in the transformation of a proton to a neutron within its atom, changing it from potassium (K) to argon (Ar). Therefore, it becomes 4018Ar.
Explanation:In electron capture, an inner orbital electron is captured by the nucleus of its own atom, usually resulting in the transformation of a proton to a neutron. When a proton in 4019K undergoes electron capture, it changes from potassium (K) to argon (Ar), and its atomic number decreases by one. Therefore, 4019K is transformed into 4018Ar as a result of the electron capture.
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4) I need Two that apply. How does a cloud form?
Answer:
A cloud occurs when evaporated water condenses into visible water or ice. The three factors required in forming a cloud include: moisture, condensation, and temperature.
Explanation:
Under what conditions will deviations from the "ideal" gas be expected?
Answer:
Conditions which results in deviating a gas from "ideal" behavior are
1. Low Temperature
2. High Temperature
Explanation:
Ideal gas according to the kinetic model theory states that the conditions that apply are high temperatures where kinetic energy and low pressure is too high and the interactions in between and the container are negligible. Hence, the deviations of ideal gas falls when there is low temperature and high pressure.
Which of the following best represents Boyle's Law?A) The pressure of a gas exerted on the walls of its container is directly proportional to the volume of the gas when the temperature of the gas remains constant.B) The volume of a gas inside a container is inversely proportional to the temperature of the gas when the pressure of the gas remains constant.C) The volume of a gas inside a container is directly proportional to the temperature of the gas when the pressure of the gas remains constant.D) The pressure of a gas exerted on the walls of its container is directly proportional to the temperature of the gas when the volume of the gas remains constant.E) The pressure of a gas exerted on the walls of its container is inversely proportional to the temperature of the gas when the volume of the gas remains constant.F)The pressure of a gas exerted on the walls of its container is inversely proportional to the volume of the gas when the temperature of the gas remains constant.
Answer
F) The pressure of a gas exerted on the walls of its container is inversely proportional to the volume of the gas when the temperature of the gas remains constant.
Explanation
Boyle's law states that the volume of a given mass of gas varies inversely with the pressure when the temperature is kept constant. An inverse relationship is described in this way. As one variable increases in value, the other variable decreases. He discovered that doubling the pressure of an enclosed sample of gas, while keeping its temperature constant, caused the volume of the gas to be reduced by half.
an elementary particle that carries a positive charge
What part of a potential energy diagram reveals the enthalpy of reaction?
A. The difference in energy between the activation energy and the
products
B. The difference in potential energy between the reactants and
products
C. The difference in energy between the reactants and the activation
energy
D. The potential energy of the reactants plus the potential energy of
the products
Answer:
The difference in potential energy between the reactants and products
Explanation:
The difference in potential energy between the reactants and products reveals the enthalpy of reaction, hence option B is correct.
What is enthalpy of a reaction?The change in the enthalpy of a chemical reaction that takes place at constant pressure is known as the heat of reaction also known as the enthalpy of reaction. It is a unit of measurement for thermodynamics.
In a thermodynamic system, energy is measured by enthalpy. Enthalpy is a measure of a system's overall heat content and is equal to the system's internal energy plus the sum of its volume and pressure.
The difference between total product and total reactant molar enthalpies, computed for substances in their standard states, is the standard enthalpy of reaction for a chemical reaction.
Therefore, the difference in potential energy between the reactants and products reveals the enthalpy of reaction, hence option B is correct.
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calculate the standard free-energy change, in kilojoules, at 25 °c for the reaction 3 pb (s) 2 fe3 (aq) → 3 pb2 (aq) 2 fe (s) e∘cell = 0.090 v
a. 52 kJ b. -52,000 kJ c. -52 kJ d. -26 kJ
The answer is (c) -52 kJ by using the formula the formula for calculating the standard free-energy change (ΔG°) is:
ΔG° = -nFE°
Where n is the number of moles of electrons transferred in the balanced chemical equation, F is the Faraday constant (96,485 C/mol e^-), and E° is the standard cell potential.
