Answer:
Globe valve
[tex]hope \: it \: helps[/tex]
At 550 degree Celsius the Kp is found to be 12.2. Is the reaction endo. or exo. Justify
The Kp value for an exothermic reaction is greater than 1, and the Kp value for endothermic reaction is less than 1. The Kp value of 12.2 is greater than 1, so it is an exothermic reaction.
To determine if a reaction is endothermic or exothermic using the given Kp value at 550°C, we need to consider the effect of temperature on Kp for the reaction. The terms "Kp", "endothermic", and "exothermic" are related to each other in the following way:
1. Kp represents the equilibrium constant for a reaction at a specific temperature, which is related to the reaction's favorability.
2. Endothermic reactions absorb heat from the surroundings, while exothermic reactions release heat.
In this case, we don't have enough information to definitively determine if the reaction is endothermic or exothermic just based on the Kp value at 550°C. To make this determination, we would need additional information, such as how the Kp value changes with temperature or the enthalpy change (∆H) of the reaction. If Kp increases with an increase in temperature, the reaction would be endothermic. If Kp decreases with an increase in temperature, the reaction would be exothermic.
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Question 43 Marks: 1 A primary pollutant is one that is formed in the atmosphere as a result of chemical reactions.Choose one answer. a. True b. False
a. True.A primary pollutant is one that is formed in the atmosphere as a result of chemical reactions.
Air pollution has the ability to contaminate both the water and soil surfaces. This could result in crop mortality or reduced agricultural productivity. As a result, young plants and trees may perish. When sulphur dioxide and nitrogen oxide particles in the air interact with atmospheric water and oxygen, acid rain may result.
The combination of gases and solid particles in the air results in air pollution. Dust, pollen, mould spores, industrial chemicals, and vehicle exhaust are a few examples of particles. The gas ozone is a prominent source of urban air pollution. The term "smog" is used to refer to ozone-based air pollution. There are certain hazardous air pollutants.
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44. Calculate the mass of 0.00456 moles of (NH4)2SO4A) 132 g B) 3.45 x 10-5 g C) 114 g D) 0.603 g E) 0.520 g
A) 132 g
Explanation:
The molar mass of (NH4)2SO4 can be calculated as follows:
Molar mass of NH4 = 14.01 g/mol
Molar mass of SO4 = 96.06 g/mol
Molar mass of (NH4)2SO4 = (2 x 14.01 g/mol) + (1 x 32.07 g/mol) + (4 x 16.00 g/mol) = 132.14 g/mol
Therefore, the mass of 0.00456 moles of (NH4)2SO4 is:
Mass = 0.00456 moles x 132.14 g/mol = 0.603 g
The correct answer is D) 0.603 g.
Explanation:
The molar mass of (NH4)2SO4 is the sum of the molar masses of its constituent elements. We can calculate the molar mass of each element by looking up their atomic masses on the periodic table. The molar mass of NH4 is (1 x 14.01 g/mol) + (4 x 1.01 g/mol) = 18.05 g/mol, and the molar mass of SO4 is (1 x 32.07 g/mol) + (4 x 16.00 g/mol) = 96.06 g/mol.
To calculate the molar mass of (NH4)2SO4, we need to multiply the molar mass of NH4 by 2 (since there are 2 NH4 groups in the compound) and add it to the molar mass of SO4. This gives us:
Molar mass of (NH4)2SO4 = (2 x 18.05 g/mol) + 96.06 g/mol = 132.14 g/mol
Now we can use this molar mass to calculate the mass of 0.00456 moles of (NH4)2SO4:
Mass = 0.00456 moles x 132.14 g/mol = 0.603 g
Therefore, the correct answer is D) 0.603 g.
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Why is molten salt a good conductor of electricity
Answer:
some of the salt molecules are dissociated into ions, which allows the ions to conduct electricity.
Explanation:
hope it helps
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Order the specific steps needed to make a standard solution of copper (II) sulfate from anhydrous coppoer
(II) sulfate crystals.
Carefully fill the volumetric flask unit the to of the meniscus reaches the 100 mL line
Carefully transfer the dissolved solute into a volumetric flask. Be sure to rinse your
beaker with a little water and add this rinse to the volumetric flask as well
Use an eyedropper to add water until the bottom of the meniscus touches the 100 mL
line. If you overshoot, discard the solution and start over.
