Which among the following represents a set of isotopes? Atomic nuclei that contain:
I) 5 protons and 5 neutrons
II) 5 protons and 6 neutrons
III) 6 protons and 6 neutrons
IV) 6 protons and 5 neutrons
V) 5 protons and 7 neutrons

Answer:

(e) 1

Explanation:

Each atom has some energy levels and each energy level requires an electron to have certain amount of energy to reside in that energy level. Similarly, in order to excite the hydrogen atoms to a state n =6, its electrons must be provided a certain amount of energy that is constant. This energy is provided in form of photons. These photons have a constant wavelength as a result of constant energy. So, when these electrons go back to the ground state, they emit photons of same wavelength to release the energy they absorbed. Hence, only 1 wavelength is produced when atoms relax to their ground state from n = 6.

Therefore, the correct answer will be:

(e) 1  

It's important to know that the reaction must have the total mass involved before and after due to the law of conservation of mass. This means that the total mass number of the left side of the reaction must be equal to the right side. So, we have the following

Notice that 235 is the mass number of U, 1 is the mass number of the neutron, X represents the mass number of the unknown element, 141 represents the mass number of Ba, and 3 represents the mass number of three neutrons. This means X should have a mass number of 92, which is the element Kr.

Therefore, the mass number is 92 and the chemical symbol is Kr.

*sorry I can't give a full explanation.*

g = 9.8 m/s²

w = m*g

Weight of cat: 55 N = m*9.8

m = 5.61 kg

Weight of dog: 110 N = m*9.8

m = 11.22 kg

There is gravitational potential energy (GPE) acting on the cat since it's at the very top.

GPE of cat = m*g*h = 5.61*9.8*2 = 109.96 J

GPE of dog = m*g*h = 11.22*9.8*0 = 0 J (it's 0 m height because it's on the floor instead of in the tree)

But, if the dog was also 2 m up in the tree, its GPE would be 219.91 J.

As you can see, it's GRAVITATIONAL potential energy is bigger than the cat because it weighs more. Generally, if you were just trying to find the force which is w = m*g (since weight is a force), you would see that the bigger the mass, the bigger the force, and gravity stays the same.

Hope this helped

Mass Ag₂O needed = 107.416 g

Given

100 g Ag

Required

mass of Ag2O

Solution

Proust stated the Comparative Law that compounds are formed from elements with the same Mass Comparison so that the compound has a fixed composition of elements

mass of Ag in Ag2O :

= ((2 x Ar Ag)/molar mass Ag2O )x mass Ag2O

\(\tt mass~Ag=\dfrac{2.Ar~Ag}{MW~Ag_2O}\times mass~Ag_2O\)

Ar Ag : 107,8682 g/mol

MW Ag₂O = 231,735 g/mol

Input the value :

mass Ag₂O=(mass Ag x MW Ag₂O) : (2 x Ar Ag)

mass Ag₂O = (100 g x 231,735 g/mol) : ( 2 x 107,8682 g/mol)

mass Ag₂O = 107.416 g

Answer:

all of em

Explanation:

they got mouths right

Answer:

Sometimes peoples like to say that atom is like a cell in living things,is it true?comment below,letss goo!!

Explanation:

A greek philosopher known as Democritus was the first to consider the idea that matter is made up of small particles ,about 400BC.

Since there was no experimental evidence to support his idea,it was not accepted.

About 2000 years later an English man called John Dalton revived the discussion.He used experimental evidence to support his idea to convince people that matter is made up of particles called atoms.It accepted!.

An English man called John Dalton revived the discussion.He used experimental evidence to support his idea to convince people that matter is made up of particles called atoms.It was accepted ,he conclude the following theories:

The symbol that represents a solution in a chemical reaction is "(aq)."

In chemistry, "(aq)" stands for "aqueous," which refers to a solution where the solute is dissolved in water. A solution is a homogeneous mixture composed of a solvent (in this case, water) and a solute (the substance being dissolved).

When a chemical species is in an aqueous solution, it means that it is dissolved and uniformly dispersed in water molecules. The "(aq)" symbol is typically used to indicate this state of the substance in a chemical equation or reaction.

For example, consider the equation:

NaCl(aq) + AgNO₃(aq) → AgCl(s) + NaNO₃(aq)

In this equation, NaCl(aq) and AgNO₃(aq) both represent substances that are dissolved in water. The "(aq)" notation indicates that these substances are in the form of an aqueous solution.

