Answer:
Elements have more energy levels, cannot pull in the electrons tightly, and have a lower ionization energy.
Explanation:
(a) 1.42 light-years to miles (a light-year is an astronomical measure of distance—the distance traveled by light in a year, or 365 days; the speed of light is 3.00 × 108 m/s).
The value in mile is 8.35 * 10^12 miles.
What is conversion?It is often important to be able to convert values from one unit to another. This has always helped to make mathematical and physical computations much easier.
The conversion factor is often used to convert from one unit to another. It serves as bridge that would enable us to be able to convert quantities. The conversion factor has to be dimensionally correct.
Let us now convert 1.42 light-years to miles;
1.42 light years * 3.00 × 108 m/1 s * 1 mi/1609 m * 3600 s/1 hr * 24 hrs/1 day * 365 days/1 year
= 8.35 * 10^12 miles
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What qualities do you think are important for a scientist to have? Give an example of how one of these qualities is shown in your own approach to your schoolwork. Answer in two to three paragraphs. (10 points) Think about what a scientist does in order to obtain reliable information. Do you do any of these things?
Important qualities for scientists to have are curiosity, patience, creativity, persistence, communication, and intelligence.
Hard effort, intelligence, and the ability to effectively manage your time and tasks are, in my opinion, some crucial characteristics for a scientist to possess. Being a scientist will need you to spend a lot of time in a lab or out in nature. It takes skill to meticulously record vital and fascinating information. Additionally, you'll need to be diligent because it's crucial for scientists to put in a lot of effort and produce reliable results.
I believe that hard work is a quality that comes through in my academic performance. I always give my tasks my best effort. I make a consistent effort to get ahead and complete my task on schedule. I have to work less as I work harder. I keep myself busy, which causes me to become less busy.
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Type a response
*REQ
How many protons are in the nucleus of an atom with an atomic number of 15?
Type a response
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Answer:
15
Explanation:
the proton and atomic number are the same hence it remains 15
Pls help.
Carbohydrates are made up of carbon, hydrogen, and another element.
What is that element?
A. helium
B. potassium
C. copper
D. oxygen
The pressure exerted by 0.25mol of carbon monoxide in 10dm3 flask is 120kPa. Calculate the temperature in the flask in kelvin.
The temperature in the flask in kelvin is 577.3 K.
What is the relationship between volume, temperature, moles and pressure of a gas?The relationship between volume, temperature, moles and pressure of a gas is given by the ideal gas equation written below:
PV = nRTwhere;
P is pressureV is volumen is number of moles of the gasR is molar gas constantT is temperatureFor the gas:
P = 120 kPa
n = 0.25 moles
V = 10 dm³
R = R = 8.314 dm³.kPa/mol.K
T = ?
T = PV/nR
T = 120 * 10/8.314 * 0.25
T = 577.3 K
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the energy needed to heat 5.95 g of water from 5.5 ∘C to 64.9 ∘C
The energy needed to heat 5.95 g of water is 1484.406 J.
When work is done and heat and light are produced, energy is the quantitative quality that is transferred to the body or to the physical system.
The water is heated from 5.5° C to 64.9° C.
The mass of the water is 5.95 grams.
The specific heat of water is 4.2 J g⁻¹ C⁻¹ .
Now, the water is heated from:
T₁ = 5.5° C to T₂ = 64.9° C
Therefore, ΔT = T₂ - T₁ = 64.9 - 5.5 = 59.4° C
The heat energy is given as:
Q = m × C × ΔT
Q = (5.95 g ) × ( 4.2 J g⁻¹ C⁻¹ ) × ( 59.4° C )
Q = 1484.406 J
The energy released on heating 5.95 g of water from 5.5° C to 64.9° C is 1484.406 J.
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4. Consider Limitations Students were given the following sets of items and asked, for each set, to identify which item had greater thermal energy. For which set would this task be most difficult? Explain. Set 1: 5 g of iron at 45°C and 10 g of iron at 45 °C Set 2: 10 g of water at 30°C and 10 g of water at 50°℃ Set 3: 32 g of copper at 50°C and 32 g of nickel at 50°C
Set 1 is difficult.
