higher gas pressure
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What would be the formula of the precipitate that forms when pb(no3)2 (aq) and k2so4 (aq) are mixed?
Baking soda (nahco3) decomposes when it is heated according to the equation below. how many kilojoules of heat are required to decompose 1.96 mol nahco3(s)
To decompose 1.96 mol of NaHCO₃ (s), 199.2 kJ of heat is required.
Explanation:When baking soda (NaHCO₃) decomposes upon heating, it undergoes a chemical reaction, producing sodium carbonate (Na₂CO₃), water vapor (H₂O), and carbon dioxide gas (CO₂). The balanced equation for this reaction is:
NaHCO₃ (s) [tex]\rightarrow \text[/tex] {Na₂CO₃ (s) + H₂O (g) + CO₂ (g)
To determine the heat required to decompose a given amount of (NaHCO₃), we can use the stoichiometry of the reaction. The coefficient in front of (NaHCO₃) in the balanced equation is 2, indicating that 2 moles of (NaHCO₃) produce the products mentioned in the reaction.
Given that we have 1.96 mol of (NaHCO₃), we can set up a proportion to find the heat required:
[tex]\[\frac{\text{moles of } NaHCO₃}{\text{coefficient of } NaHCO₃} = \frac{\text{heat required}}{\text{coefficient of } Na₂CO₃}\][/tex]
[tex]\[ \frac{1.96}{2} = \frac{\text{heat required}}{1} \][/tex]
Solving for the heat required:
[tex]\[ \text{heat required} = 1.96 \times \frac{1}{2} \times \text{heat of the reaction} \][/tex]
The heat of the reaction can be obtained from thermochemical tables or databases. For the given reaction, it is typically around 199.2 kJ. Therefore, the heat required to decompose 1.96 mol of (NaHCO₃) is [tex]\(1.96 \times \frac{1}{2} \times 199.2 = 99.6\) kJ.[/tex]
In conclusion, 99.6 kJ of heat is needed to decompose 1.96 mol of (NaHCO₃) based on the provided chemical reaction.
Complete Question:
Baking soda (NaHCO₃) decomposes when it is heated according to the equation below:
[tex]\[2 \text{NaHCO}_3 (s) \rightarrow \text{Na}_2\text{CO}_3 (s) + \text{H}_2\text{O} (g) + \text{CO}_2 (g)\][/tex]
How many kilojoules of heat are required to decompose 1.96 mol of NaHCO₃ (s)?
Write the ions present in a solution of na3po4.
The ions present in the solution of [tex]\rm Na_3PO_4[/tex] will be [tex]\rm Na^+\,,\;PO_4^-\;,\;H_2PO_4^-\;,\;HPO_4^2^-[/tex].
The solution of [tex]\rm Na_3PO_4[/tex] will results in the dissociation of the molecule.
The dissociation will be:
[tex]\rm Na_3PO_4\;\rightarrow\;3\;Na_+\;+\;PO_4^-[/tex]
Thus the dissociation will result in the 3 sodium ions and 1 phosphate ion. The phosphate ion in the water solution will form phosphonium ions as well.
Thus the ions in the solution will be:
[tex]\rm Na^+\,,\;PO_4^-\;,\;H_2PO_4^-\;,\;HPO_4^2^-[/tex].
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Which element in period 4 has the highest electronegativity? potassium calcium copper bromine
Answer: Bromine has the highest electronegativity in period 4 of the periodic table.
Explanation:
Electronegativity is defined as the tendency of an atom to attract the shared pair of electrons towards itself whenever a bond is formed.
This property of an atom increases as we move from left to right in a period because the number of charge on the nucleus gets increased.
But this property decreases as we move from top to bottom in a group because electrons get add up in the new shells which make them further far away from the nucleus.
For the given options:
Potassium is present in Group 1, Period 4 of the periodic table.
Calcium is present in Group 2, Period 4 of the periodic table.
Copper is present in Group 11, Period 4 of the periodic table.
Bromine is present in Group 17, Period 4 of the periodic table.
Hence, bromine will have the highest electronegativity in Period 4.
If heat energy is absorbed by the system during a chemical reaction, the reaction is said to be
Devise a way to separate a mixture of sand, salt, and iron filings. Write the procedure using a step-by-step method and explain the reasoning behind each step. CAN SOMEONE PLEASE HELP ME??????!!!!!!!!!
Separate a mixture of sand, salt, and iron filings by first using a magnet to remove the iron filings. Then, add water to dissolve the salt, and decant the salty water, leaving the sand behind. Finally, allow the water to evaporate to retrieve the salt.
