A gas initially at stop is changed to 248k calculate the final pressure of the gas
The final pressure of the gas is zero, as the gas is initially at rest and remains at rest at a temperature of 248K.
To calculate the final pressure of a gas that is initially at rest and is then changed to a temperature of 248K, we need to know the relationship between pressure, temperature, and volume, which is given by the ideal gas law:
PV = nRT
Since the gas is initially at rest, its initial pressure P1 is zero. We can rearrange the ideal gas law to solve for final pressure P2:
P2 = nRT/V
Thus, the final pressure P2 depends only on absolute temperature T. Plugging in the given temperature of 248K:
[tex]P_2 = (P_1*T_2) / T_1 \\P_2 = 0 * T_2 / T_1 = 0[/tex]
[tex]P2 = 0 * R * 248K / V = 0[/tex]
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Question 1
What is thermal energy
The term "thermal energy" refers to an object's internal energy that results from the movement of its constituent particles. The temperature of the item increases with the amount of kinetic energy these particles possess.
Heat is the thermal energy that is transferred between things when their temperatures differ. Temperature is a measurement of the average kinetic energy of the particles in a substance, and it is connected to the idea of thermal energy.
When two items with different temperatures come in touch with one another, thermal energy will go from the hotter to the cooler object until they achieve thermal equilibrium, when both objects are at the same temperature. Numerous branches of research and technology, such as thermodynamics, energy transmission, and materials science, all heavily rely on thermal energy.
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Strontium-90 is present in radioactive fallout and has a half-life of 28.8 years. The first atomic detonation was at a place called Trinity Site in New Mexico in 1945 - 68 years ago. What percentage of Strontium-90 would remain in the soil at the site?
Round your answer to the nearest 5%. Example: If your answer would be greater than or equal to 32.5%, and less than 37.5%, you would report 35 - do not use a decimal or percent sign (%) after the number.
About 2.5% of Strontium-90 would remain in the soil at the Trinity Site.
Since the half-life of Strontium-90 is 28.8 years, we can use the formula for radioactive decay to calculate the percentage of Strontium-90 that would remain in the soil after 68 years:
Percentage remaining = (1/2)^(68/28.8) x 100
Solving this equation, we get:
Percentage remaining = 2.5%
This means that after 68 years, only 2.5% of the original amount of Strontium-90 would remain in the soil at the Trinity Site. The rest of the Strontium-90 would have decayed into other elements through radioactive decay. It's important to note that Strontium-90 is a dangerous radioactive isotope that can cause cancer and other health problems if ingested or inhaled, so measures should be taken to prevent people from being exposed to it.
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What is the pH of a solution that has a [H+] = 3.5 x 10-10 M?
Answer: 9.46
Explanation:
[tex]pH = -log_{10}([H^+]) = -log_{10}(3.5*10^{-10}) = 9.46[/tex]
Choose the correct statement about ionic crystals.
The total number of cations and anions are the same in ionic crystals.
Ionic crystals are good conductors of electricity.
The total charge in ionic compounds adds up to the charge of the polyatomic anion.
Alternating layers of positive and negative ions form the ionic crystal.
Discrete molecules do not exist in ionic crystals.
The correct statement about ionic crystals is Alternating layers of positive and negative ions form the ionic crystal.
What are ionic crystals?They are ions bonded by electrostatic attraction into a regular lattice to form solids.
It should be noted that the Ionic compounds are not molecules but crystals however there are many alternating positive and negative ions which are seen to be bounded together in a matrix to form crystals. The positive metal ion of an ionic compound is identified first, and then the negative nonmetal ion. Solids with high melting and boiling points are ionic compounds.
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If each ml of a solution of H2PO3 contains the equivalent of 0.5000 M of dissolved P2O5, what vol. of 2.50 M NaOH would be required to react with 20.0 ml of the acid to form HPO4?
