Answers
Answer:
Behavior
Explanation:
Near human habitaciones these toads may congregate underneath outsider lights to feed one the insects the attract.
Related Questions
4 Fe(s) + 3 02(g)
--> 2 Fe₂O3(s)
1. What is the oxidation state of iron (Fe) in the reactant Fe(s)?
2. What is the oxidation state of oxygen (O) in the reactant O2(g)?
3. What is the oxidation state of iron (Fe) in the product Fe2O3(s)?
4. What is the oxidation state of oxygen (O) in the product Fe2O3(s)?
5. In this reaction, iron is... (oxidized or reduced?)
6. In this reaction, oxygen is... (oxidized or reduced?)
7. What was the oxidizing agent in this reaction: Fe(s) or O2(g)?
Answers
The oxidation number of reactant Fe is 0 while the oxidation number of iron in the product is +3
What s a redox reaction?The term redox reaction implies a reaction in which there is an increase in the oxidation number of a specie and the decrease in the oxidation number of another specie.
Now we have the answers as follows;
1) The oxidation number of reactant Fe is 0
2) The oxidation number of reactant oxygen is 0
3) The oxidation number of iron in the product is +3
4) The oxidation number of oxygen in the product is -2
5). Iron is oxidized in the reaction
6) Oxygen is reduced in the reaction
7) The oxidizing agent in this case is the oxygen atom
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Which of the following would be useful for converting g/mol to g/L?
A. Mass percent
B. Avogadro's number
C. Molarity
D. Molar mass
Answers
Answer:
Molarity
Explanation:
The conversion of g/mol to g/L molarity can be used. Thus, option C is correct.
The g/mol has been the amount of solute present in a mole. The g/mol has been the molecular weight of the compound.
The g/L has been the mass of solute present in a L of solution. The g/L has the unit for density.
Molarity has been the moles of solute present in the liter of solution. It has been given as mol/L.
The product of g/mol and g/L gives the value of mol/L. Thus, to convert g/mol to g/L molarity can be used. Thus, option C is correct.
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please help! i will mark as brainliest
The amount of available energy decreases with each step up the energy pyramid. How is this related to the fact that there are so many more producers than consumers on Earth? explain
Answers
Answer:
Most of the food energy that enters a trophic level is "lost" as heat when it is used by organisms to power the normal activities of life. Thus, the higher the trophic level on the pyramid, the lower the amount of available energy.
Explanation:
Classification of matter
Answers
Answer:
The answer is D.
Explanation:
Sweet tea is an homogeneous mixture of sugar and water to a first approx. While the tea is certainly in the same phase (hence homogeneous ), we certainly could separate the sugar from the water by non-chemical means, i.e. by distillation, or evaporation. And thus we classify it as a mixture
Solution Notes
8. Calculate the molarity of 500 ml of 0.0300 moles of NaOH.
Answers
Answer:
\(\huge\boxed{\sf M = 0.06\ M}\)
Explanation:
Given data:No. of moles = n = 0.03 mol
Volume = v = 500 ml = 0.5 L
Required:Molarity = M = ?
Formula:M = n / v
Solution:Put the given data in the above formula.
M = 0.03 / 0.5
M = 0.06 M\(\rule[225]{225}{2}\)
One of the commercial uses of sulfuric acid is in the production of calcium sulfate and phosphoric acid. If 23.7 g of Ca₃(PO₄)₂ reacts with an excess of H₂SO₄, what is the percent yield if 13.4 g of H₃PO₄ are formed in the following UNBALANCED chemical equation
Answers
The percentage yield would be 90.42%
First, the balanced equation of the reaction is as follows:
Ca₃(PO₄)₂ (s) + 3H₂SO₄ (aq) → 2H₃PO₄ (aq) + 3CaSO₄ (aq)
From the equation, the mole ratio of Ca₃(PO₄)₂ and H₃PO₄ is 1:2
Recall that: mole= mass/molar mass
Mole of Ca₃(PO₄)₂ = 23.7/310.174
= 0.076 mole
Mole ratio of Ca₃(PO₄)₂ and H₃PO₄ = 1:2
Mole of H₃PO₄ = 0.076 x 2
= 0.153 mole
Theoretical yield (in g) of H₃PO₄ = mole x molar mass
= 0.153 x 97.994
= 14.82 g
Percentage yield of H₃PO₄ = actual yield/theoretical yield x 100
= 13.4/14.82 x 100
= 90.42%
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In a closed system, If a gas is transported to a container with double the volume of the previous container, the gas was held in, what is the gases' new volume?
