how many half lives have passed if 87.5% of a substance has decomposed? how mamy if 99.999% has decomposed?

Answer:

it's 5

Explanation:

k(kkkkksnndjsjsj

Answer:

h=1

o=1

Explanation:

h ±o=2 that means each contains 1

The hydrocarbons in order of the decreasing boiling point is :

Paraffin > Octadecane > Hexane > Neo-hexane > Ethane

The correct option is B.

In the hydrocarbon, the boiling point is directly varies with the length of the carbon chain. If we increasing the number of the carbon atom then the boiling point of the compound will also increases. The Paraffin contains the highest number of the carbon atoms and the ethane is comprised of the  two carbon atoms.

The decreasing order of boiling point of the compound are as follows :

Paraffin > Octadecane > Hexane > Neo-hexane > Ethane

Therefore, the option B is correct.

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The following formula can be used to determine how many moles of KC1 are present in 1250 mL of 0.75 M KC1: Molarity (M) is equal to the moles of solute per litre of solution.

In this instance, the volume of the solution is 1250 mL, and the molarity of KC1 is 0.75 M. The following formula can be used to determine how many moles of KC1 are present in 1250 mL of 0.75 M KC1: Molarity (M) times the number of litres in the solution equals 0.75 M times (1250 mL/1000 mL/L) or 0.9375 moles of KC1.

Consequently, 0.9375 moles of KC1 are present in 1250 mL of 0.75 M KC1. It is significant to remember that a solution's molarity is a measurement of the amount of a solute present in a given volume of the solution.

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\(N_{2}\) has the density of 1.37g/L at 7°C and 0.987 atm pressure.

According to ideal gas equation PM=dRT,

Here P=0.987atm , d= 1.37g/L, T=7°C=280K

so M=\(\frac{1.37*280*0.0821}{0.987}\) = 24 g/mol

What is a ideal gas?

A gas which obey PV=nRT equation and also has negligible volume, and no intermolecular interaction is known as ideal gas.

What is density ?

Density is the ratio of mass and volume.

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Answer: The four inner planets have shorter orbits, slower spin, no rings, and they are made of rock and metal. The four outer planets have longer orbits and spins, a composition of gases and liquids, numerous moons, and rings

Explanation:

pls mark as brainlist by the way we are in the same school  :)

Answer:

11111

Explanation:

1110001001

The answers include the following:

This is referred to as the different types of methods which could be natural or artificial and employs the removal of excess water from a certain area or place.

Water in homes is drained through larger pipes which carry it into collection systems so as to prevent the risk of pollution and contamination of other areas.

Grey water path doesn't involve wastewater from the toilet while the black water comes from only the toilet which is why they were chosen as the correct choice.

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Answer:

The answer is 2

Explanation:

There are two energy sublevels in the second principal energy level. These two energy sublevels are 2s and 2p. The energy distribution in an atom is divided into a number of principal energy levels, and the principal energy levels are again divided into four basic energy sublevels.

The correct abbreviation for each metric unit is:

Kilogram - kg, Milliliter - ml, Kilometer- Km, Meter- m, Millimeter - mm, Centimeter - cm, Gram - g,  Liter - L, and Milligram - mg.

The metric system can be described as a system of measurement that succeeded the decimalized system based on the meter.  Each of the fundamental dimensions can be expressed by a single base unit of measure.

For quantities derived from the base units of the system, units derived from the base units are used such as the square meter being the derived unit for the area, a quantity derived from length.

Metric units can be described as units based on the meter, gram, or second and decimal multiples or sub-multiples of these. The units of the International System of Units (SI). By extension, they involve units of electromagnetism from the CGS units and SI units systems.

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Let's compare the Z, N, and A values for each pair of atoms:
(a) 3H1 and 3He2:
- 3H1: Z=1, N=2, A=3
- 3He2: Z=2, N=1, A=3
The Z and N values are reversed, while the A values are equal.
(b) 14C6 and 15N7:
- 14C6: Z=6, N=8, A=14
- 15N7: Z=7, N=8, A=15
Z values differ by 1, N values are equal, and A values differ by 1.
(c) 19F9 and 18F9:
- 19F9: Z=9, N=10, A=19
- 18F9: Z=9, N=9, A=18
Z values are equal, N values differ by 1, and A values differ by 1.

For the first pair of atoms, 3 H 1 and 3 He 2, the z value (atomic number) is different as hydrogen has 1 proton while helium has 2. The n value (number of neutrons) is also different as helium has one more neutron than hydrogen. However, the a value (mass number) is the same for both, which is 3.
For the second pair, 14 C 6 and 15 N 7, the z value is different as carbon has 6 protons while nitrogen has 7. The n value is also different as nitrogen has one more neutron than carbon. Therefore, the a value is different for both, with carbon having an a value of 14 and nitrogen having an a value of 15.
Finally, for the third pair, 19 F 9 and 18 F 9, the z value is different as fluorine has 9 protons while the other fluorine atom has 1 less proton. However, the n value is the same for both, which is 10. Therefore, the a value is different for both, with the first fluorine atom having an a value of 19 and the second having an a value of 18.
Overall, the z, n, and a values can vary for different pairs of atoms depending on their atomic structure and composition.
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Answer:

You can convert between the various different sizes by merely moving the decimal point the correct number of places. The basic metric units are meters (for length), grams (for mass or weight), and liters (for volume).

