Alpha particles are the only radioactive particle that could have been used in the Rutherford gold foil experiment because they are produced naturally by radioactive nuclides that are alpha emitters and so a steady supply was easy to obtain.
As alpha particles do not travel very far from their radioactive source. They cannot pass through a piece of paper, clothes, or even the layer of dead cells which normally protects the skin.
Rutherford used alpha particles in his gold foil experiment in part because his previous research on radioactive decay discovered alpha particles. He wanted to test how alpha particles, which are positively charged, would react with various forms of matter.
Therefore Rutherford uses alpha particles in the Rutherford gold foil experiment.
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a solution is prepared by diluting six times with the dilution factor of 1/5. if the final concentration of the serial dilution is 1.4x10-7 m, calculate the original concentration of the solution. (this is often used in biological sample analysis.)
The original concentration of the solution will be 2.1 × 10⁻³ m
What is dilution factor?Dilution factor is the ratio to dilute the stock solution. This can be expressed as the ratio of the volume of the final diluted solution to the initial volume removed from the stock solution.
Differs from dilution factor. Dilution ratio refers to a simple dilution ratio that combines a unit volume of solute with the desired volume of solvent. On the other hand, the dilution factor refers to the ratio between the volume of the initially concentrated solute and the volume of the final diluted solution. Which is DF = Vₙ / V₀
For the given question,
Vₙ = DF × V₀
Where, Vₙ = Final concentration of the serial dilution
V₀ = Original concentration of the solution
DF = Dilution factor
Since the solution is diluted 6 times then
Vₙ = 1/5⁶ × V₀
1.4x10⁻⁷ = V₀/15625
V₀ = 15625 × 1.4x10⁻⁷
V₀ = 2.1 × 10⁻³ m
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one gram of cd(oh)2(s) is then dispersed in 1.0 l of the solution containing 1 mg/l of cd2 . once the system reaches equilibrium, what is the concentration of cd2 ?
The concentration of Cd⁺² is 8.8×10⁻⁶mol/lit.
What does the term equilibrium mean?When there is no tendency for reactant and product quantities to fluctuate, a chemical reaction is in equilibrium. It is up to us to decide which components of a chemical reaction are deemed reactants and which are products, as well as the direction in which we write about them.
Cd(OH)₂ → Cd⁺² +2OH⁻
↓
1mg/lit
Mass of Cd⁺² ⇒ 1mg/L×1 lit
Mass of Cd⁺² ⇒ 10⁻³gm
Mole of Cd⁺² → 10⁻³/112.4g/mol
Mole of Cd⁺² → 0.0088×10⁻³
Volume of Cd⁺² → 1Lit
Concentration of Cd⁺² →0.0088×10⁻³/1
Concentration of Cd⁺² → 8.8×10⁻⁶mol/lit.
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which confirmatory test will be used for iron (iii) , and which one for nickel (ii)? why was this reagent chosen? should the solution be acidic or basic for this test?
A confirmatory test for iron(iii) is Potassium Ferrocyanide.
The addition of potassium thiocyanate to Fe3+ produces a reddish-brown color due to the formation of this complex. The formation of the reddish-brown color confirms the presence of Fe3+.
The solution should be acidic for this test
A confirmatory test for nickel(ii) is dimethylglyoxime reagent (DMG).
Adding 2 or 3 drops of dimethylglyoxime reagent (DMG) to nickel(ii) will produce a rose-red precipitate of Ni(DMG)2 should form.
The solution should be basic for this test.
What is the confirmatory test for Fe3+?
Fe3+ forms a complex with thiocyanate, SCN−. The addition of potassium thiocyanate to Fe3+ produces a reddish-brown color due to the formation of this complex. The formation of the reddish-brown color confirms the presence of Fe3+.
What is the confirmatory test for Ni2+?
Add dimethylglyoxime(DMG) to the nickel ion solution. Next, add a little bit of ammonia to make the solution basic. It will give a red precipitate. This confirms the presence of Ni2+.
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Consider the hydrocarbon with chemical formula C₁0H8; this compound is an...
alkyne.
alkane.
alkene.
aromatic.
Please help :)
C₁OH₈ formula is an alkene hydrocarbon in the nature of its existence.
What are hydrocarbons?
The only two types of atoms that make up all of an organic complex called a hydrocarbon are carbon and hydrogen. The majority of the time, hydrocarbons are colourless gases with hardly detectable odours. Alkanes, alkenes, alkynes, and aromatic hydrocarbons are the four subcategories that are generally used to classify hydrocarbons. These compounds can have relatively simple structures or relatively complex structures.
The study of hydrocarbons can shed light on other functional groups' chemical composition and behaviour. Liquefied petroleum gas, which is derived from hydrocarbons like propane and butane, is also employed as a source of fuel for commercial reasons (LPG). One of the most basic aromatic hydrocarbons, benzene, is used as the starting point for the creation of numeroubrainly.com/question/17578846s synthetic medications.
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Physical change involves a change in composition.
True
False
A physical change does indeed involve a change in composition. Hence,t the given statement is true.
A physical change is one in which the form of the matter is altered but this does not mean it transforms into another. By composition, we refer to the size and the shape of the matter which is altered after a physical change occurs.
A physical change is reversible. This means that even though the shape and size of the matter change completely, it can always be reverted back to how it was by applying all the conditions that were present there before.
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W hitch role of water is significant for most living things in a biological system
Answer:
to drink
Explanation:
we all need water to drink without it we'll all be dead
the fat, tripalmitin, when hydrolyzed with aqueous naoh followed by acidification with hcl yields glycerol and palmitic acid. if 0.018 mol of tripalmitin is hydrolyzed, what is the theoretical yield of palmitic acid in moles?
When 0.018 mol of tripalmitin is hydrolyzed, the theoretical yield of palmitic acid will be 0.054 moles.
The hydrolysis of tripalmitin with NaOH is saponification where a glycerol compound and fatty acids are released. Thus the fatty acids combined with the Na ion further react with the acid HCl forming a salt. Tripalmitin is a triglyceride obtained from 3 hydroxy groups of glycerol by palmitic acid (hexadecanoic). Thus, this hydrolysis yield carboxylate salt and alcohol called a saponification reaction.
Hydrolysis of 1 tripalmitin releases 3 fatty acids hence, for 0.018 moles, palmitic acid yielded is,
= 0.018 × 3
= 0.054 moles.
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the heat of vaporization of gold is over 4 times greater than that of the heat of fusion of gold. this means that it is easier to
according to the above assertion, melting gold is simpler than boiling it.
What are condensation and vaporization?Evaporation is the transformation of a liquid into its vapor when it occurs below the liquid's boiling point. The transition from a liquid into a gas is known as condensation. The rate of evaporating increases as the temperature rises.
Is vaporizing water boiling a vaporization?The process through which a solution boils and transforms into a gas is known as vaporization. Although evaporation doesn't involve boiling, vaporization is frequently confused with evaporation. The boiling point of a liquid is the heat at which it begins to turn into a gas. Pure water reaches its boiling point at 100°C.
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which one of the following best describes the difference between molar mass and formula weight? a) formula weights are measured in grams per mole, while molar masses are measured in atomic mass units. b) a formula weight is the mass of one molecule or formula unit while a molar mass is the mass of one mole of molecules or formula units. c) molar masses only describe the mass of ionic compounds, while formula weights can describe any compound. d) there is no difference between molar masses and formula weights.
The following best describes the difference between molar mass and formula weight is a formula weight is the mass of one molecule or formula unit while molar mass is the mass of one mole of molecules or formula units.
A formula mass is the sum of all masses of atom present in empirical formula. molecular mass is the mass of one mole of molecule. formula weight base on empirical formula while molecular mass is depend on molecule.
Thus, The following best describes the difference between molar mass and formula weight is a formula weight is the mass of one molecule or formula unit while molar mass is the mass of one mole of molecules or formula units.
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why would you not reduce the flame size below its correct setting if the torch flame is too large for the job?
Lowering the flame can result in the tip overheating.
An overheating plasma system will wear out torch parts quickly and eventually may burn out the torch and leads.
What is an oxy-acetylene torch set?
A gas torch that burns a mixture of acetylene and oxygen to produce a high-temperature flame (3,000°C or 5,400°F) that can weld or cut metal.
Can an oxy-acetylene torch explode?
They occur either because the torch tip touched the work or because of insufficient gas pressure. When this happens, the popping sound turns to a whistle as the gases burn back through the tip and torch head. If not stopped, the fire can travel through and damage the torch, and hoses, and explode the cylinder.Thus, lowering the flame's size may result in the tip overheating.
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what organic analytical technique is paired with the visible spectrum and cannot confirm a substances identity
The organic analytical technique that is paired with the visible spectrum and cannot confirm a substances identity is Spectrophotometry.
What is Spectrophotometry?
By measuring the intensity of light as a beam of light travels through a sample solution, a technique called spectrophotometry can determine how much light a chemical component absorbs. Every substance either absorbs or transmits light across a specific spectrum of wavelengths, according to the fundamental tenet. A known chemical substance's concentration can also be determined using this method. In several disciplines, including chemistry, physics, biochemistry, material and chemical engineering, and therapeutic applications, spectrophotometry is one of the most beneficial quantitative analysis techniques.For more informations on spectrophotometry follow
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I NEED THE ANSWER ASAP
Chemicals that have leached into the soil can be made harmless by _______________________. (binary fission, bioremediation)
Chemicals that have leached into the soil can be made harmless by bio remediation .
What is bio remediation?Bioremediation is a biotechnology process that reduces or eliminates pollution. It is a type of waste management technology that uses organisms to remove or recycle pollutants from polluted areas. There are several remedial measures to clean up contaminated water and solids through chemical treatment, incineration and landfill. There are other types of waste management technologies such as solid waste management, nuclear waste management, etc.Bioremediation is different because it does not use toxic chemicals.How does it work?Bioremediation relies on stimulating the growth of specific microorganisms that use contaminants such as oils, solvents and pesticides as food and energy sources.These microbes convert pollutants into small amounts of water and harmless gases such as carbon dioxide.Can learn more about bio remediation from
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A student performed the following steps in an investigation:
1. Add a few drops of red food coloring to 50 mL of water in a beaker.
2. Stir the contents of the beaker using a glass stir rod.
3. Add 20 mL of yellow vegetable oil.
4. Stir the contents of the beaker using a glass stir rod.
5. Leave the beaker undisturbed for 24 hours.
Which of the following statements about the investigation is most accurate?
A The student made a compound out of pure substances and then made a homogeneous mixture.The student made a compound out of pure substances and then made a homogeneous mixture.
B The student made a solution and then a heterogeneous mixture.The student made a solution and then a heterogeneous mixture.
C The student made a homogeneous mixture and then made a pure substance through a chemical reaction.The student made a homogeneous mixture and then made a pure substance through a chemical reaction.
D The student made a heterogenous mixture and then stirred it until it was a homogeneous mixture.The student made a heterogenous mixture and then stirred it until it was a homogeneous mixture.
The statement that is true is that; the student made a solution and then a het---erogeneous mixture.
What is true about the set up?We know that a solution is composed of a substance that dissolves in a solvent. The solution is made when the red coloring is dissolved in the water and then when we add the oil, there is now a layer that is not in phase with the rest of the solution.
The vegetable oil would then tend to separate out of the rest of the solution and then form a het--erogenous mixture. We can be able to have the two of them come together by stirring the mixture for some time.
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The table below shows the boiling points of
some halogens.
Explain the trend in the boiling points of the
halogens.
Answer:
Boiling point decrease from left to right of the periodic table
Explain why onions make you cry
Which statement describes a causal relationship between two variables?
The statement that describes a casual relationship between two variables would be a correlation.
What is correlation?Correlation is a statistical term used to describe the relationship between two variables. The strength of the correlation between two variables is measured by a factor known as the correlation coefficient. The correlation coefficient is represented by r.
The value of r ranges from -1 to +1.
A positive r means that the two variables have the tendency to increase together. That is a direct relationship.A negative correlation means the two variables have an inverse relationship. As one is increasing, the other is decreasing, and vice versa.A correlation of 0 means that the two variables have no linear correlation with each otherA correlation of 1 means the two variables are perfectly correlated.Thus, the casual realtionship between two variables is best described as correlation.
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if x x represents the molar solubility of b a 3 ( p o 4 ) 2 bax3(pox4)x2 , what is the correct equation for the k s p ksp ?
If x represent the molar solubility of Ba₃(PO₄)₂ Bax₃(POx₄)x₂ the correct equation for Ksp is (3x)³(2x)².
The equation is given as :
Ba₃(PO₄)₂ ⇄ 3Ba²⁺ + 2PO₄³⁻
if x represent molar solubility then , we get :
Ba₃(PO₄)₂ ⇄ 3Ba²⁺ + 2PO₄³⁻
3x 2x
therefore , the solubility product constant is given as :
Ksp = (3x)³(2x)²
The solubility product constant is the equilibrium constant which used for the dissolving of solid substances into the aqueous solution. The solubility product constant is denoted as Ksp. The value of solubility constant depends on temperature.
Thus, If x represent the molar solubility of Ba₃(PO₄)₂ Bax₃(POx₄)x₂ the correct equation for Ksp is (3x)³(2x)².
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Body fluid is the liquid portion of our cells and tissues. In adults, what is the percentage of our body weight that is water?.
Answer:
50-70%
Explanation:
In adult men, about 60% of their bodies are water. However, fat tissue does not have as much water as lean tissue. In adult women, fat makes up more of the body than in men, so they have about 55% of their bodies are made of water.
Which describes the MOST LIKELY effect of the mismatch on future birds?
A. There could be a shift to earlier reproduction in
the birds.
B. The next generations of birds may choose to not
reproduce.
C. There could be a shift to later reproduction in the
birds.
D. The next generations of birds may choose to
reproduce more often.
The statement which best describes the most likely effect of the mismatch on future birds is that there could be a shift to later reproduction in the birds and is therefore denoted as option C.
What is Reproduction?
This is referred to as the process in which an offspring is produced from their parent or cells and involves the fusion of gametes.
In the effect of mismatch on future birds, there will be a reduction in the birds getting a mate which therefore shift to later reproduction and is therefore the reason why option C was chosen as the correct choice.
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The statement that describes the most likely effect of the mismatch on future birds is that there could be a shift to later reproduction in the
birds.
So option C is correct.
What is reproduction?Reproduction is described as the biological process by which new individual organisms offspring are produced from their "parent" or parents.
If there is mismatch on future birds, one of the many effects is that there could be a shift to later reproduction in the birds which the consequences of such mistiming in reproduction are reduced reproductive output.
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question content area stirring a solute into a solution increases the net dissolving rate (reduces the dissolving time to reach equilibrium) because the ...
Stirring a solute into a solution increases the net dissolving rate because stirring affects how quickly a solute dissolves in a solvent but does not affect how much solute will dissolve.
The sum of solute that will break up is influenced by temperature - more will break down at higher temperatures. Typically called the solubility of the solute.
Charts of the solvency at distinctive temperatures can be utilized to decide how much will break down, or at which temperature a given arrangement will be gotten to be saturated.
Stirring moves the dissolvable particles around, permitting them to connect with the strong pieces of undissolved solute and transporting the broken-up solute absent into the bulk of the solution.
In the nonappearance of blending, the concentration of solute will be most noteworthy near the pieces of solute, so more solute won't break down into the arrangement until the broken-up solute has been transported absent by dissemination.
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How many moles is 1.2
×
1023 atoms of Ne?
Answer:
the answer would be 7.584*10^23
Energy made available through the flow of electric current is called...
Radiant
Sound
Elastic
Electrical
The energy transfer in the form of light or heat is called radiant energy. Thus the flow of electric current can be called as radiant.
What is radiation?Radiation is a mod of energy transfer through vacuum and the electromagnetic radiations are such energy transfer from stars and space which hits the earth surface.
Sound is a mechanical wave only travels through a medium whereas electromagnetic waves does not need a medium to travel. Electromagnetic radiation is the combination of an electric field and magnetic field.
Hence, the flow of electric current by which the energy made available is called radiant.
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How are biofuel prepared?
Answer:
fermentation of crops that are high in sugar (starch) or fat into ethanol,
Explanation:
270g of glucose no.of molecules
Next question: 40g of ammonium nitrate
Question 1. There are [tex]9.025*10^{23}[/tex] molecules in 270g of glucose.
Question 2. There are [tex]3.009*10^{23}[/tex] molecules in 40g of glucose.
Explanation:Question 1. 270g of glucose, no. of molecules.1. Find the chemical formula of glucose.Formula: [tex]C_{6} H_{12} O_{6}[/tex]
2. Find the molar mass of this compound.Using the molar mass of each element, which can be found in the periodic table, we make the following calculations:
Molar mass of C: 12.011 u
Total mass of C in compound: (12.011 * 6)= 72.066
Molar mass of H: 1.008 u
Total mass of H in compound: (1.008 * 12)= 12.096
Molar mass of O: 15.999 u
Total mass of O in compound: (15.999 * 6)= 95.994
Why did we multiply the molar mass of C, H and O by 6, 12, and 6? This is because the formula contains 6, 12, and 6 atoms of each element, respectively.
Add up all masses:
72.066 + 12.096 + 95.994= 180.156 g/mole
This result means that 1 mole of glucose has a mass of 180.156 grams.
3. Calculate the number of molecules.Furthermore, 1 mole of any compound has a total of [tex]6.022*10^{23}[/tex] molecules. To find the amount of molecules, find the amount of moles and then the amount of molecules. Do it in the following fashion:
180.156g -----> 1 mole
270g -----------> x
[tex]\frac{270*1}{180.156} =1.499[/tex]
270 grams of glucose is the equivalent of 1.499 moles of said compound.
Now, find the number of molecules using the amount of moles calculated previously.
180.156g ----> [tex]6.022*10^{23}[/tex]
270g ---------> x
[tex]\frac{(270*6.022*10^{23} )}{180.156} =9.025*10^{23}[/tex]
4. Conclusion.There are [tex]9.025*10^{23}[/tex] molecules in 270g of glucose.
Question 2. 40g of ammonium nitrate, no. of molecules.Repeat the same process explained previously:[tex]NH_{4} NO_{3}[/tex]
N: 14.007 u
N: 14.007 u
O: (15.999 * 3)= 47.997 u
14.007 + 4.032 + 14.007 + 47.997= 80.043 g/mole
80.043g ----> [tex]6.022*10^{23}[/tex]
40g -----------> x
[tex]x=\frac{(40*6.022*10^{23}) }{80.043} =3.009*10^{23}[/tex]
There are [tex]3.009*10^{23}[/tex] molecules in 40g of glucose.
A chemist burns isopropyl alcohol (C3H8O) according to the following equation: C3H8O + 3 O2 → 3 CO + 4 H2O If he burns 275 grams of C3H8O in excess oxygen, how many grams of water will be made?
Answer:
329.8g of H2O are produced
Explanation:
You have to do stoichiometry to convert grams of isopropyl alcohol to grams of water.
Convert grams of isopropyl alcohol to moles of isopropyl alcohol (use molar mass of isopropyl alcohol) Convert this to moles of water using molar coefficients Convert moles of water to grams (use molar mass of water)The idea that younger rock layers are deposited on top of older rock layers in an undisturbed section of sedimentary rock can best be explained by which of Steno's principles?
A. principle of superposition
B. principle of original horizontality
C. principle of original lateral continuity
The idea that younger rock layers are deposited on top of older rock layers in an undisturbed section of sedimentary rock can best be explained by the principle of superposition.
Principle of superposition is the major principle of geography. The oldest layer of the rock is consider as a base rock. after the oldest layer the layered formed are in ascending order of younger layer. so, from this principle we can younger and older one.
Thus, The idea that younger rock layers are deposited on top of older rock layers in an undisturbed section of sedimentary rock can best be explained by the principle of superposition.
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Listed in the Item Bank are some important labels for sections of the image below. Match each label to the corresponding area it identifies in the image.
Silicon, Arsenic and Antimony
Can exchange electrons with each other to form ionic compounds
May have no luster
Tin, Calcium and Potassium
Hydrogen, Oxygen and Chlorine
Can be electrical conductors
Comprised of atoms
The corresponding match for each element is as follows:
Silicon, Arsenic, and Antimony - Metalloids
Can exchange electrons with each other to form ionic compounds _ Metals and non-metals
May have no luster - Metalloids and Non-metals
Tin, Calcium, and Potassium - Metals
Hydrogen, Oxygen, and Chlorine - Non-meatals
Can be electrical conductors - Metals and metalloids
Comprised of atoms - all
What are the properties of metals, metalloids and non-metals?The elements can be classified into three;
metalsmetalloids, andnon-metalsEach of these classes of elements has its own unique properties. The properties of the three classes of elements include the following:
Metals - metals are hard and mostly solid substances with luster. They are good conductors of heat and electricity. Metals form ionic compounds with non-metals by exchanging their electrons. Examples are calcium, sodium, copper
Metalloids - they are mostly solid substances that are intermediate conductors of heat and electricity. They may have no luster. Examples are Silicon, Arsenic, and Antimony.
Non-metals - non-metals are soft and mostly gaseous substances with no luster. They are poor conductors of heat and electricity. Non-metals form ionic compounds with metals by exchanging their electrons.
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according to dalton, if 6g of carbon react with 17 g of hydrogen, how many grams of carbon combine with 85 g of hydrogen?
Considering Dalton's theory 30 grams of Carbon combines with 85 grams of hydrogen.
Daltons theory is based on the law of conservation of mass and also the law of constant composition. The first part of his theory states that all matter is made up of atoms, and these atoms are indivisible. The second part of this theory says that atoms of a given element are identical in mass and also in properties. But it will be different only in case of different types of molecules present together.
According to Daltons theory if 6 grams of Carbon is reacting with 17 grams of Hydrogen then for 85 grams of Hydrogen the amount of carbon required will be
⇒ 6 × 85 = 30
17
Therefore 30 grams of Carbon is required to combine with 85 grams of Hydrogen.
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sodium atoms contain 11 protons and 11 electrons with a mass of approximately 23. the atomic number of sodium is therefore:
What state of matter is H2O above 100°C?
Answer:
Gas
Explanation:
Similarly,if we heat a volume of water above 100 degrees Celsius, or 212 degrees Fahrenheit, water changes it's phase into a gas called water vapor