The volume of the gas is fixed and will not change.
The volume of the gas will be half the original volume.
The volume of the gas will be the original volume squared.
The volume of the gas will be double the original volume.
Answers
Answer:
The volume of the gas is fixed and will not change.
Explanation:
The volume of the gas will not change because there is no change in temperature. Temperature increases the volume of gases enclosed in a container.
Determine the molecular formula and molecular mass of the compound represented by the chemical structure. Round your answer for the molecular mass to the hundredths place. Lines represent bonds between adjacent atoms.
Answers
Answer:
Molecular formula of the compound- C5H10O6
Molecular mass of the compound = 166.127 g
Explanation:
The molecule is a sugar with molecular formula C5H10O6. Now, we have to note the relative atomic masses of the elements in order to calculate the molecular mass of the compound to the hundredth place.
Carbon= 12.011, Hydrogen= 1.00784, Oxygen= 15.999
Hence , molecular mass = 5(12.011) + 10(1.00784) + 6(15.999)
Molecular mass = 60.055 + 10.0784 + 95.994
Molecular mass= 166.127 g
Answer:
The molecular formula = C5 H10 O5
Molecular mass = 150
Explanation:
C = 12.011
C X 5 = 60.055
H - 1.0079
H X 10 = 10.079
O = 15.999
O X 5 = 79.995
60.055 + 10.079 + 79.995 = 150.13
What is the percent of C in Ca(C2H3O2)2?
(Ca = 40.08 g/mol, C = 12.01 g/mol, H= 1.01 g/mol, O= 16.00 g/mol)
[?]% C
Answers
The percent by mass of the carbon is 30.4%.
What is the percentage of calcium?The term percentage has to do with the ratio of the mass of a particular atom to the total mass of the compound multiplied by one hundred. Thus the first step is to find the total mass or the molar mass of the compound.
Molar mass = 40 + 2(2(12) + 3(1) + 2(16))
= 40 + 2(24 + 3 + 32)
= 40 + 2(59)
= 40 +118
= 158
Thus the mass of carbon is;
4(12)/158 * 100/1
= 30.4%
Thus carbon is only about 30.4% by mass of the compound.
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Please help ASAP!
John pushes his bed TO THE RIGHT, overcoming the force of friction. On the free-body diagram below, which force represents the friction force on the bed?
Answers
The frictional force that acts on the body is shown as force D.
What is the force of friction?We know that the term friction has to do with the force that opposes the motion of a body along a surface. The magnitude of the frictional force is highly dependent on the nature of the surfaces that are in contact with each other.
In this case we have a free body diagram. The meaning of the Freebody diagram is a diagram that show all the forces that acts on a body. In this case, we can see that there are four forces that act on the body and they are the frictionl force, the moving force, the weight of the object and the normal reaction on the objject.
We can see that all the forces that are acting on the body have been labelled with a proper alphabet.
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what would lead to a higher final temperature of water, a metal with a low heat capacity of a high heat capacity
Answers
A hot metal with a low heat capacity will raise the final temperature of water more than a hot metal with high heat capacity.
Heat capacityIt is the amount of heat required to change the temperature of a substance by just a unit.
Substances that heat up quickly are said to have low heat capacities while those that take time to heat up are said to have high heat capacities.
Substances with low heat capacity also release their thermal energy quicker than those with high heat capacity.
Thus, a hot metal with low heat capacity will readily transfer its thermal energy to water than a hot metal with high heat capacity.
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PLEASE BROO if the controlled substances, which schedule of drugs is the average person most likely to have in their homes? How are the controlled substances in this group different from those in the other schedule levels?
Answers
Answer:
The average person is most likely to have Schedule V controlled substances in their homes. These drugs have a low potential for abuse and limited dependence liability compared to other schedule levels. They are often used for medical purposes and include cough syrups containing codeine, anti-diarrhea medications, and some prescription pain medications.
The drugs in other schedule levels, such as Schedule I, II, III, and IV, have a higher potential for abuse and dependence and are considered to be more dangerous and addictive. These schedules include drugs such as cocaine, methamphetamine, fentanyl, and other highly regulated substances.
Explanation:
A mixture of 14.0 grams of hydrogen, 84.0 grams of nitrogen, and 2.0 moles of oxygen are placed in a flask. When the partial pressure of the oxygen is 78.00 mm of mercury, what is the total pressure in the flask?
Answers
Total pressure in the flask : 468 mmHg
Further explanationDalton's law of partial pressures states that the total pressure of a mixture of gases is equal to the sum of the partial pressures of the component gases
Can be formulated:
P tot = P1 + P2 + P3 ....
The partial pressure is the pressure of each gas in a mixture
For partial gas :
Pgas₁=x₁.P tot
x₁ = mole fraction of gas 1
mol of each gas :
H₂ = 14 g : 2 g/mol= 7 moles
N₂ = 84 g : 28 g/mol = 3 moles
O₂ = 2 moles
Total moles = 7+3+2= 12 moles
Partial pressure of O₂ :
\(\tt P_{O_2}=x_{0_2}\times P_{tot}\\\\78~mmHg=\dfrac{2}{12}\times P_{tot}\\\\P_{tot}=\dfrac{78\times 12}{2}=468~mmHg\)
The study of chemicals is called chemistry.
The correct answer is 468mmhg.
Dalton's law defined as partial pressures states that the total pressure of a mixture of gases is equal to the sum of the partial pressures of the component gases
The formula is stated as follows:-
\(P_{total} = P_1 + P_2 + P_3...\)
The partial pressure is the pressure of each gas in a mixture. For partial gas is as follows :
\(P_{gas}_1=X_1.P_{total}\)
The \(X_1\) defined as a mole fraction of gas 1
The mole of each gas is as follows:-
\(H_2 = \frac{14}{2}= 7 molesN_2 = \frac{84}{28} = 3 molesO-_2 = 2 moles\)
Total moles = \(7+3+2= 12 moles\)
The partial pressure \(O_2\) is as follows:-
\(P_{total} = \frac{78*12}{2} =468mm\).
Hence, the correct answer is 468mmhg.
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If one photon of radiant energy supplies 3.37 × 10−19 J, then how many photons will one mole supply
Answers
One mole of radiant energy will supply 6.02 x 10^23 photons.
How can the number of photons be determined from photon energy?
The number of photons is calculated by dividing the overall energy of a pulse by the energy of one photon included inside the pulse.
One photon: What does that mean?As a result, an electromagnetic energy particle is known as a photon. Photons have no mass, thus they move at the same rate as light.
we need to first calculate the total energy in one mole of photons,
By combining the energy per photon with Avogadro's number (6.022 x 1023), one may determine the energy of a mole of photons:
Energy per mole of photons = Energy per photon x Avogadro's number
we can calculate the energy per mole of photons:
Energy per mole of photons = 3.37 × 10−19 J x 6.022 x 10^23
Energy per mole of photons = 2.03 x 10^5 J/mol
Number of photons in one mole = Energy per mole of photons / Energy per photon
Number of photons in one mole = 2.03 x 10^5 J/mol / 3.37 × 10−19 J
Number of photons in one mole = 6.02 x 10^23 photons/mol
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Which type of molecule is acetone?
A. Amine
B. Ketone
C. Alcohol
D. Aldehyde
Answers
Answer: B. Ketone
Explanation: Another name for acetone is propanone, and it is the main ketone as it has the functional group in the middle, a CH3 on each side. Ketones have the C=O functional group.
can someone explain how to do T-Test and Q-Test
Answers
In order to determine whether there is a significant difference between two samples, the Student's t-test examines their mean and standard deviation.
