The final molarity of the ammonium cation in the solution is 0.066M.
Firstly, we need to calculate the number of moles of ammonium sulfate:
No of moles = mass(g)/molar mass
No of moles = 2.57/132.14
No of moles = 0.0195 mol
When ammonium sulfate dissolves in sodium chromate, the following reaction will take place:
(NH₄)₂SO₄ + Na₂CrO₄ ------> (NH₄)₂CrO₄ + Na₂SO₄
No of Moles of sodium chromate = molarity x volume
= 66 x 0.200
No of moles of Sodium Chromate = 0.0132 mol
According to the reaction, 1 mol of sodium chromate produces 1 mol of ammonium chromate.
In this reaction, the sodium chromate amount is less than ammonium sulfate.
It can be concluded that Sodium chromate is a limiting reagent.
Therefore 0.0134 mol of ammonium cation is present in the resulting solution.
Molarity of ammonium cation = 0.0134 mol / 0.2 L
Molarity = 0.066 M
Therefore, 0.066M is the Molarity of the ammonium cation.
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zones in lakes and oceans are delineated by depth, distance from shore, or light penetration. different zones have different physical and chemical characteristics, such as temperature and salinity. label the diagrams of zonation in lakes and oceans. drag the labels to their correct targets on the diagrams below.
The diagrams of zonation in lakes and oceans with correct targets are :
a) fresh plant may be rooted here
b) littoral zone
c) limnetic zone
d) alternately dry and submerged
e) extends to edge of the continental shelf
f) generally low nutrient levels
g) light penetrates here
h) no photosynthesis occurs here
i) benthic zone
There are zones which divided the lakes. they are separated by the water from the top to bottom and the side to the side. that is named as : the littoral zone , the limnetic zone, the profundal zone , the benthic zone and the euphotic zone . the waters temperature will be affected the density. there are several zones in the ponds and the lakes. these are dived by the water column.
The limnology divides the lakes in the three types of zones ., that is the limnetic zone, the littoral zone and the benthic zone.
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The table compares some characteristics of two atoms.
Charged Particles
Atom Number of Neutrons Mass Number
X 4 7
Y 5 9
Use the table to determine the number of protons for each atom. Then, choose the statement below that is true about the two atoms.
Atoms X and Atom Y are in the same family.
Atom X is in a column to the right of Atom Y on the periodic table.
Atom X and Atom Y are in the same row on the periodic table.
Atoms X and Atom Y are isotopes.
The statement that is true about the elements;
Atom X and Atom Y are in the same row on the periodic table. Option C
What is the periodic table?We know that the periodic table has to do with an arrangement of the elements in an order that is systematic. As such, when we look at the periodic table, we are looking at a systematization of the elements in a way that it is quite easy for us to be able to identify the elements.
Now we know that the mass number is the sum of the atomic number which in turn is the proton number and the number of the neutrons in the atom.
We know that the atomic number is what would tell us the group to which the element has been found to belong and in this case we can see that element X is just right to element Y in the periodic table.
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a chemistry graduate student is given of a chloroacetic acid solution. chloroacetic acid is a weak acid with . what mass of should the student dissolve in the solution to turn it into a buffer with ph ? you may assume that the volume of the solution doesn't change when the is dissolved in it. be sure your answer has a unit symbol, and round it to significant digits.
Choloracetic acid, 12 g. The colorless solution of the white crystalline substance known as chloroacetic acid.
Up to 80% of the solution can be acidic. By inhalation, ingestion, and skin contact, it is poisonous. It corrodes flesh and metals.
The equilibrium of the buffer is
CH2ClCO2 + H+ HCH2ClCO2
PKA = Log Ka
Ka: [CH2ClCO2] = 1,3 x 103. "H+" / "HCH2ClCO2"
Using the Henderson-Hasselbalch formula:
pH equals pka plus log10 [A]/[HA].
2,89 + log10 [A] / [HA] = 3,01
1,318 = [A⁻] / [HA]
Since chloroacetic acid (HA) has a molar concentration of 0,20M
[A⁻] = 0,26 mol/L
There are 500 mL plus 0.5 L.