On the other hand, the symbols "(l)," "(s)," and "(g)" represent different states of matter. "(l)" represents a liquid, "(s)" represents a solid, and "(g)" represents a gas.

So, to summarize, the symbol "(aq)" is used to indicate that a substance is in the form of an aqueous solution, specifically dissolved in water, in a chemical reaction.

for more questions on solution

https://brainly.com/question/28564792

#SPJ8

1. The actual yield is less than the theoretical yield. 2. The percent yield is approximately 83%. 3. There was a loss of product during the reaction. 4. The reaction did not go to completion. 5. The product is not pure.

To address your question regarding the reaction that produces 14.2 grams of a product with a theoretical yield of 17.1 grams, we need to consider the following terms:

1. Actual yield: This refers to the amount of product that is actually produced during a chemical reaction, which in this case is 14.2 grams.
2. Theoretical yield: This is the maximum amount of product that could be formed from a chemical reaction based on stoichiometry, and in this case, it is 17.1 grams.

Now, let's analyze the given statements to determine which are true:

A. The reaction has a 100% yield: This statement is false, as the actual yield (14.2 grams) is less than the theoretical yield (17.1 grams).
B. The reaction has a yield of less than 100%: This statement is true, as the actual yield is less than the theoretical yield.
C. The reaction has a yield of more than 100%: This statement is false, as the actual yield is less than the theoretical yield.

So, the correct answer is that the reaction has a yield of less than 100%.

To know more about theoritical yield visit:
https://brainly.com/question/1446190

#SPJ11

Answer:

a synthesis reaction occured when the liquids were mixed

The net ionic reaction for MnBr₂ +  Na₂SO₃ is  Mn²⁺(aq) + SO₃²⁻(aq) → MnSO₃(s).

The net ionic reactiion for MnBr₂ + Na₂SO₃ can be determined using the following steps:
1. Write the balanced molecular equation:
MnBr₂(aq) +  Na₂SO₃(aq) → MnSO₃(s) + 2NaBr(aq)
2. Write the total ionic equation by dissociating the strong electrolytes:
Mn²⁺(aq) + 2Br⁻(aq) + 2Na⁺(aq) + SO₃²⁻(aq) → MnSO₃(s) + 2Na⁺(aq) + 2Br⁻(aq)
3. Identify and remove the spectator ions (those that appear on both sides of the equation):
Mn²⁺(aq) + 2Br⁻(aq) + 2Na⁺(aq) + SO₃²⁻(aq) → MnSO₃(s) + 2Na⁺(aq) + 2Br⁻(aq)
Spectator ions: 2Na⁺(aq) and 2Br⁻(aq)
4. Write the net ionic equation by removing the spectator ions:
Mn²⁺(aq) + SO₃²⁻(aq) → MnSO₃(s)
So, the net ionic reaction for MnBr₂ + Na₂SO₃ is Mn²⁺(aq) + SO₃²⁻(aq) → MnSO₃(s).

To learn more about ionic equation https://brainly.com/question/19705645

#SPJ11

Therefore, even if the sun were burning methane, it would run out of fuel within a relatively short period of time.

The sun is an enormous star that provides Earth with the heat and light needed to sustain life. It has a mass of 2 x 10^30 kg and produces energy at a rate of 3.9 x 10^26 watts.

If the sun's energy source were ordinary combustion of a chemical fuel such as methane, it would last about 5,000 years.

Before we can calculate how long the sun would last if it relied on ordinary combustion of methane, we must first understand how the sun generates its energy. Nuclear fusion is the process that occurs within the sun that generates its energy.

The sun's core is extremely hot, with temperatures reaching 15 million degrees Celsius, which causes hydrogen atoms to fuse together, forming helium.

This process releases a significant amount of energy in the form of light and heat. This nuclear fusion process has been ongoing for approximately 4.6 billion years and will continue for another 5 billion years, according to scientists.

If the sun's energy source were ordinary combustion of a chemical fuel such as methane, it would last about 5,000 years.

