Answer:
The answer is D. In the reactions A,B and C the reactants undergo changes in oxidation number. And also the reaction D is an acid_base neutralization reaction.
What is the function of the magnet in NMR?
A) It limits the nuclear spin to certain allowed spin states.
B) It allows random orientation of nuclear magnetic moments.
C) It causes the nucleus to spin.
D) It holds the sample in place.
Answer:
A) It limits the nuclear spin to certain allowed spin states.
Explanation:
A nucleus with an odd atomic number or an odd mass number has a nuclear spin, which can be observed through NMR.
A proton is the simplest nucleus, and its odd atomic number of 1 implies that it has one spin. We can visualize a spinning proton as a positively charged rotating sphere. This movement of a charged particle is like an electric current in a wired loop. It generates a magnetic field called the magnetic moment. When a small magnetic bar is placed in the field of a larger magnet, it rotates to align itself with the field of the larger magnet, a lower energy arrangement than an orientation against the field. Quantum mechanics requires that the proton's magnetic moment is aligned with the external field or against the field. The lowest energy state with the proton aligned with the field is called the spin alpha state (α spin). The higher energy state with the proton aligned against the external magnetic field is called the beta spin state (β spin).
In the absence of an external magnetic field, the magnetic moments of the protons have random orientations. When an external magnetic field is applied, each proton in a sample it assumes β state or α state. Because the state of spin α is lower in energy, there are more α spins than β spins.
Draw an important resonance form to show the delocalization of charge in the ion shown below.
Interactive 3D display mode
Answer:
Hello attached below is the missing ion diagram
Explanation:
Attached below is an important resonance form that shows the delocalization of charge in the ion shown
Why are alkalis sometimes
described as the opposite of
acids?
Answer: Because Alkalis are bases that can dissolve in water, which can also neutralize acid.
A substance made up of one type of atom is called an(a) ______________.
A. element
B. compound
C. atom
A substance that cannot be converted into another substance is known as an element. Each type of atom that makes up an element is unique. The correct option is A.
A substance whose atoms all contain the same number of protons is said to constitute an element; alternatively, all the atoms of a certain element must contain the same number of protons. Chemical reactions cannot degrade elements since they are the simplest chemical forms.
A compound is created when two or more components join chemically in a predetermined mass ratio.
Thus the correct option is A.
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(0.0046 x 15000.0) + (2817 x 13)
Answer:
36690
Explanation:
What will be the cost of gasoline for a 4,700-mile automobile trip if the car gets 41 miles per gallon, and the average price of gas is $3.79 per gallon?
Answer:
Idk
Explanation:
Find the gallons needed by dividing total miles by miles per gallon:
4700/41 = 114.634 gallons
Multiply the gallons needed by price per gallon:
114.634 x 2.79 = $319.83 Total
Round the answer as needed.
If gallons were rounded to 115 gallons total cost would be $320.85
$ 434.40
Explanation:41 miles ............ 1 gallon
4700 miles .......x gallon
x = 4700×1/41 = 114.63 gallons
114.63 gallons×$3.79 ≈ $ 434.40
Students observed cells under the microscope. They observed that the cells had a cell wall, cell membrane,
nucleus, and many chloroplasts.
Which observation helps students identify the type of cell observed?
A The presence of a nucleus means the cells are from a plant.
B The presence of a cell membrane means that the cells are from an animal.
C The presence of chloroplasts means that the cells are from a plant.
D The presence of a cell wall means that the cells are from an animal.
Answer:
option B is the right answer
Draw the conjugate base for the acid (CH3)2C=OH+ Remember to include charges and non-bonding electrons where
necessary
Answer:
Explanation:
An acid is a substance that, when dissolved in water produces hydrogen ions, H⁺ as the only positive ion. e.g.
HCl ↔ H⁺ + Cl⁻
HNO₃ ↔ H⁺ + NO⁻₃
This process is known as ionization. The characteristics properties of an acid in solution are due to the presence of these hydrogen ions. In these reactions, the negative ions formed or sometimes the neutral compounds are usually known as the conjugate base of such acid.
From the given information, the conjugate base of the acid given can be seen in the attached image below.
The conjugate base for the acid is attached below.
What is an Acid?An acid is a substance that, when dissolved in water produces hydrogen ions, H⁺ as the only positive ion. e.g.
HCl ↔ H⁺ + Cl⁻
HNO₃ ↔ H⁺ + NO⁻₃
This process is known as ionization. The characteristics properties of an acid in solution are due to the presence of these hydrogen ions. In these reactions, the negative ions formed or sometimes the neutral compounds are usually known as the conjugate base of such acid.
The conjugate base of the acid given can be seen in the attached image below.
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What is the term for a solution that is holding more dissolved solute than it should be able to at a particular temperature?
Explanation:
Sometimes, a solution contains more dissolved solute than is normally possible. This type of solution is said to be supersaturated. A saturated solution can become supersaturated if more solute is added while the temperature is raised.
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HELP !!
Question 5 Multiple Choice Worth 3 points)
(01.04 LC)
Which of the following is not an intensive physical property?
Magnetism
Boiling point
Thermal conductivity
Volume
It would be volume.
Volume is not an intensive property because it does change as the amount of substance increases or decreases. The rest of the properties are constant no matter the amount of substance.
Answer:
Volume
Look at the guy above me, okay-- they're smarter then me-
brainly or jiskha
choose wisely
Answer:brainly
Explanation:
absolutely brainly
full of help and knowledge
Enzymes which are usually increase the rate of a reaction by________.
Mendeleev's periodic table was organized by
mendeleev arranged the elements in order of increasing relative atomic mass. When he did this he noted that the chemical properties of the elements and their compounds showed a periodic trend
Answer:
Left to right
Elements are arranged by increasing atomic mass
HELPPP ANSWERS ????
A: 3
B: 2
C: 1
D: 4
Answer:
B. 2
Explanation:
We see from the reaction side of the equation that we have 2 Li. That means we need the same number of Li on the products side. Therefore, our only option is 2.
Answer:
b
Explanation:
Ahmed is trying to write a focused scientific question. "He writes, "Are the tides changing because of the Moon?" How could Ahmed's question best be rewritten
"Is the Moon's gravitational force affecting the tides on Earth?"
someone help. what is the missing word?
a. acceleration
----------------------
What is the mass in grams of each of the following samples? 1.505 mol of Ti 0.337 mol of Na
Answer:
72.04g Ti and 7.75g Na
Explanation:
1.505 mol Ti x (47.87g/1 mol) = 72.04g Ti
0.337 mol Na x (22.99g/1 mol) = 7.75g Na
72.04g Ti and 7.75g Na mass in grams of these samples.
What is molecular mass ?Molecular mass can be determined by the measure of mass related to a molecule which is otherwise called as atomic weight, means the mass of every atom present in the molecule.
For example, water have 2 hydrogen atoms and 1 oxygen atom, the molecular mass of water is equals to the normal atomic mass of hydrogen increased by two or more the atomic mass of oxygen.
molecular mass can be controlled by many factors like Mass Spectrometry which is used to decide the mass of little molecule which is otherwise called as monoisotopic mass.
It can also be controlled by Hydrodynamic Strategy requires calibration and determine the relative atomic weight; Static Light Scattering where the Molecular weight is determined from the measure of light dispersed utilizing the Zimm technique.
So, 1.505 mol Ti x (47.87g/1 mol) = 72.04g Ti
0.337 mol Na x (22.99g/1 mol) = 7.75g Na, hence the answer is 72.04g Ti and 7.75g Na
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Chromium(III) oxide reacts with hydrogen sulfide (H2S) gas to form chromium(III) sulfide and water: Cr2O3(s) + 3H2S(g) → Cr2S3(s) + 3H2O(l) To produce 156 g of Cr2S3, (a) how many moles of Cr2O3 are required? mol (b) how many grams of Cr2O3 are required? g
Answer:
(a) 0.779 mol Cr₂O₃
(b) 118 g Cr₂O₃
Explanation:
Step 1: Convert 156 g Cr₂S₃ to moles
Cr Molar Mass - 52.00 g/mol × 2 = 104.00 g/mol
S Molar Mass - 32.07 g/mol × 3 = 96.21 g/mol
156 g Cr₂S₃ ÷ 200.21 g/mol = 0.779182 mol Cr₂S₃
Step 2: Find conversion from Cr₂S₃ to Cr₂O₃
1 mol Cr₂S₃ equals 1 mol Cr₂O₃
Step 3: Use Dimensional Analysis
0.779182 mol Cr₂S₃ · [tex]\frac{1 \hspace{2} mol \hspace{2} Cr_2O_3}{1 \hspace{2} mol \hspace{2} Cr_2S_3}[/tex] = 0.779182 mol Cr₂O₃
0.779182 mol Cr₂O₃ ≈ 0.779 mol Cr₂O₃ (3 significant figures)
Step 4: Convert moles to grams
Cr Molar Mass - 52.00 g/mol × 2 = 104.00 g/mol
O Molar Mass - 16.00 g/mol × 3 = 48.00 g/mol
0.779182 mol Cr₂O₃ · 152.00 g/mol = 118.436 g Cr₂O₃
118.436 g Cr₂O₃ ≈ 118 g Cr₂O₃ (3 significant figures)
Explain the role that gravitation played in the formation of the Moon after the large planetesimal hit Earth.
Answer:
The gravity pulled the bits back and formed a ball which is the moon
Explanation:
hope this helps :)
Answer:
While some of the debris from the collision merged back into Earth, the gravity caused the accretion of much of the debris into a separate ball, forming the Moon.
Explanation:
Observe: The Hollow pipe allows the water in each flask to move around and mix. Try several experiments with different temperatures in the top and bottom flasks.
Describe what you see
What is the mass, in grams, of the ethyl alcohol that exactly fills a 220 mL container? The density of ethyl alcohol is 0.789 g/mL. Group of answer choices 170 g 173.58 g 280 g 278.833967 g
Answer:
[tex]m=173.58g[/tex]
Explanation:
Hello,
In this case, since the density is the ratio of the mass and volume:
[tex]\rho =\frac{m}{V}[/tex]
For the given density and volume, the correct mass which fills the given volume is:
[tex]m=\rho *V=0.789g/mL*220mL\\\\m=173.58g[/tex]
Best regards.
which argument best explains the charge of an atomic nucleus
Answer:
An atomic nucleus is positively charged because it is composed of protons.
Explanation:
hope this helps you:)
Answer:
An atomic nucleus is positively charged because it is composed of protons.
Explanation: Just took test on edgenuity
Who were the terrorists that attacked the united states on September 11, 2001
The class measured the density of a copper block to be 8.6 +/-0.2 g/cm3 at the 95% confidence interval with a standard deviation of 0.4 g/cm. The true density of copper is 8.96 g/cm3.
a. What is the high and low number of the confidence interval range? Does the true value fall within the confidence interval?
high:
low:
within range?
b. What is the high and low of the standard deviation range? Does the true value fall within the standard deviation?
high:
low:
within range?
Answer: kindly check explanation
Explanation:
Given the following :
Measured density of copper block:
8.6+/-0.2 g/cm3
True density = 8.96g/cm3
Standard deviation = 0.4g/cm
a. What is the high and low number of the confidence interval range?
High : 8.6 + 0.2 g/cm3 = 8.8g/cm³
Low : 8.6 - 0.2 g/cm3 = 8.4g/cm³
Does the true value fall within the confidence interval? NO
Actual density = 8.96g/cm³ doses not lie in between (8.4 - 8.8)g/cm³
B.) High and low of the standard deviation range?
High = 8.6 + 0.4 = 9.0g/cm³
Low = 8.6 - 0.4 = 8.2g/cm³
Value falls within range of the true density value of copper block.
8.96g/cm³ falls in-between (8.2-9.0)g/cm³
Was the french revolution driving force behind the metric system?
Answer:
yes, they were
Explanation:
The history of the metric system began in the Age of Enlightenment with notions of length and weighttaken from natural ones, and decimal multiples and fractions of them. The system became the standard of France and Europe in half a century. Other dimensions with unity ratios[Note 1] were added, and it went on to be adopted by the world.
(b) Draw the structure of the products when cyclopentene is reacted with:
(i) Cold alkaline KMnO4
Answer:
See explanation and image attached
Explanation:
When an alkene is reacted with cold, dilute and alkaline KMnO4, the product of the reaction is a 1,2-diol (vicinal diol). The products exhibit a “syn” stereochemistry with the addition of the two -OH groups to the same side of the alkene.
The reaction of cyclopentene with cold, dilute, alkaline KMnO4 is shown in the image attached.
In the given query, when cyclopentene is reacted with cold alkaline [tex]\rm KMnO_4[/tex], the product formed is cis-1,2-cyclopentanedicarboxylic acid (image attached below).
The reaction proceeds via oxidative cleavage of the double bond in cyclopentene to form two carboxylic acid groups.
The potassium permanganate ([tex]\rm KMnO_4[/tex]) acts as a strong oxidizing agent and cleaves the double bond to form two carboxylic acid groups.
The reaction can be represented as follows:
Cyclopentene + cold alkaline [tex]\rm KMnO_4 \rightarrow[/tex] cis-1,2-cyclopentanedicarboxylic acid
Therefore, the product, cis-1,2-cyclopentanedicarboxylic acid (refer to the attached image below), has a cyclopentane ring with two carboxylic acid groups attached to the 1 and 2 carbons, respectively.
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What is neither water nor land, and is always soaking wet?
Answer:
like mud
Explanation:
Answer:
wetland
Explanation:
a wetland is a region where water body meets land area
how do you make chocolate milk
Uranium is a type of atom. In special circumstances that usually involve high amounts of energy, uranium can be broken. When this occurs, different pieces of the original atom remain, including a substance called plutonium. Which statement most likely describes plutonium? It will still be uranium, just smaller pieces of uranium. It must no longer be a form of matter. It must be a different kind of atom. It will be different than, but have the same properties as, uranium.
Answer:
It's c
Explanation:
I'm taking the test now on edge.
It must be a different kind of atom statement mostly likely describes plutonium. Hence option C is correct.
What are atoms?It is the smallest unit of matter that possess the properties of the chemical element. It can’t be an independently, they form ions and molecules they both are combine and form large numbers of matters.
Atoms are basically three types: Neutrons, protons and electrons.
In periodic table plutonium is above uranium. Plutonium is more powerful as compared to uranium because it is an isotope and more radioactive.
Almost all of naturally occurring. Uranium 92U238with a half-life of 4.468 x 109 year. Most rest of the natural uranium is92U235.
Uranium is generally used in the process of nuclear fission whereas plutonium is used for the production of nuclear weapons.
It must be a different kind of atom statement mostly likely describes plutonium. Hence option C is correct.
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Some studies have found that when a person mimics an angry expression, their temperature actually rises.
O A True
OB.
False