The net cell equation for the electrochemical cell Co(s)|Co2+ (aq)||Ag+ (aq)|Ag(s) is: Co(s) + 2Ag+(aq) → Co2+(aq) + 2Ag(s)
The electrochemical cell of Cobalt (Co) consists of two electrodes, one of Cobalt (Co) and the other of Silver (Ag).
The net cell equation for this cell is Co(s) + 2Ag+(aq) → Co2+(aq) + 2Ag(s), indicating that when two moles of Silver ions (Ag+) are combined with one mole of Cobalt (Co), two moles of Cobalt ions (Co2+) and two moles of Silver (Ag) are produced.
This cell reaction is an example of redox (oxidation-reduction) reaction, in which there is a transfer of electrons between the two electrodes.
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d. Calculate the concentration of C5H6 when 250 seconds have passed.
e. On the plot of [C5H6] ^ - 1 vs. time, draw a line that shows the results that would be expected if the same experiment was repeated at a lower temperature.
The concentration of C₅H₆ when 250 seconds have passed is 0.015 M. e. The slope of the plot will be less steep at a lower temperature.
What is concentration or molar mass?The molar mass of many compounds can be calculated by dividing the mass of the compound by the number of moles of the compound.
d.
[C5H6]0⁻¹ = 25 M⁻¹
t = 250 s
k = 0.17 M⁻¹ s⁻¹
Now, substituting these values in the integrated rate law to get,
[C5H6]⁻¹ = 0.17 M⁻¹ s⁻¹ x 250 s + 25 M⁻¹
= 67 M⁻¹
or,
[C5H6] = 1/67 M⁻¹
= 0.015 M
e.
According to the Arrhenius equation, the rate constant of a reaction decreases with temperature.
Therefore, d. the concentration of C₅H₆ is 0.015 M.
e. At lower temperatures, the slope of the plot will be less steep.
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The question is incomplete. Your most probably complete question is given below:
The full question and the graph are added.
if the volume of the reaction vessel in the previous part was 1.50 ll , what amount of br2br2 (in moles) was formed during the first 15.0 ss of the reaction?
The 15s of the reaction saw 0.0153 moles of Br2 being produced.
Relational Equation
H2 + Br2 > 2HBr
According to the reaction's equation, [HBr] = [H2] + [Br2] = -1/2 [HBr]/[t]
The amount of HBr decreased from 0.520M to 0.486M in the initial 25 seconds of the reaction.
Average Rate of Reaction Rate =-1/2 ([HBr]f- [HBr]t/i
Rate = -1/2 (0.486-0.52/2)
Rate: 0.00068 M/s
0.00068M/s is the reaction's average rate.
Rate of the response is
Rate= [Br2]/t 0.00068= [Br2]/15 Br2= 0.00068 15= 0.0102M
In the reaction, Br2 is present in 0.0102M concentration.
Number of Moles The amount of Br2 produced in the first 15 seconds can be determined using the formula: Number of moles=molarity×volume, where n = 0.0102 and 15 = 0.0153 mol.
0.0153 moles of Br2 were created in the reaction, according to the calculations above.
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for many years drinking water has been cooled in hot climates by evaporating it from the surfaces of canvas bags or porous clay pots. how many grams of water can be cooled from 35 to 20 degree c by the evaporation of 60 g of water (the heat of vaporization of water in this temperature range is 2.4 kj/g. the specific hear of water is 4.18 j/g-k.)
The mass in the grams of water can be cooled from 35 to 20 degree c by the evaporation of 60 g of water is the 2296.6 g.
Given that :
ΔH = heat of vaporization = 2.4 kJ/g = 2400 J/g
Mass of the water = 60 g
q = ΔH m
q = 2400 × 60
q = 144000 J
The heat expression is given as :
q = mc ΔT
q = 144000 J
m = ?
c = 4.18 J/ g k
ΔT = 308 K - 293 K = 15 K
m = q / c ΔT
m = 144000 / 4.18 × 15
m = 2296.6 g
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Answer: 127.46 g
Explanation:
ΔH = heat of vaporization = 2.4 kJ/mol = 2400 J/mol
Mass of water = 60 g
Moles of water = 60 g/18 g/mol = 3.33 moles
q = ΔH × moles
q = 2.4 kJ/g × 3.33 mol
q = 2400 J × 3.33 mol
q = 7992 J
The heat expression is given as :
q = 7992 J
m = ?