Dissolve the solute in the beaker with as little distilled water as possible
Measure the appropriate mass of solute CuSO4(s) and place it into a small beaker
Stopper the volumetric flask. Firmly hold the stopper in place and invert the flask 15
times to mix the solution.
Measure the appropriate mass of solute Cupric sulfate(s) and place it into a small beaker. Dissolve the solute in the beaker with as little distilled water as possible. Carefully transfer the dissolved solute into a volumetric flask.
Which technique is utilised to create crystals of copper sulphate?One method that is frequently used to prepare copper sulphate is crystallisation. An electrolytic technique is used to create the chemical. The electrolyte solution contains sulfuric acid, and the two electrodes are composed of copper.
What method may be applied to clean up a sample of copper sulphate?The impure sample is dissolved in a suitable solvent, heated in a water bath, and then let to stand in order to recrystallize the impure material into pure copper sulphate.
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Factors Affecting the Germicidal Activity of Chemicals
•Nature of the_____ being treated
•Nature of the____ being treated
•Degree of_____
•Time of_____-
•______and______ action of the germicide
Factors Affecting the Germicidal Activity of Chemicals:
• Nature of the microorganisms being treated
• Nature of the material being treated
• Degree of contamination
• Time of exposure
• Concentration and chemical action of the germicide
The nature of the microorganisms being treated is an important factor in determining the effectiveness of a germicide. Different microorganisms have different structures and chemical compositions, which can affect how they are affected by germicidal chemicals.
The nature of the material being treated is also important, as some materials can be more difficult to penetrate and disinfect than others. Porous materials, for example, can be more difficult to disinfect than non-porous materials.
The degree of contamination is another important factor, as heavily contaminated surfaces or materials may require higher concentrations of germicide or longer exposure times to achieve effective disinfection.
The time of exposure is also critical, as most germicides require a certain amount of contact time to be effective. This can vary depending on the type of germicide and the concentration used.
Finally, the concentration and chemical action of the germicide are important factors in determining its effectiveness. Different germicides have different mechanisms of action, and some may be more effective against certain types of microorganisms than others.
The concentration of the germicide also plays a role, as higher concentrations may be required for effective disinfection.
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what is partial pressure of oygen in a container holding a mixture of nitrogen, carbon and oygen gases at a total pressure of 760. torr?
According to the question the partial pressure of oxygen would be 76 torr
What is oxygen?Oxygen is an odorless, colorless and tasteless chemical element that is essential to all forms of life. It is a member of the chalcogen family, which includes sulfur, selenium and tellurium. Oxygen is the most abundant element on Earth, making up around 21% of the atmosphere. It is the third most common element found in the universe, after hydrogen and helium.
The total pressure of the mixture is 760 torr, and the partial pressure of oxygen can be calculated by multiplying the total pressure by the ratio of the volume of oxygen to the total volume of the mixture.
For example, if the oxygen volume is 10% of the total volume,
the partial pressure of oxygen would be 76 torr (760 * 0.10 = 76).
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5.5. Expansion joints are provided in a structure in order to A. reduce thermal movement.
B. prevent thermal movement.
C. permit thermal movement.
D. produce thermal movement.
The correct answer is C. Expansion joints are provided in a structure in order to permit thermal movement.
These joints allow for the expansion and contraction of materials due to changes in temperature, preventing stress and damage to the structure. The purpose of expansion joints in a structure is to allow for the thermal expansion and contraction of the material that makes up the structure. Thermal movements caused by temperature changes can cause stresses that can weaken the structure over time. Expansion joints provide a space that allows the material to expand and contract without putting strain on the structure, thus preserving its integrity.
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A balloon is inflated with 4.0 L of gas in a room with a temperature of 26 °C. The next day the temperature in the room is 18°C. What is the volume of gas in the balloon if the pressure is constant?
SHOW YOUR WORK
Answer:
the volume of gas in the balloon is 3.89L
What is an amino acid called after it becomes a part of a peptide?
An amino acid that becomes a part of a peptide is called a residue. Specifically, it is called an amino acid residue because the carboxyl group (-COOH) of one amino acid reacts with the amino group ([tex]-NH_2[/tex]) of another amino acid to form a peptide bond, resulting in the loss of a water molecule and the formation of a peptide chain.
