A sample of 150 Boron (B) atoms are taken where 120 have a mass of 10 and 30
have a mass of 11. What is the percent abundance of B-10?
A 20%
B 30%
C 10%
D 80%
F 11%

America's age = 243.85 years

When converting units, list and multiply all the units until you find the unit you want

Time unit conversion

1 year = 365 days

1 day = 24 hours

1 hour = 3600 s

7.69 x 10⁹ seconds to years :

\(\tt =7.69\times 10^9~s\times \dfrac{1`hour}{3600~s}\times \dfrac{1~day}{24~hours}\times \dfrac{1~years}{365~days}\\\\=\dfrac{7.69\times 10^9}{3600\times 24\times 365}\\\\=\boxed{\bold{243.85~years}}\)

Acids i think... because I know for sure H3PO4 is a acid and so is Hbr...

Answer:

B. Acids

Explanation:

All of them are acids because H3PO4 is phosphoric acid, HBr is hydrobromic acid, H2SO4 is sulfuric acid, and HNO3 is nitric acid.

Pls. give me a lot of points I took a lot of time to help you. :)

Answer: 19.4 mL Ba(OH)2

Explanation:

H2(g) + Cl2(g) --> 2HCl(aq) (make sure this equation is balanced first)

At STP, 1 mol gas = 22.4 L gas. Use this conversion factor to convert the 100. mL of Cl2 to moles.

0.100 L Cl2 • (1 mol / 22.4 L) = 0.00446 mol Cl2

Use the mole ratio of 2 mol HCl for every 1 mol Cl2 to find moles of HCl produced.

0.00446 mol Cl2 • (2 mol HCl / 1 mol Cl2) = 0.00892 mol HCl

HCl is a strong acid and Ba(OH)2 is a strong base so both will completely ionize to release H+ and OH- respectively. You need 0.00892 mol OH- to neutralize all of the HCl. Note that one mole of Ba(OH)2 contains 2 moles of OH-.

0.00892 mol OH- • (1 mol Ba(OH)2 / 2 mol OH-) • (1 L Ba(OH)2 / 0.230 M Ba(OH)2) = 0.0194 L = 19.4 mL Ba(OH)2

Answer:

1 grams H2SO4 is equal to 0.010195916576195 mole.

Explanation:

Answer:

Formula/Molecular Mass = 147.77415g/mol = 148g/mol (to 3 significant figures)

Explanation:

Given the Law of the Conservation of Mass, the amount of H2O produced will be equal to 10.00g-4.40g = 5.6g

Given equation n=m/M ,

n(H2O)= 5.6/ (1.008×2)+(15.999) = 0.318520677 moles

∴ x=0.318520677 moles

∴ Molecular mass (hydrated sodium sulfate) =

= (22.990×2)+(32.06)+(15.999×4)+[0.318...((1.008×2)+(15.999))]

= 147.77415g/mol

Answer:

Answer is in the attachment:

x=10

Explanation:

Answer:O B. Weak acid breaks down minerals by reacting with them.

Explanation:

Chemical weathering is the process whereby rain water which sometimes can be acidic ( As rain falls down it reacts with CO2 in the atmosphere and form acid rain), This  reacts  with the minerals contained in rocks, dissolves and degrades  them further to form entire  new minerals.

An example of a rock that is greatly affected by overexposure of  acid rain is  limestone containing calcite  which easily degrades by acid rain.

Other processes whereby Chemical weathering can occur are through reaction with water and oxygen.

Answer:

start moving faster

Explanation:

i would guess because they slow down our freeze when they get cold

Answer:

we have four moles in 56L of co2

The molar mass of the given gas at 10°C and 1.0 atm is equal to 22.74 g.

The ideal gas law can be demonstrated as an equation of the state of a  perfect gas. This equation can be described as the product of the volume and pressure of a perfect gas being equal to the product of the universal gas constant and absolute temperature of that gas.

Mathematically,  the ideal gas equation can be written as follows:

PV = nRT

Where n is the moles of gas, P is the pressure,  V is the volume of the gas,  and R is the gas constant.

PV = (m/M)RT

M = (m/V) × RT/P

M= DRT/P

where D is the density of the gas.

Given, the density of the given gas, D = 0.98 g/L

The temperature of the gas, T = 10° C = 273 + 10 = 283 K,

The pressure of gas, P = 1.0 atm

The value of the gas constant, R = 0.082 atm.L /K mol

Substituting the values D, R, P, and T in the equation, we get:

M = 0.98× 0.082 ×283/1

M = 22.74 g

The molar mass of the gas is equal to 22.74 g.

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Answer:

Ice: solid and rigid. Water: Liquid and sloshy Gas: light and not dense.

Explanation:

Up ^

Answer:

The ecosystem would collapse.

Explanation:

The food chain is need to keep everything in balance. Each level keeps the level under it in check. Without predators some species might grow in population and overuse their resources thus killing their entire species.

