You need to plate out tube with sample original concentration is 5.1 × 10⁹ CFU / ml to yield a countable plate.
The starting dosage is5.1 × 10⁹ × 10⁻¹ = 5.1 × 10⁸ CFU/ml
CFU levels must range from 10 to 200 per milliliter in order to produce a countable plate.
Let's make 0.1 ml into 1 ml by dilution.
As a result, the concentration is reduced to5.1 × 10⁹ × 10⁻¹ = 5.1 × 10⁸ CFU/ml
It can be lowered to 5.1 × 10¹to reduce the concentration between 10 and 200.
5.1 × 10¹ CFU/ml is the final concentration.
Initial concentration: 5.1 × 10⁹ CFU/ml
Sample volume is 5.1 × 10¹ CFU = 5.1 × 10¹ CFU × (1 ml / 5.1 × 10⁹ CFU)
= 1.0 × 10⁻⁸ ml
This is the volume must be consumed to obtain 51 CFU of countable value.
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which solution has the lowest concentration of hydrogen ions [h ]? vinegar, ph 3 banana, ph 5 toothpaste, ph 8 laundry detergent, ph 10
Option d is correct. Laundry detergent pH 10 having the lowest concentration of hydrogen ions. The concentration of hydrogen ions at pH 10 will be 0.001.
Acidity and alkalinity are measured with a logarithmic scale Known as pH.
An acid is that substance which donates hydrogen ions. Because of this, when an acid will be dissolved in water, the balance between hydrogen ions and hydroxide ions is shifted. Now there are more hydrogen ions than to the hydroxide ions in the solution. This kind of solution will be acidic.
A base is that substance which will accepts hydrogen ions. When a base will be dissolved in water, the balance between the hydrogen ions and hydroxide ions shifts the opposite way. Because the base will "soaks up" hydrogen ions, the result is a solution with more hydroxide ions than to the H+ ions. This kind of solution is alkaline.
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10.
Potash is a common name for potassium carbonate. Originally, potash was obtained by
adding water to the ash produced from the burning of wood, filtering and evaporating the
filtrate.
(a)
Meirion was asked to find the percentage of potash that could be obtained from some
wood ash. He added water to a known mass of wood ash, stirred the mixture and then
filtered the product. The filtrate was then made up to a volume of 250 cm³.
(i) State why the mixture was stirred.
[1]
E
(ii) Describe, giving full practical details, how the volume was made up to exactly
[4]
250 cm³.
Answer:
(a) (i) The mixture was stirred to ensure that the wood ash was completely mixed with the water, allowing for the maximum amount of potash to be dissolved and filtered out of the ash.
(ii) To make the volume up to exactly 250 cm³, Meirion can use a graduated cylinder or a measuring cylinder to measure the volume of the filtrate. He can then add distilled water to the filtrate until the total volume reaches 250 cm³. He can use a dropper or a pipette to add small amounts of water and stir the mixture until the desired volume is reached. He can also measure the volume with a graduated cylinder or a measuring cylinder. Finally, he can check the final volume of the solution again to make sure that the volume is exactly 250 cm³.
explain why the particle size of the perovskite increases when synthesised at a higher temperature and predict with explanation how the particle size would change upon increasing the reaction time
The particle size of perovskite increases when synthesized at a higher temperature because high temperature promotes faster nucleation and growth of the perovskite crystals.
The high temperature provides more thermal energy for the reaction, which causes the molecules to diffuse more quickly and collide more frequently, leading to an increased rate of nucleation and crystal growth.
If the reaction time is increased, the particle size may increase or remain unchanged, depending on the specific synthesis conditions. If the reaction conditions are such that the rate of crystal growth is limited by the availability of reactants, then increasing the reaction time will result in larger particle size. On the other hand, if the reaction conditions are such that the rate of crystal growth is limited by other factors, such as the rate of surface transport of reactants or the rate of crystal-crystal interactions, then increasing the reaction time may not result in any significant change in particle size.