c = 4.18 J/g × k
ΔT = 308 K - 293 K = 15 K
q = mcΔT
m = q/cΔT
m = 7992/4.18 × 15
m = 127.46 g
ozonolysis of molecule a would result in the formation of what two functional groups? a ketone and an aldehyde two carboxylic acids two aldeydes two ketones
Which two functional groups would be created by the ozonolysis of molecule a Me2C = CHMe produces aldehydes and ketones during ozonolysis, providing all the other alternatives no aldehydes.
What does ozonolysis entail as a reaction?To cleave those unsaturated bonds in alkenes, alkynes, etc azo compounds, ozone is used in the organic chemical process known as ozonolysis.
Ozonelysis example: What is it?Pentane will occur from the reaction, for instance, between bromoethane and I-bromopropane. When each of the participants in the reaction reacts on their own, butane will also be produced. For instance, 1-bromopropane produces hexane, while bromoethane produces butane.
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If Ka is 1.85x10^-5 for acetic acid, calculate the pH at one half the equivalence point and at the equivalence point for a titration of 50mL of 0.100M acetic acid with 0.100M NaOH.
The pH at one half the equivalence point and at the equivalence point for a titration 8.716.
What does titration mean in terms of chemistry?Titration is a method of chemical analysis where the quantity of a sample's constituents is determined by adding a precisely measured amount of a different substance to which the desired constituent will react in a specific, known proportion.
What is titration, and what does it do?The equivalence point, or the point at which chemically equivalent amounts of the reactants have been combined, is to be detected by the titration. The stoichiometry of the reaction determines how many reactants have been combined at the equivalence point.
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In regard to the E2 mechanism, rank the leaving groups in order of increasing reaction rate. R-Cl, R-I, R-F, R-Br
B)what's iupac name of the following compund?
The type of the halide's leaving property determines how quickly an alkyl halide will undergo an E2 reaction. A set of systematic guidelines for using with organic molecules are the IUPAC nomenclature.
The E2 mechanism is what.In one method, the bromine in an SN2 reaction is replaced with a methanethiolate nucleophile. In the alternative (bottom) pathway, the methoxide ion participates inside an elimination reaction as a base instead of a nucleophile.
How does the rate for E2 reactions change when people leave groups?Consequently, the quicker the E2 reaction, the better this leaving group is in E2 interactions as well. Below is a list of the most typical leaving group in nucleophilic replacement and removal reactions: As we previously established, the quicker the E2 elimination, the stronger the base.
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Which equation is the balanced chemical equation for the synthesis reaction for the formation of sulfur dioxide (SO₂)?
A.) 2S+0₂ → SO₂
B.) S+20₂4S02
C.) S+0₂2SO2
D.) S+O₂ → SO₂
The equation that is balanced for the synthesis reaction for the formation of sulfur dioxide (SO₂) is as follows: S + O₂ → SO₂ (option D).
What is synthesis reaction?A chemical reaction is a process typically involving the breaking or making of interatomic bonds, in which one or more substances are changed into others.
A synthesis or combination reaction is a specific type of chemical reaction that involve two or more chemical species combining to form a more complex product:
A + B → AB
According to this question, sulfur combines with oxygen in a synthesis reaction to form sulfur dioxide as follows: S + O₂ → SO₂.
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a compound containing 5.9265% hydrogen and 94.0735% oxygen has a molar mas of 34.01468g/mol. determine the emperical and molecular formula of this compound
A substance with a molar mass of 34.01468g/mol and an empirical formula of Hydrogen and oxygen and a molecular formula of twice has a composition of 5.9265% hydrogen and 94.0735% oxygen.
Thus Molecules are described by the empirical formula, where n = 1, 2, and 3. You can use the empirical formula to ascertain the molecular formula if you are aware of the molar mass of the chemical. Calculate the empirical formula mass first, and then divide the compound molar mass by it to get the empirical formula mass. Compounds are chemical entities comprised of a large number of comparable molecules.
