A chemical company accidentally released 275 L of a 1.50 M solution of a toxic pesticide into a nearby stream. The stream flows directly into a pond.
'The safe concentration of the pesticide is 1.20 x 10 mol/L. If the pond contains 375 kL of water, would the pond remain under the safe
concentration of the pesticide?
Answers
The pond would remain within the safe amount of the pesticide.
What is concentration?We define the term concentration as the amount of a substance that can be found in the system. We know hat the concentration of a solute is what is going to tell us how safe a place is since there is often a threshold of the safety for each of the pollutants that are in the system based on the amount of the concentration of the species that are present in the system.
Amount of substances is given by; Concentration * volume of the solution
The amount of the pollutant that has been released by the company can be obtained as; 275 L * 1.50 M = 412.5 moles.
The amount of the substance in the safe pond is obtained from;
1.20 x 10^-3 mol/L * 375 * 10^3 L
= 450 moles
We can see that the number of moles of the pollutants released in the water is yet to reach the threshold.
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Related Questions
Which element is a metal?
A. Ba
B. I
C. O
D. S
Answers
Answer:
A
Explanation:
hope this helps :)
Please help with these two (last question is nwse)
Answers
Answer:
your answer gonna be 20 miles
what is an Atom in
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in 2 hours a bicyclist traveled 75 kilometers. What was the bicyclist's average speed?
Answers
Answer:
37.5 miles per hour....
how does a fire blanket work?
Answers
Answer:
Fire blanket work by placing them on the ground and wrapping them in the blanket, oxygen is excluded, and the flames diminished.
how many peaks would be expected in your aldol product molecule if a 13 c nmr spectrum were taken? (2 pt
Answers
The number of peaks that would be expected in your aldol product molecule if a 13 c nmr spectrum were taken is 8.
What is Dibenzyl acetone?Dibenzyl acetone is an organic compound with the chemical formula C₂0H₂O. It is also known as 4,4'-dibenzylideneacetone or DBA. It is a yellow to brown colored solid and is insoluble in water but soluble in organic solvents such as ethanol and acetone.
Dibenzyl acetone is widely used in organic synthesis as a building block for the preparation of various organic compounds. It is used as a starting material in the synthesis of chiral ligands, pharmaceuticals, and agrochemicals. It is also used as a flavor and fragrance ingredient in the production of perfumes and cosmetics.
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How many peaks would be expected in your aldol product molecule if a 13C NMR spectrum were taken?
aldol product is dibenzyl acetone
arrange the following in order of increasing radius: o2-, f- , ne ,rb ,br-
Answers
The radius of an atom of a chemical element is a measure of the atom's size. The meaning of it is said to be the typical distance, which is from the center of the nucleus to the boundary of the atom, which is surrounding the electrons.
Explanation :
To arrange the following in order of increasing radius: O2-, F-, Ne, Rb, and Br-, follow these steps:
1. Determine the number of protons and electrons for each species.
2. Compare their positions on the periodic table.
Here's a breakdown of the species with their protons and electrons:
- O2-: 8 protons, 10 electrons
- F-: 9 protons, 10 electrons
- Ne: 10 protons, 10 electrons
- Rb: 37 protons, 37 electrons
- Br-: 35 protons, 36 electrons
Now, let's compare their positions on the periodic table:
- O2-, F-, and Ne are all in the same period (row), so we'll compare their atomic numbers (protons) to determine their size. As we move across a period from left to right, the atomic radius decreases, so the order will be O2- > F- > Ne.
- Rb and Br- are in the same group (column). Going down a group, the atomic radius increases, so Rb > Br-.
Finally, we can combine these orders to get the overall order of increasing radius: O2- < F- < Ne < Br- < Rb.
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12) Balance the following chemical equation:
Zn +
H3PO4
Zn3(PO4)2 +
H2
Answers
Answer:
Sorry I am not very good at chemistry.