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If triangle abc is isosceles where an=bc and m
△ABC is an isosceles right-angled triangle If triangle abc is isosceles where Mole an=bc and m
What is mole and its formula?One mole of any substance is equal to the value of 6.023 x 1023. It can be used to measure the products obtained from the chemical reaction. The unit is denoted by mol. The formula for the number of moles formula is expressed as. Number of Moles = Mass of substance / Mass of one mole.
What is mole explained simply?The mole is an amount unit similar to familiar units like pair, dozen, gross, etc. It provides a specific measure of the number of atoms or molecules in a bulk sample of matter. A mole is defined as the amount of substance containing the same number of discrete entitie
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if an individual performed 5,000 foot pounds of work in 1 minute, how many kilojoules of work were accomplished?
If an individual performed 5,000 foot-pounds of work in 1 minute, the amount of work accomplished would be 6.78 kilojoules (kJ).
This can be calculated by dividing the foot-pounds by 737.56, which is the number of foot-pounds in 1 kilojoule.
When it comes to calculating the amount of work done, it is important to use the equation W = Fd, which stands for work equals force multiplied by distance.
This equation can be used to calculate the amount of work done, and then the amount of energy transferred, when a force is applied over a certain distance. In the case of the individual performing 5,000 foot-pounds of work in one minute, the amount of work done can be calculated by multiplying 5,000 foot-pounds by the number of feet in one minute, which is 60. This will give a result of 300,000 foot-pounds of work done in one minute. To convert this to kilojoules (kJ), the result is then divided by 737.56, which is the number of foot-pounds in one kilojoule. This will give the result of 6.78 kilojoules (kJ) of work done in one minute.
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anhydrous sodium sulfate is used at the end of the procedure to dry the product. what are the intermolecular forces at play that allow the sodium sulfate to dry the product?
The intermolecular forces at play that allow the sodium sulfate to dry the product are hydrogen bonding and van der Waals forces.
When anhydrous sodium sulfate is added to a solution, it readily absorbs water molecules by forming hydrogen bonds with them. This removal of water molecules results in a reduction in the number of water molecules present in the mixture and thus, the product is dried.
Additionally, van der Waals forces also play a role in the drying process. Van der Waals forces are weak, non-covalent forces that arise due to the fluctuation of electron density in a molecule. They are responsible for the interaction between molecules, including the attraction between sodium sulfate and water molecules.
The combined effect of hydrogen bonding and van der Waals forces results in the absorption of water by the anhydrous sodium sulfate, leading to the drying of the product.
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what is the molar mass of kmno4? (mass has been rounded to 1 decimal place) k = 39.1 g mn = 55 g o = 16 g
The molar mass of KMNO₄ is 158.04 g mol-1.
Potassium permanganate is an inorganic compound having chemical formula KMnO₄. It is a purplish-black crystalline salt, which dissolves in water as K⁺ and MnO⁻
4, an intensely pink to purple solution.
Molar mass: The mass of the 1 mole of a substance is called as its molar mass.
Molar mass = Atomic mass of element × number of atoms given in subscript
Molar mass of potassium permanganate: Formula for potassium permanganate will be KMNO₄
Molar mass of KMNO₄ = Atomic mass of K + Atomic mass of Mn + (4 × Atomic mass of O)
= [ 39.10 g mol-1 + 54.94 g mol-1 + (4 × 16.00)g mol-1]
= 158.04 g mol-1
Hence, the molar mass of KMNO₄ is 158.04 g mol-1.
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metals outnumber nonmetals on the periodic table because most of the elements a) are close to having a full octet b) have 1 to 2 valence electrons c) have high ionization energy d) have high electronegativity
The correct answer is option (b): metals outnumber nonmetals on the periodic table because most elements have 1 to 2 valence electrons.
Valence electrons are the outermost electrons of an atom and are involved in chemical bonding. Since metals have fewer valence electrons than nonmetals, they tend to outnumber nonmetals on the periodic table.