As a result, each amino acid that is incorporated into a peptide chain loses its carboxyl group and its amino group, and becomes a residue.
Amino acids are the building blocks of proteins, which are long chains of amino acids linked together by peptide bonds. When two amino acids are linked together by a peptide bond, the resulting molecule is called a dipeptide. As more amino acids are added to the chain, the molecule becomes a polypeptide.
Each amino acid in a peptide chain is called a residue because it no longer has its original chemical properties as an individual amino acid. Instead, it is a part of a larger molecule and contributes to the overall properties of the peptide or protein.
Each amino acid residue in a peptide chain has a specific position or location in the chain, which is designated by its position number. For example, the first amino acid in a peptide chain is referred to as the N-terminus, while the last amino acid is referred to as the C-terminus.
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You own some sterling silver jewelry. Sterling silver is a solid solution of 92.5 wt.% silver and 7.5 wt.% copper. How many phases does Sterling silver have
Sterling silver have 2 phases. It is a binary alloy made up of two elements, silver and copper. The composition of sterling silver is 92.5 wt.% silver and 7.5 wt.% copper.
Since this is a binary system with two components, there are two phases that coexist within the alloy. One phase is rich in silver and the other is rich in copper.
These two phases have distinct properties such as their crystal structure, density, and melting point. The properties of sterling silver, such as its strength and corrosion resistance, are determined by the relative amounts and distribution of the two phases within the alloy.
Therefore, the presence of two phases in sterling silver makes it a complex material with unique properties that make it suitable for a variety of applications, including jewelry making and decorative arts.
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Question 55
A major effect of stratospheric ozone layer depletion is
a. Increase in incidence of non-melanoma skin cancer
b. Higher mean temperature on the Northern Hemisphere
c. Increase in phytoplankton population
d. Increase rate of photosynthesis in plants
The major effect of stratospheric ozone layer depletion is an increase in the incidence of non-melanoma skin cancer.
This is because the ozone layer plays a crucial role in absorbing harmful ultraviolet (UV) radiation from the sun. When the ozone layer is depleted, more UV radiation reaches the earth's surface, increasing the risk of skin cancer.
A constant drop of roughly 4% in the total amount of ozone in the Earth's atmosphere and a significantly bigger seasonal decrease in stratospheric ozone (the ozone layer) around the planet's poles are the two connected phenomena that make up ozone depletion, which have been detected since the late 1970s. The ozone hole is a term used to describe the latter event. Along with these stratospheric events, there are also polar tropospheric ozone depletion events that occur in the spring.
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What is the formula for the ionic compound containing calcium ions and nitrate ions?A) Ca3N2 B) Ca(NO3)2 C) Ca2NO3 D) Ca2NO2 E) CaNO3
The correct formula for the ionic compound containing calcium ions and nitrate ions is B) Ca(NO3)2.
A compound's identity is revealed by its chemical composition. The formula indicates which atoms are present in the substance and frequently also suggests how they are organised. For instance, the chemical formula for acetic acid can be expressed as Ca(NO₃)₂. The second indicates that a methyl group is linked to a carbon atom that contains two oxygen atoms, one of which has a hydrogen atom on it.
The formula for the ionic compound containing calcium ions (Ca²⁺) and nitrate ions (NO₃⁻) is Ca(NO₃)₂. Therefore, the correct answer is B) Ca(NO₃)₂.
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Question 22
Another name for epsom salt is:
a. sodium sulfate
b. calcium sulfate
c. zinc sulfate
d. magnesium sulfate
The correct answer is d. magnesium sulfate. Another name for epsom salt is magnesium sulfate.
Magnesium sulfate, commonly known as Epsom salt, is a naturally occurring mineral composed of magnesium, sulfur and oxygen. It is a white crystalline solid that is highly soluble in water and has many uses, including as a bath salt, fertilizer, laxative and for various medical applications.Epsom salt is a magnesium sulfate compound that is commonly used for various home and health remedies. It is also known as magnesium sulfate, magnesium sulfate heptahydrate, and Epsomite.
