We are given:
half-life of carbon = 5715 years
Initial mass = 100 grams
Final mass = 12.5 grams
Finding the time taken:
Number of half-lives:
We know that in the relation:
[tex]\frac{Final\_mass}{Initial\_mass} = \frac{1}{2^{n}}[/tex], n is the number of half-lives taken
replacing the given values:
12.5 / 100 = 1/2ⁿ
1/8 = 1/2ⁿ
2ⁿ = 8
2ⁿ = 2³
n = 3
Hence, it took 3 half-lives to reduce the mass to 12.5 grams
Number of years:
Time taken = 3 half-lives
we know that one half-life is 5715 years, replacing that value:
Time taken = 3*(5715) years
Time taken = 17145 years
Therefore, after 17145 years, a 100 gram sample of carbon will decay and only 12.5 grams will remain
Every system in the body is made from atoms, molecules, cells, tissues, and organs. These building blocks all work together to allow you to grow, obtain energy, move, stay healthy, and reproduce. Each system provides a different function to support life. Which of the following is a control system in the body?
Circulatory
Reproductive
Nervous
Muscular
Answer:
THE RIGHT ONE IS THE NERVOUS SYSTEM
Explanation:
THE EXPLANATION IS THAT : The nervous system is the part of an animal's body that coordinates its behavior and transmits signals between different body areas. In vertebrates it consists of two main parts, called the central nervous system (CNS) and the peripheral nervous system (PNS). The CNS contains the brain and spinal cord.
If a dog has a mass of 17.3 kg, what is its mass in the following units? Use scientific notation in all of your answers.
Answer:
what are the following units????
Explanation:
MY DOG WAS FAT BUT HE GOES TO GYM NOW, CAN BENCH LIFT 100 LBS :D
JK
A sample of AgCl is treated with 5mL of 2M Na2CO3 solution to produce Ag2CO3. The remaining solution contained 0.003gm of Cl per litre. Calculate solubility product of AgCl.(Ksp of Ag2CO3=8.2×10^-12)
Answer: The solubility product of AgCl is [tex]10.73 \times 10^{-9}[/tex].
Explanation:
The reaction equation is as follows.
[tex]Ag_{2}CO_{3} \rightleftharpoons 2Ag^{+} + CO^{2-}_{3}[/tex]
Let us assume the concentration of [tex]2Ag^{+}[/tex] is 2S and concentration of [tex]CO^{2-}_{3}[/tex] is S. Hence, the expression for [tex]K_{sp}[/tex] of this reaction is as follows.
[tex]K_{sp} = [Ag^{+}]^{2}[CO^{2-}_{3}]\\8.2 \times 10^{-12} = (2S)^{2}(S)\\8.2 \times 10^{-2} = 4S^{3}\\S = 1.27 \times 10^{-4}[/tex]
This means that [tex][Ag^{+}][/tex] is [tex]1.27 \times 10^{-4}[/tex]. Now, the concentration of [tex]Cl^{-}[/tex] is calculated as follows.
[tex][Cl^{-}] = \frac{mass}{molar mass}\\= \frac{0.003 g}{35.5 g/mol}\\= 8.45 \times 10^{-5} M[/tex]
Hence, [tex]K_{sp}[/tex] for AgCl is calculated as follows.
[tex]K_{sp} = [Ag^{+}] \times [Cl^{-}]\\= 1.27 \times 10^{-4} \times 8.45 \times 10^{-5}\\= 10.73 \times 10^{-9}[/tex]
Thus, we can conclude that solubility product of AgCl is [tex]10.73 \times 10^{-9}[/tex].
If 14.7 g of NO2 are reacted, what mass of H2O is reacted with it?
Answer:
no se englesh
ajajajaja
How many short columns are on the periodic table?
Answer:
They are 4 short column on the periodic table
How much energy (in J) is lost when a sample of iron with a mass of 28.3 g cools from 66.0 degrees celsius to 24.0 degrees celsius.