Explanation:To separate a mixture of sand, salt, and iron filings, you would first use a magnet to remove the iron filings from the mixture. This is possible because iron is a magnetic material and will be attracted to the magnet, which allows it to be separated from the non-magnetic substances (sand and salt).
Run a magnet over the mixture. Hold the magnet close but not directly in the substance, to attract only the iron filings.Next, to separate the sand and salt, add water to the mixture. Salt is soluble in water, which means it will dissolve in the water, but the sand will not.Stir the mixture to allow the salt to dissolve completely. Allow it to sit for a period to let the sand settle at the bottom.Then, decant (pour off) the salty water into another container, being careful to leave the sand behind.Finally, to retrieve the salt from the water, you can simply allow the water to evaporate, leaving the salt behind.Learn more about Separate mixture here:https://brainly.com/question/35865688
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When the following reaction is balanced the coefficient in front of carbon dioxide is: ____ C5H12 + ____ O2 → ____ CO2 + ____ H2O
The coefficient in front of CO2 in the reaction: C5H12 + 8O2 → 5CO2 + 6H2O is 5.
BALANCING A CHEMICAL EQUATION:
To balance a chemical reaction means to make sure that the number of atoms of each element on both sides of the equation is the same. To balance a chemical reaction, we make use of coefficients, which are numbers placed in front of the element. In the reaction given as follows: C5H12 + O2 → CO2 + H2O, the number of atoms of carbon, hydrogen, and oxygen are not equal on both sides of the equation. The balanced chemical equation is as follows: C5H12 + 8O2 → 5CO2 + 6H2O. This shows that the coefficient in front of carbon dioxide is 5.Learn more at: https://brainly.com/question/21049751?referrer=searchResults
Final answer:
The coefficient in front of carbon dioxide (CO2) when balancing the reaction C5H12 + O2 → CO2 + H2O is 5, as we need 5 CO2 molecules to match the 5 carbon atoms in C5H12.
Explanation:
To find the coefficient in front of carbon dioxide (CO2) when the given reaction C5H12 + O2 → CO2 + H2O is balanced, we first balance carbon (C) and hydrogen (H) atoms, since they appear in only one reactant and one product each. Then we adjust the oxygen (O) atoms. For the given reaction:
Balance carbon atoms: There are 5 carbon atoms in C5H12, so you need 5 carbon dioxide molecules to balance them. This gives us a coefficient of 5 for CO2.Balance hydrogen atoms: There are 12 hydrogen atoms in C5H12, so you need 6 water (H2O) molecules to balance them. This gives us a coefficient of 6 for H2O.Balance oxygen atoms: Now count the total oxygen atoms in the products: 5 CO2 molecules contribute 10 oxygen atoms, and 6 H2O molecules contribute another 6, for a total of 16 oxygen atoms. Since each O2 molecule has 2 oxygen atoms, we need 8 O2 molecules to get 16 oxygen atoms. This gives us a coefficient of 8 for O2.The balanced chemical equation is:
1 C5H12 + 8 O2 → 5 CO2 + 6 H2O
Checking the balanced equation: There are 5 carbon atoms, 12 hydrogen atoms, and 16 oxygen atoms on both sides of the equation, thus confirming the reaction is balanced.
The oxidation numbers of nitrogen in nh3, hno3, and no2 are, respectively:
Answer:
The oxidation number are
NH₃: -3
HNO₃ : +5
NO₂ : +4
Explanation:
The oxidation number is calculated considering that
a) oxidation number of hydrogen is +1 in all compounds except hydrides
b) oxidation number of oxygen is -2 in all compound except peroxides, superoxides and compound of fluorine.
a) NH₃ : let the oxidation number of nitrogen is "x"
x + 3 (+1) = 0
Therefore x = -3
b) HNO₃
Let the oxidation number of nitrogen is "x"
+1 + x +3(-2) = 0
x = -5.
c) NO₂
Let oxidation number of nitrogen ix "x"
x + 2(-2)= 0
x = +4
Rate is related to?
A. Volume
B. Time
C. Distance
D. Percentage
Ans: B) Time
Rate is a measure of change of a particular property over a certain time period. The property could be concentration, volume, mass etc.
Mathematically, if x denotes a certain property and t denotes the time then:
Rate = Δx/Δt = x2-x1/t2-t1
x1 and x2 are the initial and final values of the measured property measured at time t1 and t2 respectively.
Thus, rate is related to time.
In [cu(nh3)4]co3, how many 3d electrons does copper have?