Empirical equation equals Molecular formula
Hydrogen = 5.9265/atm weight: 5.9265/5.8795 = 1 (approximately)
Oxygen = 94.0735/16: 5.8795/5.8795 = 1
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Write equations showing how each of the following weak bases ionizes water to form OH?.
CO2?3
Express your answer as a chemical equation. Identify all of the phases in your answer.
C6H5NH2
Express your answer as a chemical equation. Identify all of the phases in your answer.
C2H5NH2
Express your answer as a chemical equation. Identify all of the phases in your answer.
The following species produce OH- in water using the following reaction equation:
CO3^2-(aq) + H2O(l) -------> HCO2^-(aq) + OH^-(aq)
C6H5NH2(aq) + H2O(l) -------> C6H5NH3^+(aq) + OH^-(aq)
C2H5NH2(aq) + H2O(l) -------> C2H5NH3^+(aq) + OH^-(aq)
What is weak base?Bases produce OH- when they react with water. A weak base is a substance that ionizes only to a small extent in water. A weak base remains largely undissociated in water. Recall that bases produce OH- in solution.
Here,
The equation of the reaction by which the following species produce OH- in water are shown below;
CO3^2-(aq) + H2O(l) -------> HCO2^-(aq) + OH^-(aq)
C6H5NH2(aq) + H2O(l) -------> C6H5NH3^+(aq) + OH^-(aq)
C2H5NH2(aq) + H2O(l) -------> C2H5NH3^+(aq) + OH^-(aq)
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if you are working with a chemical and need to find out about the routes of exposure, as well as the short and long term effects of exposure, where on the sds would you look?
If you need to learn more about the exposure pathways, as well as the immediate and long-term impacts of exposure, when dealing with a chemical, Toxicological Information Section 11
What are the consequences of toxicity?Additionally possible symptoms include mortality, cyanosis, a headache, weakness, dizziness, shortness of breath, and cyanosis. Ingestion can irritate the digestive system and trigger nausea and vomiting. According to reports, DAAB can cause methemoglobinemia after being inhaled, ingested, or absorbed via the skin.
Toxicology: What is it?A branch of research known as toxicology aids in our understanding of the potentially hazardous consequences that certain materials, settings, and events may have on humans, animals, and the environment.
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Match each element with the charge it will have when it becomes an ion. aluminum rubidium selenium nitrogen neon chlorine barium
According to electronic configuration, when elements become ion, aluminum, rubidium ,selenium, nitrogen, neon, chlorine, barium loose 3 electrons,1 electron, gain 2 electrons , gain 3 electrons,neon is stable, chlorine gains 1 electron and barium looses 2 electrons.
What is electronic configuration?Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.
Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.
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a chemistry student needs of tetrahydrofuran for an experiment. by consulting the crc handbook of chemistry and physics, the student discovers that the density of tetrahydrofuran is . calculate the volume of tetrahydrofuran the student should pour out. be sure your answer has the correct number of significant digits.
The density of tetrahydrofuran needed for a chemistry student to do the experiment is 0.888 g/mL
Is water less dense than tetrahydrofuran?Tetrahydrofuran has an ethereal smell and is visible as a transparent, colourless liquid. not as dense as water. 6 °F flash point Air is lighter than vapours.
The finest solvent is tetrahydrofuran, why?Because it can dissolve different resins even at room temperature and is miscible with water and the majority of organic solvents, THF is frequently employed as a solvent for specialised resins such photosensitive resins. Additionally, it serves as a solvent for Wittig and Grignard processes.
Tetrahydrofuran and water: do they mix?Regardless of the sequence of introduction, if two compounds are totally soluble in one another, they are said to be miscible. Tetrahydrofuran (THF), for instance, and water mix well.
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classify the following as physical or chemical changes. a. moth balls gradually vaporize in a closet. b. hydrofluoric acid attacks glass, and is used to etch calibration marks on glass laboratory utensils. c. a french chef making a sauce with brandy is able to burn off the alcohol from the brandy, leaving just the brandy flavoring. d. chemistry majors sometimes get holes in the cotton jeans they wear to lab because of acid spills.
a.) Physical change ; b.) chemical change. c.) Chemical change d.) chemical change.