Answer:
Thought the basicity of h3p04 is greater than h3p03, it doesn't mean that it's acidic strength is greater..Like a person who has lots of money doesn't mean that he is giving…
According to the above rule mentioned…h3po4 has 1 oxygen bonded atom and 3 OH- groups so ratio is 1/3
Similarly h3p03 has 1 double bonded oxygen and 2 OH- groups so ratio is 1/2
Since 1/2 > 1/3 …h3po3 has more acidic strength
But if we look other oxyacids of phosphorus
The trend would be HPO3 > H3PO2 > H3PO3 > H3PO4 (check the structures )
The density of a sample of NH3(g) at a pressure of 1.00 atm is 0.869 g/L. What is the square velocity (in m/s) of the molecules in this sample?
The density of a sample of NH[tex]_3[/tex](g) at a pressure of 1.00 atm is 0.869 g/L. 592m/s is the square velocity (in m/s) of the molecules in this sample.
The velocity of a gas molecule at a certain temperature, which corresponds to point P in the graph, is 200 ms. At the given temperature, the rms velocity of a gas molecule is about. Molecular count (A) 163ms (C) 245ms (B) 217 milliseconds; (D) 226 milliseconds. The rms velocity of a particular amount of gas molecules at 27oC and 1.0 105 Nm⁻² pressure is 200 msec-1.
velocity = √3p/density
=√3/0.869
=592m/s
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How many grams of the molecule in the figure below would be
equal to 1 mol of the molecule? (Carbon = 12, Oxygen = 16,
Hydrogen = 1)
A) 29
B) 30
C) 60
D) 150
E) 342
Answer: B
Explanation:
a balloon displaces 3473L at sea level what will be the displacement if it flies to an altitude where the atmospheric pressure is 10.82inHg
The displacement of the balloon at an altitude where the atmospheric pressure is 10.82 inHg would be 9,603.7 L
What is the final volume of the balloon?The displacement of a balloon is determined by the volume of air that it displaces.
Apply Boyle's as follows;
V₁P₁ = V₂P₂
V₂ = (V₁P₁) / P₂
Where;
V₁ is the initial displacement of the balloon at sea levelP₁ is the atmospheric pressure at sea level ( 29.92 inHg)P₂ is the atmospheric pressure at the new altitude ( 10.82 inHg)V₂ is the new displacement of the balloon.The final volume is calculated as follows;
V₂ = (3473 x 29.92) / (10.82)
V₂ = 9,603.7 L
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Which diagram shows the relationship between volume and pressure for a gas at constant temperature?
Pressure and volume have an indirectly proportional relationship
Explanation:Ideal gas laws can help us describe the relationship between different values for gases.
Boyle's Law
The ideal gas law that connects pressure and volume given a constant temperature is Boyle's law. Boyle's law is represented as:
P₁V₁ = P₂V₂This equation shows that pressure and volume have an indirectly proportional relationship. This means that as pressure increases, volume decreases and vice versa. So, pressure and increase opposite of each other.
Indirect Relationships
Indirect relationships occur when one value and the reciprocal of another are proportional. For example, pressure and 1/volume are directly proportional. This function looks like a decreasing exponential function. Attached is an example of a volume vs. pressure graph.
764
9. The mean weight of a group of 15 athletes was 60 kg. Two athletes whose weights were 68kg and 65 kg left the group
What is the new mean weight of the remaining athletes in the group?
The new mean weight of the remaining athletes in the group is approximately 59 kg.
To find the new mean weight of the remaining athletes in the group, we need to subtract the weights of the two athletes who left the group from the total weight of the group, and then divide by the number of remaining athletes.
First, we need to find the total weight of the group before the two athletes left:
Total weight = mean weight * number of athletes
Total weight = 60 kg * 15 athletes
Total weight = 900 kg
Next, we subtract the weights of the two athletes who left:
New total weight = 900 kg - 68 kg - 65 kg
New total weight = 767 kg
We also need to subtract the number of athletes who left from the total number of athletes:
New number of athletes = 15 athletes - 2 athletes
New number of athletes = 13 athletes
Finally, we can find the new mean weight:
New mean weight = New total weight / New number of athletes
New mean weight = 767 kg / 13 athletes
New mean weight ≈ 59 kg
Therefore, the new mean weight of the remaining athletes in the group is approximately 59 kg.