Copper has a total of 29 electrons which would place the atom on the 29th number in the periodic table. In [Cu(NH₃)₄], there are 9 3d electrons of copper. The electron configuration of copper is [Ar] 4s² 3d¹⁰ but since there is a sub shell of its figuration that indicates only 1 electron filled, and since it is in the law that an electron must be paired up with another electron no matter how completely filled is the last sub shell, that is why the ast electron was given up to the other sub shell making it 9. The d shell can occupy around 10 electrons so it means that copper is a stable atom in the 3d sub shell. When you add [Cr(H₂O)₆]³⁺ (aq) and NH₃ (aq) a green solution because both are aqueous in form, you will get a purple solution containing [Cr(NH₃)₆]³⁺ (aq) and H₂O (l).
One tablespoon of peanut butter has a mass of 17.0 g. it is combusted in a calorimeter whose heat capacity is 110 kj/°c. the temperature of the calorimeter rises from 21.2 âc to 24.4 âc . what is the caloric content of peanut butter in cal/g?
The caloric content of peanut butter is approximately 1,347 cal/g.
Explanation:To find the caloric content of peanut butter in cal/g, we need to calculate the amount of heat transferred from the combustion of the peanut butter. We can use the formula:
q = mcΔT
Where q is the heat transferred, m is the mass of the peanut butter, c is the heat capacity of the calorimeter, and ΔT is the change in temperature.
Using the given values:
Mass of peanut butter (m)= 17.0 g Heat capacity of calorimeter (c) = 110 kJ/°C Change in temperature (ΔT) = 24.4 °C - 21.2 °C = 3.2 °C
Substituting these values into the formula:
q = (17.0 g)(110 kJ/°C)(3.2 °C)
q ≈ 5,632 J
To convert joules to calories, we divide by 4.184 (1 cal = 4.184 J):
5,632 J ÷ 4.184 cal/J ≈ 1,347 cal
Therefore, the caloric content of peanut butter is approximately 1,347 cal/g.
The diatomic molecule h2 has an extremely low boiling point because
If 3.50 g of the unknown compound contained 0.117 mol of c and 0.233 mol of h, how many moles of oxygen, o, were in the sample?
An ore contains fe3o4 and no other iron. the iron in a 36.6-gram sample of the ore is all converted by a series of chemical reactions to fe2o3. the mass of fe2o3 is measured to be 29 g. what was the mass of fe3o4 in the sample of ore?
To solve this problem, let us first find for the molar mass of Fe2O3 and Fe3O4.
Fe = 55.85 g/mol and O = 16 g/mol
Therefore,
Fe2O3 = 159.7 g/mol
Fe3O4 = 231.55 g/mol
We are given that there are 29 g of Fe2O3, we calculate for the amount of Fe from this in moles:
mol Fe = 29 g Fe2O3 (1 / 159.7 g/mol) (2 mol Fe / 1 mol Fe2O3)
mol Fe = 0.363 mol
Converting this to Fe3O4:
mass Fe3O4 = 0.363 mol Fe (1 mol Fe3O4 / 3 mol Fe) (231.55 g/mol)
mass Fe3O4 = 28.03 g
Therefore there are 28.03g of Fe3O4 in the ore.
Fungal laccase, a blue protein found in wood-rotting fungi, is 0.390% cu by mass. if a fungal laccase molecule contains four copper atoms, what is the molar mass of fungal laccase?
Answer:
65,179.487 g/mol is the molar mass of fungal laccase.
Explanation:
Percentage of copper in Fungal laccase = 0.390
Molar mass of fungal laccase = M
Number of copper atom in 1 fungal laccase molecule = 4
Atomic mass of copper = 63.55 g/mol
Percentage of an element in a compound:
[tex]\frac{\text{Number of atoms of element}\times \text{Atomic mass of element}}{\text{molecular mass of compound}}\times 100[/tex]
Percentage of copper:
[tex]\frac{4\times 63.55 g/mol}{M}\times 100=0.390\%[/tex]
[tex]M=\frac{4\times 63.55 g/mol}{0.390}\times 100[/tex]
M = 65,179.487 g/mol
65,179.487 g/mol is the molar mass of fungal laccase.
Titration experiments require the use of a...
Watch glass
Burette
Crucible
Bunsen burner
The rate (in mg carbon/m3/h) at which photosynthesis takes place for a species of phytoplankton is modeled by the function p = 120i i2 + i + 9 where i is the light intensity (measured in thousands of foot-candles). for what light intensity is p a maximum?