What is physical and chemical change?In physical change, there is no change in the chemical composition of the substance and change is only on physical properties. In chemical change, there is the combination of two or more substances that combine to form a new one.
a.) Mothballs gradually vaporize in closet is the -- Physical change
b.) Hydrofluoric acid attacks glass and is used to etch calibrations marks on glass laboratory utensils is the -- chemical change.
c.) French chef making sauce with brandy is able to burn of the alcohol from the brandy leaving just the brandy flavoring is-- Chemical change
d.) Chemistry major sometimes get holes in the cotton jeans they wear to lab, because of the acid spills is the-- chemical change.
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Explain why equilibrium constants are dimensionless?
Answer:
equilibrium expressions do not have units because the concentration or pressure terms that go into them are really ratios having the forms (n mol L–1)/(1 mol L–1) or (n atm)/(1 atm) in which the unit quantity in the denominator refers to the standard state of the substance
Explanation:
Which of the following pairs of elements would be most likely to form an ionic compound AP and BR B Zn and KCC and OD Al and RB?
Cl and K. the following pairs of elements would be most likely to form an ionic compound AP and BR B Zn and KCC and OD Al and RB A chemical element is a type of atom.
with a certain number of protons in its nucleus, including the pure material made up entirely of that species. [1] Chemical elements, unlike chemical compounds, cannot be broken down into simpler substances by any chemical process. The number of protons in the nucleus is an element's distinguishing attribute, and it is symbolized by the symbol Z - all atoms with the same atomic number are atoms of the same element. [1] Almost all of the universe's baryonic stuff is made up of chemical elements (among rare exceptions are neutron stars).Cl and K. the following pairs of elements ould be most likely to form an ionic compound AP and BR B Zn and KCC and OD Al and RB A chemical element is a type of atom.
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how do i solve this with showing all work
0.750 tsp of baking soda in grams would be 4.49 grams.
Dimensional analysisFrom the available information:
1 tsp of baking soda = 0.211 oz1 oz = 28.35 gramsIf, 1 tsp of baking soda = 0.211 oz, then 0.750 tsp of baking soda would be:
0.750 x 0.211 = 0.15825 oz
Thus, 0.750 tsp of baking soda is equivalent to 0.15825 oz of baking soda.
If 1 oz = 28.35 grams, then 0.15825 oz of baking soda will be:
28.35 x 0.15825 = 4.49 grams
In other words, 0.750 tsp of baking soda would be worth 4.49 grams of baking soda going by the available conversion factors.
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Rank the following in order of increasing polarity: CH2Br2, CF2Cl2, CF2Br2, CBr4 A. CH2Br2 < CF2Br2 < CF2Cl2 < CBr4 B. CBr4 < CH2Br2 < CF2Cl2 < CF2Br2 C. CH2Br2 < CF2C12 < CF2Br2 < CBr4 D. CBr4 < CF2Br2 < CF2Cl2 < CH2Br2 E. CBr4 < CH2Br2 < CF2Br2 < CF2Cl2
CBr4 < CH2Br2 < CF2Br2 < CF2Cl2 Polar molecules contain polar bonds and can be ordered from most to least polar based on the polarity of their bonds.
What is polar bonds?Polar bonds are chemical bonds between atoms in which the sharing of electrons is not equal. Polar bonds are caused by the difference in electronegativity between the two atoms involved in the bond. Electronegativity is the measure of an atom's ability to attract electrons to itself.
CBr4 has the most polar bond and is therefore the most polar molecule. CH2Br2 has the second most polar bond, followed by CF2Br2, and then CF2Cl2 with the least polar bond.
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What must be the temperature (K) if the following reaction has ΔG°= -38.5 kJ, ΔH°= -14.6 kJ, and ΔS°= 0.152 kJ/ K?
Fe2O3 (s) + 3CO (g) → 2Fe (s) + 3CO2 (g)
The temperature (T) at which the given reaction has ΔG°=-38.5 kJ, ΔH°=-14.6 kJ, and ΔS°=0.152 kJ/K is 1273.7 K.
What is temperature?Temperature is a physical property of matter that measures the average kinetic energy of the particles in a system. It is measured by thermometers and expressed in units such as degrees Fahrenheit (°F) and degrees Celsius (°C). Temperature is a fundamental factor in determining the nature of the physical and chemical changes that occur in matter.