Explanation:
Diamonds are one of the hardest materials known. Hardness is how resistant a material
is to being scratched by another material. If two samples of metal that appear identical
are scratched by a diamond, is that sufficient to determine that they are the same metal?
Why or why not?
Answers
An ion has 56 protons, 54 electrons, and 81 neutrons. What is its atomic #?
Answers
Answer:
110.91982
The element is probably Barium
The atomic number of an atom is equal to the number of protons it has. In this case, the ion has 56 protons. Therefore, the atomic number of the ion is 56.
The atomic number or nuclear charge number (symbol Z) of a chemical element is the charge number of an atomic nucleus. For ordinary nuclei composed of protons and neutrons, this is equal to the proton number (np) or the number of protons found in the nucleus of every atom of that element. The atomic number can be used to uniquely identify ordinary chemical elements. In an ordinary uncharged atom, the atomic number is also equal to the number of electrons.
For an ordinary atom which contains protons, neutrons and electrons, the sum of the atomic number Z and the neutron number N gives the atom's atomic mass number A. As there are 56 protons thus the atomic number of the ion is 56.
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Calculate the ΔGr0 of the following reaction and state whether it is spontaneous at standard temperature or not. (You will need Table B-12 in your CRG.)
2HCl(aq) + Ca(OH)₂(s) CaCl₂(s) +2H₂O(1)
O 6.5 kJ, yes
O 61.5 kJ, no
O 61.5 kJ, no
O 6.5 kJ, no
O-61.5 kJ, yes
-
Answers
Explanation:
The ΔG° of a reaction can be calculated using the formula:
ΔG° = ΔH° - TΔS°
where ΔH° is the standard enthalpy change, ΔS° is the standard entropy change, and T is the absolute temperature in Kelvin.
From Table B-12 in the CRG, we have:
ΔH° = -65.2 kJ/mol for the reaction
ΔS° = -111.7 J/(mol*K) for the reaction
We need to convert ΔS° to kJ/(molK):
ΔS° = -111.7 J/(molK) × (1 kJ/1000 J) = -0.1117 kJ/(mol*K)
Now we can calculate ΔG°:
ΔG° = ΔH° - TΔS°
ΔG° = -65.2 kJ/mol - (298 K) × (-0.1117 kJ/(mol*K))
ΔG° = -65.2 kJ/mol + 33.4 kJ/mol
ΔG° = -31.8 kJ/mol
The negative value of ΔG° indicates that the reaction is spontaneous at standard temperature. Therefore, the answer is: 6.5 kJ, yes. However, this is not one of the options provided.
How does the Periodic Table work and what is it? What are periods and groups?
Answers
Answer:
The columns of the periodic table are called groups. Members of the same group in the table have the same number of electrons in the outermost shells of their atoms and form bonds of the same type. The horizontal rows are called periods.
Convert 25 gigaseconds into centiseconds
Answers
25 gigaseconds is equal to 2,500,000,000,000 centiseconds
A sample of gas has a volume of 2.00L at 25.0 degrees Celcius and 1.08atm. What volume ( in liters) will it have at 100 degrees Celcius and 1.5atm?
Answers
Answer:
Explanation:
The question requires us to calculate the volume (in L) of a gas under the conditions given.
The following information was provided by the question:
Initial volume of gas = V1 = 2.00 L
Initial temperature of gas = T1 = 25.0 °C
Initial pressure of gas = P1 = 1.08 atm
Final temperature of gas = T2 = 100 °C
Final pressure of gas = P2 = 1.50 atm
To solve this problem, we'll need to apply the equation of ideal gases (shown below) twice: first, to determine the number of moles of gas, and again to calculate the volume of gas under the final conditions. Note that we'll determine the number of moles of gas under the initial conditions because this amount won't change (as we're talking about the same sample of gas).
\(undefined\)Diffusion in Solids It is desired to calculate the rate of diffusion of CO₂ gas in air through a loosely packed bed of sand at 276K and a total pressure of 1 atm. The bed depth is 1.25 m and the void fraction e is 0.3. The partial pressure of CO₂ at the top of the bed is 2.026 x 10' Pa and 0 Pa at the bottom. Assume equimolar counterdiffusion of CO₂ and air. Use a t of 1.87. DAB-0.142×10 m²/s.
Answers
the rate of diffusion of CO₂ gas in air through the bed of sand is approximately 2.304 × 10^-6 mol/(m²·s).
To calculate the rate of diffusion of CO₂ gas in air through a bed of sand, we can use Fick's law of diffusion:
J = -DAB (dC/dx)
where J is the molar flux of CO₂, DAB is the diffusion coefficient of CO₂ in air, and (dC/dx) is the concentration gradient of CO₂ in the direction of diffusion.
To calculate the concentration gradient, we can use the following equation:
(dC/dx) = (ΔC/Δx)
where ΔC is the difference in partial pressure of CO₂ between the top and bottom of the bed, and Δx is the bed depth.
We are given that the bed depth is 1.25 m and the void fraction is 0.3, which means that the volume of the bed is:
V = (1 - e) A L
where A is the cross-sectional area of the bed and L is the bed depth. Assuming a circular cross-section, we can calculate the area as:
A = π (d/2)²
where d is the diameter of the bed. We are not given the diameter, so we cannot calculate the area.
However, we are given the partial pressure of CO₂ at the top and bottom of the bed, as well as the diffusion coefficient and temperature. We can use these values to calculate the molar flux of CO₂ using Fick's law of diffusion.
First, we need to convert the diffusion coefficient to the appropriate units:
DAB = 0.142 × 10^-9 m²/s
Next, we can calculate the concentration gradient:
ΔC = 2.026 × 10^4 Pa - 0 Pa = 2.026 × 10^4 Pa
Δx = 1.25 m
(dC/dx) = (ΔC/Δx) = (2.026 × 10^4 Pa/1.25 m) = 1.6208 × 10^4 Pa/m
Finally, we can calculate the molar flux of CO₂:
J = -DAB (dC/dx) = -(0.142 × 10^-9 m²/s) (1.6208 × 10^4 Pa/m) = -2.304 × 10^-6 mol/(m²·s)
The negative sign indicates that the molar flux of CO₂ is in the opposite direction of the concentration gradient, which is expected for equimolar counterdiffusion.
Therefore, the rate of diffusion of CO₂ gas in air through the bed of sand is approximately 2.304 × 10^-6 mol/(m²·s).
Carbon disulfide gas and oxygen gas react to form sulfur dioxide gas and carbon dioxide gas. What volume of carbon dioxide would be produced by this reactionif 1.1 L of carbon disulfide were consumed?Also, be sure your answer has a unit symbol, and is rounded to 2 significant digits.08 0 0.20.0X
Answers
Answer: Based on the stoichiometry 1 mole of carbon disulfide will produce 1 mole of carbon dioxide. Similarly we can apply the volume ratio, so 1.1L of carbon disulfide will produce 1.1L of carbon dioxide.
as gold changes from a liquid with a temperature of 1070 c to a solid with temperature of 25 c what happens to the density
Answers
In this case the temperature of gold is decreased from 107 C to 25 C , so, the density gets increased.
The temperature decreases as density rises. Temperature rises as density decreases. Density decreases as temperature rises higher. The density of an item and its temperature are found to be proportional. This relationship means that variations in the ambient temperature have an effect on an object's density. The relationship between a high temperature and an object's lesser density is direct. As the temperature drops, it is also seen that an object's or a solution's volume reduces.
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how much energy should be transferred when 18.2 g of ammonia is formed during the reaction of hydrogen gas with nitrogen gas? add the energy term to the correct side of the equation.
Answers
The formation of 18.2 g of ammonia (NH3) from the reaction of hydrogen gas (H2) with nitrogen gas (N2) involves the release or absorption of energy.
