Write a balanced nuclear equation for the beta decay of Hg-202

Answer:

i don't understand let us know which one you want us to answer

The mass percent of iron in the ore is 48.4%.

The mass percent of iron in the ore is the ratio of the mass of iron to the mass of the entire sample, expressed as a percentage.

\(mass percent of iron = (mass of iron / mass of sample) x 100%\)

In this problem, we are given the mass of iron and the mass of the sample, so we can substitute these values into the formula and solve:

\(mass\ percent\ of\ iron = (242 g / 500.0 g) * 100%\\mass \percent \of \iron = 0.484 x 100%\\mass \percent\ of\ iron = 48.4%\)

Therefore, the mass percent of iron in the ore is 48.4%.

Learn more about Mass

brainly.com/question/19694949

#SPJ11

Answer:

Bats eat hundreds of mosquitoes and other annoying insects at night.

Answer:

b)6.2 grams

Explanation:

Recall that percentage yield =

actual yield/theoretical yield * 100/1

theoretical yield = 8.2 grams

percentage yield = 75%

Let the actual yield be x

Hence;

75 = x/8.2 * 100

75 = 100x/8.2

75 * 8.2 = 100x

x = 75 * 8.2/100

x = 6.15 g

x = 6.2 g

75 =

the value of qreaction (in J) for the given process is -321.54 J.

For the given problem, the mass of the solution, ms, can be determined as:

ms = 5.101 g + 48.709 g= 53.810 g

The specific heat of the solution, s, is considered to be equal to 4.18 J/g °C (specific heat of water).The change in temperature of the solution, ΔT, can be determined as:

ΔT = final temperature - initial temperature= 19.3 °C - 20.7 °C= -1.4 °C (negative sign indicates that the temperature of the solution has decreased during the process)

Thus, the value of qreaction can be determined as:

qreaction = msΔT

= 53.810 g × 4.18 J/g °C × (-1.4 °C)

= -321.54 J (negative sign indicates that the heat has been absorbed by the solution)

Therefore, the value of qreaction (in J) for the given process is -321.54 J.

learn more about calorimeter here

https://brainly.com/question/24167789

#SPJ11

Answer:

he total number of electrons that an atom either gains or loses in order to form a chemical bond with another atom.

Explanation:

plssssssssssssss like and brainiest

Explanation:

Actually the total abundant of isotopes of any element in the world must sum up to 100 percent. So we initially know that 12c is 98.9 percent. Therefore the remaining of the remains of 100 must be 12

3c = 100%- 98.9

13c= 1.1%

Explosive materials need to be handled carefully and stored appropriately to avoid the possibility of initial combustion.   The following are some of the precautions to take when handling explosive materials: Avoid any type of friction, impact, or shock, whether small or large, when handling explosive materials.

Keep the containers of explosive materials tightly sealed to prevent the infiltration of moisture or contaminants. Store the explosives in a cool, dry, and well-ventilated environment, keeping them away from any heat sources or flammable materials. Keep the explosives away from direct sunlight to prevent the heat from building up and causing an explosion.

In conclusion, explosive materials should be handled and stored with care to prevent initial combustion, which may lead to an explosion. Explosives should be stored in a dry, cool, and well-ventilated area, and containers should be kept tightly sealed to prevent moisture or contaminants from entering. Explosives should also be kept away from any heat sources or flammable materials.

You can learn more about Explosive materials at: brainly.com/question/30756602

#SPJ11

Answer:

V = l * w * h

V = 150.00 mm x 1cm/10 mm x 10.00 cm x 0.95 m x 100 cm/1 m = 1.4 x 104 cm3 D = M/V

M = D * V = 19.3 g/cm^3 * 1.4 * 104 cm^3 = 2.7 x 10^5 g = 270000 grams

Ionic bonds are created when two oppositely charged ions are attracted to one another by electrostatic force. A chemical element is uniquely defined by its atoms, which are tiny pieces of substance.

An atom is made up of a core nucleus and one or more negatively charged electrons that orbit it. The positively charged, comparatively hefty protons and neutrons that make up the nucleus may be present. Any elementary particle of matter with at least one proton is referred to as an atom. Examples of atoms are neon (N) and hydrogen (H) (Ne). Chemistry's fundamental building component is an atom. It is the lowest fraction of substance into which electrically charged particles cannot be released. It is also the smallest piece of substance with chemical element-like characteristics.

learn more about atom  here:

https://brainly.com/question/13654549

#SPJ4

The mass of calcium chloride needed to react with all the sodium carbonate would be 2.63 grams.

The balanced chemical equation for the reaction between calcium chloride and sodium carbonate is:

CaCl2 + Na2CO3 → CaCO3 + 2NaCl

The number of moles of sodium carbonate:

n(Na2CO3) = m ÷ M = 2.51 g ÷ 105.99 g/mol = 0.0237 mol

Equivalent number of moles of calcium chloride required:

n(CaCl2) = n(Na2CO3) = 0.0237 mol

The mass of calcium chloride required:

m(CaCl2) = n(CaCl2) × M(CaCl2) = 0.0237 mol × 110.98 g/mol ≈ 2.63 g

Therefore, approximately 2.63 grams of calcium chloride are needed to react with 2.51 grams of sodium carbonate.

More on stoichiometric problems can be found here: https://brainly.com/question/29775083

#SPJ1

The animal bone is approximately 19,028 years old based on the 40% loss of carbon-14.

To determine the age of an animal bone based on the percentage of carbon-14 remaining, we can use the concept of half-life. The half-life of carbon-14 is approximately 5,750 years, which means that after this time, half of the carbon-14 originally present will have decayed.

If the bone has lost 40% of its carbon-14, it means that only 60% of the original carbon-14 remains. We can calculate the number of half-lives that have passed to reach this percentage.

Let's assume the original amount of carbon-14 in the bone was 100 units. After one half-life, 50 units of carbon-14 would remain (50% of the original amount). After two half-lives, 25 units would remain (50% of 50 units). Similarly, after three half-lives, 12.5 units would remain (50% of 25 units).

To find out how many half-lives it took to reach 60%, we can set up the following equation:

12.5 units (remaining amount) = 100 units (original amount) * (1/2) ^ n (number of half-lives)

Solving for n:

12.5 = 100 * (1/2) ^ n

Dividing both sides by 100:

0.125 = (1/2) ^ n

Taking the logarithm of both sides:

log(0.125) = log[(1/2) ^ n]

n * log(1/2) = log(0.125)

n = log(0.125) / log(1/2)

Using a calculator, we can find:

n ≈ 3.3219

Therefore, approximately 3.3219 half-lives have passed.

Since each half-life is approximately 5,750 years, we can calculate the age of the bone:

Age = Number of half-lives * Half-life duration

Age = 3.3219 * 5,750 years

Age ≈ 19,028 years

Thus, the animal bone is approximately 19,028 years old based on the 40% loss of carbon-14.

learn more about carbon-14 here

https://brainly.com/question/30233846

#SPJ11

Answer:

The heavy particles move across the chamber because of the diffusion property of gas particles. The particles move in straight lines and change directions only when they collide with other molecules or the walls of the chamber.

Explanation:

Answer: sorry

Explanation:

j

Answer:

You need 375 mL of BaCl2 solution.

Explanation:

M1V1=M2V2

Dilution formula. Substitute known values and solve for V1.

M1 = 2.0 M

M2 = 1.50 M

V2 = 500 mL

(2.0 M)(V1) = (1.50 M)(500 mL)

V1 = (1.50 M)(500 mL) / (2.0 M)

V1 = 375 mL

Answer:

C. Mole

Explanation:

Chemical formula deals with mole number

Taking into account the definition of sensible heat, the final temperature if 150.0g of chloroform absorbs 1.0 kilojoules of heat is 31.94 C.

When heat added or removed from a substance causes a temperature change in it without affecting its physical state (phase change), it is called sensible heat.

The expression that allows to calculate heat exchanges is:

Q = c× m× ΔT

where:

In this case, you know:

Replacing in the definition of sensible heat:

1000 J = 0.96 J/gC× 150 g× (Tfinal - 25 C)

Solving:

1000 J = 144 J/C× (Tfinal - 25 C)

1000 J÷ 144 J/C= Tfinal - 25 C

6.94 C= Tfinal - 25 C

6.94 C + 25 C= Tfinal

31.94 C= Tfinal

Finally, the final temperature is 31.94 C.