Chloroacetic acid is equal to 0,26 mol/L x 0,5 l, or 0,13 moles. By weight:
Choloracetic acid is equal to 0,13 mol (94,5g / 1mol) = 12 g.
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Find the volume, in mL, of an object whose density is 400 g/mL and has a mass of 600
mg.
The volume of the object is 1.5ml.
What is the volume of an object?This refers to the space occupied within the boundaries of an object in three-dimensional space. It is also called the capacity of the object.
In the question:
ρ = 400 g/mL
m = 600 mg
v = ?
Formular for calculating density ρ:
ρ = m/v
Where,
ρ= Density of the object
m= Mass of the object
v = volume of the object
Were are given the values of density and mass in the question. We are to calculate the volume.
Makinig v subject of the formular we have:
v = m/ρ
v = 600 mg
400 g/mL
v = 1.5ml
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study this chemical reaction: ca(s) zncl2(aq)zn(s)cacl2(aq) then, write balanced half-reactions describing the oxidation and reduction that happen in this reaction
This chemical reaction: ca(s) zncl2(aq)zn(s)cacl2(aq) then, balanced half-reactions describing the oxidation and reduction that happen in this reaction is Ca (s) + ZnCl2 (aq) ---> Zn (s) + CaCl2 (aq).
When the substrate's oxidation states change, a chemical reaction known as redox (reduction-oxidation) takes place. Reduction occurs when electrons are obtained or the oxidation state drops; oxidation occurs when electrons are lost or the oxidation state increases. There are two types of redox reactions: During an electron transfer, only one electron (usually) travels from the reducing agent to the oxidant. This type of redox reaction is frequently discussed in terms of redox couples and electrode potentials. When one substrate gives way to another, an atom transfers. When iron rusts, for example, oxygen's oxidation state decreases as it receives electrons released by the iron, while the oxidation state of the iron atoms increases as the iron transforms into an oxide. Despite the fact that oxidation processes are typically related to the generation of oxides, other chemical species can carry out the same function. To weaken C=C (and other) bonds, hydrogen atoms are exchanged during hydrogenation.
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A fresh sample 1311 was left out on the benchtop for 40 days. The scientist forgot it has a half-life of 8 days. The original sample mass
was 64 g. How much of the parent isotope is left?
g
Answer:
2 g of the parent isotope is left.
Explanation:
The half-life of a radioactive isotope is the amount of time it takes for half of the isotope to decay. In this case, the half-life of the isotope is 8 days, which means that after 8 days, half of the isotope will have decayed.
To determine how much of the parent isotope is left after 40 days, we need to calculate how many half-lives have passed in that time. Since the half-life is 8 days, and 40 days have passed, we can divide 40 by 8 to find the number of half-lives that have occurred: 40 / 8 = 5
Since 5 half-lives have passed, we can calculate the amount of the parent isotope that is left by multiplying the original amount of the isotope by 1/2 to the power of the number of half-lives that have passed: 64 * (1/2)^5 = 64 * (1/32) = 2 g
Therefore, after 40 days, only 2 g of the parent isotope is left.
2Na3N + 3Ca(OH)2 →Ca3N2 + 6NaOH
If you have 448.2 g of calcium hydroxide how many grams of sodium hydroxide can be
formed?
Answer:
3Ca(OH)2 = 3(40+2(16+1))
= 222
448.2 ÷ 222 = 2.02mol
6NaOH = 6(23+16+1)
= 240
240 × 2.02mol = 484.5 g
Identify the options below that are results of decreasing the temperature of a system that includes an exothermic reaction in the forward direction. A. The concentration of the reactants increases. B. The concentration of the products increases. C. The equilibrium constant decreases. D. The equilibrium shifts toward the products.
If the reaction is exothermic as described, a rise in temperature will thus trigger the opposite reaction, which will result in a decrease in the amount of the products and an increase in the number of reactants. The reverse outcome will occur if the temperature is lowered.
B. The concentration of the products increases.
A reaction is defined as exothermic if the overall standard enthalpy change (H) is negative. Exothermic processes typically produce heat. Exergonic reaction, which the IUPAC defines as "... a reaction for which the overall standard Gibbs energy change G is negative," is frequently mistaken with the phrase.
