Answer:
The nucleus is a collection of particles called protons, which are positively charged, and neutrons, which are electrically neutral. Protons and neutrons are in turn made up of particles called quarks. The chemical element of an atom is determined by the number of protons, or the atomic number, Z, of the nucleus.
Which of the following pairs would most likely form a covalent compound?
OK and Cl
Na and Br
OH and O
Mg and O
Out of the given pairs, the most likely to form a covalent compound are OK and Cl, OH and O, and Mg and O. Covalent compounds are formed when two nonmetals share electrons to form a stable molecule.
In the case of OK and Cl, both are nonmetals and are likely to share electrons to form a stable compound. The same is true for OH and O, which are also nonmetals that can share electrons to form a stable molecule.
On the other hand, Na and Br are both metals and are unlikely to form a covalent bond. Instead, they are more likely to form an ionic compound where one element donates an electron to the other. Mg is also a metal and is unlikely to form a covalent bond with O. Rather, they are more likely to form an ionic bond where Mg donates two electrons to O.
In conclusion, OK and Cl, OH and O, and Mg and O are the pairs most likely to form covalent compounds because they are made up of two nonmetals that can share electrons to form a stable molecule.
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What will be the [OH-], [H3O], pH and pOH of a 0. 025 M weak acid olution? (pKA= 4. 615)
The [OH-] of the 0.025 M weak acid solution will be equal to the pKA of the acid, 4.615.
What is weak acid solution?
A weak acid solution is a solution that contains an acid that is not completely ionized in water. Weak acids, such as acetic acid, have pH values between 4.5 and 6.0. These acids are not strong enough to completely break apart in water, leaving some of the molecules still intact. Because of this, weak acids form molecules that can react with other molecules, such as bases, in solution.
This is because the equilibrium of the acid dissociation reaction is reached with the same concentration of acid and its conjugate base in solution. The [H3O] will be equal to 0.025 M, as the acid is in dissociation equilibrium with its conjugate base. The pH of the solution can be calculated by taking the negative log of the [H3O], which will be 1.59. The pOH can be calculated by taking the negative log of the [OH-], which will be 4.615.
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The seven diatomic elements (exist as two atoms bonded together in nature) are hydrogen (H2), Nitrogen (N2), Oxygen (O2), Fluorine (F2), Chlorine (C2), Iodine (I2) and Bromine (B2). Based on the position of the seven elements that are diatomic when pure in nature and the trends of the periodic table, which of the following characteristics would not describe them?
a) Smaller Atomic Radius
b) High Metallic Character
c) High Ionization Energy
d) High Electron Affinity
Answer:
Smaller Atomic Radius, High Ionization Affinity, and High Electron Affinity
[Note: It is Br2, not B2, the bomber]
Explanation:
a) Smaller Atomic Radius YES Each of these elements have a high number of electrons that nearly fill the lower energy orbitals, forcing the protons in the nucleus to cluster togeter more tightly.
b) High Metallic Character NO
c) High Ionization Energy YES - They want to keep their electrons, so the ionization energy is high.
d) High Electron Affinity YES They attract electons from anything that comes nearby.
hypothesize why carbohydrates are found in plant cell walls
Answer:
Plants can split starch into it's simpler glucose units for use as energy when needed. Cellulose is known as a structural carbohydrate because of the fibers formed by it's molecules. It is the major component of plant cell walls and comprises over half of the carbon found on planets.
Explanation:
I majored in Chemistry
Norepinephrine (NE) Multiple Choice O always has an inhibitory effect on the effector. has either an excitatory or inhibitory effect on the effector. O always has an excitatory effect on the effector. O < Prev 75 of 82 o gi en eL
Norepinephrine (NE) has either an excitatory or inhibitory effect on the effector. The answer is option B.
Norepinephrine (NE), also known as noradrenaline, is a hormone and neurotransmitter that belongs to the catecholamine family. It functions as a stress hormone, mobilizing the body and brain to action. When a person is under stress or threatened, norepinephrine is released into the bloodstream, which increases heart rate, blood pressure, and breathing rate, as well as increasing glucose production, to provide the body with energy.
Norepinephrine (NE) is a neurotransmitter that works by binding to adrenergic receptors on the surface of cells in the sympathetic nervous system, which controls the "fight or flight" response. This hormone regulates various bodily functions, including heart rate, blood pressure, and respiratory rate, among others. Norepinephrine (NE) acts as either an excitatory or inhibitory effect on the effector.
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the diels-alder reaction is one example of what type of reaction?
The Diels-Alder reaction is an electrocyclic process that involves the [4+2]cycloaddition of 2 and 4 electrons from the dienophile and 4 electrons from the conjugated diene (an alkene or alkyne).
What is a case of a Diels-Alder reaction?A conjugated diene and an alkene undergo a cycloaddition event in the Diels-Alder reaction. A 1,4-addition product is created by this reaction. The reaction of 1,3-butadiene with maleic anhydride serves as an example.
Which reaction most accurately sums up the Diels-Alder reaction?Consequently, [4+2] cycloaddition is the name given to the cyclic addition of diene and dienophile. This shows that a Diels-Alder reaction is best described by the [4+2] cycloaddition.
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What is the pOH in a solution that has pH = 11.39?
Answer:
2.61
Explanation:
pH+pOH=14, so sub in 11.39 for pOH, then subtract it over to get pH=2.61
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The ability of materials to act as conductors and insulators is relative. All materials, even those that are commonly classified as insulators, still allow some conduction of heat. For example, ceramic is a better conductor than Styrofoam. A ceramic mug filled with hot water feels warmer in your hand than a Styrofoam cup filled with hot water. However, ceramic is a worse conductor than metal. A metal mug filled with hot water would feel even hotter than the ceramic mug.
Which of the following accurately represents the relationship between ceramic and metal?
A
Metal and ceramic are equally effective conductors.
B
Metal is a better conductor than ceramic.
C
Metal is a better insulator than ceramic.
D
Metal does not conduct heat.
B. Metal is a better conductor then cramic
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4. Manik saw his father watering his garden plants in hot weather. He noticed that
water doesn’t stick to the plant leaves and leaves become dry but looked fresh. He asked
following questions to his teacher
a. Which tissue forms the outer covering of a plant and does it have a protective role
to play?How ?
b. Why does water not stick to the leaves?
Water does not stick to the leaves of the plant owing to the fact that the leaves has a waterproof cuticle.
What tissues protects the leaves?We know that the leaves are the parts of the plant that are involved in photosynthesis. Photosynthesis is the process by which green plants produce their own food in the presence of sunlight and chlorophyll. We know that the leave has an outer protective covering.
The tissue that plays this outer covering of a plant for is the epidermis and its waxy cuticle. It prevents damage to the plant.
Water does not stick to the leaves of the plant owing to the fact that the leaves has a waterproof cuticle.
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1)A circuit is switched on for 60s with a current of 4A. How much charge flowed?
Charge flowed : 240 Coulombs
Further explanationGiven
t = time = 60 s
I = current = 4 A
Required
Charge
Solution
General formula :
Q = I x t
Q = charge (electricity), C
Input the value :
Q = 4 x 60
Q = 240 Coulombs
What’s science in science
Answer:
Science is the pursuit and application of knowledge and understanding of the natural and social world following a systematic methodology based on evidence. Scientific methodology includes the following: Objective observation: Measurement and data (possibly although not necessarily using mathematics as a tool)
Explanation:
Answer:
Modern science is typically divided into three major branches that consist of the natural sciences (e.g., biology, chemistry, and physics), which study nature in the broadest sense; the social sciences (e.g., economics, psychology, and sociology), which study individuals and societies; and the formal sciences
Which of the three methods of recrystallization do you think will grow the largest crystals. Do you think the crystal growth by vapor diffusion or by layering will be better? Explain why.
The vapor diffusion method will grow the largest crystals
In comparing the three methods of recrystallization, which include slow evaporation, vapor diffusion, and layering, I believe that the vapor diffusion method will grow the largest crystals. This is because vapor diffusion provides a controlled, gradual change in concentration and temperature, allowing crystals to form and grow in a more organized manner. On the other hand, layering can also produce sizable crystals, but it might be less effective due to possible inconsistencies in the interface between the two solutions, which may affect the crystal growth. Overall, the vapor diffusion method offers the most favorable conditions for growing large, well-ordered crystals.
In summary, vapor diffusion is generally considered to be the method that promotes the growth of the largest crystals. The slow and controlled evaporation allows for a gradual supersaturation of the solute, resulting in the formation of larger and more well-defined crystals.
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Example of compound non polar covalent bond and polar covalent bond
Answer:
Explanation:
Nitrogen N2 has a non polar covalent bond.
Water H2O has polar covalent bonds between the H and O atoms.
Will the equilibrium constant for the reaction increase, decrease, or stay the same?.
When a stress is applied to a reaction at equilibrium, the equilibrium constant for that reaction will either increase, decrease, or remain constant.
Changes in concentration, pressure, and temperature are all stresses that can be applied to an equilibrium system, causing the equilibrium to shift in one direction or the other.
When a stress is applied to an equilibrium system, the equilibrium constant for the reaction can either increase, decrease, or remain constant depending on the nature of the stress applied. For example, if the concentration of one of the reactants or products is changed, the equilibrium constant will shift to compensate for the change.
The equilibrium constant for a reaction can increase, decrease, or remain constant when a stress is applied to the equilibrium system. The nature of the stress applied will determine the direction in which the equilibrium will shift to maintain the equilibrium constant.
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How many grams are in 26 moles of
magnesium hydroxide?
1,516.31168 grams of Magnesium Hydroxide
what is the difference between a strong and weak acid? select the best choice below to explain the difference.
Answer:
Explanation:
Strong acids ionize completely in water to.produce hydrogen ions or hydroxonium ions while weak acids ionize partially in water to produce hydrogen ions
what causes a pfd to wear out over time? washing it with soap and water storing it upside down exposure to cold air and rain exposure to ultraviolet rays from the sun
The PFD can wear out over time due to a number of factors and in addition to these factors, a PFD can also wear out due to normal wear and tear.
Exposure to ultraviolet rays from the sun.
The sun's ultraviolet rays can break down the synthetic materials that PFDs are made of, causing them to become brittle and less buoyant.
Storage in cold air and rain.
Exposure to cold air and rain can also weaken the materials of a PFD and make it less effective.
Washing with soap and water.
Washing a PFD with soap and water can remove the water-resistant coating, making it less buoyant.
Storing upside down.
Storing a PFD upside down can put stress on the seams and make them more likely to tear.
In addition to these factors, a PFD can also wear out due to normal wear and tear.
If a PFD is used frequently, it is important to inspect it regularly for signs of wear and tear.
If you notice any tears, rips, or other damage, it is time to replace the PFD.
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PFDs wear out over time because of exposure to the sun, frequent washing, and improper storage. It's essential to take care of them to extend their lifespan. Always follow the manufacturer's instructions.
Explanation:PFDs or Personal Flotation Devices, can wear out over time due to several causes. They are generally robust, designed to withstand harsh conditions, but they are not indestructible. Continual exposure to harsh environmental elements like ultraviolet rays from the sun can cause the materials in the PFD to degrade. In addition, frequent washing with soap and water can also wear down the materials over time. Lastly, improper storage such as storing it upside down can also contribute to the wear and tear.
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Which statement describes a condensation reaction?
A. monomers break away when one forms a double bond monomers break away with the addition of a water molecule.
B. Two monomers combine when one adds to the double bond of another.
C. Two monomers form a new bond with the loss of a water molecule .
The statement that describes a CONDENSATION reaction is that two monomers form a new bond with the loss of a water molecule . That is option C.
CONDENSATION REACTION involves the combination of two or more molecules(monomers) of water. In reaction, a new bond is usually formed.
The characteristics of a condensation reaction includes:
formation of complex molecules (combination of two smaller monomers),water is usually given off as by product it requires a catalyst for a complete reaction to occurA reaction is called a condensation reaction because a small molecule such as water is released as a byproduct.
A typical example of a condensation reaction is the condensation of amino acids to form dipeptide. The −OH from the carboxyl group of one amino acid combines with a hydrogen atom from the amine group of the other amino acid to produce water.
Therefore, the statement that describes a CONDENSATION reaction is that two monomers form a new bond with the loss of a water molecule. That is option C
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Edward is gathering physical evidence at the scene of a crime. He finds a fingerprint pressed into the wax of a candle. What type of fingerprint is this?
The type of fingerprint found at the crime scene in this scenario is referred to as plastic.
What is Plastic fingerprint?This is the of fingerprint which is three dimensional and can be easily seen with the human eye.
Plastic fingerprint can be made by pressing the finger on substances such as wax, paint etc.
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Answer:
the answer would be molded I believe.
choices are Latent,patent, inadmissible molded,trace.
What type of reaction would NI3+ ->lead to?
Answer:
Reduction potential (Eo) is defined as a tendency of a chemical species to be reduced by gaining an electron and is defined with electrochemical reference of hydrogen, which is globally given the reduction potential of zero [24].
Explanation:
Select the correct answer. Light ray A moves from air to water. Part of ray A is reflected at the air-water boundary. Which arrow in the image is the reflected ray? A picture shows a light ray A moving from air to water. Ray B moves from water to air. The rays C and D move down inside the water and the ray E moves along the surface of the water. A. B B. C C. D D. E
Answer:
The correct answer is A. B. The arrow in the image that represents the reflected ray is the one labeled "B," which shows the direction of the ray after it has bounced off the air-water boundary.
how many electrons does Neon-21 have?
Answer:
10 electrons
Explanation:
Neon 21 has 10 protons and 11 neutrons. We know that there are the same number of electrons as there are protons. so your answer is 10.
Why do some substances float on water?
they are less dense
than water
they are warmer
than water
they are more
dense than water
Balanceo
Al + HCl AlCl3 + O2
Answer:
pls writ question well
Explanation:
I don't get
The Liquified Petroleum Gas (LPG) has the composition of 60% Propane (C 3
H 8
) and 40% Butane (C 4
H 10
) by volume: (a) Find the wet volumetric and gravimetric analysis of the products of combustion when the equivalence ratio (Φ)=1.0. (b) What is the stoichiometric air to fuel ratio for the LPG.
Evaluate the following:
a.) If M is a 2 × 2 matrix with det M = −2. What is det((3M)
-1 ) and det(3M-1) ?
b.) If A is a 5 × 5 matrix and det((2A) -1 ) = 1/8.
Find det A.
c.) If A and B are 3 × 3
a.) If M is a 2 × 2 matrix with det M = −2, and we want to find det((3M)-1) and det(3M-1),
then the formula to use is:
$$\det(cM) = c^n\det(M)$$ where $n$ is the order of matrix $M$.
1. Find det((3M)-1):
$$\begin{aligned}\det((3M)^{-1})&=\dfrac{1}{\det(3M)}\\\\&=\dfrac{1}{3^2\det(M)}\\\\&=\dfrac{1}{9(-2)}\\\\&=-\dfrac{1}{18}\end{aligned}$$
Therefore, det((3M)-1) = -1/18.
2. Find det(3M-1):
$$\begin{aligned}\det(3M-1)&=3^2\det(M-1/3)\\\\&=9\det(M-1/3)\\\\&=9\left|\begin{matrix}a-1/3 & b \\ c & d-1/3\end{matrix}\right|\\\\&=9\left(ad-\dfrac{a}{3}-\dfrac{d}{3}+\dfrac{1}{9}\right)\\\\&=3(3ad-a-d+1/3)\\\\&=9\det(M)-3\det(I)\\\\&=9(-2)-3(1)\\\\&=-21\end{aligned}$$
Therefore, det(3M-1) = -21.
b.) If A is a 5 × 5 matrix and det((2A)-1) = 1/8, then:
$$\begin{aligned}\det(2A)^{-1}&=\dfrac{1}{\det(2A)}\\\\\Rightarrow\dfrac{1}{8}&=\dfrac{1}{2^5\det(A)}\\\\\Rightarrow \det(A)&=2^5(8)\\\\&=256\end{aligned}$$
Therefore, det A = 256.
c.) If A and B are 3 × 3 matrices such that $\det(A) = 150$ and $\det(B) = 3$, then:
1. det(2A) = $2^3\det(A)$ = $2^3\times150$ = 1200
2. det(A + B) $\neq\det(A) + \det(B)$ (property does not hold true for addition)
3. det(AB) = $\det(A)\det(B)$ = $150\times3$ = 450
Therefore, det(2A) = 1200, det(A + B) $\neq$ det(A) + det(B), and det(AB) = 450.
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15) Of the following, __________ is a weak acid. A) HF B) HCl C) HBr D) HNO3
E) HCIO4
Answer: A) HF (hydrofluoric acid)
Explanation:
based on electronegativity trends in the periodic table, predict with of the following compounds will have the greatest % ionic character in it bonds?
The following compounds' SrF2 will have the highest percentage of ionic character in its bonds, according to trends in electronegativity in the periodic table.
Describe Electronegativity?
The propensity of the given element to draw the shared electron during the formation of a chemical bond is referred to as electronegativity. It depends on the atomic number of the target atom as well as how far away the shared electron is from the charged atom's nucleus.
Ionic character: An object's ionic character is determined by how much the electronegativity of two covalently connected atoms differs from one another.
The most ionic property of all is found in BaCl2.
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On the basis of the electronegativity trends in the periodic table, SrF2 of the following given compounds should have the greatest % ionic character in its bonds.
What is electronegativity?While forming a chemical bond the tendency of the given element to attract the shared electron is known as electronegativity. It is affected by the atomic number of the given atom as well as the distance at which the shared electron resides from the charged nucleus of the atom.
Ionic character:The ionic nature is determined by how much the electronegativity of two covalently bound atoms differs from one another.
BaCl2 has the greatest of all ionic character.
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sodium chloride is a buffer creating an injectable solution that is isotonic. group of answer choices true
Yes, the statement is True i.e. Sodium chloride is a buffer creating an injectable solution that is isotonic.
A buffer solution, also referred to as a pH buffer or hydrogen ion buffer, is an aqueous mixture of a weak acid and its conjugate base, or vice versa. The pH scarcely changes at all when a small amount of a strong acid or basic is added to it. Buffer solutions are used in a wide range of chemical processes to keep pH values almost constant. Buffering is used by many living systems to regulate pH in the natural world. For instance, the bicarbonate buffering system regulates the pH of blood, and bicarbonate also acts as a buffer in the ocean. Because of a chemical equilibrium between the weak acid HA and its conjugate base A, buffer solutions are resistant to pH change: HA ⇌ H+ + A− According to Le Chatelier's principle, an equilibrium between a weak acid and its conjugate base shifts to the left when hydrogen ions (H+) are supplied. Because of this, despite the supply of strong acid, the concentration of hydrogen ions increases less than anticipated.
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What is the∆S° of 0₂
Answer:0
Explanation: zero because it is the most stable form of oxygen in its standard state