This is because metals are more likely to form cations (positively charged ions) when they release their valence electrons, while nonmetals are more likely to form anions (negatively charged ions) when they accept additional valence electrons. This overall imbalance of positive and negative charges leads to metal atoms outnumbering nonmetals on the periodic table.
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what body processes are affected by altered cellular and tissue adaptation?
Altered cellular and tissue adaptation can impact various bodily processes. Altered cellular and tissue adaptation affects multiple bodily processes such as cellular metabolism, growth, repair, and cellular signaling pathways.
Cellular metabolism involves the transfer of energy and the conversion of nutrients into energy and waste products. When cellular adaptation is altered, it can impact the metabolic processes and the balance of energy.
Growth and repair processes are crucial for maintaining the health and functioning of tissues. These processes are regulated by hormones, growth factors, and signaling pathways that are influenced by cellular adaptation. Altered cellular adaptation can disrupt these processes and lead to cellular dysfunction, tissue damage, and pathological conditions such as cancer.
Cellular signaling pathways are critical for the communication and coordination of cells and tissues. They regulate various physiological processes such as cell division, cell migration, and gene expression. Altered cellular adaptation can disrupt signaling pathways and cause cellular dysfunction and disease.
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what orbitals are accountable to the law of octaves
The orbitals are accountable to the law of octaves are: 1s 2s 2p 2p 3s 3p 3d 4s 4p 4d 5s 5p 4f 5d 6s 6p 5f 6d 7s .
The law of octaves introduced by the English chemist named J.A.R Newlands. According to it if we arranged the chemical elements in the periodic table according to their atomic mass then those that have the similar physical and the chemical properties will occur after the each interval of the seven elements.
The last element that is known was the thorium with the atomic mass of 232. Newlands' law of octave was firstly applicable only up to the calcium with atomic mass of 40. Now there are more ninety elements known up to the thorium.
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what mass of the lead (ii) hydroxide (solid) could be collected when 22.5 ml of 0.135 m pb(no3)2 solution reacts with excess sodium hydroxide?
The number of moles of lead hydroxide formed is 0.00304 moles. So the mass of lead hydroxide formed will be 0.733g
The balanced reaction between lead nitrate with sodium hydroxide is as follows.
Pb(NO₃)₂ + 2NaOH ⇒ Pb(OH)₂ + 2NaNO₃
So one mole of lead nitrate reacts with 2 moles of sodium hydroxide to give one mole of lead hydroxide and two moles of sodium nitrate. Since sodium hydroxide is in excess, lead nitrate is the limiting agent.
Here it is given that molarity of solution is 0.135 M.
Molarity = Number of moles/ Volume of solution in litres
0.135 = number of moles/ 0.0225 L
Number of moles = 0.135× 0.0225
= 0.00304 moles
So from 0.00304 moles of lead nitrate 0.00304 moles of lead hydroxide is formed.
Molar mass of lead hydroxide = 241.21 g
Mass = Molar mass × number of moles
=241.21 × 0.00304
= 0. 733 g
So 0.733g of lead hydroxide is produced.
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SOMEONE PLSSSSSSSSSSSSSSSS HELP ME ASAP
photoplankton play an important role in the carbon cycle because
A- photosynthesis by phytoplankton removes carbon from the atmosphere
B- They convert carbon dioxide to methane
C- They eat animals that have stored carbon
The majority of the transfer of carbon dioxide from the atmosphere to the ocean is carried out by phytoplankton.