The formula for thermal energy is given as:
Q = mcΔT
Where m is the mass of the item, c is specific heat capacity and ΔT is the change in temperature when the item is heated.
For Set 1:
5 g of iron at 45°C and 10 g of iron at 45 °C
In this case, the mass of iron is different at the same temperature. Since there is no change in temperature hence the metal is not heated. Another reason is that the mass of iron is different in this case. Hence, this set will be difficult to find thermal energy.
Set 2:
10 g of water at 30°C and 10 g of water at 50° C
The mass of water at both temperatures is the same, and the water is heated from 30°C to 50° C The thermal energy can be easily calculated using the formula Q = mcΔT.
Set 3:
2 g of copper at 50°C and 32 g of nickel at 50°C
The mass of copper remains unchanged, also the temperature doesn't change. Since copper is not heated and the temperature remains constant. Hence the thermal energy will be zero.
Therefore, Set 1 will be the most difficult to find the thermal energy.
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The half-life of radioactive chromium-51 is 28 days. If a sample of chromium-51 has a mass of 12.0 μg , calculate the number of days it will take for the mass to be reduced to 3.00 μg .
It takes a total of 56 days for the mass of the chromium-51 to be reduced from 12.0 μg to 3.00 μg.
What is the half life?The half life of a radioactive sample refers to the time taken for only half of the radioactive substance that is originally present to decay. Now we know that radioactivity has to do with the spontaneous disintegration of a substance. This implies that the amount of the substance would continue to decreases as the time goes on.
Having said this, let us consider the question as we have it above. We all know that; the half-life of radioactive chromium-51 is 28 days then the sample of chromium-51 has a mass of 12.0 μg. We are to now obtain the number of days it will take for the mass to be reduced to 3.00 μg .
Hence;
t1/2 = 28 days
N = 3.00 μg
No = 12.0 μg
t = ?
Using;
N/No = (1/2)^t/t1/2
3/12 = (1/2)^t/28
1/4 = (1/2)^t/28
(1/2)^2 = (1/2)^t/28
2 = t/28
t = 56 days
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If the temperature is lowered on a ______________________________, a condensate will be produced.
If the temperature is lowered to a dew point, condensate will be produced.
While the air temperature drops underneath its dew factor, excess moisture can be released in the form of condensation. Condensation problems are maximumly probable to occur in climates in which temperatures regularly dip to 35°F or colder over a prolonged time period.
The dew factor is the temperature to which air needs to be cooled to emerge as saturated with water vapor, assuming steady air stress and water content. while cooled beneath the dew point, moisture potential is reduced and airborne water vapor will condense to form liquid water known as dew. Both the air is cooled to its dew point or it becomes so saturated with water vapor that it can't maintain any extra water. The dew factor is the temperature at which condensation occurs
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I don't know what this is they havent taught it yet or I didnt pay attention
Answer:
2-1
Explanation:
=1
what is the cation and the anion of VCl3?
The cation is [tex]V^3^+[/tex] and the anion is [tex]Cl^-[/tex] in [tex]VCl_3[/tex].
An ionic compound is a chemical compound made up of charged ions called cations and anions that are held together by electrostatic forces.
Cations are elements with one or more positive charges because they have more number of protons than electrons.
Anions are elements with one or more negative charges because they have more number of electrons than protons.
An ion which has lost electrons and now has a positive net charge is said to be a cation. An atom's cation is smaller than the neutral atom because electrons are taken out to produce a cation.
An ion which has acquired electrons and now has a negative net charge is called an anion. The anion of an atom is larger than the neutral atom because electrons have been added to produce it.
In Vanadium (III) chloride, vanadium gives 3 electrons and become +3 charge and chlorine gains 1 electron and become -1 charge. Since 3 electrons are given by vanadium, 3 chlorine atoms are bonded, thus the compound is [tex]VCl_3[/tex].
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A hot air balloon gondola is suspended below a cloth envelope containing 4.213x10^6 Liters of hot air. How many millimeters of hot air is this
The volume of 4.213 x 10⁶ liters of hot air in milliliters is 4.213 x 10⁹ mL of hot air.
What is the volume of the hot air in milliliters?The volume of a substance is the amount of space that substance occupies.
The units for measuring volume of substances includes liters, milliliters, and cm³, dm³.
The milliliter is a smaller unit of the liter.
1 liter = 1000 milliliters
To convert 4.213 x 10⁶ liters of hot air to milliliters, the values is multiplied by 1000.
4.213 x 10⁶ liters of hot air to milliliters = 4.213 x 10⁶ * 1000 mL/L
4.213 x 10⁶ liters of hot air to milliliters = 4.213 x 10⁹ mL of hot air.
In conclusion, to convert volume in liters to milliliters, the value in liters is multiplied by 1000.
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The initial temperature of 100.0 mL of water was 25 oC. The water was then heated to 89 oC. How much heat (in J) was required for this temperature change?
The amount of heat (in J) required for the temperature change is 26752 J.
What is the amount of heat required to raise the temperature of water from 25°C to 89°C?The amount of heat required to raise the temperature of water from 25°C to 89°C is calculated as follows:
Heat required = mass * specific heat capacity * temperature changeMass of water = volume * density
density of water = 1 g/mL
volume of water = 100 mL
mass of water = 100 mL * 1 g/mL
mass of water = 100 g
heat capacity of water = 4.18 J/g°C
Temperature change = 89 - 25 = 64 °C
Heat required = 100 * 4.18 * 64
Heat required = 26752 J
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How many atoms of hydrogen are in 1.255 grams of aluminum hydroxide?
The number of atoms of hydrogen present in 1.255 g of aluminum hydroxide, Al(OH)₃ is 2.89×10²² atoms
How to determine the mole of 1.255 g of Al(OH)₃Mass of Al(OH)₃ = 1.225 gMolar mass of Al(OH)₃ = 27 + 3(16 + 1) = 78 g/molMole of Al(OH)₃ =?Mole = mass / molar mass
Mole of Al(OH)₃ = 1.255 / 78
Mole of Al(OH)₃ = 0.016 mole
How to determine the mole of hydrogen1 mole of Al(OH)₃ contains 3 moles of H.
Therefore,
0.016 mole of Al(OH)₃ will contain = 0.016 × 3 = 0.048 mole of H
How to determine the number of atoms in 0.048 mole of hydrogenFrom Avogadro's hypothesis
1 mole of hydrogen = 6.02×10²³ atoms
Therefore,
0.048 mole of hydrogen = (0.048 mole × 6.02×10²³ atoms) / 1 mole
0.048 mole of hydrogen = 2.89×10²² atoms
Thus, we can conclude that 2.89×10²² atoms of hydrogen are present in 1.255 g of Al(OH)₃
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A child drops a stone into a well. The water
is exactly 20.0 meters below the child's
hand. How long will it take the stone to hit
the water?
Because the stone will accelerate owing to gravity after it is dropped at a rate of 9.8 metres per second squared, you may use physics to compute the depth of the ocean by applying the distance formula: D = v0 t + 1/2 a*t2.
What force is at work when things fall?the gravitational force
In addition, gravity is pulling the thing downward as it falls. Gravity is an imbalanced force at the beginning of a descent. As a result, the thing
The statute addresses the issue of bodies falling. According to the rule of parabolic fall, a falling body's distance travelled is squarely inversely related to the amount of time it takes to descend. As an illustration, a stone that is dropped twice as long as another stone will fall four times as far.
The force of gravity accelerates items as they descend to the ground.
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write a complete ionic equation for the following molecular equation. 2 K3PO4
+ 3 FeBr2
-
6 KBr
+ Fe3(PO4)2
A chemical equation known as an ionic equation expresses the electrolytes in an aqueous solution as dissociated ions. The net ionic equation will be:
3 Fe²⁺(aq)+2PO₄³⁻(aq)⇒Fe₃(PO₄)₂ (s).
What is an Ionic equation?Chemical equations known as ionic equations solely display the ions involved in a chemical reaction. Or, the ions that combine in a solution to react and create new compounds. Those ions that don't take part are referred to as spectator ions.
Ionic equations are used to simplify chemical equations by getting rid of species that aren't changing. This is highly helpful, especially when dealing with redox processes, which are challenging enough without the interference of spectator ions.
According to the question,
PO₄³⁻ phosphate of Na⁺, K⁺, Li⁺, NH₄⁺ group 1 and NH₄⁺ Soluble.
