Hydrogen peroxide decomposes to water and oxygen at constant pressure by the following reaction:
2 H2O2(l) → 2 H2O(l) + O2(g) ΔH = -196 kJ
Calculate the value of q (kJ) in this exothermic reaction when 5.00 g of hydrogen peroxide decomposes at constant pressure.
The value of q (kJ) in the exothermic reaction when 5.00 g of hydrogen peroxide decomposes at constant pressure is 14.40kJ.
What is an exothermic reaction?
Exothermic reaction is the reaction in which the standard enthalpy change of the reaction is negative that is there is release of heat energy.
The q (kJ) in the exothermic reaction can be calculated as,
2 H2O2(l) ------> 2 H2O(l) + O2(g) ΔH = -196 kJ
So, 196kJ of heat (q) will be released for every 2 moles of hydrogen peroxide. To calculate the heat released for 5.00 g of hydrogen peroxide,
Number of moles of hydrogen peroxide = 5.00g / 34.016 g/mol
n = 0.147
q = -196 x 0.147 / 2 = 14.40kJ.
Therefore, 14.40kJ of heat is released by 5.00 g of hydroxide peroxide when it decomposes in the exothermic reaction.
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Hypochlorous acid is a weak acid. Write an equation showing how HCIO acts in solution; then
write the K, expression for HCIO.
Hypochlorous acid is a weak acid. Its equation is following:-
HClO ⇄ H⁺ + ClO⁻
K = [H⁺] [ClO⁻] / [HClO]
Weak Acids are the acids that do not completely dissociate into their constituent ions when dissolved in solutions.
When dissolved in water, an equilibrium is established between the concentration of the weak acid and its constituent ions.
The awareness of a substance is the quantity of solute present in a given amount of answer. Concentrations are typically expressed in phrases of molarity, defined as the wide variety of moles of solute in 1 L of answer.
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Since benzoin and meso-hydrobenzoin have similar melting points, how would you confirm that the product you obtained from this reaction is indeed meso-hydrobenzoin using only melting point techniques? describe briefly how you would carry out this experiment.
The products benzoin and meso-hydro benzoin melting points are same. Their temperature is 13341 degrees Celsius. Using the melting point method makes it challenging to directly determine. It would be necessary to determine the reaction's end product and then measure the melting point.
What does the melting point experiment aim to achieve?The thermal analysis that is most usually used to describe solid crystalline materials is melting point determination. It is used to identify solid crystalline chemicals and to assess their purity in research and development as well as in quality control in different industry areas.
The melting values of the products were between benzoin and meso-hydro benzoin 135 and 137, indicating that the molecule is likely benzoin because they are so similar to benzoin's melting points (135 to 137). Compared to hydroxybenzoic acid, benzoin has a melting point range that is closer to the finished product.
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Why does a uranium glass glows under UV light ?
Answer:
The uranium fluoresces under UV light
Explanation:
The uranium fluoresces under UV light because the UV excites the electrons above the ground state and gives off photons as the electrons transition back to the ground state,” Naomi Marks, a research scientist at the Lawrence Livermore National Laboratory in California, tells Collectors Weekly.
Answer:
Uranium oxide.
Explanation:
Uranium glass does indeed glow under a blacklight. This is because of the uranium oxide that is used to produce the glass. When exposed to ultraviolet light, the uranium oxide will emit a greenish-yellow light.
Rb element oxidation numbers
Answer:
+1.
Explanation:
Population and Water This activity will help you meet this educational goal: Content Standards—You will explain why scarcity and choice are basic economic problems faced by every society. Directions Read the instructions for this self-checked activity. Type in your response to each question, and check your answers. At the end of the activity, write a brief evaluation of your work. Activity Think about the video you watched earlier and answer these questions. Part A What was the scarce resource in the video?
Population and water are as the population increases the percentage of people without access to clean water will increase as well
Overpopulation will strain current water resources to their limits and cause an increase in water pollution and lead to an increase in civil and international conflict over existing water supplies and as the population increases the percentage of people without access to clean water will increase as well and in many urban areas water scarcity is already a reality and this leave many cities sorely unequipped for continued rapid population growth in the future
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Which unit cell is a simple cubic unit cell?
Answer:
his unit cell only contains one atom. Its packing efficiency is about 52%. To packing efficiency, we multiply eight corners by one-eighth (for only one-eighth of the atom is part of each unit cell), giving us one atom. An example of a Simple Cubic unit cell is Polonium.
