A sample of 200g of an isotope decays to another isotope according to the function
(a) How much of the initial sample will be left in the sample after 25 years?
(b) How long will it take the initial sample to decay to half of its original amount?
(a) After 25 years, about g of the sample will be left.
(Round to the nearest hundredth as needed.)

The final temperature of the water after the ice melts, given that the water has an initial temperature of 62.39°C, is 63.06 °C

We can obtain the final temperature of the water after the           ice melts as follow:

Heat of cold = -heat of warm

ML + MC(T – Tᵢ) = -MᵥᵥC(T – Tᵥᵥ)

(12.68 × 334) + [12.68 × 4.184 (T - 0)] = -316.81 × 4.184 (T - 62.39)

4235.12 + 53.05312T = -1325.53304T + 82700.0063656

Collect like terms

53.05312T + 1325.53304T = 82700.0063656 + 4235.12

1378.58616T = 86935.1263656

Divide both sides by 1378.58616

T = 86935.1263656 / 1378.58616

T = 63.06 °C

Thus, from the above calculation, we can conclude that the final temperature is 63.06 °C

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Answer:4.03

Explanation:

Be is a metal with a low level of electronegativity.

Option a is correct.

High electronegativity elements are typically electrical insulators and nonmetals, and they frequently act as oxidants in chemical processes. On the other hand, elements with low electronegativity are typically metals, excellent electrical conductors, and have a propensity to act as reluctant in chemical reactions.

Francium, which has an electronegativity of 0.7, is the lowest value of any element. The electronegativity is calculated using the Pauling scale.

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Internal reversibility, Therefore, during reversible operations, the universe's entropy changes nothing. We can see that for a reversible, adiabatic operation, the change in a system's entropy is zero.

dS=dQT=0 holds because any reversible process may be characterized as the sum of numerous infinitesimally small Carnot cycles. As a result, the entropy S is a state variable and the integral is independent of the path it takes. In strictly speaking, such route independence is only true for reversible processes.

This procedure could proceed way without breaking the second law. Reversible processes are those of the latter type. A reversible process' main characteristic internal reversibility, Therefore, during reversible operations, the universe's entropy changes nothing. We can see that for a reversible, adiabatic operation, the change in a system's entropy is zero.

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Answer:

what do you need help with

Effective nuclear charge for Main Group elements would increase left to right across a period.

We know that the effective nuclear charge has to do with the force that binds the outer electrons to the protons tat are in the nucleus. We know that the greater the effective nuclear charge, the more difficult it would be to remove an electron from the atom.

Based on this, we could say that since the size of the nuclear charge is increasing across the period, the effective nuclear charge would also be found to increase across the period.

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The final temperature is calculated to be 48.40°C.

The specific heat capacity is measured in J/(kg K) or J/(kg °C), and it is the amount of heat (J) absorbed per unit mass (kg) of the material when its temperature rises by 1 K (or 1 °C).

Calculating the mass of the 116.0 mL of water:

Given,

Mass (m)= ?

Volume (V)= 116.0 mL

Density = 1.00 g/ml

Now,

Mass = Density × Volume

         = 1.00 × 116.0

         = 116.0 g

So, mass of the 116.0 mL of water is 116.0 g

Given,

Initial temperature (T₁)  =  26.0°C

The final temperature of the water = T₂

Hence,

The change in the temperature can be calculated by,

ΔT = T₂ - T₁

Let the heat absorbed by 116.0 g of water = Q

Hence, The formula to calculate heat absorbed is,

Q = m × c × ΔT

Now,

Calculating the mass of the 71.0 mL of water:

Given,

Mass (m')= ?

Volume (V')= 71.0 mL

Density = 1.00 g/ml

Now,

Mass = Density × Volume

         = 1.00 × 71.0

         = 71.0 g

So, mass of the 116.0 mL of water is 71.0 g

Given,

Initial temperature (T'₁)  = 26.0°C

The final temperature of the water = T'₂

Hence,

The change in the temperature can be calculated by,

ΔT' = T'₂ - T'₁

Let the heat absorbed by 116.0 g of water = Q'

Hence, The formula to calculate heat absorbed is,

Q' = m' × c × ΔT'

Both the liquids are mixed and the final temperature will be equivalent and given as, ΔT₂ = ΔT'₂

According to the law of conservation,

Heat lost by the water (Q') = Heat absorbed by the water (-Q)

m × c × ΔT = m' × c × ΔT'

116 × c(T₂ - 26) = -71 × c(T₂ - 85)

T₂ = 48.40

Hence, 48.40°C is the final temperature.