Because "H" contributes significantly to "G," a strongly exothermic process is typically also exergonic. Exothermic and exergonic chemical reactions make up the majority of the impressive demonstrations in schools.
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Based on your answers to your group report: Rank the relative viscosity and vapor pressure of the substances: methane (CH4), pentane, and polyethylene polyethylene lowest viscosity and higes Choose ] lowest viscosity and higest vapor pressure highest viscosity and highest vapor pressure lowest viscosity and lowest vapor pressure. highest viscosity and lowest vapor pressure intermediate viscosity and intermediate vapor pressure I Choose ]methane pentane
Rank the relative viscosity and vapor pressure of the substances Paraffin, hexadecane, octane, 2,2,4-trimethylpentane,methane.
In addition to being a fuel or fuel component for diesel and tractor engines, paraffin is frequently utilized as a fuel for jet engines and rockets. These are some typical applications for paraffin: Paraffin wax, a white or colorless soft solid that is used as a lubricant, in candles, crayons, electrical insulation, and petroleum jelly, is a complex mixture of hydrocarbons that is especially obtained from distillates of wood, coal, petroleum, or shale oil. It is primarily used in coating and sealing, candles, rubber compounding, pharmaceuticals, and cosmetics. Consuming excessive amounts of paraffin might result in intestinal blockage, which can bring on symptoms including nausea, vomiting, and constipation. An individual with a dye allergy could get tongue swelling if the paraffin contains that dye.
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Identify each statement as True or False. a) The value of K_w applies to any aqueous solution, not just pure water b) Ions that appear on both sides of an equation but undergo no change in a reaction are called spectator ions. c) An aqueous solution containing an equal number of moles of NaF and HF in an aqueous solution is an example of a buffer solution. d) A solution containing a low concentration HCl is a weak acid.
Identify each statement as True or False a) True b) True c) True d) False Not just pure water, but all aqueous solutions are subject to the equilibrium constant Kw.
In pure water, the concentrations of the hydronium and hydroxide ions are identical, making the solution neutral. Based on how much they ionise in water, acids and bases are categorised as strong or weak. - Salt and water are typically produced when acids and bases react. When the amount of hydrogen ions and hydroxide ions are equilibrium in moles, neutralisation takes place. The weak acid neutralises the base when it is introduced to the mixture.
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An organism with the genotype of AaXx can produce gametes containing _________ if the two genes are unlinked.
a. either Aa or Xx
b. either AX, Ax, aX, ax
c. AaXx
d. AX or ax
e. None of the above.
An organism with the genotype of AaXx can produce gametes containing either AX, Ax, aX, ax if the two genes are unlinked .
An organism's genotype is the complete set of its genetic material. [1] Genotype can also be used to refer to the alleles or variants that an individual has at a particular gene or locus. The number of alleles an individual can have for a particular gene depends on the number of copies of each chromosome (also called polyploidy) found in that species. Diploid species like humans have two complete sets of chromosomes. This means that each individual has her two alleles for a particular gene. If both alleles are the same, the genotype is said to be homozygous. If the alleles are different, the genotype is called heterozygous.
Genotypes contribute to the phenotype, observable traits and characteristics of an individual or organism. The extent to which genotype influences phenotype depends on the trait.
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Epinephrine is a hormone secreted into the bloodstream in times of danger and stress. It is 59% Carbon, 7.1% Hydrogen, 26.2% Oxygen and 7.7% Nitrogen by mass. Determine the empirical formula. The molar mass is 148 g/mol.
Based o the percentage masses of the elements, the empirical formula of epinephrine is C₉H₁₃O₃N.
What is the empirical formula of epinephrine?The empirical formula of epinephrine is calculated below as follow:
Mole ratio of the elements are determined:
Carbon = 59% / 12
Carbon = 0.049 moles
Hydrogen = 7.1% / 1
Hydrogen = 0.07 moles
Oxygen = 26.2% / 16
Oxygen = 0.016
Nitrogen = 7.7% / 14
Nitrogen = 0.0055
The simplest whole-number ratio will be:
C = 0.049/0.0055
C = 9
Hydrogen = 0.07/0.0055
H = 13
Oxygen = 0.016/0.0055
Oxygen = 3
Nitrogen = 0.0055/0.0055
Nitrogen = 1
The empirical formula = C₉H₁₃O₃N
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Which of the following is an observation of a chemical property?