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Question 37
The pH of a solution in which the apparent hydrogen ion concentration is equal to 1 x 10-8 moles per liter is:
a. 2
b. 4
c. 6
d. 8
This is because the pH is the negative logarithm (base 10) of the hydrogen ion concentration. So, if the hydrogen ion concentration is 1 x 10-8 moles per liter, then the pH can be calculated as follows. The correct answer is d. 8.
pH = -log[H+]
pH = -log(1 x 10-8)
pH = -(-8)
pH = 8
Therefore, the pH of the solution is 8.
To determine the pH of a solution with an apparent hydrogen ion concentration of 1 x 10^-8 moles per liter, you can use the pH formula:
pH = -log10[H+]
where [H+] represents the hydrogen ion concentration.
Step 1: Plug in the given hydrogen ion concentration into the formula:
pH = -log10(1 x 10^-8)
Step 2: Calculate the logarithm:
pH = -(-8)
Step 3: Simplify the result:
pH = 8
So, the pH of the solution is 8 (Option d).
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Question 28
Diatomaceous earth filters:
a. Should be supplemented by a chlorination system
b. Should be integrated into a rapid sand filtration system
c. Can be used for a public water treatment system
d. Cane be used in a public sewer treatment system
Diatomaceous earth filters c. Can be used for a public water treatment system.
Diatomaceous earth filters are effective in removing particles and impurities from water. While they can be used as part of a public water treatment system, they may be combined with other methods, such as a chlorination system for disinfection or a sand filtration system for further filtration. However, diatomaceous earth filters are not typically used in public sewer treatment systems.
Diatomaceous earth filters are not typically used in public sewer treatment systems as they are designed to remove particles from water, and not sewage. In sewer treatment systems, other types of filtration and treatment methods are typically used, such as activated sludge processes, sedimentation tanks, and anaerobic digestion systems.
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Question 27
When the chlorine is added to water
a. one acid is formed
b. two primary acids are formed
c. I-IC1 is considered the primary product
d. ozone is produced in large quantities
When the chlorine is added to water, option A: one acid is formed- called hypochlorous acid.
Hypochlorous acid (HOCl) and hypochlorite ions (OCl-), the principal disinfection components in chlorinated water, will occur when any kind of chlorine is added to water during the treatment process.
A Form of Chlorine + H₂O → HOCl + OCl⁻
Hypochlorous acid is the more efficient of the two. The pH of the water before chlorine is added determines how much of each chemical is present in the water. The hypochlorous acid will rule at lower pH values. What is referred to as "free chorine" is created when hypochlorous acid and hypochlorite ions combine. Compared to other forms of chlorine, including chloramines, free chlorine has a higher oxidation potential and is hence a more strong disinfectant.
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How to ensure enough sample has been spotted on spotting line (vs. having too concentrated a sample - what is the problem with this?)
To ensure that enough sample has been spotted on the spotting line during TLC (thin-layer chromatography), it is important to spot the sample carefully and consistently.
Here are some tips to ensure that you are spotting enough sample:
Use a calibrated micropipette or syringe to apply a precise amount of sample onto the TLC plate. It is important to use the same volume of sample for each spot.Use a spotting guide or template to ensure that the spots are placed at the same distance from each other and from the bottom edge of the plate.Apply the sample slowly and steadily, allowing it to soak into the TLC plate. Avoid applying the sample too quickly or forcefully, as this can cause the spot to spread and become too large.If necessary, apply multiple spots of the sample to ensure that enough material has been applied.Having too concentrated a sample on the spotting line can cause problems in TLC, as it can lead to overlapping spots or smeared spots. This can make it difficult to interpret the results and identify the compounds in the sample.
In addition, if the sample is too concentrated, it may not migrate properly on the TLC plate and may not separate into distinct spots. To avoid these issues, it is important to use a small amount of sample and to ensure that it is spotted carefully and consistently.
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1)Paul added some pure potassium nitrate crystals to a cold water in a beaker and stirred the mixture. A few of the crystals did not dissolve at room temperature. i). Give reasons why some crystals did not dissolve ii). What would be observed if the contents of the beaker were warmed? Explain. iii). What would happen if the contents of the beaker were cooled back to room temperature?
Answer:
Potassium nitrate (KNO3) crystals were insoluble in water at room temperature. Heating the solution increases the solubility of the crystals in water
Potassium nitrate (KNO3) crystals were insoluble in water at room temperature. Heating the solution increases the solubility of the crystals in water.
What is solubility?Solubility is defined as the ability of a substance which is basically solute to form a solution with another substance. There is an extent to which a substance is soluble in a particular solvent. This is generally measured as the concentration of a solute present in a saturated solution.
The solubility mainly depends on the composition of solute and solvent ,its pH and presence of other dissolved substance. It is also dependent on temperature and pressure which is maintained.Concept of solubility is not valid for chemical reactions which are irreversible. The dependency of solubility on various factors is due to interactions between the particles, molecule or ions.
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. In total, the human body uses more than _______ elements in ways and quantities that are unique to
us.
The Human body uses more than 60 elements in ways and quantities that are unique to us. The human body is a complex organism that requires a wide range of essential elements for its proper functioning. These elements, also known as trace elements or micronutrients, are required in small quantities but play critical roles in various biological processes. Examples of essential elements include calcium, phosphorus, potassium, sodium, magnesium, iron, zinc, copper, manganese, iodine, selenium, and many others.
These elements are involved in diverse physiological functions such as enzymatic reactions, cellular signaling, bone formation, immune response, metabolism, and DNA synthesis, among others. Each element has a specific role in the body, and their deficiencies or excesses can have significant impacts on health and well-being. The unique utilization of these elements in the human body is a testament to the complexity and intricacy of human biology.
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Consider the chemical change AÛB. After the reaction starts, but before the system reaches equilibrium, the only process that takes places is A being converted into B.
A) True
B) False
False. Prior to the system reaching equilibrium, additional activities including the reverse reaction, reactant consumption, and product production are occurring as A is being transformed into B during the reaction.
The reactants are transformed into products during a chemical reaction through a sequence of processes. In addition to pushing ahead, the system is also shifting backward. As a result, processes other than A being changed into B are occurring. For instance, the opposite reaction, in which B is changed back into A, is also present.
Additionally, reactant consumption takes place, which means that when A is consumed during the forward reaction, its concentration declines. As B is created by the forward reaction, its concentration rises concurrently. As B is eaten, A is created in the opposite reaction, and vice versa. Therefore, it is untrue to state that the sole action occurring in a chemical reaction prior to equilibrium is the transformation of A into B. The response is a dynamic process that involves several simultaneous processes that all work together to bring the system's final equilibrium state about.
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the following structure does not obey the octet rule. group of answer choices co2 so3 cbr4 ccl4 co32-
The structure that does not obey the octet rule is CO32-. The other choices (CO2, SO3, CBr4, and CCl4) all follow the octet rule, meaning that the central atom in each molecule has eight valence electrons in its outer shell.
However, in CO32-, the central carbon atom has 10 valence electrons in its outer shell, which is not in accordance with the octet rule. The structure that does not obey the octet rule among the given choices is SO3 (sulfur trioxide).
In this molecule, sulfur has 6 valence electrons and forms 3 double bonds with the oxygen atoms. However, this results in a total of 12 electrons around sulfur, which exceeds the octet rule.
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To determine which structure does not obey the octet rule among CO2, SO3, CBr4, CCl4, and CO3^2-, let's briefly discuss the octet rule and analyze each structure.
The octet rule states that atoms tend to form bonds in such a way that they achieve a stable electron configuration with eight electrons in their valence shell.
1. CO2 (Carbon Dioxide): Carbon forms double bonds with both oxygen atoms. In this case, each atom has a complete octet.
2. SO3 (Sulfur Trioxide): Sulfur forms double bonds with three oxygen atoms. Sulfur can expand its octet, and all atoms have a complete octet in this structure.
3. CBr4 (Carbon Tetrabromide): Carbon forms single bonds with four bromine atoms. All atoms have a complete octet.
4. CCl4 (Carbon Tetrachloride): Carbon forms single bonds with four chlorine atoms. All atoms have a complete octet.
5. CO3^2- (Carbonate Ion): Carbon forms double bonds with one oxygen atom and single bonds with two other oxygen atoms. There are also two additional electrons, making the ion have a 2- charge. However, one of the oxygen atoms does not have a complete octet.
