Answers
Nuclear fission causes a neutron to split the isotope U-235 when it collides with its nucleus. When a slow neutron interacts with a heavy nuclide like 235U, nuclear fission can occur (0.025 eV).
What happens when uranium-235 atoms are bombarded by slow moving neutrons?When a slow neutron interacts with a heavy nuclide like 235U, nuclear fission can occur (0.025 eV). If a fission (or splitting apart) occurs, the nuclear material splits into two (on average) about equal fragments that travel away with kinetic energy, producing heat.
Nuclear fission causes a neutron to split the isotope U-235 when it collides with its nucleus. Two or three additional neutrons as well as fission products are released during this fission process. The chain reaction is continued by some of the emitted neutrons. There is significant energy released in every fission reaction.
When a uranium atom divides, additional neutrons are also released. The process keeps repeating again as these neutrons keep crashing into more uranium atoms. This process is called a nuclear chain reaction. This reaction is controlled in nuclear power plant reactors to produce a desired amount of heat.
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Related Questions
The molar mass of oxygen gas (O2) is 32.00 g/mol. The molar mass of C3H8 is 44.1 g/mol. What mass of O2, in grams, is required to completely react with 0.025 g C3H8?"Determine the mass of each of the following compounds, rounding molar masses of elements to the gram before adding up the total: C3H8 (propane)"
Answers
The molar mass of oxygen gas (O2) is 32.00 g/mol.
The molar mass of C3H8 is 44.1 g/mol.
This kind of reaction is a combustion:
C3H8 + 5O2 → 3CO2 + 4H2O (In a combustion we obtain CO2 and H2O. Don't forget to balance this equation)
Procedure:
Let's use stoichiometry to solve this
44.1 g C3H8 --------- 5 x 32.00 g O2
0.025 g C3H8 --------- X
X = 0.091 g O2
Answer: mass of O2 required = 0.091 g
Give the number of valence electrons in krypton. Write out the electronic configuration for the valence electrons. Valence electrons: _______ Electronic configuration for the valence electrons: ________
Answers
ANSWER
[tex]\begin{gathered} \text{ Valence electrons; 8} \\ \text{ Electronic configuration for the valence electrons; 4s}^2\text{ 4p}^6 \end{gathered}[/tex]EXPLANATION
Krypton is an example of a noble gas. Noble gases are not reactive because their octet state has been completely filled. Krypton belongs to group 0 or 18.
Since the octet state is completely filled, then the number of electrons at the outermost shell is 8
Therefore, the valence electrons of Krypton is 8
The electronic configuration of the valence electron is written below as
[tex]\text{ 4s}^24p^6[/tex]i need to put 5 grams of hydrogen through two sets of chemical reactions, one resulting in a covalent outcome, the other resulting in an ionic outcome. I also need to balance the equations used during this process as well as calculate the number of molecules produced by the covalent compound, and the mass of the ionic product.This is a big project in my chemistry class and I've chosen Hydrogen as my element to use throughout these chemical reactions. I will provide the assignment outline and the work I've done so far :)thank you so very much for the help!
Answers
2H2(g) +O2(g) → 2H2O(g)
Mass = 5 g : :
Moles = 4.96 : : 4.96
1.1 number of moles for hydrogen :
moles = mass /Molecular mass
= 5g/1,00784
=4.96 moles
1.2 Determine molar ratio in oder to get the moles for product 2H2O
we see that :
2 moles of Hydrogen produces: 2 moles of water
so, 4.96 moles of hydrogen will produce : x = 4.96*2 /2 = 4.96
This means that moles for water = 4.96
1.3 Calculating molecules of the productn = 4.96moles
Molecules of H2O = 4.96 mol * 6.022×10^23molecules/1mol
=2.99x10^24 molecules
What is the theoretical yield when 1.1134 g of gold (III) oxide is reacted with 20.0 L of H2 at 1.000 atm and 800K.
Answers
The theoretical yield of the gold is 0985 g
What is the theoretical yield?Recall that the yield is defined as the mass of the product that is obtained in the reaction. Let us recall that a chemical reaction must involve the interaction of the reactants so as to obtain in a given amount, the products of the particular reaction that is in question.
Now;
Number of moles of the gold (III) oxide = 1.1134 g/442 g/mol = 2.5 * 10^-3 moles
We can get the number of moles of the hydrogen from the ideal gas equation;
PV = nRT
n = PV/RT
n = 1.000 atm * 20.0 L/0.082 atm LK-1mol-1 * 800K
n = 0.3 moles
Given that the mole ratio of the reaction is 1 mole of the oxide to three moles of hydrogen;
1 mole of gold (III) oxide reacts with 3 moles of hydrogen
2.5 * 10^-3 moles of gold (III) oxide reacts with 2.5 * 10^-3 moles * 3 moles /1 mole
= 7.5 * 10^-3 mole of hydrogen
Hence the hydrogen is present in excess.
The theoretical yield =
1 mole of the oxide produced 2 moles of the gold
2.5 * 10^-3 moles of the oxide produced 2.5 * 10^-3 moles * 2 moles/1 mole
= 5 * 10^-3 moles of gold
Theoretical yield = 5 * 10^-3 moles of gold * 197 g/mol
= 0985 g
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Name the attatched alkene
Answers
Answer:
limonene molecule.
Explanation:
How many grams of fluorine gas occupy 543.2ml and exert 123456 pa of pressure at 29.8 degrees Celsius
Answers
Answer:
m = 506 grams of fluorine
Explanation:
Given:
M = 19·10⁻³ kg / mol - molar mass of fluorine
V = 543.2 mL = 543.2·10⁻³ m³
p = 123456 Pa
t = 29.8°C
_____________________
m - ?
Temperature in degrees Kelvin:
T = 273.15 + t = 273.15 + 29.8 = 302.95 K
Clapeyron-Mendeleev law:
p·V = (m/M)·R·T
Mass of fluorine:
m = p·V·M / (R·T)
m = 123456·543.2·10⁻³·19·10⁻³ / (8,31·302.95) ≈ 0.506 kg
or m = 506 g
During her presentation, Zahara was asked several questions from the audience and to provide the molecular formula for molecules that the audience had questions about. Help Zahara show the molecular formula for the following compounds: Trisilicon tetranitride
Answers
Because tri means 3, there are 3 silicon atoms, and tetra means 4, so there will be 4 nitrogen atoms, the answer is:
[tex]_{N_4Si_{3_{}}}[/tex]What is the mass in grams of 8 moles of ammonia, NH3?
Answers
The first step to find the mass of the 8 moles of NH₃ is to find the molar mass of NH₃. The molar mass of any compound is the mass of one mol of it. To calculate it, we have to look for the atomic masses of the elements that the molecule has.
N: 14.01 amu
H: 1.01 amu
Then the molar mass of NH₃ will be:
molar mass of NH₃ = 14.01 + 3 * 1.01
molar mass of NH₃ = 17.04 g/mol
Now that we know the molar mass of NH₃ (the mass of one mol of it) we can easily find the mass of 8 moles.
mass = 8 moles of NH₃ * 17.04 g/mol = 136.32 g
mass = 136.32 g
Answer: the mass in grams of 8 moles of ammonia is 136.32 g
What two properties change that would cause a boiled egg to drop into a container, that’s mouth was smaller than the egg? 1. Temperature 2. Pressure 3. Volume 4. Number of particles
Answers
Answer:
2. Pressure
4. Number of particles.
Explanation:
If we drop a boiled egg into a container with a smaller mouth than the egg, we can note a change in the pressure inside the container, because initially, we have the atmospheric pressure inside the container but the egg will impose a different pressure inside; and the number of particles will be affected too because we suppose that the container is exchanging particles with the ambient so we wouldn't have an exact amount of particles in the container because of this exchange dynamic, so if the egg is covering the mouth of the container, the number of particles would be constant.
The answers would be 2. Pressure and 4. Number of particles.
What is known about the first forensic laboratory?
A.
It was opened by the Los Angeles Police Department.
B.
It was started by the Federal Bureau of Investigation.
C.
It opened in the late 1800s.
D.
It was built by a Chinese emperor in the 1200s.
Answers
Answer:
It was started by the FBI
If you have 4 cups of flour, 2 sticks of butter, 8 eggs, 4 cups of sugar, 2 cups of milk, and 4 tsp of baking powder, how many cakes can you make?
Answers
Based on the mole ratio of the reactants, 2 cakes can be made.
What are limiting reactants?Limiting reactants are the reactants in a chemical reaction that are used up in a reaction.
Limiting reactants are the reactants upon which the reaction depends. Once the limiting reactant is used up, the reaction will stop.
Hence, the amount of product that can be formed from a reaction depends on the limiting reactant.
The limiting reactant of a reaction is obtained from the mole ratio of the reactants in the reaction.
Considering the equation of the reaction of the baking of cake:
2 cups flour + 1 stick butter + 4 eggs + 2 cups sugar + 1 cup milk + 2 tsp. baking powder = 1 cake
The amount of reactants present:
4 cups of flour,2 sticks of butter,8 eggs,4 cups of sugar,2 cups of milk, and4 tsp of baking powderThe amount of the reactants available is twice their mole ratio, hence two cakes can be made.
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A 6.5 L gas sample at 298 K and 0.51
atm expands until a volume of 9.9 L is
reached. What will be the final
temperature if the final pressure is
0.65 atm? Please show the work.
Answers
The final temperature if the final pressure is 0.65 atm will be 585 K
It is given that
Initial Volume of sample = V1 = 6.5 L
Initial temperature = T1 = 298 K
Initial pressure = P1 = 0.51 atm
Final Volume = V2 = 9.9 L
Final temperature = T2 = ?
Final pressure = P2 = 0.65 atm
Gay-Lussac's law - The pressure of a gas is directly proportional to the. temperature when volume and amount of substance is constant. P1/T1 = P2/T2 Combined gas law P1V1/T1 = P2V2/T2 Use the gas laws for pressure, volume and temperature calculations.
P1V1/T1 = P2V2/T2
0.52 x 6.5/298 = 0.65 x 9.9/T2
0.011 = 6.435/T2
T2 = 585 K
Hence, final temperature if the final pressure is 0.65 atm will be 585 K
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ions can travel directly from the cytoplasm of one animal cell to the cytoplasm of an adjacent cell through _____.
Answers
Ions can travel directly from the cytoplasm of one animal cell to the cytoplasm of an adjacent cell through gap junctions.
What is cytoplasm?Cytoplasm is the gelatinous liquid that fills the inside of a cell.
The cytoplasm is composed of water, salts, and various organic molecules. Some intracellular organelles, such the nucleus and mitochondria, are enclosed by membranes that separate them from the cytoplasm.
The cytoplasm has the following functions :
The cytoplasm functions to support and suspend organelles and cellular molecules.The cytoplasm also has many cellular processes which occur in them such as protein synthesis, the first stage of cellular respiration (known as glycolysis), mitosis, and meiosis.Learn more about the cytoplasm at: https://brainly.com/question/174023
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-Sulfuric acid, H2SO4, can be neutralized by sodium hydroxide, NaOH. The unbalanced equation is:H2SO4(aq) + NaOH(aq) → Na2SO4(aq) + H2O(l)A student who was asked to balance the reaction wrote the following:H2SO4(aq) + Na2OH(aq) →Na2SO4(aq) + H3O(l)Is this correct? Explain why or why not using what you know about the law of conservation of mass and chemical changes. If necessary, provide the correct balanced equation.- How to balance reactions? include tips
Answers
Answer:
No, the student did not balance the equation correctly
The balanced equation of reaction is:
[tex]H_2SO_{4(aq)}\text{ + 2NaOH}_{(aq)}\text{ }\rightarrow\text{ Na}_2SO_{4(aq)}\text{ + 2H}_2O_{(l)}[/tex]Explanation:
The law of conservation of mass states that:
What this simply means in relation to chemical equations is that, there must be the same number of moles of atoms of each element on either side of the reaction
Looking at the equation given by the student, we can clearly see that the correct form of the molecules is not written although we have an equal number of moles shown
Thus, we have the balanced equation of reaction as follows:
[tex]H_2SO_{4(aq)}\text{ + 2NaOH}_{(aq)}\text{ }\rightarrow\text{ Na}_2SO_{4(aq)}\text{ +2H}_2O_{(l)}[/tex]From the above, we can see the balanced equation of reaction
9) A base can release hydroxide ions in a solution. In this following reaction, which
one is the base?
NaOH(s) + H20(1) - Na+(aq) + OH-(ag)
Answers
Answer:
NaOH
Explanation:
Sodium hydroxide is a proton acceptor. Metal hydroxides are almost always bases. H₂O is water and is neutral. Sodium is a positively charged metallic ion. Hydroxide is a negatively charged ion.
identify the functional group and name the compound ch3ch2ch2ch2ch2ch2cho
Answers
Answer: valeraldehyde
Explanation:
I had to memorize this one
The functional group present is aldehyde and name of compound is valeraldehyde.
What are functional groups?Functional group is defined as a substituent or group of toms or an atom which causes chemical reactions.Each functional group will react similarly regardless to the parent carbon chain to which it is attached.This helps in prediction of chemical reactions.
The reactivity of functional group can be enhanced by making modifications in the functional group .Atoms present in functional groups are linked to each other by means of covalent bonds.They are named along with organic compounds according to IUPAC nomenclature.
Functional group inter conversion is also possible by retro -synthesis.In some cases , functional groups can be charged molecules.
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9. Which statement provides evidence that supports the Big Bang Theory?* 2 points
O the universe began as a very high density singularity
Small spiral galaxies become larger elliptical galaxies
Dark matter makes up the majority of matter in the galaxy.
The chemical makeup of the universe has changed dramatically
Answers
The statement the chemical makeup of the universe has changed dramatically provides evidence that supports the Big Bang Theory (Option D).
What is the Big Bang Theory?The Big Bang Theory is a widely accepted theory in physics that states all the universe began with a huge explosion and form then matters expanded in space at the same time that it is cooling.
Therefore, with this data, we can see that the Big Bang Theory states that the chemical composition of the universe associated with hydrogen and helium modified since this explosion.
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Answer:
d
Explanation:
you find the density of an object 4 times 1.3g/ml 1.25g/ml 1.17g/ml and 1.22g/ml now determine the percent deviation from the mean
Answers
Firstly we will determine the average or the mean of the objects density:
[tex]\begin{gathered} Mean=\frac{1.3g•mL^{-1}+1.25g•mL^{-1}+1.17g•mL^{-1}+1.22g•mL^{-1}}{4} \\ Mean=\frac{4.94g•mL^{-1}}{4} \\ Mean=1.235 \end{gathered}[/tex]Now we will calculate the deviation. The deviation is how much is trial is different from the average. We take the absolute value so the answers can be positive:
[tex]\begin{gathered} Trial\text{ }1:|1.3-1.235|=0.065 \\ Trial\text{ }2:|1.25-1.235|=0.015 \\ Trial\text{ }3:|1.17-1.235|=0.065 \\ Trial\text{ }4:|1.22-1.235|=0.015 \end{gathered}[/tex]We will determine the average of the deviation:
[tex]\begin{gathered} Deviation\text{ }mean=\frac{0.065+0.015+0.065+0.015}{4} \\ Deviation\text{ }mean=0.04 \end{gathered}[/tex]To determine the percent deviation we:
[tex]\begin{gathered} \%\text{ }deviation=\frac{mean\text{ }deviation}{mean}\times100 \\ \\ \%\text{ }deviation=\frac{0.04}{1.235}\times100 \\ \\ \%\text{ }deviation=3.24\% \end{gathered}[/tex]Answer: The percent deviation from the mean is 3.24%,
9. Determine the percent compositions for each of the following compounds. a. Ba(OH)2 b. copper (I) oxide C. Fe(C2H3O2)3 d. iron (III) nitrate hexahydrate (*see notes on backside to help with the hexahydrate part)
Answers
Answer:
Iron 24.03%
Carbon 30.90%
Hydrogen 3.86%
Oxygen 41.20 %
Explanation:
Here, we want to get the percentage composition of the given compound
What this means is that we want to get the percentage composition of each of the elements present in the compound
Firstly, we calculate the molar mass of the given compound
We can calculate the molar mass by adding the atomic masses of the elements and their multiplicities
Mathematically, we have that as:
[tex]\begin{gathered} 56\text{ + 3\lparen2\lparen12\rparen + 3\lparen1\rparen +2\lparen16\rparen\rparen} \\ =\text{ 56 + 3\lparen24+3+32\rparen} \\ 56\text{ + 177 = 233 g/mol} \end{gathered}[/tex]Now, let us get the percentage compositions
For Iron, we have:
[tex]\frac{56}{233}\times\text{ 100 \% = 24.03 \%}[/tex]For Carbon, we have:
[tex]\frac{72}{233}\times\text{ 100 \% = 30.90 \%}[/tex]For Hydrogen, we have:
[tex]\frac{9}{233}\times\text{ 100 \% = 3.86 \%}[/tex]For Oxygen, we have:
[tex]\frac{96}{233}\times\text{ 100 \% = 41.20\%}[/tex]HELP PLEASEEEEE!!!!!!
Answers
Organism – Squid
Number of chromosomes after meiosis: 26
Number of chromosomes in the body cells: 52
Number of chromosomes in gametes: 26
Number of chromosomes after mitosis: 52
Organism – Sunflower
Number of chromosomes after meiosis: 19
Number of chromosomes in the body cells: 38
Number of chromosomes in gametes: 19
Number of chromosomes after mitosis: 38
Organism – Pea plant
Number of chromosomes after meiosis: 7
Number of chromosomes in the body cells: 14
Number of chromosomes in gametes: 7
Number of chromosomes after mitosis: 14
Organism – Cow
Number of chromosomes after meiosis: 30
Number of chromosomes in the body cells: 60
Number of chromosomes in gametes: 30
Number of chromosomes after mitosis: 60
Chromosome are made up of genetic material called DNA and it looks like a thread. It is present in the inside of nucleus of a cell.
During meiosis number of chromosomes would be reduced to half whereas in mitosis number of chromosomes remains the same.
The number of chromosomes in body cells is the chromosomal number of an organism and in gametes it would be reduced to half.
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how did democritus model change throughout history write a paragraph using other theories about atoms.
Answers
Democritus proposed the idea that atoms were unique to the substance they were found .
How has the atomic model evolved through time?Model of Bohr (1913)
Niels Bohr made Rutherford's model better. He demonstrated, using mathematical concepts, that electrons reside in energy levels or shells surrounding the nucleus. Due to the discovery of subatomic particles, the Dalton model has evolved over time.
The importance of the atomic theoryAstonishing scientific advancements in fields like contemporary chemistry and nuclear energy resulted from the finding that all matter is composed of microscopic particles, which was made possible by the atomic theory.
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A piece of magnesium ribbon is reacted with excess hydrochloric acid to produce aqueous magnesium chloride
and hydrogen gas. The volume of the dry hydrogen gas produced is 45.6 milliliters. The temperature of the gas
is 293 K, and the pressure is 99.5 kilopascals.
Balance the given equation using the smallest whole number coefficients.
___Mg(s) + ___HCl(aq) →> ___MgCl₂(aq) + ____H₂(g)
Answers
The balanced chemical equation between magnesium and hydrochloric acid is Mg + 2 HCl[tex]\rightarrow[/tex] MgCl₂ + H₂
What is a chemical equation?Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .
The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.
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Metals reacts with hydrogen halides to produce metallic halides easily and the reaction evolves hydrogen gas. The balanced reaction of Mg and HCl is written as follows:
[tex]Mg (s) + 2HCl \rightarrow MgCl_{2} (aq)+ H_{2}(g)[/tex]
What is a balanced reaction?A balanced reaction is represented by a chemical equation, in which each elements are equal in number on both side of the reaction. Thus the coefficients of reactants must be in proper stoichiometric ratios.
Metals easily reacts with hydrogen halides such as HCl, HBr, HF etc to form their metal halides. This reaction evolves hydrogen gas. Metals are highly electropositive and they can donate electrons to the electronegative atoms such as Cl.
In the given reaction, there are 2 hydrogens and two chlorines in the product side. Thus We have to multiply HCl by 2. Thus, there will be equal number of hydrogens in both side and similar for Mg and chlorines.
Therefore, the balanced reaction is :[tex]Mg (s) + 2HCl \rightarrow MgCl_{2} (aq)+ H_{2}(g)[/tex]. and the whole number coefficients are 1,2,1,1.
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In the titration of 64.0 mL of 0.400 M HCOOH with 0.150 M LiOH, how many mL of LiOH are required to reach the halfway point?
Answers
The volume of the base, LiOH required to reach the halfway point will be 170.6 mL.
The balanced chemical equation for this reaction will be:
HCOOH +LiOH → HCOOHLi + [tex]H_{2}O[/tex]
It can be observed that,
The mole ratio of HCOOH ([tex]n_{a}[/tex], acid) = 1
The mole ratio of LiOH ([tex]n_{b}[/tex], base) = 1
Volume of acid, HCOOH ([tex]V_{a}[/tex] = 64.0 mL
Molarity of acid, HCOOH ([tex]M_{a}[/tex]) = 0.4 M
Molarity of base, LiOH ([tex]M_{b}[/tex]) = 0.150 M
The volume of a base can be determined by the formula:
Ma×Va / Mb ×Vb = nA / nB.....(i)
Now, put the given data in above formula:
(0.4 × 64) / (0.150 × [tex]V_{b}[/tex]) = 1
25.6 / (0.150 × [tex]V_{b}[/tex]) = 1
By solving it:
0.150 × [tex]V_{b}[/tex] = 25.6
[tex]V_{b}[/tex] = 25.6 / 0.150
[tex]V_{b}[/tex] = 170.6 mL
Therefore, the volume of the LiOH required to reach the halfway point will be 170.6 mL.
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How many grams of calcium fluoride are in 1.5 moles of calcium fluoride?
Answers
The number of grams of calcium fluoride in 1.5 moles of calcium fluoride is 88.5grams.
How to calculate mass?The mass of a substance or compound can be calculated by multiplying the number of moles of the substance by its molar mass as follows:
mass = no of moles × molar mass
According to this question, there are 1.5 moles of calcium fluoride (CaF). The molar mass of calcium fluoride can be calculated as follows:
CaF = 40g/mol + 19g/mol = 59g/mol
mass = 59g/mol × 1.5mol
mass = 88.5grams.
Therefore, 88.5grams of calcium fluoride is present in 1.5 moles of the compound.
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What is the number of molecules in
500m cube of Oxygen at room temperature
Answers
4.95 is the number of molecules in 500m cube of Oxygen at room temperature and pressure
we have got data
pressure=1atm
temperature=298 k
volume=500 m^3
gas constant, R=8.31
now, by applying ideal gas equation
PV=nRT
1×500=n×8.31×298
n=2476.38/500
n=4.95
It is the lowest part of the material and has chemical elemental properties. Atoms do not independently exist; rather, they combine to form ions and molecules, which then combine to form the material that we can see, feel, and touch.
Molecules are made up of one or more atoms connected by covalent (chemical) connections. Atoms can be visualized as circles with a nucleus in the center (made up of protons and neutrons) and one or more concentric circles around it that indicate the "shells" or "levels" in which the electrons surrounding the atom's nucleus are located, as well as markings that identify the electron. each level
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What is the difference between concentrated and dilute with strong and weak?
Answers
The strength is a measure of the degree of ionization of a substance in an aqueous solution.
Some substances are strong and they dissociate completely (this is the case of hydrochloric acid, HCl, in water), some are weak and they do not dissociate completely (like acetic acid, CH3COOH).
The concentration is a measure of the amount of the substance in a solution and it is usually explessed in moles or percentage. It is a ratio of the substance to the solvent. A concentrated solution is a solution with a high percentage of the substance (solute) in the solution, and a dilute one is a solution with a low percentage of solute.
fig. 15 shows a simplified diagram of the electrolysis of a molten electrolyte containing lithium chloride. b. Describe how the electron configuration of each lithium ion changes when it arrives at the cathode. You may draw a diagram to help you answer this question.
Answers
During the electrolysis of the molten lithium chloride, the Lithium ions (Li⁺) at the cathode undergoes reduction, and the electron configuration of lithium becomes 1s²2s¹.
What is electrolysis?Electrolysis can be described as the process in which the electric current is passed through the chemical compound to break them. In this process, the atoms and ions are interchanged by the addition or removal of electrons.
The ions are allowed to move freely in this process. When an ionic compound is melted or dissolved in water then ions are produced which can move freely.
During the electrolysis of molten lithium chloride, the lithium ions reach the cathode and accept the electrons while chloride ions reach at anode and loss electrons to become chlorine gas.
At anode : 2 Cl⁻ → Cl₂ + 2e⁻
At cathode: 2 Li⁺ + 2e⁻ → Li
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Which statement describes how a macroscopic property of gases provides information about microscopic gas particles?A. Gases fill their container, showing that gas particles are not tied together and can move far apart.B. Gases fill their container, showing that gas particles are strongly attracted through electrostatic forces.C. Gases have a fixed volume, showing that gas particles are strongly attracted through electrostatic forces.D. Gases have a fixed volume, showing that gas particles are not tied together and can move far apart.
Answers
It's important to know that gases don't have a defined volume as solids do because they don't have a definite shape.
Also, gas partcles are not tied together because their intermolecular forces are weak, this enables them to travel away one from another.
Therefore, the answer is A.
The following lists consists of ionic compounds EXCEPT
barium hydroxide, zinc carbonate, ammonium sulfate
calcium chloride, carbon disulfide, magnesium nitrate
sodium sulfate, copper(II) oxide, potassium nitride
aluminium sulfide, sodium sulfite, calcium fluoride
Answers
Except for NACLE, the is made up of ionic compounds. Carbon disulfide bonds are not ionic due to their weak and trivial polarity. Carbon disulfide bonds are covalent due to the small difference in electronegativities of carbon and sulfur.
What makes an ionic bond?Ionic bond, also known as electrovalent bond, is a type of linkage formed in a chemical compound by the electrostatic attraction of oppositely charged ions. When the valence (outermost) electrons of one atom are permanently transferred to another, a bond is formed.After two or more atoms lose or gain electrons to form an ion, an ionic bond can form. Ionic bonds form when metals lose electrons and nonmetals gain electrons. Ions with opposite charges attract each other, forming an ionic bond.To learn more about Ionic Bond, refer to:
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A solution is prepared by mixing 500. mL of 0.10 M NaOCl and 500. mL of 0.20 M HOCl. What is the pH of this solution? [Ka(HOCl) = 3.2 × 10–8 ]
Answers
The pH of the solution is calculated as 7.2.
What is the pH of the solution?Let us recall that we can make us of the Henderson–Hasselbalch equation
to obtain the pH of the solution if we would follow the steps that have been itemized below.
Number of moles of the acid = 500/1000 L * 0.20 M = 0.1 moles
Number of moles of salt = 500/1000 L * 0.1 M = 0.05 moles
Total volume of the solution = 500 mL + 500 mL = 1000 mL or 1L
Now;
Molarity of the acid = 0.1 moles/1 L = 0.1 mol L-1
Molarity of the salt = 0.05 moles/1 L = 0.05 molL-1
Then we apply the equation;
pH = pKa + log[(A-)/(HA)]
pKa = - log (Ka) = - log(3.2 × 10^–8) = 7.5
Thus we have;
pH = 7.5 + log (0.05/0.1)
pH = 7.5 - 0.3
pH = 7.2
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