The question is incomplete, the complete question is:
Using the following portion of the activity series for oxidation half-reactions, determine which combination of reactants will result in a reaction.
[tex]Li(s)\rightarrow Li^+(aq)+e^-[/tex]
[tex]Al(s)\rightarrow Al^{3+}(aq)+3e^-[/tex]
A) Li(s) with Al(s)
B) Li(s) with [tex]Al^{3+}[/tex] (aq)
C) [tex]Li^+[/tex] (aq) with Al(s)
D) [tex]Li^+[/tex] (aq) with [tex]Al^{3+}[/tex] (aq)
Answer: The correct option is B): Li(s) with [tex]Al^{3+}[/tex] (aq)
Explanation:
The oxidation reaction is defined as the reaction in which a chemical species loses electrons in a chemical reaction.
A reduction reaction is defined as the reaction in which a chemical species gains electrons in a chemical reaction.
The chemical species will undergo a reduction reaction if the value of standard reduction potential is more positive or less negative.
For the given half-reactions:
[tex]Li(s)\rightarrow Li^+(aq)+e^-;E^o_{Li^+/Li}=-3.04V[/tex]
[tex]Al(s)\rightarrow Al^{3+}(aq)+3e^-;E^o_{Al^{3+}/Al}=-1.662V[/tex]
As the value of standard reduction potential of aluminium is less negative. Thus, it undergoes reduction reaction and lithium will undergo oxidation reaction.
The half-reaction follows:
Oxidation half-reaction: [tex]Li(s)\rightarrow Li^+(aq)+e^-[/tex] ( × 3)
Reduction half-reaction: [tex]Al^{3+}(aq)+3e^-\rightarrow Al(s)[/tex]
Overall cell-reaction: [tex]3Li(s)+Al^{3+}(aq)\rightarrow 3Li^+(aq)+Al(s)[/tex]
Hence, the correct option is B): Li(s) with [tex]Al^{3+}[/tex] (aq)
A sample of polystyrene, which has a specific heat capacity of , is put into a calorimeter (see sketch at right) that contains of water. The polystyrene sample starts off at and the temperature of the water starts off at . When the temperature of the water stops changing it's . The pressure remains constant at . Calculate the mass of the polystyrene sample. Be sure your answer is rounded to significant digits.
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
does a negative exponent mean that the number is less than 1 yes or no
Answer:
When a number is written in scientific notation, the exponent tells you if the term is a large or a small number. A positive exponent indicates a large number and a negative exponent indicates a small number that is between 0 and 1.
If 20.0 mLmL of a 0.100 NN acid solution is needed to reach the end point in titration of 32.5 mLmL of a base solution, what is the normality of the base solution
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]
which type of soil is the best for planting? A.Loam B.Clay c.sand
Answer:
A. Loam soil is best for planting
Thank you....
Have a good day....
Explain as to why two hydrogen form H2 molecule but not molecules such as H3, H4 etc..
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)
Use the following balanced equation to answer the questions below.
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
Show the complete ionic equation and net ionic equation for all the equations below, then state whether or not a precipitate (insoluble compound) will form. To receive full credit, you must show ALL your work.
Cacl2(aq) + K2co3(aq) + -------->
Bacl2(aq) + MgSO4(aq) + -------->
AgNO3(aq) + Kl(aq) →
Nacl(aq) + (NH4)2Cro4(aq) →
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.
I just want to know the answer
Explanation:
mixture............
suree
Answer: I believe the answer is C a mixture
Explanation:
find the sum of angles x° and y° from the given figure
Answer:
where is the figure . u can simply add them
What occurs when Na2SO4(s) is added to this system, increasing the concentration of SO42-(aq)?
1.
The equilibrium shifts to the left, and the concentration of Ba2+(aq) decreases.
2.
The equilibrium shifts to the left, and the concentration of Ba2+ (aq) increases.
3
The equilibrium shifts to the right, and the concentration of Ba2+ (aq) decreases.
The equilibrium shifts to the right, and the concentration of Ba2+ (aq) increases.
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.
What is equilibrium law?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
An atom has nine protons and ten electrons. This makes it:
An alpha particle
Neutrally charged
An ion
A cathode ray
Nonstoichiometric
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.
How does the neutron number in each compare
Answer:
Neutrons are all identical to each other, just as protons are. Atoms of a particular element must have the same number of protons but can have different numbers of neutrons.
Explanation:
Since the vast majority of an atom's mass is found its protons and neutrons, subtracting the number of protons (i.e. the atomic number) from the atomic mass will give you the calculated number of neutrons in the atom. In our example, this is: 14 (atomic mass) – 6 (number of protons) = 8 (number of neutrons).
To produce a neutral solution, both the anion and the cation of a salt must be neutral.
a. True
b. False
physical reactions of carbonyl group
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.
1. What is a huge ball of super-heated gases?
O planet
star
solar system
galaxy
Answer:
star
Explanation:
In the lab, you generated bisulfite ion (HSO3' ) from a solution of sodium metabisulfite (Na2S205)
according to the following net ionic equation,
S20,2- -(aq) + H20 (1)= 2HSO3(aq)
Calculate the concentration in M) of HSO in a solution prepared by mixing 10.00 mL of 0.00210 M
Na2S205
with 2.00 mL of water.
Answer:
I think it's b
Explanation:
HELP PLZ AND THANKS WILL MARK YOU AS BRAINLIEST
Answer:
D
Explanation:
help i’ll give u points
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.
A length of copper wire has a mass of 9.49. How many moles of copper are in the wire [ ] moles
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:
Molar mass of copper = 63.55 g/molNow we proceed to calculate the number of moles:
9.49 g ÷ 63.55 g/mol = 0.149 molesThere are 0.149 moles of copper in the wire.
What is AH°f for CO in the following reactions? 2 CO (g) + O2(g) → 2 CO2 (g) AH rxn 564 kJ/mol Given the values of AHF for CO2 is -393 kJ/mol
Explanation:
hi If u don't mind can u plz send a picture as it don't make sense for what is the data given e.g CO
1. An ion has a net charge of - 3, and 12 electrons, what is its atomic number? What element has that atomic number?
2. An ion of Celsius has a net charge of -5, how many electrons does it have?
3. Some atom has an atomic number of 46, how many electrons does it have if it has a net charge of +2?
4. How many neutrons are in an atom of Helium, and what is its mass number?
5. There are 3 neutrons in an isotope of Helium, what is its mass number?
6. n isotope has 83 neutrons and a mass number of 167, what is its atomic number? What element is defined by that atomic number?
7. What element has 54 neutrons and a mass number of 112?
8. What element has 10 electrons, a net charge of -2?
Answer:
19 because it gained 3 electron so 12-3=9 beryllium
2
3 is 46-2=44
4 is 2
5 is 5
6 84 polonium
7
8 oxygen
Explanation:
plz let me know if they are right or wrong:)
Convection currents occur:
a. Only in liquids
b. When a dense substance is warmer than a less dense substance
c. In both liquids and gases
d. Weakly in solids
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
A monoprotic weak acid when dissolved in water is 0.66% dissociated and produces a solution with a pH of 3.04. Calculate the Ka of the acid. g
Answer:
Ka = 6.02x10⁻⁶
Explanation:
The equilibrium that takes place is:
HA ⇄ H⁺ + A⁻Ka = [H⁺][A⁻]/[HA]We calculate [H⁺] from the pH:
pH = -log[H⁺][H⁺] = [tex]10^{-pH}[/tex][H⁺] = 9.12x10⁻⁴ MKeep in mind that [H⁺]=[A⁻].
As for [HA], we know the acid is 0.66% dissociated, in other words:
[HA] * 0.66/100 = [H⁺]We calculate [HA]:
[HA] = 0.138 MFinally we calculate the Ka:
Ka = [tex]\frac{[9.12x10^{-4}]*[9.12x10^{-4}]}{[0.138]}[/tex] = 6.02x10⁻⁶What is diabetes? How does it disrupt normal cellular activities? What are the overall consequences for your body?
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:
How many atoms are there in 5.20 mil of hafnium. Please help due in 1hr
Metallic Bond
When nitrogen shares electrons with oxygen, what kind of bond is made?
Answer: covalent bonds
Explanation:
The energies of the bonds broken in a certain reaction are greater than the energies of the bonds formed. Which one of the following statements about this reaction must be true?
a. The reaction is endothermic.
b. The reaction is exothermic.
c. The reaction is spontaneous.
d. The reaction is non-spontaneous.
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).
Acetylenic fatty acids are found in many tropical plants. Compound B, C18H32O2, is one such compound; it absorbs 2 equivalents of H2 when treated with H2 over a Pd/C catalyst. Ozonolysis of compound B produces the following products: nonanedioic acid (HOOC(CH2)7COOH) nonanoic acid (HOOC(CH2)7CH3) Draw the structure of compound B.
Answer:no
Explanatio:
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When an ionic compound is created, energy is _________when creating the cation, energy is usually _______ when creating the anion, and energy is _______ when the ionic bond is formed resulting in a net [ Select ] of energy for the entire process of making an ionic compound.
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.
La rapidez a la que cantan los grillos de árbol es de 2.0 ×102 veces por minuto a 27°C
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