The temperature (T) that corresponds to the given ΔG°, ΔH°, and ΔS° values can be determined using the equation ΔG° = ΔH° - TΔS°.
Substituting the given values yields:
-38.5 kJ = -14.6 kJ - T(0.152 kJ/K)
Rearranging yields:
T = -38.5 kJ + 14.6 kJ / 0.152 kJ/K = 1273.7 K.
Therefore, the temperature (T) at which the given reaction has ΔG°=-38.5 kJ, ΔH°=-14.6 kJ, and ΔS°=0.152 kJ/K is 1273.7 K.
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What volume of 0.0887 M MgF2 solution is needed to make 275 mL of 0.0224 M MgF2 solution by dilution? a. 69.4 mL b. 72.3 mL c. 14.4 mL d. 91.8 mL
By dilution, 275 mL or 0.0224 MgF2 solution can be created from 69.4 mL of 0.0887 MgF2 solution.
What exactly does "dilution" mean?By adding extra more solvent, such as water, to the solution, dilution is indeed the process of "reducing the concentration of the solute in a solution." A solution is diluted by adding additional solvent without also adding more solute.
What various dilutions are there?An approach used frequently to achieve this concentration reduction is serial dilution. diluted homeopathy. An equation called "dilution" can be used to determine how quickly a gas diluted. A sort of unauthorized trademark usage outside the relevant market is trademark dilution.
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Select the ΔH values associated with the dissolution of lithium chloride that are exothermic.
Check all that apply.
ΔH1: energy associated with the separation of water molecules
ΔH2: energy associated with the separation of LiCl ions
ΔH3: energy associated with the formation of water-ion interactions
ΔHsoln: the enthalpy of solution
The correct statement that are exothermic is energy associated with the formation of water-ion interaction.
An exothermic reaction is the one during which system releases energy and during an endothermic reaction system absorbs energy.
Option 1 is incorrect as water molecules do not undergo ionization when added to water and thus no energy is released.
Option 2 is incorrect because the separation LiCl into subsequent ions requires a significant amount of energy and thus it will be a endothermic reaction.
Option 3 is correct as the formation of water ion releases a large amount of energy and thus it is an endothermic reaction.
Option 4 is also correct as it is the energy associated with the whole system.
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the remaining mass of 28 grams of a radioactive element whose half life is 20 years is given by the following equation, after t years. how much of the initial mass remains after 100 years?
The remaining mass of 28 grams of a radioactive element whose half life is 20 year. The initial mass remains after 100 years is 0.875 grams
The radioactive substance weighs 28 grams at first. The radioactive element has a half-life of 20 years. After t years, the mass y(in grams) that is left is calculated using the equation below
y=28(1/2)^t/20 ,t ≥ 0
Consequently, the quantity of initial mass that is still present after 100 years would be
y=28(1/2)^t/20 ,t ≥ 0
y=28(1/2)^100/20
y=28(1/2)⁵
y = 0.875 grams of the initial mass remain
Therefore, after 100 years, there will still be 22.0.875 grams of the starting mass.
Your question is incomplete but most probably your full question attached below
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Which of the following best describes the change that takes place immediately after the CH₂OH(1) is introduced into the previously evacuated vessel? (A) A chemical change takes place because covalent bonds are broken. (B) A chemical change takes place because intermolecular attractions are overcome. (C) A physical change takes place because covalent bonds are broken. (D) A physical change takes place because intermolecular attractions are overcome.
When CH2OH is introduced into the previously evacuated vessel , A physical change takes place because intermolecular attractions are overcome. The correct option to this question is D.
Remove (or evacuate) the air between two glass tubes to form a vacuum and reduce heat loss through conduction and convection.
Methanol is known to contain extremely polar oxygens, so it can exhibit hydrogen bonding. It is known that methanol can form very strong hydrogen bonds. Hydrogen bonds are known to form when the positive charge of hydrogen atoms accumulates significantly.
Hydrogen bonding is a unique type of inter-dipole attraction between molecules rather than covalent bonding to hydrogen atoms. This results from the attraction between a hydrogen atom bonded to an extremely electronegative atom such as an O, N, or F atom and an additional extremely electronegative atom.
