A sample of an ideal gas has a volume of 2.27 L at 285 K and 1.10 atm. The pressure when the volume is 1.36 L and the temperature is 306 K is 1.77 atm.
What is an ideal gas equation ?
The ideal gas equation is represented as: PV = nRT. In this equation, P refers to the pressure of the ideal gas, V is the volume of the ideal gas, n is the total amount of ideal gas that is measured in terms of moles, R is the universal gas constant, and T is the temperature.
Given:
P1 = 1.10 atm
V1 = 2.27 L
T1 = 285 K
P2 = ?
V2 = 1.36 L
T2 = 306 K
By an ideal gas equation, we get
P2V2/T2 = P1V1/ T1
P2 = T2P1V1/ V2T1
= 306 × 1.10 × 2.27 / 1.36 × 285
= 764 / 387.6
= 1.77 atm
Thus, the pressure when the volume is 1.36 L and the temperature is 306 K is 1.77 atm.
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Which of the following reagents or sequences do not produce an alcohol or diol from an alkene starting material?
A)H+, H2O
B)HCO3H
C)BH3.THF followed by H2O2, NaOH
D)Hg(OAc)2, H2O followed by NaBH4
E) OsO4, H2O2
The reagent or sequence that does not produce an alcohol or diol from an alkene starting material is HCO3H. So, the correction option is B.
HCO3H is the only reagent or sequence that does not produce an alcohol or diol from an alkene starting material.
While the options are incorrect because:
A) H+, H2O can produce an alcohol by addition of water to an alkene.
C) BH3.THF followed by H2O2, NaOH can produce an alcohol via reduction of the alkene.
D) Hg(OAc)2, H2O followed by NaBH4 can produce a diol via addition of two equivalents of water to the alkene.
E) OsO4, H2O2 can produce an alcohol by reduction of an epoxide intermediate.
In summary, B) HCO3H is the only reagent or sequence that does not produce an alcohol or diol from an alkene starting material.
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classify each of the following materials as to whether it is a metal, ceramic, or polymer. justify each choice: (a) brass; (b) magnesium oxide (MgO); (c) Plexiglas; (d) polychloroprene; (e) boron carbide (B4C); and f cast iron.
(a) Brass is an alloy of copper and tin, both of which are metals. So, brass is a metal.
(b) Magnesium oxide is a ceramic as it is an oxide of magnesium.
(c) Consider Plexiglas as polymer as its real name is poly methyl methacrylate or acrylic.
What is polymer ?Polymer is a library of web components that can be used to create user interfaces in web applications. It provides a set of reusable HTML elements, such as buttons, tabs, and sliders, to create interactive user experiences. Polymer uses the latest web technologies such as HTML5, JavaScript, and CSS to create a cohesive web development experience.
It also supports web components and shadow DOM, which allows developers to create custom elements that can be reused across multiple websites. Polymer makes it easy to create custom elements and components, and helps developers create responsive, accessible and maintainable web applications. Polymer is a great tool for creating modern web experiences with minimal effort.
(d) Polychloroprene is a polymer obtained by polymerization of chloroprene.
(e) Boron carbide is ceramic which is used in making bullet proof jackets. It is a combination of boron and carbon.
(f) Cast iron is a metal. It is an alloy of iron and carbon. The percentage of carbon in cast iron is much lesser than that of iron.
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Which of the following compounds have both polar covalent and ionic bonds? OA. NH4Br O B. H202 OC. HCN OD.H25 O E. None of these.
NH₄Br has both polar covalent and ionic bonds. The ionic bond is formed between the NH₄+ and Br- ions, and the polar covalent bond is formed between the N and the 4 H atoms.
H₂0₂, HCN, and H₂₅ do not have both polar covalent and ionic bonds, so the correct answer is None of these.
In addition to the polar covalent and ionic bonds, NH₄Br also contains hydrogen bonds. These hydrogen bonds are formed between the hydrogen atoms in the NH₄+ and Br- ions, and they help stabilize the ionic bond between them.
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When using a 10 ml graduated cylinder, it is initially filled with approximately how many milliliters of water?
5ml or 10ml
If a hydrogen (H) atom and a helium (He) atom travel at the same speed, which of the following is true about the de Broglie wavelengths of theA) The H atom is about 2 times longer than the He atom.
B) The H atom is approximately the same as the He atom.
C) The H atom is about 4 times longer than the He atom.
D) The He atom is about 2 times longer than the H atom.
E) The He atom is about 4 times longer than the H atom. atoms?
The de Broglie wavelengths of a hydrogen atom are around four times longer than a helium atom's if they move at the same speed.
The de Broglie wavelength is a fundamental concept in quantum physics. The wavelength () associated with an object in relation to its momentum and mass is known as the De Broglie wavelength. Typically, a particle's force and de Broglie wavelength are inversely related. It is asserted that matter has properties that are similar to both waves and particles. De Broglie waves are properties of a material thing that change over time or space while behaving like waves. They bear the discoverer Louis de Broglie's name. Additionally known as matter-waves. It is quite similar to the experimental evidence supports the dual nature of light, which exhibits both particle and wave behavior.
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Can you help me with this I can’t fully get it
The other answer are
41%
50%
33%
Thank u
The percent yield of the reaction is 50 %.
What is the percent yield?We know that we have to use the balanced reaction equation so as to solve the problem that we have at hand here now.
We know that;
Number of moles of oxygen = 160 g/32 g/mol
= 5 moles
We now know that the liming reactant in this case is the oxygen. Thus we can be able to write here that;
Thus we know that the theoretical yield of the CO2 = 3 * 44 = 132 g
The percent yield = 66/132 * 100
= 50 %
This is the percent of the product that we can be able to obtain.
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In a study to determine the rate of the following reaction:
2NO(g) + O₂(g) → 2NO₂(g)
the concentration of NO was 0.0450 M at t= 5.0 s and 0.0225 M at t= 650.0 s. What is the average rate of the reaction during this time period?
3.68*10-5 m/s is the average rate of the reaction during this time period.
What is rate of reaction?
A rate of reaction is the speed at which a chemical reaction takes place. It is usually expressed as the change in the concentration of a reactant or product per unit time. The rate of a reaction is determined by many factors, including the physical state of the reactants, the temperature, the concentration of the reactants, the presence of a catalyst, and the surface area of the reactants that are in contact with each other.
2NO(g)+O2(g) -> 2NO_2(g)
Rate = -1/2 d[No]/dt
Average Rate = -1/2[0.0225-0.0700/650-5]
= 3.68*10^-5 m/s
Therefore, 3.68*10-5 m/s is the average rate of the reaction during this time period.
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using the periodic table, identify the name and symbol of the three neutral atoms given their atomic numbers and masses. the neutral atom with an atomic number of 15 15 and a mass number of 31 31 . element name:
The neutral atom with an atomic number of 15 and a mass number of 31 is Phosphorus, with the symbol P.
Phosphorus is an element found in the periodic table with the symbol P and atomic number 15. It is a non-metal and has 5 electrons in its outer shell. It is classified as a non-metal due to its chemistry and the fact that it does not readily form compounds with other elements. Phosphorus is a key component in the production of many important compounds such as fertilizer and phosphoric acid. It is also an important component in the formation of DNA and RNA.
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which of the following graphs represents the functional relationship between the volume of a gas at constant p and t and its corresponding number of gas moles present in container?
The graph that represents the functional relationship between the volume of a gas at constant pressure and temperature and its corresponding number of gas moles present in the container is the Ideal Gas Law graph.
The Ideal Gas Law states that, at constant pressure and temperature, the volume of a gas is directly proportional to the number of moles of gas present in the container. This relationship can be represented by a straight line on a graph of volume versus number of moles.
The equation for the Ideal Gas Law is:
PV = nRT
where P is the pressure, V is the volume, n is the number of moles of gas, R is the gas constant, and T is the temperature.
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the complete question is:
which of the following graphs represents the functional relationship between the volume of a gas at constant p and t and its corresponding number of gas moles present in container?
A brain scan uses the radioisotope oxygen-15. The recommended dosage is 40 mCimCi. A supply of 260 mCimCi in 40 mL arrives at the lab. How many mL will be injected into a patient?
6.15 ml of 260 mCi will be injected into a patient.
What is radioisotope ?A radioisotope is an unstable form of an element created by bombarding the element with radiation. These unstable elements are known as radioactive isotopes and they continually decay and transform into different elements, releasing energy in the process. Radioisotopes are used in a variety of applications, including medical imaging, medical treatments, industrial processes, environmental monitoring, and scientific research. For example, technetium-99m is used to generate images in nuclear medicine and cobalt-60 is used to treat cancer. Radioisotopes can also be used to detect and measure the presence of pollutants in the environment and to study the origin and age of rocks and fossils.
We can use dimensional analysis to calculate the volume of the radioisotope supply solution that contains the required
40 mCi as follows:
[tex]=\mathrm{\dfrac{40 ml}{ 260 mCi} \times 40 mCi \\}\\[/tex]
[tex]=\mathrm{\dfrac{40 ml}{13 mCi} \times 2mCi \\}\\[/tex]
[tex]=\mathrm{\dfrac{80 ml}{13 } \\}\\[/tex]
= 6.15 ml
Thus, 6.15 ml of 260 mCi will be injected into a patient.
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c. 350 mL of water at 32 °C was poured into a 250 mL of water at 84 °C.
The final temperature of this mixture was measured to be 41.33 °C. Is this final temperature possible? Justify your reasoning.
The correct final temperature is 53.7°C
What happens to the temperature of water when mixed?The temperature of water when mixed with another substance will depend on the temperature of the other substance and the amount of energy transferred between the two substances.
If the other substance has a higher temperature than the water, heat energy will flow from the hotter substance to the cooler water, and the temperature of the water will increase until thermal equilibrium is reached.
We know that heat gained = Heat lost
We the have that;
350 * 4.2 * (T - 32) = -250 * 4.2 * (84 - T)
1470T - 47040 = -88200 + 1050T
T = 53.7°C
The final temperature of the mixture is 53.7°C.
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A gas has a pressure of 1.43 atm and occupies
a volume of 7.7 L. If the gas is compressed to
a volume of 1.64 L, what will its pressure be,
assuming constant temperature?
According to Boyle's law: P1V1=P2V2
Here
P1=1.43atm:
V2=L:V
1
=
L
⇒
P
2
=
×
⇒
P
2
=
a
t
m
Therefore, the pressure of gas =
3 cu 8hno3 --> 3 cu(no3)2 2 no 4 h2o in the above equation how many moles of water can be made when 137.6 grams of hno3 are consumed? round your answer to the nearest tenth.
0.9 moles of water can be made when 137.6 grams of hno3 are consumed.
The mole, symbol mol, is the unit of amount of substance in the International System of Units. The quantity amount of substance is a measure of how many elementary entities of a given substance are in an object or sample. The mole is defined as containing exactly 6.02214076×10²³ elementary entities.
1 mole of HNO3 means 63g HNO3 and we have, 8 moles HNO3
To calculate moles of water can be made when 137.6 grams of hno3 are consumed,
112.6g HNO3 x 1 mole HNO3 x 4 moles H2O = 0.9 moles H2O
0.9 moles of water can be made when 137.6 grams of hno3 are consumed.
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Elements with atomic numbers of 104 and greater are known as super-heavy elements. None of these elements have been found in nature but instead have been made in a laboratory. They are very difficult and expensive to create, and they break down into other elements quickly. There currently are no practical applications for any of these elements. However, some scientists believe that, with further work, they may discover some isotopes of super-heavy elements that are more stable and that could possibly have practical implications. Do you think that scientists should continue to try to create super-heavy elements and expand the periodic table? Explain why or why not.
Answer:
Explanation:
Argument for continuing to create super-heavy elements:
-The periodic table is one of the most important and widely used tools in chemistry. Expanding it would increase our understanding of the elements and their properties.
-Discovering new elements and isotopes can lead to unexpected scientific breakthroughs and advancements.
-The creation of super-heavy elements involves cutting-edge technology and scientific expertise, which can push the boundaries of human knowledge and drive innovation.
Argument against continuing to create super-heavy elements:
-The process of creating super-heavy elements is extremely difficult and expensive. There may be more pressing scientific problems that deserve funding and resources.
-The super-heavy elements are highly unstable and break down quickly, so it is unlikely that any practical applications will ever be found.
-The production of super-heavy elements requires the use of high-energy particle accelerators, which can generate hazardous by-products and waste.
Determine the coordination number of the Pb2+ ion in CH3NH3PbI3, which possesses the perovskite structure and has recently been extensively investigated as a new type of solar cell material
The coordination number of the Pb²⁺ ion in CH₃NH₃PbI₃ is 6. It forms an octahedral arrangement with the six iodine atoms surrounding the central Pb²⁺ ion.
What is a coordination number?The coordination number of an ion refers to the number of other ions or molecules surrounding it and coordinating with it through bonds. In the case of cations like Pb²⁺, the coordination number indicates the number of surrounding anions that are coordinated with the cation through ionic bonds.
The coordination number is important in determining the physical and chemical properties of compounds and in understanding their structures and reactivity.
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As discussed in the introductory text, archaeans do NOT appear to use the Embden-Meyerhof-Parnas (glycolytic) pathway. Instead, they use alternate pathways to metabolize sugars. What is the function of this pathway in organisms that do use it?Choose the best answera. Glucose is used to synthesize two molecules of pyruvate with a net gain of 2 ATP and 2 CO2.b. Glucose is split into two molecules of pyruvate with a net gain of 2 ATP and 2 NADH (regenerated to c. NAD+ to maintain redox balance in the third stage of glycolysis)c. Glucose is split into two molecules of pyruvate, and then fermentation is always used to produce ethanol and CO2.d. Glucose is use to synthesize starch or glycogen with a net gain of 2 ATP and 2 NADH (regenerated to NAD+ to maintain redox balance in the third stage of glycolysis)
The function of the Embden-Meyerhof-Parnas (glycolytic) pathway in organisms that use it is to convert glucose into pyruvate with a net gain of 2 ATP and 2 NADH (regenerated to NAD+ to maintain redox balance in the third stage of glycolysis) (option B).
This pathway takes place in the cytoplasm of cells and is the first stage of cellular respiration. During glycolysis, glucose is split into two molecules of pyruvate, which can then enter the citric acid cycle (also known as the Krebs cycle) for further oxidation and energy production in the presence of oxygen. If oxygen is not available, pyruvate can undergo anaerobic fermentation to produce lactate or ethanol and CO2, depending on the organism.
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Suppose an alpha particle (composed of 2 protons and 2 neutrons) is given 482.0 keV of kinetic energy
An alpha particle is a particle composed of two protons and two neutrons. When given 482.0 keV of kinetic energy, the alpha particle will move at a high velocity.
This energy can be converted into other forms of energy, such as potential energy, depending on the situation. For example, if the alpha particle were approaching a massive object, some of the kinetic energy would be converted into potential energy as the particle moves closer to the object.
In addition, the alpha particle will also interact with other particles in its environment. When it collides with other particles, its kinetic energy can be converted into thermal energy, resulting in an increase in temperature.
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art a classify each process as an endothermic or exothermic process. drag the appropriate items to their respective bins.
Forming solute solvent interaction - Endothermic
Breaking solvent solvent interaction - exothermic
Breaking solute solute interaction - exothermic
What is endothermic and exothermic?Endothermic reactions are reactions that absorb energy from their surroundings, usually in the form of heat. These reactions are characterized by a decrease in temperature and the absorption of heat energy by the reaction. For example, dissolving ammonium nitrate in water is an endothermic reaction because it absorbs heat from the surrounding environment, causing the water to cool.
Exothermic reactions are reactions that release energy to their surroundings, usually in the form of heat. These reactions are characterized by an increase in temperature and the release of heat energy by the reaction. For example, the combustion of a hydrocarbon fuel such as gasoline is an exothermic reaction because it releases heat energy to the surrounding environment, causing the temperature to increase.
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Gaseous butane (CH₂(CH₂)₂CH₂) will react with gaseous oxygen (0₂) to produce gaseous carbon dioxide (CO₂) and gaseous water (H₂O). Suppose 30.8 g
of butane is mixed with 74. g of oxygen. Calculate the minimum mass of butane that could be left over by the chemical reaction. Be sure your answer has the
correct number of significant digits.
The minimum amount of butane that could be left over by the chemical reaction would be 10.12 grams.
Stoichiometric problemThe equation of the reaction would be as follow:
[tex]2C_4H_{10} + 13O_2 -- > 8CO_2 + 10H_2O[/tex]
Mole ratio of butane to oxygen = 2:13
Mole equivalence of 30.8 g of butane = 30.8/58.12 = 0.5299 mol
Mole equivalence of 74 g of oxygen = 74/32 = 2.3125 mol
From the mole ratio, the actual amount of butane required for 2.3125 mol of oxygen:
2/13 x 2.3125 = 0.3558 mol
Excess mol of butane = 0.5299 - 0.3558 = 0.1741 mol
Mas of 0.1741 mol butane = 0.1741 x 58.12
= 10.12 grams
In other words, the minimum mass of butane that could be left over by the chemical reaction is 10.12 grams.
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difference between coal iron and electric iron
When the high and low air masses are close together, air moves _____, so wind is ____.
Question 3 options:
faster; stronger
faster; weaker
slower; stronger
slower; weaker
According to the forces of attraction, when the high and low air masses are close together, air moves slow so wind is stronger.
What are forces of attraction?Forces of attraction is a force by which atoms in a molecule combine. it is basically an attractive force in nature. It can act between an ion and an atom as well.It varies for different states of matter that is solids, liquids and gases.
The forces of attraction are maximum in solids as the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.
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why the depression in melting and boiling point of manganese and zinc?
The depression in melting and boiling point of manganese and zinc is caused by differences in atomic sizes.
Why the depression?We have to know that the boiling points of the elements that we have in the periodic table can be decided as we look at the periodic properties of the elements in the periodic table.
The depression in the melting and boiling points of manganese and zinc can be attributed to the decrease in the metallic bonding strength as the atomic size increases. Larger atoms have weaker metallic bonds, which leads to a decrease in the melting and boiling points. This trend is known as the atomic size effect.
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when 0.20 m nh4cl (aq) and 0.20 m naoh(aq) are mixed, the reaction represented by the equation above occurs and a strong smell of ammonia, nh3 is observed. based on this information, which of the following statements is true? And Why?
A) NH4 + (aq) acts as abronsted-Lowry
B) NH4 + (aq) is a stronger acid than H20
C) NH3(aq) is a stronger base than 0H+(aq)is
D) NH4+(aq) and CL(aq)are a conjugate acid base pair
The correct answer is D) NH₄+(aq) and Cl-(aq) are a conjugate acid-base pair, because, When NH4Cl(aq) is mixed with NaOH(aq), NH₄+ (aq) acts as a Bronsted-Lowry acid and reacts with the NaOH(aq) to form NH₃(aq) and Cl-(aq).
NH₃(aq) is a weaker base than OH-(aq), and NH₄+ (aq) is a weaker acid than H₂O, so neither of the other two options is correct.
The acid-base reaction also results in the formation of a salt, in this case NH₄Cl. This salt is composed of the conjugate acid (NH₄+) and the conjugate base (Cl-). This type of reaction is known as a neutralization reaction, as the result of the reaction is a neutral solution.
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20) Which of the following is an ionic compound?
B) PC15
A) SC12
C) C120
D) CH₂0
E) MgCl2
Answer: MgCl₂
Explanation:
Ionic compounds are composed of a metal and a nonmetal.
Mg (magnesium) is a metal and Cl (chlorine) is a nonmetal.
The answer is E) MgCl₂
A solution of ethanol (C2H6O) in water is sometimes used as a disinfectant. 1.00 L of this solution contains 553 g of ethanol and 335 g of water. What is the molality of the ethanol in this solution?
Answer:
The molality of a solution can be calculated by dividing the number of moles of solute (ethanol) by the mass of the solvent (water) in kilograms. To calculate the moles of ethanol, we need to know its molar mass:
C2H6O (ethanol) molar mass = 2(12.01 g/mol) + 6(1.01 g/mol) + 16.00 g/mol = 46.07 g/mol
Next, divide the total mass of ethanol (553 g) by its molar mass (46.07 g/mol) to get the number of moles:
553 g / 46.07 g/mol = 12.0 mol
Next, convert the mass of water (335 g) to kilograms:
335 g / 1000 g/kg = 0.335 kg
Finally, divide the number of moles of ethanol (12.0 mol) by the mass of water in kilograms (0.335 kg) to get the molality:
12.0 mol / 0.335 kg = 35.8 mol/kg (to 3 significant figures)
A galvanic cell is powered by the following redox reaction:
2IO₃⁻ (aq) + 12H⁺ (aq) + 10Cu⁺ (aq) → I₂ (s) + 6H₂O (I) + 10Cu²⁺ (aq)
Answer the following questions about this cell.
1. Write a balanced equation for the half-reaction that takes place at the cathode.
2.Write a balanced equation for the half-reaction that takes place at the anode.
3.Calculate the cell voltage under standard conditions. Round your answer to 2 decimal places.
Half-reaction at the cathode:
part 1.
The half-reaction at the cathode is the reduction of Cu2+ ions to Cu+ ions:
10Cu2+ (aq) + 2e- → 10Cu+ (aq)
part 2.
Half-reaction at the anode:
The half-reaction at the anode is the oxidation of IO3- ions to I2:
2IO3- (aq) → I2 (s) + 6e-
part 3.
The cell voltage under standard conditions is -0.20 V.
What is cell voltage?The difference in the electrical potential between two electrodes is described as the cell voltage.
The cell voltage under standard conditions is equal to the difference between the standard reduction potentials of the half-reactions:
Ecell = E°cathode - E°anode
Ecell = 0.34 V - (+0.54 V)
Ecell = -0.20 V
Rounding off to 2 decimal places:
Ecell = -0.20 V
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A car is travelling at 50.0 miles per hour. Express this speed in kilometers per hour (km/h). (1 mi = 1.609 km)
Answer: 80.45 km/h
Explanation:
50.0 mph x 1.609 =80.45 km/h
Consider the following reaction in aqueous solution: 5Br−(aq)+BrO3−(aq)+6H+(aq)⟶3Br2(aq)+3H2O(l)semantics
If the rate of disappearance of Br–(aq) at a particular moment during the reaction is 0.423 M/s, what is the rate of appearance of Br2(aq) at that moment?
According to chemical equilibrium,the rate of appearance of bromine at that moment is 0.577 M/s.
What is chemical equilibrium?Chemical equilibrium is defined as the condition which arises during the course of a reversible chemical reaction with no net change in amount of reactants and products.A reversible chemical reaction is the one wherein the products as soon as they are formed react together to produce back the reactants.
At equilibrium, the two opposing reactions which take place take place at equal rates and there is no net change in amount of the substances which are involved in the chemical reaction.The rate of appearance of bromine at that moment is 1-0.423=0.577= M/s.
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The symptom substitution conflict highlights a disagreement between psychoanalytic and behavioral theories concerning the
The symptom substitution conflict highlights a disagreement between psychoanalytic and behavioral theories concerning the causes of behavior.
About Psychoanalytic theoryThis is a theory that discusses the nature and development of human personality. The main elements in this theory are motivation, emotions and other aspects of personality.
The basis of psychoanalytic theory is to assume that personality will begin to develop when conflicts occur from the psychological aspects themselves. These symptoms usually occur in children or at an early age. Then Sigmund Freud's opinion about human personality is based on the experiences of his patients.
Sigmund Freud is a psychological scientist known for his ideas about human personality based on the analysis of his dreams, and his extensive reading of various scientific and human literature.
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describe the structure of an atom. identify the three major elementary particles noting their charge and location in an atom.
The three major elementary particles of atom are protons, neutrons and electrons.
An atom is described as a complex arrangement of negatively charged electrons arranged in defined shells about a positively charged nucleus. The nucleus contains most of the atom's mass and basically composed of protons and neutrons, except for common hydrogen which has only one proton.
Generally, atoms consist of three basic particles, protons, electrons, and neutrons. The nucleus present in the center of the atom contains the protons which are positively charged and the neutrons which have no charge. The outermost regions of the atom contains electrons which are negatively charged are called electron shells.
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