Therefore, the structure that does not obey the octet rule among the given choices is the CO3^2- (Carbonate Ion).
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Question 28 Marks: 1 The gas causing the distinct "rotten egg" odor in many water sources isChoose one answer. a. hydrogen sulfide b. carbon dioxide c. chlorine gas d. hydrogen carbonate
The gas causing the distinct "rotten egg" odor in many water sources is hydrogen sulfide (H2S).
Hydrogen sulfide (H2S) is a colorless gas with a distinct, unpleasant odor that is often described as smelling like rotten eggs. It is produced by the natural decomposition of organic matter, such as in swamps, sewage treatment plants, and manure pits. It is also produced by some industrial processes, such as petroleum refining and paper production.
Hydrogen sulfide is highly toxic, even at low concentrations, and can cause a range of health effects, including headaches, dizziness, nausea, and even death at high concentrations. It is also flammable and can form explosive mixtures with air.
In water sources, hydrogen sulfide can occur naturally or as a result of human activity, such as mining or drilling. It is often found in well water and can cause water to have a foul taste and smell. The presence of hydrogen sulfide in water can also cause corrosion of plumbing fixtures and appliances, as well as staining of clothing and other materials.
Hydrogen sulfide can be removed from water using a variety of methods, including aeration, oxidation, and chemical treatment. Aeration involves exposing the water to air, which allows the hydrogen sulfide gas to escape into the atmosphere. Oxidation involves adding an oxidizing agent, such as chlorine or hydrogen peroxide, to the water to convert the hydrogen sulfide gas to sulfate. Chemical treatment involves adding chemicals such as iron salts or activated carbon to the water to remove the hydrogen sulfide.
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The pressure within a cylinder with a volume of 14.5L and 25°C is 530 torr. What is the new pressure when it is heated to 80°C and compressed to a volume of 5.7L?
Answer:
To solve this problem, we can use the combined gas law, which relates the pressure, volume, and temperature of a gas:
P1V1/T1 = P2V2/T2
where P1, V1, and T1 are the initial pressure, volume, and temperature, and P2, V2, and T2 are the final pressure, volume, and temperature.
Substituting the given values into the equation, we get:
P1 = 530 torr
V1 = 14.5 L
T1 = 25°C + 273.15 = 298.15 K
V2 = 5.7 L
T2 = 80°C + 273.15 = 353.15 K
P1V1/T1 = P2V2/T2
530 torr × 14.5 L / 298.15 K = P2 × 5.7 L / 353.15 K
Simplifying the equation, we get:
P2 = (530 torr × 14.5 L × 353.15 K) / (298.15 K × 5.7 L)
P2 = 2929.37 torr
Therefore, the new pressure when the cylinder is heated to 80°C and compressed to a volume of 5.7L is approximately 2929.37 torr.
Explanation:
please match the following responses with the questions below. - the primary standard used for this experiment. - at what place does an indicator change color during a titration? - used during a titration to measure the volume of titrant delivered. - used in measuring the 6m naoh to prepare the titrant. a. none of the above b. phenolphtahlein c. buret d. 6m naoh (sodium hyroxide) e. khc8h4o4 potassium hydrogen phthalate f. primary standard g. titrant h. endpoint i. pump dispensor
The following responses with the questions below are matched correctly :-
- the primary standard used for this experiment: f. primary standard
- at what place does an indicator change color during a titration?: h. endpoint
- used during a titration to measure the volume of titrant delivered: c. buret
- used in measuring the 6m naoh to prepare the titrant: e. khc8h4o4 potassium hydrogen phthalate
1. the primary standard used for this experiment: e. khc8h4o4 potassium hydrogen phthalate (primary standard)
2. at what place does an indicator change color during a titration?: h. endpoint
3. used during a titration to measure the volume of titrant delivered: c. buret
4. used in measuring the 6m naoh to prepare the titrant: i. pump dispenser
Acid-base titrations are a kind of volumetric analysis in which the substance whose concentration is to be identified is reacted with a standard solution of acid or base whose concentration is known. These titrations have a specific end-point at which the acid and base are in stoichiometric amounts, and thus the pH of the solution is neutral (7.0).In an acid-base titration, a basic solution is created at the equivalence point of the acid and base reaction.
