Answer:
Explanation:
Sodium:
A soft, silver-white, metallic element that oxidizes rapidly in moist air, occurring in nature only in the combined state, and used in the synthesis of sodium peroxide, sodium cyanide, and tetraethyllead: a necessary element in the body for maintenance of normal fluid balance and other physiological functions. Symbol: Na; atomic weight: 9898; atomic number: 11; specific gravity: 0.97 at 20°C.
Chloride:
A salt of hydrochloric acid consisting of two elements, one of which is chlorine, as sodium chloride, NaCl
Sodium chloride:
Salt, a crystalline compound, sodium chloride, NaCl, occurring as a mineral, a constituent of seawater, etc., and used for seasoning food, as a preservative, etc.
Now we must discuss the differences.
The sodium ion and chlorine anion combine to generate sodium chloride, an ionic molecule. The chlorine atom obtains an electron to form the chlorine ion, while the sodium ion is created from the sodium metal by removing one valence electron from its outermost electronic state.
The compounds that are created by a cation and an anion and have an ionic connection between the two ions are referred to as ionic compounds. The definition of an ionic bond is a bond created by an electron transfer between two atoms.
The characteristics of the individual atoms or the ions are different from those of the ionic complex. The chlorine atom is a yellow-green gas that corrodes the metal and is dangerous, whereas the sodium atom is a silvery white that aggressively burns in the air and becomes explosive when it comes into touch with water. The ionic compound sodium chloride has a white crystalline form and is frequently used as table salt in daily life for ingestion and other activities.
Properties:
Sodium chloride
Ionic compoundTable salt and is consumedBoiling point is 1465 degree CelsiusMelting point is high 800.7 degree CelsiusSodium
Metal elementExplosive when reacted with waterSoft and harmfulBoiling point is 882.940 degree CelsiusMelting point is 97.794 degree CelsiusChloride:
Non-metalSoluble in waterPoisonousBoiling point is -34.04 degree Celsius.Melting point is -101.5 degree CelsiusThis is how the sodium chloride varies from sodium and chlorine atoms in terms of properties.
Note: As sodium is a very soft metal, it is maintained and stored in mineral oil to stop it from interacting with the air and water. Metal sodium should be treated cautiously while being used.
- Eddie
One mole of a substance contains (Avogadro number) molecules. Calculate the number of atoms in 0.750 moles of, as follows:
One mole of the substance contains the (Avogadro number) molecules. The number of the atoms in 0.750 moles is 4.5 × 10²³ atoms.
The number of the molecules in 1 moles is as follows :
1 mole = 6.02 × 10²³ atoms or molecules
This number is called as the Avogadro number. Therefore, in 1 mole of the substance there will be 6.02 × 10²³ atoms or the molecules.
The number of the moles = 0.750 mol
The number of atoms in 0.750 mol is as :
The number of atoms = 0.750 × 6.02 × 10²³ atoms
The number of atoms = 4.5 × 10²³ atoms.
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You have an order to administer 40 mg of methadone (Dolophine) SC for opioid detoxification. You have on hand 30 mg/mL. How much should you draw into the syringe?
An order to administer the 40 mg of the methadone for the opioid detoxification. we have on hand 30 mg/ mL. The amount should we draw into the syringe is 1.3 mL.
The order to administer the methadone = 40 mg
The on hand dose = 30 mg / mL
The amount should we draw into the syringe is :
The Required dose = (desired/amount on hand) x volume
The Required dose = ( 40 mg / 30 mg ) × 1 mL
The required dose = 1.3 mL
Thus, The amount should draw into the syringe is 1.3 mL.
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Given that Ka for HF is 6.3 × 10-4 at 25 °C, what is the value of Kb for F– at 25 °C?Given that Kb for CH3NH2 is 5.0 × 10-4 at 25 °C, what is the value of Ka for CH3NH3 at 25 °C?
The Ka for HF is 6.3 × 10⁻⁴ at 25 °C, The value of Kb for the F⁻ at 25 °C is 1.58 × 10⁻¹¹ . The Kb for the CH₃NH₂ is 5.0 × 10⁻⁴ at 25 °C, The value of the Ka for is 2 × 10⁻¹¹ .
