The composition, in atom percent, of an alloy that consists 90.5 wt Ag and 9.5 wt Cu is 84.5% and 15.2%.
Here, the lever rule is used to determine the composition of co-existing phases which are, Ag and Cu, of an alloy.
The given data is :
Atomic weight of silver (Ag), M(Ag) = 107.87 g/molAtomic weight of copper (Cu), M(Cu) = 63.55 g/molWeight percent of silver (Ag), W(Ag) = 90.5 wtWeight percent of copper (Cu), W(Cu) =9.5 wtTo calculate composition of silver, expression used is,
C(Ag) = W(Ag) × M(Cu) x 100
( W(Ag) × M(Cu) + W(Cu) × M(Ag) )
Substituting the values in the above expression,
C(Ag) = ( 90.5 × 63.55 ) x 100
( 90.5 × 63.55 + 9.5 × 107.87 )
C(Ag) = 84.5%
To calculate composition of copper, expression used is,
C(Cu) = W(Cu) × M(Ag) x 100
( W(Ag) × M(Cu) + W(Cu) × M(Ag) )
Substituting the values in above expression,
C(Cu) = (9.5 × 107.87) x 100
( 90.5 × 63.55 + 9.5 × 107.87 )
C(Cu) = 15.2%
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Change 1
Change 1 is:
impossible
a physical change
a chemical change
Sample of Substance X
Change 2
Change 2 is:
impossible
a physical change
a chemical change
Change 3
Change 3 is:
impossible
a physical change.
a chemical change
X
S
In the original sample of substance X, there are 12 molecules and each molecule is made of 2 small red spheres and one blue sphere in the middle.
Change 1:Change 1 has the same total number of red and blue spheres as the original sample, but the structure of molecules has changed. As a result, this is a chemical change.
Change 2:In Change 2, the structure of molecules is changed. Some molecules contain solely red spheres, whereas others include both red and blue spheres. Furthermore, the total number of molecules is greater than the number of molecules in the original sample. This violates the principle of conservation of mass. Hence, this is an impossible change since extra matter was created in this change.
Change 3:In Change 3, the number of the molecules and the structure of the molecules is same as the orignial sample. Hence, it is a physical change.
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When atp is hydrolyzed to power a condensation reaction, what happens to the phosphate molecule that is released?
The phosphate molecule that is released it is coupled to a different ADP molecule to make new molecule of ATP.
Hydrolysis of high-energy compound (ATP) using water:
ATP + H₂O → ADP + Pi
ATP is short for adenosine triphosphate.
Hydrolysis is a reaction that breaks down the chemical bonds between molecules via the addition of a water molecule.
A condensation reaction is a reaction that joins two molecules in a chemical bond.
ATP is resynthesized in a condensation reaction that adds an inorganic phosphate group to ADP. The addition of a phosphate group is catalyzed by the enzyme ATP synthase.
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Notice that in the last problem you calculated the grams of oxygen needed. what would the volume of this oxygen be at stp? report your answer in liters to the nearest whole number.
The volume of oxygen required at STP is 7 L.
STP is a pressure of a hundred kPa and a temperature of 273.15 k. Or, 1 mole of any perfect gasoline occupies 22.7 L at STP.
therefore, we need to discover the range of moles of oxygen required within the reaction.
using the molar mass of water,
10.five g × 1 mole of water/ 18.02 g = 0.577 moles of water.
1: 2 is the ratio between oxygen and water in a water molecule, because of this 1 mole of oxygen produces 2 moles of water.
0.577 moles of H₂O × 1 mole O₂ / 2 moles of H₂O = zero.2885 moles O₂.
So, if 22.7 L at STP is occupied via 1 mole, then
zero.2885 × 22.7 L / 1 mole = 6.548 L
Rounded to the nearest entire wide variety, we get 7 L.
consequently, the quantity of oxygen at STP is 7L.
standard temperature and strain (STP) is described as 0oC (273.15K) and 1atm strain. The molar extent of a gasoline is the extent of 1 mole of a fuel at STP . At STP, one mole (6.02×1023 representative debris) of any gasoline occupies a volume of twenty-two.4L
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Resonance structures for a molecule are an indication of overall lower energy for the molecule. True or false?.
Answer:
I think it's false
Explanation:
According to rutherford's nuclear theory, the number of negatively charged particles outside the nucleus is?
According to Rutherford's nuclear theory, the number of negatively charged particles outside the nucleus is equal to the number of positively charged protons inside it.
What is Rutherford's nuclear theory?
According to the Rutherford atomic theory, an atom is made up of a compact, dense, positively charged nucleus that is around by smaller, negatively charged particles called electrons. It explains the atomic model, according to which an atom's mass is concentrated in its nucleus, around which the electrons, or negatively charged particles, move.
In accordance with Rutherford's nuclear theory, an oxygen atom has 8 protons and 8 electrons, whereas a calcium atom cannot have 20 protons and 20 electrons. This is because the number of negatively charged particles outside the nucleus is equal to the number of positively charged particles inside the nucleus.
Thus, the number of negatively charged electrons outside the nucleus is equal to the number of positively charged protons inside the same.
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What is the nitrogen source of for the carbamoyl phosphate in pyrimidine synthesis? tetrahydrofolate glutamine orotate urea ammonium iron
Glutamine is the nitrogen source of the carbamoyl phosphate in pyrimidine synthesis.
Carbamoyl Phosphate generates when enzyme bound carbamate reacts with second ATP, with release of free enzyme, and ADP.
The atoms of pyrimidine ring comes from the aspartic acid and carbamoyl phosphate (CP). The first step of the pathway is the formation of former or latter molecule. The enzyme named carbamoyl phosphate synthetase II catalyses the latter molecule. Glutamine is used by this enzyme as the nitrogen source.
N-acetylglutamate activates this mitochondrial enzyme carbomoyl phosphate synthetase but it is not an allosteric activator. It is located in the cytoplasm.
CPS II catalyzes the synthesis of carbamoyl phosphate which is ATP dependent synthesis from glutamine or ammonia.
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What term refers to exercise that primarily uses the oxygen-dependent energy system, oxidative phosphorylation?
Aerobic refers to exercise that primarily uses the oxygen-dependent energy system, oxidative phosphorylation.
Aerobic Respiration is the method of cellular respiration that takes place in the presence of oxygen gasoline to produce electricity from food. This type of breathing is frequent in most of the plant life and animals, birds, humans, and different mammals. In this process, water and carbon dioxide are produced as quit products.
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constant temperature and the pressure upon it. Write down the relationship in terms of a (a) Proportion (b) equation (c) formula
Answer:
Proportion : The Equality of two ratios
Equation: Values of two mathematical expressions are equal.
Formula: Mathematical relationship or rule expressed in symbols.
Explanation:
Even though h-bonding occurs in ammonia and ethanol, they cannot be used to replace water in living cells because ___________________.
Even though h-bonding occurs in ammonia and ethanol, they cannot be used to replace water in living cells because compared to amonia and ethanol, water is more polar.
Compared to amonia and ethanol, water is more polar and may form H bonds. Additionally, water is a better solvent or can dissolve a wide variety of solvents that are employed by living cells.
Hydrogen bonds can be formed by ammonia. When hydrogen bonds between water molecules are disrupted, comparable links between water and ammonia molecules can take their place. Ammonium and hydroxide ions are created when some of the ammonia combines with the water.
A hydrogen bond can develop between a water molecule and an ethanol molecule if there is just one pair of electrons in the water molecule, which will link with the oxygen atom and the polar hydrogen atom to create the bond.
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If the acid A has a pKa of 5 compared acid B with Pka of 9,how much stronger is acid A over B
Acid A is 10^4 = 10000 times stronger than B. This istrue if acid A has a pKa of 5 compared acid B with Pka of 9.
Acid strength is quantified by the acid dissociation constant (Ka). The acid is more potent the higher the value. A higher pka indicates lower acidity. Therefore, a weaker acid results from a greater pKa and a smaller Ka. A weaker acid is one with a higher pKa.
Since pKa = -log10(Ka), an acid is 10 times stronger for each pKa value of 1 below another. Acid A is therefore 10^4 = 10000 times stronger than acid B.
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-1.42, 3, 32.5%, √4, 2³, −0.375, 3/8 as a decimal least to greatest
Answer:
-1.42, -0.375, 32.5% (.325), 3/8 (.375), √4 (2.0), 3 (3.0), 2³ (8.0)
When combing your dry hair with a hard rubber comb, you rub electrons from your hair onto the comb. (a) is your hair then positively- or negatively-charged?
When combing your dry hair with a tough rubber comb, you rub electrons from your hair onto the comb then our hair is charged because On rubbing the comb with dry hair, the electrons from the hair are transferred to the comb due to Static energy.Hence comb becomes charged .
What is Static energy?
Static electricity is an imbalance of electric charges within or on the surface of a material or between materials.
Static electricity is the result of an imbalance between negative and positive charges in an object. These charges can build abreast of the surface of an object until they find a way to be released or discharged.
What is static energy used for?
Static electricity has several uses, also called applications, within the real world. One main use is in printers and photocopiers where static electric charges attract the ink, or toner, to the paper. Other uses include paint sprayers, air filters, and mud removal. electricity can also cause damage.
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A chemist adds a chemical to pure water and there is a 100-fold increase in the concentration of hydrogen ions. What is the best approximation of the new ph value?.
A chemist adds a chemical to pure water and there is a 100-fold increase in the concentration of hydrogen ions. the new ph value is 5.
What factors influence a solution's pH?The pH of a solution is determined by the concentration of hydrogen ions in that solution. The pH value is the logarithmic value of the inverse of hydrogen ion activity. Because the concentration of hydrogen ions is frequently very low, ion activity is considered to be equal to the concentration of hydrogen ions.
What's the connection between ion activity and pH?The logarithmic value of the inverse of hydrogen ion activity is the pH value. Because the concentration of hydrogen ions is frequently very low, ion activity is assumed to be equal to the concentration of hydrogen ions. The pH is then the logarithm of the inverse of the concentration of hydrogen ions.
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the diameter of a hydrogen atom is about 1.04 cross times 10 to the power of short dash 10 end exponent meters. a protein molecule has an overall length of 1000 times (1 cross times 10 cubed) the diameter of a hydrogen atom.
The diameter of a hydrogen atom is 1.04 × 10⁻⁷ meters.
Diameter or the atomic radius of an atom is a measure of the size of that atom. It is distance from the center of the nucleus to the outermost isolated electron of an atom.
d(H) = 1.04 × 10⁻¹⁰ m; a diameter of hydrogen atom
If a protein molecule has an overall length of 1000 times(1×10³) the diameter of a hydrogen atom, than:
d(protein) = 1.04 × 10⁻¹⁰ m × 1×10³
d(protein) = 1.04 × 10⁻⁷ m; diameter of a protein molecule
Protein is composed of amino acid linked with peptide bond.
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Solid sodium is reacted with 45.0 mL of a 2.00 mol/L H2SO4(aq) and aqueous solutions of hydrochloric acid and sodium sulfate are formed. How many moles of sodium sulfate are produced?
Number of moles of sodium sulfate is 0.633 mol.
The amount of a substance in a specific volume of solution is known as its molarity (M). The number of moles of a solute per litre of a solution is known as molarity.A count of a very large number of particles is called the number of moles. The Avogadro number is equal to one mole of any material.Given,
volume of solution= 45mL
molarity of soultion = 2.00 mol/L
we have to find number of moles of sodium sulfate.
Molar mass of sodium sulfate = 142
Number of moles of Na2SO4 = (Molarity of Na2SO4 × volume of the solution) / molecular mass of Na2SO4.
No. of moles of H2SO4 = (2 × 45) / 142 = 0.633 mol
Therefore, number of moles of sodium sulfate in solution is 0.633
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You probably use the term heat many times a day. As an example, when you cook, dinner, you heat your dinner on a hot stove. When you place a piece of cool metal in the sun, it is heated by the sun’s energy. Why is heat the correct term to use in these examples?
When you place a piece of cool metal in the sun, it is heated by the sun’s energy they show that heat flows from warmer to cooler
In the given example conduction concept are seen conduction means conduction is the transfer of heat energy from one substance to another or within a substance in which heat is transferred via conduction and when heat energy is converted through piece of metal then the substance itself does not flow and heat is transferred internally, by vibrations of atoms and molecules and electrons can also carry heat, which is the reason metals are generally very good conductors of heat
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Considere the rate law rate = k[co2][n2]^n what is the order with respect to co2?
The order with respect to CO2 is 1 i.e it is first order with respect to CO2.
The rate of any chemical reaction can be determined by chemical kinetics, which is a branch of chemistry dealing with the study of reaction rates and their mechanisms.
According to chemical kinetics, the rate of a reaction depends upon its reactants which is given by the rate law expression,
Let us take a hypothetical example to understand the rate law expression
aA+ bB ⇒ cC
In the above reaction, we can write the rate law expression as,
Rate =k [A]^x[B]^y, where x and y are the orders of the reactants, a and b respectively and k is a constant.
Similarly, in the expression Rate = k [co2][n2]^n, the order of CO2 is 1 and the order of N2 is n.
Hence, the order with respect to CO2 is 1 i.e it is the first order with respect to CO2.