Other than that are insoluble so, Fe₃(PO₄)₂ is soluble.
Molecular equation is :
2k₃PO₄(aq)+3FeBr₂(aq)⇒6 KBr(aq)+Fe₃(PO₄)₂ (s)
So, complete ionic equation will be :
6 K⁺(aq)+2PO₄³⁻(aq)+3Fe²⁺(aq)+6Br⁻(aq)⇒6K⁺(aq)+6Br⁻(aq)+Fe₃(PO₄)₂ (s)
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List the ways in which lightning can be produced.
Brifly explain the chemical reaction and state one example (in word equation). i: Neutralization reaction
Answer:
Neutralization refers to aa chemical reaction where an acid and a base react with each other quantitatively.
Example:
Hydrochloric acid + Sodium hydroxide → Sodium chloride + Water ( word equation)
Explanation:
Though we haven't been asked to write down chemical equation, it is good to know.
Here is the equation:
HCl(aq) + NaOH(aq) → NaCl (aq)+ H2O (l)
How much water is in this cylinder?
Answer:
It's about 13 mL, read it where the lowest point is,
Explanation:
Can I have brainliest? It would help me out, if not thanks anyways! Hope this helped and have a nice day :)
Answer:
About 12.7mL
Explanation:
You always have to count the dip portion of the liquid. It's okay if the number is an estimate. There won't be an exact answer. My chemistry teacher says to not round the answer. Hope this helps!
TRUE or FALSE: As temperature increases, the speed of sound decreases.
Answer:
TRUE
Explanation:
Answer:
True
Explanation:
because high energy molecules carry the sound more quickly
If 0.459 g of an unknown sugar is dissolved in 100.0 mL of water its osmotic pressure is found to be 0.0824 atm.. If the temperature of the solution was 298 K, what is the molar mass of the sugar (in g/mol)? Give your answer to three sig figs
If 0.459 g of an unknown sugar is dissolved in 100.0 mL of water its osmotic pressure is found to be 0.0824 atm. The molar mass of the sugar (in g/mol) is \M = 3.0067.
What is molar mass?"Molar mass of many compounds can be calculated by dividing the mass of the compound by the number of moles of the compound."
Given, that the mass of unknown sugar= 0.459 g
Volume of water = 100.0 mL
Osmotic pressure to be 0.0824 atm
The temperature of the solution = 298 K
Calculating the moles
PV = nRt
R = 8.314, constant
0.0824 X 100.0 = n x 8.314 x 298
8.24 = n x 2477.57
n = 300.67
Now, calculating the molar mass
Molar mass = n / V
300.67 / 100.0
M = 3.0067
Thus, the molar mass of the sugar is 3.0067
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Write the balanced NET ionic equation for the reaction when AICI3 and Na₂S are mixed in aqueous solution. If no reaction occurs, simply write only NR. Be sure to include the proper phases for all species within the reaction.
Answer:
2AlCl3(aq) + 3Na2S(aq) = Al2S3(aq) + 6NaCl(aq)
Explanation:
First, you have to write down a complete equation as shown below:
AlCl3 + Na2S → Al2S3 + NaCl.
When you at the above equation is not balanced.
To balance the equation, we have to identify the number of products and reactants.
Al: 1a + 0b = 2c + 0d, we have 2 Al
Cl: 3a + 0b = 0c + 1d, we have 3Cl
Na: 0a + 2b = 0c + 1d, we have 2Na
S: 0a + 1b = 3c + 0d, we have 3S
Then we simplify to obtain the lowest whole integer value:
a = 2 (AlCl3)
b = 3 (Na2S)
c = 1 (Al2S3)
d = 6 (NaCl)
Substitute the values to our first equation giving us,
2AlCl3 + 3Na2S = Al2S3 + 6NaCl,
We then include the states. Since the reaction is in aqueous solution, we insert (aq)
2AlCl3(aq) + 3Na2S(aq) = Al2S3(aq) + 6NaCl(aq)
Since there is an equal number of each element in the reactants and products of 2AlCl3(aq) + 3Na2S(aq) = Al2S3(aq) + 6NaCl(aq), the equation is balanced.
Thus our required equation is
2AlCl3(aq) + 3Na2S(aq) = Al2S3(aq) + 6NaCl(aq)
HOW DOES WALTER WHITE SLEEP AT NIGHT
Answer:
Since Walter can alter time and space he doesn't have the kind of place to take a nap or buy a cap for his dog zap
Explanation:
Answer:
Breaking Bad
Explanation:
walt
An metal rod weighing 123 g with a temperature of 100.°C is placed in 75 mL of water at 25.0 °C. If the final
temperature of the metal and water is 29.0 °C, what is the specific heat capacity of the metal? (Assume that
the density of water is 1.0 g/mL and specific heat capacity of water is 4.184 J/g°C.)
O 0.23 J/gºC
O 0.14 J/gºC
O 3.6 J/gºC
O 1.6 J/gºC
The specific heat capacity of the metal rod weighing 123g is 0.14 J/gºC (option B).
How to calculate specific heat capacity?The specific heat capacity of a metal substance can be calculated using the following formula:
Q = mc∆T
Where;
Q = heat absorbed or releasedm = mass of substancec = specific heat capacity∆T = change in temperatureHowever, in a calorimeter, the metal and water relationship is given as follows:
Q (water) = - Q (metal)
mc∆T (water) = - mc∆T (metal)
Mass of water = density × volume
Mass of water = 1g/mL × 75mL = 75g
75 × 4.184 × {29°C - 25°C} = - {123 × c × (29 - 100)}
1255.2 = 8733c
c = 1255.2/8733
c = 0.144J/g°C
Therefore, the specific heat capacity of the metal rod weighing 123g is 0.14 J/gºC.
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In a fission reaction, uranium-235 bombarded with a neutron produces
strontium-94, another small nucleus, and three neutrons.
Enter the complete equation for the fission reaction.
Express your answer as a nuclear equation.
In a fission reaction, uranium-235 bombarded with a neutron produce strontium - 94 , another nucleus and three neutrons.the nuclear equation is :
[tex]^{235} U_{92} + ^{1} n_{0} ------ > ^{94} Srx_{38} + ^{139} Xe_{54} + 3^{1} n_{0}[/tex]
uranium-235 bombarded with neutrons produce strontium-94 , another small nucleus and 3 neutrons.
[tex]_{92} U^{235}[/tex] + [tex]^{1} n_{0}[/tex] ------> [tex]^{94} Sr_{38}[/tex] + x + [tex]3^{1} n_{0}[/tex] ( x i unknown nucleus)
in this, the atomic no. and atomic mass in both the side should be same
atomic mass => 235 + 1 = 94 + 3 = 139
atomic no. 92 = 38 => 92 - 38 = 54 ( this is xenon - 139 , the unknown nucleus)
the balance nuclear equation equation is
[tex]^{235} U_{92} + ^{1} n_{0} ------ > ^{94} Srx_{38} + ^{139} Xe_{54} + 3^{1} n_{0}[/tex]
Therefore,In a fission reaction, uranium-235 bombarded with a neutron produce strontium - 94 , another nucleus and three neutrons.the nuclear equation is :
[tex]^{235} U_{92} + ^{1} n_{0} ------ > ^{94} Srx_{38} + ^{139} Xe_{54} + 3^{1} n_{0}[/tex]
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Plutonium-238 undergoes alpha decay as shown:
238 PuX+He
94
Enter the appropriate values for A and Z and the chemical
symbol for X.
A:
Z:
X:
0
Alpha decay of Plutonium-238 into Uranium-234. Therefore, A = 234, Z = 92, X = U
A radioactive process known as "alpha decay" releases a particle made up of two protons and two neutrons when an unstable nucleus transforms to another element. The helium nucleus that is being expelled is known as an alpha particle. Positive charge and a substantial mass characterize alpha particles.
An atomic nucleus emits an alpha particle (the helium nucleus), which causes it to change or "decay" into another atomic nucleus with a mass number that is decreased by four and the atomic number is reduced by two. This process is known as alpha decay or α-decay.
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how many significant figures are in 6.044
Answer: 4
Explanation: There are 4 sig figs because 6 and 4 are always considered significant. And a 0 is considered a sig fig if it's between two numbers besides 0 or if it's after a decimal point.