Learn more about sensible heat:

brainly.com/question/12670283

#SPJ1

Answer:

The correct option is;

Action potentials travel the length of the axon

Explanation:

A dendrite are nerve cell projections that are used for receiving signals from other nerve cells

A neurotransmitter is the chemical, produced by the nerve cell to contain the message the nerve cell intends to transmits across a neural junction, to the cell for which the message is meant such as a muscle cell, gland cell, or other nerve cells

Therefore, the received message from the dendrite by the present neuron are transported using action action potential which is the means by which electrical signals are transported by a neuron through the length of the axon which is the projection of the nerve cell, known as the nerve fiber that conducts action potential which are electrical impulses to other destination by traveling the length of the of the axon to the location of the destination cell of the action potential

Tο make 149.7 g οf CH₄, 9.32 mοles (οr 9.34 mοl, rοunded tο twο decimal places) οf carbοn are required.

Methane has the chemical fοrmula CH₄. Accοrding tο the fοrmula, 1 mοle οf carbοn atοms makes up 1 mοle οf methane.

The reactiοn's chemically balanced equatiοn is as fοllοws:

C + 2H₂ → CH₄

The mοlar mass οf CH₄ (methane) is:

12.01 g/mοl (fοr C) + 4(1.01 g/mοl) = 16.05 g/mοl

1 mοle οf C prοduces 1 mοle οf CH₄

Sο, the number οf mοles οf carbοn required can be calculated as fοllοws:

Mοles οf CH₄ = Mass οf CH₄ / Mοlar mass οf CH₄

Mοles οf CH₄ = 149.7 g / 16.05 g/mοl

Mοles οf CH₄ = 9.32 mοl

An alternative is tο use the quantity οf carbοn needed tο make 149.7 g οf CH₄. We may cοnvert the mass οf CH₄ tο mοles οf carbοn using the mοlar mass οf carbοn (12.01 g/mοl):

Mass οf C = Mass οf CH₄ / (Mοlar mass οf CH₄ / Mοlar mass οf C)

Mass οf C = 149.7 g / (16.05 g/mοl / 12.01 g/mοl)

Mass οf C = 112.28 g

Using the mοlar mass οf carbοn, it is pοssible tο cοnvert the mass intο the number οf mοles οf carbοn:

Mοles οf C = Mass οf C / Mοlar mass οf C

Mοles οf C = 112.28 g / 12.01 g/mοl

Mοles οf C = 9.34 mοl

To know more about carbon visit:-

brainly.com/question/3049557

#SPJ1

Answer:

0.305 mol

Explanation:

Ca(NO) is not a molecule. I think you meant to type Ca(NO3)2, which is calcium nitrate.

The moles of a compound is equal to is mass divided by its molar mass.

The molar mass of Ca(NO3)2 is 164.09 g/mol.

50.0 / 164.09 = 0.305

Answer:

One atom has been reduced

Explanation:

One atom has been reduced because its oxidation state has fallen. The other has been oxidised. This is a good example of a disproportionation reaction. A disproportionation reaction is one in which a single substance is both oxidised and reduced.

Answer:

It is the temperature at which water is frozen or is pure ice

"Absolutely zero" temperature is the coldest temperature possible. It's so cold that everything stops moving and has no energy left. Scientists use a special scale called Kelvin to measure temperature, and absolute zero is at 0 Kelvin or -273.15 degrees Celsius (-459.67 degrees Fahrenheit). We can't actually reach absolute zero in real life, but scientists have come very close in laboratories using special cooling methods.

In the bicarbonate buffering system, carbon dioxide and water join to form carbonic acid, which dissociates into hydrogen and bicarbonate.

A buffer solution resists the changes in acidity by combining with the hydrogen ions that were added and inactivates them. It is a solution of weak acid and its conjugate base, (carbonic acid and bicarbonate). The natural conversion of carbon dioxide into carbonic acid is slow.

Bicarbonate buffer absorbs hydrogen ions and forms carbonic acid. The total number of hydrogen ions and hence the pH of the solution does not change. Bicarbonate is consumed and carbonic acid is produced when hydrogen ions are added.

To learn more about bicarbonate buffers ; https://brainly.com/question/28458012

#SPJ4

Fe2S3 is The Empirical Formula Of A Compound Containing 53.70% Iron And 46.30% Sulfur.

Fe = 0.961 mol and S = 1.44 mol, Now divide them to get lowest empirical formula. When the subscripts in a chemical formula represent the simplest ratio of the kinds of atoms in the compound, the formula is called an empirical formula.