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How much energy would be released as an electron moved from the n=4 to the n=3 energy level?
The energy released when electron move from n=4 to n=3 is 0.66 eV
We know that in an atom energy of nth state is
[tex]E_n = -13.6/n^{2}[/tex] eV
where n is the energy level
Therefore,
[tex]E_4 = -13.6/4^{2} \\E_3 = -13.6/3^{2}[/tex]
Thus, [tex]E_4[/tex] = -0.85eV
[tex]E_3[/tex] = -1.51eV
Therefore, total mount of energy released in moving electron from n=4 to n=3 is given by -
[tex]E_4 -E_3[/tex]
= -0.85 - ( -1.51)
= 0.66eV
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How would you prepare 10. 0 ml of a 0. 25% m/v hcl solution if 1% m/v hcl was available? how much 1% m/v hcl is needed? how much distilled water is used?.
7.5ml distilled water is used to 0. 0 ml of a 0. 25% m/v hcl solution if 1% m/v hcl was available
Here so 2.5 ml of 1% m/v HCl and (10 - 2.5) = 7.5 ml distilled water taken to prepare 10 mL of a 0.25% m/v HCl solution. 2.5 mL of 1 % m/v HCl is needed. 7.5 ml of distilled water is used to make 10ml solution and in that solution 1% hcl means 3.6 hcl is needed. mass of hcl is 36g/mol
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At what approximate temperature will the reaction mixture containing methyl salicylate and 30 ml of 4m sodium hydroxide boil?
At 223.3°C the solution will boil.
What is methyl salicylate?The organic substance methyl salicylate has the chemical formula C₈H₈O₃. It is salicylic acid's methyl ester. It is a clear, viscous liquid that is commonly referred to as "minty" since it is a component of mint candies. It has a sweet, fruity aroma reminiscent of root beer.
What is sodium hydroxide?Lye and caustic soda are other names for sodium hydroxide, an inorganic substance having the formula NaOH. It is a white, solid ionic substance made up of the cations sodium (Na+) and the anions hydroxide (OH).
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If the density of a metal sample is 1.56 g/l and the volume of the sample is 250ml, calculate the mass of the metal sample.
The metal sample with a density of 1.56 g/l and a volume of 250ml, has a mass of: 0.39 g
The density formula and the procedure we will use is:
ρ = m/v
Where:
v= volumeρ= densitym= massInformation about the problem:
ρ= 1.56 g/lv= 250mlm= ?By converting the volume units from (ml) to (l) we have:
v= 250ml * 1 l /1000 ml
v = 0.25 l
Applying the density formula and clearing the mass (m), we get:
m = ρ * v
m = 1.56 g/l * 0.25 l
m = 0.39 g
What is density?It is a physical quantity that expresses the ratio of the body mass to the volume it occupies.
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Fatty acids that have been chemically altered so that ____________ atoms are on opposite sides of a double bond are called ____________ fatty acids.
Fatty acids that have been chemically altered so that hydrogen atoms are on opposite sides of a double bond are called trans fatty acids.
What are fatty acids?
Fatty acids are the building blocks of fat found in both our food and our body. During digestion, the body transforms lipids into fatty acids so they may be absorbed into the bloodstream. Three fatty acid molecules are joined together to form a molecule called a triglyceride.
Saturated, monounsaturated, and polyunsaturated fatty acids are all present in dietary fats. Even while meals include all three forms of fatty acids, they are frequently grouped according to the prevalent type.
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How does the arrangement of atoms or molecules in a gas differ from the arrangements in liquids and solids?
Answer: Gas has loosely packed atoms, liquids have mediumly packed atoms, and solids have tightly packed atoms.
Explanation: Solids have tightly packed atoms which is what keeps them in their defined shape. They have a defined volume and a defined shape.
Liquids have mediumly packed atoms because liquids don't have a definite shape and take the shape of the container they are placed in. It has a definite volume, but an indefinite shape.
Gases have loosely packed atoms because gases can float around anywhere. They don't have a definite volume, and they don't have a definite shape.
Which 1 m solution would have the highest vapor pressure at a given temperature?
c6h12o6 kcl nac2h3o2 li2so4
The 1 m solutions of C6H1O6 have the highest vapor pressure at a given temperature.
Vapor pressure is defined as the tendency of a liquid to convert into a vapor state. The vapor pressure depends on temperature, surface area, intermolecular forces, and the number of moles of a substance.
The higher the number of moles of particles in solute, the lower the vapor pressure and vice versa.
C6H12O6 has the highest vapor pressure among the given options because it has the lowest number of moles or particles in the solute. The remaining options have more moles of particles in the solute.
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a covalent bond involves: a. transferring of b. sharing protons c. transferring protons d. sharing electrons
A covalent bond involves: d. sharing electrons
The atoms of a molecule are held together by electrical forces that hold the atoms together, this is due to the electrical attraction between the electrons of the atom of one element and the nucleus of the other atom, this force of attraction is called covalent bond.
A covalent bond involves the sharing of electrons that are in the last energy layer of the atoms because they are the most likely or willing to be shared.
An example of a covalent bond is the bond between a hydrogen atom and a carbon atom in methane.
What is an atom?The atom is the smallest part of the composition of matter, it is indivisible and is composed of a nucleus that has protons and neutrons, and around the nucleus there are the electrons.
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We will now examine the patterns that exist for the ratios in which metal and nonmetal elements combine in order to learn more about patterns within this type of compound (between a metal and a nonmetal).
3. Write the formula and draw the particle diagram for each compound, given the two elements.
The ratio within each compound is given.
The right answer is given in the picture.
To find the formula of an ionic compound, first, identify the cation and write down its symbol and charge. Then identify the anion and note its sign and charge. Finally, the two ions combine to form an electrically neutral compound.
Particle diagram Elements and compounds can be represented using particle diagrams. This is a box with colored spheres drawn to represent atoms or molecules. These diagrams can represent elements and compounds and their molecular composition by the types of spheres and how they are connected. Particle diagrams are used to show particles, atoms, or molecules within matter. A diagram showing particles in a substance.
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Complete combustion of 2.00 g of a hydrocarbon produced 6.43 g of co2 and 2.19 g of h2o. what is the empirical formula for the hydrocarbon? insert subscripts as necessary.
Empirical formula for the hydrocarbon is C₅H₂
Moles of C=6.43CO2 x 1 mol CO₂/44 g x 1 mol C/mol CO₂=0.14 moles of C
Moles of H=2.19 H₂O x 1 mol H₂O/18 g x 2 mol H/mol H₂O=0.12moles of H
Dividing both by 0.14
1 mol C=0.8571mol H
Multiplying both by 3
5 mol C
2 mol H
Empirical formula =C₅H₂
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An aqueous solution contains 0.35 m ammonium nitrate. one liter of this solution could be converted into a buffer by the addition of:_________
Answer:
A strong base, such as NaOH. The amount of OH added shouldn't exceed 0.35 mols (though i would stop at 0.30 mols)
Explanation:
a weakly basic salt can be turned into a buffer by the addition of a strong base, and a weakly acidic salt can be turned into a buffer with a strong acid
Describe how plants promote mechanical and chemical weathering but inhibit erosion.
Rocks are wedged apart by plant roots that grow through fissures in quest of water and minerals. Additionally, some fungus, lichens, and plants create acids and other substances that help the chemical weathering of earth minerals. Root systems restrain by adhering to and stabilizing rocks and soils.
How do plants promote mechanical and chemical weathering?
Chemical and mechanical weathering can be brought on by plants. Plants' roots penetrate rocks and cause them to fracture as a result of mechanical weathering. It may also occur on sidewalks or in streets. Plants produce chemical weathering by releasing acids or other chemicals through their roots onto rocks, causing the rocks to fracture and develop fissures.Chemical weathering is also brought on by animals and plants. Plant roots draw components from the minerals as they absorb nutrition. The rock undergoes a chemical alteration as a result.
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If 16% of the nucleotides in one strand of a dna molecule contain the base g, what percent of the nucleotides on the complementary strand will also contain the base g?
If 16% of the nucleotides in one strand of a DNA molecule contain the base g, what percent of the nucleotides on the complementary strand will also contain the base g but it is impossible to determine from the information given.
DNA double helix. The hydrogen bonds are damaged and the helix is opened. Each strand of DNA acts as a template for synthesizing a brand new complementary strand. During replication, equal DNA double helices are formed, every with a brand new strand and a vintage strand.
Also, cytosine (C) enhances guanine (G) and adenine (A) enhances thymine (T). Therefore, the complementary strand for 5'-TAGAC 3' is 3'-ATTCG 5', similar to alternative c.
His Chargaff's discovery of A = T and C = G, combined with a few very essential X-ray crystallographic research through British researchers Rosalind Franklin and Maurice Wilkins, Watson Contributed to Crick's derivation of his 3-D double helix model. DNA structure.
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