Answer:
4.5 moles H₂O
or
81.072 g H₂O
Explanation:
I am not exactly sure whether you want moles H₂O or grams H₂O. So, I'll calculate both. To find the moles H₂O, you'll need to covert moles C₈H₁₈ to moles H₂O via the mole-to-mole ratio from the reaction coefficients. To find the grams H₂O, you need to convert moles H₂O to grams H₂O via the molar mass.
2 C₈H₁₈ + 25 O₂ ---> 16 CO₂ + 18 H₂O
0.5 mole C₈H₁₈ 18 moles H₂O
----------------------- x ------------------------- = 4.5 moles H₂O
2 moles C₈H₁₈
Molar Mass (H₂O): 2(1.008 g/mol) + 16.00 g/mol
Molar Mass (H₂O): 18.016 g/mol
4.5 moles H₂O 18.016 g
---------------------- x ---------------- = 81.072 g H₂O
1 mole
45.8 grams of copper requires 1172 J of heat to reach a final temperature of 100.5 ℃. What was the initial temperature? Specific heat of copper is 0.385 J/g℃.
A. 66.5[?][?][?]
B. 122[?][?][?]
C. 34.0[?][?][?]
D. 75.2[?][?][?]
I also have no idea what the [?][?][?] is. Can someone please help me for 20 points? I desperately need help. No nonsense answers either, and show the steps pls. :')
Answer:
Option A, 66.5
Explanation:
use q (heat) = m(mass) * cp(specific heat) * deltat (change in temp)
q= 1172, m = 45.8, cp = 0.385
1172= (45.8) * (0.385) * Delta T
1172= 17.633 *DeltaT
1172/17.633 =DeltaT
66.5 =DeltaT
How many sublevels inn the second energy level?
There are two subshells that are s and p, which are present in the second energy level.
The energy level can be defined as the fixed distances from the nucleus of an atom where electrons may be found. Each energy level is divided into some Subshells. These subshells are known as s-subshell, p-subshell, d-subshell, and f-subshell. This subshell contains some orbitals, these orbitals are the place where there is the maximum probability of getting the electrons. In one orbital, a maximum of two electrons can be present.
Hence, there are two subshells in the second energy level.
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Q2. Name, constituent of petroleum (Petrochemicals) which is used for following purposes.
(i) To make candles.
(ii) A solvent for dry cleaning
(iii) For surfacing roads.
(iii) Jet engine fuel.
(v) For lubrication.
The constituents of petroleum that are used for the following purposes are as follows:
To make candles ----- Paraffin waxA solvent for dry cleaning ----- PetrolFor surfacing roads ----- BitumenJet engine fuel ----- KeroseneFor lubrication ----- Lubricating oil.What are the constituents of petroleum?The constituents of petroleum are LPG, bitumen, paraffin wax, lubricating oil, kerosene, diesel, etc. These compounds are a mixture of hydrocarbons.
Therefore, each constituent of petroleum that is used for the following purposes is mentioned above with proper names.
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Which term describes this reaction?
Answer:
addition polymerization
Explanation:
q5:- Some green food colouring was carefully added to the bottom of a beaker of water using a syringe. The beaker was then covered and left untouched for several days.
Describe what would you observe after:-
a)
i) a few hours
ii) several days
b) explain your answer to question 5a using ideas of the kinetic particle theory.
c) state the physical process that takes place in this experiment.
The molecules of the green food coloring would disperse throughout the water.
Diffusioni) In a few hours, the molecules of the green food coloring would have started dispersing throughout the water from the region of higher concentration to the region of lower concentration.
ii) In several days, the molecules would have uniformly dispersed through the water.
b) According to the kinetic theory of particles, matters, irrespective of their nature, are made up of small molecules that are in constant random motion. The direction and pace of movement depend on the energy they possess as well as the kind of relationship that exists between the small molecules.
c)The process that takes place in the experiment is known as diffusion.
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Help pls!!
The table compares the number of electrons in two unknown neutral atoms.
Comparison of Electrons
Atom Number of Electrons
A 10
D 11
Use this information to determine the number of valence electrons in the atoms. Which of the following correctly compares the stability of the two atoms?
A Both are unreactive.
B Both are highly reactive.
C A is unreactive and D is reactive.
D A is reactive and D is unreactive.
Answer: A is unreactive and D is reactive.
Explanation:
A is neon, which is a noble gas, and thus unreactive.