Ozinc reacts with hydrochloric acid
O
O water boils at 100°C.
Osand paper is roughly textured
density of wood is 0.51 g/cm³
Zinc reacts with hydrochloric acid is the correct observation of a chemical property and the right response to the question above.
Equation:
Zn +2HCL → ZnCl2 +H2
Balanced equation:
Zn +2HCL → ZnCl2 +H2
Atomic number 30 and the letter Zn identify zinc as a chemical element. When the oxidation is eliminated, zinc becomes shiny-greyish and becomes a somewhat brittle metal at normal temperature.
Zinc is a crucial trace element for all living things, including humans, animals, plants, and microbes. After iron, it is the trace metal found in humans in the second-highest concentration. As a crucial cofactor for several enzymes, zinc is also a crucial vitamin for development. Many disorders can be caused by a zinc shortage. slowing in growth, infection susceptibility, and diarrhea are among effects of deficiency in children. . Consuming too much zinc can result in copper shortage, ataxia, and sluggishness.
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Which if these options best describes the diagnostic cleavage that is typical of the mica group of minerals (which includes muscovite and bietet A) Three perpendicular cleavage planes B) Two cleavage planes intersecting at 90° C) Two cleavage planes intersecting at 120 D) A single planar cleavage
D ) The answer that best depicts the diagnostic cleavage that is typical of the mica group of minerals which include muscovite and bietet is a single, planar cleavage .
Cleavage is the splitting of minerals along natural planes of weakness
When there is only one cleavage plane, a single, planar cleavage known as the basal or pinacoidal cleavage takes place. cleaved at the base of the graphite. Mica (like muscovite or biotite) has basal cleavage, that's why mica can be peeled into thin sheets.
So single planar cleavage is answer of this question.
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based on the concepts of atomic structure and periodicity, propose a modification to the student's previous hypothesis to account for the compounds that form between halogens and fluorine
Atomic structure: odd number of F atoms; periodicity: the number of F atoms rises as the atomic number of the central halogen atom rises; ClF, ClF3.
A complicated configuration of negatively charged electrons organized in predetermined shells surrounding a positively charged nucleus is an atom. The majority of the atom's mass is located in this nucleus, which is made up of protons and neutrons (except for common hydrogen which has only one proton). The size of each atom is similar. The angstrom (), which is equal to one tenth of a meter, is a practical measure of length for calculating atomic sizes. A typical atom measures 2-3 in diameter.
Atomic structure physics as we know it now began with J. J. Thomson's discovery of the electron in 1897. Within the outlined energy shells surrounding the nucleus, the negatively charged electrons move in a random way. The amount and arrangement of an atom's electrons determine most of its properties.
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One of the most widely used isotopes in medical diagnostics is technetium-99m (the m indicates that it is a metastable isotope). Write the symbol for this isotope, indicating both mass number and atomic number. Express your answer as an isotope.
Atomic number of Technetium is 43, Mass number is 99 and symbol is Tc ,hence symbol of isotope is 99 m43 Tc
General representation of atom is AZ X
Where , A is mass number , Z is atomic number and X is symbol of element. Atomic number of Technetium is 43, Mass number is 99 and symbol is Tc ,hence symbol of isotope is 99 m43 Tc ,Where m stands for meta stable.
A chemical element with the atomic number 43 and the symbol Tc is known as technetium. It is the lightest element whose radioactive isotopes are all present. Technetium is a synthetic element that is created in abundance. The most prevalent source of naturally occurring technetium is uranium and thorium ores, where it spontaneously fissions as a byproduct, while molybdenum ores produce it as a byproduct of neutron capture. This crystalline, silvery-gray transition metal in group 7 of the periodic table is sandwiched between rhenium and manganese, and its chemical characteristics fall somewhere in the middle of the two nearby elements. Only in traces, 99Tc is the most prevalent naturally occurring isotope.
