Express 0.00212 in scientific notation.

The arbitrary assignment of the reduction of Zn2+(aq) to Zn(s) as E = 0 V serves as a reference point for determining the relative reduction potentials of other redox reactions. This assignment is based on the convention that the standard reduction potential

In the case of the Zn2+(aq) to Zn(s) reduction, the reaction involves the gain of two electrons by Zn2+ ions, leading to the formation of solid zinc metal. The assigned reduction potential of 0 V indicates that, under standard conditions (1 M concentration, 25°C, and 1 atm pressure), the Zn2+ ions have a tendency to accept electrons and be reduced to Zn metal.

Any reduction potential above 0 V suggests a greater tendency for reduction, while a negative reduction potential indicates a lower tendency for reduction compared to the Zn2+(aq) to Zn(s) reaction.

This reference potential allows us to compare the reactivity of other redox systems and predict the feasibility of different reactions. The more positive the reduction potential, the greater the tendency for reduction to occur. Therefore, if we encounter a reduction potential of +0.34 V for another reaction, we can infer that it is more likely to occur spontaneously compared to the Zn2+(aq) to Zn(s) reduction. Conversely, if we encounter a reduction potential of -0.50 V, we can conclude that the reverse reaction (oxidation) is more favorable than the reduction of Zn2+(aq) to Zn(s).

Overall, the assignment of E = 0 V for the reduction of Zn2+(aq) to Zn(s) provides a benchmark for understanding the electrochemical behavior of other redox reactions and allows us to make predictions based on the relative reduction potentials.

For more such questions on reduction

https://brainly.com/question/21851295

#SPJ8

Answer:

0.9180 M

Explanation:

Step 1: Write the balanced equation

H₂SO₄(aq) + 2 KOH(aq) ⇒ K₂SO₄(aq) + 2 H₂O(l)

Step 2: Calculate the reacting moles of KOH

27.00 mL of 1.700 M KOH react. The reacting moles of KOH are:

\(0.02700L \times \frac{1.700mol}{L} = 0.04590mol\)

Step 3: Calculate the reacting moles of H₂SO₄

The molar ratio of H₂SO₄ to KOH is 1:2. The reacting moles of H₂SO₄ are 1/2 × 0.04590 mol = 0.02295 mol.

Step 4: Calculate the molarity of H₂SO₄

0.02295 moles of H₂SO₄ are in 25.00 mL of solution. The molarity of the acid solution is:

\(M = \frac{0.02295 mol}{0.02500} = 0.9180 M\)

Answer:

Chlorine

Chlorine has two naturally occurring isotopes. In a sample of chlorine, 75.77% of the atoms are Cl-35, with a mass of 34.97amu.

Explanation:

hope it helps thanks❤

Chlorine has two naturally occurring isotopes. In a sample of chlorine, 75.77% of the atoms are Cl-35, with a mass of 34.97amu.

List the known and unknown values ​​and edit the problem. Convert each percentage value into a decimal by dividing it by 100. Multiply this number by the atomic mass of that spot. Mix together each isotope to find the median atomic mass.

To calculate the maximum percentage of each isotope in a sample of something, chemists usually divide the atomic number of a particular isotope by the total number of atoms of all that isotope and multiply the result by 100.

Learn more about isotopes here: brainly.com/question/6258301

#SPJ2

Potential energy diagram for a combustion reaction:. CLICK ON IMAGE.

In a typical combustion reaction, the reactants (e.g. a fuel and an oxidizer) are initially at a relatively high potential energy. As the reaction proceeds, the potential energy of the system decreases, and the products (e.g. carbon dioxide and water vapor) are at a lower potential energy than the reactants. The difference in potential energy between the reactants and products corresponds to the heat released during the reaction.

The diagram shows the initial energy level of the reactants, the activation energy required to initiate the reaction, and the final energy level of the products. The activation energy is the minimum amount of energy required for the reaction to occur.

Once the reactants have absorbed enough energy to reach the activation energy threshold, the reaction proceeds spontaneously and releases energy as it progresses to the lower-energy products.

Note that the shape of the potential energy diagram can vary depending on the specific reaction and the reaction conditions. For example, some reactions may have more complex energy profiles with multiple intermediate steps or energy barriers.

For more question on Potential energy click on

https://brainly.com/question/18963960

#SPJ11

Answer:

3. d

4. c

5. i

6. h

7. a

8. g

9. j

10. b

11. e

12. f

Explanation:

The value of enthalpy(ΔHº) for the final reaction (2C(s) + H₂(g) → C₂H₂(g) ) is  -1932.8KJ.

A system's enthalpy is its heat capacity. A reaction's enthalpy change is roughly equivalent to how much energy is lost or gained throughout the reaction. If the enthalpy of the system decreases over the reaction, the reaction is preferred.

C(s) + O₂(g) → CO₂(g) ΔHº = -94.6 kJ --- (1)

H₂(g) + O₂(g) → H₂O(l) ΔHº = -286.0 kJ ---(2)

2C₂H₂(g) + 5O₂(g) → 4CO₂(g) + 2H₂O (l)  ΔHº = -2598.8 kJ ---(3)

The value of ΔHº for the final reaction,

2C(s) + H₂(g) → C₂H₂(g)

ΔH₄° = 2× ΔH₂º +  ΔH₃º - ΔH₁º
ΔH₄° = 2× -286.0 + ( -2598.8) - (- 94.6)

ΔH₄° = 2× -286.0 -2598.8 + 94.6

ΔH₄° = 666 - 2598.8

ΔH₄° = -1932.8KJ.

To know more about enthalpy visit:  

https://brainly.com/question/13979547

#SPJ1

Answer:

B. Nitrogen

Explanation:

Hope this helps :)

The answer is nitrogen gas.

For a 35.83 g sample of potassium chlorate,  the mass of potassium chloride is mathematically given as

M Kcl=21.62g

Generally, the equation for the Chemical Reaction  is mathematically given as

2KClO_3----->2KCl+2O_2

Therefore

\(Mole of KCl=\frac{35.57}{122.55}\)

Mole of KCl=0.29mol

Mass of Kcl=0.29*74.55

Mass of Kcl=21.62g

In conclusion, Mass of Kcl

M Kcl=21.62g

Read more about Chemical Reaction

https://brainly.com/question/11231920

1. Using your knowledge of the Brønsted-Lowry theory of acids and bases, complete the following acid-base reactions and indicate each conjugate acid-base pair.

i. OH + HPO₂ → H₂O + H₂PO₄²⁻

The conjugate acid-base pair is OH/H₂O, HPO₂²⁻/H₂PO₄²⁻

2) Identify the conjugate acid-base pairs in the following reactions. Write A, B, CA, and CB below the appropriate substance.

i. HCO₃⁻ + NH₃ → NH₄⁺ + CO₃²⁻

The conjugate acid-base pair is HCO₃⁻/CO₃²⁻, NH₃/NH₄⁺

ii. HCI + H₂O → H₃O⁺ + Cl⁻

The conjugate acid-base pair is H₂O/OH⁻, HCI/Cl⁻, H₃O⁺/H₂O, Cl⁻/HCI

iii. CH₃COOH + H₂O → H₃O⁺ + CH₃COO⁻

The conjugate acid-base pair is CH₃COOH/CH₃COO⁻, H₂O/OH⁻, H₃O⁺/H₂O

iv. HOCI + NH₃ → NH₄⁺ + ClO⁻

The conjugate acid-base pair is HOCI/ClO⁻, NH₃/NH₄⁺

3. Write the formula for conjugate bases formed by the following acids.

i. HPO₄²⁻ → PO₄³⁻

ii. H₂O → OH⁻

iii. CN⁻ → HCN

iv. HOOC-COO⁻ → HOOCCOOH

4) Write the formula for conjugate acids formed by each of the following bases.

i. H₃O⁺ → H₂O

ii. HCN → H₂CN⁺

iii. NH₃ → NH₄⁺

5. Classify each of the following pH values as acidic, basic, or neutral.

Learn more about Conjugate base pairs here:

https://brainly.com/question/13336099

#SPJ1

Answer: Warm Water and powdered lemonade.

Explanation: Water is faster at dissolving something and powder takes a smaller effort to dissolve.

Answer:

C

Explanation:

In this question, we have a situation where a gas is in constant pressure but changing its volume and temperature, and the best way to solve a situation like this, is through the Charles's gas law formula, which shows the relationship between volume and temperature when the pressure is constant. The formula is:

V1/T1 = V2/T2

We have:

V1 = 3.50 L

T1 = 39.0°C, but we need this value in Kelvin, 312 K

V2 = ?

T2 = 20°C, or 293 K

Now we add these values into the formula:

3.50/312 = V2/293

V2 = 3.29 Liters of the new volume

Answer:

0.41 atm

Explanation:

A reaction between liquid reactants takes place at 10.0 °C in a sealed, evacuated vessel with a measured volume of 5.0 L. Measurements show that the reaction produced 13. g of sulfur hexafluoride gas. Calculate the pressure of sulfur hexafluoride gas in the reaction vessel after the reaction. You may ignore the volume of the liquid reactants. Round your answer to 2 significant digits.

Step 1: Given data

Step 2: Convert "T" to Kelvin

We will use the following expression.

K = °C + 273.15

K = 10.0 °C + 273.15 = 283.2 K

Step 3: Calculate the moles (n) of SF₆

The molar mass of SF₆ is 146.06 g/mol.

13. g × 1 mol/146.06 g = 0.089 mol

Step 4: Calculate the pressure (P) of SF₆

We will use the ideal gas equation.

P × V = n × R × T

P = n × R × T/V

P = 0.089 mol × (0.0821 atm.L/mol.K) × 283.2 K/5.0 L = 0.41 atm

Explanation:

Word Equation

Barium Chloride + Sodium Chromate = Sodium Chloride + Barium Chromate

1 mole of aqueous Barium Chloride [BaCl2] reacts with 1 mole of aqueous Sodium Chromate [Na2CrO4] to form 2 moles of aqueous Sodium Chloride [NaCl] and 1 mole of solid Barium Chromate [BaCrO4]

Covalent and ionic bonds refer to atoms joined by their electrons. In covalent bonds, electrons are shared by the involved non-metal atoms. Option 2 is correct. Occurs due to the sharing of electrons between two non-metal atoms.

Both of them, covalent and ionic bonds, are chemical bonds that can form between atoms.

Ionic bonds occur between atoms with different electronegativity. When they bind, they transfer electrons from one atom to the other creating ions with opposite charges that attract each other.

Ionic compounds are formed by anions and cations.

• Cations are positive ions derivated from metals.

• Anions are negative ions derivated from non-metals.

The metal atoms share its electrons with the non-metal ones, creating stable configurations. Ionic bonds do not create molecules.

Covalent bonds are formed between atoms share electrons to be more stable. Atoms involved share electrons equally, creating a strong bond between them.

Covalent bonds are usually formed between non-metal atoms.

Option 2 is correct. Occurs due to the sharing of electrons between two non-metal atoms

You can learn more about covalent and ionic bonds at

https://brainly.com/question/19739192

#SPJ1

Complete question

A template of a Venn diagram representing common and differentiating characteristics of covalent and ionic bonds is shown.

Which of the following characteristics can be written only in space C?

On the diagram,

Options,

Hence,  If the concentration of Acetic acid in vinegar is more than 7%, the limiting reactant is baking soda. If the concentration of Acetic acid in vinegar is less than 7%, the limiting reactant is vinegar.

The limiting reactant (or limiting reagent) is the reactant that gets consumed first in a chemical reaction and therefore limits how much product can be formed.

To solve this problem, it is necessary to know the exact concentration of acetic acid in vinegar, because manufacturers produce many types of vinegar the with different concentrations. Most often, concentration of acetic acid in vinegar ranges from 4% to 8%. In this case, it is possible

to calculate the concentration of vinegar making the assumption that 250 ml of vinegar reacts completely with 24 grams of baking soda.

Acetic acid \(CH_3CO_2H\)  reacts with baking soda \(NaHCO_3\) according to the equation:

\(CH_3CO_2H + NaHCO_3\) → \(CH_3CO_2Na + CO_2 + H_2O\)

1. Molar mass of \(NaHCO_3\) is 23+1+12+16×3 = 84 g/mol

= \(\frac{1 mol \;NaHCO_3}{84 g \;NaHCO_3}\)

= \(\frac{24 g \;NaHCO_3 X 1 mol \;NaHCO_3}{84 g \;NaHCO_3}\)

=0.29 mol \(NaHCO_3\)

2. From the balanced equation we see that 1 mole of \(NaHCO_3\) reacts with 1 mole of \(CH_3CO_2H\) , then 0.29 moles of \(NaHCO_3\) react with 0.29 moles of \(CH_3CO_2H\).

3. Mass of 1 mole of \(CH_3CO_2H\) is 12+ 1×3+12+16×2=60 g/mol

= \(\frac{0.29 mol \;CH_3CO_2H X \;60 g \;CH_3CO_2H }{1 mol \;CH_3CO_2H}\)

\(=17.4 g CH_3CO_2H\)

4. In this step density of vinegar is needed.

Making the assumption that concentration of acetic acid is 7%, we can calculate the mass of acetic acid in 250 ml of vinegar:

Mass of vinegar=Volume × density

= 250 ml ×1.0084 g/ml

=252 g

Mass of acetic acid = mass of vinegar × concentration ÷ 100%

= 252 g × 7% ÷ 100%

= 17.6 g.

17.6 g \(CH_3CO_2H\) is very close to 17.4 g \(CH_3CO_2H\). It means, that 250 ml of vinegar with a concentration of acetic acid equal to 7% reacts completely with 24 g of baking soda.

Hence,  If the concentration of Acetic acid in vinegar is more than 7%, the limiting reactant is baking soda. If the concentration of Acetic acid in vinegar is less than 7%, the limiting reactant is vinegar.

Learn more about the limiting reactant here:

https://brainly.com/question/19654705

#SPJ1

Answer:

During the early Paleozoic Era, the Earth's surface was very different from what it is today. The continents were arranged differently, forming one large supercontinent called Pangea. This landmass was surrounded by a single large ocean called Panthalassa. The climate was much warmer and wetter than it is today, with no ice caps at the poles.

The first land plants, known as bryophytes, appeared during the early Silurian Period, around 430 million years ago. These plants were small and simple, lacking roots and vascular tissue. They grew in damp environments, such as along the edges of lakes and streams. They were important in the development of soils and in the colonization of land by other organisms, such as insects and other arthropods.

Answer:

7.35 x 1023 atoms.

Explanation:

The mass in grams of a sample of Fli containing 7.35 × 10^23 atoms should be 255 grams.

Since The molar mass of bismuth (Bi) is 208.98 g/mol.

And, 1 mole Bi = 208.98 g/mol = 6.023×10^23 no of atoms

So, the mass in grams should be

= ( 208.98 g/mol ×7.35 × 10^23) ÷ (6.023×10^23)

= 255 grams.

Learn more about the mass here; https://brainly.com/question/20512522

A general exponential expression is something like:

A^n

This means that we need to multiply the number A by itself n times.

Using that we will get (-2)^6 = 64

With that definition, we can rewrite:

(-2)^6 = (-2)*(-2)*(-2)*(-2)*(-2)*(-2)

So we just need to solve the above expression.

Also, remember the rule of signs:

(-)*(-) = (+)

We will get:

(-2)*(-2)*(-2)*(-2)*(-2)*(-2) =  [(-2)*(-2)]*[(-2)*(-2)]*[(-2)*(-2)]

                                        =  4*4*4 = 16*4 = 64

Then we got:

(-2)^6 = 64

If you want to learn more, you can read:

https://brainly.com/question/17172630

The maximum height at which nitrogen molecule will go before coming to rest is 14 kilometers.

Given:

The nitrogen gas molecule with a temperature of 330 Kelvins is released from Earth's surface to travel upward.

To find:

The maximum height of a nitrogen molecule when released from the Earth's surface before coming to rest.

Solution:

The average kinetic energy of the gas particles is given by:

\(K.E=\frac{3}{2}K_bT\\\\K.E=\frac{3}{2}\times 1.38\times 10^{-23} J/K\times 330 K\\\\K.E=6.381\times 10^{-21} J\)

The nitrogen molecule at its maximum height will have zero kinetic energy as all the kinetic energy will get converted into potential energy

\(m= \frac{ 28.0134 g/mol}{6.022\times 10^{23} mol^{-1}}=4.652\times 10^{-23} g\\\\1g=0.001kg\\\\m=4.652\times 10^{-23}\times 0.001 kg\\\\=4.652\times 10^{-26} kg\)

\(P.E=mgh\)

\(6.381\times 10^{-21} J=4.652\times 10^{-26} kg\times 9.8 m/s^2\times h\\\\h=\frac{6.381\times 10^{-21} J}{4.652\times 10^{-26} kg\times 9.8 m/s^2}\\\\h=13,996.6 m\\\\1 m = 0.001 km\\\\h=13,996.6 m=h=13,996.6\times 0.001 k m\\\\=13.9966 km \approx 14 km\)

The maximum height at which nitrogen molecule will go before coming to rest is 14 kilometers.

Learn more about the average kinetic energy of gas particles here:

brainly.com/question/16615446?referrer=searchResults

brainly.com/question/6329137?referrer=searchResults

Answer:

\(\boxed {\boxed {\sf 135 \ Joules}}\)

Explanation:

We are asked to find how much energy is needed to raise the temperature of a piece of iron. We will use the following formula for calculating heat energy:

\(q=mc \Delta T\)

The mass of the iron is 15.0 grams. The specific heat capacity of iron is 0.45 Joules per gram degree Celsius.

The change in temperature is the difference between the final temperature and the initial temperature.

The temperature is raised from 20.0 °C to 40.0 °C.

Now we know all 3 variables:

Substitute the values into the formula.

\(q= (15.0 \ g)(0.45 \ J/g \textdegree C)(20.0 \textdegree C)\)

Multiply the first 2 numbers together. The units of grams cancel.

\(q=(15.0 * 0.45 \ J/ \textdegree C)(20.0 \textdegree C)\)

\(q=(6.75 J/ \textdegree C)(20.0 \textdegree C)\)

Multiply again. This time, the units of degrees Celsius cancel.

\(q=(6.75 J/ \textdegree C *20.0 \textdegree C)\)

\(q=(6.75 \ J *20.0 )\)

\(q= 135 \ J\)

This number has 3 significant figures, which is the least number of sig fig in the original measurements, so it is the final answer.

135 Joules of energy are needed to increase the temperature of a 15.0 gram iron sample by 20.0 degrees Celsius.

Answer:

The total number of protons and neutrons is the mass number of an atom.

Explanation:

The mass number is made up of the total protons and neutrons in an atom. The mass number represents the mass of the atom in amu (atomic mass units). Electrons are not included in this representation because their mass is negligible (practically 0). The atomic number is made up of the total protons in an atom.

Answer:

The answer would be B.

Explanation:

Answer:

A liquid of unknown composition: Unknown liquid

A liquid of known composition: Known liquid

A solid-liquid mixture of unknown composition: Unknown solid-liquid mixture

A solid of known composition: Known solid

The compound is  FeCl5

The empirical formula is a chemical formula that shows the simplest whole-number ratio of the atoms in a molecule or compound. It is derived from experimental data such as the masses of the elements in a compound.

Number of moles of the iron = 2.538 g/56 g/mol

= 0.045

Number of moles of chlorine = 0.204 moles

Then we have that;

Dividing through by the lowest ratio we have that the mole ratio is; 1: 5

Thus the formula is FeCl5

Learn more about empirical formula:https://brainly.com/question/14044066

#SPJ1

Answer:

Reverse faults are caused by a type of stress known as compression where two sections of rock push into one another along a fault. The compression causes one side of rock to move either above or below the other side

The growth of the new plant depicts the asexual reproduction characteristic. The characteristic that describes the growth of the new plant in Stephan's mother cutting a twig from a rose bush and planting it in the soil is asexual reproduction.

Asexual reproduction is the mode of reproduction by which organisms generate offspring that are identical to the parent's without the fusion of gametes. Asexual reproduction is a type of reproduction in which the offspring is produced from a single parent.

The offspring created are clones of the parent plant, meaning they are identical to the parent.The new plant in Stephan’s mother cutting a twig from a rose bush and planting it in the soil depicts the process of asexual reproduction, which is the ability of a plant to reproduce without seeds. In asexual reproduction, plants can reproduce vegetatively by cloning themselves using their roots, bulbs, or stems.

Know more about    characteristic  here:

https://brainly.com/question/28790299

#SPJ8

ANSWER

Alpha particle...........> decreases the atomic number of an atom

Beta particles .............> increases the atomic number of the atom

Gamma particle ..........> does not change the atomic number of the atom

EXPLANATION

The three types of radioactive particles are;

1. Alpha particle

2. Beta particle

3. Gamma particle

Alpha particles has a positive charge with atomic number 2 and mass number 4

Any atom that gives off alpha particle, will have it atomic number drops by 2 and its mass number drops by 4

Hence, alpha particle decreases the atomic number of an atom

Beta particles; The atomic number of a beta particle changes, it can either be positive or negative

When an atom gives off a beta particle, the mass number number of the atom remains unchanged but the atomic number increases

Hence, beta particles increases the atomic number of the atom

Gamma particle is a neutral particle and it does not have any charge on it

When an atom gives off a gamma particle, the mass and atomic numbers of the atom remain unchanged

Hence, gamma particle does not change the atomic number of the atom

Answer:Liquid

Explanation:

Answer:

2.34x108 I guess!!

Explanation:

check ittt