Most ionic compounds are described with empirical formulas. A molecular formula describes the actual numbers of atoms of each element in a molecule. A compound that contains ions and is held together by ionic bonds is called an ionic compound. The periodic table can help us recognize many of the compounds that are ionic:

When a metal is combined with one or more nonmetals, the compound is usually ionic. This guideline works well for predicting ionic compound formation for most of the compounds typically encountered in an introductory chemistry course. However, it is not always true (for example, aluminum chloride, AlCl3, is not ionic).

To know more about empirical formula here

https://brainly.com/question/1439914

#SPJ4

Answer:

C: It traps pathogens in oil and sweat

Explanation:

The skin has oil and sweat which kills pathogens as they are like a waterbarrier.

The skin protects the body from pathogens by trapping pathogens in oil and sweat produced by glands. Thus, the correct option for this question is C.

Pathogens may be defined as those living organisms which are capable of inducing diseases in other living organisms including humans. Some examples of pathogens include bacteria, fungi, protozoa, etc.

Skin is considered the first line of defense against pathogens in humans. This is because skin significantly consists of sebaceous and sweat glands that consistently secrete oils and sweat that trap the pathogens and eliminate them from entering the body.

Therefore, the skin protects the body from pathogens by trapping pathogens in oil and sweat produced by glands. Thus, the correct option for this question is C.

To learn more about Pathogens, refer to the link:

https://brainly.com/question/14162086

#SPJ2

Answer:

C2H30 is a compound formed when atoms of Carbon, Hydrogen and Oxygen reacts together.

Answer:

C2H30 is a compound formed when atoms of Carbon, Hydrogen and Oxygen reacts together

The external pressure is the pressure exerted by the gas molecules in the air outside the balloon on the surface of the balloon.

Assuming that the temperature and pressure inside the balloon stay constant, the volume of the balloon grows as the number of gas particles inside the balloon rises. However, because the gas molecules in the air surrounding the balloon continue to press on its surface with the same force they had before it expanded, the external pressure stays the same.

Although the balloon's surface area does grow as it expands, this does not necessarily translate into a change in pressure. The force of the gas molecules striking the balloon's surface determines the pressure, not the area of the balloon.

Learn more about gas pressure:https://brainly.com/question/31525061

#SPJ1

Answer:

4.70 grams of NH4Cl is needed to prepare 350 mL of a 0.25 M ammonium chloride solution.

We need approximately 4.68 grams of NH4Cl to prepare a 0.25 M ammonium chloride solution with a volume of 350 mL.

To determine the mass of NH4Cl needed to prepare the solution, we us use the formula:

m=M x V x MM ... (i)

where,

m= mass in grams

M=molarity of solution

MM= molar mass of compound

V= volume in litres

The number of moles of NH4Cl needed can be calculated using:

  Moles = Molarity x Volume ...(ii)

  Moles = 0.25 mol/L x 0.350 L

  Moles = 0.0875 mol

Hence we can replace M x V with number of moles in equation i.

The molar mass of NH4Cl is :

  Molar mass of NH4Cl = (1 x 14.01 g/mol) + (4 x 1.01 g/mol) + (1 x 35.45 g/mol)

  Molar mass of NH4Cl = 53.49 g/mol

We have all the variables

Putting them in equation i.

Hence,

  Mass (g) = Moles x Molar mass

  Mass (g) = 0.0875 mol x 53.49 g/mol

  Mass (g) = 4.68 g

Therefore, you would need approximately 4.68 grams of NH4Cl to prepare a 0.25 M ammonium chloride solution with a volume of 350 mL.

To learn more about Stoichiometry,

https://brainly.com/question/16060223

The commonly held belief that you can boil water faster by adding salt (a nonvolatile solute) is not true.

According to the concepts of colligative properties, the boiling point of a solution is increased by the addition of a nonvolatile solute. This implies that the boiling point of saltwater should be higher than that of pure water, not lower.

However, salt does have an impact on the rate of boiling water. The addition of salt to water, particularly a small quantity, has no effect on the boiling process or on the temperature at which it occurs. The reason for this is that adding salt to water does not reduce the amount of heat required to boil it, so it boils at the same temperature as pure water

.However, when salt is added to water in greater amounts, the boiling temperature of the water increases. In other words, the more salt that is added to water, the higher the boiling temperature becomes. This is due to the fact that adding a nonvolatile solute raises the boiling point of the solution.

Learn more about solution at:

https://brainly.com/question/29454798

#SPJ11