Explanation:

With traces of water vapor, carbon dioxide, argon, and other gases, air is a mixture of gases made up of 78% nitrogen and 21% oxygen.

Three gases, nitrogen, oxygen, and argon, account for more than 99% of the air's composition. In very minute amounts, air also contains various gases, including gaseous water, sometimes known as water vapor. Solids and liquids can also be found in air. Pollen, dust, and soot are examples of solids in the air. The gaseous elements nitrogen, oxygen, and lower concentrations of other elements make up the homogenous combination known as air. N2 (78%), O2 (21%), argon (1%), carbon dioxide (0.03%), and water vapor are among the several gases that make up air. These vapors have variable chemical compositions.

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Answer:

The following is the correct match:  

1. Luster refers to how the reflection of the light takes place from a mineral.  

2. Cleavage signifies a manner in which the dissociation of a mineral occurs at the time of stress.  

3. Streak helps in the identification of a true and natural color of a mineral.  

4. Color is the least reliable characteristic of determination.  

5. Hardness is determined with the application of the Mohs scale.  

Answer: For a given mass and volume, how much physical space a material takes up, of an object or substance, the density remains constant at a given temperature and pressure. The equation for this relationship is ρ = m / V in which ρ (rho) is density, m is mass and V is volume, making the density unit kg/m3.

Explanation:

In an ecosystem, farmers  must monitor the quality of their soil because the health of the soil determines the health of their crops.

Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .

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144 mL of fluorine gas is required to react with 1.28 g of calcium bromide to form calcium fluoride and bromine gas at STP.

The ideal gas law states that the pressure of gas is directly proportional to the volume and temperature of the gas.

PV = nRT

where,

P = Presure

V = Volume in liters

n = number of moles of gas

R = Ideal gas constant

T = temperature in Kelvin

Here,

P = 1 atm  [At STP]

R = 0.0821 atm.L/mol.K

T = 273 K  [At STP]

Now first find the number of moles

F₂  +  CaBr₂  →  CaF₂  +  Br₂

Here 1 mole of F₂ reacts with 1 mole of CaBr₂.

So,  199.89 g CaBr₂ reacts with  = 1 mole of F₂

1.28 g of CaBr₂ will react with = n mole of F₂

\(n = \frac{1.28\g \times 1\ \text{mole}}{199.89\ g}\)

n = 0.0064 mole

Now put the value in above equation we get

PV = nRT

1 atm × V = 0.0064 × 0.0821 atm.L/mol.K × 273 K

V = 0.1434 L

V ≈ 144 mL

Thus from the above conclusion we can say that 144 mL of fluorine gas is required to react with 1.28 g of calcium bromide to form calcium fluoride and bromine gas at STP.

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The volume of O₂ (at STP) formed when 50.0 g of KClO₃ decomposes according to the given reaction is 22.4 L.

To calculate the volume of O₂ formed at STP when 50.0 g of KClO₃ decomposes, we need to first write the balanced chemical equation:

2 KClO₃ → 2 KCl + 3 O₂

From the balanced equation, we can see that 2 moles of KClO₃ produce 3 moles of O₂. Therefore, we need to first calculate the number of moles of KClO₃ in 50.0 g of the compound:

Number of moles of KClO₃ = Mass ÷ Molar mass

= 50.0 g ÷ 122.55 g/mol

= 0.408 moles

Now we can use the mole ratio from the balanced equation to find the number of moles of O₂ produced:

Number of moles of O₂ = Number of moles of KClO₃ × (3 moles of O₂ ÷ 2 moles of KClO₃)

= 0.408 moles × (3 ÷ 2)

= 0.612 moles

Finally, we can use the ideal gas law to find the volume of O₂ at STP:

PV = nRT

where P = 1 atm, V = volume of gas, n = number of moles, R = 0.0821 L·atm/mol·K (gas constant), and T = 273 K.

Rearranging the equation to solve for V, we get:

V = nRT ÷ P

= (0.612 mol)(0.0821 L·atm/mol·K)(273 K) ÷ (1 atm)

= 16.2 L

However, this is the volume of O₂ at standard temperature and pressure (STP) for 0°C and 1 atm, while the given temperature is 273 K. Therefore, we need to convert the volume at STP to the volume at the given temperature using the following equation:

V₂ = V₁ × (T₂ ÷ T₁)

where V₁ is the volume at STP (22.4 L), T₁ is the temperature at STP (273 K), V₂ is the volume at the given temperature, and T₂ is the given temperature (273 K).

Substituting the values, we get:

V₂ = 22.4 L × (273 K ÷ 273 K) = 22.4 L

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The new pressure of the gas is 2.25 atm.

