3 examples of electrochemical cell

Answer:

The new volume of water in the pipette is 8.53 mL

Explanation:

The given information are;

The initial volume of water in the transfer pipette = 15.23 mL

The amount of water transferred from the pipette = 6.7 mL

The new volume of water in the transfer pipette is given as follows;

New volume of water in the pipette =  Initial volume of water in the pipette - Volume of water transferred out

Therefore, we have;

New volume of water in the pipette = 15.23 mL - 6.7 mL = 8.53 mL

The new volume of water in the pipette = 8.53 mL

Answer:

8.5

Explanation:

15.23 - 6.7 = 8.53

The correct amount of sig figs would make the answer 8.5

bullet fired from a gun

falling apple from tree

stone at a height

rusting of iron

loud speaker

Answer:

3, 2, 4, 1

Explanation:

That's the correct sequence

Answer:

From bottom to top, Troposphere, Stratosphere, Mesosphere, Thermosphere, & at the top, Exosphere.

Explanation:

a) To solve for the k value in the equation T(t) = 70 + 142ekt, we can use the given information that the coffee temperature at 10 minutes was 110°F.

Substituting t = 10 and T(t) = 110 into the equation, we have:110 = 70 + 142ek(10). Subtracting 70 from both sides, we get: 40 = 142ek(10). Dividing both sides by 142, we have: ek(10) = 40/142. Taking the natural logarithm (ln) of both sides, we get: ln(ek(10)) = ln(40/142). Simplifying, we have: k(10) = ln(40/142). Dividing both sides by 10, we get: k = ln(40/142) / 10. Using a calculator, we find that k ≈ -0.0131. b) To find T(t) at 19.5 minutes, we can substitute t = 19.5 into the equation T(t) = 70 + 142ekt: T(19.5) = 70 + 142e(-0.0131)(19.5) Using a calculator, we can evaluate the expression to find T(19.5) ≈ 99.6°F. a) The decay of Lidocaine can be modeled using the equation L(t) = aekt. Given that the half-life of Lidocaine is about 1.5 hours, we can use this information to solve for the k value. Using the half-life formula, we know that: t1/2 = (ln 2) / k. Substituting t1/2 = 1.5 hours, we have: 1.5 = (ln 2) / k. Solving for k, we get: k = (ln 2) / 1.5. Using a calculator, we find that k ≈ 0.4621. b) The exponential model for Lidocaine decay is given by : L(t) = aekt. c) To find how long it will take for the amount of Lidocaine to reduce to 20 mg, we can substitute L(t) = 20 and solve for t. 20 = 200e0.4621t. Dividing both sides by 200, we have: 0.1 = e0.4621t. Taking the natural logarithm (ln) of both sides, we get: ln(0.1) = 0.4621t. Simplifying, we have: t = ln(0.1) / 0.4621. Using a calculator, we find that t ≈ 2.7 hours. Rounded to the tenths, it will take approximately 2.7 hours for the amount of Lidocaine to reduce to 20 mg.

To learn more about temperature, https://brainly.com/question/16999043

#SPJ11

The induction of dipole moments and the subsequent attractive interaction between inert gas atoms allow for the possibility of cohesion and condensation, enabling these atoms to form condensed phases under appropriate conditions.

In a system of two identical inert gas atoms separated by a large distance, the primary interaction between the atoms is the van der Waals interaction, specifically the London dispersion forces.

These forces arise due to temporary fluctuations in the electron distribution around the atoms, leading to the creation of instantaneous dipoles.

These induced dipoles in one atom can induce dipoles in the other atom, resulting in an attractive interaction between them.

The presence of these induced dipole moments leads to a temporary imbalance of charge distribution, creating a weak electrostatic attraction between the atoms.

Although the charge distributions on the individual atoms are neutral, the induced dipoles generate a net attractive force between them.

This interaction is responsible for the cohesion of inert gas atoms and their ability to condense into liquids or solids.

The London dispersion forces are relatively weak compared to other types of chemical bonding, such as ionic or covalent bonds.

However, they play a significant role in intermolecular interactions and are particularly important for noble gases, which have closed-shell electron configurations and do not form strong chemical bonds with other atoms.

Overall, the induction of dipole moments and the subsequent attractive interaction between inert gas atoms allow for the possibility of cohesion and condensation, enabling these atoms to form condensed phases under appropriate conditions.

Learn more about dipole moments from this link:

https://brainly.com/question/3138120

#SPJ11

Replacement  reaction.

Given

A chemical reaction

AB + C → CB + A

Required

reaction type

Solution

There are several types of reactions that can occur

synthesis: 2 elements combine to form a single product

polymerization: monomers combine to produce a polymer

decomposition: One compound breaks down into 2 components

oxidation : a change in oxidation number

replacement can be divided into 2

single replacement if one element replaces the other elements of a compound

double replacement if there is an ion exchange between two ion compounds in the reactant to form two new ion compounds

AB + C → CB + A

If we look at this reaction, element C replaces element A to form a new compound CB. So it is single replacement. But this reaction can also be said to be an oxidation-reduction reaction because there is a change in oxidation number

element A undergoes a reduction reaction

element C undergoes an oxidation reaction

So types of redox reactions can be combination, decomposition, displacement, combustion, and disproportion.

Answer:

oxidation

Explanation:

i passed and got 100%

Answer:

The earlier bog bodies that were discovered in the 1600s might have not been preserved properly due to a lack of knowledge on how to preserve them or a lack of awareness of their significance. It is also possible that they might have decayed and decomposed over time and not survived till the present day. However, the bog bodies found after the late 1800s were preserved and studied extensively due to the increasing awareness and understanding of their historical and archaeological significance.

Explanation:

Hope this helped!! Have a great day/night!!

Answer:

When you are exercising, your muscles need extra oxygen—some three times as much as resting muscles. This need means that your heart starts pumping faster, which makes for a quicker pulse. Meanwhile, your lungs are also taking in more air, hence the harder breathing.

Explanation:

Answer: I believe you are talking about the world's first recorded nuclear explosion that took place on the plains of the Jornada del Muerto Dessert.

Explanation: It is to be noted that the Trinity site is still considered to be radioactive, and Trinitite which is a green glass-like substance is found abundantly in the area. Trinity was an atmospheric test conducted by the U.S. Army on July 16th of 1945. The site was chosen because of its isolated, flat grounded, non-windy lands. This experiment was so tightly gatekept that not even the military policemen whom rode with it knew of its contents.

Answer: d. Water is the most abundant atom in Earth’s atmosphere.

Explanation:

Water percentage in the atmosphere is 0.001 percent only as it not the major reservoir or source of water. The water is available in the atmosphere in the form of water vapors. These water vapors when aggregate and their concentration becomes high they fall down as rain on earth so the rain is collected in water reservoirs like oceans, rivers, lakes, ponds, aquifers, and other sources of water, which are the components of hydrosphere on earth. So, hydrosphere is most abundant in water. Moreover, water is not an atom instead it is the molecule formed by the combination of two molecules of hydrogen and one molecule of oxygen.

Answer:

The release of energy with the fusion of light elements is due to the interplay of two opposing forces: the nuclear force, which combines together protons and neutrons, and the Coulomb force, which causes protons to repel each other.

The volume of 1.5 × 10^(-2) M NaOH that must be added to 500 mL of 0.2 M HCl to give a solution that has a pH of 2.15 is 6.67 mL.

To solve this problem, we first need to write the balanced chemical equation for the reaction between sodium hydroxide (NaOH) and hydrochloric acid (HCl), which is

NaOH + HCl → NaCl + H2O.

We are given the initial concentration of HCl as 0.2 M. We then use the pH value, which is 2.15, and the relationship between pH and the concentration of hydrogen ions ([H+]) to calculate the concentration of [H+] in the final solution.

Using the equation pH = -log[H+] and [H+] = 10^(-pH),

pH = -log[H+]

[H+] = 10^(-pH)

[H+] = 10^(-2.15) = 7.08 × 10^(-3) M

we find that [H+] = 7.08 × 10^(-3) M.

Next, we need to determine the mole ratio of NaOH to HCl, which we can find from the balanced chemical equation as 1:1. We then calculate the amount of NaOH required to react with all of the HCl in the initial solution, which is 0.1 moles.

moles of HCl = concentration × volume = 0.2 M × 0.5 L = 0.1 moles

moles of NaOH = 0.1 moles

Finally, we need to calculate the volume of 1.5 × 10^(-2) M NaOH required to provide 0.1 moles of NaOH.

moles of NaOH = concentration × volume

volume = moles of NaOH / concentration

volume = 0.1 moles / 1.5 × 10^(-2) M = 6.67 L

For more question on pH click on

https://brainly.com/question/172153

#SPJ11

Answer:

Explanation:

2H2O = H2 + O2

this ain't balanced because the value of hydrogen are not the same.

Answer:

Answered B

Explanation:

The earth moves which makes the stars and everything in space seem like its moving

Answer:

i have no clue

Explanation:

Answer:

??????????

Explanation:

Answer:

Pangaea or Pangea ( /pænˈdʒiːə/) was a supercontinent that existed during the late Paleozoic and early Mesozoic eras. It assembled from earlier continental units approximately 335 million years ago, and it began to break apart about 175 million years ago.

Explanation:

The difference in binding energy per nucleon between 23/11 Na and 23/12 Mg can be calculated by finding the total binding energy for each isobar and dividing it by the respective number of nucleons.

To calculate the difference in binding energy per nucleon between the isobars 23/11 Na and 23/12 Mg, we need to find the total binding energy for each isobar and then divide it by the respective number of nucleons.

The atomic mass of 23/11 Na is 23, which means it has 23 nucleons (protons and neutrons). The atomic number is 11, indicating it has 11 protons.

The atomic mass of 23/12 Mg is also 23, so it has 23 nucleons. However, the atomic number is 12, indicating it has 12 protons.

We can use the equation:

Binding Energy per Nucleon = (Total Binding Energy) / (Number of Nucleons)

To find the total binding energy, we can consult a table or use an approximate average value. Let's assume the average binding energy per nucleon for both elements is 8.5 MeV (million electron volts).

For 23/11 Na:

Binding Energy per Nucleon = (Total Binding Energy of Na) / (Number of Nucleons)

                         = (8.5 MeV) / (23 nucleons)

For 23/12 Mg:

Binding Energy per Nucleon = (Total Binding Energy of Mg) / (Number of Nucleons)

                         = (8.5 MeV) / (23 nucleons)

The difference in binding energy per nucleon can then be calculated by subtracting the value for Na from the value for Mg.

learn more about binding energy here:

https://brainly.com/question/32197843

#SPJ11

The branch of science that studies atoms is called atomic physics.

The study of the atom's structure, interactions with other particles, and subatomic energy levels is known as atomic physics. It has been established that this area of physics is an excellent application of quantum mechanics. It is one of the fundamental tenets of contemporary physics. Atomic, molecular, and optical physicists investigate the interactions between atoms, small molecules, electrons, and light.

Atomic energy levels and the excitations and de-excitations that go along with them play a significant role in many physical characteristics of matter and natural processes. A few examples are the hue of a rose, a laser's output, and the transparency of air. The founder of nuclear physics, Ernest Rutherford, was a New Zealander by nationality.

For such more questions on studies of atoms:

brainly.com/question/21348573

#SPJ4

The ideal gas equation gives the relation of the pressure and the volume of the gas with that of the moles and the temperature. Moles of oxygen in the lung are 0.026 moles.

The ideal gas equation states that moles of the substances are directly proportional to the pressure and volume but inversely to the temperature of the hypothetical gas.

The ideal gas equation can be given as,

\(\rm PV = nRT\)

Where,

Volume or the lung capacity (V) = 3.0 L

Pressure of the lungs (P) = 0.208 atm  

Gas constant (R) = 0.082057

Temperature of the air (T) = 295 K

Substituting values in the equation:

\(\begin{aligned}\rm n &= \rm \dfrac{PV}{RT}\\\\&= \dfrac{0.208 \times 3.0}{0.082057\times 295}\\\\&= 0.026 \;\rm moles\end{aligned}\)

Therefore, the number of the moles of the oxygen in lungs are 0.026 moles.

Learn more about moles here:

https://brainly.com/question/13909347

Explanation:

Melting is defined as the physical process where a solid state of a substance converts into its liquid state. No change of chemical composition takes place, just the physical state of water is changing.

\(\text{Solid}\rightleftharpoons \text{Liquid}\)

There are given carboxylic acids. The melting point of these acids increases to its second group member which is ethanoic acid due to prevalent hydrogen bonding. To break this bonding, a high amount of heat needs to be applied.

But as we move forward, the melting point decreases sharply as an increase in the number of carbon atoms decreases the hydrogen bonding.

Melting point of Formic Acid = \(8.3^oC\)

Melting point of Acetic Acid = \(16.6^oC\)

Melting point of Propionic Acid = \(-21^oC\)

Answer:

first u have to like draw like a number line uk how dey do in math but instead of num u add wht eva da question askin u

Explanation:

Answer:

a compound different from a molecule?

Molecule is a substance with two or more atoms bonded together such as the oxygen humans breathe (O2). Elements are pure substances made up of all the same atoms such as gold (Au), hydrogen (H), and oxygen (O). ... Compounds are two or more elements bonded together such as table salt (NaCl).

Explanation:

hope this helps

Answer:

they are diffrent by the way that atoms bind togther

Explanation:

if the atom is a diffrent structure thier diffrnt componds

The correct option for the process used to refine aluminum from its bauxite ore is option D.

D. Smelting

The reason why smelting is the correct choice is as follows;

Bauxite is the aluminum ore from which alumina, also known as aluminum

oxide, Al₂O₃, is produced. Bauxite is extracted from the topsoil regions of

some subtropical and tropical regions, and the Bayer process is primarily

then used to produce alumina from the bauxite.

Aluminum is produced from the alumina by an aluminum smelting process

known as the Hall—Heroult electrolytic process which involves the use of a

carbon anode and direct current to produce aluminum by reducing the

aluminum oxide

Learn more about smelting process here:

https://brainly.com/question/3444206

Answer:

Heat can travel from one place to another in three ways: Conduction, Convection and Radiation. Both conduction and convection require matter to transfer heat.

If there is a temperature difference between two systems heat will always find a way to transfer from the higher to lower system.

Dose of gamma radiation: e. Independent variable

The production rate of amino acids: c. Dependent variable

Sealing the solution in glass tubes: d. Level of treatment

Ammonia and formaldehyde: b. Control treatment

Ammonia and formaldehyde are used as a control treatment in the experiment. A control treatment is a condition or treatment that is used as a reference or a standard against which the results of the experiment can be compared.

The independent variable was the dose of gamma radiation, and the dependent variable was the production rate of amino acids. The level of treatment was sealing the solution in glass tubes, and the control treatment was ammonia and formaldehyde.

To know more about formaldehyde, visit here:

https://brainly.com/question/14895085

#SPJ4

If the area of a single stearic acid molecule is underestimated, the effect on the overall calculation of Avogadro's number from the data is that the estimate of Avogadro's number would be too low because the number of molecules would be too low.

Avogadro's number is defined as the number of atoms, molecules, or particles present in one mole of a substance. The value of Avogadro's number is 6.022 x 10²³, and it is considered one of the fundamental constants of nature.

Stearic acid is a saturated fatty acid with the chemical formula CH₃(CH₂)₁₆COOH. It is commonly found in animal and vegetable fats and oils, and it is a common ingredient in many cosmetic and industrial applications.The area of a single stearic acid molecule is essential to determine its packing efficiency in the crystal lattice. If the area of a single molecule is underestimated, it would lead to an overestimation of the number of stearic acid molecules in a given sample, which would consequently result in a low value of Avogadro's number. Therefore, the estimate of Avogadro's number would be too low because the number of molecules would be too low.

To learn more abut avogadro's number https://brainly.com/question/1513182

#SPJ11

0.6 g NaCl

Math

Pre-Algebra

Order of Operations: BPEMDAS

Chemistry

Atomic Structure

Stoichiometry

Step 1: Define

[RxN - Balanced] Na₂CO₃ (aq) + CaCl₂ (aq) → CaCO₃ (s) + 2NaCl (aq)

[Given] 0.5 g Na₂CO₃ reacted with excess CaCl₂

Step 2: Identify Conversions

[RxN] Na₂CO₃ → 2NaCl

Molar Mass of Na - 22.99 g/mol

Molar Mass of C - 12.01 g/mol

Molar Mass of O - 16.00 g/mol

Molar Mass of Cl - 35.45 g/mol

Molar Mass of Na₂CO₃ - 2(22.99) + 12.01 + 3(16.00) = 105.99 g/mol

Molar Mass of NaCl - 22.99 + 35.45 = 58.44 g/mol

Step 3: Stoichiometry

Step 4: Check

Follow sig fig rules and round. We are given 1 sig fig.

0.551373 g NaCl ≈ 0.6 g NaCl