Write the symbol for each isotope in the form Ax.
(a) cobalt-60
(b) neon-22
(c) iodine-131
(d) plutonium-244

Answer:

1. 17.4 moles.

2. 1.13 moles

3. 315.5 moles

4. 390.6g

5. 1.13x10⁶ moles

6. 14.8 moles

7. 337 moles

8. 2.15x10²⁴ molecules

9. 3.13x10²⁴ atoms

10. 1.38x10²⁴ particles

11. 1517g

12. 455g of CaF₂

Explanation:

We can convert formula units to moles or vice versa using Avogadro's number and moles to grams using molar mass of the substance:

1. Molar mass NH3: 17.031g/mol

297g * (1mol / 17.031g) = 17.4 moles

2. Molar mass MgCO3: 84.3g/mol

95g * (1mol / 84.3g) = 1.13 moles

3. Using Avogadro's number (6.022x10²³ formula units / mol):

1.9x10²⁶FU * (1mol / 6.022x10²³FU) = 315.5 moles

4. Molar mass H2O: 18g/mol

21.7mol * (18g / mol) = 390.6g

5. Using Avogadro's number (6.022x10²³ molecules / mol):

6.78x10²⁹molecules * (1mol / 6.022x10²³FU) = 1.13x10⁶ moles

6. 8.9x10²⁴FU * (1mol / 6.022x10²³FU) = 14.8 moles

7. Using Avogadro's number (6.022x10²³ atoms / mol):

2.03x10²⁶atoms* (1mol / 6.022x10²³FU) = 337 moles

8. 3.569mol * (6.022x10²³ molecules / 1mol) = 2.15x10²⁴ molecules

9. 5.2mol * (6.022x10²³ atoms / 1mol) = 3.13x10²⁴ atoms

10. Molar mass Li₂SO₄: 109.94g/mol:

36g * (1mol / 109.94g) * (6.022x10²³ molecules / 1mol) * (7 particles / 1molecule) = 1.38x10²⁴ particles

Assuming particles are atoms and in 1 molecule of Li₂SO₄ you have 7 atoms.

11. Molar mass Cl₂: 70.9g/mol:

21.4mol * (70.9g / mol) = 1517g

12. Molar mass CaF₂: 78.07g/mol:

3.51x10²⁴FU * (1mol / 6.022x10²³FU) * (78.07g / mol) = 455g of CaF₂

Answer:

Between 4s and 3s orbital , 3s has more energy .

Explanation:

According to the rule , the lower the value of (n+l) for an orbital , the lower is it's energy . And if two orbitals have the same value of (n+l), the orbital with lower value of n will have the lower energy .

The statement " for all atoms of the same element the 4s orbital is larger than the 3s orbital" is definitely true.

An element may be defined as a type of substance that significantly cannot be dilapidated into simpler components by any non-nuclear chemical reaction. It is a type of chemical substance that bears unique properties based on numerous attributes.

The 4s orbital is the outermost and highest energy orbital, as compared to the 3s orbital. The 4s orbital penetrates more into the nucleus. This is because the s-orbital has the highest penetrating effect as compared to other orbitals.

The size of the 4s orbital is usually larger than the 3s orbital for all the atoms of the same element. This is because the electrons are filled in these orbitals systematically in the order s, p, d, and f. In the s-orbital first, 1s, 2s, 3s, 4s, and so on depending on the atomic number of the atom or element.

Therefore, the statement " for all atoms of the same element the 4s orbital is larger than the 3s orbital" is definitely true.

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Answer:

what's the answer choices

Explanation:

huh

The percent error of Chemistry student : 7.4%

Given

40 °C measurement

Required

The percent error

Solution

% Error : difference between the theoretical value and the actual value

or

% Error : Absolute Error / Accepted Value

Absolute Error = Measured Value - Accepted Value

% Error for Chemistry student  :

1. Subtract the measurement value with the accepted value

= 40 °C - 43.2 °C

= -3.2 °C

2. Divide by the accepted value, and multiply by 100

= |-3.2/43.2| x 100%

= 7.4%

Answer:

D

Explanation:

Color, texture, and density are all physical properties but reactivity is a chemical property so the answer is D.

Answer:

The total number of protons and neutrons is the mass number of an atom.

Explanation:

The mass number is made up of the total protons and neutrons in an atom. The mass number represents the mass of the atom in amu (atomic mass units). Electrons are not included in this representation because their mass is negligible (practically 0). The atomic number is made up of the total protons in an atom.

The frequency of this radiation of a quantum of energy 4.14 *10-14 J is calculated to be 2.58 *10-15 Hz.

The Photoelectric Effect occurs when electrons are released from a metal surface when light strikes it. It was once thought that the greater the intensity of incoming light, the greater its energy, independent of hue. The light was viewed and treated as a wave, however, the wave phenomenon could not explain light's photoelectric actions.

The Quantum, according to Max Planck, is the smallest unit of energy that is released or absorbed in the form of electromagnetic radiation. The energy released or absorbed is proportional to the frequency of the radiation. It may be expressed mathematically as:

E= hc/λ

or

E= hf        ( because, f = c/λ)

where,

E= Energy of the particle

h= Planck's constant

c= speed of light

λ= wavelength of the particle

f = frequency of the radiation

Thus, E= hf

Given,

E = 4,14*10-14J

E= 1.71017356 * 10^20 eV

h= 6.626 *10-34 m2Kg/s

E=hf

f= E/h

f= (1.71017356 * 10^20 eV) / (6.626 *10-34 m2Kg/s)

f= C

Thus, the frequency of this radiation is 6.626 *10-34 m2Kg/s.

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This statement is referring to a laboratory experiment in molecular biology or genetics where DNA has been labeled with the fluorescent dye Cy5, which emits a red signal when excited by light. The experiment has revealed that the labeled DNA (in this case, the test DNA) is present along the short arm of chromosome 3. This information can be used to study the location of specific genes or other genetic elements on the chromosome. The use of the reference DNA allows for the comparison of the test DNA to a known and well-characterized reference, which can provide additional information about the identity and location of the test DNA.

Answer:

This labeling information suggests that the test DNA, which was labeled with the dye Cy5 (red), is present along the short arm of chromosome 3 in the reference DNA sample. The bright red signal indicates a high concentration of the labeled test DNA in that region, which could indicate that the test DNA is interacting with or mapping to that specific location on chromosome 3. This information can be used in various genomic studies, such as genome mapping, gene expression analysis, and chromatin analysis, to better understand the distribution and function of specific DNA sequences in the genome.

Explanation:

Just tell me if you kinda confuse


ALLEN

Answer:

                                                                2CO(g) + O2(g) ⇌ 2CO2(g)

Increasing the concentration of CO -         ↓         ↓                 ↑

Increasing the concentration of CO2 -       ↑         ↑                 ↓

Explanation:

The given reaction is

2CO(g) + O2(g) ⇌ 2CO2(g)

a) When the concentration of CO is increased, the stress is relieved as the reaction that consumes the added CO occurs more rapidly than its reverse reaction, for example., the forward reaction rate increases. The equilibrium will shift in favor of the product. However, the concentration of reactants (CO and O2) decreases and product concentration (CO2) increases.

b) When the concentration of CO2 is increased, the stress is relieved as the reaction that consumes the added CO2 occurs more rapidly than its reverse reaction, for example., the rate of backward reaction increases. The equilibrium will shift in favor of the reactant. Therefore, the concentration of reactants (CO and O2) increases, and the product concentration (CO2) decreases.

Hope this helps!

Answer:

no

Explanation:

Answer:no

Explanation:The moon orbits the Earth once every 27.322 days. It also takes approximately 27 days for the moon to rotate once on its axis.

Answer:

8Al+3Fe3O4=4Al2O3+9Fe

Answer:

8Al + 3Fe3O4 → 4Al2O3 + 9Fe

Explanation:

The concentration of the final solution is 0.0018 M or 1.8 millimoles per liter (since 1 mole = 1000 millimoles).

To calculate the concentration of a solution after dilution, we can use the equation:

C1V1 = C2V2

Where C1 is the initial concentration, V1 is the initial volume, C2 is the final concentration, and V2 is the final volume.

In this case, the initial volume (V1) is 1.48 ml and the initial concentration (C1) is 0.0037 M. The final volume (V2) is the sum of the initial volume and the volume of solvent added (1.48 ml + 1.51 ml = 2.99 ml). The final concentration (C2) is what we are trying to calculate.

Using the equation above, we can solve for C2:

C1V1 = C2V2

0.0037 M x 1.48 ml = C2 x 2.99 ml

C2 = (0.0037 M x 1.48 ml) / 2.99 ml

C2 = 0.0018 M

Therefore, the concentration of the final solution is 0.0018 M or 1.8 millimoles per liter (since 1 mole = 1000 millimoles).

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Answer:

Definitely the fire burning is.

Explanation:

It’s a chemical combustion

Answer:

yes

Explanation:

Fire that burns is a very good example

Answer:

The conductivity of the atom depends on the number of electrons that are in the valence shell. When an atom has only one electron in valence shell, it is almost a perfect conductor. When an atom has eight valence electrons the valence shell is said to be complete and the atom is an insulator.

- Spokane.edu

20.4 gallons of Isooctane fuel is 117.7786 lb.

1 gallon = 3785 cm3 = 4 quart; 1 pound = 453.6 g.

 So here. 20.4 gallons = 20.4 x 3785 cm³ = 77214 cm³ = 77214 ml

D = m/v  ⇒ mass = density x volume

Given density is 0.6919 g/cm3

Mass = 0.6919 x 77214 = 53424.3666 g

1 g = 1/453.6 lb ⇒ 53424.3666 g =53424.3666 /453.6 lb = 117.7786 lb.

isooctane or iso-octane is also known as 2,2,4-Trimethylpentane,  
being an important component of gasoline, it is  used in relatively large proportions (around 10%) to increase the knock resistance of fuel.
An antiknock agent is a gasoline additive which is  used to reduce engine knocking and also increases fuel's octane rating by raising the temperature and pressure at which auto-ignition occurs.

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Explanation:

i believe this is right. my bad if its not

The result in binary would be 10000011110101100000.

By constantly dividing the supplied number by 2 until we receive 0 as the quotient, we can convert a decimal number to a binary number in the simplest way possible. The binary value of the specified decimal number is then obtained by writing the remainders in reverse order. A binary number is made up of two 0s and 1s. Two is used as the base representation for binary numerals. As an illustration, (101)2 (101) 2. Switches can be used to encode and store numbers in binary form. This system is compatible with a variety of digital devices, including computers, calculators, digital TV decoder boxes, cell phones, burglar alarms, watches, and more. Binary values are kept in memory, which is essentially a collection of electronic on/off switches.

The complete question is- Convert 540000 to Binary form.

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The average atomic mass of titanium on the given planet is approximately 46.68164 atomic mass units (u). The average atomic mass may vary depending on the specific isotopic composition of titanium found on different celestial bodies or regions.

To calculate the average atomic mass of titanium on the given planet, we need to consider the natural abundances and masses of each isotope of titanium.

The average atomic mass is calculated by multiplying the natural abundance of each isotope by its respective mass and summing them up.

Let's perform the calculation step by step:

Step 1: Multiply the abundance of each isotope by its mass:

(73.700% * 45.95263 u) + (15.000% * 47.94795 u) + (11.300% * 49.94479 u)

Step 2: Calculate the individual contributions from each isotope:

= (0.737 * 45.95263) + (0.150 * 47.94795) + (0.113 * 49.94479)

Step 3: Add up the individual contributions:

= 33.84765431 + 7.1921925 + 5.64179347

Step 4: Sum up the contributions:

= 46.68164 u

Therefore, the average atomic mass of titanium on the given planet is approximately 46.68164 atomic mass units (u).

It's important to note that the calculation assumes the provided natural abundances are accurate and representative of the titanium isotopes on that planet.

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Answer:

Acetic acid CH3COOH

Hydrochloric acid HCl

Sulfuric acid H2SO4

Acetate CH3COO–

Ammonia

Explanation:

Hope i am right

Answer:

The surface of earth sits on plates that move over time because of the pressure build up underneath.When the pressure releases the pressure goes through the cracks of the plates (Or Earth) pushing them apart causing earthquakes and volcano eruptions.

Explanation: Science

According to molar concentration, 19.5 ml of  0.300 M NaOH solution is required to neutralize 32.5 cm³ of a 0.180 M HCI solution.

Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.

The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.

In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.

In the given problem, volume of NaOH is found out by the formula M₁V₁=M₂V₂ substitution in the given formula gives, V₁=0.180×32.5/0.3=19.5 ml.

Thus, 19.5 ml of  0.300 M NaOH solution is required to neutralize 32.5 cm³ of a 0.180 M HCI solution.

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Answer:

14.9 mol

Explanation:

To find the number of moles in a given mass of a sample of sodium chloride (NaCl), we can multiply the number of grams in the sample by the molar mass of sodium chloride, which is 58.44 g/mol.

871 g × (1 mol / 58.44 g)

= 871/58.44 mol

≈ 14.9 mol

Note that we rounded to 3 significant figures in the final answer because that is how many significant figures were given in the mass measurement of the sodium chloride sample.

The number of significant figures contained in the following values are as follows:

Significant figures are digits that is meaningful with respect to the precision of a measurement.

Significant figures are digits that is nonzero, followed by a nonzero digit, or (for trailing zeroes) justified by the precision of the derivation or measurement.

According to this question, the number of significant figures contained in the following values are as follows:

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A muffi n recipe calls for cream of tartar, or potassium hydrogen tartrate. The amount of cream of tartar that is required contains 2.56 ×10²³atoms of carbon. 0.42moles of potassium hydrogen tartrate is required

In the Global System of Units (SI), the mole represents the unit of material quantity. How many fundamental entities of a particular substance are present within an object a sample is determined by the quantity of that material. An elementary entity can be a single atom, a molecular structure, an ion, a charged particle pair, or a particle that is subatomic like a proton depending on the makeup of the substance.

For instance, despite the fact that the two substances have different volumes and masses, 10 moles of water because 10 moles of the chemical element mercury both contain the same quantity of stuff, because the mercury comprises exactly one particle for each molecule of water.

mole = 2.56 ×10²³/ 6.022×10²³

       = 0.42moles

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The insurance commissioner does not have the right to activate insurance companies' financial reserves.

The insurance commisioner is  soely in charge of the control of the bussiness of insurance in the company and seeks to ensure that prudent insurance policies are implemented by the government.

However, the insurance commissioner does not have the right to activate insurance companies' financial reserves.

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The experiment looks into how temperature impacts how quickly magnesium metal reacts with hydrochloric acid. The creation of hydrogen gas over time is used to determine the dependent variable, which is the reaction rate.

The experiment can be run at various temperatures to change the experiment's independent variable, which is the reaction mixture's temperature. Higher temperatures cause molecules to move more quickly, increasing the likelihood of reactant collisions and kinetic energy. By enabling more successful collisions between magnesium atoms and hydrochloric acid, can quicken the reaction and increase the amount of hydrogen gas produced. In contrast, it is anticipated that the reaction rate will be slower at lower temperatures since there will be less molecular mobility and fewer successful collisions.

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--The complete Question is, What is the effect of temperature on the rate of reaction between hydrochloric acid and magnesium metal?

The dependent variable in this experiment is the rate of reaction, which can be measured by monitoring the production of hydrogen gas over time. The independent variable is the temperature of the reaction mixture, which can be controlled and varied by conducting the experiment at different temperatures.--

The number of moles of the water produces by the 1.3 moles of O₂ is 1.00 mol of H₂O. The correct option is C.

The chemical equation is as :

2C₄H₁₀  +  13O₂  ---->  8CO₂ + 10H₂O

The moles of the O₂ = 1.3 moles H₂O

The molar mass of the O₂ = 32 g/mol

2 moles of the C₄H₁₀ produces the 10 moles of the water,

13 moles of O₂ produces the 10 moles of H₂O

The moles of the H₂O = (10/13) × 1.3

The moles of the H₂O = 1 mol

The number of moles of the water is 1 mol of the H₂O and the moles of the oxygen that is O₂ is the 1.3 moles.. Therefore, the correct option is C.

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Answer:

2K3PO4(aq) + 3MgCl2(aq) → Mg3(PO4)2(s) + 6KCl(aq)

Explanation:

K3PO4(aq) + MgCl2(aq)→ Mg3(PO4)2(s) + KCl(aq) (unbalanced)

2K3PO4(aq) + 3MgCl2(aq) → Mg3(PO4)2(s) + 6KCl(aq)

Reactants:       Products:

K: 3x2=6           K: 1x6=6

P: 1x2=2            P: 1x2=2

O: 4x2=8          O: 4x2=8

Mg: 1x3=3        Mg: 3x1=3

Cl: 2x3=6         Cl: 1x6=6

Therefore the equation is balanced. Hope this helps.

The alcohol product of the reduction of 2-methyl3-pentanone with  1. LiAlH₄ diethyl ether 2. H₂O is B ) racemic mixture.

The reduction of the 2 - methyl-3- pentanone with the LiAlH₄  diethyl ether is given as follows :

                                    1. LiAlH₄ diethyl ether

CH₃ - CH - C - CH₂ -CH₃   ---------------->               CH₃ - CH₂ - CH - CH₂ -CH₃

          |       ||                        2. H₂O                                  |          |

        CH₃   O                                                                  CH₃    OH

2 - methyl-3- pentanone                                       2 - methyl-3- pentanol

This compound is the optically inactive and thus, form the racemic mixture. the optically inactive means it does not rotate the plane polarized light.

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