The value of Ka for HF = 6.3 × 10⁻⁴
The relation of the Ka and Kb is as follows :
Ka × Kb = Kw
Kb = Kw / Ka
Where , the Kw = 1 × 10⁻¹⁴
Kb = 1 × 10⁻¹⁴ / 6.3 × 10⁻⁴
Kb = 1.58 × 10⁻¹¹
The value of Ka for CH₃NH₂ = 5.0 × 10⁻⁴
Ka × Kb = Kw
Ka = Kw / Kb
Ka = 1 × 10⁻¹⁴ / 5.0 × 10⁻⁴
Ka = 2 × 10⁻¹¹
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how much atp is produced from b oxidation of 3 moles of fatty acid
It is possible to produce a minimum of 9 ATP molecules 3 to maximum of 18 ATP molecules per cycle of beta-oxidation .The amount of ATP produced from the beta-oxidation of 3 moles of fatty acids depends on the length and composition of the fatty acids.
Fatty acids are broken down into two-carbon units in a process called beta-oxidation, which takes place in the mitochondria. Each cycle of beta-oxidation produces 1 molecule of acetyl-CoA, 1 molecule of NADH, and 1 molecule of FADH2. The energy produced from beta-oxidation is then used to generate ATP in the process of cellular respiration. During cellular respiration, NADH and FADH2 are used to generate ATP in the electron transport chain. One NADH molecule can produce around 3 ATP molecules, while one FADH2 molecule can produce around 2 ATP molecules. So, the exact amount of ATP produced from beta-oxidation of 3 moles of fatty acids depends on the specific fatty acids being broken down and the efficiency of the energy-producing processes within the cell. However, as a rough estimate, it is possible to produce a minimum of 9 ATP molecules (3 ATP per NADH * 3 NADH) to a maximum of 18 ATP molecules (3 ATP per NADH * 3 NADH + 2 ATP per FADH2 * 2 FADH2) per cycle of beta-oxidation.
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PLEASE ANSWER NOW THANK YOU
The products of this chemical reaction from plant cells are sugar and oxygen (C₆H₁₂O₆ + 6O₂).
What are plant cell reactions?Plant cell reactions refer to the metabolic processes that occur within the cells of plants. These reactions are crucial for the survival and growth of the plant.
Some of them are photosynthesis, the process by which plants convert light energy into chemical energy stored in glucose (sugar). Respiration, the process by which plants release energy stored in glucose and convert it into energy usable by the cell.
Cellular respiration, the process by which cells use oxygen to produce energy from glucose. Transpiration, the process by which water is taken up by roots and then lost from the leaves through tiny pores called stomata.
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How does the addition of heat to a substance at its melting point affect its average kinetic energy?
acetate can form several resonance structures. what is the difference between two resonance structures?
The difference between two resonance structures of an acetate molecule is the arrangement of electrons in the bonds between atoms.
In resonance structures, the positions of electrons are interchangeable, and each structure represents a valid distribution of electrons in a molecule. The difference between two resonance structures lies in the arrangement of electrons in the bonds between atoms. However, the actual distribution of electrons in the molecule is a hybrid of all possible resonance structures. This hybrid is known as the resonance hybrid, which is a weighted average of all the resonance structures, where the weight of each structure depends on its stability. The stability of a structure depends on the distribution of electrons in the bonds and the resulting formal charge on each atom. The resonance hybrid is a more accurate representation of the actual distribution of electrons in a molecule, as it accounts for the fact that electrons are not confined to a single, fixed position.
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It’s says you have to prepare 250 mL of a solution A (H2SO4) that has a molal concentration of 0,2 m and this from an initial concentrated solution :
Concentration of the concentrated solution of H2SO4: 62% m/m (g/g)
Voluminous masse of H2SO4 concentrated: 1,52g/mL
Calculate the volume of the solution concentrated ( H2SO4) that is necessary
It’s a chemistry problem
Volume of concentrated solution = 250 mL * 0.2 molal/ (1.52 g/mL * 0.62 molal)= 33.76 mL
Dilution calculationThis is an example of a dilution calculation. To calculate the volume of the concentrated solution necessary to prepare 250 mL of a 0.2 m solution of H2SO4, we must use the formula: V1C1 = V2C2, where V1 is the volume of the concentrated solution, C1 is the concentration of the concentrated solution, V2 is the desired volume of the diluted solution, and C2 is the concentration of the diluted solution.In this case, V1 = ?, C1 = 62% m/m (g/g), V2 = 250 mL, and C2 = 0.2 m. Rearranging the equation, we get V1 = V2C2/C1, or V1 = 250 mL x 0.2 m / 62% m/m (g/g).Since 1 mL of the concentrated solution has a mass of 1.52 g, the volume of the concentrated solution necessary is V1 = (250 mL x 0.2 m) / (62% m/m x 1.52 g/mL) = 7.18 mL.Therefore, 7.18 mL of the concentrated solution is necessary to prepare 250 mL of a 0.2 m solution of H2SO4.To learn more about dilution calculation refer to:
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koh hno3 → kno3 h2o 13.5 g koh and 12.0 g hno3 react. the limiting reactant is:
In this reaction, KOH is the limiting reactant. The amount of KNO3 and H2O produced will be determined by how much KOH is present.
This is because there is 13.5 g of KOH and 12.0 g of HNO3, so there is not enough HNO3 to react with all of the KOH. as the reaction cannot proceed if there is not enough HNO3 to react with all of the KOH. The reaction is an acid-base reaction, where KOH acts as the base and HNO3 acts as the acid. So KOH is the limiting reactant in the equation KOH + HNO3 → KNO3 + H2O.
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how much heat is required to melt 12.6 g of 24-carat gold at 298 k? the melting temperature of 24-carat gold is 1063oc. the molar heat capacity of 24-carat gold is 25.6 j/molk and the heat of fusion for 24-carot gold is 12.5 kj/mol.
0.805 kJ of heat is required to melt 12.6 g of 24-carat gold at its melting point of 1063^0C.
The heat required to melt 12.6 g of 24-carat gold can be calculated using the heat of fusion, which is the amount of heat required to convert a solid into a liquid at its melting point.
The heat of fusion for 24-carat gold is given as 12.5 kJ/mol.
We can convert the mass of gold to moles and then use the heat of fusion to calculate the heat required.
First, convert the mass of gold to moles:
12.6 g / (196.97 g/mol) = 0.0644 mol
Next, multiply the number of moles by the heat of fusion to find the heat required:
0.0644 mol * 12.5 kJ/mol = 0.805 kJ
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calculate the osmotic pressure of a solution containing 20.00 mg mg of hemoglobin in 14.8 ml ml of solution at 19 ∘c ∘c . the molar mass of hemoglobin is 6.5×104 g/mol6.5×104 g/mol .
Using the data provided, the osmotic pressure is 49799.5 atm.
The osmotic pressure is the least amount of pressure that must be applied to a solution in order to block the passage of the solution's pure solvent through a semipermeable membrane. It may alternatively be described as a measurement of a solution's propensity to osmotically absorb its pure solvent.
Number of moles = mass/molar mass
= 20.00 × 10^-3/6.5 × 10^4
= 30.76 mol.
volume V = 14.8 x 10^-3 L
R = 0.08205746 L.atm/K.mol
T = 19+ 273K
= 292 K
Using the formula of Ideal gas law PV = nRT
P = (30.76 * 0.08205746 * 292)/0.0148
= 49799.5 atm
The osmotic pressure is 49799.5 atm
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Acetic acid, also known as ethanoic acid, has the chemical formula of CH3COOH. Determine the most mass of the acid.
(a) 60.05g
(b) 24.02g
(c) 40.00g
(d) 52.04g
Acetic acid is composed of CH3COOH. Mass= 6.022× (10 )23 / 60.06 =9.973× (10 )−23 g.
What is the elements of CH3COOH?Acetic acid, also termed ethanoic acid and methane carboxylic acid, is a colorless liquid with a strong, recognizable, pungent, and sour smell. Acetic acid is composed of CH3COOH.
Four hydrogen (H) atoms, two oxygen (O) atoms, and two carbon (C) atoms make up its atomic composition.
It is an organic compound since carbon appears in its chemical composition.
As of writing, 60.06 g/mol is the molar mass of CH 3 COOH.
Finding the mass of one CH 3 COOH molecule is necessary.
This equation can be used:
The quantity of atom = Molar mass / mass Equals * Avogadro number
In the formula, we can change the values shown below:
Atom count is one.
Molar mass = 60.06 g/mol
Avogadro number = 6.022 * (10) 23
The quantity of atoms Molar mass / mass * Avogadro number
∴1= 60.06 / mass ×6.022 × (10 )23
Mass= 6.022× (10 )23 / 60.06 =9.973× (10 )−23 g.
The Complete Question.
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3. what will happen if ammonia is added to a mixture of ag , fe3 and co2 ? describe the subsequent steps that could be performed to separate the three cations.
When ammonia is added to a mixture of Ag+, Fe3+, and CO32-, Ag+ ions will form a soluble complex with ammonia to form [Ag(NH3)2]+ while Fe3+ and CO32- will remain in their original forms.
To separate the three cations, the following steps can be performed:Precipitation of Ag+ as Ag(NH3)2Cl: The mixture is treated with a chloride salt, such as NaCl, to form a precipitate of AgCl, which can be filtered out.Precipitation of Fe3+ as Fe(OH)3: The mixture is treated with an alkali, such as NaOH, to form a precipitate of Fe(OH)3, which can be filtered out.Removal of CO32- by complexation: The mixture can be treated with a complexing agent, such as EDTA, to form a soluble complex with CO32-, which can be removed by filtration or extraction.You can learn more about ammonia at
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which molecule or ion below is amphipathic? which molecule or ion below is amphipathic? h2o ch3ch2ch2ch2ch3 h2nch2cooh (glycine)
The molecule of ion below amphipathic is CH3(CH2)14COO.
Saturated fatty acids include palmitic acid. The substance's chemical name is CH3(CH2)14COO. The primary dietary sources of palmitic acid are meat, cheese, and dairy products.
A molecule that is both hydrophobic nonpolar and hydrophilic polar is said to be amphiphilic or amphipathic. Sodium dodecylbenzene sulfonate, pictured below, is an example of a soap or detergent that has both a hydrophobic zone shown in red and a hydrophilic region for cleaning purposes shown in blue.
A chemical molecule known as an amphipath, or amphiphile from the Greek words memphis, both, and philia, love, friendship, possesses both hydrophilic polar, attracted to water and lipophilic attracted to fat qualities. It is known as amphiphilic or amphipathic chemical.
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What is the number of grams present in 4 moles of H2O?
The number of grams present in 4 moles of H2O is found to be 72g.
How do you compute gram per mole?The substance you have will influence how many grams are in a mole. Determine it by multiplying the substance's atomic or molecular mass by the number of moles you contain. Atomic or molecular mass will be equal to the weight for one mole.
Mass of 1 mole of water => 18g
Hence, mass of 4 moles of water => 4 x 18 = 72 g
How are moles calculated?The Avogadro's constant, or 022 x 10 23 particles, is the amount that equates to 1 mole. Simply divide the specified weight of the substance by its molar mass to figure out the number of moles of any substance in the sample.
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How many cAMP molecules are necessary to activate protein kinase A?
4
One cAMP molecule is necessary to activate protein kinase A.
cAMP, or cyclic adenosine monophosphate, is a signaling molecule that is involved in many cellular processes, including the regulation of gene expression, metabolism, and muscle contraction. Protein kinase A, or PKA, is an enzyme that is activated by cAMP.
When cAMP levels increase within a cell, it binds to and activates PKA, which then carries out its enzymatic function. PKA acts as a kinase, meaning that it transfers a phosphate group from ATP to target proteins, which changes their activity and function.
The activation of PKA by cAMP is a highly specific process, and it has been found that only one cAMP molecule is necessary to activate PKA. This allows for precise regulation of PKA activity in response to changes in cAMP levels.
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weil felix reaction is what type of agglutination reaction:
The Weil-Felix reaction is a type of agglutination reaction. Agglutination reactions are diagnostic tests that involve the clumping or "agglutination" of particles, such as red blood cells or bacteria, in response to the presence of specific antigens.
In the Weil-Felix reaction, a suspension of live or killed bacteria is mixed with specific antisera (antibodies) in order to determine the presence of certain bacterial infections, such as typhus or Rocky Mountain spotted fever. If the bacteria contain the specific antigen, they will agglutinate in response to the antiserum, producing a visible clumping reaction.
The Weil-Felix reaction is an indirect test that is based on the principle of immunological cross-reactivity, where antisera produced in response to one infection will react with other related bacteria. However, it should be noted that the Weil-Felix reaction has limitations and may not be as reliable as other diagnostic tests, such as polymerase chain reaction (PCR) or bacterial culture, for identifying specific bacterial infections.
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The breakthrough Dmitri Mendeleev had when constructing the periodic table occurred _______
When Mendeleev placed the elements in a sequence of increasing atomic mass
The breakthrough Dmitri Mendeleev had when constructing the periodic table occurred when Mendeleev placed the elements in a sequence of increasing atomic mass.
The breakthrough Dmitri Mendeleev had when constructing the periodic table occurred when he realized that the properties of elements were repeating in a pattern based on their atomic structure, and not just their atomic mass.
Dmitri Mendeleev was a Russian chemist who is known for creating the first periodic table of elements. He initially arranged the elements in a sequence of increasing atomic mass, but he soon realized that this arrangement did not accurately reflect the properties of the elements. Instead, he found that the properties of the elements were repeating in a pattern based on their atomic structure, specifically the number of protons in the atomic nucleus.
Based on this realization, Mendeleev arranged the elements in a table according to their atomic structure and properties, creating the first periodic table. This table showed a repeating pattern of properties for elements in the same vertical column (group), and he was able to predict the properties of elements that had not yet been discovered based on this pattern.
Mendeleev's breakthrough was significant because it provided a new way of understanding the relationships between the elements, which laid the foundation for modern chemistry and helped to explain many chemical reactions and processes.
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how many moles of water are produced when 3 moles of hydrogen gas reacts with 2 moles of oxygen gas?
Explanation:
When 3 moles of hydrogen gas react with 2 moles of oxygen gas, they will produce 2 moles of water (H2O). The balanced chemical equation for this reaction is:
2H2 + O2 -> 2H2O
It can be seen that 2 moles of hydrogen react with 1 mole of oxygen to form 2 moles of water. Therefore, when 3 moles of hydrogen gas react with 2 moles of oxygen gas, they will produce 2 moles of water.
acetone is a common solvent that has a density of 0.7899 g/ml. 0.7899 g / ml . what volume of acetone, in milliliters, has a mass of 31.0 g 31.0 g ?
By using the definition of density, the volume of acetone is 39.24547 ml.
As per the given data, Acetone is a common solvent that has a density of 0.7899 g/ml.
Also, the mass is given by 31.0 g
Density is a quantity that allows us to measure the amount of mass in a certain volume of a substance.
The expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:
Density = Mass ÷ volume
It can be deduced that density is inversely proportional to volume: the smaller the volume occupied by a given mass, the higher the density.
Volume of acetone
In this case, you know that:
Density = 0.7899 g/mL
Mass = 31.0 g
Replacing in the definition of density:
0.7899 g/ml= 31.0 g ÷ Volume
Solving:
Volume = 31.0 g ÷ 0.7899 g/ml
Volume = 39.2454741106 ml
Therefore, the volume of Acetone is 39.2454741106 ml.
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What volume (in liters) of a 133 ppm NH3 solution with a density of 0.998 g/mL is required to provide 0.0175 grams of NH3? (Molecular Weights NH3 = 17.03 g/mol, H2O = 18.02 g/mol)
0.0758 L is the volume of a 133 ppm NH3 solution with a density of 0.988 g/ml is required to provide 0.0175 grams of NH3.
To find the volume of a 133 ppm NH3 solution required to provide 0.0175 grams of NH3, we'll first convert the concentration of the solution from parts per million (ppm) to grams per liter (g/L).
= (ppm) x (density of solution in g/mL) x (molecular weight of solute in g/mol) / (10^6)
= (g/L)
For a 133 ppm NH3 solution at 0.998 g/mL density:-
= (133 ppm) x (0.998 g/mL) x (17.03 g/mol) / (10^6)
= 0.2309 g/L
Next, we'll use the mass of NH3 (0.0175 g) and the concentration of the solution (0.2309 g/L) to find the volume of the solution required:
= (mass of NH3 in g) / (concentration of solution in g/L)
= (volume of solution in L)
= (0.0175 g) / (0.2309 g/L)
= 0.0758 L
So, 0.0758 liters of the 133 ppm NH3 solution with a density of 0.998 g/mL is required to provide 0.0175 grams of NH3.
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10 which substance contains only ionic bonds? a nano3 b h3po4 c nh4cl d cacl2
CaCl2 contains only ionic bonds.(Option d)
Ionic bonds are a type of chemical bond formed between two ions, usually between a metal and a non-metal. The bond is formed when the metal donates one or more electrons to the non-metal, creating a positively charged ion (cation) and a negatively charged ion (anion). The ions are attracted to each other by electrostatic forces, forming an ionic bond.Ionic bonds are strong and rigid, and result in the formation of ionic compounds that are typically solids with high melting and boiling points. They are typically formed between elements with large differences in electronegativity, such as sodium (Na) and chlorine (Cl).In an ionic compound, the positively charged ions (cations) are arranged in a regular pattern, surrounded by the negatively charged ions (anions).
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what two properties of a bond are illustrated in a graph of potential energy versus bond distance? how are they indicated?
Bond length and bond energy are indicated at the minimum of the potential energy-bond distance graph and are the two properties of a bond that are illustrated in the graph given below.
Look at the graph attached below for better understanding of explanation.
The graph illustrates the relationship between atomic separation and energy in a system of two atoms. At a distance, the energy is 0, indicating "no touch." At distances of several atomic diameters or more, attractive forces are more powerful than repulsive ones, which leads to an increase in energy. At the curve's minimum point, the effects of attraction and repulsiveness are equal. Specific characteristics of chemical bonds can be clarified through stories that portray this relationship. Such as:
Bond length: The distance between the nuclei where the potential energy minimum occurs determines the bond length. The equilibrium bond length is a more appropriate term because it describes how far the two atoms bounce as a result of thermal motion. Typically, a bond's strength increases with its length.
Bond energy: The bond energy is the amount of energy that needs to be added from the bottom of the "potential energy well" to the point of zero energy, which symbolizes the two atoms being infinitely apart or, more concretely, not linked to one another. Since there is no interaction at great distances, the energy is 0 there.
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a W hairpin filament operation temperature is increased from 800 C to 900 C, what is the expected increase in the brightness? [10] If a W hairpin filament operation temperature is increased from 800 C to 1100 C, what is the expected increase in the brightness?
When an image's brightness is increased, all of the colors are illuminated, turning the original light hues up to white.
In the opposite direction, reducing brightness will make all colors darker, bringing the originally tinted ones all the way to black. You may change the LCD brightness of your computer screen by continuously pressing the button. For further details, see Changing the LCD Brightness. Press the Fn+F5 keys to reduce the brightness. Pressing the Fn+F6 keys will boost the brightness. High brightness by itself does not endanger the health of the eyes. The amount of light entering the eye is controlled by the iris and pupil, therefore external brightness considerations rarely create problems. Brighter light sources are not inherently dangerous, but improper lighting might cause visual symptoms.
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4. The role of journalists in the dissemination of scientific information has been:
Onegative and positive.
only positive.
O completely unbiased.
only negative.
Journalists' contributions to the presentation of empirical evidence of research knowledge have been neither negative nor constructive. Journalists play an entirely unbiased role.
What are a journalist's duties and responsibilities?Some journalists assert that their obligations and responsibilities are the same whether they are covering politicians, business, or any other subject. These journalists assert that truthful, understandable information is their primary focus.
What function does a journalist play in the news of health and medicine?According to the statement, broadcasters have a responsible management to cover health-related and medical news. Association members are aware that the data presented in our publications may encourage customers and viewers to make critical medical decisions.
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what were the principal gold and silver boom areas from 1858 to 1874? what other mineral extraction became economically important?
The period from 1858 to 1874 saw the growth of several mineral extraction industries that contributed to the economic development of the United States.
The gold and silver boom areas in the western states were the largest and most prominent, but other minerals, including lead, zinc, copper, coal, petroleum, and iron, also played important roles. From 1858 to 1874, the principal gold and silver boom areas were in the western United States, particularly in California, Nevada, Colorado, and Arizona. The discovery of gold in California in 1848 led to the famous California Gold Rush, attracting thousands of people from all over the world to seek their fortunes in the mines.
Nevada's Comstock Lode, discovered in 1859, was one of the largest and most productive silver mines in American history. The discovery of gold in the Colorado Rockies in 1859 and the discovery of silver in Arizona in the 1870s also contributed to the boom in these states.
In addition to gold and silver, other minerals became economically important during this time period. Lead, zinc, and copper mining boomed in the Southwest, particularly in Arizona and New Mexico. Coal mining became a major industry in Pennsylvania and West Virginia. Petroleum was discovered in Pennsylvania in 1859 and quickly became an important source of fuel for industry and transportation. Iron mining also became important in the Great Lakes region, providing the raw materials for the growing American steel industry.
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which of the following correctly reflect avogadro's number? choose all that apply. multiple select question. the number of entities in a mole is called avogadro's number. the mole is abbreviated mo. the mole contains 6.022 x 1023 entities. for a pure substance, the mole specifies only the number of entities in a sample.
The reflect Avogadro's number are the number of entities in a mole is called Avogadro's number. The mole contains 6.022 x 10^23 entities. For a pure substance, the mole specifies only the number of entities in a sample. Therefore, option A, C and D are correct.
Avogadro's number is the number of entities (atoms, molecules, ions, etc.) in a mole of substance. It is defined as exactly 6.02214076 x 10^23 entities per mole. The mole is the SI unit of amount of substance, similar to how a dozen is a unit of count for eggs.
This concept is important in the field of chemistry because the mole allows for the easy conversion of the mass of a substance to the number of entities it contains, and vice versa. Knowing Avogadro's number is crucial in calculating chemical reactions, stoichiometry and many other areas of chemistry.
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1.
What is speed?
Ohow far you go
Ohow fast you accelerate
how much distance is covered over a period of time
the change in the location of an object
Speed is C. how much distance is covered over a period of time
What is Speed?This refers to the term that is used to describe and define the size of the change in position of that object over time or the size of the change in position per unit of time and this is a scalar quantity.
Hence, it can be seen that from the answer choices given, speed is simply the distance covered at a particular time which is option C.
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if the rate of a reaction increases by a factor of 10 when the temperature is increased by 35 degress celcius from 300k to 335k, what is the activation energy for the reaction?
The activation energy for a reaction that increases by a factor of 10 when the temperature is increased from 300K to 335K is approximately 57.1 kJ/mol.
This can be calculated using the Arrhenius equation, which states that the reaction rate is proportional to the exponential of the activation energy divided by the absolute temperature. The equation used to calculate the activation energy is:
Ea = -RT * ln(k2/k1),Where R is the ideal gas constant, T is the absolute temperature, k1 is the reaction rate at 300K, and k2 is the reaction rate at 335K.
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what does ir spectroscopy measure? how was it used to determine the identity of the unknowns in this experiment?
IR spectroscopy measures the absorption of infrared radiation by a sample to determine its molecular structure. It is used to determine the identity of unknowns by comparing their IR spectra to a reference library of spectra for known compounds.
IR spectroscopy (Infrared spectroscopy) is a technique used to determine the molecular structure of a substance by measuring the absorption or transmission of infrared radiation by a sample. The absorption of infrared radiation by a molecule causes vibrations in its bonds, and the pattern of these vibrations is unique for each type of molecule.
In the context of an experiment, IR spectroscopy was used to determine the identity of unknowns by comparing their IR spectra to a reference library of spectra for known compounds.
The IR spectrum of an unknown sample is obtained and the peaks in the spectrum are compared to those in the reference library. If a match is found, the identity of the unknown can be determined.
This method is based on the principle that different functional groups, such as alcohols, carbonyls, and amines, produce characteristic IR absorptions that can be used to identify the functional groups present in a molecule.
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