what indicates the follwing percentage of the natural occurance of an isotope ofc an element

Answer: 17.5 %

Write the equation for relative Atomic mass in terms of an ( 'a' being one isotope's mass) and solve for x:

88.7 = [tex]\frac{(a * 88) + ((100 - a) * 92)}{100}[/tex]

8870 = 88*a + 9200 - 92 * a

4*a = 330

a = 82.5

Find the value of b using a,

100 - a = b

100 - 82.5 = b

b = 17.5

So, the % abundance for the isotope with mass number 88 is 82.5% and the % abundance for the isotope with mass number 92 is 17.5% .

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The set of reactions that best represents the diagram of a precipitation reaction is given below:

Li₂SO₄ (aq) + AgNO₃ (aq)  ---->

The net ionic equation is given below:

SO₄²⁺ (aq) + 2 Ag⁺ (aq)  ----> Ag₂SO₄ (s) (a precipitate)

Precipitation reactions are reactions in which two soluble solutions when they are mixed result in the formation of an insoluble precipitate.

Precipitation reactions rea usually double replacement reactions.

Double replacement reactions also known as double displacement reactions are reactions in which an exchange of radicals occurs between two metallic cations resulting in the formation of an insoluble compound that forms the precipitate observed.

Considering the given reactions and the products obtained:

NH₄Br (aq) + Pb(C₂H₃O₂)₂ (aq) ---> forms no precipitate

KNO₃  (aq) + CuCl₂(aq) ---->  forms no precipitate

Li₂SO₄ (aq) + 2 AgNO₃ (aq)  ---->  2 LiNO₃ (aq) + Ag₂SO₄ (s) (forms a precipitate)

NaClO₄ (aq) + CaCl₂ (aq)  ---->  forms no precipitate

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Copper metal plus zinc sulfate solution : is not  possible because the copper metal is less reactive than zinc and copper cannot displace the zinc.

The copper metal with zinc sulfate reaction is not possible because copper is less reactive than the zinc cant cannot displace the zinc. so, the reaction :

Cu + ZnSO₄ ---->    no reaction

but the zinc plus copper sulfate is possible , copper is less reactive than zinc and zinc can displace the copper . and the reaction is called as displacement reaction the reacion is given as :

CuSO₄   +   Zn   ----->    ZnSO₄    +   Cu

Thus, Copper metal plus zinc sulfate solution : is not  possible because the copper metal is less reactive than zinc and copper cannot displace the zinc.

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Answer:

b.Independent variable

Explanation:

The independent variable is the one that is changed by the scientist. To insure a fair test, a good experiment has only one independent variable. As the scientist changes the independent variable, he or she records the data that they collect.

.

The reaction given below shows a balanced incomplete combustion reaction:

B. 2 C₅H₁₂ + 11 O₂--> 10 CO + 12 H₂O

A combustion reaction is a reaction that involves substances reacting exothermically with oxygen to release large amounts of heat and light energy.

Hydrocarbons are compounds that contain only hydrogen and carbon.

Hydrogen combusts completely in oxygen to produce carbon(iv) oxide and water.

However, the incomplete combustion of hydrocarbons produces carbon (ii) oxide and water instead carbon(iv) oxide and water.

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The new volume of the balloon is 26.307L. This can be solved with the help of Charles' law.

What is Charles' law?

According to the Charles' law, the volume of the gas is directly proportional to the temperature at constant pressure.

Here we assume that the pressure is constant in both the cases.

V1/T1 = V2/T2

30.6L/285.15K = V2/245.15K

V2= 26.307L.

Therefore, the new volume at -28 degree Celsius and constant 1 atm pressure is 26.307L according to Charles' law.

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1.34 x 10^{-3} is the concentration of NH4 .

What is pH ?

pH, a quantitative measure of the acidity or basicity of aqueous or other liquid solutions. Widely used in chemistry, biology, and agriculture, this term translates the concentration value of hydrogen ions. This typically ranges from about 1 to 10-14 gram equivalents per liter. Converted to a number between 0 and 14. At neutral (neither acidic nor alkaline), the concentration of hydrogen ions is 10−7 gram equivalents per liter, which corresponds to a pH of 7. Solutions below pH 7 are considered acidic. Solutions with a pH greater than 7 are considered basic or alkaline.

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Answer:

26.03 inHg

Explanation:

1 atm = 29.92 inHg

0.87 atm = 29.92 inHg x 0.87

0.87 atm = 26.03 inHg

Answer: 6

Explanation:

If we are only looking at the number of oxygen atoms in the product then the answer is 6.

NO3 contains 3 oxygen atoms.

(NO3)2 means that we have 2 NO3 groups which means there are 6 oxygen atoms.

The concentration of the unknown [tex]H_3PO_4[/tex] solution would be 0.0368 M

The equation of the reaction is as follows:

[tex]H3PO_4(aq)+3NaOH(aq)--- > 3H_2O(l)+Na_3PO_4(aq)[/tex]

The mole ratio of the  [tex]H_3PO_4[/tex] solution to the NaOH solution is 1:3.

But 0.140 M, 25.24 mL of NaOH was used.

Recall that: mole = molarity x volume (in Liters)

Mole of 0.140 M, 25.24 mL of NaOH = 0.140 x 25.24/1000

                                                             = 0.0035336 mol

Following the mole ratio, the equivalent mole of [tex]H_3PO_4[/tex] would be:

0.0035336 /3 = 0.00117786666

Recall that: molarity = mol/volume (in Liters)

Molarity of 0.00117786666 mol, 32.00 mL [tex]H_3PO_4[/tex] = 0.00117786666/0.032

                                                                                  = 0.0368 M

In other words, the molarity of the [tex]H_3PO_4[/tex] solution to 3 significant figures is 0.0368 M.

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The Gibbs free energy of the system is - 12.7 kJ/mol.

The term Gibbs free energy has to do with the amount of thermodynamic work that could be done by a system. We know that we can find the Gibbs free energy by the use of the equilibrium constant and the temperature of the system and that is what we have to do in this question as we do it.

We know that;

ΔG = -RTlnK

ΔG = The Gibbs free energy

R = gas constant

T = temperature

K = equilibrium constant

Thus;

R = 8.314 J/K/Mol

T = 25°C + 273 = 298 K

K =  1.7 x 10^2

When we substitute the values, we have;

ΔG =-(8.314  * 298 * ln  1.7 x 10^2)

ΔG =- 12.7 kJ/mol

We can see from the calculation that we are going to have the Gibbs free energy of the system thus described as - 12.7 kJ/mol.

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Answer:

q

=

−

176000

J

×

1

k

J

1000

J

=

−

176

k

J

The specific heat capacity of the metal can be calculated using calorimetric equation. The specific heat capacity of the metal is 0.499 J/g °C.

Specific heat capacity of a substance is the heat energy required to rise its temperature by one degree Celsius per one gram. It is an intensive property and thus constant for a substance.

The calorimetric equation connecting the mass m, specific heat capacity c, temperature difference ΔT  with the heat energy q is written as :

q = m c ΔT .

Given the heat energy of the metal is lost to ethylene glycol. Hence the heat energy change for both of the substance are equal and can be written as follows:

135 g × (153 -38.2 °C ) × c = 255 g × 2.43 J/g °C × (38.2 -25.7 °C)

c = [ 255 g × 2.43 J/g °C × (38.2 -25.7 °C) ] / [ 135 g × (153 -38.2 °C ) ]

  = 0.499 J/g °C.

Hence, the specific heat capacity of the metal is 0.499 J/g °C..

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On average, the total mass of ions in 4.75 liters of Mackenzie River water is 0.466 g grams.

The formula mass of an ionic compound is determined in the same manner as the formula mass of a covalent compound is determined: by adding the average atomic masses of all the atoms in the compound's formula.

Hence, the total mass is computed as follows:

(0.820 mM Ca 2⁺) X ( 2.25 L) = 1.845 mmoles at 40.0 g/mol = 73.8 mg

(0.430 mM Mg 2⁺) X ( 2.25 L) = 0.9675 mmoles at 24.3 g/mol = 23.51 mg

(0.300 mM Na⁺) X ( 2.25 L) = 0.675 mmol at 23.0 g/mol = 15.52 mg

(0.0200 mM K⁺) X ( 2.25 L) = 0.045 mmol at 39.1 = 1.75 mg

(0.250 mM Cl-) X ( 2.25 L) = 0.5625 mmol at 35.45 g/mol = 19.94 mg

(0.380 mM SO₄²-) X ( 2.25 L) = 0.855 mmol at 96.06 g/mol = 82.13 mg

(1.82 mM HCO₃ -) X ( 2.25 L) = 4.095 mmol at 61.02 g/mol = 249.87 mg

Thus, total mass = 73.8 + 23.51 + 15.52  + 1.75 + 19.94 + 82.13 + 249.87

= 466.52mg

Converted into grams  we have:
466.52/1000

= 0.46652

Hence, on average, the total mass of these ions 4.75 L [tex]\approx[/tex] 0.47 grams.

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Solid potassium (K) conducts an electric current, whereas solid potassium iodide (KI) does not because solid potassium has a delocalized sea of electrons and KI has its cations and anions.

Positively charged potassium and negatively charged iodine combine to form the straightforward inorganic ionic chemical potassium iodide. It is solid at room temperature and resembles sodium chloride or table salt in terms of crystalline structure.

The major uses of potassium iodide are to treat hyperthyroidism and as a dietary supplement for those who are iodine deficient. Additionally, it is utilized as an expectorant to treat asthma and other long-term respiratory disorders, as well as to shield the thyroid gland from radiation.

When potassium iodide is dissolved in water, it splits into cations and anions, enabling free electron movement across the solution. It does not conduct electricity when it is in a dry crystal state, though, like other ionic compounds.

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Answer:

.......element 3 ............

Heat from the burner radiates through the liquid and causes even heating. Due to this reason, the water at the top of the beaker the same temperature as that of the bottom. The correct option is option A.

Temperature is used to measure degree or intensity of heat of a particular substance. Temperature is measured by an instrument called thermometer.

Temperature can be measured in degree Celsius °c, Kelvin k or in Fahrenheit. Temperature is a physical quantity. Heat always flow from higher temperature source to lower temperature source. Heat from the burner radiates through the liquid and causes even heating. Due to this reason, the water at the top of the beaker the same temperature as that of the bottom.

Therefore, the correct option is option A.

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Kinetic energy is increasing, and potential energy is decreasing statement best describes the changes in energy as she begins to descend.

A particle or an object that is in motion has a sort of energy called kinetic energy. An item gains kinetic energy when work, which involves the transfer of energy, is performed on it by generating a net force. Kinetic energy refers to the energy that a moving thing has as a result of its motion.

Motion is kinetic energy. A object's velocity increases with pace. both the kinetic energy of water flowing (hydraulic energy) and the wind (wind energy), which can be used to produce energy. (Kinetic energy) is a type of energy.

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The assumption that an atom is indestructible is refuted by the fact that it can be further split into protons, neutrons, and electrons.

However, an atom is the smallest particle involved in chemical reactions. According to Dalton, every aspect of an element's atoms is the same.

The atom is the smallest unit of matter that may be divided without generating particles with an electrical charge. It is also the smallest material with properties resembling chemical elements. As a result, the atom acts as the basic building block of chemistry. Examine various electron configurations in the electron shells that enclose the atomic nucleus of an atom.

Examine various electron configurations in the electron shells that enclose the atomic nucleus of an atom. An atom is primarily made of space. The rest is made up of a positively charged nucleus made up of protons and neutrons that is surrounded by a cloud of negatively charged electrons. The nucleus is small and dense in comparison to electrons, which are the lightest charged particles in nature.

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300 grams of sodium iodide, Nal, must be used to produce 90.2 g of iodine, I₂

Sodium iodide is the ionic compound formed from the chemical reaction of sodium metal and iodine

Here given data is

I₂ has the molar mass = 253.8g/mol

So how many moles of I₂ we want to produce = 90.2 g I₂ ×1mol I₂ /253.8g/mol = 0.35 mole of I₂

Then the conversion of NaI to I₂ are

2 NaI → 2Na + I₂

0.35 mole of I₂ × 2 mole of NaI/mole of I₂ = 2 mole of NaI are needed

covert this value into gram

2 mole of NaI ×150. g NaI / mole NaI = 300 gram NaI would be needed

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In business, it is crucial to keep costs low because when costs exceed the profits or income then the business runs out of cash and becomes bankrupt.

A cost is the worth of money that has been used up to create something or supply a service and is thus no longer accessible for use in production, research, retail, or accounting.

In business, the cost might be one of acquisition, in which case the money spent to obtain it is recognized as cost.

Businesses incur two sorts of expenses: fixed and variable costs. Variable costs change with production, but fixed costs do not. Overhead expenses are another term for fixed costs.

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Answer:

this is your answer 1234

16 grams of HCl are in 1 L of 6 M HCl

Number of moles of a substance is actually the ratio of the given mass in the chemical reaction to the mass of one mole of substance. One mole of any substance equals Avogadro's number. It is also used to express concentration units such as mole per liter or molecular weight

Formula for molarity of solute is given as:

Molarity =   moles of solute                

                  Volume of solution in liter

moles of solute = Volume of solution × Molarity

moles of solute = 1L × 6M ⇒ 6moles

Mass of HCl = Number of moles × Molecular weights

                     = 6 × 36.5 ⇒ 16 grams

Therefore the 16 grams of HCl are in 1 L of 6 M HCl

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The practice is the most sustainable is using cloth grocery bags over and over again.

The sustainable practices are the practices which supports the ecological and economic health . the is of plastic bag , paper or cloth bag over and over again . we have to reuse for the shopping purpose. go for the paperless document. cloth bag are reusable and better than a plastic bags. cloth bag will reduces the plastic use and the pollution will also reduce caused by the plastic bags.

Thus, The practice is the most sustainable is using cloth grocery bags over and over again.

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a) The number of moles of LiOH in 1.0L of 0.25M LiOH is 0.25.

b)  The mole-to-mole ratio of LiOH to OH⁻ is  1:1.

c) The number of moles of  OH⁻ ions in 1.0L of 0.25M LiOH is 0.25.

d) The pH is equal to 13.39.

A mole can be defined as a unit for the measurement of a huge number of entities of atoms, molecules, ions, or other particular particles.  The number of entities constitute in one mole is equal to 6.023 × 10 ²³ which is known as Avogadro’s constant.

The dissociation of LiOH in water is as:

LiOH (aq) →  Li⁺(aq)  + OH⁻(aq)

The mole-to-mole ratio of LiOH to OH- in the balanced chemical equation is 1 : 1 as one mole of LiOH produces one mole of OH⁻ ions.

Given, the number of concentrations of LiOH solution = 0.25 M

The volume of the solution  = 1.0 L

The number of moles of LiOH = Molarity ×Volume

n = 0.25 × 1

n = 0.25 mol of LiOH

The number of moles of ions of OH⁻ from LiOH = 0.25 mol

We know that pH + pOH = 14

pH = 14 -pOH

pH = 14 - (-log [OH⁻])

pH = 14 + log (0.25)

pH = 13.39

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According to the given information Group in which no response is expected is a negative control.

The correct option is C.

A scientist may develop the hypothesis that a given type of tomato will be red if it carries the gene for the colour red. The scientist then discovers that every tomato of this variety is red during investigation.

Hypotheses are frequently employed to promote scientific research and enhance knowledge. These clear declarations serve as the cornerstone for all research experiments. Therefore, a problem in the creation of a hypothesis may lead to errors in the design of a whole experiment.

As previously said, a hypothesis serves as a response to the research question and directs the gathering and analysis of data. Researchers can use hypotheses to both identify relationships between variables and forecast relationships based on theoretical principles and/or empirical data.

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Yes, because of the liquid's specific heat capacity or heat capacity, different liquids heat up at varying speeds.

Which amount of heat is needed to raise the liquid's temperature by one degree Celsius? When analyzing a mass of 1 kg, the term "heat capacity" or "specific heat capacity" refers to the amount of heat needed to raise the temperature of 1 kilogram of liquid or fluid by 1°C.

area of the body's surface. nature of the body's surface. the body's surface's composition (material effects conductivity through walls of the body).

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Explanation:

as the number of shell increased the size of the atom increase but the same shell with different number of valence electron, as electron number increase the attraction between nucleus and valance electron increased then the atom becomes shrinks and so the size of it decreased.

Answer:

Third choice

Explanation

Because reactivity of the elements decrease across the periodic table and it depends on the number of protons it has. Hence low number of protons more reactive.