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The decomposition of HI(g) H I ( g ) is represented by the equation 2HI(g)?H2(g)+I2(g) 2HI (g) ? H2 (g) + I2 (g) The following experiment was devised to determine the equilibrium constant of the reaction. HI(g) HI (g) is introduced into five identical 400-cm3 glass bulbs, and the five bulbs are maintained at 623 K .The amount of I2 produced over time is measured by opening each bulb and titrating the contents with 0.0150 M Na2S2O3(aq) Na2S2O3 ( a q ) . The reaction of I2 I 2 with the titrant is I2+2Na2S2O3?Na2S4O6+2NaIIn which bulb would you expect the composition of gases to be closest to equilibrium? bulb 1 bulb 2 bulb 3 bulb 4 bulb 5
The majority of a hydrocarbon mixture which makes up natural gas is composed of the two saturate light paraffins methane and ethane, which are gaseous in an atmosphere.
What is meant by equilibrium?During a reversible chemical process, chemical equilibrium is the state in which there is no net change in the quantity of reactants or products. As "balancing" is the definition of the word "equilibrium," it follows that what a chemical process represents an equilibrium between the products and reactants involved in the reaction. a situation in which opposing forces are acting in balance or at rest. equitable distribution of all forces, effects, etc.; equal impact. emotional or mental equilibrium; equanimity: She lost it under the burden of the circumstances.
What causes equilibrium in chemistry?Chemical equilibrium is the condition of a system in which the parameters of the system remain constant over time and neither the reactant concentration nor the product concentration changes. The system enters chemical equilibrium when the forward reaction rate and the reverse reaction rate are equal.
The percentages of nitrogen, oxygen, argon, and other gases, respectively, in the Earth's atmosphere are around 78%, 21%, 0.9 percent, and 0.1%. Other gases that make up the remaining 0.1 percent include minute amounts of neon, carbon dioxide, and methane. Substances called gases are those that can exist under one atmosphere of pressure. The 11 gases are oxygen, neon, krypton, radon, xenon, hydrogen, chlorine, and fluorine. These are referred to be pure gases since they are all elements.
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plese hurrrrrrrrrrry
Use the terrestrial ecosystem food web to answer this question.
Terrestrial Ecosystem Food Web
Leopards eat baboons and impalas in a terrestrial ecosystem. What prediction can be made if the baboon population begins to decrease because of disease?
Question 5 options:
The leopard population will increase.
The scorpion population will decrease.
The impala population will decrease.
The hawk population will increase.
Answer:
The impala population will decrease.
Explanation:
We learn that leopards eat both baboons and impalas. If one of these two species is reduced in abundance, the leopards will increase consumption of the alternative, in this case impalas. An analogy: If you eat only chicken and beef, and the local store ran out of chicken, you'd choose beef, as everyone else in the same predicament. The leopards see fewer baboons because of the disease, so they'll start hunting more impalas, and the impala population will decrease.
I don't know how to use that term in this explanation, can someone help me? I'd deeply appreciate it! :)
Explain how lenses in glasses or contacts need to change the light waves that enter the eye for a person who is
Nearsighted
Farsighted
Use the terms convex and concave in your answer.
Answer:
Glasses or contact lenses correct vision because they allow the eye to focus light in the right spot on the retina the spot that produces the clearest image. Because everyone's eyes are different, a pair of glasses that makes one person see wonderfully may look terribly blurry to someone else.
Nearsighted- unable to see things clearly unless they are relatively close to the eyes, owing to the focusing of rays of light by the eye at a point in front of the retina; myopic.
Farsighted- a common vision condition in which you can see distant objects clearly, but objects nearby may be blurry. The degree of your farsightedness influences your focusing ability.
Explanation:
I hope that makes sense
Calculate the energy required to heat 712.0 g of graphite from 2.0 °C to 20.7 °C. Assume the specific heat capacity of graphite under these conditions is 0.710 J-g-K Round your answer to 3 significant digits.
To calculate the energy required to heat a substance, we can use the formula:
Q = mcΔT
where Q is the heat energy, m is the mass of the substance, c is the specific heat capacity, and ΔT is the change in temperature.
Given that we have 712.0 g of graphite, a specific heat capacity of 0.710 J/g-K, and a temperature change of 18.7 °C (20.7 °C - 2.0 °C)
Q = (712.0 g) x (0.710 J/g-K) x (18.7 °C)
Q = 10,965.64 J.
The energy required to heat 712.0 g of graphite from 2.0 °C to 20.7 °C is 10.965 kJ.
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A sample of silica gel (SiO₂) contains 7.52 x 10^22
molecules of SiO2. How many moles of SiO2
molecules does this sample contain?
The number of moles in 7.52 × 10²² molecules of silicon dioxide is 0.125 moles.
How to calculate number of molecules?The number of moles in a substance can be calculated by dividing the number of molecules by Avogadro's number as follows:
no of moles = no of molecules ÷ 6.02 × 10²³
According to this question, a sample of silica gel (SiO₂) contains 7.52 x 10²² molecules of silica. The number of moles can be calculated as follows:
no of moles = 7.52 × 10²² ÷ 6.02 × 10²³
no of moles = 1.249 × 10-¹
no of moles = 0.125moles
Therefore, 0.125 moles are present in 7.52 × 10²² molecules of silica.
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For which one of the following reactions will delta H be approximately (or exactly) equal to delta E?H2(g) + Br2(g) ---> 2HBr(g)H2O(l) ---> H2O(g)CaCO3(s) ---> CaO(s) + CO2(g)2H(g) + O(g) ---> H2O(l)CH4(g) + 2O2(g) ---> CO2(g) + 2H2O(l)
The reaction for which delta H will be approximately (or exactly) equal to delta E is CH4(g) + 2O2(g) ---> CO2(g) + 2H2O(l).
What is reaction?Reaction is the process of responding to a stimulus or event. It can refer to a physical response, such as a reflex, or an emotional response, such as a feeling. Reactions can be conscious or unconscious, automatic or deliberate, and can occur in any living organism. In psychology, reactions are studied to understand how they shape behavior and to identify underlying mental processes. Reaction time, or the time it takes to respond to a stimulus, can also be measured and studied.
This is because this reaction is an exothermic reaction, which means that the energy released by the reaction is equal to the enthalpy change of the reaction.
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imagine you are working in a lab and a crystal of benzoic acid touches bare skin on your wrist. why would the advice cited above not be applicable in this situation and what would be a more appropriate response?
The advice cited above would not be applicable in this situation because benzoic acid is not a corrosive material.
What is material?Material is any object or substance that is used to create something else. It is a physical substance that can be manipulated and transformed in some way to make it useful. Materials can be natural, such as wood, stone, and metal, or they can be synthetic, such as plastic, fabric, or rubber. Depending on the purpose, materials can range from strong and durable to soft and flexible. In the construction industry, materials are chosen for their strength, durability, and cost-effectiveness. In manufacturing, materials are chosen for their ability to be formed and shaped into the desired product. In the arts, materials are chosen for their aesthetic properties and potential to create something unique and visually stimulating.
A more appropriate response would be to thoroughly wash the affected area with soap and water and seek medical attention if irritation or pain persists.
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For cis-1,3-dimethylcyclohexane, which structures represent the possible boat conformations?- a- b- c- d
The structures in option A and D correctly represents structure of cis-1,3-dimethyl cyclohexane.
How does cyclohexane confirmation take place?There are three stable conformations of cyclohexane. Chair, boat, and twist boat are them. The chair conformation is the most stable of the three. Each carbon atom in the cyclohexane's boat shape has two different sorts of groups. Both axial and equatorial groups describe them. From the provided boat conformations, we should determine the cis conformations.
Two substituents are in up, up (or) down, down to each other in boat conformation if they are cis to one another. Two substituents are in up, down, or down, up to each other in boat conformation if they are trans to one another.
In boat conformation A, both methyl groups are in up direction.
In boat conformation-B and C, one methyl group is in up direction and other one is in down direction.
In boat conformation D, both methyl groups are in down direction.
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The complete question is as follows :
For cis-1,3-dimethylcyclohexane, which structures represent the possible boat conformations?- a- b- c- d:
