describe a type of chemical indicator used each time on packagin toi identify instruments that have been processed

Answer:

14,250 years old.

Explanation:

First, multiply the two lifetimes. - 11,400.

Then, divide 5,700 in half for the 0.5 lifetime. - 2,850.

Lastly, add them all up. - 11,400 + 2,850 = 14,250 years old.

sorry if incorrect <3

thats what i understood XD

Answer:

23millilitres.......

Answer:

- Oxido de magnesio

Explanation:

Mg → magnesio

O → oxígeno

La unión del oxígeno (no metal) con un metal, forma el determinado óxido que se nombra como óxido de .... y el no metal.

En este caso, podemos deducir que el contenido del frasco es de óxido de magnesio, aunque viendo que hay un sólo átomo de oxígeno podemos llamarlo como monóxido de magnesio, similar al CO (monóxido de carbono).

A partir de que el magnesio sólido entre en contacto con el aire, se produce MgO de acuerdo a la siguiente reacción:

2Mg  +  O₂ →  2MgO

NaCI is ionic and empirical

To determine the stability of the given closed-loop transfer functions, we need to analyze the locations of the poles in the complex plane. If all the poles have negative real parts, the system is stable.

If any pole has a positive real part, the system is unstable. If there are poles on the imaginary axis or have zero real parts, further analysis is required.

a) Transfer function: 8Kc / (5S + 1)

The pole of this transfer function is at S = -1/5. Since the real part of the pole is negative, the system is stable.

b) Transfer function: 8Kc / (S^2 + 3S + 2)

The poles of this transfer function are at S = -1 and S = -2. Both poles have negative real parts, so the system is stable.

c) Transfer function: 8Kc / (S^3 + 6S^2 + 12S + 8 + 8Kc)

To determine the stability of this transfer function, we need to find the roots of the polynomial in the denominator. The characteristic equation is S^3 + 6S^2 + 12S + 8 + 8Kc = 0.

By analyzing the roots of the characteristic equation for different values of Kc, we can determine the stability. If all the roots have negative real parts for any value of Kc, the system is stable.

However, without a specific value for Kc provided, we cannot conclusively determine the stability of the system. The stability of the system will depend on the specific value of Kc and the locations of the roots of the characteristic equation. Further analysis is required to determine the stability.

In summary:

a) The system is stable.

b) The system is stable.

c) The stability requires further analysis as it depends on the specific value of Kc and the locations of the roots of the characteristic equation.

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Answer:

the answer is c I took the test

1.  Consider the reaction: 5 A + 3 B → 2 C The rate of the reaction is found to be 0.0486 M/s. Then, The rate of change of B is 0.01215 M/min.

2.  For the following zero order reaction, the rate constant is 0.0311.

If [A₀] = 8.68, calculate [A] at 2.9 seconds. Then, [A] = 8.66445 ≈ 8.7.

(1) For Reaction : 5A + 3B → 2C

R₁ : 0.080486 M/s = K[A][B]²          ---------------------- (1)

When half of the B has reacted, then,

⇒ R₂ = k[A][B/2]                   -------------------------- (2)

Dividing (2) and (1), we get:

   R₂÷ R₁ = K[A] [B/2] ÷ K[A] /[B]

⇒  R₂÷ R₁ = B²/4 ÷ B²

⇒ R₂÷ R₁ = 1/4

Therefore,

R₁ /4 = 0.0486/ 4

        = 0.01215 M/minute.

Therefore,

Consider the reaction: 5 A + 3 B → 2 C The rate of the reaction is found to be 0.0486 M/s. Then, The rate of change of B is 0.01215 M/min.

(2) For a Zero Order reaction:

t = K[A₀] [A] ÷ K               ------------------------- (1)

Given that:

t = 2.9 Second

and, k = 0.0311

Converting Seconds into minutes:

t = 2.9 second = 0.048 Minutes ≈ 0.5 Minutes.

Putting the values in equation (1)

⇒ 0.5 = 8.68 - [A] ÷ 0.0311

⇒ 0.5 × 0.0311 = 8.68 - [A]

⇒ 0.01565 - 8.68 = - [A]

⇒ [A] = 8.66445

Therefore, [A] = 8.66445 ≈ 8.7

Based on the zero order reaction, the rate constant is 0.0311. If [A]0 = 8.68, calculate [A] at 2.9 seconds. Then, [A] = 8.7

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Answer:

please send the picture otherwise we won't be able to answer

Answer:

Explanation:

Before we jump into it, I just want to point out that a microwave oven has two

power ratings.  One is the amount of electrical power it takes from the wall outlet to do its job. The other is the "cooking power" it delivers into the chamber in the form of microwave radiation to heat the meatloaf.  The utility power required from the wall outlet is always more than the cooking power radiated into the chamber.

But we didn't really need to go into all that in order to answer the question.

