(c) The figure below shows two alkane molecules.
Methane
HIC-H
HICIH
Methane
Hexane
Hexane
HHHHHH
LIITIT
H-C-C-C-C-C-C-H
IITTIT
H. H HHHH.
The table below shows the melting points and boiling points of methane and
hexane.
Melting point in Boiling point in
°C
°C
-183
-95
-162
69
Compare the structure and properties of methane and hexane.
(1)
Answers
Methane is a gas which is colourless and and odorless. It is a hydrocarbon with formula CH₄. Where as Hexane is an alkane containing 6 carbon atoms. Its molecular formula is C₆H₁₄. For the structure refer the figure given below.
Coming to the properties there are both physical and chemical properties.
Hexane is a colourless volatile liquid and undergoes combustion reaction, being a higher hydrocarbon it undergo thermal cracking.
It is commonly used as solvents, biodiesel production etc. Boiling point is 69⁰C and melting point is 95⁰C.
Methane is a gas which is colourless and odorless. It is lighter in air, slightly soluble in water, it is flammable. boiling point is -162⁰C and melting point is -183⁰C.It is used as fuel, it is used in explosives.
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Related Questions
Which set of elements are ordered from small atomic radius to largest atomic radius? a.Fluorine, Chlorine, Bromine, lodine
b.Bromine, lodine, Chlorine, Fluorine
c.Chlorine, Fluorine, Bromine, lodine
d.lodine, Bromine, Chlorine, Fluorine
Answers
A Fluorine chlorine bromine iodide is the order of the elements that is ordered from small atomic radius to largest atomic radius as per their electrons and atom sizes.
What does atomic radius mean?A chemical element's atomic radius, is technically known as the average or typical distance between the nucleus's core and the outermost isolated electron, serves as a gauge for the size of an atom.
There are numerous types of non-equivalent definitions of atomic radius, and this is because the border is not a clearly defined physical entity.
What is the formula for calculating atomic radius?Only by measuring the separation between the nuclei of two contacting atoms and halving that distance can one determine the radius of an atom, and this stands true in the case of a covalent bond.
What factors influence atomic radius?A reduced atomic radius is the result of the electron cloud being drawn closer to the nucleus due to a higher effective nuclear charge's greater attraction to the electrons.
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Correct Question
Which set of elements are ordered from small atomic radius to largest atomic radius?
a. Fluorine, Chlorine, Bromine, Iodine
b. Bromine, Iodine, Chlorine, Fluorine
c. Chlorine, Fluorine, Bromine, Iodine
d. Iodine, Bromine, Chlorine, Fluorine
List the three variables in the density equation, and explain what each variable represents. I'll give brainliest for whoever answers first
Answers
The three variables in the density equation are the mass of the substance, the volume of the substance, and the density of the substance.
A variable is a characteristic that can be measured (such as mass, acceleration, volume, height, etc.) and that can take on different values.
An experiment typically has three types of variables:
The variable that is altered by the scientist is the independent variable.The variable that changes to a modification in the independent variable is the dependent variable. When the independent variable is altered, the dependent variable changes.The variable that remains constant is the controlled variable.Now, in density equation i,e,. Density = Mass/Volume.
The volume of the substance is the independent variable, while its mass is the dependent variable, because as the volume of the substance increases, so does its mass. As a result, mass depends on volume.
Density, on the other hand, is the controllable variable because its mass-to-volume ratio remains constant for any particular substance.
Thus, in the density equation, mass is the dependent variable, volume is the independent variable and density is the controlled variable.
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Water is a polar molecule. Since oxygen has a slight negative charge and each hydrogen has a slight positive charge, this allows water molecules to.
Answers
Water is a polar molecule. Since oxygen has a slightly negative charge and each hydrogen has a slight positive charge, this allows water molecules to form a hydrogen bond.
What is a polar molecule?Water is a polar molecule. It is a very important solvent. It is also called a universal solvent. In water, Oxygen is a negative charge molecule and hydrogen is a positive charge.