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sodium carbonate reacts with calcium chloride to produce solid calcium carbonate and sodium chloride.
Write the balanced equation for the roaction
The balanced equation for the reaction between sodium carbonate (Na2CO3) and calcium chloride (CaCl2) to produce solid calcium carbonate (CaCO3) and sodium chloride (NaCl) can be written as follows:
Na2CO3 + CaCl2 -> CaCO3 + 2NaCl
Sodium carbonate (Na2CO3) contains two sodium (Na) ions, one carbonate (CO3) ion, and calcium chloride (CaCl2) contains one calcium (Ca) ion and two chloride (Cl) ions.
To balance the equation, we need to ensure that the number of atoms of each element is equal on both sides.
On the left side, we have:
2 Na atoms (from Na2CO3)
1 C atom (from CO3)
3 O atoms (from CO3)
1 Ca atom (from CaCl2)
2 Cl atoms (from CaCl2)
On the right side, we have:
1 Ca atom (from CaCO3)
1 C atom (from CaCO3)
3 O atoms (from CaCO3)
2 Na atoms (from 2NaCl)
2 Cl atoms (from 2NaCl)
By comparing the number of atoms on both sides, we can balance the equation by adjusting the coefficients. The balanced equation is:
Na2CO3 + CaCl2 -> CaCO3 + 2NaCl
This equation shows that when sodium carbonate and calcium chloride react, they produce solid calcium carbonate and sodium chloride. The coefficients in front of each compound indicate the number of moles or molecules involved in the reaction, ensuring that the law of conservation of mass is upheld.
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A 28.3 mL sample of a solution of RbOH is
meutralized by 21.91 mL of a 1.205 M solution
of HBr. What is the molarity of the RbOH
solution?
Answer in units of M.
LO
*
17 * I
a
*
C
To answer this question, we need to know the concentration of the RbOH solution. Without this information, we cannot determine the amount of RbOH present in the 28.3 mL sample.
However, if we assume that the concentration of the RbOH solution is known, we can use the formula:
moles of solute = concentration x volume
To find the number of moles of RbOH in the 28.3 mL sample. From there, we can use the molar mass of RbOH (102.47 g/mol) to calculate the mass of RbOH in the sample.
For example, if the concentration of the RbOH solution is 0.1 M, then:
moles of RbOH = 0.1 M x 0.0283 L = 0.00283 moles
mass of RbOH = 0.00283 moles x 102.47 g/mol = 0.290 g
So, a 28.3 mL sample of a 0.1 M RbOH solution would contain 0.290 g of RbOH.
In summary, the amount of RbOH present in a 28.3 mL sample of a solution depends on the concentration of the solution. Without knowing the concentration, we cannot determine the amount of RbOH in the sample.
complete question not found in the search engine.
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At 7:00 A.M., a patient receives a 1.00-mg dose of I-131 to treat thyroid cancer.
If the nuclide has a half-life of 8.0 days, what mass of the nuclide remains in the patient at 10:00 P.M. the next day? (Assume no excretion of the nuclide from the body.)
Approximately 0.874 mg of I-131 remains in the patient's body at 10:00 P.M. the next day.
First, we need to calculate how many half-lives have elapsed from 7:00 A.M. to 10:00 P.M. the next day, which is approximately 33 hours.
33 hours / 24 hours per day = 1.375 days
1.375 days / 8.0 days per half-life = 0.172
This means that approximately 0.172 half-lives have elapsed since the initial dose.
Next, we can calculate the fraction of I-131 that remains in the patient's body using the radioactive decay equation:
[tex]fraction\ remaining = (1/2)^{(number\ of\ half-lives\ elapsed)}[/tex]
[tex]fraction\ remaining = (1/2)^{0.172}\\fraction\ remaining = 0.874[/tex]
Finally, we can calculate the mass of I-131 that remains in the patient's body:
mass remaining = initial mass x fraction remaining
mass remaining = 1.00 mg x 0.874
mass remaining = 0.874 mg
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Robert Delaunay's Homage to Blériot (1914) was inspired by
O the invention of stroboscopic photography
the construction of the Eiffel Tower
his wife's new dress designs
the first flight across the English channel
Answer:
Robert Delaunay's Homage to Blériot (1914) was inspired by the first flight across the English channel.
4. Br Study the following scheme, which shows three alternative (but not necessarily perfect) syntheses of compound B from compound A. Point out the faults and problems with the three routes, and try to decide on the most feasible route. In your answer you should address such points as competition, compatibility and timing. (Note: the reaction with CS₂/Mel/heat - the Chugaev reaction - is simply a convenient and reliable dehydration method.)
Faults and problems in three routes of compound Br(bromide) synthesis, and the most feasible route, addressing competition, compatibility, and timing.
The main course includes a nucleophilic replacement of A with MeOH within the sight of HCl, trailed by parchedness with CS₂/Mel/heat. The fundamental issue with this course is the opposition between the replacement and end responses, which could prompt low yields of the ideal item.
The subsequent course includes a comparative nucleophilic replacement of A with MeOH within the sight of TsOH, trailed by a decrease with LiAlH₄. The fundamental issue with this course is the similarity between the acidic TsOH and the diminishing specialist, which could bring about the development of undesirable side items.
The third course includes an immediate buildup of A with ethyl oxalate within the sight of K₂CO₃, trailed by a decarboxylation with H₂SO₄. The fundamental issue with this course is the planning of the decarboxylation step, which could prompt the arrangement of undesirable side items because of overcompensation.
Generally speaking, the most possible course is by all accounts the first, with cautious advancement of the response conditions to limit the opposition among replacement and disposal responses.
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From the graph, if a solution contains 80 g of potassium
chloride per 100 g of water at 10°C, the solution is said to be
It is claimed that the solution is saturated. This is due to the graph's indication that potassium chloride dissolves 80g/100g in water at 10°C. The solution is referred to as being saturated when the solute concentration equals its solubility.
When the solution can no longer dissolve the solute, saturation takes place. This is because the solution has achieved its maximum solubility and the solute particles are too big to dissolve in the solvent.
The solution is considered to be saturated at this stage. Given that potassium chloride dissolves 80g/100g in water at 10°C in the graph, the solution is saturated.
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Is particles rearrange into new combinations, forming new substances a physical change or chemical change?
Particles rearranging into new combinations and forming new substances is a chemical change.
This is because in a chemical change, the bonds between atoms or molecules are broken and new bonds are formed to create a different substance with unique properties. This process usually involves the release or absorption of energy in the form of heat, light, or sound.
On the other hand, a physical change involves a change in the physical appearance or state of matter of a substance without changing its chemical identity. Examples of physical changes include melting, freezing, boiling, and changes in size, shape, or color.
In the case of particles rearranging into new combinations and forming new substances, the resulting substance has different chemical properties than the original substance. For example, if you burn a piece of paper, the paper undergoes a chemical change as it is transformed into ash, which has different properties than the paper. This is why it is important to understand the difference between physical and chemical changes in science and everyday life.
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10th grade chemistry. I’m so confused on what I need to do. What do I draw?
In chemistry, drawing chemical structures is a fundamental skill that allows us to communicate and understand chemical concepts.
A chemical structure is a diagram of a molecule or compound that depicts the arrangement of atoms as well as the chemical bonds that hold them together. Depending on the complexity of the molecule and the level of detail required, there are various methods for drawing chemical structures. Lewis structures, line structures, and condensed structures are the most prevalent types of chemical structures.Lewis structures are diagrams that depict a molecule's valence electrons and bonding patterns. To create a Lewis structure, you must first determine how many valence electrons each atom has and then use them to form bonds and fill octets.
When designing Lewis structures, you should additionally consider formal charges, resonance, and electronegativity.Line structures are a method of depicting molecules that is simplified by the use of lines to represent bonds and atoms. In line structures, each vertex or endpoint represents a carbon atom unless otherwise indicated. Hydrogen atoms are not usually shown unless they are attached to a heteroatom. Line structures are useful for quickly drawing and comparing structures, but they do not show the three-dimensional arrangement of atoms.Condensed structures are another way of representing molecules by using symbols and abbreviations to represent atoms and functional groups. In condensed structures, bonds are implied rather than drawn, and atoms are listed in the order of their connectivity.
Condensed structures are useful for representing large and complex molecules, but they can be ambiguous and difficult to read without practice.
Overall, drawing chemical structures is an essential skill in chemistry that requires practice and attention to detail. By learning how to draw Lewis structures, line structures, and condensed structures, you can better understand chemical concepts and communicate your ideas to others.
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how many rotating earth periods does jupiter experience in 1 earth week?
For the equilibrium 2SO3 (g) ⇔ 2SO2 (g) + O2 (g), Kc = 5.27x10-2 at 577 K. Calculate the value of Kp. (R= 0.08206 L-atm / mol-K)
A. 250
B. 2.49x10-4
C. 2.5
D. 2.49x10-2
E. 2.49x10-6
The value of Kp for the equilibrium is [tex]2.49*10^{-2}[/tex], which corresponds to option D.
The question provides the equilibrium reaction
[tex]2SO_3 (g)[/tex] ⇔ [tex]2SO_2 (g) + O_2 (g)[/tex]
and the equilibrium constant, Kc, at a certain temperature of 577 K. The task is to calculate the corresponding equilibrium constant in terms of partial pressures, Kp, using the gas constant R = 0.08206 L-atm/mol-K.
The equation relating Kc and Kp is Kp = Kc(RT)^Δn, where Δn is the difference between the total number of moles of gaseous products and the total number of moles of gaseous reactants. In this case, there are three moles of gas on the product side and two moles of gas on the reactant side, so Δn = 3 - 2 = 1.
Substituting the given values into the equation, we get:
Kp = Kc(RT)^Δn
= (5.27x10^-2)((0.08206 L-atm/mol-K)(577 K))^1
= [tex]2.49*10^{-2}[/tex]
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You are a nurse and you have several patients that need treatment. Thank goodness you were taught how to manipulate gas laws in order to help the patients. Help each patient solve the issue they are encountering. Patient C needs oxygen administered due to difficulty breathing. Check how many mols of gas is in a cylinder that has a volume of 5L at 13700 kPa, at atmospheric pressure and room temperature at 20 degrees Celsius.
There are 2.49 moles of gas in the cylinder, which can be used to administer oxygen to a patient who is experiencing difficulty breathing.
The ideal gas law is PV=nRT, where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin.
To use this equation, we need to convert the temperature from Celsius to Kelvin by adding 273.15. The atmospheric pressure is 101.3 kPa. Once we have all the variables, we can rearrange the equation to solve for n, the number of moles of gas in the cylinder.
n = PV/RT
Plugging in the given values, we get:
[tex]n = (13700 kPa * 5 L) / (8.314 J/mol*K * (20+273.15) K) \\n = 2.49 mol[/tex]
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The mass of an evacuated 265 mL flask is
143.147 g. The mass of the flask filled with 271
torr of an unknown gas at 30 °C is 144.247 g
Calculate the molar mass of the unknown gas.
The molar mass of the unknown gas is 228.5 g/mol.
Given:
Volume = 265 mL
Mass = 143.147 g
Temperature = 30 °C
1 atm = 760 torr
271 torr = 0.356 atm
Use the ideal gas law:
PV = nRT
where P is the pressure of the gas, V is the volume of the flask, n is the number of moles of gas, R is the ideal gas constant, and T is the temperature of the gas in Kelvin.
n = PV/RT
n = (0.356 atm)(0.265 L) / (0.08206 L·atm/mol·K)(303.15 K)
n = 0.00481 mol
Calculate the mass of the gas:
Mass = total mass - flask mass
Mass = 144.247 g - 143.147 g
Mass = 1.1 g
Calculate the molar mass of the gas:
Molar mass = mass / n
Molar mass = 1.1 g / 0.00481 mol
Molar mass = 228.5 g/mol
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PLEASE HELP, I NEED THESE TWO PAGES FINISHED ASAP !!!! RUNNING OUT OF TIME !!!
Background sources of radiation.
Radon gas from the ground
Cosmic rays (altitude affects the exposure, so highest in aircraft and on the ISS)
Food, especially produce high in the isotope potassium-40
Natural radioisotopes in water
Natural radioisotopes in rocks and minerals, especially uranium and thorium
Isotopes in building materials, such as limestone, concrete, and bricks
Medical tests, mostly from CT scans, plus some from X-rays and other nuclear medicine (radiation for cancer treatment is not considered background)
Nuclear weapons testing
Nuclear and coal power
Nuclear accidents
Depleted uranium shells
Cigarettes (from polonium)
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50 points, and I’ll mark as brainliest!!!!!
Tasks are in the picture.
pH determines the acidic or alkaline a solution is using the pH scale, which has a range of 0 to 14. An alkaline pH is greater than 7, while an acidic pH is less than 7.
Thus, The pH of a solution is defined mathematically as the negative logarithm of the molar concentration of hydrogen ions therein.
NaOH is a strong alkaline, as indicated by a pH testing strip, but in order to determine its exact pH, you must first determine its molarity.
A scale known as pH is used to describe how basic or acidic a water-based solution is. Basic solutions have a higher pH than acidic solutions, which have a lower pH.
Thus, pH determines the acidic or alkaline a solution is using the pH scale, which has a range of 0 to 14. An alkaline pH is greater than 7, while an acidic pH is less than 7.
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The pH of HNO₂ is 2.15, pH of NH₄OH is 10.98 and pH of H₂S is 3.76.
pH is defined as the negative logarithm of H⁺ ion concentration.
pH is a measure of how acidic or basic a substance is. In our everyday routine, we encounter and drink many liquids with different pH. Water is a neutral substance. Soda and coffee are often acidic.
The pH is an important property, since it affects how substances interact with one another and with our bodies. In our lakes and oceans, pH determines what creatures are able to survive in the water.
Given,
1. Concentration = 0.1
Ka = 4.5 × 10⁻⁴
[tex]pH = \frac{1}{2} (pka - log c)[/tex]
pH = 0.5 × ( 3.3 + 1)
= 2.15
2. Concentration = 0.05
Ka = 1.8 × 10⁻⁵
[tex]pOH = \frac{1}{2} (pkb - log c)[/tex]
pOH = 0.5 × ( 4.74 + 1.3)
= 3.02
pH = 14 - pOH
= 14 - 3.02
= 10.98
3. Concentration = 0.3
Ka = 1 × 10⁻⁷
[tex]pH = \frac{1}{2} (pka - log c)[/tex]
pH = 0.5 × ( 7 + 0.52)
= 3.76
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What is the molarity of a solution that contains 28.5 g of copper (Il) chloride (CUC|2) in
1.50 L of solution? (Show all work, label all units, and draw a box around your final answer)
The molarity of the solution is 0.299 M, given that it contains 28.5 g of CuCl₂ in 1.50 L of solution.
To find the molarity, using the formula,
Molarity (M) = moles of solute / volume of solution in liters
First, we need to calculate the number of moles of copper (II) chloride in 28.5 g. We can use the molar mass of CuCl₂ to convert the mass to moles,
Molar mass of CuCl₂ = 63.55 g/mol
moles of CuCl₂ = 28.5 g / 63.55 g/mol
moles of CuCl₂ = 0.449 mol
Now we can calculate the molarity using the formula,
Molarity (M) = moles of solute / volume of solution in liters
Molarity (M) = 0.449 mol / 1.50 L
Molarity (M) = 0.299 M (rounded to three significant figures)
Therefore, the molarity of the solution is 0.299 M.
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Below is a graph of the number of caterpillars in the corn field over 30 years. Which statement is most likely true? 1073 AQ 4 A. Normal corn, with insecticide, no refuge field. B. Normal corn, with insecticide, with refuge field. C. Caterpillar-resistant corn, no pesticide, no refuge field. D. Caterpillar-resistant corn, no pesticide, with refuge field.
Note that the based on the graph of the statement that is most likely true, is "Caterpillar-resistant corn, no pesticide, no refuge field." (Option C)
What is a graph?In discrete mathematics, and more particularly in graph theory, a graph is a structure consisting of a set of objects, some of which are "related" in some way.
The items correspond to mathematical abstractions known as vertices, and each pair of connected vertices is known as an edge.
Graphs are a popular way to visually depict data connections. A graph's objective is to convey facts that is too many or intricate to be fully expressed in words and in less space.
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Full Question:
Below is a graph of the number of caterpillars in the corn field over 30 years. Which statement is most likely true?
answer choices
Normal corn, with insecticide, no refuge field.
Normal corn, with insecticide, with refuge field.
Caterpillar-resistant corn, no pesticide, no refuge field.
Caterpillar-resistant corn, no pesticide, with refuge field.
If you have 10,000 grams of a substance that decays with a half-life of 14 days, then how much will you have after 70 days?
Show your work and round your answer to the nearest whole number.
Answer:
approximately 313 grams
Explanation:
After 1 half-life (14 days), the amount of substance remaining is half of the original amount:
10,000 grams / 2 = 5,000 grams
After 2 half-lives (28 days), the amount remaining is half of the amount remaining after 1 half-life:
5,000 grams / 2 = 2,500 grams
After 3 half-lives (42 days), the amount remaining is half of the amount remaining after 2 half-lives:
2,500 grams / 2 = 1,250 grams
After 4 half-lives (56 days), the amount remaining is half of the amount remaining after 3 half-lives:
1,250 grams / 2 = 625 grams
After 5 half-lives (70 days), the amount remaining is half of the amount remaining after 4 half-lives:
625 grams / 2 = 312.5 grams
Rounding to the nearest whole number, you would have approximately 313 grams remaining after 70 days.
Mcq which of the following is necessary before conducting any experiment in scientific research
Before conducting any experiment in scientific research, it is necessary to do proper research. Research involves gathering information and knowledge about the topic or subject that is being studied.
It includes reviewing existing literature, theories, and studies related to the research question, understanding the problem, identifying variables, and forming hypotheses.
The purpose of research is to gain a comprehensive understanding of the subject matter and to identify any gaps in knowledge or understanding that need to be addressed. It is important to conduct thorough research to ensure that the experiment is well-designed, relevant, and meaningful.
Once the research has been conducted, the next step is to design an experiment that is based on the research findings. This involves identifying the variables that will be manipulated and measured, developing a procedure for conducting the experiment, and selecting appropriate methods for data collection and analysis.
In summary, before conducting any experiment in scientific research, it is necessary to do proper research. This involves gathering information and knowledge about the subject matter to ensure that the experiment is well-designed and relevant. By doing so, researchers can ensure that their experiments are conducted in a rigorous and scientifically valid manner, leading to reliable and accurate results.
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Several balloons are inflated with helium to a volume of 0.75 ml at 27 degrees Celsius. One of the ballon's was found several hours later, the temperature has dropped to 22 degrees Celsius What would be the volume of the balloon when found, if no helium escaped?
If no helium escaped, the volume of the balloon when found would be approximately 0.738 ml.
To solve this problem, we can use the combined gas law, which relates the pressure, volume, and the temperature of a gas:
[tex]P_1V_1/T_1 = P_2V_2/T_2[/tex]
We can assume that the pressure of the helium in the balloon remains constant, and we can also assume that the balloon does not leak or lose any of the helium. Therefore, we can set [tex]P_1 = P_2[/tex] and cancel out the pressure terms:
[tex]V_1/T_1 = V_2/T_2[/tex]
We can plug in the values given in the problem and solve for [tex]V_2[/tex], the final volume of the balloon:
[tex]V_1 = 0.75 ml \\T_1 = 27 °C + 273.15 = 300.15 K \\ T_2 = 22 °C + 273.15 = 295.15 K[/tex]
[tex]V_2 = V_1 * (T_2/T_1) = 0.75 ml * (295.15 K/300.15 K)[/tex] ≈ 0.738 ml
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