The new chemical formula is [tex] Fe(OH)_{3}[/tex] or ferric hydroxide.
Ion [tex] {Fe}^{3 + } [/tex] will react with NaOH while [tex] {Ni}^{2 + } [/tex] will not. The chemical reaction is as follows -
Chemical reaction stating reaction between [tex] {Fe}^{3 + } [/tex] and NaOH.
[tex] {Fe}^{3 + } [/tex] + NaOH → [tex] Fe(OH)_{3}[/tex] + Na
In the reaction, [tex] {Fe}^{3 + } [/tex] represents ferric ions, NaOH is the chemical formula of sodium hydroxide, [tex] Fe(OH)_{3}[/tex] is the chemical formula of ferric hydroxide and Na represents sodium. The ferric hydroxide precipitates as reddish brown. It does not dissolve in excess is sodium hydroxide.
Chemical reaction stating reaction between [tex] {Ni}^{2 + } [/tex] and NaOH
Nickel does not react with sodium hydroxide due to its basic nature. The reason can be owed to electron donating characteristic of both the metal and base.
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At 7 a.m., the science classroom had a temperature of 68 F. By 3 p.m.,
the temperature had increased to 75 F. Calculate the rate of temperature
change from 7 a.m. to 3 p.m
The rate of temperature is the ratio of temperature difference to the difference in time. The rate of temperature for a change of 68 F to 75 F from 7 am to 3 pm is 0.625 F/hr.
What is temperature rate?Temperature is the measure of overall heat of a body or a region. Temperature level of a body or a place vary according to the time and some other factors such as pressure, seasonal changes such as rain, wind etc.
At morning to afternoon time the rate of temperature will be higher and to evening there might occur a slight decline.
Given that the time changes from 7 am to 3 pm thus, rate of time is 8 hrs. Then the temperature changes from, 68 faraday to 75 faraday thus the difference in temperature is 75-68= 5 faraday.
Now, the rate of temperature is calculated by taking the ratio of change in temperature to the change in time as follows:
(5 Faraday) / 8 hrs. = 0.625 F/hr.
Therefore, the rate of temperature change is 0.625 F/hr.
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ELEMENT #3
The radius of my most common ion is larger than my atomic radius.
I have 6 valence electrons.
I have a higher first ionization energy than tellurium.
I am the smallest atom in my group.
What element am I? Write my symbol and standard electron configuration.
*dont have to give me the electron configuration i can find it
whats the phycical property of water
Answer:
The answer is color, temperature, turbidity, taste, and odor.
5. If a solution has a pOH of 2.5 what is its [OH
] concentration.
Answer:
3.2 x 10-3 3.2 x 10-12 3.2 x 10-2 11.5
Explanation:
You have a solution that contains 100 ml of 1. 5 m potassium carbonate and another 100 ml solution that contains 1. 0 m fecl2 and 2. 0 m nabr. When you mix the two solutions together to form a precipitate. What is the precipitate and how much is formed assuming the insoluble product precipitates completely?.
Answer:
235
Explanation:
A 1.25M solution of copper(III) sulfate is made with 670mL. How many grams of solute are required?
Molarity :
The number of moles of solute per liter of solution is known as molarity or molar concentration. It is used to express the concentration of a given solute in a solution.
It can be calculated using the formula, Molarity = [tex]\frac{number-of- moles-of-solute}{Volume-of-the-solution-in-liters}[/tex]
Given data:
Molarity of the solute, copper(III) sulfate = 1.25 M
Volume of the solution = 670 mL = 0.67 Liters
Then, Molar mass of the solute, = 415.2 g/mol
Then, number of moles of solute = Molarity x Volume of solution
= 1.25 x 0.67 = 0.8375 moles.
Then, Mass of the solute
= Molar mass of solute x number of moles of solute
= 415.2 g/mol x 0.8375 mol = 347.73 g.
Therefore, the mass of solute in grams required are = 347.73 g
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If the acetic acid being titrated here were replaced by hydrochloric acid, would the amount of base needed to reach the equivalence point change?.
yes, the equivalence point would change as acetic acid is a weak acid and dissociates partially but hydrochloric acid is a strong acid and dissociates completely.
Between equivalence and endpoint, what is the difference?Equivalence and endpoint differ primarily in that the former refers to the point at which a chemical reaction ends and the latter, to the time at which a system's color changes.
Define equivalence point.When enough titrant has been administered to entirely neutralize the analyte solution in a titration, this is known as the equivalence point. The titrant (standard solution) has a molecular weight that is equal to the moles of the solution with the unknown concentration.
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How did the Bronsted-Lowry acid-base theory clarify what Svante Arrhenius was not able to explain in his theory of acids and bases regarding ammonia?
The Bronsted-Lowry acid-base theory clarifies what Svante Arrhenius were not able to explain in their theory of acids and bases regarding ammonia as -
Svante Arrhenius theory states that -
In order for a substance to release H⁺ or OH⁻ ions, it must contain that very ion. But, this does not explain the weak base ammonia NH₃.
In Bronsted-Lowry acid-base theory -
Acids are the proton donating group while bases are the proton accepting group.
Ammonia is a nitrogen and hydrogen inorganic compound. Ammonia is a gas which is colourles, it is strong, and has a pungent smell. Its chemical formula is NH₃.
Ammonia is a stable binary hydride. It is the most basic nitrogen hydride. It is a typical nitrogenous waste, specifically among aquatic organisms. It contributes to the nutritional requirements of terrestrial organisms. It acts as a forerunner to 45 percent of the food and fertilizers all over the world.
70% of ammonia with urea and di-ammonium phosphate, is used to create fertilizers. It is available in a variety of shapes and compositions. The pure ammonia is spread onto the ground.
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aqueous lithium hydroxide solution is used to purify air (remove co2) in spacecrafts and submarines. the pressure of carbon dioxide in a cabin having a volume of 2.4 x105 l is 7.9 x 10-3 atm at 39oc. eventually the pressure of co2 is reduced to 1.2 x 10-4 atm. how many grams of water are formed by this process? the ideal gas law and stoichiometry chp. 5.5 2lioh(aq) co2(g) à li2co3(aq) h2o(l)
The mass of the water is 1580 g.
What is the amount of water formed?We know that the ideal gas equation can be used to obtain the number of moles of the gas. We have been told that the pressure of the gas reduced from 7.9 x 10-3 atm to 1.2 x 10-4 atm. The change in pressure can be used obtain the number of moles.
Change in pressure = 7.9 x 10-3 - 1.2 x 10-4 = 7.78 * 10^-3 atm
Using;
PV = nRT
n = PV/RT
n = 7.78 * 10^-3 atm * 2.4 x10^5 l/0.082 * (39 + 273)
n = 85 moles
Since 1 mole of carbon dioxide produces 1 mole of water
85 moles of carbon dioxide produces 85 mole of water
Mass of water produced = 85 mole * 18 g/mol
= 1580 g
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A student measured the string as 2.43 m long. The teacher said it was actually 2.12 m long.
What was the student's percent error?
7. This question is about calculating the area.
A nanoparticle is in the shape of a cuboid.
Calculate its surface area to volume ratio.
Show working.
a
a = 80 nm
b = 15mm
c = 20nm
C
Surface area to volume ratio:
When calcium reacts with chlorine to form an ionic compound, each metal atom loses electron(s) and each nonmetal atom gains electron(s). there must be calcium atom(s) for every chlorine atom(s) in the reaction.
When calcium reacts with chlorine, each calcium atom loses 2 electrons, and each chlorine atom gains 2 electrons. There must be one 1 calcium atom for every 2 chlorine atoms in the reaction.
When atoms react, they either lose or gain electron. Atoms do this in order to attain the stable noble gas configuration. Metals are more likely to lose electrons, and non-metals are more likely to gain electrons. Calcium has an atomic number of 20, and its electronic configuration is:
[Ca] = 1s²2s²2p⁶3s²3p⁶4s²
The easiest way for calcium to obtain a stable noble gas configuration is to lose 2 of its electrons, so that it has 18 electrons left. When this happens, calcium becomes a positively charged cation:
Ca ⇒ Ca²⁺ + 2e⁻
Chlorine has 17 electrons with the electronic configuration:
[Cl] = 1s²2s²2p⁶3s²3p⁵
This shows that chlorine only needs one electron to have the stable noble gas configuration. When this happens, chlorine becomes a negatively charged anion:
Cl + 1e⁻ ⇒ Cl⁻
Thus, for calcium to completely react with chlorine, there must be two atoms of chlorine for each carbon atom. This is because calcium loses two electrons, and each chlorine atom only accepts one. Hence:
Ca²⁺ + 2CL⁻ ⇒ CaCl₂
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Complete each statement by writing the correct term or phrase from the list below
in the space provided.
abiotic factors
biotic factors
Interdependence
conformers
ecology
ecosystem
community
acclimation
1. Organisms that do not regulate their internal conditions to the environment are
habitat
herbivore
Osprey
2. An organism's change in response to a change in the organism's
environment
3. A(n)
aspects of its habitat, such as the soil, water, and weather.