For beginners, how do you interpret t-test results?A significant t-score, also known as a t-value, denotes a difference between the groups, whereas a small t-score denotes similarity. Degrees of freedom are the values in a research that have the flexibility to change, and they are crucial for determining the significance and reliability of the null hypothesis.
This test is used when specimens from two distinct populations, species, or groupings are compared and analyzed. The independent T-test is another name for it.
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C6H12O6 + 602 → 6CO2 + 6H₂O
The most efficient ratio is
1 C6H12O6 6 02.
Which set of reactants will be the most
efficient (least wasteful of materials) for
the reaction?
A. 1.0 mol C6H12O6 and 3.0 mol O₂
B. 1.5 mol C6H₁2O6 and 3.0 mol O₂
C. 3.0 mol C6H₁2O6 and 6.0 mol O₂
D. 0.5 mol C6H₁2O6 and 3.0 mol O₂
Answers
Answer:
D
Explanation:
The ratio of C6H12O6 (which will be referred to as "the carb") to oxygen is 1 to 6, so if we find an answer which has the same ratio, it should be chosen. A is 1:3
B is even worse with a ratio of the carb to oxygen of 1:2
C is the same as B, 1:2
D has a ratio of the carb to oxygen of 1:6, which is what we are looking for.
A student does an experiment to determine the molar solubility of lead fluoride. He constructs a voltaic cell at 298 K consisting of a 0.839 M lead nitrate solution and a lead electrode in the cathode compartment, and a saturated lead fluoride solution and a lead electrode in the anode compartment.
If the cell potential is measured to be 7.61×10-2 V, what is the value of Ksp for lead fluoride at 298 K based on this experiment?
Answers
PbF2(s) ⇌ Pb2+(aq) + 2F-(aq)
The solubility product expression for lead fluoride is:
Ksp = [Pb2+][F-]^2
At equilibrium, the cell potential (Ecell) is related to the Gibbs free energy change (ΔG) by the equation:
ΔG = -nFEcell
where n is the number of moles of electrons transferred in the cell reaction, and F is the Faraday constant (96,485 C/mol).
In this case, the cell reaction is:
Pb(s) + PbF2(s) ⇌ 2Pb2+(aq) + 2F-(aq)
Two moles of electrons are transferred, so n = 2.
The free energy change can be related to the equilibrium constant (K) by the equation:
ΔG = -RT ln(K)
where R is the gas constant (8.314 J/K·mol), and T is the temperature in Kelvin.
We can combine these equations to obtain an expression for Ksp:
Ksp = e^(-ΔG/RT) = e^(nFEcell/RT)
Substituting the given values:
n = 2
F = 96,485 C/mol
Ecell = 7.61×10^-2 V
R = 8.314 J/K·mol
T = 298 K
Ksp = e^(2 * 96,485 C/mol * 7.61×10^-2 V / (8.314 J/K·mol * 298 K))
Ksp = 3.01×10^-8
Therefore, the value of Ksp for lead fluoride at 298 K based on this experiment is 3.01×10^-8.
HELP NO LINKS!!
The number in the box is _____ and this is a form of ______ decay.
Answers
The number in the box is 225 and this is a form of beta decay.
What is a beta decay?Beta decay is a nuclear reaction in which a beta particle (electron or positron) is emitted. A beta particle is an energetic electron or positron produced as the result of a nuclear reaction or nuclear decay.
A radioactive decay is any of several processes by which unstable nuclei emit subatomic particles and/or ionizing radiation and disintegrate into one or more smaller nuclei.
According to this question, a radium atom undergoes a beta decay. Since a beta particle has 0 as mass number and -1 as atomic number, this means that the mass number of the resulting product will be unchanged.
Therefore, the mass number of the product will be 225.
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mass of 1×10^25 molecules of water
Answers
Answer:
1.E25 it is the answer the answer to mass of 1×10^25 molecules of water
Explanation:
this is just EXPLINATION find your answer using this
first divide the number of molecules by Avogadro's number 6.022*10^25
you will
l get no. of Moles of water
multiply the no. of Moles with mass of 1 Mole of water 18g per mole
if get answer you comment
you should try on your own you will understand better
While isobaric heat can be measured by using the coffee cup calorimeter, what kind of device would be needed to measure the reaction heat under isochoric condition? Please search literature to answer the question.
To measure the reaction heat more accurately at isobaric condition, what modification(s) would you suggest making on the coffee cup calorimeter? Please justify the suggested change(s).
Answers
To measure reaction heat under isochoric conditions, a bomb calorimeter is needed.
This device is designed to maintain a constant volume (isochoric) during the reaction, allowing for accurate measurement of reaction heat. To improve the accuracy of the coffee cup calorimeter for measuring reaction heat under isobaric conditions, a modification that could be made is to use a stirring device to ensure uniform mixing of the reactants and to minimize heat loss to the surroundings.
Additionally, a lid with a small hole could be placed over the top of the calorimeter to prevent heat loss while still allowing for pressure equalization. These modifications would help to minimize errors in heat measurement and improve the accuracy of the results obtained.
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When you see or visit grasslands, what do you know about the climate? (Select all that apply.)
They have a lot of precipitation.
They have mild to hot summers.
They have little precipitation.
They have cold winters.
Answers
When you see or visit grasslands you know that :
They have mild to hot summers ( B )They have a lot of precipitation ( A )Grassland vegetationGrasslands are a type of vegetation found mostly in areas with favourable weather conditions such as mild summers and right amount of precipitation which provides the grasslands with enough water for proper growth.
Other types of vegetation include :
Forest vegetationTundra and Desert vegetationDesert vegetation expreciences very hot summers and little precipitation which leads to the scarcity of green vegetation, while forest vegetation expreciences a very high level of precipitation.
Hence we can conclude that When you see or visit grasslands you know that :They have mild to hot summers ,They have a lot of precipitation
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Answer:
They have little precipitation.
They have cold winters.
They have mild to hot summers.
When an object radiates heat, the strength of this radiation far from the object decreases when distance from the source increases as shown in the graph below:
That is, radiated heat is much stronger near its source.
The universe is full of heat that was radiated by a source that no longer exists. This heat is known as cosmic background radiation. Cosmic background radiation is not stronger in any one direction or part of the universe than in others.
The following image is a map of the cosmic background radiation. Red areas are only 0.0002 K hotter than the blue areas. The overall temperature of the radiation is 2.725 K.
Image by the WMAP team, courtesy of the Legacy Archive
for Microwave Background Data Analysis (LAMBDA) supported by NASA
What does the uniformity of this radiation imply about its source?
A.
The source of cosmic background radiation filled the entire universe.
B.
The source of cosmic background radiation moved randomly.
C.
The source of cosmic background radiation existed for a very short time.
D.
The source of cosmic background radiation existed for a very long time.
Answers
The uniformity of the cosmic background radiation implies that the source of the radiation filled the entire universe.
What is radiation?Radiation refers to the emission of energy in the form of waves or particles through space or a material medium. This energy can be in the form of electromagnetic waves, such as visible light, radio waves, and X-rays, or it can be in the form of particles, such as alpha and beta particles, neutrons, and protons. Radiation can be natural, such as from the sun, or it can be man-made, such as from nuclear power plants and X-ray machines. Radiation can have both beneficial and harmful effects, depending on the amount and type of radiation and the way it is used or encountered.
Here,
This is because the radiation is not stronger in any one direction or part of the universe than in others, indicating that the source was uniformly distributed throughout space. If the source had moved randomly or existed for a very short or very long time, it would not be expected to produce such a uniform distribution of radiation.
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1. Ionic compounds and polar molecules can both dissolve in water. Which statement correctly describes what will occur when they dissolve?
ONeither the ionic compound nor the polar molecule will dissociate in water.
O Both the ionic compound and the polar molecule will dissociate in water.
The ionic compound will dissociate, but the polar molecule will not.
The polar molecule will dissociate, but the ionic compound will not.
Answers
Answer: C. Both will dissociate.
Explanation: Polar molecules dissociate in water because they can hydrogen bond. This allows them to hydrogen bond with other water molecules which are also Polar. In general, Polar molecules dissolve in other polar solutions.
Ionic compounds dissolve in water because they can form Ion-Dipole interactions. The cation of the Ionic compound attracts the negative part of the water molecule while the anion attracts the positive part of the water molecule.
A solution has a [H3O+] of 1 × 10−5 M. What is the [OH−] of the solution?
A) 9 M
B) 14 M
C) 1 x 10^{-9}
D) 1 x 10^{-14}
Answers
How does pollution affect Earth Systems.
ILL GIVE BRAINLIEST!!!!!!
Answers
Answer:
pollution causes smog
Smoke fog, or smog for short, is a type of intense air pollution.
it makes GHG wich is greenhouse gas and it makes the smog to stay inside the earth wich heats the Earth and it causes flood, storm, tornadoes, ect.
Determine the volume occupied by 10 mol of helium at
27 ° C and 82 atm
Answers
Answer:
3.00 L
Explanation:
PV = nRT
(82 atm × 101325 Pa/atm) V = (10 mol) (8.314 J/mol/K) (27 + 273) K
V = 0.00300 m³
V = 3.00 L
On the summit of Mt. Everest, the atmospheric pressure is 210.
mmHg and the air density is 0.429 g/L. Assume that the molar
mass of air is 29.0 g/mol. Calculate the temperature (in °C) at
the summit. °C
Answers
The temperature (in °C) at the summit is mathematically given as
T=229.0C
Temperature at the summit.Question Parameters:
the atmospheric pressure is 210.
mmHg and the air density is 0.429 g/L
the molar mass of air is 29.0 g/mol
Generally the equation for the Temperature is mathematically given as
\(T=\frac{PV}{nR}\)
Therefore
T=\frac{0.27*1.0}{0.01468*0.821}
T=229.0C
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A group of scientists must complete a study, but they have
limited funding from a government organization. Name
two ways these scientists can work around this limitation.
Answers
The scientific community may act somewhat on restricted government financing circumstances throughout two ways:
Source for further money.Adjust this same scale and complexity of the investigation.
Source for further money:
A researcher anyone who has restricted equipment and materials to finish an investigation might cooperate with certain other scientists as well as establish networking to exchange resources, thoughts, and behaviors for the survey's completion.Adjust this same scale and complexity of the investigation:
To decrease costs, the researchers might measure the study up by decreasing the levels initially intended for the investigation.
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Answer:
Explanation:
One solution is to limit the scope of the study. Another possibility is do several smaller studies over a longer period of time.
A geochemist in the field takes a 34.0 mL sample of water from a rock pool lined with crystals of a certain mineral compound X. He notes the temperature of the pool, 22.0 °C, and caps the sample carefully. Back in the lab, the geochemist first dilutes the sample with distilled water to 750.0 mL. Then he filters it and evaporates all the water under vacuum. Crystals of X are left behind. The researcher washes, dries, and weighs the crystals. They weigh 0.31 g.
Using only the information above, can you calculate yes the solubility of X in the water at 17.0 °C? If yes, calculate it. Be sure your answer has a unit symbol and 3 significant digits.
Answers
Answer:
The solubility is \(S = 0.00912 \ g/mL\)
Explanation:
From the question we are told that
The original volume of sample is \(V_o = 34.0 mL = 34 *10^{-3} \ L\)
The temperature is \(T = 22.0 ^oC\)
The new volume of sample is \(V_n = 750.0 mL = 750 *10^{-3} \ L\)
The weight of the crystal is \(X = 0.31 \ g = 0.31 *10^{-3} \ kg\)
Now looking at the question we see that 34.0 mL of the sample is saturated with 0.31g of the crystal X
Generally the solubility of X in the water sample at \(22.0 ^oC\) can be mathematically evaluate as
\(S = \frac{0.31 }{34.0}\)
\(S = 0.00912 \ g/mL\)