what mass of solute is required to produce 570.3 ml of a 0.191 m solution of kbr?

The balanced equation is 7IO³⁻ + 6Re + 3H₂O → 6ReO₄⁻ + 7I⁻ + 6H⁺

A balanced form of equation is one in which the number of atoms present in the reactants is exactly equal to the number of atoms in the product side. This follows the law of conservation of mass.

IO³⁻ (aq)+ Re(s) → ReO₄⁻(aq) + I⁻(aq)

The above reaction is not  balanced as the number of same atoms on the reactant side is not equal to the number of atom on the product side.

We will solve it by electron method

The balanced form of equation is

7IO³⁻ + 6Re + 3H₂O → 6ReO₄⁻ + 7I⁻ + 6H⁺

Here. the number of charge and atoms are equal on both sides.

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During a relaxer strand test, hair that is pressed to the scalp and continues to curl is d. insufficiently relaxed

During a relaxer strand test, hair that is pressed to the scalp and continues to curl is: d. insufficiently relaxed

This means that the relaxer has not fully straightened the hair, and additional processing time or adjustments may be needed to achieve the desired result. Always follow the manufacturer's instructions and monitor the hair closely to avoid damage.

Relaxer test. Application of the relaxer to a hair strand will indicate the reaction of the relaxer on the hair. Relaxers consist of three main components: an alkaline agent, an oil phase and a water phase.

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Answer:

The oxidation state of hydrogen is +1 in its compounds, except for metal hydrides, such as NaH, LiH, etc., in which the oxidation state for H is -1. The oxidation states of other elements are then assigned to make the algebraic sum of the oxidation states equal to the net charge on the molecule or ion.

The oxidation state of a lone element is that It is its most likely oxidation state, and it is the same as in a compound. The correct options are A and D.

The oxidation state or oxidation number is a hypothetical charge that is given to the elements when they lose or gain an electron. When elements combine, they form bonds with each other. When bonds are formed, the atoms share electrons with each other.

The element that gains electrons, get a negative charge, and the atom that donates electrons gain a positive charge. The number of charges increased as per electrons. The oxidation state of a lone element is most likely the oxidation state and the same as in a compound.

Thus, the correct options are A. It is its most likely oxidation state and D. It is the same as in a compound.

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Explanation:

For an effective use of a laboratory with protection and safety for all, there must be rules and policies that must be strictly disseminated and followed by anyone who uses a laboratory for a specific purpose, such as the use of specific clothes and goggles.

However, in the event of a small fire, the ideal is to notify the laboratory instructor, and exit the emergency exits in an orderly and quick manner.

If some materials ignite and cause a small fire you should c. pour water on it or use wet paper towels to put it out.

In the lab there are many guidelines and precautions that must be taken to ensure that things like fire do not happen but sometimes it cannot be helped.

If some materials like paper or paper-like materials ignite and cause a small fire you should put it out quickly by:

In conclusion, put the fire out as soon as possible using water or a small paper towel so that it doesn't spread.

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Options for this question include:

a. sound the building alarm and evacuate the area  

b. sound the building alarm and then use the fire extinguisher

c. pour water on it or use wet paper towels to put it out

d. run out of the room

Answer:

the noble gases

ANSWER Plasamas are good conductors of electricity and are affected bt magnetic fields

Answer:

1. an educated guess

2. data

3. what changes in experiment

4. what stays the same in both groups

5. the group where nothing changes, normal

6. group with independent variable, what's being tested

Answer:

occur if two of the ions form an insoluble ionic compound, which precipitates out of solution

Explanation:

When two ionic compounds are dissolved in water, a double replacement reaction takes place if two of the ions form an insoluble ionic compound, which precipitates out of solution. In double displacement reaction ions switch partners. And hence, produce an insoluble precipitate.

The correct answer is D. are made up of at least two substances

The option that give the characteristics of colloids in the question is that they are made up of at least two substances

Therefore, the last option among the given options is correct.

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Answer:

3.1x10^24 it will be in 1 kg of platinum

The pH of the solution is 10.0773

What is pH ?

a metric for determining how basic or acidic a substance or solution is. The pH scale ranges from 0 to 14. A pH value of 7 is considered neutral on this scale, meaning it is neither acidic nor basic. It is more acidic if the pH value is below 7, and more basic if the pH value is above 7.

before adding HCL,

moles of NH3 = M*V =1.80 M * 350 mL = 630 mmol

moles of NH4Cl = M*V = 0.25 M *350 mL = 630 mmol

moles of HCl added=  M*V = 1.30 M *170 mL = 221 mmol

2 mmol of NH3 will react with this HCl to form 2 mmol of NH4Cl

After reaction,

630mol of NH3 = 630 mmol - 2 mmol  =628 mmol

mol of NH4Cl = 630 mmol + 2 mmol  =632mmol

total volume = 350 mL + 170 mL = 520 mL

[NH3] = number of mol / volume

          = 628 mmol/520 mmol

          = 1.2 M

[NH4Cl] = number of mol / volume

          = 632 mmol/520 mmol

          = 1.215M

p K b = -log K b

        = -log (1.2*10^-4)

       =3.92

use:

pOH  =p K b  +  log {[NH4Cl]/[NH3]}

         =3.92 + log (0.632/0.628)

          =3.9227

pH = 14 - pOH

      = 14 - 3.9227

      =10.0773

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Explanation:

the equation must be

4NH3 + 5O2–> 4NO + 6H2O

Explanation:

we have,

force(f)=10,000N

mass(m)=500kg

now,

acceleration=f×m

=10,000×500

=5000000m/s²

'Sometimes when an organism ingests bad bacteria, the organism's body responds by vomiting, which is best explained for the body's reaction where A. The body responds by vomiting because it is trying to rid the body of the bad bacteria.

The physiological meaning of vomiting is associated with a natural response of the body to maintain the internal equilibrium conditions or homeostasis, which in this case helps to eliminate harmful bacteria.

Therefore, with this data, we can see that the physiological meaning of vomiting is associated with the removal of pathogens such as bacteria.

Complete question:

'Sometimes when an organism ingests bad bacteria, the organism's body responds by vomiting. Which of the following answer choices best explains the reason for the body's reaction?

The body responds by vomiting because it is trying to rid the body of the bad bacteria

The body responds by vomiting because the digestive juices that come up often times kill bacteria

The body responds by vomiting because it does not want the organism to keep eating the same food

The body responds by vomiting because the bacteria that are ingested causes the organism to vomit

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The number of particles of water that exist in a closed test tube after the water vaporizes and turns into a gas will be the same as the number of particles before the phase change.

This is because during the phase change, the molecules of water simply change their state from liquid to gas.the phase change from liquid to gas does not involve any change in the number of molecules, only a change in the physical state of the molecules.  The molecules do not disappear or gain additional molecules from outside the test tube. As such, the number of particles of water in the test tube after the phase change is the same as before the phase change.

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The key difference between free radical and ion is that the free radicals have one or more unpaired electron, but ions have paired electrons.

What is the Paired and Unpaired Electrons?

Unpaired electrons are the ones that appear in an orbital alone, while paired electrons are the ones that appear in an orbital as pairs in an atom. So, in the orbital, paired electrons always appear as two electrons, whereas unpaired electrons always appear as a single electron. The main distinction between paired and unpaired electrons is this. Additionally, whereas unpaired electrons result in paramagnetism or ferromagnetism in atoms, paired electrons cause diamagnetism in atoms.

A change in the orbital motion of electrons caused by an applied magnetic field induces diamagnetism, a very weak form of magnetism. This magnetism is transient and only endures when an outside field is present.

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The options can not be found on the internet so i will provide overview on the great basin desert below;

The Great Basin Desert is a vast arid region located in the western United States, covering parts of Nevada, Utah, California, Oregon, Idaho, and Wyoming. It is named after the Great Basin, a region of relatively flat land surrounded by mountain ranges that drain internally.

The Great Basin Desert is characterized by a high elevation and a semiarid climate with hot summers and cold winters. The average annual precipitation in the region is low, ranging from 5 to 15 inches, and is highly variable from year to year. The desert is dominated by sagebrush and other shrubs, and it is home to a variety of animals, including mule deer, pronghorn antelope, coyotes

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Answer:

When nitric acid reacts with ammonia, ammonium nitrate is formed.

Answer:

it's B.

Explanation:

Similar to Radio wave a microwave is also an electromagnetic wave of lower wavelength and high frequency.

Answer:

B

Explanation:

Answer:

MARK AS BRAINLIST

Explanation:

density = mass/volume

mass=25.3

density =10.5

10.5=25.3/v

v=25.3/10.5

=2.40

No, it does not pass the "fat pencil" test. Therefore, a normal distribution is not a reasonable model. Option B is the correct answer.

The "fat pencil" test is a quick visual check to determine if a dataset can be reasonably approximated by a normal distribution. In this case, the pH readings of wastewater show a significant deviation from a normal distribution. The presence of several low pH values (1.0) and a few high pH values (10.0, 10.5, 11.4) indicate a non-normal distribution with skewness and potential outliers. Therefore, it is not reasonable to model these data using a normal distribution.

Option B is the correct answer.

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Answer:

Iron

Explanation:

If you look up the periodic table of elements you will find that iron is the only element that is there.

Answer:

A. Iron

Explanation:

Iron is an element that is obtained by mining, it is also an ore. It's element symbol is Fe.

The  moles of Ag formed from 91.8 moles of calcium and 41.2 moles of silver nitrate. The balanced formula: Ca(NO3)2 + 2AgCl = 2AgNO3 + CaCl2.

In the balanced equation, the reaction between 2 moles of AgNO3 and CaCl2 yields 2 moles of AgCl.

AgNO3 and AgCl have a molar ratio of 1:1.

The amount of AgCl generated is 18 moles if there are 18 moles of AgNO3 for the reaction with CaCl2.

In this case  41.2 moles of silver nitrate will give,

41.2 ×2

= 82.4 moles of Ag

In the International System of Units, a substance's amount is measured in moles, which are denoted by the sign mol. The quantity of a substance is a measurement of the number of elementary entities of a specific substance present in an object or sample.

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Ignoring electron repulsion, the ground state energy of helium can be related to that of hydrogen by a factor of 4.

This is due to the fact that the ground state energy of an atom is determined by the total energy of its electrons, which is primarily determined by their positions and motions around the nucleus. In the case of hydrogen, the ground state energy is determined by the electron's interaction with the positively charged nucleus. This interaction results in a specific energy level that the electron can occupy.

However, in the case of helium, there are two electrons that occupy the same space and interact with the same nucleus. This results in the phenomenon known as electron repulsion, which makes the energy level of helium higher than that of hydrogen. To ignore electron repulsion means to assume that the two electrons in helium do not interact with each other, which allows us to treat helium as if it had only one electron.

By doing this, the energy level of helium becomes comparable to that of hydrogen, and we can relate them by a factor of 4, which is the ratio of the charge of the helium nucleus to that of the hydrogen nucleus. In summary, ignoring electron repulsion allows us to relate the ground state energy of helium to that of hydrogen by a factor of 4, which is a useful approximation in certain situations.

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The compound X that have a Molecular molar mass of 138 g/mol is

Given here,

Compound x - 6g

malar mass of x - 138g/mol

Carbon dioxide - 13.39 g

water - 2.35g

So,

The moles of Water will be 0.13 mol

The moles of Hydrogen will be 0.26

Mass of hydrogen = 0.26 g

The moles of  CO2  will be 0.304

The moles of carbon will be 0.304

Mass of Carbon = 3.65 g

Mass of  Oxygen = Total mass of the compound - (mass of C + mass of H)

= 6.0 g - ( 3.65 + 0.262 ) g

= 2.09 g

Moles of oxygen = 0.131

Since Oxygen has the least moles, to find the molar ratio of the constituent atom, divide the moles of an atom from oxygen.

C = 0.304/0.131 = 2.8

C = 0.26/0.131 = 2

C = 0.131/0.131 = 1

convert 2.3 into a whole number

C = 2.3*3 = 7

H = 2*3 = 6

O = 1*3 = 3

Hence formula will be C7H6O3

What is molar mass?

The molar mass of a chemical compound is determined in chemistry by dividing the mass of a sample of that compound by the quantity of that compound, which is the number of moles in that sample, measured in moles. The molar mass of a substance is a bulk attribute rather than a molecular one. The compound's molar mass is an average over numerous samples, which frequently have different masses because of isotopes. A terrestrial average and a function of the relative abundance of the isotopes of the constituent atoms on Earth, the molar mass is most frequently calculated using the standard atomic weights. For converting between a substance's mass and amount in bulk amounts, the molar mass is the proper unit.

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Answer:

it's volume also decrease

Answer:

Reactants are C3H8 and O2

Products is CO2 and H20

Answer:

6680 J

Explanation: