Direction is not important when describing an object's motion.
O True
False

The volume of Kr-93 produced is 0.117 L

To determine the volume of Kr-93 produced when 1.10 g of U-235 undergoes fission, we need to use the ideal gas law equation:

PV = nRT

Where:

P = Pressure (1.0 atm)

V = Volume (to be determined)

n = Number of moles of Kr-93 (to be determined)

R = Ideal gas constant (0.0821 L·atm/(mol·K))

T = Temperature in Kelvin (25°C = 298 K)

First, we need to calculate the number of moles of U-235:

Given mass of U-235 = 1.10 g

Molar mass of U-235 = 235.043924 g/mol

Number of moles of U-235 = (given mass)/(molar mass)

= 1.10 g / 235.043924 g/mol

≈ 0.00468 mol

Since the fission reaction involves the same number of moles of Kr-93, we can say that the number of moles of Kr-93 produced is also 0.00468 mol.

Now, we can rearrange the ideal gas law equation to solve for V:

V = (nRT) / P

= (0.00468 mol) * (0.0821 L·atm/(mol·K)) * (298 K) / (1.0 atm)

≈ 0.117 L

Therefore, the volume of Kr-93 produced is approximately 0.117 L

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Answer:

So F=2N

Hope this helps.

Explanation:

P= F/A, where P is pressure, F is force, A is area.

So

P=F/A

0.5N/cm2 = F/4cm2 <--(do cross

2N=F multiplication,

4×0.5)

( And pls check on the unit of area u wrote, it should be (4cm2), not (4cm3) Unit of area is cm2.)

The null hypothesis (H0) is that the percentage of readers who own a laptop is equal to the reported percentage of 69%. The alternative hypothesis (Ha) is that the percentage of readers who own a laptop is different from 69%.

In statistical hypothesis testing, the null hypothesis represents the default assumption that there is no significant difference between the observed sample data and the expected population parameter. The alternative hypothesis, on the other hand, is the opposite of the null hypothesis and suggests that there is a significant difference between the observed sample data and the expected population parameter.

In this problem, the publisher reports that 69% of their readers own a laptop, which means the population proportion (p) is 0.69. The marketing executive wants to test if the actual percentage is different from the reported percentage. Therefore, we set up a two-tailed test. The null hypothesis (H0) is that the population proportion (p) is equal to the reported percentage (0.69). So, H0: p = 0.69. The alternative hypothesis (H1) is that the population proportion (p) is not equal to the reported percentage (0.69). So, H1: p ≠ 0.69.
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The theoretical yield of Fe2(SO4)3 if 20.00 g of FePO4 reacts with an excess of Na2SO4 is 26.52g.

A chemical equation is an expression that represent the chemical reaction between two or more substances. It consists of the chemical formulas of the reactants in and the products along with the physics state of the reactants and the products solid liquid gas etc. And the symbol that denoted the type of reaction that is talking please I'll eat you double arrow of the film visible reaction the number of the atoms of each element in the reactants and products must be the same on the both side of the equation.

1) Chemical equation:

2FePO4 + 3Na2SO4 → Fe2(SO4)3 + 2Na3PO4

2) Theoretical molarity ratios:

2 mol FePO4 : 3 mol Na2SO4 : 1 mol Fe2(SO4)3 : 2 mol Na3PO4

3) Convert 20.00 g of FePO4 into number of moles

number of moles = mass in grams / molar mass

molar mass of FePO4 = 150.82 g/mol

numer of moles = 20.00 g / 150.82 g/mol = 0.1326 mol FePO4

4) Proportionality

1 mol Fe2(SO4)3                x
----------------------- =  ------------------------
2 mol FePO4           0.1326 mol FePO4

Solve for x:

x = (0.1326 / 2) * 1 mol Fe2(SO4)3 = 0.0663 mol Fe2(SO4)3

5) Convert 0.0663 mol Fe2(SO4)3 into grams

mass in grams = number of moles * molar mass

molar mass Fe2(SO4)3 = 399.88 g/mol

mass = 0.0663 mol * 399.88 g/mol = 26.51 g

Depending on the numbers of the decimal to digits used by one or otherwise you might obtained 26.52 instead 26.51, that's differences does not count.

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Answer:

2,3–dimethylpentane

Explanation:

To know which option is correct, we shall determine the name of the compound.

To obtain the name of the compound, do the following:

1. Determine the longest continuous carbon chain. This gives the parent name of the compound.

2. Identify the substituent group attached to the compound.

3. Locate the position of the substituent group by giving it the lowest possible count.

4. Combine the above to obtain the name of the compound.

Now, we shall determine the name of the compound as follow:

1. The longest continuous carbon chain is 5. Thus, the parent name of the compound is pentane.

2. The substituent group attached is methyl (–CH₃)

3. There are two methyl group attached to the compound. One is located at carbon 2 and the other at carbon 3.

4. Therefore, the name of the compound is:

2,3–dimethylpentane

None of the options are correct.