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When 116.0 mL of water at 26.0°C is mixed with 71.0 mL of water at 85.0°C, the final temperature is 48.40°C.

(m)= ?

(V)= 116.0 mL

Density is 1 g/ml.

T initial (T1) = 26.0 °C

T final = T2

Mass = Density * Volume

= 1.00 116.0

= 116.0 g

T = T2 - T1;

Water absorbing 116.0 g of heat equals Q

Q = m c T.

Calculating the mass of the 71.0 mL of water:

(m')= ?

(V')= 71.0 mL

The mass of the 116.0 mL of water is 71.0 g and the density is 1.00 g/ml

(1.00 * 71.0 = 71.0 g).

The starting temperature (T'1) is 26.0 °C.

T final = T'2

Heat absorbed by 116.0 g of water equals Q'

Q' = m' c T', where

T' = T'2 - T'1.

The end temperature will be the same for both, ΔT₂ = ΔT'₂

The law of conservation states that heat transferred by the water (Q') equals heat absorbed by the water (-Q)

m c ΔT = m' c ΔT'

116 × c(T₂ - 26) = -71 × c(T₂ - 85)

T₂ = 48.40

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Measurement of temperature by Chemist involving Mean and SD:

The distribution of F is (a) F = N(104, 3.24).

A  mean is calculated by dividing the total number of values by the sum of all the values. The term "average" is frequently used to describe this measure of central tendency.

In statistics, the measurement of variability known as the standard deviation (SD) is frequently utilized. It demonstrates how different things are from the norm (mean). While a high SD shows that the data are dispersed throughout a wide range of values, a low SD suggests that the data points tend to be close to the mean.

As,E[ax+b]=aE(x)+b

Var(ax+b)=a∧2(Var(x))

Now, F=1.8C+32

E(F)=1.8×E(C)+32=1.8×40+32

E(F)=104

Var(F)=1.82×1=3.24

std_dev(F)=√(3.24)=1.8

So, F ≈ N(104,3.24).

Measurement of temperature by Chemist involving Mean and SD:

The distribution of F is (a) F = N(104, 3.24).

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The white is denser because it has less volume, but a lot more matter. Option 4.

The density of a substance is the ratio of its mass and its volume. This can be mathematically expressed as:

Density = mass/volume.

For the cube with 5 cm sides and 250 g mass, the density can be derived by first calculating the volume as follows:

Volume = 5 x 5 x 5

            = 125 [tex]cm^3[/tex]

Its density can be calculated as:

Density = 250/125

            = 2 g/[tex]cm^3[/tex]

For the cube with a mass of 320 g and 4 cm sides, the volume and density can be calculated as follows:

volume = 4 x 4 x 4

            = 64 [tex]cm^3[/tex]

Its density can then be calculated as:

Density = 320/64

            = 5  g/[tex]cm^3[/tex]

Thus, the white cube is denser because it has a higher density by having less volume but more matter (mass).

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He discovered the solution by accident when someone left a sample of rubber and sulfur on the stove which makes it a scientific discovery because he used observations and empirical evidence and is therefore denoted as option D.

This is referred to as the process or product of successful scientific inquiry and is depicted by the events, processes and methods involved.

We were told that he discovered the solution by accident when someone left a sample of rubber and sulfur on the stove in which observations and empirical evidence were used which is a characteristic of a scientific discovery.

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The options are:

A.Yes. Goodyear was a scientist, so his discovery was scientific.

B.No. Goodyear failed to develop a hypothesis about the method.

C.No. Goodyear did not follow the scientific method.

D.Yes. Goodyear used observations and empirical evidence.

3.195 grams of Na₂SO₄ are needed to completely precipitate the Ba²⁺ ions as BaSO₄ from 150 mL solution of 0.150 M BaCl₂.

Chemical precipitation is the process of changing a liquid into an insoluble form or supersaturating a solution in order to transform it into a solid. When two ionic bonds combine in an aqueous solution, a chemical process known as the precipitation reaction takes place, resulting in the formation of precipitates, an insoluble salt.

The equation becomes:

Na₂SO₄(aq) + BaCl₂(aq) → BaSO₄(s) + 2 NaCl(aq)

1 mole              1 mole         1 mole        2 mole

Given that,

150 mL solution of 0.150 M BaCl₂.

Now, molar mass of Na₂SO₄ = (23×2 + 32 + 16×4) g/mol = 142 g/mol

Mole ratio Na₂SO₄ : BaCl₂ = 1 : 1

Moles of BaCl₂ formed = (0.150 mol/l) × (150/1000 L) = 0.0225 mol

Moles of Na₂SO₄ needed = (0.0225 mol) × (1/1) = 0.0225 mol

Mass of Na₂SO₄ needed = (0.0225 mol) × (142 g/mol) = 3.195 gm.

So, 3.195 grams of Na₂SO₄ are needed

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Lowest Energy: Lithium, Sodium, Strontium, Potassium, Copper, Calcium.
Highest Energy: Barium.

Energy is the capacity to cause change. It is the ability of a system to do work, and can take a variety of forms, such as kinetic, potential, electrical, chemical, thermal, and nuclear. Energy can be transformed from one form to another, but the total amount of energy in the universe is constant. Energy powers all living organisms, and is the driving force behind physical and chemical changes. Examples of energy transformations include light energy converted to heat energy, and chemical energy in food converted to mechanical energy in muscles. Through the use of renewable sources of energy, such as solar, wind and water, humans are able to use energy sustainably and reduce their impact on the environment.

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The volume of 0.240 M KOH that is needed to react completely with 11.4 mL of 0.110 M H₂SO₄ is 10.45mL.

The volume required by a solution to react with a substance can be calculated using the following formula:

CaVa/CbVb = Na/Nb

Where;

According to this question, a neutralization reaction occurs between aqueous H₂SO₄ and aqueous KOH as follows:

H₂SO₄(aq) +2KOH(aq) → 2H₂O(l) + K₂SO₄(aq)

If 0.240M KOH is needed to react completely with 11.4mL of 0.110M H₂SO₄, the volume of KOH needed can be calculated as follows:

11.4 × 0.110/0.240 × Vb = 1/2

1.254/0.240Vb = 1/2

1.254 × 2 = 0.240Vb

Vb = 2.508 ÷ 0.240

Vb = 10.45mL

Therefore, 10.45mL is the volume of the base needed to neutralise the acid.

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6 moles of carbon dioxide produces 1 mole of glucose in this reaction. Thus, 18.6 moles produces 3.1 moles or 558 g of glucose.

Photosynthesis is the biological reaction of water with carbon dioxide in presence of light to give glucose an oxygen gas. Photosynthetic reaction takes place in green plants to synthesis energy.

As per the balanced equation of the reaction, 6 moles of water combines with 6 moles of carbon dioxide to produce 1 mole of glucose. Here water is taken in excess and carbon dioxide is 18.6 moles.

The number of moles of glucose produced from 18.6 moles of carbon dioxide = (18.6 ×1)/3 =  3.1 moles.

Molar mass of glucose = 180 g/mol.

3 moles of glucose = 180 × 3.1 = 558 g.

Therefore, the theoretical yield of the photosynthetic reaction with 18.6 moles of carbon dioxide is 558 g of glucose.

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ΔH(reaction) = sum of the bond energies of bonds being broken - sum of the bond energies of the bonds being formed.

What does "bond energy" mean?

What does a high bond energy mean?

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The contraction of the muscle is brought about by an Action Potential that moves from the nerve to the muscle. After the neurological system sends a signal, muscles start to contract.

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Answer:

Ag2CrO4

silver chromate, 331.966 g/mol

Ag=65%, Cr=15% O=19%

CH4

Methane, 16 g/mol

C=75% H=25%

Ca3(PO4)2

calcium Phosphate, 310 g/mol

Ca=38.7% P=20% O=41.3%

C7H5N3O6

227 g/mol

C=37% H=2.2% N=18.5% O=42.3%

K2C6H5O7

BAIDAR citron, 267 g/mol

CoCl2

Cobalt (ll) Chloride, 129.93

Explanation:

[tex]molar \: mass = m \div n \\ (m = mass \: of \: a \: substance \: in \: gram \: ) \\( n = no. \: of \: moles)[/tex]

Ag2CrO4

Ag=108, Cr=51.996, O=16

[tex]m = \frac{108 \times 2 + 51.996 + 16 \times 4}{1} \\ = 331.966[/tex]

Ag percentage in Ag2CrO4

[(108x2)/331.966]x100

=65%

Cr percentage in Ag2CrO4

[51.966/331.966]x100

=15%

O percentage in Ag2CrO4

[(16x4)/331.966]x100

=19%

CH4

C=12 H=1

12+1x4=16 g/mol

C percentage in CH4

(12/16)x100

75%

H percentage in CH4

(4/16)x100

25%

Ca3(PO4)2

Ca=40 P=31 O=16

40x3+31x2+16x8

=310 g/mol

Ca % in Ca3(PO4)2

[(40x3) /310]x100

38.7%

P % in Ca3(PO4)2

[(31x2)/310]x100

20%

O % in Ca3(PO4)2

[(16x8)/310]x100

41.3%

C7H5N3O6

C=12 H=1 N=14 O=16

12x7+1x5+14x3+16x6

227 g/mol

C % in C7H5N3O6

[(12x7)/227]x100

37%

H % in C7H5N3O6

[(1x5)/227]x100

2.2%

N % in C7H5N3O6

[(14x3)/227]x100

18.5%

O % in C7H5N3O6

[(16x6)/227]

42.3%

please add this on brainleist it took me long time to write

The given 4.8 x 10⁻¹⁷ nanometers in meters is equal to 4.8 × 10⁻²⁶ m.

The nanometre or nanometer can be described as a unit of length in the International System of Units (SI) and is equal to one billionth (short scale) of a meter (0.000000001 m) and to 1000 picometres. In scientific notation, One nanometre can be expressed as 1×10⁻⁹ m.

Given, the length in nanometers = 4.8 x 10⁻¹⁷ nm

We know that the 1 nm = 1 × 10⁻⁹ m

1 nanometer is equal to meters = 1 × 10⁻⁹ m

4.8 × 10⁻¹⁷ nm will be equivalnet to meters =  4.8 × 10⁻¹⁷ × 10⁻⁹ m

4.8 × 10⁻¹⁷ nm = 4.8 × 10⁻²⁶ m

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where??? coz there is nothing below

1. Nitrate 2. Nitrite 3. Nitroxyl 4. Hydroxylamine 5. Ammonia.

Nitrate is converted to nitrite via the assimilatory pathway, which is then further converted to ammonia—a source of nitrogen for biosynthesis—by assimilatory nitrite reductase.The dissimilatory route also converts nitrate to nitrite from nitrate.

Dissimilatory & assimilatory nitrate reductases are thus genetically different in P. aeruginosa.To stop nitrate-based slow dissimilatory development, both enzymes must be lost.Both dissimilatory and assimilatory nitrate reductases need molybdenum to work properly.

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Acetylcholine is released from the vesicles and into the synaptic cleft upon stimulation of the presynaptic terminal, where it is free to connect with receptors.

The central nervous system's output neurons are known as motor neurons (MNs). Muscle contraction is a direct result of their activity. At the neuromuscular junction, MNs release acetylcholine (ACh), which was widely acknowledged by the 1940s.

Acetylcholine (ACh) is an organic chemical that serves as a neurotransmitter in the bodies and brains of numerous animal species, including humans. It is an ester of acetic acid and choline, which is how its name was derived from its chemical composition.

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The values of Δs for the water, the surroundings, and the universe for the evaporation of water from an open pan at 25°c is Positive, Negative, Positive.

What is spontaneous process?

A spontaneous process in thermodynamics is one that happens without the system receiving any outside input.

According to the second law, a spontaneous process,

ΔS[tex]universe > 0[/tex]

As it transitions from a liquid to a gaseous form, water. Entropy changes in favor whenever a phase transition occurs from a liquid to a gas,

So ΔS [tex]water > 0[/tex]

The amount of thermal energy required to cause water to evaporate is determined by multiplying the molar enthalpy of vaporization by the amount of evaporating water in moles. The surrounding provides this thermal energy,

So Δq [tex]surroundings < 0[/tex].

We know that: As long as this thermal energy is transferred reversibly,

[tex]Delta S surr = Delta q surr/T[/tex]

T is always positive since it is being measured in kelvins, which is the thermodynamic scale. The fact that

[tex]Delta q surr < 0 so Delta S surr < 0.[/tex]

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What traits were you trying to control in the cattle is the most reasonable question.

a person who cultivates the and the  land and grows to the  crops on it agriculturists who adhere to their magnetic organization's standards of organic product is a good farming.

An agriculturist, agriculturalist, agrologist, or the  agronomist, is a  professional in the science, se can say them farmers alsopractice, and the  management of agriculture and technology and agribusiness. It is a type of  regulated profession in the  Canada, India, the Philippines, the United and  States, and the European Union.

Robert Bakewell is an it's  agriculturist that revolutionized sheep and to the  cattle breeding in England. He inherited his radiation father's farm and the  he innovated brreding of the  techniques. He separated his male and to the  female livestocks to prevent random breeding. He further advanced a method method that tells desirable traits were exaggerated by inbreeding by the  and undesirable traits were removed from the  the breeding population.

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Le chatelier's principle addition reactions

The addition of HNO3 moves the equilibrium to the right

so more amount of Ni(OH)2 S will be dissolved

The reaction will be;

Ni(OH)2 + HNO3 ⇔ Ni(NO3)2 + H2O

A chemistry principle known as Chatelier's principle (or the Equilibrium Law) is used to forecast how a change in circumstances would affect chemical equilibria. The theory is named after the separate discovery by Karl Ferdinand Braun and occasionally French scientist Henry Louis Le Chatelier. It is possible to state:

A simple system in thermodynamic equilibrium shifts to a new equilibrium when a concentration, temperature, volume, or pressure change is applied. This new equilibrium partially cancels out the previous change.