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Chlorine may be added to water in a continuous, slug, and/or the ______ method to initially disinfect a pipeline?
a.) Segmented
b.) Tablet
c.) Low dose
d.) Air injection
Chlorine may be added to water in a continuous, c.) Low dose method to initially disinfect a pipeline.
Chlorine can be added in a continuous low dose to maintain disinfection in the pipeline. This method is often used to prevent the growth of bacteria and other microorganisms in the water. Alternatively, a slug method may be used for an initial shock treatment, where a higher concentration of chlorine is added to the pipeline. Tablet or air injection methods may also be used for disinfection, but they are less commonly employed than the continuous or slug methods. Regardless of the method used, it is important to ensure that the chlorine is properly mixed and that the water is adequately monitored to ensure safe levels of chlorine and other content loaded in the water.
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select all the options that correctly relate the line spectrum of hydrogen to the Bohr model of the atom (figure shown)
- a transition to the n=2 orbit from a higher-energy orbit in some cases produces an emission of visible light
- the energy between two orbits [△E] is equal to the energy of the photon emitted or absorbed Ephoton in an electron transition
Both options are correct. Transition to n=2 orbit from higher orbit can produce visible light and Energy difference between orbits (∆E) equals photon energy (Ephoton).
The two choices are right: A progress to the n=2 circle from a higher-energy circle at times delivers a discharge of noticeable light, which is seen as an unearthly line in the hydrogen line range.
The energy distinction between two circles (∆E) is equivalent to the energy of the photon produced or consumed (E_photon) in an electron change. This connection between energy levels and photons is integral to the Bohr model of the iota, and is utilized to make sense of the line range of hydrogen.
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Formaldehyde has the formula CH2O. How many molecules are there in 0.11 g offormaldehyde?A) 6.1 × 10-27 B) 3.7 × 10-3 C) 4.0 D) 2.2 × 1021 E) 6.6 × 1022
The answer is D) 2.2 × 10²¹ molecules.
To solve this problem, we need to use Avogadro's number, which relates the number of molecules in a substance to its mass. First, we need to calculate the molar mass of formaldehyde:
Molar mass of CH2O = (1 x 12.01) + (2 x 1.01) + 16.00 = 30.03 g/mol
Next, we can use the following equation to calculate the number of molecules in 0.11 g of formaldehyde:
Number of molecules = (0.11 g / 30.03 g/mol) x (6.02 x 10²³ molecules/mol) = 2.2 x 10²¹ molecules
Therefore, the answer is D) 2.2 x 10²¹ molecules.
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Describe the following major air pollutants. Include major health problems caused by the pollutantcarbon monoxidenitrogen oxidessulfur dioxideparticulatesozonelead
Exposure to these major air pollutants can have serious health consequences, can cause headaches, dizziness, nausea, and even death at high concentrations.
Carbon monoxide is a toxic gas that is formed by the incomplete combustion of fossil fuels.
Nitrogen oxides are a group of gases that are produced by the burning of fossil fuels, which can lead to respiratory problems, lung damage, and even premature death.
Sulfur dioxide is a gas that is released from burning fossil fuels, and it can cause respiratory problems such as wheezing, coughing, and shortness of breath. Particulates are tiny particles that can be found in the air from natural and human-made sources such as combustion engines, forest fires, and construction sites.
They can cause respiratory and cardiovascular problems when inhaled, including asthma and heart disease. Ozone is a gas that is formed by the reaction of sunlight with pollutants like nitrogen oxides and volatile organic compounds. It can cause chest pain, coughing, and shortness of breath.
Lead is a heavy metal that can be found in the air from industrial processes, leaded gasoline, and old paint. It can lead to developmental delays in children and cognitive issues in adults.
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Which of the following describes how blood helps to maintain homeostasis by working with the immune system?
Homeostasis is the process by which a body is able to adapt to different conditions and keep the body in relatively stable internal conditions at all times.
During homeostasis, blood helps regulate the body temperature by eliminating excess heat, maintaining the pH balance of the body, and maintaining the internal osmotic pressure.
The immune system assists in homeostasis by screening and destroying pathogens and helps prevent autoimmunity as well as regulates immune reactions periodically. If the immune system fails to do these processes, then it may result in the appearance of cancer.
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Answer:
c
Explanation: