Answer:
Bohr's model of hydrogen is based on the nonclassical assumption that electrons travel in specific shells, or orbits, around the nucleus.
Explanation:
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An experiment requires 18.0 g of cyclohexane, which has a density of 0.7781 g/mL at 25°C. What volume of cyclohexane should be used?
Taking into account the definition of density, the volume of cyclohexane should be 23.13 mL.
Definition of densityDensity is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space and allows us to measure the amount of mass in a certain volume of a substance.
The expression for the calculation of density is:
density= mass÷ volume
Volume of cyclohexaneIn this case, you know that:
Density= 0.7781 g/mLMass= 18 gReplacing in the definition of density:
0.7781 g/mL= 18 g÷ volume
Solving:
0.7781 g/mL ×volume= 18 g
volume= 18 g÷ 0.7781 g/mL
volume= 23.13 mL
In summary, the volume of cyclohexane should be 23.13 mL.
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A mixture of water (H2O) and ammonia (NH3):
Answer:
h20 + NH3
Explanation:
water plus ammonia gives or produces a weak qcid
Answer:
The answer is hydrogen bonding
Explanation:
a different scientist makes zinc iodide by the same method. the scientist obtains 12.5g of zinc iodide. the percantage yeild in this reaction is 92.0% whta is the maximum theoretical mass of zinc iodide produced in this reaction?
A different scientist makes zinc iodide by the same method. the scientist obtains 12.5g of zinc iodide. the percentage yield in this reaction is 92.0% then the theoretical mass is 13.6 g.
What is percent yield?Percent yield is defined as a measure of actual number of mole obtained by reactant in comparison to the theoretical yield.
Percent yield equal to actual yield divided by theoretical yield multiply by 100
As given percent yield is 92%, actual yield is 12.5 g
Then Theoretical yield = actual yield / theoretical yield x 100
= 12.5 / 92 x 100 = 13.6 g
Thus, different scientist makes zinc iodide by the same method. the scientist obtains 12.5g of zinc iodide. the percentage yield in this reaction is 92.0% then the theoretical mass is 13.6 g.
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A sample of Element X is found to contain 75.15% of isotope type 1 (83.9118 amu) and 25.85% of isotope type 2 (86.9092 AMU). Calculate the average atomic mass.
The average atomic mass of the element X is 85.5257 amu
Data obtained from the questionFfrom the question given above, the following data were obtained:
Abundance of isotope 1 = 75.15% Mass of isotope 1 = 83.9118 amuAbundance of isotope 2 = 25.85%Mass of isotope isotope = 186.9092 amuAverage atomic mass =?How to determine the average atomic massThe average atomic mass of the element can be obtained as illustrated below:
Average atomic mass = [(Mass of isotope 1 × Abundance of isotope 1)/100] + [(Mass of isotope 2 × Abundance of isotope 2)/100]
Average atomic mass = [(83.9118 × 75.15)/100] + [(86.9092 × 25.85)/100]
Average atomic mass = 85.5257 amu
Thus, the average atomic mass of the element is 85.5257 amu
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Enter the molecular equation representing aqueous acetic acid neutralized by aqueous barium hydroxide. express your answer as a balanced molecular equation. identify all of the phases in your answer.
The molecular equation representing aqueous acetic acid neutralized by aqueous barium hydroxide:
2CH₃COOH(aq) + Ba(OH)₂(aq) → (CH₃COO)₂Ba(aq) + 2H₂O(l).
CH₃COOH is acetic acid
Ba(OH)₂ is barium hydroxide
(CH₃COO)₂Ba is barium acetate
H₂O is water
Acetic acid is an acid and barium hydroxide is a base. They form salt and water and neutralization reaction takes place.
Neutralization is is reaction in which an acid (in this example acetic acid CH₃COOH) and a base (in this example barium hydroxide) react quantitatively with each other.
Reactants and products are present in undissociated form in molecular equations.
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Under certain conditions, excessive ____________ results in water depletion, which is called ____________ . a sign of water depletion is ____________ .
Under certain conditions, excessive Sweating results in water depletion, which is called Dehydration. A sign of water depletion is Weight Loss.
Dehydration means less intake of fluid such as water, juices etc or by losing more fluid than the amount of fluid you have taken. Fluid can be lost in the form of sweat, tears, urine, vomiting, or diarrhoea.
A dehydration reaction can be defined as the chemical reaction between any two compounds where one of the products is water. Dry mouth and tongue, no tears when crying, Sunken eyes and cheeks are some of the signs of dehydration.
Under certain conditions, excessive Sweating results in water depletion, which is called Dehydration. A sign of water depletion is Weight Loss.
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organized cells:tissues as organ system or organism
Explanation:
The body has levels of organization that build on each other. Cells make up tissues, tissues make up organs, and organs make up organ systems. The function of an organ system depends on the integrated activity of its organs. For instance, digestive system organs cooperate to process food.
A(n) _____________ is a mixture of fuel and oxygen for which the masses of these two components are exactly those needed for complete combustion, with no residue.
A stoichiometric mixture is a mixture of fuel and oxygen for which the masses of these two components are exactly those needed for complete combustion.
A stoichiometric mixture is a balanced mixture of fuel and oxygen.
The fuel and the oxygen react completely without the excesses of either.
The opposite of a stoichiometric mixture is called feeding an excess, when minimum one reactant is an excess amount.
Balanced chemical equation for reaction of combustion one type of a fuel: C₈H₁₈ + 25/2O₂ → 8CO₂ + 9H₂O
Stoichiometric mixture for this example is when fuel (C₈H₁₈) and oxygen(O₂) react in proportion 1 : 12.5.
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Is it the power of material evidence that wins, not the authority of experts that
proves an answer in Science.
Yes, it is the power of material evidence that wins.
Evidence used to support or refute a scientific theory or hypothesis is known as material evidence.Evidence is also used by scientists in various contexts, such as when they apply ideas to real-world issues.Whether a person accepts the data as proof depends on their presumptions or views regarding how observations relate to a theory.A creative hypothesis is developed by a scientist and may be refuted by testing it against evidence or established truths.Evidence can refute a hypothesis by demonstrating facts that are at odds with it. In contrast, the presence of evidence does not preclude the possibility of future, undiscovered evidence supporting the idea.Therefore, it is the power of material evidence that wins, not the authority of experts that
proves an answer in Science.
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give an 3 examples for the following:
Solid to solid
Liquid to gas
*I'm in 6th grade and this subject is science, thanks!)
Explanation:
brass copper mixed with zinc
A dmixture of sugar and gari
A mixture of beans and rice
The is the si unit that expresses the amount of substance. Specifically, it is defined as the amount of substance containing the same number of entities as the number of in exactly 12 g of carbon-12.
The Mole is the SI unit that expresses the amount of substance. Specifically, mole is defined as the amount of substance containing the same number of entities as there are in the 12 grams of Carbon - 12.
Mole is denoted by using symbol mol.
Mole = 6.022 x 10²³ elementary entities.
These number of elementary entities in 1 mole is equal to or called as an Avogadro's number. Mole is equal to 6.022 x 10²³ because this number of entity is same as in exactly 12 g of carbon-12.
It is a very important SI unit of measured which is used by the chemists. Moles are used in measuring in small or tiny things such as atoms, molecules and the other tiny particles.
A mole is the atomic weight of any molecule which is measured in grams. The concept of mole might be used for the mass and number of particles conversion.
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What would be considered as a homogeneous among the the following mixtures?
emulsion
pizza
salad
soda
A sample of monochloro pentaborane (9), b5h8cl, has a mass of 20.1 g. what amount, in moles, does this mass represent?
The number of moles in monochloro pentaborane (9) [tex]B_5H_8Cl[/tex] is 0.37056.
We know that ,
Number of moles = Given mass/ Molar mass
Given mass of monochloro pentaborane (9) is 20.1 g
The molar mass of monochloro pentaborane (9) is
= [tex]5*B + 8*H + Cl[/tex]
= [tex]5* 10.811 + 8 * 1 + 35.453[/tex]
= 54.241
Thus number of moles = 20.1/54.241
= 0.37056
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Phosgene (cl2co)(cl2co), a poison gas used in world war i, is formed by the reaction of cl2cl2 and coco. the proposed mechanism for the reaction is:________
Phosgene was used during the World War I as a poisonous gas. It can be prepared by the action of sunlight on a mixture of carbon monoxide and chlorine gases. Phosgene has the following elemental composition by weight: 12.14% C, 16.17% O and 71.69% chlorine. Its molecular weight is 98.9 g mol-1.
Phosgene is a foremost industrial chemical used to make plastics and pesticides. At room temperature (70°F), phosgene is a toxic gas. With cooling and pressure, phosgene fuel can be converted into a liquid so that it can be shipped and stored.
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among the three named compounds, predict which one has the highest viscosity at 25°c. ethane pentane decane
Decane has the highest viscosity at 25°C.
The viscosity of a fluid is a measure of its resistance to gradual deformation by shear stress or tensile stress.
Viscosity depends on intermolecular interactions and molar mass of the substance.
Ethane, pentane and decane are acyclic saturated hydrocarbons (alkanes).
At 25°C, ethane (C₂H₆) is in gaseous state of matter. Its molecular mass is the smallest of these three molecules, so it has lowest viscosity.
Decane (C₁₀H₂₂) and pentane (C₅H₁₂) are liquids at 25°C, but decane has greater molecular mass, therefore the highest viscosity.
M(C₂H₆) = 30 g/mol; molar mass of an ethene
M(C₁₀H₂₂) = 72 g/mol; molar mass of pentane
M(C₅H₁₂) = 144 g/mol; molar mass of decane
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. Describe how liquid changes to gas using the following terms at least once.
Word Bank: particle speed, thermal energy, particle spacing, liquid, gas, evaporation!
(please give an answer quickly!)
The specific heat of ethanol is 2.46 J/gºC. Find the heat energy required to raise the
temperature
of 193 g of ethanol from 19°C to 35°C
The correct answer is 7596.5 Joules of heat energy is required to raise the temperature of 193 g of ethanol from 19°C to 35°C.
The amount of heat required is calculated as follows:
Q = mC∆T
m = mass =193g of ethanol
C = specific heat = 2.46J/g°C
∆T = T f-Ti = 35-19°C = 16°C
Q = 193g *2.46J/g°C *16°C
Q = 7596.5 J
We are interested in the value of Q, which is the quantity of heat. We would use the equation Q = mCΔT to do so. mass and specific heat are known; using the initial and final temperatures, the T can be calculated. Once we know three of the four quantities in the relevant equation, we can substitute and solve for Q. The amount of heat energy required to raise the temperature of a substance is referred to as its specific heat energy.
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The oxygen anion in carbon monoxide has an atomic number of 8, an atomic mass of 16, and an electrical charge of -2. how many electrons does the oxygen anion have?
Explanation:
Oxygen has atomic number eight. This means that the nuclei of all oxygen atoms have eight protons. A neutral oxygen atom will also have eight electrons.
In an oxygen ion with a
2
−
charge, the number of protons is still 8, but the number of electrons is 10.
This results in the oxygen ion having an octet (8) of valence electrons.
Evaluate 4x+13 when x=-3
4x + 13
4 * -3 + 13
-12 + 13
1
Why is there more variety in kingdom than there is in a species? give an example.
Please I’m begging you I really need to get this thing on this test thing I’m begging you whoever will do it please
Calculate the number of atoms per cubic meter in aluminum. the density of al is 2.71 g/cm3, while its atomic weight is 26.98 g/mol.
The number of atoms per cubic meter in aluminum is 6.04 x 10²².
What is density?"Density is the mass per unit volume. Density is a scalar quantity. It is denoted by d and the symbol for density is given as rho, a Greek symbol. Density is calculated as mass divided by volume."
The density of Al is 2.71 g/cm3
The atomic weight of Aluminum is 26.98 g/mol.
The Avogadro's number is 6.023 x 10²³
To find the number of atoms per cubic meter
N = ρNa / A
N = 2.71 x 6.023 x 10²³ / 26.98 = 6.04 x 10²²
Thus, the number of atoms per cubic meter in aluminum is 6.04 x 10²².
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A new element was discovered on the planet zeb ii. it was named zebnium, and given the symbol zb. if the formula for the zebnate ion is zbo43-, what would be the formula for the zebnite ion?
A new element was discovered on the planet zeb ii. The name of the element zebnium, and the symbol of the element, is zb. The formula for the zebnite ion is ZbO³⁻₃.
What is an element?Chemical elements are a substance that is present in the free form or mixed form in the earth's crust. They are represented in the periodic table.
The ion is the charged form of the element. So it will contain a negative or positive sign in with the charge in the compound.
Thus, if the formula for the zebnate ion is zbo43-, The formula for the zebnite ion is ZbO³⁻₃.
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How can we see all four colors from a hydrogen gas dischrarge tube simutaneously?
There are thousands of hydrogen atoms so together they can let off or group up to form all four colors.
Hydrogen is a chemical element with the symbol H and atomic number 1. Hydrogen is the lightest element. Under standard conditions, hydrogen is a diatomic molecular gas of the formula H2. It is colorless, odorless, tasteless, non-toxic, and highly flammable.
Hydrogen is an energy carrier that can be used to store, transfer, and deliver energy generated from other energy sources. Hydrogen fuel can be produced today by several processes. The most commonly used methods today are natural gas reforming (a thermal process) and electrolysis. It is found in the Sun and most stars, and the planet Jupiter is composed primarily of hydrogen. On Earth, hydrogen is most abundant as water. As a gas in the atmosphere, it is present in trace amounts, less than 1 ppm by volume.
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Calcium carbide, CaC2, is manufactured by reducing lime with carbon at high temperature. (The carbide is used in turn to make acetylene, an industrially important organic chemical.) CaO(s)+3C(s)→CaC2(s)+CO(g) ΔH=464.8kJ Calculate the quantity of energy, in MJ, transferred when a metric ton(1000 kg) of CaC2(s) is manufactured. Ca = 40 g/mol C = 12 g/mol O = 16 g/mol
The energy of the carbide released is 7262.5MJ.
What is the energy?We know that the reaction between calcium oxide and carbon occurs in accordance with the reaction; [tex]CaO(s)+3C(s)----- > CaC_{2} (s)+CO(g)[/tex]. The reaction is seen to produce 464.8kJ of energy per mole of carbide produced.
Number of moles of [tex]CaC_{2}[/tex] produced = 1000 * 10^3 g/64 g/mol
= 15625 moles of calcium carbide
If 1 mole of [tex]CaC_{2}[/tex] transfers 464.8 * 10^3 J
15625 moles of calcium carbide transfers 15625 moles * 464.8 * 10^3 J/ 1 mol
= 7262.5MJ
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The complete hydrolysis of a protein produces a mixture of? polypeptides free amino acids polypeptides and free amino acids dipeptides and free amino acids
The complete hydrolysis of a protein produces a mixture of free amino acids.
Acids are molecules or ions that can donate protons, known as Bronsted-Lowry acids, or form covalent bonds with electron pairs, known as Lewis acids. The first category of acids is proton donors or Brønsted-Lowry acids.
No oil is either an acid or a base. Neutral. Oil is a neutral, nonpolar chemical. That is, it is a viscous liquid at room temperature. It is immiscible with water, but soluble in alcohol and ether. Whole eggs are relatively pH neutral, but egg whites are one of the few foods that are naturally alkaline, with an initial pH of as high as 7.6 when eggs are laid, but the alkalinity increases as eggs age and reach increases. the pH of 9.2.
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What is the relationship between events and patterns?
O A. Patterns cause events to occur.
B. Events that happen over and over form a pattern.
C. Events explain how patterns work.
D. Patterns explain what causes events to happen.
The correct answer is Events that happen over and over form a pattern.
An Event is a collection of an experiment's results. Say, for instance, that you throw a coin as part of an experiment. This experiment's result is whether the coin lands "heads" or "tails." These can be regarded as the events related to the experiment. Data repetitions in predictable ways are referred to as patternsPattern helps to understand the trend of occuring event. The general format that an event follows is called the pattern. Pattern cannot exist without a number of events. Events, however, sometimes happen randomly.Pattern doesn't explain the cause of the event.Therefore the correct answer is B. Events that happen over and over form a pattern.
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Help me pls Its not a exam its about Homogenous and heterogeneous pls help me and pls rigth its description
Answer: hope this helps :)
Explanation:
Heterogeneous:
soy sauce, pizza, fruit salad, halo halo, iced mango juice (assuming this is a mango milkshake), sago milk tea
Homogeneous:
vinegar, salt solution, sugar syrup
abno ka hahaha hatdog hamburger
A student wonders whether a piece of jewelry is made of pure silver. she determines that its mass is 3.17 g. then she drops it into a 10 ml graduated cylinder partially filled with water, and determines that its volume is 0.3 ml. could the jewelry be made of pure silver?
No, the jewelry, could not be made of pure silver.
State characteristics properties of silver.The characteristics of pure silver include being almost white, shiny, soft, ductile, malleable, and a superb conductor of both heat and electricity. Although it is not a chemically active metal, heated concentrated sulfuric acid and nitric acid both attack it and cause nitrate to form. Silver is one of the so-called precious metals, along with gold and the metals from the platinum group. Silver has been used for many years to make coins, ornaments, and jewelry due to its relative rarity, dazzling white color, malleability, ductility, and resistance to air oxidation. Silver is also a soft, malleable, highly ductile, and shiny metal. Despite having the highest electrical conductivity of any metal, its exorbitant cost prevents it from being widely used for electrical purposes. Silver is not a metal that reacts chemically.
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An element with the electron configuration 1s22s22p63s23p6 has how many electrons?
An element with the electronic configuration [tex]1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6}[/tex] has Eighteen electrons.
The electronic configuration [tex]1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6}[/tex] is of a Argon. The Atomic number of argon is eighteen. It is represented by the symbol Ar. It belongs to Group 18 and period number 3 of the periodic table. Argon belongs to the family of noble gases. It is a p-block element. The atomic mass of Argon is 39.948 u.
The number of electrons in an element is equal to the atomic number of the element. As the given electronic configuration is of atomic number eighteen , so the total number of electrons in it is also Eighteen.
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Metallic bonds are responsible for many properties of metals such as conductivity true or false?.
It is true that metallic bonds are responsible for many properties of metals such as conductivity.
Metallic bond is a type of chemical bond.
Metallic bond is formed between electrons and positively charged metal ions.
Substances with metallic bond conduct an electric current in liquid and solid state, because they have mobile electrons.
Most metals (for example sodium, calcium, iron, silver) have strong metallic bond, because strong electrostatic attractive force between valence electrons (metals usually have low ionization energy and lose electrons easy) and positively charged metal ions.
Metallic bond increace electrical and thermal conductivity.
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