Explanation:
A description of a unit cell in which a simple cubic unit cell is found in polonium.
How polonium is a simple cubic unit cellA simple cubic unit cell simply refers to that substance which consist of 8 different atoms in a cubic unit. When we look carefully into polonium, it usually, frequently and most of the time crystalizes in cubic unit. It is on this premise that we say that polonium is identified as a simple cubic unit cell?
So therefore, we can now confirm and also deduce from the explanation above that we a simple cubic unit cell has in itself eight corners of atoms.
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What is the molar mass of a compound if 0.0401 moles weigh 21.6 grams ?
The molar mass of a compound of 0.0401 moles weighing 21.6 grams is 538.65 g.
The molar mass of a substance is the mass in grams of one mole of the compound. In a substance, the amount of entities present e.g. atoms, molecules, ions, is defined as a mole.
∴M = m / n
M = molar mass
m = mass of a substance (in grams) = 21.6 grams
n = number of moles of a substance = 0.0401 moles
∴ 0.0401 moles of a compound have a mass of 21.6 g
∴ 1 mole of the compound will have a mass of 21.6 / 0.0401
= 538.65 g (molar mass of compound)
So, the molar mass of a compound of 0.0401 moles weighing 21.6 grams
is 538.65 g.
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During aerobic respiration, h2o is formed. Where does the oxygen atom for the formation of the water come from?.
The oxygen atom for the formation of the water comes from molecular oxygen.
The non-metallic chemical element oxygen is found in Group 16 of the periodic table, generally known as the oxygen group (O). All living creatures require the colorless, tasteless, and odorless gas known as oxygen. When plants use it as a source of carbon and release the oxygen back into the environment, plants utilise the carbon dioxide that animals have taken up and converted it into.
Oxygen may react with almost every other element to form compounds in addition to reactions that remove elements from their combinations with one another. Combustions are the name for these reactions, which are typically accompanied by the creation of heat and light. The most important component is water.
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what is the IUPAC name of the following substance?
The IUPAC name of the following substance is 3-methylpent-2-ene.
What is IUPAC NAME?Th IUPAC nomenclature of an organic chemistry is defined as a method of naming of the organic chemical compounds which is recommended by the International Union of Pure and Applied Chemistry. It was published in the Nomenclature of Organic Chemistry.
Rules:Firstly, we check the chain having large number of carbon atoms. Since, the substance having longest chain contain five chain. Prefix is named by seeing the functional group. Since, methyl group is attached to the third carbon atom. Therefore, 3-methyl is suffix. This compound contains double bond. Therefore, ene is used as suffixThus, we concluded that the IUPAC name of the following substance is 3-methylpent-2-ene.
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How can we determine the rate of the decomposition of H2O2?
Answer:
Because the concentration of oxygen is proportional to its pressure, we can calculate the rate at which H2O2 decomposes by monitoring the rate of increase of the pressure due to the formation of oxygen. By varying the initial molar concentration of H2O2 solution, the rate law for the reaction can be determined.
Explanation:
The reaction rate depends on the disappearance of the hydrogen peroxide or on the appearance of oxygen
What is the rate of decomposition?We know that the rate of decomposition has to the rate at which the compound hydrogen peroxide can be broken down so as to obtain water and oxygen.
In this case, we can see that there are two ways that we can be able to monitor the rate of the reaction and these two ways are;
1) To observe the rate at which the hydrogen peroxide disappears
2) To observe the rate at which the oxygen gas appears.
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Consider the reaction below.
HCl (aq) + NaOH (aq) --> H2O (l) + NaCl (aq) Δ = -55.8 kJ
Calculate the final temperature (in oC) when 25.0 mL of 5.42 M HCl are mixed with 25.0 mL of 4.32 M NaOH, if each solution starts at 25.0 oC.
Ignore the heat absorbed by the calorimeter, and assume the solution has the same specific heat capacity and density as pure water.
The final temperature (in °C) when 25.0 mL of 5.42 M HCl are mixed with 25.0 mL of 4.32 M NaOH, if each solution starts at 25.0 °C is 28 °C.