To determine the amount of energy transferred, we need the enthalpy change per mole of ammonia formed, which is typically expressed as ΔHf (the enthalpy of formation). The balanced equation for the reaction is:
N2(g) + 3H2(g) → 2NH3(g)
The energy term should be added to the correct side of the equation based on whether the reaction is exothermic (energy released) or endothermic (energy absorbed). Without the specific value for the enthalpy of formation (ΔHf) of ammonia, we cannot calculate the exact amount of energy transferred.
In the reaction, if the enthalpy change (ΔH) is negative (exothermic), it means energy is released during the formation of ammonia. If ΔH is positive (endothermic), it means energy is absorbed. To determine the energy transferred, we would multiply the amount of ammonia formed (18.2 g) by the enthalpy change per mole (ΔHf) of ammonia.
In summary, to calculate the amount of energy transferred during the formation of 18.2 g of ammonia, we need the specific enthalpy of formation (ΔHf) of ammonia, which is not provided. The energy term should be added to the correct side of the equation based on whether the reaction is exothermic or endothermic.
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Determine whether the study is experiment or an observational study, and then identify a major problem with the study. a) The Physicians Health Study involved 22,071 male physicians. Based on random selections, 11,037 of them were treated with aspirin and the other 11,034 were given placebos. The study was stopped early because it became clear that the aspirin reduced the risk of hear attack by a substantial amount. b) A medical researcher tested for a difference in systolic blood pressure levels between male and female students who are 12 years of age. She randomly selected four males and four females for her study.
Answers
a) The study is an experimental study.
A major problem with the study is the lack of blinding.
b) The study is an observational study.
A major problem with the study is the small sample size.
a) The Physicians Health Study is an experiment because the researchers intentionally assigned participants to two groups: one receiving aspirin and the other receiving placebos.
A major problem with the study is the lack of blinding. Since the participants were aware of whether they were receiving aspirin or placebos, their knowledge could have influenced their behavior and responses, potentially introducing bias. Additionally, the study involved only male physicians, so the results may not be generalizable to other populations or genders.
b) The study described is an observational study because the researcher did not intervene or assign treatments. Instead, the researcher observed and compared existing differences in systolic blood pressure levels between male and female students.
A major problem with the study is the small sample size. With only four males and four females, the sample may not be representative of the larger population, limiting the generalizability of the findings. Additionally, the study did not specify any control or comparison group, making it challenging to draw definitive conclusions about the differences in blood pressure between genders.
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what separation procedure is most likely to happen? .a. freezing a compound will break it down into elements .b. filtering a mixture will separate it into mixtures .c. boiling a pure substance will separate it into mixtures .d. melting an element will break it down into compounds?
Answers
Explanation:
i think its B but i'm not fully sure (Correct)
Answer:
B.
Explanation:
What is the coefficient for water molecules in the balanced version of the following redox reaction? cr2o2−7 c2h4o→c2h4o2 cr3
Answers
The given redox reaction is:
Cr2O7^2- + C2H4O → C2H4O2 + Cr3+
To balance this reaction, we first balance the oxygen atoms by adding H2O on the right side of the equation. The number of H2O molecules added depends on the number of oxygen atoms needed. In this case, we need three O atoms on the right side, so we add three H2O molecules to the right side of the equation:
Cr2O7^2- + C2H4O → C2H4O2 + Cr3+ + 3H2O
Next, we balance the hydrogen atoms by adding H+ ions on the left side of the equation. The number of H+ ions added depends on the number of hydrogen atoms needed. In this case, we need eight H atoms on the left side, so we add eight H+ ions to the left side of the equation:
Cr2O7^2- + C2H4O + 8H+ → C2H4O2 + Cr3+ + 3H2O
Finally, we balance the charge by adding electrons. The number of electrons added depends on the difference in charge on the left and right side of the equation. In this case, the left side has a charge of -2 (from the Cr2O7^2- ion), while the right side has a charge of +3 (from the Cr3+ ion). This means that we need to add 5 electrons to the left side of the equation to balance the charge:
Cr2O7^2- + C2H4O + 8H+ + 5e- → C2H4O2 + Cr3+ + 3H2O
Therefore, the coefficient for water molecules in the balanced version of the given redox reaction is 3.
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WILL GIVE BRAINLIEST
Which statement describes earthquakes?
They release energy.
They are caused by reduced stress in rocks.
They begin at the epicenter.
They result from movement on Earth’s surface.
Answers
Answer:
A
Explanation:
The above map shows the route of a car traveling from home to the
park. If the car is traveling at a constant speed, does the car
accelerate at any point on the route? Yes or No, and explain your
reasoning.
Answers
Answer:
Yes there is turns and strait points
Explanation:
How many different elements are involved in the reaction shown below?
2Fe + 6HC2H3O2 → 2Fe(C2H3O2)3 + 3H2
Answers
There are four. Fe, H, C, and O
A student states that a graduated cylinder contains 150 mL of water the statement is
Answers
Answer:
Explanation:
An Observation
which of the following charecteristics will not help u tell whether two solids are the same or are diferent substances?
Answers
Answer:
D. Melting point
Explanation:
A. Color
B. Hardness
C. Shape
D. Melting point
Calculate the pH of a 0.25 M solution of NaNO2 (Ka(HNO2) = 4.5 x 10^-4) (1.97)
a) pH = 3.35
b) pH = 4.45
c) pH = 5.55
d) pH = 6.65
Answers
The pH of a 0.25 M solution of NaNO2= 6.65.
Given the concentration of NaNO2, we can find the concentration of NaOH and HNO2 as follows:
NaNO2 = 0.25 MNaOH = HNO2 = x
(since they have equal concentrations due to the stoichiometry of the reaction)
Thus, we can write the equilibrium constant expression as:
Ka = x^2/0.25
Now, let's solve for x:
x^2 = 0.25 x 4.5 x 10^-4x = √(0.25 x 4.5 x 10^-4) = 0.015
This value represents the concentration of both HNO2 and NaOH. Since we are interested in pH, we need to find the concentration of H+ ions using the following equation:
Kw = [H+][OH-]
Since we have found the concentration of OH- (which is the same as the concentration of NaOH),
we can solve for H+:
Kw = 1.0 x 10^-14[H+][0.015] = 1.0 x 10^-14[H+] = 6.7 x 10^-13
Finally, we can find pH:
pH = -log[H+]pH = -log(6.7 x 10^-13)pH = 6.65
Therefore, the correct option is d) pH = 6.65.
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Question 2 of 19
The graph below shows how the temperature and volume of a gas vary when
the number of moles and the pressure of the gas are held constant. What
happens to the temperature of a gas as its volume increases?
T
A. The temperature doubles.
B. The temperature decreases.
C. The temperature remains the same.
D. The temperature increases.
PREVIOUS
Answers
Answer:
D
Explanation:
The temperature increases
When you place a glass over a candle and the flame goes out, the limiting reactant is, oxygen wax energy water
Answers
Answer:
oxygen
Explanation:
Putting the jar over the candle keeps oxygen from outside the jar from getting in. The reaction can only use the oxygen that is already in the jar. So, when that oxygen is used up, the reaction can't keep going. Running out of oxygen makes the flame go out.
What happens to wax when you burn a candle?
The heat of the flame vaporizes the liquid wax (turns it into a hot gas), and starts to break down the hydrocarbons into molecules of hydrogen and carbon. These vaporized molecules are drawn up into the flame, where they react with oxygen from the air to create heat, light, water vapour (H2O) and carbon dioxide (CO2).
What type of reaction is burning candle wax?Combustion
And when you light a candle you use the candle's wax as fuel for a chemical reaction called combustion which involves reacting hydrocarbons with oxygen, breaking them down into carbon dioxide and water.
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if 100.0 mL of liquid weighs 81.23g what is the density of the liquid
Answers
Answer:
812.3 kilogram/cubic meter
Explanation:
I used an online calculator.
Hope I helped!