Answer:
[OH⁻]= 6.76*10⁻¹² M
pH= 2.83
[H₃O⁺]= 1.48*10⁻³
Explanation:
The pOH (or potential OH) is a measure of the basicity or alkalinity of a solution that indicates the concentration of hydroxyl ions [OH-] present in a solution. The pOH is defined as the logarithm of the concentration of OH- ions, with the sign changed:
pOH= -log[OH⁻]
In this case, pOH= 11.17. So:
11.17= -log [OH⁻]
Solving:
-11.17=log [OH⁻]
10⁻¹¹ ¹⁷= [OH⁻]
6.76*10⁻¹² M= [OH⁻]
pH, short for hydrogen potential, is a parameter that indicates the concentration of hydrogen ions [H⁺] or [H₃O⁺] that exist in a solution and is calculated as the logarithm of the concentration of H⁺ ions, with the sign changed:
pH= -log[H⁺]= -log[H₃O⁺]
The relationship between pH and pOH can be established by the expression:
pH + pOH= 14
In this case, being pOH=11.17:
pH + 11.17= 14
and solving you get:
pH= 14 - 11.17
pH= 2.83
Finally, replacing this value in the definition of pH:
2.83= -log [H₃O⁺]
and solving you get:
-2.83= log [H₃O⁺]
10⁻² ⁸³= [H₃O⁺]
1.48*10⁻³= [H₃O⁺]
Ms. Cristell, a seventh-grade teacher at OHVA, made the following statement, "Sound energy, also known as acoustic energy, is a type of mechanical energy." Why are sound waves considered a type of mechanical energy? Sound waves can travel through space Sound waves can travel through a solid Sounds waves are made by machines Sound waves transfer energy by the motion of particles
Answer:
The answer is D
Explanation:
I recently took a test with the same question and it said the answer was correct
I hope this helps and have a nice day <3
Answer:
WOWOWWOWOOWOWOWOW
Explanation:
What type of alloy will C and Fe form?
A. Substitutional alloy
B. Structural alloy
C. Composite
D. Interstitial alloy
The barcoding process begins with
Answer:
Explanation:
It starts with the company getting a GS1 Company Prefix Before a firm starts to use a barcode it has to come up with the GS1 Identification Keys which are the numbers that represent the company’s barcode. When the GS1 identification key is assigned, the firm acquires the GS1 Company Prefix that will enable the firm to create the identification keys for its goods, locations, trade items and coupons which will be unique to it worldwide.
2) Alum has twelve hydrated water molecules. Are these included in the molecular weight?
Why?
Answer:
The dot between KAl(SO4)2 and 12 H2O in the formula indicates that twelve moles of water are associated with every mole of KAl(SO4)2. Therefore, the mass of the twelve water molecules, called the waters of hydration, must be included in the molecular weight of the compound.
Explanation:
The mass of the twelve water molecules are included in the molecular weight of the compound ,therefore the given statement is true.
What do you mean by molecular weight?Molecular weight is the sum of all atoms in a molecule. Molecular weight is represented in the atomic mass unit . It tells us the number of grams of a substance is present in one mole of that compound.
Molecular weight is based on the molecular formula of a compound.
According to the question, the dot between K Al(SO4)2 and 12 H2O in the formula indicates that twelve moles of water are associated with every mole of K Al(SO4)2.
And because of this the mass of the twelve water molecules, called the waters of hydration, must be included in the molecular weight of the compound.
The twelve hydrated water molecules of alum are included in the molecular weight, hence the given statement is true.
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What is oxidized in a galvanic cell? O A. The salt bridge O B. The electrolytes O C. The cathode D. The anode
Answer:
D. The anode
Explanation:
The anode is oxidized in a galvanic cell. Therefore, option D is correct.
What is a galvanic cell?A galvanic or voltaic cell is an electrochemical device that transforms the chemical energy of spontaneous redox reactions into electrical energy. electrical cell A voltaic cell is an electrochemical device that produces electricity through chemical processes.
An electrochemical cell called a galvanic cell or voltaic cell, respectively named after the scientists Luigi Galvani and Alessandro Volta produces an electric current by spontaneous oxidation-reduction reactions.
Since electrons are left on the electrode when oxidation occurs, the anode, the electrode where oxidation happens, is the negative electrode in a galvanic cell.
Thus, option D is correct.
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Iron react with oxygen to form Iron (III) Oxide. How many moles of iron (III) Oxide is in 138.5g?
Answer:
0.87mole
Explanation:
The reaction equation is given as;
4Fe + 3O₂ → 2Fe₂O₃
Number of moles of Fe₂O₃ in 138.5g
To solve this problem;
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Molar mass of Fe₂O₃ = 2(56) + 3(16) = 160g/mol
Now;
Number of moles = [tex]\frac{138.5}{160}[/tex] = 0.87mole
Which of the following best describes the “social sciences”? Sciences that focus on researchers conducting objective studies Sciences that are able to objectively measure human behavior Sciences that focus on human behavior and society Sciences that objectively measure natural phenomena
Answer:
human behovoir
Explanation:
What does the VSEPR theory describe?
A. Why a full octet of valence electrons makes an atom stable
B. Which atoms are more electronegative than others
C. Why molecules have different shapes
D. How atomic radii change during bonding
Answer: it is C, why molecules have different shapes.
Explanation:
A P E X
The VSEPR theory (Valence Shell Electron Pair Repulsion theory) describes why molecules have different shapes.
C. Why molecules have different shapes.
The VSEPR theory is a model used to predict the shapes of molecules based on the repulsion between electron pairs in the valence shell of the central atom. It states that electron pairs, whether bonding or non-bonding, repel each other and tend to position themselves as far apart as possible to minimize electron-electron repulsion. This repulsion determines the spatial arrangement and overall shape of the molecule.
By considering the number of electron pairs around the central atom and the repulsion between them, the VSEPR theory can predict molecular geometries, including linear, trigonal planar, tetrahedral, trigonal bipyramidal, and octahedral, among others. It explains why molecules such as water (H₂O) have a bent shape or why carbon dioxide (CO₂) is linear.
Therefore, the correct answer is C. The VSEPR theory describes why molecules have different shapes by considering the repulsion between electron pairs in the valence shell of the central atom.
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what is biochemistry
Answer:
Biochemistry or biological chemistry, is the study of chemical processes within and relating to living organisms
Explanation:
Which statement explains why a rock does not sink in a lake that is frozen over?
1. Particles are much harder in a solid than in a liquid.
2. Particles are much closer together in a solid than in a liquid.
3. Particles in a solid are moving too fast for anything to penetrate them.
4. Particles in a solid are fixed in place.
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The members of a family observed that their water
meter was showing unusually high water use. They
thought of two methods to solve this problem.
Method 1: Wash fruits and vegetables in a pan of
graywater instead of running water from the tap.
Method 2: Collect the water used for rinsing fruits
and vegetables and reuse it to water house plants.
Which of these statements is most likely correct
about the two methods of water conservation? (3
points)
Method 2 is difficult to implement.
Method 1 is not healthy for humans.
O Method 2 is not environment friendly.
SW
O Method 1 is ineffective.
Answer:
Method 1 isn't safe for humans.
Answer: Method 2 is not environment friendly, or D.
Explanation: Recycled water, or graywater, is very harmful to the fish and if used to contain them within the farm, it would make the fish overall very sick, and the fish would be refused from being sold into stores. Thus, this is the correct answer.
Which of the following is not a part of the carbon cycle
Answer:
condensation is NOT part of the carbon cycle
Explanation:
Help Please..... Points Available!
I will give brainliest!!
Answer:
I think Its B
Explanation:
Answer:
the answer is:
no, because the reactivity of elements decreases from right to left on the periodic table.
Explanation:
In Metals:
Period - reactivity decreases as you go from left to right.
Group - reactivity increases as you go down a group
In Non-metals
Period - reactivity increases as you go from the left to the right.
Group - reactivity decreases as you go down the group.
Reactivity:
The reactivity of the elements increases going from left to right on the periodic table. Each element going from left to right tends to be more reactive. The electronegativity increases going from left to right, and it decreases going down the table.
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Which pair of atoms would form a polar covalent bond?
H and F is the pair of atom which ahs polar covalent bond. Thus option b is correct.
What is polar covalent bond?Polar covalent bond is defined as type of chemical bond where a pair of electrons is unequally shared between the two atoms due to the difference in their electronegativity.
HCl, H2O and HF etc. are some of the examples of polar covalent bond.
Non polar covalent bond is defined as type of chemical bond with equal sharing of the bond electron rises when the electronegativity of the two atoms are equal.
H2, N2, O2 etc. are some of the examples of non polar covalent bond.
Thus, H and F is the pair of atom which ahs polar covalent bond. Thus option b is correct.
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Your question is incomplete, but probably your complete question was
Which pair of atoms would form a polar covalent bond?
a. H and H
b. H and F
c. N and N
d. Na and F
please help if you get this right i will give brainliest will give 30 points
Answer:
change in size or shape
Explanation:
Answer: hey
Explanation:
If you mass 0.430 g of Co(NO3)2 6H2O and dissolve it in water, what further information would you need to calculate:_________.
a. the number of moles of Co(NO3)2 in the solution?
b. the molarity of the solution
Answer:
a. No information is required.
b. The volume of the solution.
Explanation:
Hello!
In this case, since hydrates are salts which have additional water in their structures, when making mole-mass calculations involving them, we need to consider the how many water molecules we find in the hydrate. In such a way, for 0.430 g of cobalt nitrate hexahydrate (six water molecules), we proceed as follows:
a. Since we have 0.430 g of hydrate, we may compute the moles of anhydrous cobalt nitrate by using the molar mass of the hydrate (291.04 g/mol) and then, by noticing that one mole hydrate has one mole of anhydrous, we are able to compute the moles of anhydrous cobalt nitrate as shown below:
[tex]0.430gCo(NO_3)_26H_2O*\frac{1molCo(NO_3)_26H_2O}{291.04gCo(NO_3)_26H_2O} *\frac{1molCo(NO_3)_2}{1molCo(NO_3)_26H_2O}\\\\=1.48x10^{-3}mol Co(NO_3)_2[/tex]
It means no further information is required.
b. Since the molarity is defined by the division of the moles of solute over liters of solution (M=mol/V), we would need the volume of the solution to successfully compute it.
Bes regards!
which of these zones of the ocean is most hospitable to life?
epipelagic
hadalapic
bathypelagic
abyssopelagic
Answer:
The correct answer is the epipelagic zone
James watson and francis discovers that hydrogen bond form between nitrogen bases in the dna molecule.why was the discovery important to understanding how dna replicates
Explanation:
!!!!!!!!!!!!!!!!!!!!!!!!!!!
what is used to help water wash away greasy dirt
Answer:
soap
Explanation:soap
Answer:
A molecule with polar and nonpolar ends
Explanation:
What happened to liquid materials when mixed with other liquids
Answer:
they remain liquid
Explanation:
because liquid in liquid mostly doesn't have any affect on the state of the matter
as,
water added to juice
remains liquid
Which of the following elements is the most reactive?
a
Beryllium
b
Calcium
c
Magnesium
d
Barium
Explanation:
The answer would be Berium because it can mix as well with other elements in the periodic table.
Barium is regarded as the most reactive elements out of all the options
provided.
Barium is an element with symbol Ba and atomic number 56. It belongs to
Group 2 metals whose reactivity increases as we go down the group.
The alkaline earth metals which are in Group 2 of the Periodic Table include
: beryllium, magnesium, calcium, strontium, barium, and radium
The increase in reactivity down the group is as a result of the decreasing
ionization energy required to form new compounds. The Ionization energy
decreases due to more inner shells and increase in distance from the
nucleus.
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Write a mechanism for the Williamson ether synthesis of 1-methoxy-4-propoxybenzene from 4-methoxyphenol and propyl bromide. Be as complete as possible and show electron flow for all steps.
Answer:
(Mechanism in attachment).
Explanation:
The Williamson ether synthesis is the most used method to form ethers, in which an alkoxide ion reacts with a primary alkyl halide in an SN₂ reaction. Usually, the alkoxide ion is prepared by the reaction of an alcohol with a strong base like sodium hydride, NaH.
The alkyl halide must be primary so an attack by the backside is not impeded. When the alkyl halide is not primary, the result is usually an elimination.
Mechanism
Step 1: form the alkoxide of the alcohol considering the most impeded group (in this case, the 4-methoxyphenol).
Step 2: the alkoxide displaces the leaving group from a good SN₂ substrate (the propyl bromide).
Therefore, in Williamson ether synthesis, the alkyl halide must be a good SN₂ substrate (generally primary). We choose the alkyl group less impeded to be the halide and the most impeded group to be the alkoxide ion.
Cl2 and N2 react according to the following equation 3Cl2(g) + N2(g) rightarrow 2NCl3(g) If 4 L of a stoichiometric mixture of chlorine and nitrogen are converted to nitrogen trichloride under conditions of constant temperature and pressure what is the volume of NCl3(g) produced?
Answer:
Volume of NCl3 is 3L
Explanation:
Avogadro states: All gases at the same volume under temperature and pressure constant have the same number of moles.
The chemical equation is:
3Cl2(g) + N2(g) → 2NCl3(g)
Where 3 moles of chlorine reacts with 1 mole of nitrogen to produce 2 moles of NCl3.
But using Avogadros law we can say:
3L of chlorine and 1L of nitrogen produce 2L of Nitrogen trichloride.
3L of chlorine and 1L of nitrogen: 4L (The stoichiometric mixture)
That means, volume of NCl3 produced is 3L
Idenify each statement below as either oxidation or reduction.
1.
Occurs when atoms gain electrons during bonding.:
2.
Occurs when the oxidation number of an element decreases in chemical reaction.:
3.
Occurs when atoms lose electrons during bonding.
4.
F + e- ----> F-
5.
Occurs when the oxidation number of an element increases in chemical reaction.:
Occurs when the oxidation number of an element increases in chemical reaction.
6.
2I- ----> I2 + 2e-
Answer:
Explanation:
An oxidation reaction has the following properties;
addition of oxygen removal of hydrogenloss of electronsincrease in oxidation numberincrease in the number of electronegative atom surrounding an element in changing from reactants to products.The reduction reaction is the opposite of the points mentioned above;
1. Occurs when atoms gain electrons during bonding: Reduction
2. Occurs when the oxidation number of an element decreases in chemical reaction: Reduction
3. Occurs when atoms lose electrons during bonding: Oxidation
4. F + e- ----> F- : Reduction
5. Occurs when the oxidation number of an element increases in chemical reaction: Oxidation
6. 2I- ----> I2 + 2e- : Oxidation
could some some one help with 2 4 5 7 8
Answer:
For number 2, your answer is C.
Explanation:
The nucleus is positively charged because the proton is positive and a neutron is neutral. An electron has a negative charge.
A sample of gas has an initial volume of 3.00 L and an initial pressure of 2.14 atm. If the volume expands to 8.15 L, what is the final pressure?a. 0.855 atm b. 0.788 atm c. 3.49 atm d. 5.81 atm
Answer:
The final pressure is 0.788 atm (option b).
Explanation:
Boyle's law says that the volume occupied by a given gaseous mass at constant temperature is inversely proportional to pressure. That is: if the pressure increases, the volume decreases, while if the pressure decreases, the volume increases. This is expressed mathematically as the product of pressure times volume equal to a constant value:
P*V=k
Assuming a certain volume of gas V1 that is at a pressure P1 at the beginning of the experiment, by varying the volume of gas to a new value V2, then the pressure will change to P2, and it will be fulfilled:
P1*V1=P2*V2
In this case:
P1= 2.14 atmV1= 3 LP2= ?V2= 8.15 LReplacing:
2.14 atm*3 L= P2* 8.15 L
Solving:
[tex]\frac{2.14 atm*3 L}{8.15 L} =P2[/tex]
0.788 atm= P2
The final pressure is 0.788 atm (option b).
what type of motion is illustrated in the diagram below?
Based on Table S, which group on the Periodic Table has the element with the highest electronegativity ? (1) Group 1 (2) Group 2 (3) Group 17 (4) Group 18
Answer:group 17
Explanation: I don’t know I just guessed and got it right .
In comparison to other groups, Group 17 has the highest electronegativity. A further explanation is below.
The different components such as fluorine, chlorine, bromine, iodide, as well as actinides, are found throughout the periodic tables' Group number 17 elements. These would be referred to together as HALOGENS.Because these components frequently combine or interact with alkali metals as well as alkaline earth materials that can generate halide salts, this same name "halogen" implies "salt-former."
Thus the response above i.e., option (3) is right.
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The number of protons in an atom is known as its atomic.
Answer:
The number of protons in an atom is unique to each element. For example, carbon atoms have six protons, hydrogen atoms have one and oxygen atoms have eight. The number of protons in an atom is referred to as the atomic number of that element. The number of protons also determines the chemical behavior of the element. GOOD LESSONS ♡
Can someone do my chemistry work? I'll pay you, also comment your socials please so I can contact and show you the questions!
Answer:
Stan Loona
Explanation:
Answer:
i dont feel like sending out my socials but if you can send me a picture of the problems on here i would be happy to help for free
Explanation:
i dont know if im going to be right about the questions but i can try
