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What is the melting point of this substance at 1 ATM of pressure?

The probability that a person has tuberculosis given a negative DNA indication is approximately 0.0005 or 0.05%.

To find the probability that a person has tuberculosis given a negative DNA indication, we can use Bayes' theorem. Bayes' theorem states that the probability of an event A given event B can be calculated using the formula: P(A|B) = (P(B|A) * P(A)) / P(B)

In this case, we want to find P(T|N), the probability of having tuberculosis given a negative DNA indication.

We are given the following information:

P(T) = Probability of having tuberculosis = 0.01 (given)

P(N) = Probability of a negative DNA indication (to be calculated)

To calculate P(N), we can use the complement rule:

P(N) = 1 - P(T) = 1 - 0.01 = 0.99

Now, we can plug the values into Bayes' theorem:

P(T|N) = (P(N|T) * P(T)) / P(N)

P(T|N) = (0.05 * 0.01) / 0.99

P(T|N) ≈ 0.0005

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The density of the metal is 2.7 g/cm³, which can be used to identify the metal since different elements have different densities.

The given mass of the metal is 27g and its volume is 10 cm³.

The identity of the metal can be found out by using the formula of density, which is Density = Mass/Volume.

Density is a physical property of matter that is the amount of mass per unit volume. By rearranging the formula of density, we can determine the identity of the metal by finding its density which is given by mass divided by volume.

Identity of a metal that has a mass of 27g and a volume of 10 cm³ can be determined by using the formula of density which is Density = Mass/Volume.  

Here is the solution:Given,Mass of the metal = 27gVolume of the metal = 10 cm³

Density of the metal is given by the formula:Density = Mass/Volume

Substituting the given values in the formula:Density = 27g/10 cm³ = 2.7 g/cm³

The periodic table can be used to match the density with known elements and thus determine the identity of the metal.

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Answer:

chemical properties

Explanation:

chemical properties did change the composition of substance, so it cannot go back to original anymore, such as burning, rusting, etc.

I took the test before. I got all the answer correct and got 100% score.

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Learning Properties of Matter Quiz Unit 2 Lesson 11 Grade 8

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A claim about the arrangements of electrons and properties within a family of elements is described below:

Families of elements refer to elements that are found in the same group in the periodic table.

Elements that belong to the same family have the same arrangement of electrons.

The families of elements are found in the vertical columns knowns as groups. They have the same physical properties because they have the same number of e; electrons in their outermost shell.

For example, elements belonging to group 1 have one valence electron and show similarity in their chemical properties.

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In a chemical equilibrium, the concentration of reactants and products remains constant over time, resulting in a constant rate of forward and backward reactions. It is a state of a reaction system in which the forward and backward reactions are occurring at the same rate.

When a gas is heated, it expands. As a result, if a chemical reaction is endothermic, the rate of the forward reaction will increase. Here's how to calculate the new partial pressures after equilibrium is reestablished:

(1) If the temperature is decreased, the reaction will shift toward the exothermic direction, and the pressure will increase.

(2) The reaction will shift towards the endothermic direction if the temperature is increased, and the pressure will decrease.

(3) The pressure will decrease if the number of gas molecules on the right side of the equation decreases, and it will increase if the number of gas molecules on the right side of the equation increases.(4) If the reaction is shifted in the direction of the side with fewer moles, the pressure will decrease, and if it is shifted in the direction of the side with more moles, the pressure will increase.

Example: CO (g) + 2 H2 (g) ⇌ CH3OH (g) + heat

At equilibrium, the partial pressures of CO, H2, and CH3OH are 0.25 atm, 0.32 atm, and 0.35 atm, respectively.

Solution: To determine the new partial pressures of the reactants and products, we must first determine the direction in which the reaction will shift. We know that the reaction is exothermic since it produces heat. When the temperature is lowered, the reaction will shift in the direction of heat, or in this case, the direction of the reactants. As a result, the reaction will shift to the left, and the partial pressure of CO and H2 will increase while the partial pressure of CH3OH will decrease.