The given function is:
P = 120 i / (i^2 + i + 9)
or
P = 120 i (i^2 + i + 9)^-1
The maxima point is obtained by taking the 1st derivative of the function then equating dP / di = 0:
dP / di = 120 (i^2 + i + 9)^-1 + (-1) 120 i (i^2 + i + 9)^-2 (2i + 1)
setting dP / di =0 and multiplying whole equation by (i^2 + i + 9)^2:
0 = 120 (i^2 + i + 9) – 120i (2i + 1)
Dividing further by 120 will yield:
i^2 + i + 9 – 2i^2 – i = 0
-i^2 + 9 =0
i^2 = 9
i = 3 (ANSWER)
Therefore P is a maximum when i = 3
Checking:
P = 120 * 3 / (3^2 + 3 + 9)
P = 17.14
To find the light intensity at which photosynthesis rate for a given phytoplankton species is maximal, you must differentiate the function expressing photosynthesis rate in terms of light intensity, set the derivative equal to zero, and solve for i. This equation's solutions are the critical points where the rate of photosynthesis may reach a maximum.
Explanation:The question asks when photosynthesis rate (in mg carbon/m3/h) for a certain species of phytoplankton is maximal, given the function p = 120i / (i2 + i + 9) where i stands for light intensity (in 1000s of foot-candles).
To find the maximum value for any given function, you must find the derivative of that function (also referred to as the rate of change) and set it to equal zero. This can be performed using calculus, specifically the application of differentiation rules. Since the given function is a complex fraction, it's necessary to apply the Quotient Rule of differentiation, which states that the derivative of the quotient of two functions is the denominator times the derivative of the numerator minus the numerator times the derivative of the denominator all over the square of the denominator.
Once you have found the derivative, you find its roots by solving for i when the derivative equals zero. These i values provide the inflection points of the initial function which correspond to either the maximum or minimum values of p (these can be distinguished by checking a value to the left and right of each root), or where the function has a horizontal tangent.
In this way, the intensity of light at which photosynthesis rate for the phytoplankton is maximal can be derived.
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A compound analyzed as 18.0% carbon, 2.26% hydrogen, and 79.7% chlorine. calculate the empirical formula of the compound.
Final answer:
The empirical formula of a compound with 18.0% carbon, 2.26% hydrogen, and 79.7% chlorine can be calculated by converting the percentages to grams, assuming a 100 g sample, and then converting that to moles. The moles are then used to find the simplest whole number ratio, and after comparison and adjustment, we deduce an empirical formula of C₂H₃Cl₃.
Explanation:
To calculate the empirical formula of a compound with a given percent composition, we first convert the percentages to grams, assuming we have a 100 g sample. This means the compound contains 18.0 g of carbon (C), 2.26 g of hydrogen (H), and 79.7 g of chlorine (Cl). Next, we convert the mass of each element to moles by dividing by its atomic mass (C: approximately 12.01 g/mol, H: approximately 1.01 g/mol, Cl: approximately 35.45 g/mol).
Step-by-step:
Convert the mass of each element to moles:\nCarbon: 18.0 g ÷ 12.01 g/mol = 1.5 mol\nHydrogen: 2.26 g ÷ 1.01 g/mol = 2.24 mol\nChlorine: 79.7 g ÷ 35.45 g/mol = 2.25 molDetermine the simplest whole number ratio of the elements in moles. To do this, divide the number of moles of each element by the smallest number of moles from the three elements calculated:As hydrogen and chlorine are in almost a 1:1 molar ratio and carbon seems to be in a 2:3 ratio with chlorine, the empirical formula appears to be C₂H₃Cl₃. It's important to note that slight variations in these calculations could change the final empirical formula. Thus, we must adjust our calculations accordingly to ensure the molar ratios reflect whole numbers. If necessary, we multiply each of the mole ratios by the smallest common factor to obtain whole numbers.
Which statement highlights a unique role of water in a biological system
Determine the oxidation number of sulfur in NaHSO4.\
Vapor-pressure lowering is a colligative property of a solution, which means that it depends only upon _____.
Answer:
the number of solute particles
Explanation:
just aced the exam
What is the difference between h+ concentration in an acidic solution such as lemon juice (ph 2) and a basic solution such as household bleach (ph 13)?
The pH of solution is calculated using the formula:
pH = - log [H]
where [H] is the concentration of H+ ion in molarity
H+ concentration when pH = 2:
2 = - log [H]
[H] = 0.01 M
H+ concentration when pH = 13:
13 = - log [H]
[H] = 1 x 10^-13 M
The difference is therefore:
0.01 M - 1 x 10^-13 M = 0.01 M
The concentration at pH=13 is so small that it can be considered negligible.
Answer:
The pH of solution is calculated using the formula:
pH = - log [H]
where [H] is the concentration of H+ ion in molarity
H+ concentration when pH = 2:
2 = - log [H]
[H] = 0.01 M
H+ concentration when pH = 13:
13 = - log [H]
[H] = 1 x 10^-13 M
The difference is therefore:
0.01 M - 1 x 10^-13 M = 0.01 M
The concentration at pH=13 is so small that it can be considered negligible.
Explanation:
How is a mixture different from a compound? 1. composition of a mixture may be constant. 2. components of a mixture can be separated by physical means. 3. components of a mixture can only be separated chemically. 4. particles of a mixture are combined chemically?
Mixture is different from a compound because components of a mixture can be separated by physical means.
What is a compound?
Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.
Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.They are:
1)Molecular compounds where in atoms are joined by covalent bonds.
2) ionic compounds where atoms are joined by ionic bond.
3)Inter-metallic compounds where atoms are held by metallic bonds
4) co-ordination complexes where atoms are held by co-ordinate bonds.
They have a unique chemical structure held together by chemical bonds Compounds have different properties as those of elements because when a compound is formed the properties of the substance are totally altered.
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Nickel and gold combine to make white gold. White gold is considered a(n) of nickel and gold.
The fundamental mendelian process that involves the separation of contrasting genetic elements at the same locus would be called _______
Based on its location on the periodic table, which element would be most likely to form a negative ion?
A. Aluminum (Al)
B. Copper (Cu)
C. Sodium (Na)
D. Fluorine (F)
Answer: The element which is most likely to form negative ion is fluorine.
Explanation:
An ion is formed when a neutral atom looses or gains electrons.
When an atom looses electrons, it results in the formation of positive ion known as cation.When an atom gains electrons, it results in the formation of negative ion known as anion.For the given options:
Option A: AluminiumAluminium is the 13th element of the periodic table having electronic configuration of [tex]1s^22s^22p^63s^23p^1[/tex]
This element will loose 3 electrons to attain stable electronic configuration and will form [tex]Al^{3+}[/tex] ion
Option B: CopperCopper is the 29th element of the periodic table having electronic configuration of [tex]1s^22s^22p^63s^23p^64s^23d^9[/tex]
This element will loose 2 electrons to attain stable electronic configuration and will form [tex]Cu^{2+}[/tex] ion
Option C: SodiumSodium is the 11th element of the periodic table having electronic configuration of [tex]1s^22s^22p^63s^1[/tex]
This element will loose 1 electron to attain stable electronic configuration and will form [tex]Na^{+}[/tex] ion
Option D: FluorineFluorine is the 9th element of the periodic table having electronic configuration of [tex]1s^22s^22p^5[/tex]
This element will gain 1 electron to attain stable electronic configuration and will form [tex]F^{-}[/tex] ion
Hence, the element which is most likely to form negative ion is fluorine.
Is smelting a chemical or physical process?
How many protons are there in 20.02 mol of neon (ne)?
Answer: There are 1.216×10^26 protons in 20.02mole of neon
Explanation:
Using Avogadro's number
1 mole of neon contains 6.023×10^23 neon atoms.
I atm contains 10 protons
Number of protons = (6.023×10^23)×20.02×10= 1.216×10^26
A sample of gas has a pressure of 3.00 atm at 25 degrees Celsius. What would the pressure be at 52 degrees Celsius if the volume stays constant? Which gas law does this problem represent?
A 13.00 g sample of a compound contains 4.15 g potassium (k), 3.76 g chlorine (cl), and oxygen (o). calculate the empirical formula.
To solve this problem, let us all convert the mass of each element into number of moles using the formula:
moles = mass / molar mass
Where,
molar mass K = 39.10 g / mol
molar mass Cl = 35.45 g / mol
molar mass O = 16 g / mol
and mass O = 13 g – 4.15 g – 3.76 g = 5.09 g
moles K = 4.15 g / (39.10 g / mol) = 0.106 mol
moles Cl = 3.76 g / (35.45 g / mol) = 0.106 mol
moles O = 5.09 g / (16 g / mol) = 0.318 mol
The ratio becomes:
0.106 K: 0.106 Cl: 0.318 O
We divide all numbers with the smallest number, in this case 0.106. This becomes:
K: Cl: 3O
Therefore the empirical formula is:
[tex] KClO_{3} [/tex]