What is the binding energy per nucleon? Why is the binding energy per nucleon, rather than per nuclide, used to compare nuclide stability?

Possible answer could be 900 or 450.

Answer:

The salts which are obtained by the partial replacement of ionizable hydrogen atoms of a polybasic acid by a metal or an ammonium ion are called acidic salts.

H2SO4 + NaOH → NaHSO4 +H2O

Answer:

Acid salts are a class of salts that produce an acidic solution after being dissolved in a solvent.

Explanation:

The distance between the earth and star = 8 ✕ (9.46 ✕ 1012) = 7.6 ✕ 1013 km.

What is exoplanet?

Every planet in our solar system orbits the Sun. Planets known as exoplanets orbit other stars. It is quite challenging to directly observe exoplanets with telescopes. They are hidden by the bright light from the stars they orbit.

It is challenging to give distances in kilometers for many celestial objects since they are so far away from the earth, such as galaxies or stars.

How far light may travel in a year is measured in large units called light-years. The vast distances are therefore expressed in terms of light-years.

9.46 x 1012 kilometres make up a light year.

In other words, if a star is eight light-years away, light would travel that distance in eight years. This is how the distance between a star and the earth is calculated.

Therefore, the distance between the earth and the star is 8 (9.46 1012) = 7.6 1013 kilometers.

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Assuming that the capacitors are distinct and not identical, there are eight possible combinations of capacitance that can be produced using all three capacitors in a circuit.

This is because each capacitor can either be included or excluded from the circuit, resulting in two possibilities for each capacitor. With three capacitors, there are 2x2x2 = 8 possible combinations.

For example, if C1 = 1μF, C2 = 2μF, and C3 = 3μF, the eight possible combinations would be 1μF, 2μF, 3μF, 1+2=3μF, 1+3=4μF, 2+3=5μF, 1+2+3=6μF, and no capacitor connected.

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Answer:

I think its 16 hope it helps

Explanation:

Answer:

The balance equation of Ca(OH)2 + HCl ---> CaCl2 + H2O​

is

Ca(OH)2(s) + 2HCl(aq) ---> CaCl2(aq) +2H2O​ (l) (balanced equation)

Answer!

After 2 years, 1.986 g of a radioisotope material remains from a sample of the original mass of 2g, what is the half-life of the sample? - Radioactive decay occurs according to the formula:

A = A0 * exp(-ln(2) * t/T1/2)

The Original activity or mass A0 will decay to be A after time t where T1/2 is the decay time or half-life. If you fill in the values for A, A0 and t (= 2 years) you will end up with a value of approximately 188 years for the half-life.

Answer: 27 electrons

copper has 29 protons in its nucleus. atoms can only lose or gain electrons. so because copper has 29 protons and will always have 29 protons, and the Cu2+ ion has a positive charge, there are more protons than electrons.

that means there should be 2 less electrons than protons. that leaves us with 29 protons and 27 electrons.

hope this helps :)

almost every lab uses chemicals of some sort, chemical safety rules are a must. Following these policies helps employees avoid spills and other accidents, as well as damage to the environment outside of the lab.

Explanation:

We need to follow these because working in the laboratory is more dangerous and to avoid this we need to Know the precautions and dangers governing the lab to prevent accident

Answer: It will give up electrons, forming a positive ion.

During bonding, strontium atom will give up electrons, forming a positive ion.

STRONTIUM:

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After one day, approximately 8.67mg of the sample will be remaininga) The function that models the sample of Technetium-99 is given by

f(t) = P₀e^(-kt)

Where,P₀ = initial quantity = 100mgk = decay constantt = timef(t) = remaining quantity after t time.

A half-life of 6 hours is given. The decay constant can be found using the half-life formula:

T½ = (ln 2)/k6

= (ln 2)/kk

= (ln 2)/6f(t)

= P₀e^(-kt)f(t)

= 100e^(-0.1155t)mg

b) After one day, 24 hours = 4 half-lives Remaining amount,

f(t) = P₀e^(-kt)f(24)

= 100e^(-0.1155 × 24)

= 100e^(-2.772)

≈ 8.67mg

After one day, approximately 8.67mg of the sample will be remaining. The function that models the sample is

f(t) = 100e^(-0.1155t), where t is time in hours and f(t) is the remaining quantity in milligrams.

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After one day, approximately 8.67mg of the sample will be remaininga) The function that models the sample of Technetium-99 is given by

f(t) = P₀e^(-kt)

Where,P₀ = initial quantity = 100mgk = decay constantt = timef(t) = remaining quantity after t time.

A half-life of 6 hours is given. The decay constant can be found using the half-life formula:

T½ = (ln 2)/k6

= (ln 2)/kk

= (ln 2)/6f(t)

= P₀e^(-kt)f(t)

= 100e^(-0.1155t)mg

b) After one day, 24 hours = 4 half-lives Remaining amount,

f(t) = P₀e^(-kt)f(24)

= 100e^(-0.1155 × 24)

= 100e^(-2.772)

≈ 8.67mg

After one day, approximately 8.67mg of the sample will be remaining. The function that models the sample is

f(t) = 100e^(-0.1155t), where t is time in hours and f(t) is the remaining quantity in milligrams.

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The pair of elements which are non-metals and at the same time; gases at room temperature and normal atmospheric pressure are as follows:

N2, O2, He, Ar

An element is a substance which cannot be split into simpler units by any ordinary process.

Some few examples of elements include:

Hydrogen

Helium

Lithium

Beryllium

Boron

Carbon

Nitrogen

Oxygen

Fluorine

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The new pressure of the gas after doubling the temperature and halving the volume is 4 atm. The correct answer is (d).

The ideal gas law is expressed as:

PV = nRT

where P is the pressure of the gas, V is its volume, n is the number of moles of gas, R is the ideal gas constant, and T is the temperature in Kelvin.

If we double the temperature and halve the volume of the gas while keeping the number of moles constant, then the new pressure can be calculated as follows:

P1V1/T1 = P2V2/T2

Since the initial pressure (P1) is 1 atm, and the final volume (V2) is half the initial volume, the initial volume (V1) is 2 times V2, and the initial temperature (T1) is half of the final temperature (2T1 = T2), we can substitute these values into the equation above and solve for the final pressure (P2):

P1V1/T1 = P2V2/T2

1 atm x (2V2) / (T1/2) = P2 x V2 / T1

2 atm / (T1/2) = P2 / T1

P2 = 4 atm

Therefore, the new pressure of the gas after doubling the temperature and halving the volume is 4 atm. The correct answer is (d).

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Answer: In a chemical reaction, the atoms and molecules that interact with each other are called reactants. ... No new atoms are created, and no atoms are destroyed. In a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.

Explanation:

Answer: In a chemical reaction, the atoms and molecules that interact with each other are called reactants. ... No new atoms are created, and no atoms are destroyed. In a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.

Explanation: Hope this helped! :)

Explanation:

Percentage composition of oxygen = (80/134) * 100% = 59.7%.

Answer:

1

Explanation:

Refer to the attachment for proof

The balanced equation has a proportionate number of atoms on both sides of the reaction. In the reaction between lead nitrite and zinc bromide, the coefficient of PbBr₂ is 1. Thus, option C is correct.

A balanced equation is the representation of the elements and the compounds of the reactants and the product side in the symbolic forms along with their balanced coefficients.

The coefficient of the element on the right and the left side of the reaction must be the same in order for the reaction to be balanced. The balanced reaction between zinc bromide and lead nitrite is shown as,

ZnBr₂ + Pb(NO₂)₂ → Zn(NO₂)₂ + PbBr₂

Here, the number of zinc, lead, and nitrogen dioxide is 1 on both the reactant and product side, whereas bromine is two on both sides.

Therefore, in option C. the coefficient in front of PbBr₂ is 1.

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The pH of the given HBr solution after dilution is 0.58.

How to calculate the pH of a diluted HBr solution?

To calculate the pH of the given solution, we need to use the concentration of HBr and the volume of the solution.

Given:

Initial volume = 175 ml = 0.175 L

Initial concentration of HBr = 1.50 M

Final volume = 1.00 L

To dilute the solution, we need to add water. The number of moles of HBr will remain the same before and after the dilution. We can use the equation:

M1V1 = M2V2

where:

Rearranging the equation to solve for M2, we get:

M2 = (M1 x V1) / V2

M2 = (1.50 M x 0.175 L) / 1.00 L

M2 = 0.2625 M

Therefore, the final concentration of HBr after dilution is 0.2625 M.

Now, we can calculate the pH of the solution using the equation:

pH = -log[H+]

The concentration of H+ ions can be found using the dissociation of HBr in water:

HBr + H₂O ↔ H₃O+ + Br-

The equation shows that one H+ ion is produced for every HBr molecule that dissociates. Therefore, the concentration of H+ ions is the same as the concentration of HBr.

[H+] = 0.2625 M

pH = -log(0.2625)

pH = 0.58

Therefore, the pH of the solution is 0.58.

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Answer:

starch or carbs - amylase

fat - lipase

protien - pepsim

Answer:

d = 11.3 g/cm³

Explanation:

Given data:

Dimensions of lead block = 4.5 cm,5.2 cm, 6.0 cm

Weight of block = 1587 g

Density of lead block = ?

Solution:

Density:

Density is equal to the mass of substance divided by its volume.

Units:

SI unit of density is Kg/m3.

Other units are given below,

g/cm3, g/mL , kg/L

Formula:

D=m/v

D= density

m=mass

V=volume

Volume = 4.5 cm×5.2 cm×6.0 cm

Volume = 140.4 cm³

d = 1587 g/ 140.4 cm³

d = 11.3 g/cm³

4 liters of the 70% solution are required by the chemist.

8 liters of saline solution divided by 25%

Saline solution at 25% = 0.25 x 8 = 2 liters

Let there be x liters of saline solution at 70%.

Salt = 8 plus x

40% of salt is equal to 25% of saline solution plus 70% of saline solution.

2 + (70/100)x = (40/100)(8 + x)

2 + 0.7x = 0.4(8 + x)

2 + 0.7x = 3.2 + 0.4x

0.7x - 0.4x = 3.2 - 20.3

x = 1.2

x = 1.2 / 0.3

x = 4

4 liters of the 70% solution are required by the chemist.

The following equation can be used to determine the volume or concentration of a concentrated or diluted solution: M1V1 = M2V2.

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Answer:

Option A. 52.00 amu

Explanation:

From the question given above, the following data were obtained:

Isotope A:

Mass of A = 49.946 amu

Abundance (A%) = 4.345%

Isotope B:

Mass of B = 51.941 amu

Abundance (B%) = 83.789%

Isotope C:

Mass of C = 52.941 amu

Abundance (C%) = 9.501%

Isotope D:

Mass of D = 53.939 amu

Abundance (D%) = 2.365%

Average atomic mass =.?

The average atomic mass of the unknown element can be obtained as follow:

Average atomic mass = [(Mass of A × A%)/100] + [(Mass of B × B%)/100] [(Mass of C × C%)/100] + [(Mass of D × D%)/100]

Average atomic mass = [(49.946 × 4.345)/100] + [(51.941 × 83.789)/100] + [(52.941 × 9.501)/100] + [(53.939 × 2.365)/100]

= 2.170 + 43.521 + 5.029 + 1.276

= 51.996 ≈ 52.00 amu

Therefore, the average atomic mass of the unknown element is 52.00 amu

Answer:

3. The limiting reactant is the reactant that gives you the smaller amount of product. Therefore HCI is the limiting reactant in this problem. In this reaction 9.4 grams of ZnCl2 will form and there will be leftover zinc that did not react.

From 6.55 moles of Na₂SO₄ there is a mass of NaOH is 524 grams.

The balanced equation is.

CaSO₄ + 2NaOH --> Na₂SO₄ + Ca(OH)₂

From the balanced equation above,

1 mole of Na₂SO₄ will give 2 moles of NaOH.

because of that,

6.55 mol Na₂SO₄ will result from = 6.55 × 2 = 13.1 mol NaOH.

Then the mass of NaOH is:

Moles of NaOH = 5 moles

Molar mass of NaOH = 40 g/mol

So:

Moles = mass/molar mass

Mass of NaOH = 13.1 × molar mass

Mass of NaOH = 13.1 × 40

The mass of NaOH = 524 grams

So, the mass of NaOH is 524 grams.

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The enthalpy change for the reaction that is represented above would be = 97 KJ/mol.

To calculate the enthalpy change(∆H⁰) of the above given reaction, the formula that should be used will be given below as follows:

∆H⁰ = ∆H of products- ∆H of reactants.

Where;

Reactants= 941+3(436)= 2,249KJ/mol

Product= 6(391) = 2,346KJ/mol

Therefore the enthalpy change(∆H⁰);

= 2,346-2,249

= 97 KJ/mol

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What is the formula for potassium sulfate?

\(\implies {\blue {\boxed {\boxed {\purple {\sf { K_{2} SO_{4} }}}}}}\)

\(\circ \: \: { \underline{ \boxed{ \sf{ \color{green}{Happy\:learning.}}}}}∘\)

The atomic number of oxygen is 8. The mass number of an oxygen atom with 7 neutrons is 15.

Atomic mass is the average mass of the atom. It is measured in atomic mass units, that is Dalton. The mass number is calculated by the number of neutrons and atomic number.

The atomic number is the number of protons present in the atoms. The atomic number of oxygen is 8

The mass number can be calculated by adding those units

atomic number + number of neutrons

Mass number = 8 + 7 = 15

Thus, the mass number of an oxygen atom with 7 neutrons is 15.

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The given statement is true. Scientists who use logic to determine whether or not a drug is safe. These researchers are using the classical model of decision making.

A logical and methodical approach to decision-making is the classical model of decision-making. This model proposes that decision-makers gather all relevant data, thoroughly evaluate the alternatives, then select the alternative that maximises their utility or produces the desired result. This model makes the supposition that decision-makers have full knowledge of all available options, are unbiased and logical in their assessment, and make choices free from prejudice or emotional influence. It employs a sequential procedure that involves recognising the issue, specifying the decision criteria, allocating weight to each, producing alternatives, assessing the alternatives, and selecting the best option.

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