Answer:

False

Explanation:

Answer:

:0

Explanation:

Answer:

Pure substances are mostly homogeneous in nature containing only one type of atom or molecule.

The definition of a mixture is a combination of different things that are not chemically bonded

A heterogeneous mixture contains two or more ingredients or phases.

A homogeneous mixture is a mixture of substances blended so thoroughly that you cannot see individual substances.

Therre are thousands of ingredients

Explanation:

Pure substances have a single type of ingredient. Therefore, option D is correct.

Pure substances can be described as such as elements that cannot be broken down further into simple substances that have a single type of atom in the whole composition.

A pure substance can be defined as two or more elements that are combined chemically and have a set composition such type of pure substance is known as a compound.

A mixture can be demonstrated as made up of more than two different substances that are just physically combined. A mixture of the ingredients can be easily separated into original components.

The non-uniform composition of a heterogeneous mixture throughout the mixture while the uniform composition of the substance in a homogeneous mixture.

Therefore, the pure substance has a fixed composition a single type of ingredient.

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Answer

Molarity (C) = 0.41 mol/L

Explanation

Given:

Number of moles = 3.5 moles

Volume = 8.50 L

Required: Molarity of the solution

Solution

To solve for molarity, you can use the following equation

Where C is the concentration or molarity, n is the number of moles and V is the volume of the solution.

C = 3.5 mol/8.50 L

C = 0.41 mol/L

According to stoichiometry and given chemical equation , 3.5  moles zinc nitrate are obtained from 7 .0 moles of silver nitrate.

It is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.

Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.

In the given example as 2 moles of silver nitrate give 1 mole of zinc nitrate

∴7 moles of silver nitrate will give 7×1/2=3.5 moles of zinc nitrate.

Thus,  3.5  moles zinc nitrate are obtained from 7 .0 moles of silver nitrate.

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Answer: The answer is D,

Answer:

They may have different phenotypes because of differences in their environments, such as nutrition and healthcare. Why might genetically identical twins have different phenotypes?  Any genes on the same chromosome could be linked genes, whereas only genes on sex chromosomes can be sex-linked genes.

Explanation:

Due to the effects of the environment, genetically identical twins might have different phenotype.

The qualities or visible characteristics of an organism are its phenotype. It depends on how the environment and the genotype, or genetic code, of the organism interact.

Although human monozygotic twins as well as other genetically identical species may share startling physical similarities, they frequently differ in key characteristics, such as complicated diseases. The effects of the environment have generally been blamed for this variance across organisms with essentially identical chromosomal DNA sequences.

Therefore, due to the effects of the environment, genetically identical twins might have different phenotype.

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The conditions for a standard electrochemical cell. select one or more : pressure of 1 atm temperature of 298 k solution concentrations of 1 M.

The electrochemical cell is the cell that is capable of generating the electrical energy from the chemical reactions or by the use of the electrical energy to cause the chemical reaction. The conditions for a standard electrochemical cell. select one or more : pressure of 1 atm temperature of 298 k solution concentrations of 1 M.  

There are the two types of the electrochemical cells is as follows : the galvanic called the electrolytic cells. the galvanic cell is also called as the voltaic cell.

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The mass of a NaCl solution that is required to prepare 0.40 L of a 0.75 M solution is 17.55g. Details about mass can be found below.

The mass of a substance can be calculated by multiplying the number of moles by its molar mass.

However, the number of moles of a solution must be initially calculated by using the following formula:

molarity = no of moles ÷ volume

no of moles = 0.75 × 0.40

no of moles = 0.3 moles

mass of NaCl = 0.3 × 58.5 = 17.55g

Therefore, the mass of a NaCl solution that is required to prepare 0.40 L of a 0.75 M solution is 17.55g.

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Answer:

b because  i said so

Explanation:

Therefore, 1000 grams of  CaBr₂, is equivalent to 4.63 moles of \(CaBr_2\).  

The number of moles of  CaBr₂, in 1000 grams, we need to use the molecular formula of CaBr₂, which is CaBr₂,.

The molecular formula of CaBr₂, is CaBr₂,, which tells us that there is one calcium (Ca) atom, two bromine (Br) atoms, and two bromine (Br) atoms in one molecule of  CaBr₂,.

The molecular weight of CaBr₂, is the sum of the atomic weights of all the atoms in the molecule. The atomic weight of calcium (Ca) is 40.08 g/mol, the atomic weight of bromine (Br) is 79.90 g/mol, and the atomic weight of bromine (Br) is 79.90 g/mol.

Therefore, the molecular weight of CaBr₂, is:

40.08 g/mol + 79.90 g/mol + 79.90 g/mol = 219.78 g/mol

To convert the mass of CaBr₂, to moles, we need to divide the mass by the molecular weight:

Moles of  CaBr₂, = Mass of CaBr₂, / Molecular weight of CaBr₂,

1000 g = 1000 g / 219.78 g/mol

Moles of  CaBr₂, = 4.63 mol

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Answer:

If mass remains the same while the volume of a substance changes, the density of the substance will also change.

Answer:

BELOW

Explanation:

If mass remains the same while the volume of a substance decreases the density of the substance will increase.

Einstein believed that forming a problem is more important than solving it because identifying the right issue to address is the foundation of finding a meaningful solution.

In his perspective, the process of defining a problem helps us understand its core components, thereby allowing us to focus our efforts on what truly matters. If we invest time in framing the problem correctly, we increase the likelihood of developing an effective solution. A well-defined problem guides our thought process and ensures that we do not waste time on irrelevant aspects, it also helps us establish the scope of the issue, thereby enabling us to consider different perspectives and potential solutions. By prioritizing the formation of the problem, we can better target our resources and energy towards achieving a purposeful outcome.

Moreover, Einstein believed that a truly groundbreaking solution could only emerge when the problem was thoroughly understood. By focusing on problem formation, we can also gain insights into the underlying patterns and principles that govern the issue, which in turn, can lead to innovative approaches to tackle it. In conclusion, Einstein's emphasis on forming a problem over solving it highlights the significance of thoroughly understanding an issue before attempting to resolve it. This approach ensures that our efforts are directed towards the most meaningful and impactful solutions.

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Answer:

A) It shows how electrons are distributed in the Shells of an Iron atom.

Explanation: Took the test on Edge

To see the number of atoms of an element in a given molecule we need to multiply stoichiometry to the number that is written on the foot of the element that is stoichiometry. Therefore, the correct option is option A.

Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit.

In the nucleus, proton and neutron are present. Electron has -1 charge while proton has +1 charge. Neutron is neutral that is it has no charge. So overall the charge of nucleus is due to only proton, not by neutron. The given model shows how electrons are distributed in the shells of an iron atom.

Therefore, the correct option is option A.

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The two types of inner transition metals are the lanthanides and the actinides. The lanthanides consist of the elements from cerium (atomic number 58) to lutetium (atomic number 71). The actinides consist of the elements from thorium (atomic number 90) to lawrencium (atomic number 103).

The lanthanides are also called the rare earth elements, and they tend to have similar chemical properties due to their close proximity on the periodic table. They are all silvery-white metals and are often used in industrial and manufacturing processes.
The actinides are also silvery-white metals, but they tend to be more radioactive than the lanthanides and have less predictable chemical properties. They are generally only found in small amounts in nature, and are mostly produced synthetically for research and industrial uses.

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Answer:

A. 1s²2s²

B. 1s²

C. 1s²

D. 1s²2s²2p⁶

Explanation:

The valency electron is the outer electron of an element. The valency electron resides in the outermost region of the shell.

Using the general configuration for the first 20 elements 2 8 8 2 the valency electrons can be identified.

A. 1s²2s²2p⁶3s² . The valency electron here are 2p⁶ and 3s² . Removing the valency electron we have 1s²2s²

B. 1s² 2s² 2p⁶. After removing the valency electron the configuration will be 1s².

C.1s²2s². After removing the valency electron the configuration will be 1s²

D.1s²2s²2p⁶3s¹. Removing the valency electron the electron configuration will be 1s²2s²2p⁶

Answer: velocity

Explanation:

The statement that is most correct regarding the common-ion effect is: (a) The solubility of a salt MA is decreased in a solution that already contains either M+ or A-.

The common-ion effect states that the solubility of a salt in a solution containing another salt with a common ion is lowered. This occurs because the concentration of one of the ions in the solution is already present, as a result of the common ion, reducing the concentration of the ion of the salt that is being dissolved.

This can be explained by the Le Chatelier's principle where the equilibrium shifts in a direction that helps relieve any imposed stress or disturbance. When a common ion is added to a solution, it suppresses the dissociation of the salt that is being dissolved and shifts the equilibrium of the reaction towards the undissociated solid. This results in a decrease in the solubility of the salt in the solution.In the case of option (b), common ions do not alter the equilibrium constant. However, they do change the solubility of the salt. In the case of option (c), the common-ion effect applies to all types of ions, including unusual ions like SO32-. Finally, in option (d), the solubility of a salt MA is decreased when either M+ or A- is present in the solution as the common ion. Therefore, option (a) is the most correct statement regarding the common-ion effect.