The reaction is given as :
HCl + NaOH -----> H₂O + NaCl
moles of HCl = 5.42 × 0.025
= 0.135 mol
moles of NaOH = 4.32 × 0.025
= 0.108 mol
moles of reaction = 0.108 mol
specific heat capacity is given as:
Q = mc ΔT
Q = 0.108 × (- 55.8) = - 6.026 kJ = 602.6 J
total volume = 25 ml + 25 ml = 50 ml
mass = density × volume
= 1.04 × 50 = 52 g
now, Q = mc ΔT
602.6 = 52 × 3.93 × ( T - 25)
The final temperature T = 28 °C
Thus, The final temperature (in °C) when 25.0 mL of 5.42 M HCl are mixed with 25.0 mL of 4.32 M NaOH, if each solution starts at 25.0 °C is 28 °C.
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1.) A Compound has 38.7% carbon 9.6% hydrogen 51.6% oxygen
What is its empirical formula ?
The molar mass of the compound is 62g/mol what is its molecular formula?
2.) a compound has 94.1% oxygen and 5.9% hydrogen
what is its empirical formula ?
its molar mass is 34 g/mol
Empirical formula is the simplest whole number ration of elements in a compound. Molecular formula is n times the empirical formula, where n is integers 1,2,... The empirical formula is CH[tex]_2[/tex]O.
What is Empirical formula?
Empirical formula gives the proportion of the element that is present in a compound. It does not give information about the actual number or the arrangements of the atoms.
Number of gram atoms in compound and divide by smallest Number of gram atoms in compound
C=(38.7%)÷12=3.2
H=(9.6%)÷1=9.6
O=( 51.6%)÷16=3.2
The atomic ratio is 3.2:9.6:3.2
Whole number C:H:O is1:2:1
Empirical formula corresponding to this whole number is CH[tex]_2[/tex]O.
Thus the empirical formula is CH[tex]_2[/tex]O.
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identify the reaction types
1. 2H₂O₂ -> 2H₂O + O₂
2. 2CO + O₂ -> 2CO₂
3. 2KBr + Cl₂-> 2KCI + Br₂
4. 2H₂O₂ -> 2H₂O + O₂
5. 2HgO -> 2Hg + O₂
6. CaO + H₂O -> Ca(OH)₂
7. Zn + H₂SO4 -> ZnSO4 + H2
8. 2H2 + O2 -> 2H2O
9. Ca(OH)2 + H2SO4 -> CaSO4 + 2H2O
10. AgNO3 + NaCl -> AgCl + NaNO3
The reaction types are oxidation-reduction, displacement, and double displacement reaction.
1. 2H₂O₂ -> 2H₂O + O₂ ----------- reduction.
2. 2CO + O₂ -> 2CO₂ ------------ Synthesis
3. 2KBr + Cl₂-> 2KCI + Br₂ ----- Single Replacement
4. 2H₂O₂ -> 2H₂O + O₂ ---------------- reduction.
5. 2HgO -> 2Hg + O₂ ----------- Decomposition.
6. CaO + H₂O -> Ca(OH)₂ ---------- synthesis / hydration
7. Zn + H₂SO4 -> ZnSO4 + H2 ----- single displacement
8. 2H2 + O2 -> 2H2O ---------- Synthesis.
9. Ca(OH)2 + H2SO4 -> CaSO4 + 2H2O --- double displacement.
10. AgNO3 + NaCl -> AgCl + NaNO3 --- double displacement.
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3. Write the names for each of the following structures.
The IUPAC names of the given organic compounds are as follows:
methanolpropan-2-ol or 2-propanolbutan-2-ol or 2-butanolhexanolheptanolWhat are the IUPAC names of the given organic compounds?The IUPAC names of the given organic compounds are derived from three parts to their name:
the root hydrocarbon - this is the longest continuous straight carbon-to-carbon chain whose name is derived from the parent alkanethe suffix - which is the main substituent ground serving as the functional group in the compoundthe prefix - other substituents in the compound that are not the functional group.The given compounds have a principal functional group of -OH which is the alkanol functional group.
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Balance the chemical equation: Fe + Cl₂ → FeCla.
Answer:
2Fe + Cl₂ → 2FeCl
Explanation:
Answer:
2Fe + Cl(sub2) ---> 2FeCl
Explanation:
Before balancing, there is 1 Fe and 2 Cl on the left side of the equation. In order to get 2 Cl on the right side, we have to multiply (FeCl) by 2. This causes there to be 2 Fe on the right side also, so now you go back and multiply 2 by the Fe on the left. Leaving you with 2 Fe and 2 Cl on the left, and 2 Fe and 2 Cl on the right.
list three ways in which the properties of metallic solids and ionic solids are different.
How many hydrogen atoms are in 25.5g of c2h2?
The hydrogen atoms are in 25.5g of C₂H₂ is 11.79 gm. The chemical substance known as acetylene has the formula C₂H₂ . One acetylene molecule contains two hydrogen atoms. The alkyne series' first stable component is acetylene.
What is acetylene ?The chemical compound acetylene has the formula C2H2 and the chemical formula HC ≡ CH. It is the most basic alkyne and a hydrocarbon. This colorless gas is frequently utilized as a fuel and a component of chemical compounds. Since it is unstable in its pure state, a solution is typically used.
Compressed acetylene and compressed oxygen are frequently utilized to power torches used for a variety of operations. Due to its strong flammability, instability, and particular storage and transportation needs, acetylene poses special risks. Acetylene is extremely brittle.
Thus, The hydrogen atoms are in 25.5g of C₂H₂ is 11.79 gm.
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In a _____, one line represents one pair of electrons being shared.
In a covalent bond, one line represents one pair of electrons being shared.
What are covalent compounds?Covalent compounds are compounds formed as a result of sharing of electrons between the atoms that make up the compound.
In other words, electrons are shared among atoms that make up covalent compounds unlike in ionic compounds where some atoms donate electrons while some atoms accept electrons.
Thus, a line in the structure of covalent compounds represents a bond formed as a result of sharing a pair of electrons between two atoms.
For example, the line between C and H in C-H represents a bond formed between the two atoms as a result of sharing a pair of electrons between them. Whereas, the line between Na and Cl atoms in Na-Cl represents a bond formed as a result of Na donating an electron to Cl.
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A transcriptional repressor, which is at a concentration in the bacterial cell of 10 nM, binds to
its target DNA sequence with a KD of 0.1 nM in the absence of its ligand, and with a KD of 1 μM in
the presence of its ligand. It also binds to non-target DNA sequences with a KD of 10 μM
regardless of the presence or absence of its ligand. The transcriptional repressor’s target DNA
sequence occurs once in the genome and there are 20,000 non-target DNA sites in the genome.
What is the specificity of the transcriptional repressor for its target site over non-target sites in
the absence of its ligand?
What is the specificity of the transcriptional repressor for its target site over non-target sites in
the presence of its ligand?
The specificity of the transcriptional repressor for its target site over non-target sites in the absence of its ligand is very low. The specificity in the presence of the ligand is very high.
What is transcriptional repressor?Transcriptional repressor is defined as a sequence-specific DNA binding proteins work by enticing corepressor complexes, which are made up of a variety of proteins, including histone modifying enzymes. It binds the DNA and repel RNA polymerase.
In the absence of its ligand, the specificity of the transcriptional repressor for its target site over non-target sites is relatively low. In the presence of the ligand, the specificity is quite high because ligand is used as a binding agent and if binding agent is not present the molecule does not bind easily.
Thus, the specificity of the transcriptional repressor for its target site over non-target sites in the absence of its ligand is very low. The specificity in the presence of the ligand is very high.
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The complete photoelectron spectrum for an element is shown above. Which of the following observations would provide evidence that the spectrum is consistent with the atomic model of the element?
answer choices
A neutral atom of the element contains exactly two electrons.
The element does not react with other elements to form compounds.
In its compounds, the element tends to form ions with a charge of +1.
In its compounds, the element tends to form ions with a charge of +3.
Evidence that the spectrum is consistent with the atomic model is that the neutral atom of an element contains exactly two electrons.
What is an element?It is defined as a substance which cannot be broken down further into any other substance. Each element is made up of its own type of atom. Due to this reason all elements are different from one another.
Elements can be classified as metals and non-metals. Metals are shiny and conduct electricity and are all solids at room temperature except mercury. Non-metals do not conduct electricity and are mostly gases at room temperature except carbon and sulfur.
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What is physical weathering?
the transformation of rocks into some other type of materials
the breaking of rock into smaller pieces from nonchemical processes
the building up of rock that has been brought from other places
the movement of rock from one place to another
Answer:
B
Explanation:
I took the test
Answer:
the breaking of rock into smaller pieces from nonchemical processes
Explanation:
Basically, the process that breaks rocks apart without changing their chemical composition.
PLEASE HELP!! WILL GIVE BRAINLIEST!!
A certain reaction is endothermic in the forward direction and has a greater number of molecules on the product side. Which set of conditions should be used to maximize the yield of the products? (5 points)
Group of answer choices
Decrease the temperature and decrease the pressure.
Increase the temperature and decrease the pressure.
Decrease the temperature and increase the pressure.
Increase the temperature and increase the pressure.
Answer:Decrease the temperature and increase the pressure
Is it possible to get a homozygous dominant offspring with brown eyes if you
cross and Heterozygous Dad with brown eyes, and a Homozygous recessive
with blue eyed Mom?
Use the empty Punnett square to determine if this is possible. Explain your
answer and copy and paste your completed Punnett square into the
discussion along with your answer.
Yes, because green eye alleles are more common than blue eye alleles; therefore, a parent with blue eyes can only have two blue eye alleles.
What is a brief definition of alleles?The term "allele" is used to refer to a gene's alternate form or variants. For each autosomal gene, one allele is inherited from each parent, and we often group the alleles into categories. Usually, we refer to them as normal, wild-type, aberrant, or mutant alleles.
An allele or a gene?A gene's changeable form is called an allele. There are some genes that come in different forms yet all have the same genomic location on a chromosome. Humans are considered diploid organisms because each genetic locus in them has two alleles, one from each parent..
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How does the weight of an object affect the amount of force it would need to move
............................................................................................................................
Answer:
............................................................................................................................
Explanation:
because ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
Help me please!!
Means a lot
How to identify covalent and ionic compounds?
Ionic compounds are (usually) formed when a metal reacts with nonmetal (or a polyatomic ion). Covalent compounds are formed when two nonmetals react with each other11 dinitrogen trioxide - N2O3 - covalent , both oxygen and nitrogen are nonmetals.
13 barium phosphate - Ba₃ (PO4)₂ - ionic , bond is created by giving or taking electrons.
14 lithium acetate - Li⁺ CH3COO⁻ - ionic
15 phosphorus trifluoride - PF₃ - covalent, formed by the sharing of electrons between phosphorus and fluorine atoms.
16 vanadium (V) oxide - V2O5 - ionic
17 aluminum hydroxide - Al(OH)3 - covalent, according to fajan rule
18 zinc sulfide - ZnS - ionic , its composed of Zn²⁺ and S²⁻ ions
19 silicon tetrafluoride - SiF4 - covalent, their bonds are arranged in tetrahedral shape
20 nickel(11) phosphate - Ni₃(PO4)₂ - ionic, as nickel is metal and phosphate is polyatomic ion
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Please SHOW WORK/steps for all problems, answers already there
1. The solution of the problem is volume = 9.14 mL.
Use this formula, P1V1/T1 = P2V2/T2
Here,
P1 = initial pressure, given = 746 mm Hg
V1 = initial volume, given = 10.1 mL
T1 = initial temperature, given = 23° C = 296 K
P2 = final pressure, given = 760 mm Hg
V2 = final volume
T2 = final temperature, given = 0° C = 273 K
Put these values in formula, P1V1/T1 = P2V2/T2
V2 = P1V1T2/P2T1
V2 = 9.14 mL
Hence,
2. The solution of the problem, put the values in formula,
P1V1/T1 = P2V2/T2
V2 = P1V1T2/P2T1
3.The solution of the problem, put the values in formula,
P1V1/T1 = P2V2/T2
V2 = P1V1T2/P2T1
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How many oxygen atoms does the compound 2ca3(PO4)2 have?
Answer:2
Explanation:
Use your understanding of the ideal gas law to
identify the correct relationships among the
variables.
Pressure is
Temperature is
Volume is
Moles are
The ideal gas relationships among the variables are PV = nRT
An ideal gas is a theoretical gas composed of many randomly transferring factor particles that aren't difficult to interparticle interactions. the best gasoline idea is beneficial because it obeys the precise gas law, a simplified equation of country, and is amenable to evaluation under statistical mechanics.
Volume is a degree of occupied three-dimensional space. it's far more frequently quantified numerically the usage of SI-derived gadgets or by way of diverse imperial gadgets. The definition of length is interrelated with the extent.
An ideal gas is described as one for which both the extent of molecules and forces between the molecules are so small that they have got no effect on the behavior of the gas. The real gas that acts almost like a really perfect gasoline is helium. that is due to the fact helium, in contrast to maximum gases, exists as an unmarried atom, which makes the van der Waals dispersion forces as low as viable
relation
PV = nRT
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