In this case, the balanced chemical equation is:
3 Pb(s) + 2 Fe3+(aq) → 3 Pb2+(aq) + 2 Fe(s)
The number of moles of electrons transferred is 6 (3 electrons for each of the two Fe3+ ions). So n = 6.
The standard cell potential is given as E°cell = 0.090 V.
Plugging these values into the formula, we get:
ΔG° = -nFE°
ΔG° = -(6 mol e^-)(96,485 C/mol e^-)(0.090 V)
ΔG° = -52,006 J
ΔG° = -52 kJ (rounded to the nearest kilojoule)
Therefore, the answer is (c) -52 kJ.
To calculate the standard free-energy change (ΔG°) for the reaction, you can use the equation ΔG° = -nFE°_cell, where n is the number of moles of electrons transferred, F is the Faraday constant (96,485 C/mol), and E°_cell is the standard cell potential.
In this reaction, 3Pb (s) + 2Fe3+ (aq) → 3Pb2+ (aq) + 2Fe (s), the number of moles of electrons transferred (n) is 6 (2 electrons for each Pb, 3Pb in total).
ΔG° = -nFE°_cell = -6 × 96,485 C/mol × 0.090 V
ΔG° = -519,570 J/mol or -52 kJ/mol (rounded to nearest kJ)
So, the correct answer is c. -52 kJ.
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To calculate the standard free-energy change (ΔG°) at 25°C for the reaction 3 Pb(s) + 2 Fe³⁺(aq) → 3 Pb²⁺(aq) + 2 Fe(s) with E°cell = 0.090 V, follow these steps:
1. Use the formula: ΔG° = -nFE°cell, where n is the number of moles of electrons transferred, F is Faraday's constant (96,485 C/mol), and E°cell is the standard cell potential.
2. Determine the number of moles of electrons transferred (n) by balancing the half-reactions:
Pb(s) → Pb²⁺(aq) + 2e⁻ (oxidation half-reaction)
Fe³⁺(aq) + 3e⁻ → Fe(s) (reduction half-reaction)
Multiply the first half-reaction by 3 and the second half-reaction by 2 to balance the number of electrons:
3Pb(s) → 3Pb²⁺(aq) + 6e⁻
2Fe³⁺(aq) + 6e⁻ → 2Fe(s)
Therefore, n = 6.
3. Plug the values into the formula: ΔG° = -6 * 96,485 * 0.090.
4. Calculate ΔG°: ΔG° = -51,960 J or -51.96 kJ.
The closest answer is (c) -52 kJ. So, the standard free-energy change at 25°C for this reaction is approximately -52 kJ.
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Calculate the amount of heat needed to convert 230.0 g of ice at -10.0ºC to liquid water at 10.0ºC.
The heat required to raise the temperature of ice from -10.0ºC to 10.0ºC is 22.2 KJ.
The heat needed to convert 230.0 g of ice at -10.0ºC to liquid water at 10.0ºC is the sum of the latent heat of fusion of ice and the heat required to raise the temperature of the resulting water to.
Hence, the heat required is obtained from;
H = Heat required to raise the temperature from -10.0ºC to 0ºC + Heat required to convert ice to water + Heat required to raise the temperature of water from 0ºC to 10.0ºC
H =[0.23 × 2090 × (0 - (-10.0))] + [0.23 × 33600] + [0.23 × 4186 × ( 10 - 0)]
H = 4807 + 7728 + 9627.8
H = 22.2 KJ
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According to the diagram which statement best describes what happens when two astronauts collide in space? Will give crown!!!!
Answer:
J. Their momentum is conserved
Explanation:
According to the diagram, the best statement that describes what happens when two astronauts collides in space is that their momentum is conserved.