This is a minuscule amount of time compared to the billions of years the sun has already been in existence. The reason for this is that nuclear fusion is a far more efficient energy generation method than chemical combustion. It releases millions of times more energy per atom than ordinary chemical reactions.

to know more about combustion visit:

https://brainly.com/question/15117038

#SPJ11

Answer:

Shear

Explanation:

Answer:

Aqua regia is a corrosive, fuming yellow solution that is a 1:3 mixture of concentrated nitric and hydrochloric acids.

Aqua regia is a mixture of hydrochloric acid (HCl) and nitric acid (HNO3) at a ratio of either 3:1 or 4:1. It is a reddish-orange or yellowish-orange fuming liquid. The term is a Latin phrase, meaning "king's water". The name reflects the ability of aqua regia to dissolve the noble metals gold, platinum, and palladium.

Option (d) is correct. A magnetic field is produced by a stream of electrons flowing through a wire that is coiled around an iron core.

Magnetic field is defined as a vector field that describes the magnetic influence on moving electric charges, electric currents and magnetic materials. It is said that a moving charge in a magnetic field experiences a force perpendicular to its own velocity and to the magnetic field. It is the portion of space near a magnetic body or a body carrying an electric current within which magnetic forces due to the body or current can be detected. It is a vector field in the electric current or changing electric field in which magnetic forces are observable. It force moving electrically charged particles in a circular or helical path.

To learn more about Magnetic field

https://brainly.com/question/26257705

#SPJ4

Answer:

Given:

Mass of Ca(OH)2 = 65.0 g

Molar mass of Ca(OH)2 = 74.09 g/mol

2 moles of HCl reacts with 1 mole of Ca(OH)2

Solution:

Number of moles of Ca(OH)2 = mass / molar mass = 65.0 g / 74.09 g/mol = 0.877 mol

From the balanced chemical equation, we see that 1 mole of Ca(OH)2 reacts with 2 moles of HCl to form 1 mole of CaCl2 and 2 moles of H2O. Therefore, 0.877 mol of Ca(OH)2 reacts with 2 × 0.877 = 1.754 moles of HCl.

1 mole of Ca(OH)2 produces 1 mole of CaCl2, so 0.877 mol of Ca(OH)2 will produce 0.877 mol of CaCl2.

Therefore, 0.877 moles of CaCl2 will be formed if you start our reaction with 65.0 grams of Ca(OH)2.

Even one gram of a pure element is known to have an enormous number of atoms when working with particles at the atomic (or molecular) level. The mole idea is frequently applied in this situation. Here the number of moles is 0.877.

The mole idea is a useful way to indicate how much of a substance there is. A mole is the amount of a substance that includes precisely 6.022 × 10²³ of the substance's "elementary entities," according to the science of chemistry.

Popularly known as the Avogadro constant, the quantity 6.022 × 10²³ is frequently represented by the letter "NA". Atoms, molecules, monoatomic/polyatomic ions, and other particles (such electrons) are examples of the elementary entities that can be represented in moles.

Number of moles = Given mass / Molar mass

Molar mass of Ca(OH)₂ = 74.093 g / mol

n = 65.0 /  74.093 = 0.877 moles

To know more about mole concept, visit;

https://brainly.com/question/29367909

#SPJ2

Answer:

Boyle's most famous discovery had to do with how the pressure and volume of gases relate, either this or he discovered the volume of a gas decreases with increasing pressure...

Explanation:

...

There are 118 elements on the periodic table.

Atp links endergonic and exergonic reactions.

In chemical thermodynamics, an exergonic reaction is a chemical reaction where the amendment in the free energy is negative (there may be an internet unleash of free energy).

This indicates a spontaneous reaction if the system is closed and initial and final temperatures are the same. For processes that crop up in a very closed system at constant pressure and temperature, Gibbs free energy is used,

whereas the Helmholtz energy is relevant for processes that take place at constant volume and temperature. associate degree reaction occurring at a constant temperature while not the input of electrical or gauge boson energy is exergonic, in step with the second law of thermodynamics. An example is a cellular respiration

learn more about exergonic reaction here;  https://brainly.com/question/5450991

#SPJ4

Answer:

Its when like two pure substances are like combined into one.

Explanation:

A sodium bicarbonate aqueous solution can be used to react with the combination. As a result, lauric acid undergoes deprotonation and transforms into the water-soluble salt of sodium laurate.