4. The living organisms in a habitat are called
consists of a community and all the physical
5. 98% of this birds diet is fish
6. The dependence of every organism on its connections with other living and
nonliving parts of its environment
7. The many different species that live together in a habitat are called a(n)
8. The study of the interactions of living organisms with one another and with
their environment is called
9. Organisms that eat producers are called
10. The physical aspects of a habitat are called
11. The place where a particular population of a species lives is called its
Each statment correct phrase is completed.
1- Conformers are organisms that do not regulate their internal condition to the environment that habitat.
2- A change is an organisms surrounding that causes the organisms to react is called a stimulus.
3- soil,water and weather are abiotic factors of habitat.
4-An ecosystem consist of all the living organisms in an area.
6- ecology is the study of how organisms interact with one another and with their physical environment.
7-The many different species live together in a habitat are called a community.
8-ecology is the study of organisms and how they interact with the environment around them.
9-organisms that eat producers are called primary consumer.
10-The physical aspects of habitat are called abiotic factors.
11-A place where paticular population of species lives is called it's habitat.
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Argon is one of the six noble gases, a group of elements that are known to be nonreactive. Explain why Noble Gases such as argon are nonreactive. Provide evidence from the model you drew in Question 1 to support your response.
The noble gases are known to be nonreactive because they have an already filled outer electron shell.
What are noble gases?The noble gases is defined as those elements that are located at the group 8 of the periodic table which are also called inert gases.
Examples of six noble gases include the following:
Helium (He), Neon (Ne),Argon (Ar),Krypton (Kr),Xenon (Xe), and Radon (Rn).The features of noble gases include the following:
They are odorless gases.They are non-flammable gases.Their melting and boiling points are close together giving them a very narrow liquid range.They are colourless gases. They are monoatomic gases with low chemical reactivity; andThe noble gases are called inert gases because they are non reactive gases.The noble gases are non reactive because the outer atomic shells of these gases are filled up that is to say that they have a full Valence electron shell.
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Claim-evidence-reasoning: populations of organisms that reproduce asexually tend to show less variation from one individual to another. why might this be? make a claim and use your scientific reasoning skills to support your claim. cer claim: evidence: reasoning
Asexual reproduction prevents genetic variation within a species since it ensures that all offspring have an identical copy of the parent's DNA unless a mutation arises in the duplicate DNA that is produced.
Why is there no diversity in reproduction from a single parent?Sexual and asexual reproduction are the two options. In sexual reproduction, there are two parents. However, only one parent is engaged in asexual reproduction. In this, offspring of a single parent are genetically identical to the parent. Offspring are physically and genetically similar to their parents. They are a clone or exact replica of the parent. Asexual reproduction doesn't involve any genetic material being recombined.
Thus, the person created by asexual reproduction does not exhibit variety or genetic variability.
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experimentally, it is found that 3.4 moles of a molecule in gaseous form requires the addition of 454 j of energy at constant volume in order to raise its temperature by 8.4 k. calculate the molar heat capacity at constant volume for this gas.
The molar heat capacity at a constant volume for this gas is 15.90 J/(K⋅mol) if 3.4 moles of this gas require 454 j of energy to raise its temperature by 8.4 k.
The molar heat capacity can be calculated by using the formula;
molar heat capacity = C / n
where C represents the heat capacity
n represents moles
The heat capacity of this gas can be calculated as follows;
heat capacity = E / T
here, E represents the amount of heat energy supplied
T represents the change in temperature
Substituting the given values in the heat capacity formula;
heat capacity = 454 / 8.4
heat capacity = 54.05
Now we substitute this calculated value of heat capacity in the formula of molar heat capacity;
molar heat capacity = C / n
molar heat capacity = 54.05 / 3.4
molar heat capacity = 15.90
Therefore, the molar heat capacity for this gas at constant volume is calculated to be 15.90 J/(K⋅mol).
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if the pressure is decreasing at a rate of 50 kg/m2, the temperature is increasing at a rate of 7.2 k/s, and the amount of gas (i.e., the number of moles) remains the same, what is the rate of change of the volume?
The rate of change of the volume is 0.144 m³/s.
The average temperature of the air is indicated via a properly exposed thermometer at some point in a given term, usually an afternoon, a month, or a yr. For climatological tables, the mean temperature is generally calculated for each month and for the 12 months. Temperature is an amount that determines the course of the float of warmth on preserving two bodies at one-of-a-kind temperatures in contact. Its SI unit is kelvin (k).
The heat of an object is the total power of all the molecular movement interior that object. Temperature is the measure of the thermal power or average warmness of the molecules in a substance. SI Unit. Joule.
rate of change of pressure = 50 kg/m²
temperature = 7.2 K/s
Using ideal gas equation PV = nRT
since nR is constant
V = T/P
= 7.2/50
= 0.144 m³
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several properties of water are shown classify the ones that are phycical propertys
and the chemical propertys
Water's physical characteristics include its liquid state at ambient temperature and density of 1.0 g/cm3. Water has the ability to divide into hydrogen and oxygen and react with some metals, among other chemical features.
Phycical and Chemical PropertysA substance's physical property is a quality that can be seen or quantified without affecting the substance's identity. Color, density, hardness, and melting and boiling points are examples of physical qualities. The capacity of a substance to go through a particular chemical transition is described by its chemical property. An attribute of a specific material that can be seen in a chemical reaction is called a chemical property. Major chemical characteristics include chemical stability, flammability, toxicity, heat of combustion, pH value, and rates of radioactive decay.To learn more about Phycical and Chemical Propertys refer:
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i am pouring concentrated sulfuric acid from a 1-gallon container. i need to use the following ppe for protection against potential splash of a corrosive liquid.
Personal protective equipments to be worn while handling corrosive liquids are safety goggles, hand gloves and closed toed shoes.
What are personal protective equipments ?Personal protective equipment is a protective clothing which is worn to protect the wearer's body from hazard or injury.The hazards which can be addressed by the use of personal protective equipment are physical,chemical and bio hazards.
It imposes a barrier between the user and the working environment.The main purpose of personal protective equipment is to reduce exposure of employees to the hazards.
It has a limitation that it does not eliminate the hazard and may lead to harm to the employee if the equipment is damaged.
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1. Consider the generic reaction:A + 2BC AH = -55 kJDetermine the amount of heat emitted when each amountof reactant completely reacts (assume that there is morethan enough of the other reactant).(a) 1 mol A(b) 2 mol A(c) 1 mol B(d) 2 mol B
Answer:
(a) 55 kJ of heat are released when 1 mol of reactant A is used;
(b) 110 kJ of heat are released when 2 moles of reactant A are used;
(c) 27.5 kJ of heat are released when 1 mol of reactant B is used;
(d) 55 kJ of heat are released when 2 moles of reactant B are used.
Explanation:
The question requires us to determine the amount of heat released when the given amounts of reactants are used, considering the following balanced chemical equation:
[tex]A+2B\rightarrow C\text{ }\Delta H=-55kJ[/tex]When the enthalpy change for a reaction (or heat of reaction, ΔH) is given in units of energy, such as kilojoules (kJ), and not units of energy per mol (such as kJ/mol), we can consider that ΔH corresponds to the heat absorbed or released for the molar quantities of reactants as given in the balanced chemical equation. In the case given by the question, for example, we can say that 55 kJ of energy are released when 1 mol of A reacts with 2 moles of B.
Therefore, we can use the molar quantitites from the balanced chemical equation as a reference to determine the amount of heat released when different amounts of reactants are used.
Considering the information above, we can calculate:
(a) heat released when 1 mol of A reacts:
Note that 1 mol of A corresponds to the amount of reactant A given by the balanced chemical equation. Therefore, 55kJ of energy are released when 1 mol of A is used.
(b) heat released when 2 moles of A reacts:
Note that 2 moles of A corresponds to the double of the amount of reactant A given by the balanced chemical equation. Thus, we must multply ΔH by 2: 55 kJ x 2 = 110 kJ of energy are released when 2 moles of A are used.
(c) heat released when 1 mol of B reacts:
Note that 1 mol of B corresponds to half of the amount of reactant B given by the balanced chemical equation. Thus, we must divide ΔH by 2: 55 kJ / 2 = 27.5 kJ of energy are released when 1 mol of B is used.
(d) heat released when 2 moles of B reacts:
Note that 2 moles of B corresponds to the amount of reactant B as given by the balanced chemical equation. Therefore, 55 kJ of energy are released when 2 moles of B are used.
Which of these is a measure of the average kinetic energy of the molecules
of a material?
O Option 1
O temperature
O thermal energy
O bonding energy
The measure of average kinetic energy of molecules is called tempreture.
What is kinetic energy ?
kinetic energy is a form of energy that an particle has by reason of it's motion.
If we want to accelerate an object then we must apply a force .
The average of all kinetic energy the molecule assumed to be directly proportional to the absolute tempreture of the gas.
The Kelvin tempreture of a substance is directly proportional to the average kinetic energy of the particles of the substance.
This is the reason why measure of the average kinetic energy of the molecule of a material called tempreture.
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An atom of Gold contains 120 neutrons. What is its mass number?
Answer:
199
Explanation:
Au has atomic number of 79
so mass number = 79 + 120 = 199
Someone help me with this please
A scientist sets up an experiment as follows: she puts bromine gas in a flask that is attached to an airless chamber. Describe what the scientist will observe when she opens the tap connecting the chamber to the flask. Explain your answer.
Answer:
The bromine gas particles would diffuse from a high to low concentration and so move upwards.
Explanation:
Maybe this is your answer ;{
estimate the pressure necessary to melt water at −10ºc if the molar volume of liquid water is 18.01 ml and the molar volume of ice is 19.64 ml. the molar entropy change for this process, 22.04 j/k, remains constant with temperature.
If the molar volumes of liquid water and ice are 18.01 ml and 19.64 ml, respectively, then 1334 atm of pressure is required to melt ice at 10 C. 22.04 J/K is the entropy change process.
The term "molar" relates to the mole, which is the unit of concentration molarity and the number of moles in a liter of a solution. The phrase most frequently refers to the molar concentration of a solute in a solution in chemistry. The mol/L or M units of molar concentration are used. Molar also describes many molecular quantities including molar mass, molar heat capacity, and molar volume.
The most popular unit of measurement for molal concentration or molarity is moles of solute per liter of solution. It is defined as the amount of solute material per unit volume of solution, or per unit volume available to the species, and is denoted by the lowercase letter.
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why would air moving over a cold current cause fog (advection fog)? group of answer choices the cold current produces the fog when kelp beds release condensation nuclei. all of the other answers are correct, and thus this is the best answer the cold current produces the fog by mixing with the air. the air is chilled, which decreases the capacity of air to hold water vapor, and eve
The correct answer is option C.
The air moving over a cold current cause fog or advection fog when the air is chilled, which decreases the capacity of air to hold water vapor, and eventually, the relative humidity reaches 100% - leading to condensation and fog formation.
What is advection fog?
When warm- moist air or warm air front slides over the cold air front or cold surface, it results in the formation of advection fog.
Resultantly, the air becomes saturated and chilled at high humidity levels due to which water vapors start to condense leading to fog formation.
Moreover, the optimal condition for the formation of advection fog is cloudy windy weather having moderate to powerful winds.
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The complete question is:
Why would air move over a cold current cause fog (advection fog)?
(a) the cold current produces the fog when kelp beds release condensation nuclei.
(b) the cold current produces the fog by mixing with the air.
(c) the air is chilled, which decreases the capacity of air to hold water vapor, and eventually, the relative humidity reaches 100% - leading to condensation and fog formation.
an arctic weather balloon is filled with of helium gas inside a prep shed. the temperature inside the shed is . the balloon is then taken outside, where the temperature is . calculate the new volume of the balloon.
When the balloon is taken outside where the temperature is –9 °C, then the final volume becomes 19.3 L
From the question given above, the following data were obtained:
Initial volume (V₁) = 20.9 L
Initial temperature inside the shed (T₁) = 13 °C = 13 + 273 = 286 K
Final temperature inside the shed (T₂) = –9 °C = –9 + 273 = 264 K
As we know pressure remains constant so Pressure = constant
The final volume (V₂) =?
By using the Charles law equation, we can obtain the final volume i.e. V₂
[tex]\frac{V1}{T1}[/tex] = [tex]\frac{V2}{T2}[/tex]
[tex]\frac{20.9}{286}[/tex] = [tex]\frac{V2}{286}[/tex]
Now cross multiply both sides
V₂ × 286 = 20.9 × 264
V₂ × 286 = 5517.6
Divide by 286 on both sides of the equation
[tex]V_{2}[/tex] = [tex]\frac{5517.6}{286}[/tex]
V₂ = 19.3 L
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The complete question is:
An arctic weather balloon is filled with 20.9L of helium gas inside a prep shed. The temperature inside the shed is 13 degrees C. The balloon is then taken outside, where the temperature is -9 degrees C. Calculate the new volume of the balloon. You may assume the pressure on the balloon stays constant at exactly 1 atm. Round your answer to significant digits.
A hiker climbs to the top of a mountain at rate of 0.5 me/hr. What are the speed and velocity of the hiker?
A hiker climbs to the top of a mountain at rate of 0.5 m/hr. The speed of hiker is 1.3 x 10⁻⁴ m/s and the velocity of the hiker is 1.3 x 10⁻⁴ m/s west.
Speed is a scalar quantity. It is used to measure the distance traveled in a period of time. It is represented by -
s = d/Δt
where,
s = speed
d = distance
Δt = change in time
Velocity is a vector quantity. It is used to measure the change in position, that is, displacement over the change in time. It is represented by -
v = Δs / Δt
where,
v = velocity
Δs = change in position/displacement
Δt = change in time
The standard unit of velocity and speed both is m/s.
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a 30.84 ml volume of 0.128 m naoh is required to reach the phenolpthalein endpoint in the titration of a 5.441 g sample of vinegar. calculate the percent acetic acid in the vinegar.
The percentage of acetic acid in vinegar is 4.36%
What is acetic acid?
The scientific name for acetic acid is ethanoic acid. It is an acidic, colorless liquid organic substance having the formula CH3COOH. Vinegar has a minimum of 4% acetic acid by volume, making acetic acid the primary component of vinegar besides water and trace elements.
Given,
Volume= 30.84 ml
Moles= 0.128
mass of vinegar= 5.441g
moles NaOH = 0.03084 ml x 0.128
M=0.00395
mass acetic acid = 0.00395 mol x 60.05 g/mol=0.237 g
Percentage of acetic acid:
= 0.237 x 100/ 5.441
= 23.7/5.441 = 4.36%
Hence, The percentage of acetic acid in vinegar is 4.36%
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Which element does the "X" in
the isotope notation
represent?
14X
6
A. C
B. O
C. Si
D. N
The element whose isotope is represented as [tex]_{6}^{14}X[/tex] is carbon -14. The atomic number of carbon is 6 and the mass number for the given isotope is 14 amu.
What are isotopes?Isotopes are atoms of same element with different mass numbers. Isotopes slightly changes in chemical and physical properties between each other.
Almost elements in the periodic table are having isotopes. However not all of them are stable. Some of them for heavy metals are radioactive isotopes and are not stable.
The isotope is represented by showing mass number in top of the symbol and atomic number at the bottom. The atomic number 6 corresponds to carbon. Hence, option A is correct. Carbon -14 isotope is given here.
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What is the group of Neon, and the family of it too?
The group of Neon is Group 8A and the family of it is noble gases or inert gases of the periodic table and includes helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn).
The term for these noble gas elements derives from their almost complete lack of reactivity with other elements or compounds. In reality, 1% of the atmosphere is made up of argon, which is present in the atmosphere in tiny proportions. Helium may also be found in natural gas reserves. The Group 8A elements are all colorless, odorless, monoatomic gases in their elemental state at ambient temperature.
Because the Group 8A elements contain a whole octet of eight valence electrons in their highest-energy orbitals ([tex]ns^{2}np^{6}[/tex]), they have a very low propensity to gain or lose electrons as covalent bonds allow atoms to exchange electrons to create ions or share electrons. Although it takes particular circumstances, they may be made to combine with other elements to produce compounds.
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