Let's analyze each option to find what best fit as an answer:
A - the function of a catalyst is to lower the energy of activation in a reaction, causing it to occur in a faster way. Since this question is not much about energy or kinetics, this would be the best fit, adding a catalyst or not adding it would not be too influential in the shift of the reaction.
B - Increasing the pressure in a reaction containing gases will mostly favor the side with a lower value of moles, smaller amount of moles = less pressure, so if we add more pressure, the reaction will shift towards the side of the products
C - If we treat heat as a reactant, if we add more temperature, it will shift towards the products, to counteract this increase of temperature
D - Adding reactants will favor the reaction to shift towards the products
Therefore the answer is letter A
-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
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
What is the theoretical yield, in grams, of CO₂, if 29.9 g of C₂ H₂ completely reacts?
The theoretical yield, in grams, of CO₂ is 93.97g having molar mass 44g
What is molar mass ?
The "counting unit" used by chemists to describe the quantity of atoms, ions, molecules, or formula units in a specific chemical sample is called a mole. The mole is comparable to other counting units you have employed in the past, such as pair (2), dozen (12), and gross (144). Avogadro's number (6.022 x 1023) of molecules (or formula units) make up one mole of a substance (ionic compound). The mass of 1 mole of a chemical is indicated by its molar mass. It provides you with the amount of grammes per mole of a substance, to put it another way. Therefore, grams/mole are the units for molar mass.
2C2H2 + 5O2=====> 4CO2+2H2O
Molar Mass of C2H2 = 2*12+2*2 = 28g = 1 mol
2 mol of C2H2 = 28*2 = 56g
Molar Mass of CO2 = 12+2*16 = 44g = 1 mol
4 mol of CO2 = 4*44 = 176g
56g of C2H2 gives 176g of CO2
29.9g of C2H2 gives 176*29.9/56g of CO2
= 93.97g of CO2
The theoretical yield, in grams, of CO₂ is 93.97g having molar mass 44g
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9) How many ATOMS of fluorine are there in 3.71 moles of nitrogen trifluoride (NF3)? (Hint: this requires two conversions)
The number of atoms of fluorine present in 3.71 moles of nitrogen trifluoride, NF₃ is 6.7×10²⁴ atoms
How to determine the number of atomsWe'll begin by obtaining the number of moles of fluorine in 3.71 moles of nitrogen trifluoride NF₃. This can be obtained as follow:
1 mole of nitrogen trifluoride, NF₃ contains 3 moles of F
Therefore,
3.71 moles of nitrogen trifluoride, NF₃ will contain = 3.71 × 3 = 11.13 moles of F
Finall, we shall determine the number of atoms of fluorine pressnt in the compound as follow:
From Avogadro's hypothesis,
1 mole of fluorine = 6.02×10²³ atoms
Therefore,
11.13 moles of fluorine = (11.13 moles × 6.02×10²³ atoms) / 1 mole
11.13 moles of fluorine = 6.7×10²⁴ atoms
Thus, from the calculations made above, we can conclude that the number of atoms of fluorine present is 6.7×10²⁴ atoms
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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!
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
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
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:
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?
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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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.
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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Convert 8.75X10^-4 to regular number
To convert the given number to regular notation, we have to move the decimal dot as many times as indicated by the exponent of 10. In this case, that exponent is -4, so we have to move the decimal dot 4 times to the left:
It means that the answer is 0.000875.
Jade throws a horseshoe toward a stake from the same starting point three different times. She tries to throw the horseshoe with the same amount of force each time. Jade measures the distance each horseshoe lands from the stake. Which distances did Jade likely measure?
Responses
100 in., 200 in., 300 in.
5 in., 25 in., 50 in.
2 in., 100 in., 120 in.
11 in., 12 in., 13 in
Since Jade tried to throw the horseshoe with the same amount of force, the likely distances that Jade measured would be 11 in., 12 in., 13 in. The last option.
Force and distanceThe distance that the horseshoe thrown by Jade travels is a measure of the amount of force that she applies. The more the force, the longer the distance.
However, Jade tried to ensure that the same amount of force is used the 3 times she threw the horseshoe. The consequence is that the distance of the horseshoe from the stake will not vary much in all the 3 throws.
If the distances vary significantly, it means the amount of force used by Jade also differs significantly.
Thus, the only distances that could be a reflection of the relatively constant force used by Jade to throw the horseshoe are 11 in., 12 in., 13 in.
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ions can travel directly from the cytoplasm of one animal cell to the cytoplasm of an adjacent cell through _____.
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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How many grams of calcium fluoride are in 1.5 moles of calcium fluoride?
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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April investigated a crime scene where a gunshot sent blood through the air and it splattered on the wall. How would a forensic scientist BEST categorize this blood stain?
A.
transfer
B.
impact
C.
circular
D.
passive
The forensic scientist best categorize this blood stain by impact. Thus option B is correct.
What is forensic science?Forensic science is defined as the application of science to criminal and civil laws, with a focus on the criminal side during a criminal investigation as defined by the legal requirements of admissible evidence and criminal procedure.
There are various laws and principles of forensic science.
The laws of individuality and progressive change.Lockard's Exchange PrinciplePrinciple of Comparison: This law is crucial for laboratory investigations.Analytical Principle.The law of probabilityCircumstantial facts lawThus, the forensic scientist best categorize this blood stain by impact. Thus option B is correct.
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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)
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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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: ________
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]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?
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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Which process is not reversible?Dissolving sugar in water Burning butane in a candle lighterMelting waxExtracting iron metal from iron (III) oxide
Answer
The process that is NOT reversible is Burning butane in a candle lighter
Explanation
All other processes can be reversed
can someone please help me with 28 A!
Answer: The answer for 28 A is [tex][He]2s^2 2p^2[/tex]
28 B is [tex]1s^2 2s^2 2p^1[/tex]
HELP PLEASEEEEE!!!!!!
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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What is 4.8829g + 121.3 g + 9.384 g . ensure your answer confiding to rules regarding significant figures
Answer:
[tex]135.6g[/tex]Explanation:
Here, we want to sum the given values, then give an answer to the correct significant figures
The correct significant figure for addition operation is the significant figure of the number that has the lowest count of values after the decimal places
Looking at the values, the number with the lowest significant figure after the decimal value is 121.3
Thus, our answer will have a value with 1 significant figure after the decimal place
We have it that:
[tex]\begin{gathered} \text{ 4.8829 + 121.3 + 9.384 = 135.5669g} \\ which\text{ finally is:} \\ 135.6g \end{gathered}[/tex]
Consider the reaction: 2H2₂0 +
energy --> 2H2 + O₂
exothermic because absorbing
energy
endothermic because absorbing
energy
endothermic because releasing
energy
exothermic because releasing
energy
Explanation:
endothermic because absorbing
energy
H2O is absorbing heat to release hydrogen and oxygen gas. any reaction that requires energy from outside is endothermic.
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.
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.
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)
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]What is the difference between concentrated and dilute with strong and weak?
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.
Which of the following statements is true? *
The stronger the acid the easier the H+ ions dissociate in solution.
The weaker the acid the easier the H+ ions dissociate in solution.
The stronger the base the easier the H+ ions dissociate in solution.
O The weaker the base the easier the H+ ions dissociate in solution.
4 points
The stronger the acid the easier the H+ ions dissociate in solution of the following statements is true.
The correct option is A.
Does a stronger acid dissociate more?Because it almost entirely dissociates, HCl is a powerful acid. A weak acid, such as acetic acid (CH₃COOH), on the other hand, does not dissociate easily in water because numerous H+ ions are still locked up inside the molecule. In conclusion, more free H+ ions are liberated into solution with stronger acids.
Why do more stronger acids than weak acids dissociate?Strong acids (and bases) are completely dissociated into ions, which is the cause of this. In comparison to weak acids (and bases) of comparable concentrations, they therefore supply more ions for conductivity. An illustration is the complete ionization of a 0.1 M hydrochloric acid solution.
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The complete question is -
Which of the following statements is true?
A-The stronger the acid the easier the H+ ions dissociate in solution.
B-The weaker the acid the easier the H+ ions dissociate in solution.
C-The stronger the base the easier the H+ ions dissociate in solution.
D-The weaker the base the easier the H+ ions dissociate in solution.
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)
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.
Which diagram shows the correct way to represent an ionic compound of magnesium oxide?
Answer:
C.
Explanation:
The correct way to write the diagram of an ionic compound is:
- Use brackets by writing inside them, the symbol of each element separately.
- Draw the symbol and the number o the charge of each one, negative (-) add positive +()., in this case it is +1 for Mg (because Mg lost an electron) and -1 for O (because O won an elec).
2- The vapor pressure of water at 80°C is 355 torr, Calculate the vapor
pressure of an aqueous solution made by dissolving 50 gm of ethylene
glycol (C₂H5O₂) in 50 gm of water. What is the vapor pressure lowering of
water in this solution?
The vapor pressure lowering of water in this solution is 1165 torr.
What is vapor pressure?
The pressure that a vapour exerts on its condensed phases in a closed system at a specific temperature is known as the vapour pressure or equilibrium vapour pressure. An indicator of a liquid's evaporation rate is the equilibrium vapour pressure. It has to do with how easily liquid-borne particles tend to elude detection (or solid). Volatile is a term used to describe a chemical that, at room temperature, has a high vapour pressure. Vapor pressure is the force that a vapour cloud exerts over a liquid surface. The kinetic energy of a liquid's molecules increases along with the temperature. The number of molecules vaporising also rises as a function of the molecules' rising kinetic energy, which raises the vapour pressure.
the vapor pressure of water and the mixture is 355 torr and 760 torrs. Therefore, the value of vapor pressure of oxygen would be,
Ptotal=PO2+PH2O
760=PO2+355
760−355=PO2
405=PO2
So, at the temperature, the vapor pressure of Ethylene is 405 torr.
When volume reduces to 50ml, the pressure of the oxygen would be,
P1V1=P2V2
where P1 and P2 are the pressure and V1 and V2 are the volumes.
P1V1=P2V2
P1V1/V2=P2
405×100 / 50=P2
810=P2
So, when the volume is 50ml the vapor pressure of the oxygen is 810 torr.
Now the total pressure of water-saturated oxygen at 50 ml volume is,
Ptotal=PO2+PH2O
Ptotal=810+355
Ptotal=1165
So, the total vapor pressure is 1165 torr.
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how did democritus model change throughout history write a paragraph using other theories about atoms.
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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What mass of oxygen can be obtained from heating 163.27G of potassium chlorate?
Step 1
The reaction involved:
2 KClO3 => 2 KCl + 3 O2 (completed and balanced)
------------
Step 2
Data provided:
Mass of KClO3 = 163.27 g
---
Data needed:
The molar mass of:
KClO3) 122.6 g/mol
O2) 32.00 g/mol
-------------
Step 3
Procedure:
By stoichiometry,
2 KClO3 => 2 KCl + 3 O2
2 x 122.6 g KClO3 ------ 3 x 32.00 g O2
163.27 g KClO3 ------ X
X = 163.27 g KClO3 x 3 x 32.00 g O2/2 x 122.6 g KClO3
X = 63.92 g
Answer: 63.95 g (the nearest value)
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.
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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