We know that the pressure of a given mass of gas is directly proportional to the number of moles of the gas.

Mathematically;

P ∝ n

For two masses of an ideal gas;

P1/n1 = P2/n2

Where

P1 = initial pressure

P2 = Final pressure

n1 = number of moles of gas initially present

n2 = Final moles of gas present

Let the number of moles of the Ar gas be n

Given that;

P1 = 0.75atm

n1 = n

P2 = ?

n2 = 2n

Substituting into the given equation and making P2 the subject of the formula;

P2 = P1n2/n1

P2 = 0.75atm ×2n/n

P2 = 1.5 atm

Since the original mixture was equimolar, the new total pressure of the gas is partial pressure of N2 + new partial pressure of Ar = 0.75 atm + 1.5 atm = 2.25 atm

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Both cohesion and adhesion involve the attraction between molecules, cohesion refers to the attraction between molecules of the same substance, while adhesion refers to the attraction between molecules of different substances.

Comparison of the two properties are: Definition: Cohesion refers to the attraction between molecules of the same substance, while adhesion refers to the attraction between molecules of different substances.

Forces involved: Cohesion involves intermolecular forces (such as hydrogen bonding) that hold the molecules of the same substance together. Adhesion involves the forces of attraction between two different substances, such as the attraction between water molecules and the surface of a glass.

Surface tension: Cohesion contributes to the surface tension of a liquid, which is the property that allows some insects to walk on water without sinking. Adhesion also contributes to the surface tension, as it causes the liquid to adhere to the surface.

Applications: Cohesion is important in determining the physical properties of liquids, such as their viscosity and boiling point. Adhesion is important in many practical applications, such as adhesives and coatings that need to stick to different surfaces.

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Explanation:

At 4th point the slump block is located

hope this helps you

have a great day :)

It is point 2, for anyone who sees this is the future

Answer:

Answer down below!

Explanation:

It would be the force of gravity, because gravity pulls all things toward the center of the Earth. If the book would have fallen down, the force of gravity was put in place.

Answer: The force of gravity

Explanation:

gravity is a force the brings thins towards the core, aka the ground

Answer:

C - raising the temperature of a gas

Explanation:

as you raise temperature, kinetic energy rises, and so does pressure

Answer:

C.

raising the temperature of the gas

Explanation:

Edg. 2020

Other guy is right i got 100%

Answer:

Non-metals are electronegative.

Meaning it only gains electrons in their outermost shell.

For example:

Chlorine atomic number is 17. The electrons are filled in the order of 2,8,7. So, it will try to acquire electrons. The movement of electrons is absent.

While, metals are electropositive.

Meaning it gives electrons and are free to move.

For example:

Copper atomic number is 29. Its electrons are arranged in the order 2,8,18,1. The valence one electron moves. The movement of electrons is present

Electrons need to move freely for the conduction of current. As current means the movement of electrons.

This is why non-metals are bad conductors of elrctricity.

i added a text file nw theres no bad language or stuff it was too long for me to post hope this helps

Answer:

Explanation:

4. Identify four minerals, metal ores, fossil fuels, or sources of groundwater that are found or were once found in your area. Try to find resources that are in your county. (2 points) Agate, jasper, geodes, thundereggs, obsidian, opal, petrified wood, coal, and sunstones are just some of the rocks and minerals found in the state of Oregon

Balanced molecular chemical equation for the reaction in aqueous solution for strontium hydroxide and manganese(v) iodide. 5 Sr(OH)₂(aq) + 2 MnI₅(aq) → 2 Mn(OH)₅(s) + 5 SrI₂(aq).

Chemical equations are symbolic representations of chemical processes where the reactants and products are specified in terms of the corresponding chemical formulae. Chemical equations utilize symbols to indicate things like the direction of a reaction and the physical states of the parties involved in the process. The first chemical equation was developed in 1615 by the French chemist Jean Beguin. Chemical equations can be used to depict chemical processes on paper; an example of this is provided below (for the reaction between hydrogen gas and oxygen gas to form water).

2H2 + O2 → 2H2O

The responding entities are written on the left side of the chemical equation, whereas the products produced during chemical reactions are written on the right side, as can be seen in the example presented above.

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The correct chemical formula of magnesium bromide is MgBr₂.

Ionic bonds are formed by transfer of electrons between metal and non metals.

Electronic configuration of magnesium:

[Mg] :12 : 1s², 2s², 2p⁶, 3s²

Magnesium atom will lose two electron to gain noble gas configuration and form magnesium cation with +2 charge.

[Mg²⁺] : 1s², 2s², 2p⁶

Electronic configuration of bromine:

[Br] :  35 : 1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d¹⁰, 4p⁵

Bromine atom will gain one electron to gain noble gas configuration and form bromide ion with -1 charge.

[Br⁻] : 36 : 1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d¹⁰, 4p⁶

In magnesium bromide, two electrons from metal gets transferred to bromine atom and thus form an ionic bond to give  MgBr₂.

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Answer:

ionic bonding

Explanation:

it exist between two opposite charged particles