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Answer:

c

Explanation:

Seven squares represent seven f-subshell orbitals with magnetic quantum number values of -3, -2, -1, 0, +1, +2, +3.

The paramagnetic nature is represented by a single electron in the seventh orbital.

This quantum number describes the spatial orientations of electrons.

It defines the orientation of an orbital in space of a given energy(n) and shape using magnetic quantum numbers (l). It divides the subshell into orbitals made up of electrons.

It is represented by the symbol ml. Each subshell contains 2l+1 orbitals. The value of lies between -l and +l, where l is the azimuthal quantum number.

Orbitals with l=0, s-subshell, and ml = 0 = 1

P-subshell ml = -1, 0, +1 = 3 orbitals for l=1.

When l=2, the d-subshell ml = -2, -1, 0, +1, +2 = 5 orbitals.

For l=3, the f-subshell ml are -3, -2, -1, 0, +1, +2, +3 = 7 orbitals.

These orbitals are represented as squares in orbital notations of an atom, with electrons represented by upward and downward arrows.

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Answer:

The skin

Explanation:

The skin is the largest organ of the body. The skin and its derivatives (hair, nails, sweat and oil glands) make up the integumentary system. One of the main functions of the skin is protection. It protects the body from external factors such as bacteria, chemicals, and temperature.

Answer:

3) 1

4) 0.2

5) 2

6) 1

7) 0.2

Explanation:

3)

The molarity of a substance is defined as the number of moles of the substance divided by how many liters the solution is. NaOH has a molar mass of about 40 grams, meaning that 10 grams of it would be 0.25 moles. 0.25/0.25= a molarity of 1.

4)

CO2 has a molar mass of just about 44 grams, meaning that 44 grams of it would be about a mole. 5000mL of solution is 5 liters, meaning that the molarity of this solution would be 1/5=0.2.

5)

HF has a molar mass of about 20, meaning that 20 grams of it is about a mole. 1/0.5=2M.

6)

Calcium flouride has a molar mass of about 78 grams, meaning that 156 grams is about two moles. 2000mL is 2 liters, meaning that this has a molarity of 2/2=1.

7)

Glucose has a molar mass of about 180 grams, meaning that 360 grams of it would be about 2 moles. 2/10=0.2.

Hope this helps!

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88w88 *what have I caught here?

As there are 1,000,000 kg in 1 Mg, we must multiply by 1,000,000 to convert from Mg (megagrams) to kilogrammes. Therefore:

8.12 × 107 kg or 81.2 Mg is equal to 81.2 x 1,000,000 kg.

8.12 x 107 kilos, or in scientific notation, are contained in 81.2 Mg.

, I apologize for my mistake in the previous response. The conversion from Mg to kg is indeed done by multiplying by 1,000,000. Thank you for providing the correct calculation and explanation. The answer is:

81.2 Mg = 81.2 x 1,000,000 kg = 8.12 x 10^7 kg

Expressed in scientific notation, there are 8.12 x 10^7 kilograms in 81.2 Mg.

8.12 x 107 kilos, or in scientific notation, are contained in 81.2 Mg.

8.12 x 107 kilos, or in scientific notation, are contained in 81.2 Mg.

learn more about kilogrammes here:

https://brainly.com/question/5305768

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Conversion of Ethyne into Ethanol:

The ethanal can be prepared by the ethyne by treating the ethyne with mercuric sulphate in presence of acid. First the mercury attacks on the reactant ethyne and forms a cyclic structure. Then water attacks on this cyclic structure forming a mercury cation. Then by the removal of hydride alcohol forms.

Hydration of Ethyne:

Alkynes readily combine with water in the presence of acid (usually sulfuric acid) and mercury(II) salts (usually the sulfate is used) to form carbonyl compounds, in a process known as Kucherov's reaction. In the case of acetylene (ethyne) the product is acetaldehyde (ethanal), while other alkynes form ketones.

Answer:

4 ClO-

Explanation:

Bond length ∝ 1/ Bond order

Bond order of ClO − =1,

Bond order of ClO 2− =1.5,

Bond order of ClO 3− =1.66 ,

Bond order of ClO 4− =1.75.

Thus the order of bond length is

ClO 4− <ClO3− <ClO2−

<ClO −

Answer:

Marie Curie

Explanation:

Physics in 1903

Chemistry in 1911

Wow

https://www.nobelprize.org/prizes/physics/1903/marie-curie/biographical/

Answer:

Marie Curie was a physicist and chemist who was awarded the Nobel Prize for work in understanding radioactivity and the discovery of polonium.n: