Answer:
D. ammonia, because the other three are the only three strong bases in the world (we do not need to memorize base dissociation constant for the test, we just need to know the three strong bases)
Explanation:
q u i z l e t
Given the reaction:
4 HCl(aq) + MnO2(s) MnCl2(aq) + 2 H2O() + Cl2(g)
The manganese is
A) reduced and its oxidation number changes from +4 to +2
B) reduced and its oxidation number changes from +2 to +4
C) oxidized and its oxidation number changes from +4 to +2
D) oxidized and its oxidation number changes from +2 to +4
Redox is the oxidation-reduction reaction that includes the gain and loss of electrons. The oxidation of the manganese changes from +4 to +2 and gets reduced.
What are oxidation and reduction?In a redox reaction, the electrons are gained and lost by the chemical species. In oxidation, the electrons are lost by the species to another, while in reduction the electrons are gained by the species.
When the electrons are lost by the species their oxidation number gets increased, whereas when the species gains electrons their oxidation state decreases.
The oxidation number of manganese oxide and manganese(II) chloride is calculated as:
[tex]\begin{aligned}\rm Mn^{x}O_{2}^{2-}: \rm x -4 &= 0\\\\&= +4\end{aligned}[/tex]
and,
[tex]\begin{aligned}\rm Mn^{x}Cl^{2-}: x -2 &= 0\\\\&= +2\end{aligned}[/tex]
Therefore, the manganese is option A. reduced, and the oxidation number changes from +4 to +2.
Learn more about oxidation numbers here:
https://brainly.com/question/25673335
#SPJ1
Which part of experimental design is most important to a scientist when replicating an experiment?.
Answer:
A split-plot design lets us replicate our treatments twice using only 24 runs in a single time period, hence it is the most efficient use of resource.
Explanation:
hope this helps
Which metal will produce h2 gas when added to a solution containing a strong acid?.
The metals will produces hydrogen gas when added to solution containing a strong acid are aluminum, magnesium and zinc, etc.
What is single displacement reaction?Those reactions in which displacement of only one element will done by another element for the formation of product takes place will known as single displacement reaction.
Metals have the propeties to react with acids and will produce hydrogen gas, so those metals which are more reactive than hydrogen atoms and are present above the hydrogen atom in the electrochemical series will displace hydrogen from acids and produces hydrogen gas. Some of them are aluminum, magnesium, zinc, etc.
Hence metals are aluminum, magnesium and zinc, etc are the metals.
To know more about electrochemical series, visit the below link:
https://brainly.com/question/14652325
#SPJ1
What is the molarity of HCl found in a titration where 30 mL of HCl is titrated with 15 mL of 0.1 M NaOH
The molarity of HCl is found in a titration where 30 mL of HCl is titrated with 15 mL of 0.1 M NaOH is 0.05 M.
What is molarity?Molarity is the measure of the concentration of any solute per unit volume of the solution.
The reaction is [tex]\rm NaOH(aq)+HCl(aq) \rightarrow H2O(l)+NaCl(aq)[/tex]
The ratio is 1:1
Step1- to calculate the equal moles of HCl
[tex]\dfrac{0.1\;mol\;NaOH}{ L} \times 15\;ml = 1.5\; mmol[/tex]
Step2: Calculate the molar concentration
[tex]\dfrac{1.5 \; m mols\;HCl}{ 30\;ml\;HCl} = 0.05 \;M \;HCl[/tex]
Thus, the molarity of HCl is 0.05 M.
Learn more about molarity
https://brainly.com/question/2817451
#SPJ1
Which statement best describes how light and lenses work together?
Do someone no the answer
Answer:
Answer A
Explanation:
When light enters a lense it bends and changes direction, and then does this again when it leaves. leaving the correct image in the center
Which electrode gets heavier in an electrolytic cell?
OA. The electrode where reduction occurs
OB. The electrode that is donating electrons
C. The electrode with the higher reductive potential
OD. The electrode that is being oxidized
Answer:
The answer is the cathode. This electrode would get heavier in an electrolyte cell. This electrode would have the conventional current leaving then a polarize electrical device. A conventional current would be the one describing the direction where the electronic charges move.
Explanation:
aka... The electrode where reduction occurs.
Answer:
a. the electrode where reduction occurs
Explanation:
_____ are considered dietary proteins.
A. apples
B. oils
C. eggs
D. potatoes
Answer:
Eggs
Explanation:
Apple = fruit
Oils = fat
Potatoes = Carbs
And eggs are the only proteins
Which of the molecules below is propyne? two carbons are double bonded to each other; the pair is single bonded to h above left, below left, and below right, and to c h 3 above right. two carbons are double bonded to each other; the pair is single bonded to c h 3 above left and right, and to h below left and right. an h is single bonded to c, which is triple bonded to another c, which in turn is single bonded to a c with h above and below and yet another c to the right; the final c is bonded to h above, below, and right. an h is single bonded to c, which is triple bonded to another c, which in turn is single bonded to a c which is bonded to h above, below, and right.
Propyne is is composed of only hydrogen and carbon. It is a hydrocarbon molecule.
What is propyneThe molecule propyne is hydrocarbon. This means that it is composed of only hydrogen and carbon. The molecule contains three carbon atoms and four hydrogen atoms as shown.
The structral formula that corretly reperesents the molecule called propyne is shown in the image attaced to this answer.
Learn more about propyne: https://brainly.com/question/10648429?
#SPJ4
Answer:
C.
Explanation:
Order the following pH values from most acidic to least acidic (most basic).
5.7
7.0
1.2
9.1
Answer: 1.2 to 5.7 to 7.0 to 9.1
Explanation: Highest acidic begins with 1
Give an example of a polymer formed by addition polymerization.
Answer:
During the addition polymerization, all monomers are consumed and no byproducts are formed. Common examples of addition polymerization are polyethylene, polyvinyl chloride (PVC), acrylics, polystyrene, polytetrafluoroethylene, and polyoxymethylene (acetal).
What is meant by addition polymer?
In polymer chemistry, an addition polymer is a polymer that forms by simple linking of monomers without the co-generation of other products. Addition polymerization differs from condensation polymerization, which does co-generate a product, usually water.
Explanation:
What is the predicted product for the reaction shown?.
Hello, Miko here to help!
Answer: Often times it is possible due to previous data. Trends appear and you can make deductions from such trends. Reactions may not happen at all. There may be deviations from the trends as well. The deviations may be for unknown reasons or there may be unproven theories that are included in textbooks. Inorganic chemistry reactions are not as clear-cut as organic chemistry reactions. You don't have to memorize all the reactions. Know the trends, conduct the experiment, and if your prediction fails, try to think hard about the conditions in which the experiment took place. Sometimes the explanation may lay in the container that you used for the reaction, or it may be stoichiometry.
As in all sciences, you need experiments.
Explanation: I hope this helps have a great day!
MnO4- is a tetrahedral complex that is intensely purple. How many d orbital electrons does this complex have
A complex is a compound that is composed of a central metal atom/ion and then ligands. MnO4- is a d^0 specie hence it has no d electron.
What is a complex?A complex is a compound that is composed of a central metal atom/ion and then ligands. These ligands may lead to the color of the complex. However, the color of complexes more commonly result from the d-orbital transition in the metal atom/ion.
Now we know that the neutral electron configuration of Mn is [Ar]. 3d5. 4s2. It then follows that MnO4- is a d^0 specie hence it has no d electron.
Learn more about complex: https://brainly.com/question/14356798
A nearly complete skeleton, ____ is a classic example of a Neanderthal with many defining Neanderthal characteristics. Group of answer choices Taung Child La Ferrassie 1 Piltdown Man KNM-ER 1805
Answer: La Ferrassie 1
Explanation: La Ferrassie 1, often referred to as LF1, is a male Neanderthal skeleton estimated to be 70–50,000 years old. It was discovered at the La Ferrassie site in France by Louis Capitan and Denis Peyrony in 1909. The skull is the most complete Neanderthal skull ever found.
Name the compound
i: (CH3)2CHCOOH
Answer:
methylpropanoic is your answer
Divers get "the bends" if they come up too fast because the gas in their blood expands, forming bubbles in their blood. If a diver has 5.0 mL of gas in his blood under a pressure of 250. atm then rises instantaneously to a depth where his blood has a pressure of 50.0 atm, what will the volume of gas in his blood be?
Solve without converting volume into dm³ as it will led into same answer
According to Boyles law
P1V1=P2V25(250)=50V21250=50V_2V_2=25mLAccording to Boyle's law, the volume of gas in his blood will be 25 ml at constant temperature.
What is Boyle's law?
Boyle's law is an experimental gas law which describes how the pressure of the gas decreases as the volume increases. It's statement can be stated as, the absolute pressure which is exerted by a given mass of an ideal gas is inversely proportional to its volume provided temperature and amount of gas remains unchanged.
Mathematically, it can be stated as,
P∝1/V or PV=K. The equation states that the product of of pressure and volume is constant for a given mass of gas and the equation holds true as long as temperature is maintained constant.
According to the equation the unknown pressure and volume of any one gas can be determined if two gases are to be considered.That is,
P₁V₁=P₂V₂
substitution gives V₂=250×5/50=25 ml.
Therefore, the volume of gas in his blood will be 25 ml at constant temperature.
Learn more about Boyle's law,here:
https://brainly.com/question/1437490
#SPJ2
If you had a 4.0M and a 0.4M solution of nitric acid, which would have a lower pH? Why?
Answer:
the second one would have lower
Explanation:
because of the amount
pH is the measure of the negative log of the hydrogen ion concentration. The 0.4 M nitric acid will have lower pH.
What is pH?pH is the concentration of the hydronium or the hydrogen ion in the water that gives the account to the basic and acidic nature of the substance.
pH is dependent on the concentration of the substance as the increased concentration increases the pH while the lower concentration lowers the pH.
Therefore, 0.4 M will have a lower concentration.
Learn more about pH here:
https://brainly.com/question/27036490
#SPJ2
Are all the atoms in the same plane for cyclohexanone.
Answer:
the atoms in cyclohexanone are not in the same
Explanation:
but they are in a benzene ring! Cyclohexane has only sigma bonded carbons with bonds that stick out of the plane
In calculating a percent yield, you need a theoretical yield. Where does the theoretical yield come from?
Answer: Calculated results
Explanation:
What dissolved solid has the highest concentration in the ocean? sodium chloride
sulfur
calcium
magnesium
Answer:
chloride and sodium.
Explanation:
These two make up over 90% of all dissolved ions in seawater.
mark me brainliest
Answer:
sodium chloride
Explanation:
One important drawback of the use of hcfcs as a replacement for cfcs is that hcfcs.
One important drawback of the use of hcfcs as a replacement for cfcs is that hcfcs are more potent greenhouse gases.
What is hcfcs?HCFCs is an acronym for hydrochlorofluorocarbons (HCFCs).
Thye are fully or partly halogenated hydrocarbons that contain carbon (C), hydrogen (H), chlorine (Cl), derived from alkane family.
What is cfcs?CFCs is an acronym for Chlorofluorocarbons (CFCs), derived from alkane family like hydrochlorofluorocarbons.
Disadvantage of hcfcs over cfcsOne important drawback of the use of hcfcs as a replacement for cfcs is that hcfcs are more potent greenhouse gases.
Learn more about hcfcs and cfcs here: https://brainly.com/question/15885478
What is specific heat capacity?
Answer:
The energy needed to change the temp of a substance
Explanation:
Which is not a property of bases Group of answer choices react with metals to produce hydrogen gas react with acids to form a salt and water bitter taste slippery feel
Answer:
react with metals to produce hydrogen gas
Explanation:
NaOH is a common base and is a strong base. Look what happens with it reacts with a metal:
OH- (aq) + Li(s) --> LiOH. It forms a salt not H2
(I removed spectator ions)
What's the name of this molecule?
Answer:
option d
Explanation:
11. (15 pts) Predict the products of the following DISPLACEMENT REACTIONS. Balance the
equation for any reactions that occur and include states of matter. If no precipitation reaction
occurs, write "No reaction." Write the complete reaction in the space below.
a. (6 pts) ZnSO, (aq) + BaCh (aq) ›
b. (9 pts) Write the balanced equation for the reaction between aqueous solutions of lithium
carbonate and cobalt(Il) acetate.
The displacement reactions produces insoluble precipitates of barium sulfate and cobalt carbonate retrospectively.
What are displacement reactions?Displacement reactions are reactions in which an atom of an element or radical removes and replaces another arim or radical in a substance.
The displacement reaction between zinc sulfate and barium chloride is given below:
[tex]ZnSO_4(aq) + BaCl_2(aq) \rightarrow ZnCl_2(aq) + BaSO_4(s) \\ [/tex]
The balanced equation for the displacement reaction between aqueous solutions of lithium carbonate and cobalt(Il) acetate is given below as follows:
[tex]Li_2CO_3(aq) + Co(C_2H_3O_2)_2(aq) \rightarrow 2C_2H_3LiO_2(aq) + CoCO_3(s) \\ [/tex]
Therefore, the displacement reactions produces insoluble precipitates of barium sulfate and cobalt carbonate retrospectively.
Learn more about displacement reactions at: https://brainly.com/question/20690229
#SPJ1
Hypothesis for candy bar density lab
Need answer ASAP!!!!!
What is a large area of air with the same temperature?.
Sorry this is late but it would be the air mass
Hope this halpes :))
What is the name of this molecule?
H
O A. Propene
• B. Butene
C. Butane
D. Propane
Answer:
it D. the answer is propane. hope this helps you
Water is able to act as an acid in some reactions.
T/F
Answer:
True.
Explanation:
Water can act as a base or an acid. This means it is amphiprotic.
Which animal feels no pain when they are exposed to acid?.
Researchers have found out why the African nak.ed mole-rat, one of the world's most unusual mammals, feels no pain when exposed to acid. The animals have an altered ion channel in their pain receptors that is inactivated by acid and makes the animals insensitive to this type of pain.
hope it helps...!!!
An increase in blood carbon dioxide content causes hemoglobin to ________. release all bound carbon dioxide molecules bind more oxygen molecules bind more H release more oxygen molecules denature
An increase in blood carbon dioxide content causes hemoglobin to release more oxygen molecules. Details about hemoglobin can be found below.
What is hemoglobin?Hemoglobin is the iron-containing substance in red blood cells that transports oxygen from the lungs to the rest of the body.
Hemoglobin consists of a protein (globulin) and heme (a porphyrin ring with an atom of iron at its centre). This justifies its oxygen affinity.
However, excess carbon dioxide in the blood causes blood pH to decrease, resulting in hemoglobin proteins releasing more oxygen molecules.
Learn more about hemoglobin at: https://brainly.com/question/15011428