The 1.5 ml of a 10% solution that was made into a 3.0 ml solution by adding normal saline now has a new concentration of 5%.
The amount of material in a certain area is referred to as concentration in chemistry. Another definition states that concentration is the ratio of a solution's solute to its entire solution or solvent. Mass per unit volume is a common way to express concentration. However, moles or units of volume can also be used to express the solute concentration. Concentration could be per unit mass instead of volume. Concentration can be computed for any mixture, despite often being used with chemical solutions.
By mathematically dividing the mass, moles, or volume of the solute by the mass, moles, or volume of the solution, one may calculate the concentration (or, less commonly, the solvent).
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The following reaction occurred when a strip of aluminum was placed in a nickel solution. Which half-reaction represents the oxidation that has occurred in the reaction?
The reaction that shows oxidation is the one that has been shown in option D.
What is oxidation?We have to know that the process that we call oxidation would have to do with the loss of the electrons that we have in a system. If we are dealing with a neutral atom that has been oxidized then we would see an increase in the oxidation number of the atom. This same effect would be seen if we are looking at the oxidation of any other chemical specie that is under consideration.
Ni lost and electronNi^2+ was formedA total of two electrons were lost in the process.We need to look at the reactions that have been shown in the options that we have and then compare it with the overall redox reaction equation that we see at it has been shown in the reaction that has been attached to the question that we have in the attachment that is shown above here.
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Early chemists, known at the time as alchemists, had a difficult time understanding the Law of Conservation of Mass. Using the burning of wood as an example, what property of matter made this law difficult for early scientists to understand?
Different types of wood burned differently.
Wood is heavier than ash.
The fire was too bright to observe the reaction.
The gases produced escaped to the atmosphere.
Answer:
The gases produced escaped to the atmosphere.
The world’s record for the largest cup of coffee was broken on October 152010, with a 2010 gallon cup of coffee in Las VegasNevada. If a cup of coffee contains 237 mL of coffeehow many cups of coffee would be required to fill this enormous coffee cup?
The number of coffee cups that would be required to fill the enormous coffee cup would be 32 cups.
Dimensional analysisThe world's largest cup of coffee can hold 2010 gallons of coffee as recorded in Las Vegas.
A normal coffee cup will only hold as much as 237 mL of coffee. Recall that:
1 gallon = 3.78541 LIf 1 gallon = 3.78541 L
2010 gallons = 2010 x 3.78541
= 7608.6741 L
In other words, the coffee cup with the record size will hold a maximum of 7608.6741 L of coffee while a normal coffee cup will only hold 237 mL. The problem now is the number of number coffee cups that will fill the world's record largest coffee.
7608.6741/237 = 32.10
Therefore, the number of normal coffee cups that would be required to fill the enormous coffee cup would be approximately 32 cups.
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I’ve tried to do the problem but it’s confusing
Answer:
Explanation:
The equation for calculating the amount of heat released is:
q = mcΔT
where:
q = heat released (in joules)
m = mass of the substance (in grams)
c = specific heat capacity (in J/g·°C)
ΔT = change in temperature (in degrees Celsius)
Given:
m = 30 g
ΔT = 96°C - 25°C = 71°C
c = 4.184 J/g·°C (for water)
so
q = (30 g)(4.184 J/g·°C)(71°C) = 8.91*71 = 635.11 J
Therefore, 635.11 J of heat is released when 30g of water cools down from 96 degree celsius to 25 degree celsius
Note that this calculation is valid only if the process is adiabatic or no heat is exchanged with the environment.
Ethylene burns in oxygen to form carbon dioxide and water vapor:
C2H4(g) + 3 02(g) --> 2 CO2(g) + 2 H2O(g)
How many liters of water can be formed if 1. 25 liters of ethylene at 1. 00 atm and 298K are
consumed in this reaction?
67.0L of H₂O can be formed if 1. 25 liters of ethylene at 1. 00 atm and 298K are consumed in this reaction.
What do you mean by mole?A mole is know to be the unit used in chemistry to measure the amount of a substance. It is defined as the amount of matter that contains as many atoms, molecules, or other particles as there are in 12 grams of carbon-12. Moles are a convenient way to measure large numbers of very small particles such as atoms, molecules, ions and electrons.
The molar volume of gas at 1.00 atm and 298 K is 22.41 L/mol.
Given that
2 moles of water are produced from 1 mole of ethylene,
The number of liters of water produced can be calculated with the following formula:
1.25 L C₂H₄ x (2 mol H₂O / 1 mol C₂H₄) x (22.41 L H₂O / 1 mol H₂O)
= 67.0 l H₂O
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A gas mixture containing oxygen, nitrogen, and He has a total pressure of 189.9 kPa. If PO2 = 104.6 kPa and PN2 = 13.0 kPa, what is PHe ?
A gas mixture containing oxygen, nitrogen, and He has a total pressure of 189.9 kPa. If PO2 = 104.6 kPa and PN2 = 13.0 kPa, PHe is 72.3 kPa.
What is total pressure ?Static pressure and velocity pressure are added to create total pressure. There is static pressure in a fluid that is not flowing. The pressure required to accelerate air from a zero velocity to a specific velocity that is proportional to the kinetic energy of the air stream is known as velocity pressure.
Consider the friction that exists between a fluid and the interior surface of a pipe. The fluid's density and velocity are used to compute the dynamic pressure: the total pressure in a mixture of ideal gases is the total of the partial pressures of the individual gases.
Total pressure = PO2 + PN2 + PHe
189.9 kPa = 104.6 kPa + 13.0 kPa + PHe
PHe = 72.3 kPa
Thus, A gas mixture containing oxygen, nitrogen, and He has a total pressure of 189.9 kPa. If PO2 = 104.6 kPa and PN2 = 13.0 kPa,PHe is 72.3 kPa.
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A 25.0 mL sample of a saturated Ca(OH)2 solution is titrated with 0.028 M HCl, and the equivalence point is reached after 38.1 mL of titrant are dispensed. Based on this data, what is the concentration (M) of the hydroxide ion
The concentration of hydroxide ions in the solution is 0.0428 M.
Ions are what?A molecule or atom that has a net electrical charge is called an ion.
The balanced equation for the reaction between HCl and Ca(OH)2 is:
Ca(OH)2 + 2HCl -> CaCl2 + 2H2O
The number of moles of HCl added at the equivalence point can be found by multiplying the volume of HCl added (in liters) by its concentration in moles/liter:
moles HCl = (38.1 mL HCl x 0.028 mol/L HCl) / 1000 mL/L = 0.00107 mol HCl
The concentration of hydroxide ions can be found by dividing the number of moles of hydroxide ions by the volume of the solution:
[OH-] = moles OH- / L of solution
We know that the number of moles of HCl added is equal to the number of moles of OH- present, so:
[OH-] = 0.00107 mol OH- / (25.0 mL / 1000 mL/L) = 0.0428 M
Therefore, the concentration of hydroxide ions in the solution is 0.0428 M.
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The down-slope movement of material on Earth is called a slope failure. It is the failure of the slope resulting in transport of debris downhill by
sliding, rolling, falling, or slumping. This is an example of slope failure called
To solve this we must be knowing each and every concept related to landslides. Therefore, the given process describe the landslides process.
What is landslides?Slope collapses are essentially natural calamities that occur in a variety of locations across the world. Slope failures, often known as landslides, define a wide range of mechanisms that produce the outward or downward of slope-forming materials such as rock, soil, or landfills.
The down-slope movement of material on Earth is called a slope failure. It is the failure of the slope resulting in transport of debris downhill by sliding, rolling, falling, or slumping. This is an example of slope failure called landslides.
Therefore, the given process describe the landslides process.
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Liquid hexane CH3CH24CH3 will react with gaseous oxygen O2 to produce gaseous carbon dioxide CO2 and gaseous water H2O. Suppose 7.76 g of hexane is mixed with 34. g of oxygen. Calculate the minimum mass of hexane that could be left over by the chemical reaction. Round your answer to 2 significant digits.
the minimum mass of hexane that could be left over by the chemical reaction is 17.2 grams of.
Hexane, a non-polar solvent having a boiling point of 68 degrees Celsius, is the one used to extract the oil from rice bran to produce rice bran oil (RBO). The International System of Units uses the mole (symbol: mol) as the unit of material quantity. How many elementary entities of a particular substance are present in an object or sample is determined by the quantity of that material.
Hexane moles equal 29/86=0.34
41.3/32 = 1.30 moles of oxygen
One mole of hexane takes 9.5 moles of oxygen, as shown by the reaction.
In this case, oxygen is the limiting reagent.
Consumption of moles of hexane is 1.30/9=0.144
Hexane remaining in moles is equal to 0.20 to 0.34 moles.
Hexane mass remaining = 0.2*86=17.2 grams.
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A sample of an unknown gas at STP has a density of 0.630 grams per liter. What is the gram molecular mass of this gas?
Density is an intensive property as it does not depend on the quantity of the substances Whereas mass and volume are extensive property. Therefore, 0.630 is the gram molecular mass of this gas.
What is density?Density tells about the compactness of the substances, how much dense is the substances in other words. Object that is more denser than water they just sink in the water.
Mathematically,
Density = Mass of the gas ÷volume marked on the graduated cylinder
density= 0.630 grams per liter
means 0.630 grams of an unknown gas is present in 1 liter of solution
Therefore, 0.630 is the gram molecular mass of this gas.
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The measured electric mobilities of K+ (aq) and Cl– (aq) at a KCl concentration of 0.30 mol L–1 are respectively, 5.9 10 –4 and 6.14 10–4 cm2 V–1 s–1 at 30 OC. Calculate the transport numbers and molar ionic conductivity of K+ and Cl–. What is the molar conductivity of KCl at this concentration? Assume complete ionisation of KCl.
The molar conductivity of KCl at this concentration and transport numbers and molar ionic conductivity of K+ and Cl– are
Λm =1.806×10−4 t(K+)=4.90033223×10^−9 t(Cl-) =5.09966777×10^−9What is the molar conductivity of KCl at this concentration?Generally, The transport number, t, of an ion can be calculated using the equation: t = (μi x Ci) / Λm,
where
tμi is the electric mobility of the ion, Ci is the concentration of the ion, and Λm ishe molar conductivity of the electrolyte solution.Given that the electric mobility of
K+ is 5.9 x 10^-4 cm^2 V^-1 s^-1, the electric mobility of Cl- is 6.14 x 10^-4 cm^2 V^-1 s^-1, and the concentration of KCl is 0.30 mol L^-1, we can calculate the transport numbers as:
t(K+) = (5.9 x 10^-4 cm^2 V^-1 s^-1 x [K+]) / Λm t(Cl-)
= (6.14 x 10^-4 cm^2 V^-1 s^-1 x [Cl-]) / Λm
where
[K+] and [Cl-] are the molar concentrations of K+ and Cl- ions, respectively.
The molar ionic conductivity, Λi, of an ion can be calculated using the equation: Λi = μi x Ci,
where
μi is the electric mobility of the ion and Ci is the concentration of the ion.Given that the electric mobility of K+ is 5.9 x 10^-4 cm^2 V^-1 s^-1 and the concentration of K+ is 0.15 mol L^-1, the molar ionic conductivity of K+ is:
Λ(K+) = 5.9 x 10^-4 cm^2 V^-1 s^-1 x 0.15 mol L^-1
Λ(K+) =8.85×10−5
Similarly, given that the electric mobility of
Cl- is 6.14 x 10^-4 cm^2 V^-1 s^-1 and the concentration of Cl- is 0.15 mol L^-1, the molar ionic conductivity of Cl- is:
Λ(Cl-) = 6.14 x 10^-4 cm^2 V^-1 s^-1 x 0.15 mol L^-1
Λ(Cl-) =9.21×10^−5
Finally, the molar conductivity of KCl can be calculated as:
Λm = Λ(K+) + Λ(Cl-)
=9.21×10^−5+8.85×10^−5
Λm =1.806×10−4
The transport numbers of K+ and Cl- can be calculated by
t(K+) = Λ(K+) / Λm and
t(Cl-) = Λ(Cl-) / Λm respectively.
t(K+) = 8.85×10−5/1.806×10−4 '
t(K+)=4.90033223×10^−9
and
t(Cl-) =9.21×10^−5/1.806×10−4
t(Cl-) =5.09966777×10^−9
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Exercise 3.1 Evaporation
In this exercise, you will think about what evaporation is and how it happens.
1 Complete these sentences. Choose the correct word when there
is a choice.
Evaporation occurs when a
turn into a
The particles in the liquid
turns into a
gain/lose
and move faster/slower and closer
together/further apart until some of them escape from the surface and
become a
Evaporation occurs when a liquid turns into vapour . The particles in the liquid gain energy and move faster and further until some of them escape from the surface and become a vapour
What is Evaporation ?A type of vaporisation called evaporation takes place on the surface of a liquid as it transitions into the gas phase. When humidity impacts the rate of evaporation of water, for example, a high concentration of the evaporating substance in the surrounding gas considerably slows down evaporation.A liquid transforms into a gas during evaporation. It is simple to picture when puddles of rain "vanish" on a hot day or when wet clothing dries in the sun. In these instances, the liquid water is evaporating into a gas known as water vapour rather than really dissipating. Global evaporation takes place.Evaporation occurs on surfaces. The top layer of the liquid evaporates because the molecules with the highest kinetic energy escape into the air, causing it to become lighter.
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Convert the following numbers into the standard form of scientific notation 0. 010x 10e5
The standard form of scientific notation for 0. 010x 10e5 is 1.0 × 10^3.
Scientific notation is a form of presenting large numbers or very small numbers in a simpler form.
There are some rules to write scientific notation:
The base should be always 10. The exponent must be a non-zero integer.
Absolute value of the coefficient should be greater than or equal to 1 but it should be less than 10.The mantissa carries the rest of the significant digits of the number.
The power of 10 will be positive, if the given number is multiples of 10 then the decimal point has to move to the left. The power of 10 will be negative If the given number is smaller than 1 and then the decimal point has to move to the right.
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What causes pressure inside a helium balloon?
OA. The helium atoms exert an electrostatic force that pushes the
surface outward.
OB. The helium atoms expand and press on the surface of the balloon.
OC. The helium atoms bounce off the surface as they move inside the
balloon.
OD. The helium atoms stick to the surface of the balloon and increase
its weight.
Pressure inside a helium balloon: The helium atoms expand and press on the surface of the balloon.
What is helium balloon?Helium balloons are a type of balloon filled with helium gas. Helium is a light, non-flammable, inert gas that is found in abundance in the atmosphere and is used to inflate balloons. Helium balloons are often used in decorations, promotions, special events, parties, and displays. They come in a variety of shapes, sizes, and colors, and can be filled with helium and released into the atmosphere, creating a festive atmosphere. Helium balloons are also used in scientific experiments, such as measuring wind speeds, studying atmospheric pressure and air movement, and measuring the temperature of the atmosphere.
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How many mole is 1g?
One gram of a chemical is equivalent to one mole.
A physical characteristic called the molar mass is calculated by dividing the mass of a given substance by the substance's volume. The standard relative atomic mass of an element is multiplied by the molar mass constant, 1 × 10⁻³ kg/mol = 1 g/mol, to determine the molar mass of its atoms. A compound's molar mass is calculated by adding the standard atomic weights of the constituent atoms and multiplying the result by the molar mass constant.
One atom or molecule has the same mass in grams as one mole of a substance does in atomic mass units.
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Substances that can be dissolved in water are Group of answer choices rare. soluble. thermal. molecular.
The temperature inside a pressure cooker is 117°C. Calculate the vapor pressure of water inside the pressure cooker. What would be the temperature inside the pressure cooker if the vapor pressure of water was 2.85 atm?
The vapor pressure of water at its boiling point 100°C is 1 atm. Then the pressure at 117°C is 1.17 atm and the temperature of water at a pressure of 2.85 atm is 285°C.
What is boiling point ?Boiling point of a substance is the temperature at which it converts from liquid state to vapor state. At this temperature the vapor pressure of water vapor is equal to the atmospheric pressure that is 1 atm .
The temperature-pressure relation is written as:
P1 /T1 = P2/ T2
Now, the pressure inside the cooker at a temperature of 117°C is calculated as:
(1 atm × 117 °C) / 100 °C = 1.17 atm.
Thus, pressure at 117 °C is 1.17 atm. Then, If the pressure is 2.85 atm, then the temperature of water inside the pressure cooker is calculated as:
(2.85 atm × 117 °C) / 1.17 = 285 °C
Therefore, the temperature at 2.85 atm is 285 °C.
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Which is the best way to prepare 3-methoxypentane via the Williamson method? ( please explain why)
A). CH3OH + CH3CH2CHOHCH2CH3 + H2SO4, 140'C
B). CH3OH + (CH3)2 CHCH2CH2OH+ H2SO4, 140' C
C). CH3ONa + (CH3CH2)2CHBr
D). CH3 I + (CH3CH2)2CHONa
The best way to prepare 3-methoxypentane via the Williamson method is : D). CH3 I + (CH3CH2)2CHONa.
What is Williamson method?The most used technique for making ethers is the Williamson ether synthesis. A metal alkoxide displaces a halide ion from an alkyl halide in an SN2 reaction, which is how it happens. An alcohol and a potent base, such as sodium hydride, react to form the alkoxide ion.
Williamson synthesis is employed in the creation of both simple and mixed ethers. Alcoholic sodium or potassium alkoxide is heated with alkyl halide to create the appropriate ethers. ROR+NaX ROR+ONa+X. Methyl iodide produces dimethyl ether when heated in the presence of alcoholic sodium methoxide.
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What molecule solid would have the highest melting point?
Answer:
Explanation:
They are Covalent networks solids
If methane (CH4) has a tetrahedral molecular geometry, which of the following diagrams most likely represents its Lewis dot structure
The carbon atom is in the center of the structure and is surrounded by four hydrogen atoms.
What is structure?Structure is an organized arrangement of elements, such as components, materials, people, or ideas. It is a way of organizing and arranging the components of a system in order to achieve a desired outcome.
The most likely Lewis dot structure for methane (CH4) is the following:
The carbon atom is in the center of the structure and is surrounded by four hydrogen atoms. Each hydrogen atom has one electron in its outer shell, and the carbon atom has four electrons in its outer shell. All of the atoms are arranged in a tetrahedral shape, which matches the molecular geometry of methane.
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A 70g chunk of metal at 180C was dropped in a bucket containing 400g of water at 25C. The final temperature of the mixture was 28C. What is the specific heat capacity of the metal
Thus, the metal has a mhm specific heat capacity of 2.472 Joel program degrees Celsius.
To calculate the temperature change (T), subtract the end temperature from the initial temperature. Multiply the temperature change by the sample's mass. Share the product's energy and heat output. The equation is C = Q / (T m). The amount of heat energy per unit mass needed to raise the temperature by one degree Celsius is known as the specific heat. The form given below, where c is the specific heat, is typically used to express the relationship between heat and temperature change. Let S represent the water's specific heat capacity. Consequently, the combined temperature of 50g of water at 20°C and 50g of water.
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What is called proton number?
Proton number is called atomic number.
The chemical element's atomic number, also referred to as the nuclear charge number, is determined by the charge number of an atomic nucleus. This is the quantity of protons in the nucleus of each of that element's atoms. The atomic number refers to the number of protons in the nucleus of an atom. The amount of protons in an element determines what kind of element it is.
Both protons and electrons are equal in number in a neutral atom. The mass of an atom, represented by the letter M, is equal to the total of its protons and neutrons in the nucleus.
The number of protons in the atom's nucleus is therefore equal to the atomic number (Z). in an uncharged atom.
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Why does c14 have 8 neutrons?
C14 have 8 neutrons, because C have 6 atomic number and it have 14 atomic mas , where atomic mass is total of proton and neutron so the neutron of C14 is 8.
It is commonly known that Carbon-14 is an isotope of carbon. It is also known as a neutral atom. Additionally, the ratio of neutrons to protons varies among different isotopes.
The total number of protons that make up an atom's nucleus is represented by the atomic number of that atom, as is well known. We know that carbon has an atomic number of 6, a mass number of 14. It is common knowledge that mass is the product of protons and neutrons. There will thus be = 14 - 6 = 8 neutrons.
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How many moles are there in 10g?
Answer:
0.25 moles
Explanation:
What is the molecular formula of a compound whose empirical formula is CH4 and has a molar mass is 32. 086 g/mole?
The molecular formula of a compound whose empirical formula is CH4 and has a molar mass is 32. 086 g/mole is C
The molecular formula of a compound is the actual number and types of atoms that make up a molecule. It gives the exact number of atoms of each element in a molecule.
On the other hand, the empirical formula of a compound represents the simplest whole number ratio of atoms that make up a compound. It gives the lowest whole number ratio of atoms of each element in a molecule.
Multiply the subscripts in the empirical formula by a factor needed to reach the molar mass of the compound. In this case, CH4 has a molar mass of 16.04 g/mol and the compound has a molar mass of 32.086 g/mol.
32.086 g/mol/16.04 = 2
Multiplying the subscripts by 2, the molecular formula of the compound is C2H8.
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15) Lidocaine 2 gm/500 mL D5W is ordered to run at 3.5 mg/min. At what rate should the IV pump be set
Ordered to run at 3.5 mg/min is a dose of lidocaine 2 g/500 mL D5W. The IV pump should be set at a rate of 52.5 mL per hour.
Given 1mg/min = 60mg/hour
Then 3.5 mg/min = 3.5 x 60 mg/hour = 210mg/hour
Lidocaine is 2gm/500mL = 2000mg/500mL
If you only need to calculate the infusion rate, or the amount of medication to infuse per hour, you can do it by taking the entire volume in mL and dividing it by the total number of hours the medication is supposed to be infused over. This will give you the rate in mL per hour.
Then the flow of rate = 210mg/hour / 2000mg/500mL = 210x500/2000 = 52.5mL/hour.
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name a solid that when burnt colourless gases are formed.One gas is strongly acidic while the other is slightly basic
Sulfur is a solid that when burnt produces two colourless gases: sulfur dioxide (SO2) and sulfur trioxide (SO3). The gas SO2 is strongly acidic, while the gas SO3 is slightly basic. When SO3 is dissolved in water, it forms a solution called sulfuric acid, which is a strong acid. SO2 is also a corrosive gas that can be harmful to humans and the environment. It is often produced as a byproduct of industrial processes, such as the burning of fossil fuels and the production of sulfuric acid.
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How many times more acidic is a solution with a pH of 2 compared with one with a pH of 5 Explain.
Using a logarithmic scale with 7 as neutral, lower values are more acidic and higher values are more alkaline, the acidity or alkalinity of a solution is expressed. where c is the number of moles of hydrogen ions present per litre. So pH 2 is 1000 times stronger than pH 5, and vice versa.
A pH of 2 is how much more acidic than a pH of 5.For instance, a pH of 2 is 10,000 times more acidic than a pH of 3 and a pH of 5 is 10,000 times more acidic. Ten times as alkaline as a pH of 10 is a pH of 11.
How many times more acidic is a pH 2 solution compared to a pH 9 solution?Each whole pH value is ten times more acidic than the next higher value since the pH scale is logarithmic.
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How many moles of hydrogen (H2) are required to completely reduce 1 mole of cis-2,3,3- trimethylhepta-1,5-diene
2 moles of hydrogen (H2) are required to completely reduce 1 mole of cis-2,3,3- trimethylhepta-1,5-diene (C11H16).
What is moles?Moles, in chemistry, is a unit of measurement used to express the amount of a substance. It is equal to 6.022 x 1023 atoms, molecules, ions, or other particles. In other words, a mole contains an exact number of particles, which is known as Avogadro's number. The mole is a convenient way to measure and compare large amounts of a substance. It is also used to measure the amount of energy released or absorbed in a chemical reaction.
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What is a neutral atom and has 14 protons?
A neutral atom and has 14 protons is Silicon
Each of the elements in the Periodic Table has an individual atomic number, or a specific number of protons in its nucleus.
The total number of protons that make up an atom's nucleus is represented by the atomic number of that atom, as is well known. We know that an atom has proton of 14, so the atomic number of that neutral atom is 14. we can check on the periodic table an atom that have 14 atomic number is silicon.
Therefore, the neutral atom and has 14 protons is Silicon
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