Small negative charges on oxygen atoms in other water molecules are drawn to the small positive charges on hydrogen atoms in a water molecule. A hydrogen bond is a name given to this weak attraction. Different charges are drawn to one another.
Hydrogen bonds are very weak. The water molecules are charged molecules. The positively charged hydrogen attracts the negatively charged hydrogen atoms.
Therefore, Water is a polar molecule. Since oxygen has a slightly negative charge and each hydrogen has a slight positive charge, this allows water molecules to form a hydrogen bond.
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Calculate the maximum wavelength of light capable of dissociating the cl–f bond in one molecule of chlorine monofluoride if the bond energy, or bond dissociation energy, is 251 kj/mol.
Answers
According to bond energy, the maximum wavelength of light is 475 nanometers.
We need to know about bond energy to solve this problem. Bond energy is the energy needed to bond other atoms in the molecule. To determine the energy in one molecule of chlorine monofluoride, we can use this formula:
E = BE / Na
where E is the energy of photon, BE is bond energy and Na is Avogadro's number (6.02 x 10²³ atoms/mol)
Now, we can calculate the shortest wavelength by using Einstein's equation for photon energy:
E = h . c / λ
where h is Planck constant (6.6 x 10¯³⁴ J.s), c is the speed of light (3 x 10⁸ m/s) and λ is the wavelength.
From the question above, we know that
BE = 251 kJ/mol = 251 x 10³ J/mol
By substituting the given parameters, we can calculate the maximum wavelength
E = BE / Na
h . c / λ = 251 x 10³ / 6.02 x 10²³
6.6 x 10¯³⁴ . 3 x 10⁸ / λ = 251 x 10³ / 6.02 x 10²³
λ = 4.75 x 10¯⁷ m
λ = 475 nm
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complete the paragraph to describe binary systems
Answers
A binary star system is made of stars, two of which is brighter than the other.
Astronomers are able to detect the dimmer star because its gravity causes the bright star to wobble
Astronomers can also spot the dimmer star by observing a phenomenon called a(n) eclipsing binary. This happens when the dim star passes in front of the bright star.
When one astronomical body is obscured by another or when a body moves between it and the observer, this is known as an eclipse.Partial solar eclipses can be seen if you are in the moon's penumbra during a solar eclipse. Solar eclipses happen when the sun is partially blocked by the moon.When the sun, moon, and earth align, the earth covers the moon's view of the sun, causing lunar eclipses.To know more about eclipses visit : https://brainly.com/question/12075389
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What is the difference in the atomic models of J.J Thomson and Rutherford??
Answers
Answer:
Rutherford proved J.J is wrong.
Explanation:
The Plum Pudding Model which was put forth by J.J Thompson stated that atoms are tiny particles of positively charged particles, with tiny negative charged particles stuck inside.
When Rutherford did the goldfoil experiment, he concluded that electrons (the negatively charged particles) actually revolve around the nucleas.
what's the nucleas?
So this too, was put forth by Rutherford that there is a centre of positive charges in an atom called nucleas it consists of protons and neutrons
hence, Rutherford proved that Plum Pudding Model was wrong.
hope I helped you :)
Suppose naoh standardization of khp determined that a volume of 25. 00 ml naoh has a concentration of 0. 049 m. Suppose 22. 20 ml of khp was used to get to the endpoint in this standardization. What is the mass of khp dissolved in 50. 00 ml of the standardization khp titrant?.
Answers
The mass of KHP dissolved in 50.00 mL of the titrant is 0.5634 g.
KHP and NaOH react in a 1:1 ratio. That means that the amount of NaOH used is equal to the amount of KHP in the sample. We can calculate this amount:
c = n/V, so n = c * V = 0.049 M * 0.025 L = 0.001225 mol of NaOH and KHP
With this, we can calculate the amount of KHP in the 50.00 mL sample:
22.20 mL : 0.001225 mol = 50.00 mL : X
X = 0.001225 mol * 50.00 mL / 22.20 mL = 0.002759 mol
Finally, using the molar mass of KHP (204.22 g/mol), we calculate the mass of KHP in the titrant:
n = m/M, so m = n * M = 0.002759 mol * 204.22 g/mol = 0.5634 g
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letes Use this figure to answer the following questions. est 5 cm - 5 cm 5 cm 7 Apply What is the surface area-to-volume ratio of this cube? 150
Answers
Answer:
5cm is the answer because 5-5 is o and the one 5 is remaining so 5 is the answer.
Can someone help (significant figures)
Answers
Answer:
1. 34.25
2.716
3.0.02181
4.1,323.194921978313 round use calculator
5.9.89
6.90 or 91
7.0.0269
Explanation:
Round if you can
Help! I'm timed!
Xian drew a diagram to compare deletion mutations and substitution mutations.
Which label belongs in the area marked "X"?
∆ may change the type of amino acid
∆ decreases the number of bases in the sequence
∆ does not change the type of amino acid
∆ increases the number of bases in the sequence
Answers
Decrease the number of bases in the sequence will fall under the category of deletion mutation.
When a portion of a DNA molecule is not replicated during DNA synthesis, a deletion mutation happens. This uncopied region can range in size from a single nucleotide to an entire chromosome. If this DNA is lost during replication, a hereditary disorder may result.Loss of any number of nucleotides, from a single nucleotide to an entire section of a chromosome, can occur during deletion mutation.In terms of genomics, substitution is a sort of mutation where one nucleotide is changed for a different nucleotide. The phrase can also be used to describe switching out one amino acid for another in a protein.Three different kinds of substitution mutations exist: Nonsense. Missense. Silent.Therefore, Decrease the number of bases in the sequence is deletion mutation.
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What similarities and differences can you identify between neon signs and fireworks?
Answers
The fireworks are colorful and neon signs are orange in color.
What is the difference between neon signs and fireworks?When a firework is fired, the atoms of the various chemical compounds inside it absorb energy.
When the electrons return to lower energy levels, they emit colored light.
Various colors can be produced depending on the chemical employed. In glass tubes filled with neon, gas is neon lights or signage.
When the lamp is plugged in, the electrical energy causes the neon electrons to leap to higher energy levels; when they go to lower levels, colorful light is given out.
The neon never runs out, which is neat. Electrical energy is the sole resource that is consumed.
Since they are not destroyed, the electrons can be employed repeatedly to advance through levels.
The orange light that neon emits is visible.
Even while neon signs often glow in orange light, there are many other hues that can be used.
The changes occur when other gases, such as argon or krypton, or painting the tube to generate a specific hue when lit, are used instead of neon.
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liquid disilicon hexachloride reacts with water to form solid silicon dioxide, hydrogen chloride gas, and hydrogen gas. be sure to include the state of each reactant and product in the equation.
Answers
The liquid disilicon hexachloride reacts with water to form solid silicon dioxide, hydrogen chloride gas and hydrogen gas are
[tex]Si{2}Cl{6} (l) + 4H{2}O (l) ------ > 2SiO{2} (s) + 6HCl (g) + H{2} (g)[/tex]
When liquid disilicon hexachloride reacts with water to form solid silicon dioxide , hydrogen chloride gas and hydrogen gas , the following chemical equation is:
[tex]Si{2}Cl{6} (l) + H{2}O (l) ------ > SiO{2} (s) + HCl (g) + H{2} (g)[/tex]
now , we have to balance the eqaution,
Reactants product
Si 2 1
Cl 6 1
H 2 3
O 1 2
Multiply 4 with [tex]H{2}O[/tex] 2 with [tex]SiO{2}[/tex] and 6 with HCL, we get
[tex]Si{2}Cl{6} (l) + 4H{2}O (l) ------ > 2SiO{2} (s) + 6HCl (g) + H{2} (g)[/tex]
now ,
Reactant Product
Si 2 2
Cl 6 6
H 8 8
O 4 4
Thus, we get the desire equtions.