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Write the overall balanced cell reaction for the following voltaic cell Fe(s) | Fe2+ (aq) || Ag + (aq) | Ag(s) (Ctrl).
the overall balanced cell reaction for the following voltaic cell
Hg2Cl2(s) + Cu(s) ® 2Hg(l) + Cu2+(aq) + 2Cl-(aq)
The cell reaction, also known as the total reaction, is the reaction that occurs within the cell as a whole and is expressed under the assumption that the right electrode is the cathode and that the spontaneous reaction is the one in which reduction takes place in the right-hand compartment.Galvanic, also known as Voltaic, and electrolytic cells are the two varieties of electrochemical cells. While electrolytic cells utilize non-spontaneous reactions and therefore need an external electron source, such as a DC battery or an AC power source, galvanic cells get their energy from spontaneous redox reactions.
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Determine the structure of C6H10, which upon oxidation gives acetic and isobutyric acid
Answer:CH
3
CH
2
CH
2
C≡C−CH
3
Explanation:
with reference to compound a below, label each compound as an identical molecule, an isomer, a resonance structure, or neither.
Label for each of the compounds given in the question are: 1) Isomer, 2) Isomer, 3) Resonance Structure, 4) Isomer 5) Neither.
A group of two or more Lewis structures known as resonance structures describe the electronic bonding of a single polyatomic species, including fractional bonds and fractional charges. The number of electrons in resonance structures should be constant; do not add or subtract any electrons. (Count the electrons to determine their number). Every resonance structure complies with the standards for writing Lewis Structures. Structure hybridization must be constant. By cyclically moving elections, it is possible to depict the two resonance configurations of the benzene ring. Multiple resonance structures can be found in conjugated double bonds.
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given the reaction: 234 91 pa x 0 -1e when the equation is correctly balanced the nucleus represented by x is
The reaction is given : ²³⁴Pa₉₁ -----> X + ⁰e₋₁ , the equation is balanced and the nucleus represented by X is ²³⁴U₉₂.
The balanced reaction is given as :
²³⁴Pa₉₁ -----> X + ⁰e₋₁
This reaction is the balanced reaction and X is represented the nucleus and is given as : ²³⁴U₉₂.
The given reaction is the nuclear reaction. the nuclear reaction is the reaction in which the nuclides are produced by the collision between the two atoms nuclei. the nuclear reaction are of the two types the nuclear fission and the nuclear fusion reaction. the nuclear fission is the splitting of the large nuclei in to the smaller ones.
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Correct the volume of 2.90 L of a gas at –12 °C to the volume occupied at 25 °C. Remember to convert between °C and K.
The volume occupied at 25 °C. Remember to convert between °C and K. V2 = 3.311 L is the correct answer.
What is volume?
Volume is the measure of the amount of space occupied by an object or a substance. It is measured in three dimensions: length, width, and height. In the International System of Units (SI), it is measured in cubic meters (m3). Volume is also commonly measured in liters (L), gallons (gal), or cubic feet (ft3). Volume can also refer to the amount of a substance or object, such as the volume of a gas or the volume of a liquid.
Temperature and Volume equation
Given,
The volume at -12°C = 2.90L
Temperature, T1 = -12°C
= (-12°C + 273)
= 261K
And, Volume at 25°C = ?
(25°C + 273)K
= 298K
Now, by using this equation:-
V1/T1 = V2/T2
V2 = V1 x T2/T1
V2 = 2.90L x 298K/261K
V2 = 3.311L
Hence, The volume at 25°C will be 3.311L
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Suppose the galvanic cell sketched below is powered by the following reaction: Fe(s)+NiCl2(aq) → FeCl2(aq)+Ni(s) E2 S1 S2 Write a balanced equation for the half-reaction that happens at the cathode of this cell. Write a balanced equation for the half-reaction that happens at the anode of this cell. Of what substance is E1 made? of what substance is E2 made? What are the chemical species in solution S1? What are the chemical species in solution S2?