Answer:

67.08 g

Explanation:

you firts write what u know

then u calculate the molar mass of the salt

then according to the formula mass= number of mols × molar mass you find the mass

m= mass

n= number of mol

M= molar mass i hope this helps

The energy  for the  do 3.0 moles of photons, all with a wavelength of 665 nm,  is  548 kJ

Since we know that the wavelength is the distance between the corresponding trough or crest of a wave. Since the formula for calculating the  energy of a photon is :

E = hc/λ, where h is Planck's constant, λ is the wavelength of the wave. and c is the speed of light.Now substituting the values   in the above formula we get,

E = (6.63x10⁻³⁴ J·s) (3x10⁸ m/s) / (655 x10⁻⁹ m)

E = 3.03x10⁻¹⁹ J.

Now the energy of 3 moles of photons will :

=3.03x10⁻¹⁹ J x 6.023 x 10²³/mol x 3.0 mol / 1000

= 548 kJ

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Answer:

- A ball does not move unlesss you kick it and it rolls aways

- a car stays still and is not in motion, unless you start the engine

- a pencil stays still on a table, it moves when you pick it up off the table

Explanation:

The rate constant (k) for the given reaction is approximately 150.72 M^-2s^-1.

The rate law for the reaction is given as first order in both CH3Br and OH-. This implies that the rate of the reaction is directly proportional to the concentration of each reactant raised to the power of one.

Therefore, the rate law can be expressed as:

Rate = k[CH3Br][OH-]

Where k is the rate constant.

Now, let's use the given values to determine the rate constant:

[CH3Br] = 0.0949 M

[OH-] = 8.0 x 10^-3 M

Rate = 0.1145 M/s

Plugging these values into the rate law equation, we get:

0.1145 M/s = k * (0.0949 M) * (8.0 x 10^-3 M)

Simplifying: 0.1145 = k * 7.592 x 10^-4

Solving for k:

k = 0.1145 / (7.592 x 10^-4)

k ≈ 150.72 M^-2s^-1

Therefore, the rate constant (k) for the given reaction is approximately 150.72 M^-2s^-1.

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Answer:

Ron and Hermoine

Explanation:

They always fought over petty things, but at the end, they did end up together!

(Answer for your question about love and friendship being a central theme in Harry Potter and the Philosopher's stone)

*ALSO, MY ANSWER MIGHT BE WRONG* so be sure to use a pencil just in case!

Answer:

An atom of Sulfur

Explanation:

i did a Quick search and im trying to get pass the "help a person first"

Answer:

• A collection of atoms of Sulfur

Explanation:

I'll assume the notation is written as \(S_{8}\).  A subscript after an element symbol represent the number of individual atoms of the symbol.  In this case \(S_{8}\) is telling us we have 8 sulfur atoms that are somehow connected to each other.  That is in contrast with 8S, which means we have 8 different sulfur atoms.  A chemical formaula, such as \(CH_{4}\) tells us we have a molecule containing 1 carbon atom and 4 hydrogen atoms.

All statements given in the question are incorrect except for 1 statement. The correct statement is:1 s = 10^3 ms.

In the question, we have been provided with 5 statements. We are asked to select all the correct statements from those 5 statements. Given below are for each statement:1 g = 10^3 mg:This is incorrect. 1 g is equal to 1000 mg.10^-3 g = 10^12 ng:This is incorrect. 10^-3 g is equal to 1 mg.1 km = 10^5 mm:This is incorrect. 1 km is equal to 1,000,000 mm.1 s = 10^6 μs:This is incorrect. 1 s is equal to 1,000,000 μs.1 s = 10^3 ms:This is correct. 1 s is equal to 1000 ms.Therefore, the main answer to this question is that only 1 statement is correct, which is:1 s = 10^3 ms.

Metric units are based on the power of ten. The base units of the International System of Units (SI) are the meter, kilogram, second, kelvin, ampere, mole, and candela. All other metric units can be derived from these basic units.The first unit in each conversion is in grams, seconds, or kilometers. The metric units for millimeters, microseconds, and nanograms are derived from these basic units. One gram is equal to 1000 milligrams (mg), 1 second is equal to 1000 milliseconds (ms), and 1 kilometer is equal to 1000000 millimeters (mm). 10^-3 g is equal to 1 milligram (mg), 10^6 μs is equal to 1 second (s), and 10^12 ng is equal to 1 gram (g).

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The most polar covalent bond among the options given is the C-F bond. Therefore, the correct option is c. C-F.

In a covalent bond, atoms share electrons, but when there is a difference in electronegativity, the electrons tend to spend more time closer to the more electronegative atom.

Fluorine (F) is the most electronegative element on the periodic table, while carbon (C) has a lower electronegativity.

As a result, the electrons in the C-F bond are pulled closer to the fluorine atom, creating a partial negative charge on the fluorine and a partial positive charge on the carbon.

This separation of charge makes the C-F bond the most polar covalent bond among the options.

Polarity arises due to the electronegativity difference between the atoms. The larger the electronegativity difference, the more polar the bond.

In this case, the electronegativity difference between carbon and fluorine is the greatest among the options provided.

The C-F bond is highly polar because of the large electronegativity difference between carbon and fluorine, resulting in a significant separation of charge.