The liquid disilicon hexachloride reacts with water to form solid silicon dioxide, hydrogen chloride gas and hydrogen gas are
[tex]Si{2}Cl{6} (l) + 4H{2}O (l) ------ > 2SiO{2} (s) + 6HCl (g) + H{2} (g)[/tex]
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what is the naming for this?
Answers
HELP PLEASE 30 POINTS.
Answers
Answer: a c 31 45 65 nitrogen
Explanation:
a typical volume leaving the large intestine might be 180 ml. if the volume exiting the large intestine were 396 ml, then it would most likely indicate a case of
Answers
A typical volume leaving the large intestine might be 180 ml. It would most likely indicate a case of diarrhea, if the volume exiting the large intestine were 396 ml.
Large intestine is an organ which is larger in diameter than the small intestine. It is connected to small intestine at one end and to anus at the other end. The large intestine includes the colon, rectum and anus.
Diarrhea is a health/digestive issue. If it is not treated in time, it can be harmful and lead to serious health problems .An excessive loss of body fluids and weakened immune system may lead to the diarrhea.
Diarrhea and vomiting both can be associated with excessive loss of body fluids resulting in dehydration.
If the volume exiting the large intestine were 396 ml, then it would most likely indicate a case of diarrhea.
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Student wants to try to convince your parents to stop serving piece for dinner she lays an argument peas are high in fructose which is a type of sugar which test could she use to provide scientific evidence to support her argument that Peas are high in fructose
Answers
Benedict's test should be done to prove it.
Glucose is the main sugar which is mainly found in our blood. it is present in carbohydrate products. People with fructose intolerance should avoid peas because it contain a lot of fructose
Benedict's test is a test where chemicals are used to check the presence of sugar in a particular substance. The sugar that is present in the substance will react with the reducing sugar present in the substance on heating. the positive result is shown by the colour change from clear blue to brick red precipitate.
Pea contains a lot of fructose and it can be proved by doing benedict test.
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The density of water is? 9810 n/m^3 1000 slug/m^3 1.94 slug/ft^3 62.4 lb/ft^3
Answers
The density of water is 1.94 [tex]slug/ft^3[/tex] if 997 kg/m^3 is rounded to 1000.
What is Density of liquids?The density of a liquid is distinct from that of a solid.
A liquid's density serves as a gauge for its relative weight in relation to the quantity being evaluated. The liquid that weighs heavier is more dense if you weigh or measure the same volume of two different liquids.
It will float on the water if you add a liquid that is less dense than water to the surface of it. The surface of the water will sink if a substance is added that has a density greater than water.
Some examples are:
Liquid Temperature Density
Alcohol, methyl 25 786.5
Alcohol, propyl 25 800
Ammonia (aqua) 25 823.5
Aniline 25 1019
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How does a balanced chemical equation satisfy the Law of Conservation of Mass?
Answers
The balanced equation always obey the law of conservation of mass.
As the balanced equations have equal number of atoms in both that is reactants and product side.that means the number of atoms on both the sides are equal before or after the reaction.for example an unbalanced equationN2 + H2 = NH3here before the reaction, the number of atoms of nitrogen is 2 but after the reaction the number of atom of nitrogen is 1.Same , The number of atom of hydrogen is 2 and after the reaction the number of atoms of hydron is 3.Change in the atomic number causes the change in the mass of the element. hence in this equation the mass is not conserved.SO, for the conservation of the mass , the number of atoms should be equal in both the side.for example , for balanced equationN2 + 3H2 = 2NH3Here the number of atoms of nitrogen is 2 in both the sides.The number of atoms of hydrogen is 6 in both the sides.since the number of atoms are same in both the sides of the reactions then the mass of the elements/ compound is also same.
Hence the mass is conserved in balanced equation.
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Which of the following describes the length of a football field using the metric system?
Answers
Answer:
91.44 meters
Explanation:
There are no choices listed but an American pro football field is 100 yards long, which is 91.44 meters. Rounded to the nearest whole number that would be 91 meters.