Answer:
-533.68J
Explanation:
Using the formula as follows:
Q = m × c × ∆T
Where;
Q = amount of heat required (Joules)
m = mass of substance (g)
c = specific heat of substance (J/g°C)
∆T = change in temperature (°C)
According to the information provided in this question;
Q = ?
m = 28.3 g
c of iron = 0.449 J/g°C
∆T = 24°C - 66°C = -42°C
Using the formula, Q = m × c × ∆T
Q = 28.3 × 0.449 × (-42)
Q = -533.68
Q = -533.68J
This means that 533.68J is lost to the environment when iron of 28.3g cools from 66°C to 24°C.
bahobilat at dakobilat
Answer:
sorry i didn't understand your question can you explain me your question have a good day hope its helps you ☺
PROBLEM 1.22 Give the hybridization state of each carbon in the following
compounds:
(a) Carbon dioxide (0 = C = O)
(d) Propene (C*H_{3}*CH = C*H_{2})
(b) Formaldehyde (H_{2}*C = O)
(e) Acetone [(CH 3 ) 2 C = OI
(c) Ketene (H_{2}*C = C = O)
(f) Acrylonitrile ( C*H_{2} =CHC equiv N)
SAMPLE SOLUTION
(a) Carbon in C*O_{2} is directly bonded to two other atoms. It
is sp-hybridized.
To solve this we must be knowing each and every concept related to hybridisation. Therefore, the hybridisation of the given molecule can be given as below.
What is hybridisation?Only during bond formation does hybridization occur, not in an individual gaseous atom. If the bonding of a molecule is known, the geometry of the molecule may be predicted.
compound hybridisation
Carbon dioxide (0 = C = O) sp
Propene (CH[tex]_3[/tex]CH = CH[tex]_2[/tex]) sp³, sp²,sp²
Formaldehyde (H[tex]_2[/tex]C = O) sp²
Acetone [(CH[tex]_3[/tex] )[tex]_2[/tex] C = O sp³, sp², sp³
Ketene (H[tex]_2[/tex]C = C = O) sp², sp
Therefore, the hybridisation of the given molecule can be given as above.
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What is an Alkanoate?
Answer: Alkanoate (plural alkanoates) (organic chemistry) Any salt or ester formed from the reaction of an alkaloic acid and alkaloids
Explanation: I looked in my dictionary and found this. I hope this helped
Please help ASAP!!
Explain why a pond at 18 °C has more thermal energy than a cup of boiling water at
100 °C.
Answer:
The pond has more energy because I is so much larger that the Cup of boiling water. Since that mass of the pond is so much larger, It is generating more energy than a boiling cup of water.
Most energy resources used by humans are nonrenewable. Which of the following is NOT a nonrenewable energy resource?
A coal
B natural gas
C oil
D wind
Answer:D wind
Explanation:
Most energy resources used by humans are nonrenewable. Wind is not a nonrenewable energy resource. Therefore, option D is correct.
What are nonrenewable energy resource ?Energy derived from fossil fuels including coal, crude oil, natural gas, and uranium is referred to as non-renewable energy. Non-renewable energy requires human intervention to make it appropriate for use, in contrast to renewable energy.
Fossil fuels made of carbon are one instance. With the use of heat and pressure, the original biological substance transforms into a fuel like gas or oil.
A renewable energy source is wind power. Water does not pollute, it cannot run out, and it lessens the need for fossil fuels, which are where greenhouse gases that contribute to global warming are produced.
Thus, option D is correct.
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9)
Which solution will have the highest concentration of solute particles?
A) 0.50 M NaCl
B) 1,00 M CaCl2
C) 2.00 M sodium ions
D) 2.50 M C6H1206
Answer: The answer is B) 1.00 M CaCl2
Explanation: I just did it on usatestprep and it said it was correct .
HELP!!! Please
A Probability Swim in Lake S Orbital
1. How did you determine where the lake was most likely to be?
2. Why was it important to take ten obse
swimmers were located?
3. Explain why the statement "electrons are always located close to the nucleus of an atom" is not really accurate,
Separating mixtures into their components depends on the differences in the components'
A. phases
B. states of matter
C. physical properties
D. chemical properties
Answer:
D
Explanation:
chemical properties
I'm not sure abt it but hope that helps
How many grams of chromium are in 2.0 x 1024 atoms
Answer: 173 g ( 0.17 kg in right accuracy)
Explanation: Amount in moles is n = N/Na = 2.0·10^24 / 6.022·10^23 (1/mol).
n = 3.32116 mol. M(Cr) = 52.00 g/mol and mass m = nM = 172.7 g
Identify the Precipitation Reaction Below:
A) CH4(g) + 2 O2(g) → CO2(g) + 2 H2O(g)
B) H2SO4(aq) + 2 LiOH(aq) → 2 H2O(l) + Li2SO4(aq)
C) Mg(s) + Cu(NO3)2(aq) → Mg(NO3)2(aq) + Cu(s)
D) HCl(aq) + (NH4)2S(aq) → H2S(g) + 2 NH4Cl(aq)
E) NaCl(aq) + AgNO3(aq) → AgCl(s) + NaNO3(aq)
Answer:
(E)
Explanation:
When aqueous solutions are added together, one of the products is s solid.
Explain the phenomenon of diffussion.
Answer:
the movement of particles from a higher consentration to a lower consentration through a mechanical support.
Explanation:
No links!! Round two decimal places please
Answer:
255.46 grams NO3
Explanation:
The molar mass of NO3 is 62.0049 g/mol.
To get grams from moles, multiply the moles by the molar mass.
4.12*62.0049 = 255.4602 = 255.46 grams NO3
Give two ways a globe is like the earth and two ways a globe is not like the earth.
Its a homework question and I'm to lazy to think HELP PLEASE
Answer:
A glove is like the earth because...
A globe is like the earth in that it is a three-dimensional representation of the earth's features, such as countries, oceans, and landmasses.
A globe is also like the earth in that it can rotate on its axis, which allows the viewer to see different parts of the earth depending on the angle of rotation.
A globe is not like the earth because...
A globe is not like the earth in that it is typically much smaller than the earth.
A globe is also not like the earth in that it does not depict the earth's relief features, such as mountains and valleys, in their true proportion to the rest of the earth's surface.
A globe is like the earth in that it is a scaled-down, spherical model of the earth's surface, representing physical features accurately. However, a globe is not like the earth because it is much smaller and does not rotate or revolve.
Explanation:The globe and the earth are similar in two main ways. First, a globe is a scaled-down model of the earth, showing an accurate representation of the earth's surface. This includes physical features such as continents, oceans, and countries, which are mapped out precisely. Second, a globe is spherical, just like the earth.
However, there are differences between a globe and the earth. One key difference is the scale: the earth is far larger than any globe. The most obvious point of difference is the size: while a globe is small enough to be held in your hands or placed on a desk, the earth has a diameter of approximately 7,917.5 miles. Also, the globe is a static object, it does not rotate on its axis or revolve around the sun like the earth does.
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What would the Kc value be from this reaction: H2 + I2 = 2HI.
(Because of the coefficient "2" in front of HI, you will have to square the concentration
of HI to find Kc. Kc = ?
Answer: The value of [tex]K_{c}[/tex] for the given reaction is [tex]K_{c} = \frac{[HI]^{2}}{[H_{2}][I_{2}]}[/tex] .
Explanation:
The ratio of concentration of products and reactants raised to the power of their concentration is called equilibrium constant.
It is denoted by the symbol [tex]'K_{c}'[/tex].
For example, [tex]H_{2} + I_{2} \rightarrow 2HI[/tex]
The expression for [tex]K_{c}[/tex] of this reaction is as follows.
[tex]K_{c} = \frac{[HI]^{2}}{[H_{2}][I_{2}]}[/tex]
So, by putting the respective concentrations of the species involved in the reaction it is possible to determine the value of [tex]K_{c}[/tex] for the given reaction.
Thus, we can conclude that the value of [tex]K_{c}[/tex] for the given reaction is [tex]K_{c} = \frac{[HI]^{2}}{[H_{2}][I_{2}]}[/tex] .
The table shows the thickness, top density, and bottom
density of the different layers of the Earth.
Which statement is supported by the information in the
table?
Thickness
(km)
Density
(g/cm)
Top Bottom
Types of Rock
Found
As depth increases, the density of the layers increases.
As depth increases, the density of the layers decreases.
As depth increases, the thickness of the layers
increases.
As depth increases, the thickness of the layers
decreases.
Crust
30
2.2
2.9
Silicic rocks
720
3.4
4.4
Upper
mantle
Peridotite
2,171
4.4
Lower
mantle
5.6
Magnesium and
silicon oxides
Outer
2,259
9.9
12.2
Iron+oxygen
core
1,221
12.8
13.1
Inner
core
Iron+oxygen
Se
[tex]\huge{\textbf{\textsf{{\color{pink}{An}}{\red{sw}}{\orange{er}} {\color{yellow}{:}}}}}[/tex]
As depth increases, the density of the layers decreases.
Thanks.Hope it helps.The statement, that describes the thickness, top density, and bottom density of the different layers of the Earth is "as depth increases, the density of the layers decreases."
What is density layers of Earth?The density of the Earth's inner layers determines their order. The densest layer is the solid metal inner core, the mantle is of intermediate density, and the lithosphere, particularly the continental lithosphere, is the least dense layer.
Pressure rises as you go deeper. Mass/volume = density. As a result, as the volume drops, so does the density. Because of pressure, the strata beneath us become extremely dense. As a result, as the depth of the earth increases, so does the density.
Hence the correct answer is as depth increases, the density of the layers decreases.
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As long as proper
safety precautions have been taken, why can explosives be transported long distances without exploding?
5. 16.3 g of NaCl is dissolved in water to make 1.75 L of solution. What is the molarity of this solution? A 0.159 M B 0.278 M C 9.31 M D 33.4 M
Answer: The molarity of this solution is 0.159 M.
Explanation:
Given: Mass of solute = 16.3 g
Volume = 1.75 L
Number of moles is defined as the mass of substance divided by its molar mass.
Hence, moles of NaCl (molar mass = 58.44 g/mol) ar calculated as follows.
[tex]Moles = \frac{mass}{molar mass}\\= \frac{16.3 g}{58.44 g/mol}\\= 0.278 mol[/tex]
Molarity is the number of moles of a substance present in a liter of solution.
So, molarity of the given solution is calculated as follows.
[tex]Molarity = \frac{no. of moles}{Volume (in L)}\\= \frac{0.278 mol}{1.75}\\= 0.159 M[/tex]
Thus, we can conclude that the molarity of this solution is 0.159 M.
A reservoir is filled with 4 billion cubic feet of polluted water that initially contains 0.4% pollutant. Every day 400 million cubic feet of pure water enters the reservoir and the well-mixed solution flows out at the same rate. When will the pollutant concentration in the lake be reduced to 0.2%
Answer:
Thus, the pollutant concentration in lake will be reduced to 0.2% after 6.931471 days
Explanation:
From the information given:
A(t) = amount of pollutant for time (t)
A 4 billion cubic ft is the same as 4000 million cubic ft:
∴
The Initial amount of pollutant is [tex]A_o = (\dfrac{0.4}{100})\times 4000[/tex]
[tex]A_o = 16 \ million \ cubic \ feet[/tex]
However;
the pollutant rate (input) = 400 × 0 = 0
the pollutant rate (output) = [tex]400( \dfrac{A(t)} {4000})[/tex]
[tex]= 1( \dfrac{A(t)} {10})[/tex]
The net rate = [tex]A'(t) = 0 - 1( \dfrac{A(t)} {10})[/tex]
[tex]\implies A'(t) = - 1( \dfrac{A(t)} {10})[/tex]
[tex]\implies \dfrac{1}{A(t)}A'(t) = -(\dfrac{1}{10})[/tex]
[tex]\implies \int (\dfrac{1}{A(t)}A'(t) ) dt = \int -(\dfrac{1}{10}) dt[/tex]
[tex]\implies In (A(t)) = -(\dfrac{1}{10})t + c[/tex]
[tex]\implies A(t) = e^{-(\dfrac{1}{10})t+c}[/tex]
[tex]\implies A(t) = Ce^{-\dfrac{1}{10}^t}[/tex]
A(0) = 16
[tex]\implies Ce^{ -(1/20)^0} = 16 \\ \\ C = 16[/tex]
[tex]\implies A(t) = 16e^{(-1/10)t}[/tex]
[tex]0.2\% \ pollutant = (\dfrac{0.2}{100})*4000 =8 \ million \ cubic \ feet[/tex]
A(t) = 8
[tex]\implies 16e^{(-1/10)t}= 8 \\ \\ \implies e^{1/10)t} = 2 \\ \\ (\dfrac{1}{10} )^t = In(2) \\ \\ t = 10\ In(2) \\ \\ \mathbf{ t = 6.931471}[/tex]
EXPLAIN Before medical images are taken, radioisotopes are often injected into a vein in a patient’s arm, or the patient drinks a solution containing the radioisotopes. Why do
you think atoms in the body usually do not emit radiation?
Answer: adioisotopes, are species of chemical elements that are produced through the natural decay of atoms. Exposure to radiation generally is considered harmful to the human body, but radioisotopes are highly valuable in medicine, particularly in the diagnosis and treatment of disease.
Explanation:
A student is studying the rate of the following reaction: C2H4O NaOH --> H20 NaC2H3O Knowing that this is an exothermic reaction, he is measuring the rate of the reaction by timing how quickly the reaction vessel heats up. He notices that if he adds HCl to this reaction, the rate increases dramatically. He also determines that the HCl is being used up during the reaction. Is the HCl a catalyst for this reaction.
Answer:
HCl is not a catalyst because these are not used up during the chemical reactions.
Explanation:
Hello there!
In this case, according to the performed experiments, it is possible for us to realize that HCl cannot be a catalyst for this reaction because it is used up during the reaction. This is explained by the fact that catalyst are able to return to the original form once the reaction has gone to completion; this is the example of palladium in the hydrogenation or dehydrogenation of hydrocarbons depending on the case. Moreover, we know that the catalysts increase the reaction rate because they decrease the activation energy of the reaction and therefore the student observed such increase.
Best regards!
Is this line real or imaginary?
Answer:
What are you talking abt
Explanation:
what is van't hoff factor?
state the formulas to calculate " i " during association or dissociation.
tysm! :)
The relationship between the calculated concentration of a material and the actual concentration of particles is known as the Van't Hoff factor.
I is the difference between a typical or theoretical colligative quality and an observable one.
What does the connection van t Hoff factor mean?The van 't Hoff factor is the difference between the concentration of a material determined by its mass and the concentration of particles actually formed when the substance is dissolved. The van 't Hoff factor is virtually 1 for the majority of non-electrolytes dissolved in water.
What does Van t Hoff factor mean in terms of connection and dissociation?For dissociation, association, and the non-electrolyte solute, the Van't Hoff factor value is more than one, less than one, and equal to one respectively.
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5 lollipops = 6 gumballs
8 gumballs = 6 lemonheads
14 lemonheads = 11
Explanation:
5 lollipops = 6 gumballs
8 gumballs = 6 lemonheads
14 lemonheads = 11 lollipops
It is in chain rule form.
Answer:
야만적 인 사랑은 누군가가 천사처럼 보이지만 야만적 인 사랑은 당신의 마음을 부러 뜨리게했다너무 귀엽다
Explanation:
난 천사야 네가 무슨 뜻인지 말해줘나는 모든 것을 가지고 나는 그것을 다시 포기하지 않을 것이다
Which statement is true about a reversible reaction? (5 points)
The forward and reverse reactions stop.
The product is a salt and the reactant is an acid.
The products react to re-form the original reactants.
The forward reaction continues but reverse reaction stops.
Answer:
C: The products react to re-form the original reactants.
Explanation:
A reversible reaction is one where the conversion of reactants to products as well as the conversion of products to reactants happen at the same time.
What this means is that the products of the reaction could react to reform the initial reactants.
Thus, option C is the correct answer.
Answer:
C
Explanation:
The products react to re-form the original reactants.