Therefore, a C-F bond is the most polar covalent bond among the given options.

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Answer:

Carbon monoxide

Explanation:

The molecule has the carbon and oxygen atoms in equal amounts.

Answer:

Don't throw paints, oils or other forms of litter down the drain. Use environmentally household products, such as washing powder, household cleaning agents and toiletries. Take great care not to overuse pesticides and fertilisers. This will prevent runoffs of the material into nearby water sources.

Answer:

I think it's D, cicada.

According to Oxford, a Hemipteran is "an insect of the order Hemiptera, such as an aphid, cicada, or leafhopper."

Hope this helps! I also hope it's not wrong, but I do not think it is.

Also please let me know if this is correct.

Answer:

gari / sugar

Explanation:

A phase diagram is a plot of temperature on the x-axis vs. pressure on the y-axis.

This diagram shows the stable regions for each phase of matter (solid, liquid, gas) and the conditions under which these phases may exist in equilibrium.

A phase diagram is a graphical representation that illustrates the relationship between temperature, pressure, and the phases of a substance. The x-axis of the phase diagram represents temperature, usually in degrees Celsius or Kelvin, while the y-axis represents pressure, typically in units like atmospheres or kilopascals.

The phase diagram outlines the different regions or regions where each phase of matter (solid, liquid, or gas) is stable under specific temperature and pressure conditions. The boundaries between these regions represent phase transitions, such as melting, boiling, or sublimation.

By examining a phase diagram, one can determine the conditions at which a substance exists in a particular phase and the conditions required for phase transitions to occur. The phase diagram provides valuable information about the behavior and stability of substances under different temperature and pressure conditions.

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In the electrophilic aromatic substitution reaction between benzaldehyde and Br2 in the presence of FeBr3, the first step involves the generation of a carbocation intermediate. This carbocation is formed when the bromine molecule attacks the benzene ring, displacing a proton.

Since benzaldehyde is a meta-director, the carbocation intermediate will be stabilized through resonance. The resonance structures can be represented as follows:

Structure 1:

      Br

       |

Ph-C(+)-H

       |

Structure 2:

      Br

       |

Ph-C-H

  |    |

  +    Ph

Structure 3:

      Br

       |

Ph-C-H

  |    |

Ph    +

In these resonance structures, the positive charge of the carbocation is delocalized throughout the benzene ring. The presence of the electron-withdrawing aldehyde group (CHO) in benzaldehyde directs the incoming bromine atom to the meta position relative to the aldehyde group.

Please note that it's always recommended to consult reliable sources and appropriate references for accurate structural representations.

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The correct IUPAC name for the molecule is option c) 4,6,7-tetramethylnonane.

To name the molecule, we start by identifying the longest continuous carbon chain, which in this case contains nine carbon atoms. We number the chain from the end that gives the substituents the lowest possible numbers, which gives us the numbering 1-2-3-4-5-6-7-8-9.

The molecule has three branches: a propyl group on carbon 5, an ethyl group on carbon 2, and a methyl group on carbon 3. We name these branches as substituents and indicate their positions with their respective numbers. Therefore the correct IUPAC name for the molecule is 4,6,7-tetramethylnonane.

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Answer:  extremely sensitive to environmental changes caused by habitat destruction, climate change, pollution

Explanation:

Across the world, amphibians have been disappearing at an unprecedented rate — faster than any other group of animals. Frogs, toads, and salamanders are extremely sensitive to environmental changes caused by habitat destruction, climate change, pollution, and invasive species.

The average atomic mass of sodium with two isotopes, considering their respective masses and abundances, is 22.72 amu. Isotope 1 has a mass of 22 amu and an abundance of 28%, while isotope 2 has a mass of 23 amu and an abundance of 72%.

To calculate the average atomic mass of sodium with two isotopes, you'll need to take into account the percentage and mass of each isotope. Here's the formula:

Average atomic mass = (Isotope 1 mass × Isotope 1 abundance) + (Isotope 2 mass × Isotope 2 abundance)
In this case:
Isotope 1: mass = 22 amu, abundance = 28% (or 0.28)
Isotope 2: mass = 23 amu, abundance = 72% (or 0.72)
Average atomic mass = (22 × 0.28) + (23 × 0.72) = 6.16 + 16.56 = 22.72 amu
So, the average atomic mass of sodium in this scenario would be 22.72 amu.

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The kind of intermolecular forces that act between a tetrachloroethylene (C2Cl4) molecule and a hydrogen (H2) molecule are London dispersion forces.

Tetrachloroethylene has a larger molecular size and higher electron density, which results in stronger London dispersion forces compared to hydrogen. These intermolecular forces allow the two molecules to attract each other and interact.

London dispersion forces are the weakest type of intermolecular forces and occur between all molecules, whether polar or nonpolar. They arise due to temporary fluctuations in the electron distribution around molecules, which create instantaneous dipoles that attract other nearby molecules. In this case, both C2Cl4 and H2 are non-polar molecules, so London dispersion forces are the primary intermolecular forces acting between them.

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