A galvanic cell consists of a Al3 /Al half-cell and a standard hydrogen electrode. If the Al3 /Al half-cell standard cell functions as the anode, and the standard cell potential is 1.66 V, what is the standard reduction potential for the Al3 /Al half-cell

Answer:

60ug

Explanation:

If it has experienced two half lives, that means it has been halved twice. in that case, to undo it, just multiply it by two twice. 0.15ug * 2 = 0.30ug. 0.30ug * 2 = 0.60ug. Hope this helps.

Answer:

D

Explanation:

Answer:

Absorbed

Released

Released

Explanation:

The formation of a cation is an endothermic process because energy must be absorbed in order to remove an electron from an atom.

Similarly, energy is evolved when an electron is added to an atom to form a negative ion.

The formation of an ionic compound is an exothermic process. Since ionic compounds are more stable than the individual ions separated by a distance, the excess energy of the isolated ions is evolved when the ionic compound is formed.

Answer:

See explanation

Explanation:

Image 1 is the chair conformation of trans-1-ethyl-2-methyl cyclohexane while image 2 is the chair conformation of Cis-1-ethyl-2-methyl cyclohexane.

Now let us look at the two structures closely. In the chair conformation, the more stable structure is the structure that has the bulky groups placed in the equatorial position.

Clearly, in trans-1-ethyl-2-methylcyclohexane, the ethyl and methyl groups are found to be in equatorial positions. Hence, trans-1-ethyl-2-methylcyclohexane is more stable in the chair conformation than cis-1-ethyl-2-methyl cyclohexane which has its methyl and ethyl groups in axial position.

Answer:

Jaheem has a goal running a total of 125 miles this month. Each day that he ran, he ran 7 miles. Which expression could Jaheem use to determine how many miles he has left to run after running for d days?

x a.

125 – 7d

x b.

7d + 125

x c. fraction numerator 125 over denominator 7 d end fraction

x d.

7dExplanation:Jaheem has a goal running a total of 125 miles this month. Each day that he ran, he ran 7 miles. Which expression could Jaheem use to determine how many miles he has left to run after running for d days?

x a.

125 – 7d

x b.

7d + 125

x c. fraction numerator 125 over denominator 7 d end fraction

x d.

7d

Answer:

0.149 moles

Explanation:

The problem is asking us to convert 9.49 grams of copper into moles. We can do that by using copper's molar mass:

Now we proceed to calculate the number of moles:

There are 0.149 moles of copper in the wire.

Answer:

C: Ion

Explanation:

We are told that the atom has;

9 protons

10 electrons.

Now, in chemistry, when number of electrons(negative) is more than number of protons(positive), we say that the atom is negatively charged.

Now, looking at the options;

- alpha particles have 2 protons and 2 neutrons and so it is not correct

- for an atom to be neutrally charged, number of protons must be equal to number of electrons. Thus it is not correct.

- For an atom to be an ion, it means that there is an unequal amount of electrons and protons. If the atom has more electrons than protons, it is called anion(negative ion) but if it has less electrons than protons, it is called cation(positive ion).

Thus, option C is the correct answer.

Answer: answer for the 1st one In a reactivity series, the most reactive element is placed at the top and the least reactive element at the bottom. More reactive metals have a greater tendency to lose electrons and form positive ions . answer for the 2nd one Food packaging is of high societal value because it conserves and protects food, makes food transportable and conveys information to consumers. It is also relevant for marketing, which is of economic significance. answer for the 3rd one Aluminium is a highly reactive metal, yet it is used to make utensils for cooking. ... This is because aluminium reacts with oxygen present in air to form a thin layer of aluminium oxide. This oxide layer is very stable and prevents further reaction of aluminium with oxygen.

Explanation:

Please mark me brainliest I tried so hard and I know it’s correct pls

Answer:

See explanation

Explanation:

a) the reaction between KI and Pb(NO3)2 occurs as follows;

2KI(aq) + Pb(NO3)2(aq) ---> PbI2(s) + 2KNO3

Hence the yellow precipitate in the reaction is PbI2

b) the reaction between BaCl2 and H2SO4 occurs as follows;

BaCl2(aq) + H2SO4(aq) ---> BaSO4(s) + 2HCl(aq)

Hence the white precipitate in the reaction is BaSO4

c) the reaction between NaOH and FeCl3 is as follows;

3NaOH(aq) + FeCl3(aq) ----> Fe(OH)3 + 3NaCl(aq)

Hence the brown precipitate is Fe(OH)3

d) the reaction between CuSO4 and NaOH occurs as follows;

CuSO4(aq) + 2NaOH(aq) ---> Cu(OH)2(s) + Na2SO4(aq)

Hence the blue precipitate is Cu(OH)2

Answer:

change in colour. hope helpful answer good morning ❤️

Answer:

I think it's b

Explanation:

Answer:

Water's polarity and its ability to form hydrogen bonds give it special properties, including adhesion, cohesion, and the ability to moderate temperature.

Answer:

0.093 mole of C₆H₁₂.

Explanation:

We'll begin by calculating the molar mass of C₆H₁₂. This can be obtained as follow:

Molar mass of C₆H₁₂ = (12×6) + (12×1)

= 72 + 12

= 84 g/mol

Finally, we shall determine the number of mole in 7.8 g of C₆H₁₂. This can be obtained as follow:

Molar mass of C₆H₁₂ = 84 g/mol

Mass of C₆H₁₂ = 7.8 g

Mole of C₆H₁₂ =?

Mole = mass / molar mass

Mole of C₆H₁₂ = 7.8 / 84

Mole of C₆H₁₂ = 0.093 mole

Thus, 7.8 g contains 0.093 mole of C₆H₁₂.

Answer: Accroding to my calculations One time when I went to deny i got lost and I was very tired and hungry So i licked my ice cream then I found my parents and had fun I hope you enjoyed my answer

Explanation: Whdd

Answer:

The correct answer is "0.051 N".

Explanation:

Given

Volume,

[tex]V_1=20.0 \ mL[/tex]

[tex]V_2=32.5 \ mL[/tex]

Normality,

[tex]N_1=0.1 \ N[/tex]

[tex]N_2=?[/tex]

As we know,

⇒ [tex]N_1V_1=N_2V_2[/tex]

or,

⇒ [tex]N_2=\frac{N_1V_1}{V_2}[/tex]

On putting the values, we get

⇒      [tex]=\frac{0.1\times 20.0}{32.5}[/tex]

⇒      [tex]=\frac{2}{32.5}[/tex]

⇒      [tex]=0.051 \ N[/tex]

Answer:

26.96 kPa

Explanation:

Applying,

PV/T = P'V'/T'............... Equation 1

Where P = Initial pressure, V = Initial volume, T = Initial temperature, P' = Final pressure, V' = Final volume, T' = Final temperature.

make P the subject of the equation

P = P'V'T/VT'.............. Equation 2

From the question,

Given: V = 0.766 L, T = 298 K, P' = 32.6 kPa, V' = 0.644 L, T' = 303 K

Substitute these values into equation 2

P = (32.6×0.644×298)/(0.766×303)

P = 26.96 kPa

Answer:

a. The reaction is endothermic.

Explanation:

The heat involved in a chemical reaction is given by the enthalpy change (ΔH), which is equal to the balance between the chemical bonds that are broken (release energy) and the chemical bonds that are formed (need energy):

ΔH ≅ bonds broken - bonds formed

If broken bonds > bonds formed ⇒ ΔH > 0 ⇒ endothermic reaction

Therefore, the reaction is endothermic (it requires energy).

Hydrogen is a diatomic gas with two atoms (di meaning two). H2 is referred to as molecular hydrogen because hydrogen atoms are covalently joined together to form a molecule.

Because two hydrogen molecules are connected to one other by a covalent connection, hydrogen is denoted as H2.

Hydrogen has only one electron, so to complete its duet(octet in case of nitrogen) it has to bond with another hydrogen molecule to be stable and also exist.

You can remember it like this :

H = element

H2 = gas

Other diatomic gases :

O2 (oxygen)

N2 (nitrogen)

Answer:

[tex]{ \boxed{ \bf{newtons \: law \: of \: gravitation}}} [/tex]

It states that the product of masses of bodies ( planets and satellites and asteroids ) in space is inversely proportional to square of their separation mean distance

[tex]{ \tt{formular : F = \frac{GMm}{ {r}^{2} } }}[/tex]

Answer:

The polarity of the carbonyl group notably affects the physical properties of melting point and boiling point, solubility, and dipole moment. Hydrocarbons, compounds consisting of only the elements hydrogen and carbon, are essentially nonpolar and thus have low melting and boiling points.

Explanation:

pls mark brainliest and these are my notes from last year.

Answer:

1

It also moves to the left.

Explanation:

When Na₂SO₄ is added to the equilibrium system then the equilibrium shifts to the left, and the concentration of Ba²⁺(aq) decreases.

Equilibrium law states that if any external stress is applied at the equilibrium state of any reaction then reaction will shift towards that side where the stress gets reduced.

Given chemical reaction is:

BaSO₄ ⇄ Ba²⁺ + SO₄²⁻

If in this equilibrium state, we add Na₂SO₄ as a result of which it increases the concentration of sulfate ion and equilibrium will shift towards the left side to maintain the concentration.

Hence the equilibrium shifts to the left, and the concentration of Ba²⁺(aq) decreases.

To know more about equilibrium law, visit the below link:

https://brainly.com/question/2943338

#SPJ2

Answer:

A. Loam soil is best for planting

Thank you....

Have a good day....

This question is incomplete, the complete question is;

A sample of polystyrene, which has a specific heat capacity of 1.880 J.g⁻¹, is put into a calorimeter (see sketch at right) that contains 300.0 g of water. The polystyrene sample starts off at 94.9 °C and the temperature of the water starts off at 22.0. When the temperature of the water stops changing it's 27 °C . The pressure remains constant at 1 atm.

Calculate the mass of the polystyrene sample. Be sure your answer is rounded to 2 significant digits.

Answer:

the mass of the polystyrene sample is 57 g

Explanation:

Given the data in the question;

mass of water m[tex]_{water[/tex]  = 300 g

Temperature of water T[tex]_{water[/tex] = 22 °C

Specific heat capacity of water C[tex]_{water[/tex] = 4.184 J/g°C

mass of the polystyrene sample m[tex]_{polystyrene[/tex]  = ?

T[tex]_{polystyrene[/tex] = 94.9 °C

Specific heat capacity of polystyrene; C[tex]_{polystyrene[/tex] = 1.880 J.g⁻¹.°C⁻¹

T = 27.7 °C

Now, using heat conservation equation

heat lost by polystyrene = heat gained by water

m[tex]_{polystyrene[/tex] × C[tex]_{polystyrene[/tex] × ( T[tex]_{polystyrene[/tex] - T ) = m[tex]_{water[/tex] × C[tex]_{water[/tex] × ( T - T[tex]_{water[/tex] )

We substitute

m[tex]_{polystyrene[/tex] × 1.880 × ( 94.9 - 27.7 ) = 300 × 4.184 × ( 27.7 - 22 )

m[tex]_{polystyrene[/tex]  × 1.880 × 67.2 = 300 × 4.184 × 5.7

m[tex]_{polystyrene[/tex]  × 126.336 = 7154.64

m[tex]_{polystyrene[/tex] = 7154.64 / 126.336

m[tex]_{polystyrene[/tex] = 56.63 ≈ 57 g   { 2 significant figures }

Therefore, the mass of the polystyrene sample is 57 g

Answer:

A. 4.5 mol Mg(OH)₂

B. 6 mol NaOH

Explanation:

Let's consider the following balanced equation.

Mg(NO₃)₂ + 2 NaOH ⇒ Mg(OH)₂ + 2 NaNO₃

PART A

The molar ratio of NaOH to Mg(OH)₂ is 2:1. The moles of Mg(OH)₂ produced from 9 moles of NaOH are:

9 mol NaOH × 1 mol Mg(OH)₂/2 mol NaOH = 4.5 mol Mg(OH)₂

PART B

The molar ratio of NaOH to NaNO₃ is 2:2. The moles of NaOH needed to produce 6 moles of NaNO₃ are:

6 mol NaNO₃ × 2 mol NaOH/2 mol NaNO₃ = 6 mol NaOH

Answer:

D. It predicts whether or not a reaction will be spontaneous.

Explanation:

What does Gibbs free energy (ΔG) predict? .

A. It predicts what the rate of the reaction will be. NO. ΔG is a thermodynamical parameter and it is not related to the kinetics of the reaction.

B. It predicts how high the activation energy is. NO. ΔG is a thermodynamical parameter and it is not related to the kinetics of the reaction.

C. It predicts if entropy will increase or decrease. NO. ΔG depends on the entropy but not the other way around.

D. It predicts whether or not a reaction will be spontaneous. YES. If ΔG < 0 the reaction is spontaneous and if ΔG > 0 the reaction is not spontaneous.

Answer:

Diabetes is a group of diseases that affect how your body uses blood sugar (glucose). Glucose is vital to your health because it's an important source of energy for the cells. Cells are everywhere including the blood, bones and muscles. When you have diabetes, you don’t have enough insulin in your blood (an organ in your body called the pancreas makes insulin). Insulin controls the movement of blood sugar into the cells of the body.

Explanation:

Answer:

Ka = 6.02x10⁻⁶

Explanation:

The equilibrium that takes place is:

We calculate [H⁺] from the pH:

Keep in mind that [H⁺]=[A⁻].

As for [HA], we know the acid is 0.66% dissociated, in other words:

We calculate [HA]:

Finally we calculate the Ka:

Answer:

(a): Precipitate of calcium carbonate will form.

(b): Precipitate of barium sulfate will form.

(c): Precipitate of silver iodide will form.

(d): Precipitate of sodium chromate will form.

Explanation:

Complete ionic equation is defined as the equation in which all the substances that are strong electrolytes present in an aqueous state and are represented in the form of ions.

Net ionic equation is defined as the equations in which spectator ions are not included.

Spectator ions are the ones that are present equally on the reactant and product sides. They do not participate in the reaction.

(a):

The balanced molecular equation is:

[tex]CaCl_2(aq)+K_2CO_3(aq)\rightarrow 2KCl(aq)+CaCO_3(s)[/tex]

The complete ionic equation follows:

[tex]Ca^{2+}(aq)+2Cl^-(aq)+2K^+(aq)+CO_3^{2-}(aq)\rightarrow 2K^+(aq)+2Cl^-(aq)+CaCO_3(s)[/tex]

As potassium and chloride ions are present on both sides of the reaction. Thus, they are considered spectator ions.

The net ionic equation follows:

[tex]Ca^{2+}(aq)+CO_3^{2-}(aq)\rightarrow CaCO_3(s)[/tex]

Precipitate of calcium carbonate will form.

(b)

The balanced molecular equation is:

[tex]BaCl_2(aq)+MgSO_4(aq)\rightarrow MgCl_2(aq)+BaSO_4(s)[/tex]

The complete ionic equation follows:

[tex]Ba^{2+}(aq)+2Cl^-(aq)+Mg^{2+}(aq)+SO_4^{2-}(aq)\rightarrow Mg^{2+}(aq)+2Cl^-(aq)+BaSO_4(s)[/tex]

As magnesium and chloride ions are present on both sides of the reaction. Thus, they are considered spectator ions.

The net ionic equation follows:

[tex]Ba^{2+}(aq)+SO_4^{2-}(aq)\rightarrow BaSO_4(s)[/tex]

Precipitate of barium sulfate will form.

(c):

The balanced molecular equation is:

[tex]AgNO_3(aq)+KI(aq)\rightarrow KNO_3(aq)+AgI(s)[/tex]

The complete ionic equation follows:

[tex]Ag^{+}(aq)+NO_3^-(aq)+K^+(aq)+I^{-}(aq)\rightarrow K^+(aq)+NO_3^-(aq)+AgI(s)[/tex]

As potassium and nitrate ions are present on both sides of the reaction. Thus, they are considered spectator ions.

The net ionic equation follows:

[tex]Ag^{+}(aq)+I^{-}(aq)\rightarrow AgI(s)[/tex]

Precipitate of silver iodide will form.

(d):

The balanced molecular equation is:

[tex]2NaCl(aq)+(NH_4)_2CrO_4(aq)\rightarrow 2NH_4Cl(aq)+Na_2CrO_4(s)[/tex]

The complete ionic equation follows:

[tex]2Na^{+}(aq)+2Cl^-(aq)+2NH_4^+(aq)+CrO_4^{2-}(aq)\rightarrow 2NH_4^+(aq)+2Cl^-(aq)+Na_2CrO_4(s)[/tex]

As ammonium and chloride ions are present on both sides of the reaction. Thus, they are considered spectator ions.

The net ionic equation follows:

[tex]2Na^{+}(aq)+CrO_4^{2-}(aq)\rightarrow Na_2CrO_4(s)[/tex]

Precipitate of sodium chromate will form.