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Reaction of galvanic cell

Given

Redox reaction between Zn and Mg

Required

Half reaction

Potential of the cell

Solution

Zn²⁺ + 2e -> Zn E ° = -0.76 V

Mg²⁺ + 2e -> Mg E ° = - 2.37 V

The higher E ° of the cell will act as the positive pole/cathode

Electrode Zn as a cathode (reduction) and Mg as an anode (oxidation) (E ° of Zn cells is greater than Mg)

Half reaction

Cathode: Zn²⁺ + 2e ⇒ Zn E ° = -0.76 V

Anode: Mg ⇒ Mg²⁺ + 2e E ° = +2.37 V

------------------------------------------------- ----------- +

Cell reaction: Zn²⁺ + Mg ---> Zn + Mg²⁺ E ° cell = +1.61 V

The reaction occurs spontaneously in the absence of an electric current, thus including galvanic cells/voltaic cells

The description of the movement of any chemical element that cycles through the biosphere and plays a role in it's stability,as well as cycling through other earth reservoirs is a Biogeochemical cycle.

Answer:

1. The pressure in outer space is so low that many consider it as non-existant. It has a pressure of 1.322 × 10−11 Pa. Pressure may be detected from the molecule of air or water hitting you. Since there is very little air and hardly ever water hitting you in space, pressure is almost zero or negligible.

2. Standard sea-level pressure, by definition, equals 760 mm (29.92 inches) of mercury, 14.70 pounds per square inch, 1,013.25 × 103 dynes per square centimetre, 1,013.25 millibars, one standard atmosphere, or 101.325 kilopascals.

3. 0.46J/gC

explanation.The specific heat capacity of a material is given by:

C_s = \frac{Q}{m \Delta T}C s = mΔTQ

where

Q is the amount of heat absorbedm is the mass

\Delta TΔT is the variation of temperature

For the piece of iron in the problem:

m = 15.75 gm=15.75g

Q=1086.75 JQ=1086.75J

\Delta T=175 C-25 C=150^{\circ}ΔT=175C−25C=150∘

Substituting into the equation,

C_s = \frac{1086.75 J}{(15.75 g)(150^{\circ}C)}=0.46 J/gCC s = (15.75g)(150 ∘ C)1086.75J = 0.46J/gC

4. 207 J

Explanation:

The key to this problem lies with aluminium's specific heat, which as you know tells you how much heat is needed in order to increase the temperature of 1 g of a given substance by 1∘C.

#I hope it's help

Answer:

Yellow fruit and dwarf vines are recessive traits in tomatoes. Red fruit and tall vines are dominant. Complete a Punnett square and answer the questions for a completely dominant red and tall plant crossed with a heterozygous red and dwarf plant.

Explanation:

Answer:

Atoms

Explanation:

Answer:

1eV

Explanation:

Answer:

1ev

Explanation:

Answer: with dog figs- it is 590

With decimals it is 589.68

Explanation:

Answer:

sullage or grey water

Explanation:

sources include: sinks, showers, baths, washing machines, dishwashers and no not toliets.

Answer:

The acid base imbalance would be metabolic acidosis.

Explanation:

Metabolic acidosis is a systemic failure that can occur from various causes, from an uncompensated diabetic with an excess of ketone bodies in the blood, to poisoning with CO2.

This is regulated and compensated by the respiratory system that seeks to eliminate CO2 through the respiratory tract in order to increase the alkalinity of the blood.

This system is highly accompanied by renal aid that is responsible for excreting acid metabolites and retaining fluids for the dissolution of acidosis.

On the other hand, in patients who suffer from this systemic failure, it will be noticed as a very characteristic symptom of hypercapnia and hyperventilation, since the respiratory system is in charge of increasing the frequency to quickly decrease this acidosis and that the low blood pH do not denature the proteins critical to vital signs.

Explanation:

Which group tends to form 1+ ions;

This is the group 1 elements. They easily lose their one valence electron to achieve a table octet configuration. Also known as Alkali metals

Which group tends to form 2+ ions;

This is the group 2 elements, also known as alkali earth metals.

Which group tends to form 1- ions;

This is the group 7 elements. They gain one electron to achieve an octet configuration. They are the Halogens

Which group tends not to form ions or react;

This is the group 8 elements also known as the Noble gas elements. They already have a stable octet configuration so there's no need to react or form ions.

Answer:

u didnt give a worksheet

Explanation:

Answer:

33.6 i think

Explanation:

Answer:

2 Al(s) + 3 H₂SO₄(aq) ⇒ Al₂(SO₄)₃(aq) + 3 H₂(g)

Explanation:

Let's consider the unbalanced equation for the single replacement reaction between Al and H₂SO₄.

Al(s) + H₂SO₄(aq) ⇒ Al₂(SO₄)₃(aq) + H₂(g)

We will begin balancing S atoms by multiplying H₂SO₄ by 3.

Al(s) + 3 H₂SO₄(aq) ⇒ Al₂(SO₄)₃(aq) + H₂(g)

Then, we balance Al atoms by multiplying Al by 2.

2 Al(s) + 3 H₂SO₄(aq) ⇒ Al₂(SO₄)₃(aq) + H₂(g)

Finally, we get the balanced equation by multiplying H₂ by 3.

2 Al(s) + 3 H₂SO₄(aq) ⇒ Al₂(SO₄)₃(aq) + 3 H₂(g)

Answer:

Pencil is an element and a heterogeneous mixture

Explanation:

Explanation:

I think the correct answer is B

Hope this helped u

Answer:

5 g of H₂ are contained in the vessel

Explanation:

A typical excersise of conversion:

We determine molar mass of H₂.

This is a dyatomic molecule, as molar mass of H is 1g/mol, molar mass of H₂ will be 2g/mol.

Let's make the conversion of units:

2.5 mol . 2g/mol = 5 g

5 g of H₂ are contained in the vessel

Mass of hydrogen in the vessel = 5 grams

The number of moles is defined as the given mass over molar mass.

[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex]

Given:

Number of moles= 2.5 mol

To find:

Mass of hydrogen=?

Molar mass of hydrogen =2g/mol

On substituting the values in the given formula we will get:

[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}\\\\\text{Given mass}=\text{Number of moles}*\text{Molar mass}\\\\\text{Given mass}=2.5 mol* 2g/mol\\\\\text{Given mass}=5 g[/tex]

Thus, mass of hydrogen in the vessel is 5 grams.

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Answer:

Matter can be broken down into two categories: pure substances and mixtures Pure substances are more broken down into elements and compounds Mixtures are physically combined structures that can be separated into their original components

Explanation:

hope it helps

Answer:

I believe you are asking about the objective lens or eyepiece.

Explanation:

Objective lenses are used to magnify objects enough for you to see them in great detail

Eyepiece/Ocular is what you look through at the top of the microscope.

A tube connects the eyepiece lens to objective lenses, which enhance the magnification power of the eyepiece lens. Both the eyepiece and the objective lens contribute to the magnification of the object.

The eyepiece lens usually magnifies 10x, and a typical objective lens magnifies 40x.

Answer:

communicable and non-communicable?

Answer:

The driver in the car because a truck is a bigger vehicle and the impact of a truck to a car is more damaging than a car to a truck. Weight difference is the key I think.

Explanation:

Answer:

D. One dependent variable and one experimental variable

Explanation:

The experimental variable is defined as an independent variable which can be manipulated during an experiment in order to find out its impact or influence on the dependent variable.

The dependent variable refers to a variable that changes when an experimental or  independent variable is manipulated.

Every experiment must have at least one experimental variable and one dependent variable in order to yield any meaningful result.

Explanation:

V is not an SI base unit. (C)

Volume can be expressed as m³ in units.

In turn, m is the SI base units for length.

Answer:

[PCl₃] = 0.031M

[Cl₂] = 0.031M

[PCl₅] = 0.969M

Explanation:

Based on the reaction:

PCl₅(g) ⇄ PCl₃(g) + Cl₂(g)

Keq is defined as:

Keq = 1.0x10⁻³ = [PCl₃] [Cl₂] / [PCl₅]

Where [] are equilibrium concentrations of each species

Inital [PCl₅] = 2.0mol / 2.0L = 1M.

In equilibrium:

[PCl₃] = X

[Cl₂] = X

[PCl₅] = 1M-X

Where X is reaction coordinate

Solving for X in Keq:

1.0x10⁻³ = [X] [X] / [1-X]

1.0x10⁻³ - 1.0x10⁻³X = X²

1.0x10⁻³ - 1.0x10⁻³X - X² = 0

X:

X = -0.032M. False solution, there is no negative concentration

X = 0.031M

That means equlibrium concentrations are:

[PCl₃] = 0.031M

[Cl₂] = 0.031M

[PCl₅] = 1-0.031M = 0.969M

Answer:

P(O₂) = 287.41 mmHg

P(O₂) = 413.59 mmHg

Explanation:

Given data:

Total pressure = 701 mmHg

Mass of methane = 2.75 g

Mass of oxygen = 3.45 g

Partial pressure of each gas = ?

Solution:

Number of moles of methane:

Number of moles = mass/molar mass

Number of moles = 2.75 g/ 16 g/mol

Number of moles = 0.17 mol

Number of moles of oxygen:

Number of moles = mass/molar mass

Number of moles = 3.45 g/ 32 g/mol

Number of moles = 0.12 mol

Total number of moles = 0.12 mol + 0.17 mol = 0.29 mol

Partial pressure of oxygen:

P(O₂)  = [ moles of oxygen / total moles ] × total pressure

P(O₂) = [0.12  / 0.29 ] × 701 mmHg

P(O₂) = 0.41 × 701 mmHg

P(O₂) = 287.41 mmHg

Partial pressure of methane:

P(O₂)  = [ moles of oxygen / total moles ] × total pressure

P(O₂) = [0.17  / 0.29 ] × 701 mmHg

P(O₂) = 0.59 × 701 mmHg

P(O₂) = 413.59 mmHg

Answer:

hydrogen nucleus formed, isotope of hydrogen, trítium formed, helium nucleus formed

Explanation:

Nucleosynthesis is the process which took place within few minutes of formation of universe . In this process initial lighter elements were formed from hydrogen atoms . The correct chronology is as follows .

1 ) Hydrogen nucleus

2 ) Deuterium

3 ) Tritium

4) Helium nucleus .

The correct order of events during the process of nucleosynthesis is hydrogen nucleus formed, isotope of hydrogen, tritium formed, helium nucleus formed.

Nucleosynthesis is a process that occurred within a few minutes of the universe's birth. Hydrogen atoms were used to create the first lighter elements in this process.

The following is the correct sequence of events.

Thus, the correct option is A.

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Answer:

A.) an exothermic reaction that has an increase in disorder.

Explanation:

got it correct (unit review test)

Balanced equation

2Al(ClO₃)₃ + 3BaSO₄⇒ Al₂(SO₄)₃ + 3Ba(ClO₃)₂

Given

Word equation

Required

Chemical equation

Solution

Chemical equations can be expressed in

Aluminum chlorate = Al(ClO₃)₃

Barium sulfate = BaSO₄

Aluminum sulfate = Al₂(SO₄)₃

Barium chlorate = Ba(ClO₃)₂

Al(ClO₃)₃ + BaSO₄⇒ Al₂(SO₄)₃ + Ba(ClO₃)₂

2Al(ClO₃)₃ + 3BaSO₄⇒ Al₂(SO₄)₃ + 3Ba(ClO₃)₂

The balanced equation of the given equation would be:

[tex]2Al(ClO_{3} )_{3} + 3BaSO_{4}[/tex] ⇒ [tex]Al_{2}(SO4)_{3} + 3Ba(ClO_{3})_{2}[/tex]

Given that,

Aluminum Chlorate  +  Barium Sulfate → Aluminum Sulfate + Barium Chlorate

In chemical form, it would be written as:

[tex]Al(ClO_{3} )_{3} + BaSO_{4}[/tex] ⇒ [tex]Al_{2}(SO_{4})_{3} + Ba(ClO_{3})_{3}[/tex]

After balancing the two sides, the equation will read as:

[tex]2Al(ClO_{3} )_{3} + 3BaSO_{4}[/tex] ⇒ [tex]Al_{2}(SO4)_{3} + 3Ba(ClO_{3})_{2}[/tex]

Thus, [tex]2Al(ClO_{3} )_{3} + 3BaSO_{4}[/tex] ⇒ [tex]Al_{2}(SO4)_{3} + 3Ba(ClO_{3})_{2}[/tex] is the correct answer.

Learn more about "Barium Sulphate" here:

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Answer: A

Explanation:

Answer:

C

Explanation:

because the combustion reaction produce vapor water and CO2