1 watt = 1 joule per second

1 minute = 60 seconds

(850 watts) x (1 (joule/sec) / watt) x (60sec/min) x (6 minutes) = 306,000 joules  

A molecule having four total electron groups around the central atom has three bonding electron groups and one nonbonding electron group. Its molecular structure is trigonal pyramidal.

One or more atoms are joined by covalent (chemical) bonds to form molecules. Atoms can be represented as circles with a nucleus at their center (consisting of protons and neutrons) and one or more concentric circles around them, which represent the "shells" or "levels" in which the electrons surrounding the atom's nucleus are located, along with markings indicating the electron at each level. The lowest unit into which a substance can be divided while still being the same substance is a molecule. It is composed of two or more atoms that are chemically bonded to one another.

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Answer:

plz I. need a brainliest

Explanation:

I hope you have a good day

The correct ranking of compounds in order of increasing keq for this equilibrium is Acetone < Propanone < Benzaldehyde.

The correct ranking of compounds in order of increasing keq for the equilibrium of each of the carbonyl compounds with HCN to produce cyanohydrins is

Acetone < Propanone < Benzaldehyde.

In the above reaction, the cyanide ion acts as a nucleophile and attacks the carbonyl carbon atom in the carbonyl compound to form an intermediate compound. Then the intermediate compound formed by the reaction between HCN and the carbonyl compound undergoes an intramolecular rearrangement to form cyanohydrin.Based on the stability of intermediate compound formed, the order of increasing stability is as follows:

Acetone < Propanone < Benzaldehyde.

Since the keq is directly proportional to the stability of the intermediate, the order of increasing keq for the equilibrium of each of the carbonyl compounds with HCN to produce cyanohydrins is

Acetone < Propanone < Benzaldehyde.

The correct ranking of compounds in order of increasing keq for this equilibrium is

Acetone < Propanone < Benzaldehyde.

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Answer:

% purity of limestone = 96.53%

Explanation:

Question (4).

Weight of impure CaCO₃ = 25.9 g

Molecular weight of CaCO₃ = 40 + 12 + 3(16)

                                              = 100 g per mole

We know at S.T.P. number of moles of CO₂ = 1 and volume = 22.4 liters

From the given reaction, 1 mole of CaCO₃ reacts with 1 mole or 22.4 liters of

CO₂.

∵ 22.4 liters of CO₂ was produced from CaCO3 = 100 g

∴ 1 liter of CO₂ will be produced by CaCO₃ = \(\frac{100}{22.4}\)

∴ 5.6 liters of CO₂ will be produced by CaCO₃ = \(\frac{100\times 5.6}{22.4}\)

                                                                              = 25 g

Therefore, % purity of CaCO₃ = \(\frac{\text{Weight calculated}}{{\text{Weight given}}}\times 100\)

                                                 = \(\frac{25}{25.9}\times 100\)

                                                 = 96.53 %

Answer:

Mechanical waves are waves that must go through a medium in order to propagate. Mechanical waves can also be transmitted through solids, so the medium doesn't have to be a gas or a liquid.

Explanation:

Hope this helps! Brainliest would be appreciated. :)

The oxidation of the iron ions in the hemoglobin molecule to the ferric state (Fe³⁺) results in the loss of the molecule's ability to bind and transport oxygen.

This oxidation process alters the structure of hemoglobin, rendering it less effective in its primary function of carrying oxygen to body tissues.

Hemoglobin is a protein found in red blood cells that is responsible for transporting oxygen from the lungs to tissues throughout the body. It contains iron ions (Fe²⁺) that bind to oxygen molecules, forming a reversible complex known as oxyhemoglobin. This complex is crucial for oxygen transport.

However, when the iron ions in hemoglobin undergo oxidation to the ferric state (Fe³⁺), the binding affinity for oxygen decreases significantly. The oxidation can be caused by factors such as exposure to certain chemicals or reactive oxygen species. As a result, the oxidized hemoglobin is unable to efficiently bind oxygen, impairing its oxygen-carrying capacity and potentially leading to reduced oxygen delivery to tissues.

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Answer: The specific heat capacity of the unknown metal given is \(0.466 J/g^{o}C\).

Explanation:

Given: Mass = 225 g

Change in temperature = \(13^{o}C\)

Heat energy = 1363 J

The formula used to calculate specific heat is as follows.

\(q = m \times C \times \Delta T\)

where,

q = heat energy

m = mass of substance

C = specific heat

\(\Delta T\) = change in temperature

Substitute the values into above formula as follows.

\(q = m \times C \times \Delta T\\1363 J = 225 g \times C \times 13^{o}C\\C = \frac{1363 J}{225 g \times 13^{o}C}\\= 0.466 J/g^{o}C\)

Thus, we can conclude that the specific heat capacity of the unknown metal given is \(0.466 J/g^{o}C\).

In order to calculate the mass of carbon dioxide formed during the combustion of acetone, we need to balance the chemical equation first. Combustion of acetone takes place in the presence of oxygen gas to produce carbon dioxide and water.