Alpha-naphthol is insoluble and acetone is soluble in cyclohexane. Alpha-naphthol can be taken out of the cyclohexane acetone mixture by filtering it.

The extracted coconut oil was boiled in a water bath with sodium hydroxide present. This separated the lauric acid from the glycerin, converting the coconut oil into two different layers of lauric acid. At room temperature, lauric acid is a white solid that reacts quickly with oxygen.

To know more about lauric acid visit:-

https://brainly.com/question/14932624

#SPJ1

Considering the definition of atomic mass, isotopes and atomic mass of an element, sb121 has a percent natural abundance of 0.5726 or 57.26% and sb123 has a percent natural abundance of 0.4284 or 42.84%.

The atomic mass is obtained by adding the number of protons and neutrons in a given nucleus of a chemical element.

Isotopes are the chemical elements in which atomic numbers are the same, but the number of neutrons is different.

The atomic mass of an element is the weighted average mass of its natural isotopes.

This is, the atomic masses of elements are usually calculated as the weighted average of the masses of the different isotopes of each element, considering the relative abundance of each of them.

In this case, antimony has two naturally occuring isotopes, sb121 and sb123. You know:

The average mass of antimony is expressed as:

121.7601 u= 120.9038 u x + 122.9042 u× (1 -x)

Solving:

121.7601 u= 120.9038 u x + 122.9042 u - 122.9042 u x

121.7601 u - 122.9042 u= 120.9038 u x - 122.9042 u x

(-1.1441 u)= (-2.0014) x

(-1.1441 u)÷ (-2.0014)= x

0.5726= x or 57.26%

So, 1 -x= 1- 0.5716 → 1-x= 0.4284 or 42.84%

Finally, sb121 has a percent natural abundance of 0.5726 or 57.26% and sb123 has a percent natural abundance of 0.4284 or 42.84%.

Learn more about average atomic mass:

brainly.com/question/4923781

brainly.com/question/1826476

brainly.com/question/15230683

brainly.com/question/7955048

#SPJ1

The covalent phosphodiester bonds of DNA are hydrolyzed by restriction enzymes, leaving either "sticky/cohesive" ends or "blunt" ends.

By incubating the target DNA molecule with restriction enzymes, which detect and bind certain DNA sequences and cleave at specified nucleotides either inside or outside of the recognition sequence, restriction digestion is carried out.

An isolated bacterial protein known as a restriction enzyme cleaves DNA at sequence-specific locations to create DNA fragments with a known sequence at either end. Restrictions enzymes are crucial for numerous laboratory processes, including recombinant DNA technology and genetic engineering.

At the particular restriction site, DNA bonds between the 3′ OH of one nucleotide and the 5′ phosphate of the following one are cleaved by restriction enzymes.

In order to prevent the plasmid vector from ligating with itself and to verify that the inserted gene is oriented correctly, two separate restriction enzyme sites might be used.

A) #1 5′ - CGTGATCTCGATTCGCTAGTAACGTT - 3′

         3′ - GCACTAGAGCTAAGCGATCATTGCAA - 5′

    #2 5′ - TCATGAATTCCTGGAATCAGCAAATGCA - 3′

         3′ - AGTACTTAAGGACCTTAGTCGTTTACGT - 5′

B) Recognition sites:

#1 5′ - GAATTC - 3′

    3′ - CTTAAG - 5′

#2 5′ - GAATTC - 3′

    3′ - CTTAAG - 5′

C) Cleavage sites:

#1 5′ - G    AATTC - 3′

    3′ - CTTAA    G - 5′

#2 5′ - G    AATTC - 3′

    3′ - CTTAA    G - 5′

The correct and complete question is in the image.

Learn more about Restriction enzymes here:

https://brainly.com/question/13944056

#SPJ4

Answer:

1.238 years will it take

Explanation:

The isotope decay of an atom follows the equation:

Ln[A] = -kt + ln[A]₀

Where [A] could be taken as the amount of the isotope after t years

[A] = 1.00mg

t = ?

k is the decay constant; k = ln2 / Half-life

k = ln 2 / 2.86 years = 0.2424 years⁻¹

[A]₀ is the initial amount of the isotope = 1.35mg

Replacing:

ln1 = -0.2424years⁻¹*t + ln 1.35

0.2424years⁻¹*t = ln 1.35

t =

Answer:

-94 feet.

Explanation: