An unknown element has two isotopes. The first isotope has a mass of 68.926 amu and an abundance of 60.108%. The second isotope has a mass of 70,925 amu and an abundance
of 39.892%. Calculate the average atomic mass AND identify the element.

Answer: The following should be included in your description

• Zinc is the anode, and copper is the cathode

• The lemon flesh and juice provide the salt bridge and electrolyte solution

• Electrons flow from zinc to copper through the external wires

• Electrolytes flow in the lemon. Positive ions (cations) moved toward copper electrodes (cathodes), and negative ions (anions) move toward zinc electrodes (anodes). These balance the charges building up

• Two cells in series provide more energy output than one. The clock may need more energy than can be supplied by one cell

• Batteries do not need external source of reactants, whereas a fuel cell must be supplied with reactants

Explanation: Edg 2021

Answer:

C D

Explanation:

NOAA airplanes continuously transmit measurements of pressure, humidity, temperature, and wind direction and speed as they fall toward the sea, providing a detailed look at the structure of the storm and its intensity.

Answer:

Well, it would be the height of the plant. The independant varibles would be the amount of water you give the beans or the temperature you keep them!

Explanation:

I hope this helps!

The diagram shows the stages jamila uses to make zinc sulfate and the stages in the correct order include the following below:

This is referred to as a process used to separate solids from liquids or gases using a filter medium.

In the formation of zinc sulfate, the zinc is usually added to concentrated H₂SO₄ and filtered with the use of filter paper through several techniques to ensure that the filtrate is dry and concentrated.

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To determine how many grams of sodium sulfate will be formed from 175.0 grams of sodium hydroxide with an excess of sulfuric acid, you'll need to use stoichiometry.

In order to solve this problem, we need to use stoichiometry, which is the study of the quantitative relationships between reactants and products in a chemical reaction. We begin by writing a balanced chemical equation, which tells us how many moles of each reactant are needed to produce a given amount of product. From there, we use the mole ratios to convert between moles of reactants and products, and then to grams if necessary.

Calculate the moles of sodium hydroxide using its molar mass (40.00 g/mol):
moles of NaOH = (175.0 g NaOH) / (40.00 g/mol) = 4.375 moles NaOH.
According to the balanced equation, 2 moles of NaOH react with 1 mole of H2SO4 to form 1 mole of Na2SO4. Therefore, you can determine the moles of Na2SO4 produced using the mole ratio: , moles of Na2SO4 = (4.375 moles NaOH) x (1 mole Na2SO4 / 2 moles NaOH) = 2.1875 moles Na2SO4. Finally, convert the moles of Na2SO4 to grams using its molar mass (142.04 g/mol):, grams of Na2SO4 = (2.1875 moles Na2SO4) x (142.04 g/mol) = 310.61 grams.

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1/4  temperature must give Mass of nitrogen at 0°c heated so that both it volume and pressure will be double.​

To double both the volume and pressure of a given mass of nitrogen at 0°C, we can utilize the combined gas law, which relates the initial and final states of a gas. The combined gas law is expressed as:

(P1 * V1) / T1 = (P2 * V2) / T2

Where P1 and P2 are the initial and final pressures, V1 and V2 are the initial and final volumes, and T1 and T2 are the initial and final temperatures.

Since we want to double both the volume and pressure, we can set P2 = 2P1 and V2 = 2V1. Plugging these values into the combined gas law equation, we get:

(2P1 * 2V1) / T1 = P1 * V1 / T2

Simplifying the equation, we find:

4P1V1 = P1V1 / T2

Cancelling out the common terms, we have:

4 = 1 / T2

Rearranging the equation, we find:

T2 = 1 / 4

Therefore, to double both the volume and pressure of the given mass of nitrogen at 0°C, it must be heated to a temperature of 1/4 or 0.25 times its initial temperature.

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The correct balanced equation for hydrogen and oxygen reacting to form water is 2H₂ + O₂ ⇒ 2H₂O₂. Therefore, option B is correct.

Chemical equations are symbols and chemical formulas that depict a chemical reaction symbolically. Because mass cannot be generated or destroyed, according to the rule of conservation of mass, a chemical equation must always be in balance.

Equal numbers of atoms from various elements are present in both the reactants and the products in balanced chemical equations.

The left and right sides of the reaction arrow of a balanced equation have an equal number of each type of atom. The reactants and products are placed on the left and right sides of the arrow, respectively, to create a balanced equation.

Thus, The correct balanced equation for hydrogen and oxygen reacting to form water is 2H₂ + O₂ ⇒ 2H₂O₂. Therefore, option B is correct.

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Bronsted Lowry Acid is acid that readily donate a proton and use single reaction arrow to indicate that the ionisation is complete.

Option D is correct.

A Bronsted-Lowry corrosive is any species that can give a proton (H+) to another particle. Any species capable of accepting a proton from another molecule is a Bronsted-Lowry base. To put it succinctly, a base Bronsted-Lowry is a proton acceptor (PA) and an acid Bronsted-Lowry is a proton donor (PD).

A corrosive base response, as indicated by the Brønsted-Lowry definition, is an exchange of a proton starting with one particle or particle then onto the next. A pair of substances that are connected by the loss or gain of a single hydrogen ion is known as a conjugate acid-base pair. When a base accepts a proton, a particle known as a conjugate acid is produced.

Incomplete question:

fill in the blank. ____ Acids that readily donate a proton and use single reaction arrow to indicate that the ionisation is complete.

A. Hydrochloric acid (HCl)

B. Sulfuric acid (H₂SO₄)

C.  Nitric acid (HNO₃)

D. Bronsted Lowry Acid

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The given statement "In the valence bond theory, covalent bonds are described in terms of the overlap of atomic or hybrid orbitals" is true. Because the theory proposes that the formation of a covalent bond between two atoms is the result of the overlap of their valence atomic orbitals.

When the two atomic orbitals will overlap, their electrons are shared between the two atoms, creating a covalent bond.

Hybrid orbitals are also used in valence bond theory to explain the bonding in molecules where the central atom has hybridized orbitals. The hybrid orbitals overlap with the atomic orbitals of other atoms to form covalent bonds.

Overall, the valence bond theory provides a useful framework for understanding the bonding in covalent compounds and is still used today in combination with other theories to explain chemical bonding.

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The isotope symbol that fits each description is as follows: 68 neutrons, 47 electrons is Ag b. mass number = 197, 79 electrons is Au c. atomic number = 86, 136 neutrons is Rn d. atomic number = 76, mass number = 192 is Os.

Isotopes are two or more atom types that share the same atomic number (number of protons in their nuclei), location in the periodic table, and chemical element but have distinct nucleon numbers (mass numbers) as a result of having a different number of neutrons in their nuclei. Although the chemical properties of each isotope of a given element are nearly identical, they differ in their atomic weights and physical characteristics.

The name "isotope" refers to the fact that different isotopes of the same element occupy the same location on the periodic table. The word "isotope" is derived from Greek origins that mean "the same place".

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Answer: Magnesium loses two electrons whilst sulfur gains tw

Answer:

3.01 L

Explanation:

V

1

: 2.75L

T

1

:  

18

∘

C

V

2

: ?

T

2

:  

45

∘

C

If you know your gas laws, you have to utilize a certain gas law called Charles' Law:

V

1

T

1

=

V

2

T

2

V

1

is the initial volume,  

T

1

is initial temperature,  

V

2

is final volume,  

T

2

is final temperature.

Remember to convert Celsius values to Kelvin whenever you are dealing with gas problems. This can be done by adding 273 to whatever value in Celsius you have.

Normally in these types of problems (gas law problems), you are given all the variables but one to solve. In this case, the full setup would look like this:

2.75

291

=

V

2

318

By cross multiplying, we have...

291

V

2

= 874.5

Dividing both sides by 291 to isolate  

V

2

, we get...  

V

2

= 3.005...

In my school, we learnt that we use the Kelvin value in temperature to count significant figures, so in this case, the answer should have 3 sigfigs.

Therefore,  

V

2

= 3.01 L

The volume of added base at the equivalence point is 12.5 mL for both titrations.

Since HCl is a strong acid, the pH will be neutral (pH = 7) at the equivalence point of the HCl titration.

Since HF is a weak acid, the pH at the HF titration's equivalence point will be higher than 7 (basic).

a) To determine the volume of added base at the equivalence point, we need to use the balanced chemical equations for the reactions between HCl and KOH, and between HF and KOH:

HCl + KOH → KCl + H2O

HF + KOH → KF + H2O

The balanced equations show that one mole of base is required to neutralize one mole of acid. Therefore, at the equivalence point:

moles of HCl = moles of KOH added

0.100 M × 25.0 mL = 0.200 M × Veq

Veq = 12.5 mL

Similarly, for the titration of HF:

moles of HF = moles of KOH added

0.100 M × 25.0 mL = 0.200 M × Veq

Veq = 12.5 mL

b) HCl is a strong acid, so the pH at the equivalence point of the HCl titration will be neutral (pH = 7).

HF is a weak acid, so the pH at the equivalence point of the HF titration will be basic (pH > 7).

c) The initial pH of the HF solution will be lower than that of the HCl solution because HF is a weak acid and therefore has a lower initial concentration of H+ ions. This means that it will take less base to reach the equivalence point, resulting in a lower initial pH.

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a) The volume of added base at the equivalence point for the HF titration is 6.25 mL, while the volume of added base at the equivalence point for the HCl titration is 12.5 mL.

b) The pH at the equivalence point for the HCl titration will be neutral, while the pH at the equivalence point for the HF titration will be basic.

c) The titration curve with the lower initial pH will be the HCl titration, since HCl is a stronger acid than HF.

Titration is described as a common laboratory method of quantitative chemical analysis to determine the concentration of an identified analyte.

We know that at equivalence point, the moles of acid will be equal to the moles of base added.

moles acid = moles base

Molarity × volume = Molarity × volume

(0.100 M HCl) × (25.0 mL) = (0.200 M KOH) × (V1)

V1 = (0.100 M HCl) × (25.0 mL) / (0.200 M KOH) = 12.5 mL for HCL titration

(0.100 M HF) × (25.0 mL) = (0.200 M KOH) × (V2)

V2 = (0.100 M HF) × (25.0 mL) / (0.200 M KOH) = 6.25 mL for HF titration.

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5.0 X 10⁻²⁴ Mοles οf Silicοn is 3.01 X 10²⁴ Atοms. The number given by Avοgadrο is 6.022 x 10²³ atοms per mοle.

Optiοn D is cοrrect.

We must use Avοgadrο's number, which is the number οf atοms in οne mοle οf a substance, tο determine the number οf silicοn mοles in 3.01 x 10²⁴ atοms. The number given by Avοgadrο is 6.022 x 10²³ atοms per mοle.

(3.01 x 10²⁴ atοms) / (6.022 x 10²³ atοms/mοle) = 5 mοles

A substance's mοle is equivalent tο 6.022  10²³ units, such as atοms, mοlecules, οr iοns. Avοgadrο's cοnstant οr Avοgadrο's number is the number 6.022  10²³. It is pοssible tο cοnvert between mass and number οf particles using the mοle cοncept.

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Answer : The correct option is (C) each picture represents an isotope of lithium because they each have 3 protons.

Explanation :

Isotope : It is defined as the element that have the same number of protons but have the different number of neutrons of each of the atom.

As in the given picture, the number of protons are same but number of neutrons are different.

As we know that atomic number is either equal to number of protons or electrons for neutral atom.

The number of protons in the given picture are 3.

So, the element will be lithium with atomic number 3 and all are the isotopes of lithium.

Hence, the correct option is (C) each picture represents an isotope of lithium because they each have 3 protons.

The standard heat of vaporization of H₂0 is +2.5 kJ/g.

The standard heat of formation  of a compound is described as the change of enthalpy during the formation of 1 mole of the substance from its constituent elements in their reference state, with all substances in their standard states.

To calculate it, we need to divide the total energy required to change the 20g of H₂0 to steam by the amount of substance being vaporized.

The amount  is 20 g

the total energy required = 50kj

Therefore the standard heat of vaporization of H₂0 is   20/50 = +2.5 kJ/g

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Answer:

In a physical change, the substances involved retain their original properties. A new substance is not formed. A physical change can be reversed. Chemical changes happen on a molecular level when two or more substances chemically bond together.

Mending a broken bone  is a chemical change as to heal the bone enzymes are released which are chemicals.

Chemical changes are defined as changes which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical change.

There are several characteristics of chemical changes like change in color, change in state , change in odor and change in composition . During chemical change there is also formation of precipitate an insoluble mass of substance or even evolution of gases.

There are three types of chemical changes:

1) inorganic changes

2)organic changes

3) biochemical changes

During chemical changes atoms are rearranged and changes are accompanied by an energy change as new substances are formed.

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PO43- can form an ionic bond with a cation.

The chemical species which can easily form an ionic bond with a cation will be.

The definition of an ionic bond is a chemical bond that is formed between two ions that have opposite charges.

An Ionic bond is formed when one atom gives up one or more electrons to another atom.

These bonds can easily form between a pair of atoms or between molecules. This kind of bonding is most widely seen in bonds present in salts.

Compared to other options given,  is the best option as the total number of 32 valence electrons, is the highest among the given choices. Its tendency to form ionic bonds with the other cation is much higher as compared to others.

P has 5 electrons which combine with 4 O atoms which have 6 lone pairs and a -3 charge on it, which means it is accepting 3 electrons so it will be (+3), so total valence electrons will be 5 + 6 (4) + 3 = 32.

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Answer:

B. The products are nuclei of elements that are different from the original elements.

There is a law called conservation of energy which states that energy can neither be created nor be destroyed. It can be only transferred from one form to another form. Therefore, the correct option is option B.

Energy transfer is a phenomenon in which energy transfer from one matter to another matter. Energy can be transferred in two forms that are by doing work or by transferring heat.

Heat can be transferred by three ways conduction, convention and radiation. In conduction, when two object are in direct contact, transfer of molecules takes place. Kinetic energy is converted into thermal energy while  he practices his guitar.

Therefore, the correct option is option B.

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The ratio of the effusion rates of two gases is given by Graham's law, which states that the rate of effusion of a gas is inversely proportional to the square root of its molar mass. We need to determine the identities of the two gases in a mixture where one gas effuses 1.43 times faster than the other. To solve this, we can use Graham's law of effusion.

Graham's law states that the rate of effusion of two gases is inversely proportional to the square root of their molar masses.
Rate1 / Rate2 = (M2 / M1)
Given that one gas effuses 1.43 times faster than the other, we can set up the equation:
1.43 = √(M₂ / M₁)
Now, we need to find two gases that satisfy this equation. To do this, we can use the periodic table to check the molar masses of various gases and find a pair that fits the ratio. For example:
1.43 ≈ √(28.97 g/mol (air) / 20.18 g/mol (Ne))

Thus, the two gases could be air (a mixture of nitrogen, oxygen, and other trace gases) and neon (Ne). In summary, there are many possible combinations of gases that could have effused from the container, but one example is helium and sulfur hexafluoride.

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1. B, the energy associated with the motion of an object

2. C, 12.4 g/mL

3. C, 5

1) B) Kinetic energy is energy associated with the motion of an object.

2) B) Density equals mass divided by volume: 1.38 g/mL

3) C) There are 5 significant figures in 20.300

4) A) 80 is the atomic number for mercury on the periodic table.

5) E) The formula for copper (II) sulfate pentahydrate is CuSO4•5H2O

So in summary:

• Kinetic energy is the energy of a moving object due to its motion.

• Density is calculated by dividing an object's mass by its volume.

• Significant figures refer to the known precision of a measurement based on the digits reported.

• Atomic symbols represent elements on the periodic table.

• Chemical formulas use symbols of the elements to show the proportions of atoms in a compound.

Answer:

-175.15

Explanation:

1.0 °C = 274.15 K

2.0 °C = 275.15 K

3.0 °C = 276.15 K

4.0 °C = 277.15 K

5.0 °C = 278.15 K

6.0 °C = 279.15 K

7.0 °C = 280.15 K

8.0 °C = 281.15 K

9.0 °C = 282.15 K

The purpose of the lower air dam in the front of a vehicle is to improve aerodynamics and increase fuel efficiency. The air dam, also known as a front spoiler or splitter, is typically a protruding lip or panel located at the bottom of the front bumper.

When the vehicle is in motion, the air dam helps to redirect the airflow underneath the vehicle. It creates a smoother flow of air, reducing turbulence and minimizing drag. By reducing aerodynamic drag, the vehicle experiences less resistance, allowing it to move more efficiently through the air.

The improved aerodynamics provided by the lower air dam can result in reduced fuel consumption, as the engine does not have to work as hard to overcome air resistance. This makes the vehicle more fuel-efficient and can contribute to better overall performance.

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The system of photosynthesis is usually written as: 6CO2 + 6H2O → C6H12O6 + 6O2.

This approach that the reactants, six carbon dioxide molecules and 6 water molecules, are transformed through mild electricity captured through chlorophyll right into a sugar molecule and 6 oxygen molecules, the products.

The system of photosynthesis is finished withinside the following 3 steps: Absorption of sunlight : Pigment chlorophyll absorbs the Sunlight. Splitting of Water. Conversion of mild electricity into chemical electricity, and splitting of water into hydrogen and oxygen through mild electricity.

Photosynthesis is how vegetation produce meals withinside the presence of water and sunlight. The unique stages of photosynthesis are: Absorption of mild, Transfer Of electrons, Production Of ATP, and Carbon Fixation. The method of the system of photosynthesis may be written as: 6CO2 + 6H2O → C6H12O6 + 6O2.

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There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Therefore, the given statement is Slightly true.

Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.

An ionic compound is a metal and nonmetal combined compound.  Ionic compound are very hard. They have high melting and boiling point because of strong ion bond.

The formula of an ionic compound starts with a metal and that of a molecular compound starts with a nonmetal. The statement is Slightly true.

Therefore, the given statement is Slightly true.

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The freezing point of the solution is -11.8 °C.

The boiling point of the solution is 103.31 °C.

To determine the freezing point of the solution, we can use the equation:

ΔTf = Kf * m

where:

ΔTf is the freezing point depression,

Kf is the cryoscopic constant (for water, Kf = 1.86 °C/m),

m is the molality of the solution (moles of solute per kilogram of solvent).

First, let's calculate the molality (m) of the solution:

Molar mass of ethylene glycol (C2H6O2):

C = 12.01 g/mol

H = 1.01 g/mol (x 6) = 6.06 g/mol

O = 16.00 g/mol (x 2) = 32.00 g/mol

Total molar mass = 12.01 g/mol + 6.06 g/mol + 32.00 g/mol = 50.07 g/mol

Number of moles of ethylene glycol (C2H6O2) = mass / molar mass

Number of moles = 30.8 g / 50.07 g/mol = 0.615 mol

Mass of water = volume x density = 96.6 mL x 1.00 g/mL = 96.6 g

Now, let's calculate the molality:

Molality (m) = moles of solute / mass of solvent (in kg)

Molality = 0.615 mol / 0.0966 kg = 6.36 mol/kg

Now we can calculate the freezing point depression (ΔTf):

ΔTf = Kf * m

ΔTf = 1.86 °C/m * 6.36 mol/kg = 11.8 °C

To find the freezing point of the solution, subtract the freezing point depression from the freezing point of pure water (0 °C):

Freezing point = 0 °C - 11.8 °C = -11.8 °C

To determine the boiling point of the solution, we can use the equation:

ΔTb = Kb * m

where:

ΔTb is the boiling point elevation,

Kb is the ebullioscopic constant (for water, Kb = 0.52 °C/m),

m is the molality of the solution (same value as calculated before: 6.36 mol/kg).

ΔTb = 0.52 °C/m * 6.36 mol/kg = 3.31 °C

To find the boiling point of the solution, add the boiling point elevation to the boiling point of pure water (100 °C):

Boiling point = 100 °C + 3.31 °C = 103.31 °C

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