The chemical species in solution S2 Fe(s)+NiCl2(aq) → FeCl2(aq)+Ni(s)
Fe(s) ------> [tex]Fe^{2+}[/tex] + 2e (Oxidation)
[tex]Ni^{2+}[/tex] (aq) + 2e ------> Ni(s) (Reduction)
Galvanic Cell
Galvanic cells employ the electrical energy generated by the transport of electrons during a redox reaction to carry out practical electrical work. By separating the oxidation and reduction half-reactions and connecting them with a wire so that the electrons must pass through the wire, it is possible to gather the electron flow.
Write a balanced equation for the half-reaction that happens at the cathode of this cell = Ni (aq) + 2e ------> Ni(s)
Write a balanced equation for the half-reaction that happens at the anode of this cell = Fe(s) ------> [tex]Fe^{2+}[/tex] + 2e.
Of what substance is E1 made? = Fe
of what substance is E2 made? = Ni
What are the chemical species in solution S1? = [tex]Fe^{2+}[/tex]
What are the chemical species in solution S2? = [tex]Ni^{2+}[/tex]
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For the reaction of X (represented by circles) and Y (represented by squares), the rate law has been determined to be: rate=k[X][Y]^2.Which of the following will produce the fastest rate for the reaction?ABCD
Ozone decomposes to oxygen according to the equation 2O₃(g)⟶3O₂(g). Create the equation that ties the rate expressions for this reaction to the creation of oxygen and the disappearance of O₃.
Given that there are more reactants in a given volume of space, increasing the concentration of reactants improves the likelihood that they will collide in the proper direction. As a result, the reactions rate would increase if the reactants were concentrated more. more often with each other. As a result, the reaction progresses more quickly as the temperature rises. Since the molecules will have less kinetic energy, travel more slowly, and collide less frequently as a result of a lower temperature, the rate of reaction will also be reduced.
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using curved arrow notation, write lewis acid/base equations for each of the following. remember to place formal charge on the appropriate atoms. a. aici3- b. phyp: bf3 bh3
AlCl 3 is Lewis base,PH3 is Lewis base,BH3 is Lewis acid ,BF3 is Lewis acid.
The crucial step is AlCl 3 accepting a chloride ion lone-pair to generate AlCl 4 and the highly acidic, or electrophilic, carbonium ion. Lewis bases: RCl +AlCl 3 → R + + AlCl 4−, etc. [ edit] The highest occupied molecular orbital (HOMO) of an atomic or molecular species that is strongly localised is known as a Lewis base.Lewis acid borane (BH3) has three hydrogen atoms and one boron atom in its molecule. The Lewis structure of borane features a single connection connecting each hydrogen atom to boron (BH3). Only three bonds surround the boron atom, and there are no lone pairs on the atom itself. We will learn how to draw the BH3 Lewis structure in this lesson.Only six electrons orbit the boron atom, according the Lewis structure of BF3. As a result, the boron atom's octal is incomplete. Borane BF3 is therefore regarded as a Lewis acid.A highly poisonous gaseous chemical is phosphorus. Three sigma bonds and one lone pair are present around the phosphorus atom in the Lewis structure of phosphine (PH3). Hydrogen and phosphorous atoms have no charges. The trigonal pyramidal shape of PH3 is a fundamental shape.
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Consider the half reactions one more time. Will the reaction as written here occur spontaneously?
Fe2+ (aq) +2 e-→ Fe(s) E° = -0.447 V
Cu2+ (aq) +2 e-→ Cu(s) E° = 0.342 V
Fe2+ (aq) + Cu(s) → Cu²+ (aq) + Fe(s)
yes or no or need more information
To solve such we need to have concept of spontaneity. The terms "feasible" and "likely" are both used to describe spontaneous processes. Therefore, second reaction will occur spontaneously.
What is spontaneity?The word "spontaneity" refers to a process's viability. A process is referred to as spontaneous if it can occur either on its own or as the result of some initiation under a certain set of circumstances. In other terms, a spontaneous process is one that may happen on its own, without any outside intervention.
For a reaction to be spontaneous, the value for ΔG should be negative and for that cell potential should be positive value according to following equation.
ΔG=-nFE
ΔG = Gibbs's free energy
E= cell potential
F= 96500
n= number of electron
Therefore, second reaction will occur spontaneously.
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Voltaic cells are able to provide energy in the form of electricity because the potentials of their redox reactions permit electrons to flow
spontaneously.
true or false
Answer: True. Voltaic cells, also known as galvanic cells, are able to provide energy in the form of electricity because the potentials of their redox reactions permit electrons to flow spontaneously. Redox reactions involve the transfer of electrons from one species to another, and the flow of electrons through a circuit can be used to do work, such as powering an electric motor or a lightbulb. The potential difference between the two half-cells in a voltaic cell is called the cell potential, and it determines the direction and magnitude of the flow of electrons.
Explanation:
The density of an unknown element in the gaseous state is 1.60 g at 300 K and 1 atm. Which of the following could be the element?
a. He
b. Ne
c. Ar
d.O2
e. Cl2
High-purity benzoic acid (C6H₂COOH; AHxn for combustion = -3227 kJ/mol) is used as a standard
for calibrating bomb calorimeters. A 1.221-g sample burns in a calorimeter (heat capacity = 1365 J/°C)
that contains exactly 1.240 kg of water. What temperature change is observed?
°℃
According to the given statement 5 °C temperature change is observed.
How does a calorimeter function and what is it?The variation in heat is measured by a calorimeter. A metal water container placed above an exhaust gases serves as the basic component of a calorimeter. The amount of water's temperature change is measured using a thermometer.
Briefing:The calorimeter burns a 1.221g sample.
The calorimeter contains 1.240 kg of water .
The calorimeter has a heat capacity of 1365 j/°C.
∆H rxn = -3227 kj/mol of benzoic acid
Given: 1.221 g is the mass of the benzoic acid
Benzoic acid's molecular weight is 122.12 g/mol.
122.12 g benzoic acid = 1 mol
1.221 g benzoic acid =1.221/122.12= 0.0099 moles
When burned, 1 mol of benzoic acid releases 3227 kj of energy.
Burning 0.0099 moles of benzoic acid produces energy
= 3227kj×(0.0099mols)/1 mol =32.2647 kj =32264.7 j
The calorimeter absorbed thermal energy
= 1365 j/C ×T
Water absorbs heat
= m× C× T
= 1240 g( 4.18 j/gC ) ×T
= 5183.2j/C×T
the total amount of heat absorbed
= 1365T + 5183.2T
=6548.2T
6548.2T=32264.7
T= 4.92 deg.C
T= 5 °C
The result is a 5 °C temperature change.
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Consider the following reaction at 276 K.
1 A + 2 B → C + D
where rate = rate=k[A][B]2. An experiment was performed for a certain number of seconds where [A]o = 0.000847 M and [B]o = 1.11 M. A plot of ln[A] vs time had a slope of -9.43. What will the rate of this reaction be if a new experiment is preformed when [A] = [B] = 0.779 M?
1 A + two C and d → C + S t where rate=k[A][B][rate] 2. An experiment with [A]o = 0.000847 T s as well as [B]o = 1.11 M was run for a predefined number of seconds. The slope of a ln[A] vs. grown steadily was -9.43. rate of reaction is 3.62m/s
Slope and slant both refer to an incline up from a reference surface or line that is generally straight. The ground slopes (either upward or straight down) sharply here. To slope is to slope vertically in an ambiguous path A line's steepness could be determined by looking at its slope. Altitude is calculated mathematically as "rise over run."
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Which of the following is an example of an endothermic process?
Select the correct answer below:
a. melting ice cubes
b. burning sugar
c. a candle burning
d. condensation of rain from water vapor
An endothermic process from the list would be the melting of ice cubes. Option A.
What are endothermic processes?Endothermic processes are processes that absorb energy from the surrounding. Chemically, endothermic reactions are reactions in which the products are at higher energy level than the reactants.
Endothermic processes are different from exothermic processes. Exothermic processes are processes that gives off energy to the surrounding instead of taking from it.
In order for ice cubes to melt, they need to absorb energy from external sources. In order words, the melting of ice cubes is analogous to an endothermic process.
Burning of sugar and candle give off heat energy to the surrounding. When water vapor condenses, they also give off energy in order to change state from gas (vapor) to liquid. In other words, the burning of sugar and candle, as well as the condensation of rain from water vapor are all exothermic processes.
The only process that is endothermic is the melting of ice cubes.
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