The momentum before collision is 320kgkm/hr and after collision it is 320kgm/s
This collision is an inelastic collision;
momentum before = momentum after
m₁v₁ + m₂v₂ = v(m₁ + m₂)
m₁ = 80kg
v₁ = 4km/hr
m₂ = 80kg
v₂ = 0
v = 2km/hr
Insert the parameters;
(80 x 4) + (80 x 0) = 2(80 + 80)
320 = 320
for the following reaction, 4.57 grams of carbon (graphite) are mixed with excess oxygen gas . the reaction yields 13.2 grams of carbon dioxide .
The reaction between carbon (graphite) and oxygen gas produces carbon dioxide. If 4.57 grams of carbon are mixed with an excess of oxygen, the reaction will yield 13.2 grams of carbon dioxide.
The balanced chemical equation for this reaction is:
C + \(O_{2}\) -> \(CO_{2}\)
To determine the amount of oxygen required for the reaction, we need to calculate the number of moles of carbon involved. We can do this by dividing the mass of the carbon by its molar mass:
4.57 g / 12.01 g/mol = 0.380 mol
Since the reaction requires a 1:1 stoichiometric ratio between carbon and oxygen, we need 0.380 mol of oxygen.
The amount of carbon dioxide produced can be calculated by multiplying the number of moles of carbon by the molecular weight of CO2:
0.380 mol × (44.01 g/mol) = 16.78 g
However, since only 13.2 grams of \(CO_{2}\) were actually produced, we can conclude that the reaction was limited by the amount of carbon and not by the amount of oxygen. This means that not all of the carbon was able to react with the oxygen and some was left over after the reaction.
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help pls i need help and i’m tired i took 15 test today-
Answer:
3
Explanation:
Lithium's atomic number is 3. it has 3 protons in its model
Express the morality of a solution that contains 0.5 mol of calcium acetate per 1.0 L of solution.
The concentration terms are molality, normality and mole fraction. Molarity can be used to find out the ionic strength of any solution. Therefore, the Molarity of a solution that contains 0.5 mol of calcium acetate per 1.0 L of solution is 0.5 M.
What is molarity?Molarity can be calculated by dividing number of moles of solute by volume of solution in litre. Molarity is affected by temperature. Its unit is mole/liter. It measure the concentration of any solute in a solution.
Mathematically,
Mathematically,
Molarity= number of moles of solute/volume of solution in litre
Where,
moles= 0.5 mol
Volume=1.0 L
Substituting values in above equation, we get
Molarity= 0.5 mol /1.0 L
=0.5 M
Therefore, the Molarity of a solution that contains 0.5 mol of calcium acetate per 1.0 L of solution is 0.5 M.
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if 1 mol cs2 reacts with 1 mol o2 identify the limitng reactant
Answer:
Explanation:
In the reaction of 1 mol CS2 and 1 mol O2, carbon disulfide (CS2) is the limiting reactant.
This is because when 1.00 mol CS2 reacts with 1.00 mol O2
, it requires 3 moles of oxygen to completely react with the carbon disulfide(CS2).
Therefore, since there is only 1 mole of oxygen present in the reaction, it cannot completely react with the carbon disulfide and thus becomes the limiting reactant.
cs2 + o2 = co2(g) + so2(g)
1 1 1 1 (moles)
as we can see from the reaction and stoichiometric coefficient of cs2 and o2 is 1 so both will completely react and no one is limiting reactant .
limiting reagent- reactant which remains unreacted after the completion of reaction.
I need help on this question asap!
You are in a lab and you use 11.50 g of Na(s) to react with Cl(g). Below is the reaction that happens from this.
Na + Cl2 → NaCl
Your percent yield is 95%. From this info what is the actual yield?
Answer:
27.79 g to the nearest hundredth.
Explanation:
2Na + Cl2 ---> 2NaCl
Using the molar masses , the theoretical yield is:
46 g of Na yields 46 + 35.5*2 g NaCl
46 g ---> 117 g NaCl so
11.5 g ----> 117 * 11.5 / 46 g NaCl
But, as the yield is 90%
the actual yield is 0.95 * 117 * 11.5 / 46
= 27.79 g.
What is the formula of barium phosphite?
a. \(\mathrm{ba}_3\left(\mathrm{po}_3\right)_2\)
b. \(\mathrm{ba}_2\left(\mathrm{po}_3\right)_3\)
c. \(\mathrm{ba}_3\left(\mathrm{po}_4\right)_2\)
d. \(\mathrm{ba}_2\left(\mathrm{po}_4\right)_3\)
e. \(\mathrm{bapo}_3\)
f. \(\mathrm{bapo}_4\)
The formula of barium phosphite is Ba₃(PO₄)₂.
A salt that is classified as inorganic is barium phosphate. The chemical formula for barium phosphate is Ba₃(PO₄)₂. Although barium phosphate is typically thought of as a colorless solid, it does have a fading odor resembling that of acetic vinegar. The barium phosphate structure was identified by the X-ray crystallography experiment as a connection of barium ions with the phosphate, Ba₂⁺ cations connected to a polyphosphate anion. The salts or esters that are created when tetrahedral PO₄ is transformed into a polyphosphate anion (phosphate). The oxygen atom that the structural unit shares is what binds it together. One of the hydrated forms of barium phosphate is barium phosphate dihydrate.
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a sample of a hydrocarbon contains 2.59x1023 atoms of hydrogen and is 17.3% hydrogen by mass. if the molar mass of the hydrocarbon is between 55 and 65 g/mol. what is the molecular formula of the compound?
The molecular formula of a compound containing 2.59 × 10²³ atms of hydrogen and 17.3% hydrogen by mass is C₄H₁₀.
Let us assume that we have 100g of the original sample.
The number of moles of C and H can be calculated as:
Number of moles of H
= 17.3g × 1 mol H/ 1.008g
=17.2 mol
Number of moles of C
=(100-17.3)g × 1 mol C / 12.01 g C
=6.89 mol C
The smallest atomic ratio for H is
=17.2/6.89
=2.50
The smallest atomic ratio for carbon is
=6.89/6.89
=1
To round off the smallest atomic ratio, we need to multiply both of them by 2
Thus, smallest atomic ratio for carbon= 1×2=2
smallest atomic ratio for hydrogen= 2.5×2 =5
Thus, the empirical formula is C₂H₅
let, (C₂H₅)n be the molecular formula
molecular mass of the compound C₂H₅= 58 g
⇒ (C₂H₅)n =58
⇒(2×12+15)n =58
⇒n= 58/29
⇒n=2
Thus molecular formula of the compound (C₂H₅)₂ is
=C₄H₁₀
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A group of students are measuring how the acceleration of a mass will change when it is acted
on by different forces. The group uses a constant mass for each test. Then, they use a sensor to
measure the mass's acceleration as it is acted on by different forces.
Which scatter plot most closely matches the measurements that you would expect the students
to find?
Choose 1 answer:
celeration (m/s²)
4 of 4
Chec
The scatter plot that shows a positive correlation between force and acceleration.
What is the relationship between acceleration of an object and the applied force?The acceleration of an object is the change in velocity with time.
Acceleration = change in velocity/timeForce is defined as an agent which causes a change in the motion or state of rest of a body.
According to Newton's law of motion, the rate of change of velocity of an object is directly proportional to the applied force and takes place in the direction of the applied force.
Force and acceleration have a positive correlation.
Therefore, the scatter plot which will most closely match the measurements that the students will obtain is that which shows a positive correlation between force and acceleration.
In conclusion, acceleration of a object is proportional to the applied force.
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solute separates as a solid when a saturated solution is cooled why
Answer:
When a saturated solution at a high temperature is cooled, why is the solution separated as a solid? When a saturated solution at a high temperature is cooled, inter molecular space between the molecules of the solution decreases. As a result, no more solute can remain in a solution separating out as a solid crystal.