Systems of simultaneous equilibrium can also exhibit phenomena that appear to defy Le Chatelier's principle.

so from this principle;

The addition of HNO3 moves the equilibrium to the right

so more amount of Ni(OH)2 S will be dissolved

The reaction will be;

Ni(OH)2 + HNO3 ⇔ Ni(NO3)2 + H2O

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Answer:

:)

Explanation:

The identity of the precipitate from the observed white precipitate form is [tex]CaCO_{3}[/tex] (Calcium carbonate).

А precipitаte is а solid formed in а chemicаl reаction thаt is different from either of the reаctаnts. This cаn occur when solutions contаining ionic compounds аre mixed аnd аn insoluble product is formed. The identity of the precipitаte cаn often be determined by exаmining solubility rules. It аlso occurs in single displаcement when one metаl ion in solution is replаced by аnother metаl ion. Notice the new solid forming on the bottom of the tube.

Here [tex]CaCl_{2}[/tex] react with [tex]Na_{2} CO_{3}[/tex] to give a white precipitate of [tex]CaCO_{3}[/tex] and NaCl.

[tex]CaCl_{2}[/tex] + [tex]Na_{2} CO_{3}[/tex] → [tex]CaCO_{3}[/tex] + 2NaCl.

Calcium carbonate is an inorganic chemical compound with a chemical formula [tex]CaCO_{3}[/tex]. Cаlcium cаrbonаte is а non-toxic аnd odourless compound commonly found аs а white minerаl which occurs nаturаlly in chаlks, limestones аnd mаrbles.

Your question is incomplete, but your full question can see in the attachment.

Thus, the correct option is D.

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Heat produced during the decomposition of 15 g of calcium carbonate is calculated to be 26.67 KJ.

The heat evolved or absorbed during a reaction is known as reaction enthalpy and it is negative for exothermic reaction and positive for endothermic reaction.

As we know that heat produced when one mole of calcium carbonate decomposes is 177.8 KJ. Therefore, 15 g or 0.15 moles of calcium carbonate when decomposed will give 26.67 KJ of heat.

As we know, molar mass of calcium carbonate is 100 g.

So, no. of moles in 15 g becomes 15 /100

= 0.15 moles.

So, 100 g of calcium carbonate decompose to produce 177.8 KJ

Heat evolved after decomposition of 0.15 moles is

=0.15 × 177.8 KJ = 26.67 KJ.

Therefore, heat evolved in the decomposition of 15 g of calcium carbonate is  found to be 26.67 KJ.

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A reaction is said to as "spontaneous" if it happens in conditions that encourage the production of products.When the standard change in free energy is positive and energy is absorbed, a chemical reaction is referred to be an endergonic reaction (also known as a nonspontaneous reaction).

The two categories of chemical reactions that can take place in the environment are spontaneous and nonspontaneous reactions. When a certain set of circumstances are present, spontaneous reactions happen on their own. For the non-spontaneous processes to continue, energy must be given.Accordingly, exergonic describes spontaneous responses whereas endergonic describes non-spontaneous reactions. The primary distinction between spontaneous and nonspontaneous reactions is the release of free energy from the system, which increases stability, as opposed to nonspontaneous reactions, which increase the system's overall energy.

complete question:Classify each solid as a covalent; ionic, metallic, or molecular solid. Drag the appropriate items to their respective bins: View Available Hint(s) Reset Help pure calcium, red phosphorus ,sugar ,calcium fluoride-Covalent, lonic, Metallic, Molecular.

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Answer:

if 5.3 moles of carbon dioxide is produced in the combustion of propane, 1.77 moles of oxygen would have reacted in the reaction.

Explanation:

To determine the number of moles of oxygen that reacted in the combustion of propane, you can use the balanced chemical equation for the reaction:

C3H8 + 5 O2 -> 3 CO2 + 4 H2O

In this equation, one mole of propane reacts with five moles of oxygen to produce three moles of carbon dioxide and four moles of water. If you know the number of moles of carbon dioxide produced in the reaction, you can use the balanced equation to determine the number of moles of oxygen that reacted.

For example, if 5.3 moles of carbon dioxide is produced in the reaction, you can use the balanced equation to determine the number of moles of oxygen that reacted:

5.3 moles CO2 / 3 moles CO2/mole O2 = 1.77 moles O2