How do you convert 134 kJ to Cal
PLEASE ANSWER I REALLY NEED IT ITS DUE IN AN HOUR FOR A CROSSWORD
(what) include Filtration,Chromatography, and Distillation.
Filtration simply refers to a method of septation technique which is used to separate insoluble solid from liquid.
For example, the suspension of chalk dust in water can be bestseparated using filtration.
Chromatography is a method of separation technique used to separate the mixture of complex substances such as coloured pigments or components. It can also be used to separate substances which are colourless.Distillation is used to separate mixtures of different miscible liquids.All these explained above are various types of separation techniques in chemistry.
Insoluble solids are solids which cannot dissolve in water.
Miscible liquids are liquid which combine together to form a single liquid.
What is separation technique?Separation technique refers to the process of separating the components of mixtures.
So therefore, filtration simply refers to a method of septation technique which is used to separate insoluble solid from liquid.
Complete question:
Explain what is meant by filtration, chromatography and distillation.
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Name and Title:
Include your name, instructor's name, date, and name of lab.
Objective(s):
In your own words, what was the purpose of this lab?
Hypothesis:
In this section, please include the if/then statements you developed during your lab activity. These statements reflect your predicted outcomes for the experiment.
If predators are increased, then the cricket frog population will (increase/decrease/stay the same) over the span of five years.
If pollution is increased, then the cricket frog population will (increase/decrease/stay the same) over the span of five years.
If the amount of food available is increased, then the cricket frog population will (increase/decrease/stay the same) over the span of five years.
Procedure:
The procedures are listed in your virtual lab. You do not need to repeat them here. Please be sure to identify the test variable (independent variable), outcome variable (dependent variable), and control group for this experiment.
Reminder: The test variable is the item that is changing in this investigation. The outcome variable is the item that you are measuring in this investigation. The control group is the group in the experiment where the factors being tested are not applied. It allows scientists to set a baseline to compare the experimental groups that do have factors applied to them.
Test variable (independent variable):
Outcome variable (dependent variable):
Control group:
Data:
Record your data from each trial in the data chart below:
Type of Factor Beginning Frog Count Simulation 1 (Low) Simulation 2 (High)
Predators (alligators)
Pollution
Food (mosquitoes)
Graphs
Use the graphs you printed from the data chart in the virtual lab and analyze the data. Make a note of any trends that you discover.
Predators (alligators):
Pollution:
Food (mosquitoes):
Conclusion:
Your conclusion will include a summary and an interpretation of the lab results. Please write in complete sentences.
Which limiting factor(s) in this lab simulation are biotic?
Which limiting factor(s) in this lab simulation are abiotic?
Which limiting factor impacted the cricket frog population the most? Use evidence to support your answer.
Which limiting factor impacted the cricket frog population the least? Use evidence to support your answer.
Mosquitoes can carry and transmit disease to animals and humans. Explain how the cricket frog plays an important role in limiting the spread of mosquito-borne illnesses like West Nile virus and malaria.
Predict the long-term effects of these limiting factors on the cricket frog population in the pond ecosystem.
1)The limiting factor in this lab simulation are biotic is Predator and Food.
2)The limiting factor in the lab simulation are abiotic is Pollution.
3)The limiting factor impacted the cricket frog population the most is Predator.
4)The limiting factor impacted the cricket frog population least is pollution.
1)The predator and Food are the biotic limiting factor in this simulation because predator can eat the population of cricket frog and will reduce the population of cricket frog. animals eaten by food is biotic.
2) Pollution in the lab simulation is abiotic factor because it is non living things.
3) The limiting factor impacted the cricket frog population most is predator because for the predator , the cricket frog were the good source of food.
4) Pollution is the limiting factor which affect the cricket frog population because their growth was not much affected by pollution.
5) The cricket frog plays an important role in limiting the spread of mosquito - borne illness like west Nile virus and Malaria because cricket frog consumes mosquitoes and decrease the population of contaminated mosquitoes.
6) The long term effects of these limiting factors on the cricket frog population in the pond eco system is that if the predators increases the population of cricket frog decreases and if the food sources decreases (mosquitoes) then cricket frog die and population decreases and vice - versa.
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