D is sodium, which is an alkali metal, and thus highly reactive.
Add distilled water to the beaker until the volume
totals 15 mL.
Record the amount of sodium chloride that
dissolved.
Ionic compounds such as sodium chloride, which dissolve in water and dissociate to form ions, are called electrolytes.
What are electrolytes?Electrolytes are substances that have a natural positive or negative electrical charge when dissolved in water.
Water molecules pull the sodium and chloride ions apart, breaking the ionic bond that held them together. After the salt compounds are pulled apart, the sodium and chloride atoms are surrounded by water molecules, as this diagram shows. Once this happens, the salt is dissolved, resulting in a homogeneous solution.
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explain why nickel is a good conductor of heat
Answer:
Its a good conductor because its a metal
Answer:
periodic table
Explanation:
in its magnetic properties and chemical activity it resembles iron and cobalt
Escriba la formula de:
5) Ácido -3,3-dimetil-Pentinoico
6) 3-etil-6-Heptenoato de propilo
7) Bromuro de 2,3,3-trimetil--5--Hexenoilo
8) N,N-dimetil-2-metil-3-fenil-Butanamida
9) 2-etil-2,5-Octadienal
10) 2,3,3-trimetil-5-Hexinamida
Answer:
Translate your language to EnglishWhat temperature is absolute zero?
OA. 0°C
OB. OK
O
C. 0°F
D. O molecules
Answer: 0 K
Explanation:
This is a fact - absolute zero is defined as 0 degrees Kelvin.
an experiment illustrating fizzy drink production
Beverly and Carl are in a race. Their graphs show the data.
A graph with horizontal axis time (seconds) and vertical axis velocity (meters per second). An orange line labeled Beverly starts at 0 seconds 0 meters and goes straight to 10 seconds 15 meters and then to 50 seconds 35 meters. A blue line labeled starts at 0 seconds 0 meters and goes straight to 10 seconds 10 meters and then to 50 seconds 30 meters.
Which best describes the race?
Given the data, the correct statement is
Even though for a majority of the race they accelerated at the same rate, Beverly won because her initial acceleration was greater than Carl’s
What is acceleration?This is defined as the rate of change of velocity which time. It is expressed as
a = (v – u) / t
Where
a is the acceleration v is the final velocity u is the initial velocity t is the time How to determine the initial acceleration of BeverlyInitial velocity (u) = 0 m/sFinal velocity (v) = 15 m/sTime (t) = 10 sInitial acceleration (a₁) =?a₁ = (v – u) / t
a₁ = (15 – 0) / 10
a₁ = 1.5 m/s²
How to determine the final acceleration of BeverlyInitial velocity (u) = 15 m/sFinal velocity (v) = 35 m/sTime (t) = 50 - 10 = 40 sFinal acceleration (a₂) =?a₂ = (v – u) / t
a₂ = (35 – 15) / 40
a₂ = 0.5 m/s²
How to determine the initial acceleration of CarlInitial velocity (u) = 0 m/sFinal velocity (v) = 10 m/sTime (t) = 10 sInitial acceleration (a₁) =?a₁ = (v – u) / t
a₁ = (10 – 0) / 10
a₁ = 1 m/s²
How to determine the final acceleration of CarlInitial velocity (u) = 10 m/sFinal velocity (v) = 30 m/sTime (t) = 50 - 10 = 40 sFinal acceleration (a₂) =?a₂ = (v – u) / t
a₂ = (30 – 10) / 40
a₂ = 0.5 m/s²
SUMMARY
Initial acceleration of Beverly = 1.5 m/s²Final acceleration of Beverly = 0.5 m/s²Initial acceleration of Carl = 1 m/s²Final acceleration of Carl = 0.5 m/s²From the above calculations, we can see that Beverly's initial acceleration is higher than that of Carl's and their final acceleration is the same.
Therefore, the correct answer to the question is:
Even though for a majority of the race they accelerated at the same rate, Beverly won because her initial acceleration was greater than Carl’s
Complete question
See attached photo
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Answer:
B) hope this helped.
-----------------------------
on edgy 2022
Explanation:
The expression caco3 → cao co2 is an example of a reactant. product. chemical equation. chemical progression.
Chemical equation
What is a chemical equation?The reactants and products of a chemical reaction are represented symbolically in a chemical equation by the appropriate chemical formulas.A chemical equation that illustrates how Calcium oxide (quicklime) and carbon dioxide are produced during the breakdown of limestone.CaCo3 → CaO+ CO2 (Decomposition reaction)
The portion of the chemical equation on the reactant side is to the left of the symbol "→," and the portion on the product side is to the right of the arrow symbol.Decomposition reaction:-A chemical reaction that results in the breakdown of one reactant into two or more products is known as a decomposition reaction.
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Answer:
chemical equation
Explanation:
explain the bonding nature in NaCl with diagram
Explanation:
NaCl is the compound that we want to know the Bonding structure of
in chemistry when a metal (Na) combines with a non metal (Cl) it is know as an ionic compounds
the type of bonding in ionic compounds is an ionic bond
the mr-vp tests are part of a battery of tests called imvic tests. these tests are useful in identifying and differentiating:
the mr-vp tests are part of a battery of tests called imvic tests. these tests are useful in identifying and differentiating Gram-positive cocci.
What is mr-vp tests?mr-vp tests can be regarded as a test that is used in the determination of fermentation pathway that is required in glucose.
It is used in mixed acid fermentation pathway and can be used in identifying and differentiating Gram-positive cocci.
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Look at pic and help
Answer:
Answer
Explanation:
1) Other gasses / or argon (based on what u took in ur school )
2) oxygen
3? Nitrogen
Answer:
By volume, the dry air (which i'm assuming that's what either the blue or red is) in Earth's atmosphere is about 78.09 percent nitrogen, and 0.93 percent argon (which might be what red is (if the red isn't dry air)). A brew of trace gases accounts for the other 0.03 percent (which I think that might be the yellow), including the greenhouse gases carbon dioxide, methane, nitrous oxide and ozone.
Explanation:
if the temperature of this equilibrium was increased, what would happen to the equilibrium yield of chlorine?
Answer:
the temperature of the system decreases
You are trying to determine the
mass of sodium chloride required to
create a 0.875 m solution in 534 g of water. How many moles of NaCl are required?
[?] mol NaCl
The number of mole of NaCl required to prepare the solution is 0.467 mole
What is molality?The molality of a solution is simply defined as the mole of solute per kilogram of water. It is expressed mathematically as
Molality = mole / mass (Kg) of water
How to determine the mole of NaCl requiredMolality = 0.875 MMass of water = 534 g = 534 / 1000 = 0.534 KgMole of NaCl =?Molality = mole / mass (Kg) of water
0.875 = mole of NaCl / 0.534
Cross multiply
Mole of NaCl = 0.875 × 0.534
Mole of NaCl = 0.467 mole
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state and explain the trend in electronegativity values across period 3 from sodium to chlorine
The trend in electronegativity values across period 3 from sodium to chlorine is that sodium with 11 protons is the least electromagnetic element and chlorine with 17 protons is the most electronegative element.
What is electronegativity?It should be noted that electronegativity simply means a chemical property that describes the tendency of an atom to attract elements towards it.
In this case, the trend in electronegativity values across period 3 from sodium to chlorine is that sodium with 11 protons us the least electromagnetic element and chlorine with 17 protons is the most electronegative element.
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What is surface tension? Describe how surface tension in water is useful for plants and animals.
This is not multiple choice, I need help please :')
It is a tension created by the attraction of molecules to the surface by the molecules in a bulk of a solution.
The attraction force present between water molecules is cohesion force.
The phenomenon of surface tension provides two major characteristics to the water:
It makes the surface molecules to be held together Responsible for formation of water dropletPlants take water from soil using it's roots , and water is travelling through the xylene tissues present in a plant , so the cohesion forces present in water helps it to travel to the higher places in plants.
While in case of animals, this attraction forces increases the surface density which helps to insects to walk on to the water surface.
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a fossil contains c14 and n14 in the ratio of 1:3 how old is the bone
Answer:
Approximately 11460 Years Old
Explanation:
i looked this up :/
way to much maths for me
The age of the bone given that it contains C-14 and N-14 in ratio of 1:3 is 11460 years
How to determine the percentage remainingC-14 is usually used for radioactive dating (i.e to determine the aga of substance)
From the question, C-14 and N-14 exist in ratio of 1:3.
thus, the amount of C-14 remaining can be obtained as follow:
Ratio of C-14 = 1Ratio of N-14 = 3Total ratio = 1 + 3 = 4Percentage of C-14 remaining =?Percentage of C-14 remaining = 1/4 × 100
Percentage of C-14 remaining = 25%
How to determine the number of half-lives that has elapsedOriginal amount (N₀) = 100%Amount remaining (N) = 25%Number of half-lives (n) =?2ⁿ = N₀ / N
2ⁿ = 100 / 25
2ⁿ = 4
2ⁿ = 2²
n = 2
How to determine the ageHalf-life of C-14 (t½) = 5730 yearsNumber of half-lives (n) = 2Time (t) = ?t = n × t½
t = 2 × 5730
t = 11460 years
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What type of reaction is: ammonium nitrate -> dinitrogen monoxide + water?
A. Double Replacement
B. Combustion
C. Synthesis
D. Decomposition
Answer: Decomposition
Explanation:
Decomposition reactions involve a substance breaking down into simpler substances.
a sample of helium gas has a volume of 1.00 l. what is the final volume if both the pressure and kelvin temperature each double?
Since the helium gas has a volume of 1.00 L, the final volume of the helium gas is 1.00 L
To find the volume, we need to know the general gas law.
What is the general gas law?The general gas law is given by P₁V₁/T₁ = P₂V₂/T₂ where
P₁ = initial pressure of gas, V₁ = initial volume of gas, T₁ = initial temperature of gas in Kelvin, P₂ = final pressure of gas, V₁ = final volume of gas, andT₁ = final temperature of gas in KelvinFinal volume of helium gasSo, making V₂ subject of the formula, we have
V₂ = P₁V₁T₂/T₁P₂
Since the sample of helium gas has a volume of 1.00 L and both the pressure and kelvin temperature each double, we need to find its final volume.
So,
P₂ = 2P₁, T₂ = 2T₁ and V₁ = 1.00 LSo, substituting the values of the variables into the equation, we have
V₂ = P₁V₁T₂/T₁P₂
V₂ = P₁V₁ × 2T₁/T₁ × 2P₁
V₂ = V₁
V₂ = 1.00 L
So, the final volume of the helium gas is 1.00 L
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classify the following into colloids, suspensions and true solution: soda water,chalk powder,milk,blood,ink,starch solution,sulphur powder in water,egg albumin.
Answer:
Amm is this right (if is it the right so mark me the brainliest pls)
Explanation:
Answer : Solutions- Brine, Soda water. Suspensions- Muddy river water, Chalk water mixture, Milk of magnesia, Smoke in air. Colloids- Milk, Ink, Blood, shaving cream.
This map shows the ages of the Atlantic´s oceanic crust. Which statement is supported by the information on the map?
It is evident from the provided map that the African Ocean is enlarging at a divergent plate boundary. So, the correct option is B.
What is Divergent plate boundary?When two tectonic plates diverge from one another, the area is known as a diverging plate border. New crust forms on the plate margins when the plates divide and magma rises from the mantle to fill the space. The creation of mid-ocean ridges is a result of this process, known as seafloor spreading.
Divergent plate borders can also occur on land, and they can eventually result in the formation of new ocean basins by forming rift valleys. The spreading of the seabed is aided by the divergent limits in the middle of the ocean. A fracture occurs on the ocean floor as plates made of oceanic crust move apart from one another.
Therefore, the correct option is B.
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Your question is incomplete, most probably the complete question is:
This map shows the age of the Atlantic’s oceanic crust. Which statement is supported by the information in the map?
A. The African continental plates are undergoing continental drift.
B. The African Ocean is growing wider at a divergent plate boundary.
C. The seafloor is shrinking along a convergent plate boundary.
D. The seafloor is undergoing subduction under the North America plate.
1. How does the Key change for a weak acid?
2. How would the images change for a weak acid solution of the same concentration? Draw the images and/or
describe with words.
3. Draw the images and/or describe with words a weak acid and a strong acid solution of the greater
concentration? Make any notes that might help you remember.
4. Write the chemical reactions for a weak acid and a strong acid.
5. Is there one type of representation that might be the best one for you to remember information about weak
and strong acids?
6. Make any notes that might help you remember how to compare/contrast the two types.
The weak acid will have fewer ions than the strong acid of similar concentration.
The chemical reactions for a weak acid and a strong acid is given below:
Strong acid: HA → H⁺ + A⁻Weak acid: HA ⇆ H⁺ + A⁻What are strong and weak acids?Strong acids are acids which dissociate completely in solutions. Examples of strong acids are hydrochloric acid and sulfuric acid.
Weak acids are acids which dissociate only partially in solutions. Examples of weak acids are carbonic acid and acetic acid.
Weak acids of a similar concentration to a strong acid have fewer hydrogen ions.
The equation of the dissociation of strong acids and weak acids are given below:
Strong acid: HA → H⁺ + A⁻Weak acid: HA ⇆ H⁺ + A⁻In conclusion, weak acids produce few ions in solution while strong acids fully dissociate into ions in solution.
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Which conclusion is consistent with the following net ionic equation? co2+(aq) + s2-(aq) cos(s)
The conclusion that is consistent with the ionic equation would be that COS (s) is a precipitate.
What is a precipitation reaction?It is a reaction in which 2 soluble salts in aqueous forms react to produce an insoluble salt as one of the reaction's products.
Precipitate products are usually insoluble and can be filtered off using suitable filter paper. In other words, they are solids that are suspended in solution.
Following the ionic reaction, the two reacting ions are in aqueous forms while the product formed is solid.
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Reduction of 9-fluorenone: objective of this lab was to reduce 9-fluorenone (a ketone), to 9-fluorenol (an alcohol) using sodium borohydride as the reducing agent. experimental data: 9-fluorenone: mw 180.20 g/mol mass used 0.6 grams methanol: mw 32.04 g/mol volume used: 6ml density: 0.792 nabh4: mw 37.83 g/mol mass used 0.05 grams 9-fluorenol: mw 182.22 g/mol balanced equation for the reaction is: 4c13h8o nabh4 4ch3oh --> 4c13h10o nab(och3)4 calculate the potential yield (in grams) of 9-fluorenol for 9-fluorenone, methanol and nabh4. from these potential yields identify the limiting reagent and theoretical yield.
9-fluorenone is a limiting reagent and theoretical yield.
What is 9-fluorenol?Fluoren-9-ol is a member of the class of hydroxyfluorenes that is 9H-fluorene substituted by a hydroxy group at position 9.
Inspect stoichiometry of the given reaction as per the balanced equation below:
[tex]4C_{13}H_8O + NaBH_4 + 4CH_3 OH[/tex] → [tex]4C _{13} H _{10} O + NaB(OCH_3 )_4[/tex]
Given weight:
0.6 grams methanol
0.05 grams 9-fluorenol
0.792 [tex]NaBH_4[/tex]
Out of the three reactants, [tex]NaBH_4[/tex] acts as a reducing agent only and hence the reaction can occur only when [tex]NaBH_4[/tex] is present in relatively much smaller amounts. But the yield of the product,9-fluorenol, is not governed by its quantity.
Theoretically, when equimolar amounts of reactants ( 9-fluorenone and methanol ) are taken for reaction in presence of [tex]NaBH_4[/tex] an equivalent quantity of product, 9- fluorine is obtained, as inspected in the above stoichiometric relations. But practically we have used a lesser number of moles of 9-fluorenone than theoretically needed, hence in this case it should serve as the limiting reagent.
9- fluorenone, methanol & [tex]NaBH_4[/tex] are the reactants, while the product 9-fluorenol would be obtained = 0.0033 moles
This would represent the theoretical yield of the product 9-fluorenone, as we have used an excess of methanol thus facilitating the reaction to go to completion.
Hence, 9-fluorenone is a limiting reagent.
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A+gas+at+250k+and+15atm+has+a+molar+volume+12%+less+than+the+perfect+gas+law+character. +calculate+the+compressibility+factor
The compression factor based on the information given is 0.083.
How to calculate the compression factor?The way to calculate the compression factor goes this:
V(ideal) = RT/P
= (0.0821 × 250)/15
= 1.368
V(real) will be:
= V(ideal)/12
= 1.368/12 = 0.114
The compression factor will be:
= 1.368/(12 × 1.368)
= 0.083
Therefore, the compression factor is 0.083.
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What volume of a 3.95 M
potassium chloride solution would
be needed to make 325 mL of a
2.76 M solution by dilution?
[?] mL of 3.95 M KCl
0.227L is the volume of a 3.95 M potassium chloride solution that would be needed to make 325 mL of a 2.76 M solution by dilution.
What are moles?A mole is defined as 6.02214076 × 10^{23} of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.
Moles of KCl in new solution
0.325dm³ x (2.76mol/dm³)
= 0.897mol.
Hence volume needed
0.897mol ÷(3.95mol/dm³)
= 0.227dm³ or 0.227L.
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