A limiting factor when it comes to applying motivation to employees in the hospitality industry is Payment structure.
What is the structure?The structure of a essay is straightforward and simple.It typically consists of an introduction, two to three body paragraphs and a conclusion. The introduction should introduce the main topic and provide a brief overview of what will be discussed. The body paragraphs should provide more specific details about the main topic and should include supporting evidence. The conclusion should summarize the essay and provide a final thought or opinion. It is important to keep in mind that the essay should be free of plagiarism, so it is essential to write all content in one’s own words.
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Continuing from the last question, what is the new pressure inside the container? hint: did we use up all of the reactants?.
The new pressure inside the container is 0.5 atm.
What is new pressure?New pressure is the term used to describe changes in the environment or circumstances that require a person or organization to adapt. This may include changes in technology, competition, customer preferences, and global markets. New pressure can also refer to the external forces that drive a business to continually innovate and adapt to stay competitive. It can be the result of rapid technological advances, a shifting global economy, or changing customer demands.
The pressure inside the container is equal to the partial pressure of the reactants when all of the reactants have been used up. Since the reaction is at equilibrium, this means that the pressure inside the container is equal to the partial pressure of the products, which is 0.5 atm. Therefore, the new pressure inside the container is 0.5 atm.
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Which best describes a chemical reaction that follows the law of conservation of matter
A. The reactants have the same mass as the product
B. The reactants have the same density as the product
C. The products conserves all physical properties of the reactant
D. The products conserve all chemical properties of the reactants
Answer:
A
Explanation:
The Law of Conservation of Matter says that the amount of matter (mass) stays the same, even when matter changes its form.
Sometimes a neutral oxygen (o) atom may gain electrons. when this happens, oxygen becomes a(n) _____ with a ______charge .
Sometimes a neutral oxygen atoms gains electrons. The oxygen then becomes an anion with a negative charge.
All the atoms undergoes chemical reactions to attain the octet electronic configuration. It means that it tries to attain the configuration of noble gases, which has the most stable atoms.
Oxygen has 6 electrons in its outer shell. It accepts two more electrons to attain the configuration of neon. As it attains electrons the atoms become negatively charged ions, called anions. It will now become O²⁻.
So the oxygen atom attains electrons to become an anion, with negative charge.
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The strength of mild steel is found to be 232.9 MPa when the grain size is 17.43 pm. and 874.2 MPa when the grain size is 0.80 um. 1. Determine the constants in the Hall-Petch equation. (Express your answer to three significant figures.) K =_____MPa um 0o =______MPa 2. Determine the strength of the mild steel when the grain size is reduced to 0.160 pm. (Express your answer to three significant figures.) 0 = MPa
When the grain size is reduced to 0.160 pm, the strength of mild steel is 1851 MPa.There are a number of variables that can affect mild steel's strength, including the grain size, which is controllable.
We may use the above information to determine the constants in the Hall-Petch equation: The strength of mild steel at grain size d1 = 17.43 pm is 1 = 232.9 MPa. Mild steel has a strength of 2 = 874.2 MPa when the grain size is d2 = 0.80 um (or 800 nm). This is the formula for the Hall-Petch equation: = o + Kd(-1/2). We can use the following equation to determine K: K = (σ2 - σ1)(d2^(1/2) - d1^(1/2))^(-1) (-1) When the values are plugged in, we get the following result: K = (874.2 - 232.9)(800(1/2) - 17.43(1/2))(-1) = 276.3 MPa um(1/2) We can use the following equation to determine o: σo = σ1 - Kd1^(-1/2) Plugging in the numbers yields the following result: o = 232.9 - 276.3(17.43(-1/2)) = 62.28 MPa. The Hall-Petch equation's constants are K = 276.3 MPa um(1/2) and o = 62.28 MPa. Hence, the power of the yield strength of mild steel at 0.160 pm grain size is 1851 MPa.
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How many grams are in 1. 50 moles of KMnO4?
A. 165. 06
B. 660. 24
C. 237. 06
D. 484. 29
After calculation of molar mass, The amount of grams in 1.50 moles of KMnO4 is 237.06 hence its is the Option C
The question asks to calculate the mass of 1.50 moles of KMnO4. To do this, we need to know the molar mass of KMnO4, which is calculated by adding up the atomic masses of each element in the compound, taking into account their respective number of atoms. For KMnO4, the molar mass is 39.10 + 54.94 + 4(16.00) = 158.03 g/mol.
Once we have the molar mass, we can use the formula mass = number of moles x molar mass to find the mass of 1.50 moles of KMnO4. Substituting the values, we get:
mass = 1.50 moles x 158.03 g/mol = 237.06 g
Therefore, the answer is (C) 237.06 g.
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What NaCl concentration results when 279 mL of a 0.680 M NaCl solution is mixed with 462 mL of a 0.450 M NaCl solution?
Answer:
0.54 M NaCl.
Explanation:
The final concentration of the mixture can be found using the formula for the dilution of a solution:
C1 * V1 + C2 * V2 = C_final * (V1 + V2)
where C1 and C2 are the initial concentrations of the two solutions, V1 and V2 are their volumes, and C_final is the final concentration of the mixture. Plugging in the given values, we get:
0.680 M * 279 mL + 0.450 M * 462 mL = C_final * (279 mL + 462 mL)
0.680 M * 279 mL + 0.450 M * 462 mL = C_final * 741 mL
0.680 M * 279 mL + 0.450 M * 462 mL = C_final * 0.741 L
Converting volumes to liters:
0.680 M * 0.279 L + 0.450 M * 0.462 L = C_final * 0.741 L
0.680 M * 0.279 L + 0.450 M * 0.462 L = C_final * 0.741 L
0.190982 + 0.209719 = C_final * 0.741 L
0.400701 = C_final * 0.741 L
Dividing both sides by 0.741 L:
0.400701 / 0.741 L = C_final
So, the final concentration of the mixture is 0.54 M NaCl.
Which of the following laws demonstrates a DIRECT relationship? (choose all that apply)
a
Charles' Law
b
Avogadro's Law
c
Boyle's Law
Charles' Law and Avogadro's Law demonstrates a direct relationship. Therefore, option A and D are correct.
What does Charles Law states ?Charles' law states that the volume of a gas equals a constant value multiplied by its temperature as measured on the Kelvin scale (zero Kelvin corresponds to -273.15 degrees Celsius).
Charle's law is a direct relationship between temperature and gas volume. Avogadro's Law derives from the direct relationship between volume and the number of moles in a gas.
Boyle's law is a gas law stating that the pressure and volume of a gas are inversely proportional. When the temperature remains constant, volume increases while pressure decreases and vice versa.
Thus, option A and D are correct.
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2. The energy of an electron in the first orbit in hydrogen atom is-313.6/m² kcal mol. What will be the energy of the electron in 3rd orbit?
The energy of an electron in the third orbit in a hydrogen atom is -3.4 eV.
Answer:
34.8/m² kcal mol
Explanation:
The energy of an electron in an orbit in a hydrogen atom is proportional to the reciprocal of the square of its orbital number. Therefore, the energy of an electron in the 3rd orbit can be calculated as follows:
Energy (3rd orbit) = Energy (1st orbit) * (1/3)^2
Energy (3rd orbit) = 313.6/m² kcal mol * (1/9)
Energy (3rd orbit) = 34.8/m² kcal mol
So the energy of an electron in the 3rd orbit of a hydrogen atom is 34.8/m² kcal mol.
ALLEN
A student runs an experiment to figure out if the size of a wire changes how well it conducts electricity. She uses 5 different widths of copper wire and attaches each to a multimeter to measure
the resistance in the wires. The data collected is shown below.
Wire 1-12 Ohms
Wire 2-17 Ohms
Wire 3-9 Ohms
Wire 4-14 Ohms
Wire 5-6 Ohms
What is the independent variable in this experiment?
A. The multimeter.
B. The resistance values.
C. The material of the wires, copper.
D. The widths of the wires.
A student runs an experiment to figure out if the size of a wire changes how well it conducts electricity. The independent variable in this experiment is the multimeter. Therefore, option A is correct.
What is resistance ?The amount by which an object impedes or resists an electric current is referred to as resistance. The flow of electrons is referred to as electric current. Consider an example of a person struggling to move from one shop to another in a crowded market.
Because a thin wire has fewer electrons to carry the current, its resistance is greater than that of a thick wire. The relationship between resistance and the area of a wire's cross-section is inversely proportional.
Thus, The independent variable in this experiment is the multimeter,option A is correct.
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Elag for Rev
Use the drop-down menus to complete the hypothesis of the
first group of researchers.
During a drought, the decrease in rainfall will reduce the
amount of vegetation that can grow and increase the
occurrence of natural fires, so an elevation in
Select...
and a reduction in Select...
be found in the cores.
▾should
According to the problem should and charcoal particles.
What is the charcoal ?Charcoal is a black, porous, and lightweight material that is produced by burning wood, wood products or other organic materials in the absence of oxygen. It is composed mainly of carbon, but also contains small amounts of hydrogen and other elements. Charcoal is an extremely versatile material that has been used for centuries for a variety of purposes, such as fuel for fires, as an abrasive for polishing and cleaning, and as a pigment for painting. Charcoal is also used in agriculture as a soil enhancer and fertilizer, and in medicine as a detoxifying agent.
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Given 6. 000 moles of aluminum (al ) , how many grams of aluminum oxide (al 2o 3) will be produced?.
[tex]1.223*10^3g[/tex] of aluminum oxide (al 2o 3) will be produced when 6. 000 moles of aluminum (al ) is present.
Aluminum oxide (Al2O3) is formed when Aluminum (Al) reacts with Oxygen (O2). The equation for this reaction is:
2Al + 3O2 → Al2O3
We can thus calculate the amount of Al2O3 produced in this reaction. Since there are 6. 000 moles of Al, we can calculate the number of moles of Al2O3 produced using the equation above.
[tex]2 * 6. 000 moles Al = 12. 000 moles Al2O3[/tex]
We can then convert the moles of Al2O3 to grams using the molar mass of Al2O3, which is 101.96 g/mol.
[tex]12. 000 moles Al2O3 * 101.96 g/mol = 1.223 * 10^{3} g Al2O3[/tex]
Therefore, [tex]1.223*10^3g[/tex] of aluminum oxide (al 2o 3) will be produced when 6. 000 moles of aluminum (al ) is present.
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Metallic magnesium reacts with steam to produce magnesium hydroxide and hydrogen gas.
Mg (s) + 2 H2O (g) → Mg(OH)2 (aq) + H2 (g)
If 16.2 g Mg are heated with 12.0 g H2O, what is the limiting reactant?
How many moles of the excess reactant is left?
How many grams of each product are formed? (you need to give 2 answers)
As determined by the stoichiometry, water is the limiting reactant, and 4.2 moles of the excess reactant are still present after the formation of 39.35 g of magnesium hydroxide and 1.35 g of water.
What does stoichiometry mean?In a chemical process, it is the estimation of the ratios of the constituent elements or molecules. The underlying laws of the associated relationships are the law of conservation of mass and the law of combining weights and volumes.To determine the amounts of different compounds contained in the sample, stoichiometry is employed in quantitative analysis.Water is a limiting reactant since it is present in such small amounts, and according to the chemical equation, there are 16.2 12 = 4.2 moles of excess reactant.16.2 g will result in 16.258.31/24=39.35 g and 24 g of magnesium hydroxide since 24 g of magnesium yields 58.31 g of magnesium hydroxide.Since magnesium yields 2 g of hydrogen, 16.2 g will result in 16.22/24=1.35 g.For more information on limiting agent kindly visit to
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Assume that the average turkey egg contains 10% greater mass percent of York .How many grams of yolk are contained in a turkey egg that weighs 84.37g
The average turkey egg contains 10% more yolk than other types of eggs. Therefore, the amount of yolk in a turkey egg that weighs 84.3 grams can be calculated by multiplying the egg weight by 0.1 (10%).
What is the calculated ?Calculations are a process of solving problems by using mathematical or logical operations and formulas. Calculations are used in many areas of life and in many different fields of study. In mathematics, calculations are used to solve equations, find the value of an unknown variable, and to help analyze data. Calculations are also important in science, engineering, economics, business, and other disciplines. By using calculations, we can determine relationships between variables and use those relationships to make predictions and decisions.
The amount of yolk in this egg is 8.43 grams (84.3 x 0.1 = 8.43).
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Select the correct answer from
each drop-down menu.
What causes O atoms to form covalent bonds?
In a covalent bond, two atoms are held together by the attraction between
bonds that an atom can form depends on the number of
The number of covalent
in the atom.
The oxygen atoms form covalent bonds as they have same value of electronegativity.
What is covalent bond?
Covalent bond is defined as a type of bond which is formed by the mutual sharing of electrons to form electron pairs between the two atoms.These electron pairs are called as bonding pairs or shared pair of electrons.
Due to the sharing of valence electrons , the atoms are able to achieve a stable electronic configuration . Covalent bonding involves many types of interactions like σ bonding,π bonding ,metal-to-metal bonding ,etc.
Sigma bonds are the strongest covalent bonds while the pi bonds are weaker covalent bonds .Covalent bonds are affected by electronegativities of the atoms present in the molecules.
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What is the metabolism during high intensity interval training? Describe the most important processes and name the regulatory enzyme. Describe the regulation of metabolism during exercise. What modification of enzyme activity is involved in this case - covalent or allosteric? Which metabolic products affect fatigue and how? Why are we tired in the sarcoplasmic reticulum after exercise?
During high-intensity interval training, the body's metabolism shifts to meet the increased energy demands of the workout. The most important metabolic processes during high-intensity interval training include:
1. Glycolysis: The breakdown of glucose to produce energy in the form of ATP (adenosine triphosphate).
2. Lipolysis: The breakdown of fats to release fatty acids into the bloodstream, which can then be used as fuel.
3. Oxidative phosphorylation: The production of ATP through the process of cellular respiration, in which glucose and fatty acids are oxidized to produce energy.
The regulatory enzyme involved in these metabolic processes is AMPK (AMP-activated protein kinase), which increases in activity during exercise to stimulate the breakdown of glucose and fatty acids and the production of ATP.
The regulation of metabolism during exercise involves changes in enzyme activity, which can be either covalent or allosteric. In the case of high-intensity interval training, enzyme activity is increased through allosteric regulation, which involves the binding of regulatory molecules to the enzyme to alter its activity.
Metabolic products such as lactic acid and hydrogen ions can affect fatigue during high-intensity interval training. Lactic acid buildup in the muscles can cause fatigue and muscle pain, while the accumulation of hydrogen ions can disrupt muscle function and lead to fatigue.
We are tired in the sarcoplasmic reticulum after exercise because it has been depleted of its energy stores (ATP and glycogen) during the workout. Additionally, the increased levels of metabolic by-products such as lactic acid and hydrogen ions can cause fatigue and disrupt muscle function. The sarcoplasmic reticulum is responsible for storing and releasing calcium ions, which are necessary for muscle contraction. When it is depleted of energy, it can no longer perform this function effectively, leading to fatigue.
Answer:
During high-intensity interval training (HIIT), the body undergoes a number of metabolic processes to provide energy for the muscles. The most important processes are anaerobic glycolysis, which involves the breakdown of glucose to produce energy, and aerobic respiration, which involves the breakdown of glucose and fatty acids in the presence of oxygen.
The regulatory enzyme involved in metabolism during exercise is AMP-activated protein kinase (AMPK). AMPK helps to regulate energy balance in the cells by increasing glucose uptake and fatty acid oxidation, while decreasing glucose production and lipid synthesis.
Metabolism during exercise is regulated through a combination of covalent and allosteric modifications of enzyme activity. Covalent modifications involve the phosphorylation of enzymes, which changes their activity. Allosteric modifications involve the binding of regulatory molecules to enzymes, which changes their conformation and activity.
During exercise, a number of metabolic products can affect fatigue, including lactic acid and hydrogen ions, which can disrupt the acid-base balance in the muscles and lead to fatigue. Another important factor is the depletion of glycogen stores, which can lead to a reduction in energy production.
In the sarcoplasmic reticulum, the accumulation of calcium ions can lead to fatigue after exercise. This is because the increased levels of calcium ions can disrupt the normal functioning of the sarcoplasmic reticulum, which is responsible for regulating muscle contractions. The accumulation of calcium ions can also lead to the activation of proteolytic enzymes, which can break down proteins and contribute to muscle fatigue.
Explanation:
Which term is used to describe the energy needed for a chemical reaction to begin? (1 point)
bond energy
activation energy
kinetic energy
potential energy
Activation energy is used to describe the energy needed for a chemical reaction to begin.
Define chemical reactions .
Breaking chemical bonds between reactant molecules (particles) and creating new bonds between atoms in product particles are two aspects of chemical reactions (molecules). While there are the same number of atoms both before and after the chemical transition, there will be a change in the number of molecules.
The least amount of energy necessary to start a process, such a chemical reaction, is known as the activation energy. Exothermic reactions require activation energy to begin, just like all other chemical reactions. Reactants require activation energy in order to move collectively, overcome repulsive forces, and begin bond breakdown.
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Given the following compounds, predict what the reaction products would be?
Ie: potassium sulfate and barium nitrate
K2SO4 + Ba(NO3)2 KNO3 + BaSO4 (not balanced) BaSO4 is a precipitate
Lithium chloride and silver hydroxide
Sodium iodide and silver nitrate
Calcium hydroxide and potassium carbonate
In the example process, potassium hydroxide and sulfuric acid combine to form potassium sulphate, a salt, and water. The reaction therefore reaction. An acid-base reaction occurs with potassium hydroxide.
How does K2SO4 Ga NO3 2 2kno3 Barium sulfate react?BaSO4(s) + 2 KNO3 = K2SO4(aq) + Ba(NO3)2(aq) (aq) This equation depicts a metathesis process, also known as the double displacing (replacement) reaction, where the reactant ions swap positions to create new products.
Does a precipitate between Ba Nh4-n 2 and K2SO4 form?Potassium sulphate (K2SO4) and barium nitrate (Ba(NO3)2) combine to form barium sulphate (Simple object access protocol) and potassium (KNO3). This double displacement reaction results in the formation of a precipitate.
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if 12.0 grams of potassium chlorate decompose how many grams of potassium chloride will be produced?
If 12.0 grams of potassium chlorate decompose, 7.29 grams of potassium chloride will be produced.
What is molar mass ?The term molar mass of a substance is defined as the mass in grams of one mole of the compound. In a substance, the amount of entities present e.g., atoms, molecules, ions, is defined as a mole. A mole of any substance is 6.022×10²³ molecules.
First change 12.0 grams of potassium chlorate to moles.
calculate the gram molecular mass of potassium chlorate.
Chlorine has seven valance electrons when it is saturated six of these electrons are used by oxygen ( 2 electrons per oxygen) leaving only 1 electron.
1 K x 39 grams/mole
+1 Cl x 35.4 grams/ mole
+3 O x 16 grams/ mole
= 122.4 grams / mole Potassium Chlorate
= 12/122.4
= 0.09 moles.
0.09moles of Potassium Chlorate.
There is a 1:1 mole ratio. 1 mole of Potassium Chlorate will produce 1 mole of Potassium Chloride.
0.09 moles of Potassium Chlorate will produce 0.09moles of Potassium Chloride.
Find the gram molecular mass of Potassium Chloride.
1 K x 39 = 39
+1 Cl x 35.4 = 35.4
= 74.4 grams / mole.
0.09 moles x 74.4 grams/ mole
= 7.29 grams
Thus, if 12.0 grams of potassium chlorate decompose, 7.29 grams of potassium chloride will be produced.
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Sodium chlorate decomposes into sodium chloride and oxygen gas as seen in the equation below.
2NaClO3 --> 2NaCl +3O2
How many moles of O2 were produced by 4 moles of NaClO3? Round your answer to the nearest whole number.
Answer:
16 moles
Explanation:
Since we have the ratios of the substances' molar masses, we can just calculate using those. We know that our end product has 3 grams of oxygen; our equation shows that the end product has 3O2 after decomposition, so we can compare how much oxygen we have to how much 3O2 would weigh if we had whole moles of substance.
3O2 would be six moles and weigh 96 grams. Since we only actually have 3 grams, we know that we are working with 3 / 96 = 1/32 of a mole per substance. Now, we look at the equation again, and multiply the ratio of each substance by 1/32, and then by the molar weight. All that's left is finding the importance of the Sodium and the Chlorine, both of which are prevalent in a ratio of 2, so we take 2/32=1/16 of each substance and multiply by their molar weights; 23/16 grams of Sodium, and 35.5/16 grams of Chlorine. Adding those together, we have 58.5/16 grams, which we can round to 64/16, or 4. Adding those 4 grams to the 3 grams of oxygen that the problem gives us, we have seven grams of Sodium Chlorate necessary to give us 3 grams of oxygen post-decomposition.
Answer:
Explanation:
From the given equation, for every 2 moles of NaClO3, 3 moles of O2 are produced.
So, for 4 moles of NaClO3:
4 moles NaClO3 / 2 moles NaClO3 = 2
Therefore, 2 * 3 moles O2 = 6 moles O2.
So, 4 moles of NaClO3 will produce 6 moles of O2.
helpppppppp!!!!!!!!!!
Answer:
no answer
Explanation:
I wish I could help you
Which energy output object(s) work with the solar panel?
A. fluorescent light bulb
B. fan
C. water heater
D. incandescent light bulb
Fan and water heater are the energy output object(s) work with the solar panel. Therefore, option B and C are correct.
What is solar panel ?Solar panels are devices that capture the sun's rays and convert them into electricity or heat. A solar panel is a collection of solar (or photovoltaic) cells that can be used to generate electricity via the photovoltaic effect.
Once you've determined the voltage and amperage, all you have to do is multiply them. The wattage of your solar panel output should be similar to the solar panel rating as a result.
Thus, option B and C are correct.
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what is the balanced equation for
αHC2H3O2(aq)+βBa(OH)2(aq) →γH2O(l)+δBa(C2H3O2)2(aq)
Answer:
α HC2H3O2 (aq) + β Ba(OH)2 (aq) → γ H2O (l) + δ Ba(C2H3O2)2 (aq)
Explanation:
To balance the equation, you need to make sure that the number of atoms of each element on both sides of the equation are equal. The balanced equation for the reaction between α moles of acetic acid (HC2H3O2) and β moles of barium hydroxide (Ba(OH)2) to produce γ moles of water (H2O) and δ moles of barium acetate (Ba(C2H3O2)2) is:
α HC2H3O2 (aq) + β Ba(OH)2 (aq) → γ H2O (l) + δ Ba(C2H3O2)2 (aq)
The base SI unit for molar mass is kgmol.
A. TRUE
B. FALSE
Calculate the number of calories of energy absorbed by the water Q
79942.6 calorie is the number of calories of energy absorbed by the water. The energy of an isolated system holds that energy could be transformed.
What is energy?In physics, energy is indeed the quantitative quality that is imparted to a body or a physical system and is visible in the form of light and heat.
The energy of an isolated system holds that energy could be transformed in form but cannot be generated or destroyed. The joule is the International System of Units (SI) unit of measurement for energy (J).
Q = 2 kg × 4181 J / kg °C × 40°C
= 334,480 J
=79942.6 calorie
Therefore, 79942.6 calorie is the number of calories of energy absorbed by the water.
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please name these compounds
1) 1-Phenyl propan -1-ol
2) 3-methyl butanal
3) 2-Cyano ethene
4) 4 - bromo-2-methyl pent -3- one
5) 3,5 -dihydroxy -3-enoic acid
What is the IUPAC names of the compounds?The IUPAC nomenclature has to do with the manner that we use in chemistry to be able to name compounds. These are the rules for the naming of compounds that have been put together by the International Union of Pure and applied chemistry.
In these rules, we would have to find out the root of the compound name by counting up the number of the chains that we have and then noting the substituents that we have on the chains.
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A student combined two solutions of clear liquids in a test tube, after one minute a solid substance appeared in the test tube. Based on their observations, can the students correctly conclude that a chemical reaction occurred?
5.
Why do you think hydrogen (element 1) is on both sides of the periodic table? (2 marks)
Name a metal that is in the liquid state at room temperature. (1 mark)
8. Explain the difference between an atom and an ion. (2 marks)
9.
6789
6.
Will astatine (element 85) look more like
marks)
7.
Use your periodic table, pick out which atom with the highest ionization energy in these lists: (1
mark each = 4 marks)
a) Na, Sr, Be, Rb
b) B. Al, C, Si
c)
Fr, Fe, Zn, Cl
d) Cu, Ag, Au, B
10. Why is second ionization energy of atom always larger than its first ionization energy? (1 mark)
11. Which of the atoms in each of the following groups has the largest atomic radius? (1 mark each
= 3 marks)
a) Cl, Si, K
b) Cs, Ca, Be
c) N, Al, Cl
12. Arrange these groups of atoms in order of increasing atomic radius: (1 mark each = 3 marks)
a) Xe, Ar, Kr
b) K, Br, Ca
c) B, C, N
13. Explain two reasons why atomic radii increase from top to the bottom. (2 marks)
14. Explain a reason why atomic radii decrease from the left to right. (1 mark)
15. Which atom in each of the following pairs has the highest electronegativity? (1 mark each
= 3 marks)
a) Zn or Ge
b) O or Te
c) Ba or Hg
16. Which atom in each of the pairs that follow has the higher electron affinity and therefore gives off
the most energy when it forms a negative ion? (1 mark each = 3 marks)
c) Si, Ga
a) Cl, Br
b) Se, Br
Answer:
I'll only answer the first 2 questions because there are too many questions.
1) Hydrogen basically does not really belong to Group 1 or 17 of the periodic table. To be exact, there is to such an extent that some might put it under no groups at all. Hydrogen has 1 electron in its valence shell, similar to elements in group 1. Still, it also has to gain 1 more electron to attain noble gas configuration (2 electrons for 1st shell, 8 electrons for 2nd shell). Hence, no one actually knows what hydrogen should be classified in, hence classifying it into either Group 1, 17 neither or both.
2) Mercury is the only metal that will be in liquid state at room temperature at 1 atm.
Use a primary standard to determine an unknown concentration using an acid–base titration.
Potassium hydrogen phthalate is a solid, monoprotic acid frequently used in the laboratory as a primary standard. It has the unwieldy formula of KHC8H4O4. This is often written in shorthand notation as KHP.
If 38.39 mL of a sodium hydroxide solution are needed to neutralize 2.677 grams of KHP, what is the concentration (mol/L) of the sodium hydroxide solution?
? M
The concentration of the sodium hydroxide solution is 0.341 mol/L (or M).
How to calculate the concentration of sodium hydroxide?
We can use the balanced chemical equation for the reaction of sodium hydroxide (NaOH) with potassium hydrogen phthalate (KHP) to determine the number of moles of NaOH that were used in the titration:
NaOH + KHP → NaKP + H2O
From the balanced equation, we see that one mole of NaOH reacts with one mole of KHP. Therefore, the number of moles of NaOH used in the titration is equal to the number of moles of KHP:
moles of KHP = mass of KHP / molar mass of KHP
The molar mass of KHP can be calculated using the atomic weights of the elements in the formula:
molar mass of KHP = (1 x 39.10 g/mol) + (8 x 12.01 g/mol) + (4 x 16.00 g/mol)
molar mass of KHP = 204.22 g/mol
Substituting the values given in the problem, we have:
moles of KHP = 2.677 g / 204.22 g/mol
moles of KHP = 0.0131 mol
Since one mole of NaOH reacts with one mole of KHP, the number of moles of NaOH used in the titration is also 0.0131 mol.
The concentration of the NaOH solution can be calculated using the formula:
concentration of NaOH = moles of NaOH / volume of NaOH solution
Substituting the volume of the NaOH solution given in the problem, we have:
concentration of NaOH = 0.0131 mol / 0.03839 L
concentration of NaOH = 0.341 M
Therefore, the concentration of the sodium hydroxide solution is 0.341 mol/L (or M).
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Imagine the following reaction of acetic acid with water is at equilibrium at 25 °C.
In A option1 is correct
What is Acid ?
In chemistry, an "acid" is a substance that donates hydrogen ions (H+) to another substance, or accepts electrons from another substance. Acids are typically characterized by a sour taste, the ability to dissolve some metals, and a pH value of less than 7 in aqueous solutions. They are often used as reagents in chemical reactions, and are important in many biological processes. Common examples of acids include hydrochloric acid (HCl), sulfuric acid (H2SO4), and acetic acid (CH3COOH). Acids can be classified as either strong or weak, depending on the extent to which they dissociate in water, and can react with bases to form salts and water in a process called neutralization.
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What is the solubility of PbF₂ in a solution that contains 0.0500 M Pb²⁺ ions?
The solubility product constant (Ksp) of PbF2 may be used to calculate the solubility of PbF2 in a solution containing 0.0500 M Pb2+ ions. PbF2 has a Ksp of 8.3 x 10-8.
What is the way for calculating the concentration ?Accordingly, the concentration of Pb2+ ions multiplied by the concentration of F ions at equilibrium must equal 8.3 x 10-8. By dividing the Ksp by the known concentration of Pb2+ ions (0.0500 M), which is known, the concentration of F ions may be calculated.
As a result, there will be 1.66 x 10-6 M or 8.3 x 10-8/0.0500 M of F ions in the solution. This indicates that 1.66 x 10-6 M of PbF2 is soluble in the solution.
It is essential to remember that the The answer is 1.66 x 10-6 M. Due to the low concentration of F ions in this solution, it is significant to notice that PbF2 is not highly soluble in it. This is due to the fact that the relationship between the concentration of Pb2+ ions and the solubility of PbF2 is inverse.
The solubility of PbF2 reduces as Pb2+ ion concentration rises. PbF2 is therefore only barely soluble in this solution.
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