How many valence electrons does the ground-state electron configuration of nitrogen have?.
Answers
Answer:
5 valence electrons
Explanation:
A material with a (n) __________specific heat can absorb a great deal of thermal energy without a great change in temperature
Answers
A material with a high specific heat can absorb a large amount of thermal energy while maintaining a constant temperature.
What is specific heat capacity?
The amount of energy required to raise the temperature of 1 kg of mass of a substance is defined as its specific heat capacity.
It is given mathematically as:
C = [tex]\frac{Q}{m}[/tex]ΔT
where
Q denotes the amount of energy supplied.
m denotes the substance's mass.
ΔT denotes the change in temperature of the substance.
The equation can be rewritten as follows:
ΔT = [tex]\frac{Q}{mC}[/tex]
As a result, we can see that a substance's temperature rise is inversely proportional to its specific heat capacity.
As a result, a material with a high specific heat can absorb a large amount of thermal energy without significantly changing its temperature.
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On the table below, record your observations before and after the interactions and explain how mass was conserved. Describe the
changes in properties that prove a chemical reaction occurred. The first row is an example.
Observations Before
Observations After
How was mass
Proof of a Chemical
Interaction
Interaction
conserved?
Reaction
Example: Sugar +
Heat
The sugar is in tiny white
particles in a pile. Heat is
There is a solid, light brown The mass of the sugar is the
mass at the bottom of the pot. same in melted form as it is
There was not a chemical
not seen but is implied by the It has a mass of 100 grams.
reaction. Sugar did not
heat source. The pile of
in solid crystal form.
change composition. It only
sugar in the in pot has a mass
melted. Melting point is a
of 100 grams.
physical property, and this is
Steel Wool
a physical change.
Oxygen (Fire)
Egg
Heat
Water + Heat
Zinc + Hydrogen
Chloride
Sodium
Hydroxide •
Copper Sulfate?
Answers
Sugar Heat The sugar is in tiny white debris in a pile. warmth is not seen but is implied through the heat source. The pile of sugar in the pot has a mass of one hundred grams. there may be a stable, light brown mass at the lowest of the pot. It has a mass of 100 grams.
The mass of the sugar is the same in melted form as it is in strong crystal form. there has no longer a chemical response. Sugar did not trade composition. It most effectively melted. Melting point is a physical property, and this is bodily change. metallic Wool Oxygen fireplace The metal wool has a silky look and it is rolled up and has a mass of 6 grams.
The oxygen is not visible however it's far internal of an oxygen tank which has a mass of 1 gram. there's brown mustard color sand in a pile and has a mass of seven grams. The mass of the steel wool turned into blended with the mass of the oxygen tank and that became the same seven grams. there has been a chemical reaction. The metallic wool blended with the oxygen of the tank creates a brand new substance known as iron oxide. Egg heat The egg is vicinity on a flat floor and has its shell on. The egg has a mass of forty-five grams. the heat isn't visible however is implied with the aid of the heat supply of the kitchen. The egg is cooked and it's far cut loose from the shell. It has a mass of 45 grams the cooked egg 40 grams and the shell five grams.
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Classify each of the following compounds as an acid, base, or both. be sure to answer all parts.
a. ch3ch2oh (select)
b. ch3ch2ch2ch3 (select)
c. ch3co2ch3 (select)
Answers
Thus, we can conclude that following compounds are classified as follows.
[tex]CH_3CH_2OH[/tex] - can be both acid and base
[tex]CH_3CH_2CH_2CH_3[/tex] - very weak acid
[tex]CH_3CO_2CH_3[/tex] - can be both acid and base
ExplanationAccording to Bronsted-Lowry an acid is defined as the specie which is able to donate hydrogen ions when dissolved in water.
On the other hand, bases are the species which are able to donate hydroxide ions when dissolved in water.
A specie which is able to accept a hydrogen atom and also able to donate a hydroxide ion will act as both acid and a base.
For example, [tex]CH_3CH_2OH[/tex] is able to donate a hydroxide ion and simultaneously can accept a hydrogen ion.
In [tex]CH_3CH_2CH_2CH_3[/tex] , the hydrogen atoms are strongly held together by the carbon atoms due to the small electronegativity difference between carbon and hydrogen atom. Hence, it will be a weak acid.
On the other hand, [tex]CH_3CO_2CH_3[/tex] can loose a hydrogen atom or it can also gain a hydroxyl group. This is due to the electronegativity difference between oxygen and hydrogen atom.
Therefore:
[tex]CH_3CH_2OH[/tex] - can be both acid and base
[tex]CH_3CH_2CH_2CH_3[/tex] - very weak acid
[tex]CH_3CO_2CH_3[/tex] - can be both acid and base
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help please! question in pic! 16 points!!
Answers
According to the Equilibrium Law, addition of products will shift the equilibrium towards left to the reactants and if the products are taken out the equilibrium will proceed in the forward direction to the right, to the products.
What is Equilibrium Law?Equilibrium Law refers to the state at which the rate of forward reaction is equal to the rate of backward reaction.
Equilibrium Law explains how a reaction in equilibrium will react to disturbances in the amount of products and reactants to counteract the disturbance and also how pH will impact equilibrium.
For example, if we add more product to a chemical reaction then to counteract the disturbance the equilibrium will shift towards left and more amount of reactants are formed. Similarly, if we add more amount of reactant to a chemical reaction then to compensate the change equilibrium will be shifted towards the right side and more amount of product is formed.
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Name and describe three parts that make up atoms
Answers
protons, neutron and electrons are the 3 constituents of atom
Atoms are too small to see by eyes without any equipment , so we have to use the models to visualize them.
The current model has a central nucleus which made up of protons and neutrons surrounded by the electrons in the shells
Protons and neutrons are almost of same size, but protons have a positive charge on them, and neutrons do not have any charge.
Electrons are much smaller than protons and neutrons and have a negative charge.
Protons and neutrons are made up of even smaller particles which is called quarks.
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how are elements above and below each other similar on the periodic table both physically and chemically?
Answers
Elements below and above each other belongs to same group.
According to the Modern Periodic Law, the elements in the periodic table are organised in that order. It claims that the atomic numbers of the elements are periodic functions of their physical and chemical qualities. The quantity of valence electrons in an atom determines its physical and chemical properties.The number of electrons in an element's valence shell, which is its outermost shell, is also indicated by the element's group number. The great majority of the physical properties, chemical properties, and reactivities of the elements are caused by these valence electrons.The group's elements share a number of chemical characteristics. This is due to the fact that both of their atoms' highest occupied energy levels have an equal number of electrons.For example, Li, NA, K, and Cs all have one valence electron. They share characteristics as a result.Learn more about periodic table here:
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Nitrogen (n2) is made up of 99.632% 14n and 0.368% 15n. the atomic mass of 14n is 14.003 amu. the atomic mass of 15n is 15.000 amu. what is the average atomic mass of nitrogen? 1.40 amu 1.40 lowercase a m u 14.007 amu 14.007 lowercase a m u 15.00 amu 15.00 lowercase a m u 155.00 amu
Answers
The average atomic mass of nitrogen is 14.003 amu.
Nitrogen exists in the form of two isotopes 14N and 15N.
In case an element exists in more than one type of isotope, then its average atomic mass can be calculated using the following formula
Average Atomic Mass = (Percentage abundance of isotope 1) x (Mass of isotope 1) + (Percentage abundance of isotope 2) x (Mass of isotope 2)/100
We are given that
Mass of isotope 1 = 14 amu
%age abundance of isotope 1 = 99.632 %
Mass of isotope 2 = 15 amu
%age abundance of isotope 2 = 0.368 %
Putting the above values in the equation
Average Atomic Mass = (99.632) x 14 + (0.368) x 15/100
Average atomic mass = 14.003 amu
Hence, the average atomic mass of nitrogen is 14.003 amu.
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Answer: It is 14.007 did the test
Explanation:
Two scientists were interested in discovering the effect of caffeine on heart rate. Identify the following:
Independent Variable :
Dependent Variable :
Constant:
Control:
Answers
Discovering the effect of caffeine on heart rate. The Independent Variable is caffeine, dependent Variable is heart beat, Control is group given no caffeine and constant is same amount of caffeine.
What is Independent variable?Independent variable is defined as varible which is changed by the experimenter.
What is Dependent Variable?Dependent variable is defined as those variable which depends on the independent variable.
What is Control group?It is defined as that group which do not receive experimental treatment.
What is Constant Variable?It is that variable which is kept unchanged for all types of groups in the experiment.
Thus, we concluded that the the Independent Variable is caffeine, dependent Variable is heart beat, Control is group given no caffeine and constant is same amount of caffeine.
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A gas mixture being used to simulate the atmosphere of another planet at 23°c consists of 337 mg of methane, 148 mg of argon, and 210 mg of nitrogen. The partial pressure of nitrogen at 296 k is 19. 0 kpa. Calculate the total pressure of the mixture.
Answers
The total pressure of the mixture is 65.5 kPa.
According to Dalton's Law of Partial Pressure,
The partial pressure of gas = Mole fraction of gas × Total pressure
Total Pressure = Sum of all the gases partial pressures
The number of moles of methane is,
[tex]Moles \: of \: methane \: (16 g/mol) = 337 \: mg \times \frac{1 g}{1000 mg} \times \frac{ 1 mol}{16 g }[/tex]
= 0.021 mols
The moles of methane are 0.021 mols.
The number of moles of the argon,
[tex]Moles \: of \: argon (40 g/mol) = 148 \: mg \times \frac{ 1 g}{1000 mg } \times \frac{ 1 mol}{40 g} [/tex]
= 0.003 mols
The number of moles of argon is 0.003 mols.
The number of moles of nitrogen is,
[tex]Moles \: of \: nitrogen (28 g/mol) = 296 \: mg \times \frac{ 1 g}{1000 mg} \times \frac{ 1 mol/}{28 g}[/tex]
= 0.010 mols
The number of moles of nitrogen is 0.010 mols.
The total number of moles is,
= 0.021 + 0.003 + 0.010
= 0.034 mols
[tex]Mole \: fraction = \frac{ Moles \: of \: solute }{Total \: number \: of \: moles \: of \: soulte \: and \: solvent}[/tex]
[tex] = \frac{ 0.010 }{ 0.034} [/tex]
= 0.29
[tex]0.29 \: P _{total} = 19 \: kPa [/tex]
[tex] P _{total} = \frac{ 19 \: kPa }{0.29}[/tex]
= 65.5 kPa
Therefore, the total pressure of the mixture is 65.5 kPa.
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Why would an alkali metal in row 4 have a lower ionization energy than another alkali metal in row two?
Answers
An alkali metal in row 4 has lower ionization energy than another alkali metal in row two because of the greater size of its atom.
Alkali metals belong to the first column of the periodic table. They readily lose their one valence electron in the outermost shell to form ionic compounds with the nonmetals. Lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr) are alkali metals.
Ionization energy means the measure of the capability of a neutral atom to lose or donate its electrons for a chemical reaction. It is an endothermic process that requires energy to lose electrons. Ionization energy in a periodic table increases from left to right while decreases when we move from top to bottom. This is all because of the size of an atom.
The valence electron of an alkali metal in row 4 is far away from the nucleus of the atom and experiences the least forces of attraction. It can readily lose its valence electron in the outermost shell without the requirement of greater energy. Consequently, the alkali metal in row 4 has low ionization energy.
On the other hand, the alkali metal in row 2 has a smaller size. Its valence electron experiences a larger force of attraction from the nucleus. It, therefore, requires greater ionization energy to lose the electron. This means that the alkali metal in row 2 has high ionization energy.
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