The balanced chemical equation is given as:2C3H6O + 9O2 → 6CO2 + 6H2OFrom the equation, we can see that for every 2 moles of acetone burned, 6 moles of carbon dioxide are produced. Now, we need to calculate the number of moles of acetone present in 78.7 g.

To do this, we divide the mass of acetone by its molar mass: Molar mass of acetone (C3H6O) = 3 x 12.01 + 6 x 1.01 + 16.00 = 58.08 g/mol Number of moles of acetone = mass / molar mass = 78.7 / 58.08 = 1.354 moles Now that we know the number of moles of acetone, we can calculate the moles of carbon dioxide formed.

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Answer:

Last one

Explanation:

You may can't imagine that there are singke celled organisms are much more than all animals.

There amount is in 500-700trillions so last option is wrong

Answer:

D

Explanation:

Answer:

NaOH+HF-------NaF+H2O

1 mole Of HF=1mole of NaF

3mole HF= X

X=3mole of NaF

Answer:

paired electrons is magnetic configuration

D is the answer so now we can understand

Answer:

to my understanding D iz da answer

Explanation:

let hope dat it will help u

Answer:

it changes from potential to kinetic

Explanation:

the coals are at rest and when a force acts upon it which makes it move from one position to another

Answer:

[OH⁻] = 3.34x10⁻³M; Percent ionization = 0.54%; pH = 11.52

Explanation:

Kb of the reaction:

NH3 + H2O(l) ⇄ NH4+ + OH-

Is:

Kb = 1.8x10⁻⁵ = [NH₄⁺] [OH⁻] / [NH₃]

As all NH₄⁺ and OH⁻ comes from the same source we can write:

[NH₄⁺] = [OH⁻] = X

And as [NH₃] = 0.619M

1.8x10⁻⁵ = [X] [X] / [0.619M]

1.11x10⁻⁵ = X²

3.34x10⁻³ = X = [NH₄⁺] = [OH⁻]

% ionization:

[NH₄⁺] / [NH₃] * 100 = 3.34x10⁻³M / 0.619M * 100 = 0.54%

pH:

As pOH = -log [OH-]

pOH = 2.48

pH = 14 - pOH

The total time required for the decay is approximately 1416.0 hours, which is closest to the given option C. 1006.9 hours.

Option (C) is correct.

To calculate the number of half-lives required for the decay. The half-life of 140 Ba is given as 283.2 hours.

First, we calculate the fraction of the original amount remaining after each half-life. Since the half-life represents the time it takes for half of the substance to decay, the fraction remaining after each half-life is 1/2.

To find the number of half-lives required to decay from 35 mg to 1.0 mg, we can set up the following equation:

(35 mg) * (1/2)ⁿ = 1.0 mg

Where 'n' is the number of half-lives.

Now, let's solve for 'n':

(1/2)ⁿ = 1.0 mg / 35 mg

(1/2)ⁿ = 0.02857

To find 'n', we can take the logarithm (base 1/2) of both sides:

n = log base 1/2 (0.02857)

Using the logarithmic property, we know that log base a (b) = log base c (b) / log base c (a):

n = log (0.02857) / log (1/2)

Using a calculator, we can find:

n ≈ 4.243

Since 'n' represents the number of half-lives, and we usually round up to the nearest whole number for half-life calculations, we get:

n ≈ 5

Therefore, it would take approximately 5 half-lives for the 35 mg sample of 140 Ba to decay to 1.0 mg.

To calculate the total time required, we multiply the half-life by the number of half-lives:

Total time = 283.2 hours * 5

Total time ≈ 1416 hours

Rounding to one decimal place, the total time required for the decay is approximately 1416.0 hours, which is closest to the given option C. 1006.9 hours.

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Answer:

Biochemistry is the discipline that studies the chemistry of life, and its objective is to explain form and function based on chemical principles. Organic chemistry is the discipline devoted to the study of carbon-based chemistry, which is the foundation for the study of biomolecules and the discipline of biochemistry. Both biochemistry and organic chemistry are based on the concepts of general chemistry, some of which are presented in Fundamentals of Physics and Chemistry Important to Microbiology.

Explanation:

Answer:

Claim 1- The evidence that supports my claim because Evidence Card b says “One man got sick, but his two children did not. He used water from Whip River. He used  the cube to heat the first pitcher of water, which he gave to his kids, and then reused the  cube without reheating for the second pitcher, which he drank himself.”    My first piece of evidence is that if you don't follow thee directions then something bad would happen

Explanation:

Answer:

it contains 2.56 x 10^15.

Explanation:

given no. of moles = 4.26 x 10^-9 atoms

one mole has 6.022 x 10^23 atoms

so it contains 4.26 x 10^-9 x 6.022 x 10^23 atoms

(If we suppose silver's atomic weight as 108.)