Partial Pressure of CO=Initial partial pressure × moles of gas products at equilibrium moles of gas reactants + moles of gas products Partial Pressure of CO=0.25 atm × 1 mol0+1+2Partial Pressure of CO=0.083 atm

Partial Pressure of H2=Initial partial pressure × moles of gas products at equilibrium moles of gas reactants + moles of gas products

Partial Pressure of H2=0.32 atm × 3 mol0+1+2Partial Pressure of H2=0.267 atm

Partial Pressure of CH3OH=Initial partial pressure×moles of gas products at equilibrium moles of gas reactants+moles of gas productsPartial Pressure of CH3OH=0.35 atm × 1 mol1+0+1Partial Pressure of CH3OH=0.175 atm

After equilibrium is reestablished, the new partial pressures of CO, H2, and CH3OH are 0.083 atm, 0.267 atm, and 0.175 atm, respectively.

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Answer:

this isn't correct answer but the equation is correct by using this methid you can got your answer .

Explanation:

Given - Mass number of atom = 23

                                Atomic number of atom = 11

As, no. of electrons in an atom is equal to an atomic number of the element.

So, number of electrons = 11

Secondly , number of protons are equal to number of electrons.

so, number of protons = 11

And number of neutrons = mass number - atomic number = 23−11 = 12

so, number of neutrons = 12

So , the atom contains 11 protons, 11 electrons, 12 neutrons.

The student makes the correct tile selection, but the units must be cancelled by flipping the tile. Considering that 13.75 mol of silver nitrate was required to produce 6.75 mol of cupric nitrate (option B)

The reaction's chemical formula has been:

2AgNO₃ (aq) + Cu (s) + 2Ag (s) + Cu(NO₃)₂ (aq)

The balanced chemical equation indicates that 2 moles of silver chloride were needed to make 1 mole of cupric nitrate.

6.75 moles of cupric nitrate have been made from the following amount of silver nitrate:

2 moles of silver nitrate = 1 mole of cupric nitrate.

Hence,

6.75 x 2 silver nitrate = 6.75 moles of cupric nitrate.

So,

13.75 moles of silver nitrate = 6.75 moles of cupric nitrate.

In order to create 6.75 mol of cupric nitrate, 13.75 mol of silver nitrate was required.

The student selects the appropriate tile to determine the answer to the issue, but the tile needs to be turned around to undo the units. So, option B is the right one.

The question is incomplete, it should be:

A student tried to solve the following problem by selecting the tile as shown. What, if anything, did the student do wrong?

2AgNO3 (aq) + Cu (s) + 2Ag (s) + Cu(NO3)2 (aq)

How many moles of silver nitrate (AgNO3) are

needed to produce 6.75 moles of copper (II) nitrate

(Cu(NO3)2) upon reacting with excess copper (Cu)?

6.75 mol Cu(NO3)₂

1 mol Cu(NO3)₂

2 mol AgNO₃

A. The student chose the wrong tile to solve the problem

B. The student chose the correct tile, but needs to flip the tile to make the units cancel

C. The student chose the correct tile, but needs to add a second tile to finish the solution.

D. There is nothing wrong. The problem is ready to be solved.

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Although the student picks the right tile, the units still need to be cancelled by turning the tile. Given that 6.75 mol of cupric nitrate requires the production of 13.75 mol of silver nitrate (option B)

The chemical equation for the reaction has been:

\(2AgNO₃ (aq) + Cu (s) + 2Ag (s) + Cu(NO₃)₂ (aq)\)

According to the chemical equation, 2 moles of silver chloride were required to produce 1 mole of cupric nitrate.

The following quantity of silver nitrate has been converted into 6.75 moles of cupric nitrate:

1 mole of cupric nitrate is equal to 2 moles of silver nitrate.

Hence,

6.75 moles of cupric nitrate are equal to 6.75 × 2 silver nitrate.

So,

6.75 moles of cupric nitrate are equal to 13.75 moles of silver nitrate.

13.75 mol of silver nitrate were needed to produce 6.75 mol of cupric nitrate.

The learner chooses the proper tile to find the solution to the problem, however the units must be undone by turning the tile around. Hence, choice B is the best one.

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Complete Question is:

A student tried to solve the following problem by selecting the tile as shown. What, if anything, did the student do wrong?

\(2AgNO3 (aq) + Cu (s) + 2Ag (s) + Cu(NO3)2 (aq)\)

How many moles of silver nitrate (AgNO3) are

needed to produce 6.75 moles of copper (II) nitrate

\((Cu(NO3)2)\) upon reacting with excess copper (Cu)?

6.75 mol Cu(NO3)₂

1 mol Cu(NO3)₂

2 mol AgNO₃

A. The student chose the wrong tile to solve the problem

B. The student chose the correct tile, but needs to flip the tile to make the units cancel

C. The student chose the correct tile, but needs to add a second tile to finish the solution.

D. There is nothing wrong. The problem is ready to be solved.

Answer:

Only daughter atoms remain

Hopefully this helps

Answer:

Hey there!

At the end of a decay reaction, Energy particles and rays remain

Explanation:

These energy particles are;

• alpha particles

• beta particles

• gamma rays

\(.\)

Answer:

organesson

Explanation:

the element 118th symbol Og

Answer:Dmitri Mendeleev

Explanation:

In 1869, Russian chemist Dmitri Mendeleev created the framework that became the modern periodic table, leaving gaps for elements that were yet to be discovered. While arranging the elements according to their atomic weight, if he found that they did not fit into the group he would rearrange them.

Answer:

D. \( O^{2-}\)

Explanation:

In Chemistry, electrons can be defined as subatomic particles that are negatively charged and as such has a magnitude of -1.

Valence electrons can be defined as the number of electrons present in the outermost shell of an atom. Valence electrons are used to determine whether an atom or group of elements found in a periodic table can bond with others. Thus, this property is typically used to determine the chemical properties of elements.

Oxygen has a total number of eight (8) electrons and as such the \( O^{2-}\) is able to gain (receive) two (2) more electrons in order to have the same electron arrangements as the noble gas i.e an atom of neon that has a total number of ten (10) electrons.

Hence, \( O^{2-}\) contains the same number of electrons as an atom of neon.

Answer:

True

Explanation:

Answer:

Here's the answer pretty thang = 140 N

Explanation:

List Known Values-

35N

4M

Formula-

W=FJ

Substitution-

W= 3.5N (4m)

Answer & Units-

140 N

Bobby perform in pushing a 35 N crate a distance of 4 meters the work done by him is 140 joules per second.

The work is something which need energy to be done it can be any physical or chemical energy that can be calculated with the help of Newton law.

Work is calculated by multiplying the force required for the work  by the amount of movement of substance or object.

                    W = F × d   here, W = work

                                                  F = force

                                                  d = distance

Substituting the value in the formula,

                     W = 35 × 4  

                      W = 140 joules

Newton-meter is the same thing as a joule so the unit is joules.

Therefore, bobby perform in pushing a 35 N crate a distance of 4 meters the work done by him is 140 joules per second.

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Answer:

please make me brainalist and keep smiling dude I hope helped you

please thank all of my answer

Explanation:

The decreasing order of boiling points for the following liquids is H2O > NH3 > SO2 > CO2.

The reason for this order is the strength of intermolecular forces between the molecules of these liquids. In H2O, there are strong hydrogen bonds between the molecules which require more energy to break, resulting in a higher boiling point. NH3 also has hydrogen bonding, but it is not as strong as in H2O, resulting in a lower boiling point. SO2 has dipole-dipole interactions between its molecules, which are weaker than hydrogen bonding, resulting in a lower boiling point than NH3. Finally, CO2 only has weak London dispersion forces between its molecules, which are the weakest intermolecular forces, resulting in the lowest boiling point.
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\(density \: = \frac{mass}{volume} \)

mass = 12.3 × 25

= 307.5

approximately = 308 g

False. Both random and systematic errors can have an impact on experimental data.

Random mistakes are generated by unpredictability in measuring settings and are typical of minor magnitude. In contrast, systematic mistakes are generated by systematic biases in the experimental technique and result in a constant divergence from the correct value.

If Alejandro's results differ greatly from those of his neighbors, it could be due to chance, but it could also be due to systemic flaws in his experiment. Without more examination, Alejandro cannot assume that the variance is purely due to random mistakes. He should thoroughly examine his experimental approach for potential sources of systematic error. It may also be beneficial to repeat the experiment to establish whether the discrepancy is due to random error or if it is consistent.

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An atom's configuration based on its number of electrons ends at 3p. Another atom has seven more electrons. Starting at 3p, the remaining configuration is O3p445²3d5. Option C is correct answer.

The electron configuration of an element refers to the number of electrons in each of its atoms that are located in the shells around the atomic nucleus. Electrons in the same shell have similar energies; they are arranged in shells according to increasing energy levels.According to the question, the atom's configuration based on its number of electrons ends at 3p, and another atom has seven more electrons. Hence, the electron configuration of that atom should start with 3p since the question states starting at 3p. The remaining seven electrons should go into the 4s and 3d sub-shells. Therefore, the correct answer is:O3p445²3d5

The correct answer is C.

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Answer:see below

Explanation:

   :Cl:      :Br:

   ||       ||

H3C-Xe-CH3

   ||      

   :Br:      

In an endergonic reaction the phosphate group that is removed when atp is converted to adp, a reactant acquires it.

What is phosphate group?

A phosphate group is little more than a phosphorus atom bonded to four oxygen atoms, but despite this, it plays numerous significant roles. It is a component of nucleic acids like DNA and RNA, along with bases and sugars. It supplies energy for our muscles to move as a component of energy carriers like ATP.

Energy is released and ATP is changed into adenosine diphosphate when one phosphate group is removed by breaking a phosphoanhydride bond during a procedure known as hydrolysis (ADP).

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Answer:

a. .125 mol b. 7.25g

Explanation:

a. To get the moles multiply the volume by the molarity.

.5L*.25M=.125mol NaCl

b. The molar mass is provided so multiply the moles by the molar mass to get the amount of grams of nacl.

.125mol*58molar mass=7.25g nacl to make the solution

1. The half-life of the element is 22 years

2. The time taken for 308 g of the sample to decay to 4.8125 g is 132 years

Half-life is simply defined as the time taken for half of a material to decay.

From the diagram, the time for 22.5 g is 22 years.

Thus, the half-life of the element is 22 years

2ⁿ = N₀ / N

2ⁿ = 308 / 4.8125

2ⁿ = 64

2ⁿ = 2⁶

n = 6

t = n × t½

t = 6 × 22

t = 132 years

See attached photo for diagram

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1.Atomic Number (Z) = Mass Number (A) - Number of Neutrons

neutrons = mass number-atomic number

Atomic mass Cl-37= 17

Mass number Cl-37=37

Neutrons = 37-17=20

2. Mass atom X = mass isotope 1 . % + mass isotope 2.%...

\(\tt atomic~mass~X=0.0224\times 88+0.7832\times 90+0.1944\times 91=90.1\)

3. The energy in one photon can be formulated as

\(\large{\boxed{\bold{E\:=\:h\:.\:f}}}\)

f = c / λ, so :

\(\tt E\approx f\approx \dfrac{1}{\lambda}\)

Energy is directly proportional to frequency and inversely proportional to the wavelength

So, as the frequency of photon increases, the energy of photon increases

4. Based on answer number 3 :

A. The wavelength becomes longer, and the energy decreases

Non-ionic surfactant is chosen to modify the surface of glass if you want to minimize the absorption of proteins onto the surface.

Surfactants are amphiphilic molecules which have hydrophobic and hydrophilic parts. The hydrophobic tail is a hydrocarbon, fluorocarbon, or siloxane. Surfactants are generally categorized primarily based totally on their polar head because the hydrophobic tails are regularly similar. If the pinnacle organization has no charge, the surfactant is known as non-ionic. If the pinnacle organization has a terrible or nice charge, it's miles known as anionic or cationic, respectively. If it includes each nice and terrible groups, then the surfactant is known as zwitterionic. Nonionic surfactants then again are regularly used as wetting dealers and withinside the meals industry. Both cationic and zwitterionic surfactants are greater for unique use as they may be greater high priced to produce.

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Answer:

1. she requires the anode and cathode

3. the electrolyte : the increase amount of salty water she uses will determine the transfer in of electron needed to power the bulb

4. the battery she uses must be able to power a torch

5. the bulb could be a torch bulb or a bulb lesser than 25 watts

Considering the chemical and physical properties of elements, the elements can be arranged into groups in the periodic table as follows:

Group 1 to 3 - metals

Group 14 - non-metals, metalloids, and metals

Group 15 to 18 - non-metals

Groups of elements refer to vertical columns or families that contain elements with similar chemical properties.

Each group in the periodic table has distinct properties and trends. For example:

These are just a few examples of the groups in the periodic table, and each group exhibits unique chemical properties and trends.

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Answer:

No matter if you are on Earth, the moon or just chilling in space, your mass does not change. But your weight depends on the gravity force; you would weigh less on the moon than on Earth, and in space you would weigh almost nothing at all.

Answer:

Your mass doesn't change on other planets, but the gravity and size of those planets affect how much you weigh. So, your weight depends upon the gravity of the planet and your weight keeps changing based on planet gravity. Mass is both a property of a physical body and a measure of its resistance to acceleration when a net force is applied. An object's mass also determines the strength of its gravitational attraction to other bodies.

Explanation:

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