What is the purpose of phytoplankton?Microscopically small plants called phytoplankton are important components of the marine food chain. Similar to plants on land, phytoplankton use photosynthesis to transform sunlight into energy for survival. They also take in carbon dioxide and release oxygen.The oceanic biological pump removes more carbon dioxide from the atmosphere when there are large phytoplankton blooms, which has a significant impact on climate in two ways. In addition, removing greenhouse gas molecules from the atmosphere reduces the warming impact of CO2 emissions from fossil fuels.The plants (phytoplankton, kelp, and algal plankton) that inhabit the ocean produce oxygen. The process of photosynthesis, which turns carbon dioxide and sunlight into sugars an organism may use for energy, results in the production of oxygen by these plants.To learn more about phytoplankton refer to:
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how do the results obtained for the metal samples compare with 3r (r here is the ideal gas constant)? comment on the differences of your values from 3r, and on any differences between aluminum and iron.
The container should be filled with several hundred particles. From the hold constant menu, pick temperature.
Following are the many R values: R is equal to 0.0821 liter•atm/molK. R is equal to 62.3637 lb/mol K or lb/mmHg/mol K. Atm, Torr, and mmHg are the different pressure units used here. Liters (L), Kelvin (K), and moles (mol) are the units for volume, temperature, and moles, respectively. When different pressures are applied and stated in various units, the value of R changes. offered here, Speed Vo, R - Distance from the Earth's centre. Force applied to the satellite, tangential speed, or vT. Gravitational force (Fg) is equal to centripetal force for satellites (Fc), Fc = Fo = Fg. GM = (v0)²R..................... (1) (1). Considering that satellite R = 3R.
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why are water's chemical and physical properties so unique?
The specific heat, thermal conductivity, surface tension, dipole moment, and other properties of water are higher than those of other liquids. These makes the physical properties so unique
Water molecules have a bent overall structure, partial positive charges on the hydrogens, partial negative charges on the oxygen, and are polar. This is due to the fact that oxygen is more electronegative than hydrogen, making it more effective in drawing electrons. Excellent solvents include water. An oxygen (O) atom and two hydrogen (H) atoms make up water. Because it is bipolar, with a little positive charge on one side (where the hydrogen atoms are connected) and a slightly negative charge on the other, it is special (just oxygen). The distinctive physical characteristics of water, such as its high heat of vaporization, high specific heat, and almost universal solvent qualities, are also a result of hydrogen bonding.
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based on vsepr theory, what is the approximate cˆnˆh bond angle in glycine? explain.
In glycine, the approximate CˆNˆH bond angle is 109.5 degrees. This is so because it is an amino acid made up of two hydrogen atoms on either side of a core carbon atom, a nitrogen atom, and a sulphur atom.
The carbon and nitrogen atoms form a linear geometry in accordance with VSEPR theory, and the two hydrogen atoms at either end of the line form two angles. Since the nitrogen and carbon atoms are in the same group, they repel one another equally, resulting in a 109.5 degree bond angle. Since it is smaller than the angle of a conventional tetrahedron, which would be 109.5 degrees, this angle is referred to as a "bent" angle.
As a result of the attraction between the two electronegative atoms, the CˆNˆH bond angle in glycine is a little shorter than the typical tetrahedral angle.
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C3H8 + 5 O2 = 3 CO2 + 4 H20
1) How many moles of O2 are necessary to react completely with 12.0 moles of C3H8
2) How many moles of H2O will be formed from 13.5 moles of O2
3) If 1.35 moles of CO2 are produced, how many moles of H2O are produced
1. In the balanced equation, 1 mole of C3H8 reacts with 5 moles of O2 to produce 3 moles of CO2 and 4 moles of H2O. Therefore, if we have 12.0 moles of C3H8, we need 5*12.0 = 60.0 moles of O2 to react completely.
2. In the balanced equation, 1 mole of C3H8 reacts with 5 moles of O2 to produce 3 moles of CO2 and 4 moles of H2O. Therefore, if we have 13.5 moles of O2, we would produce 4*13.5 = 54.0 moles of H2O
3. In the balanced equation, 1 mole of C3H8 reacts with 5 moles of O2 to produce 3 moles of CO2 and 4 moles of H2O. If we know that we have 1.35 moles of CO2, we can use this relationship to find the amount of H2O produced. Since the ratio of CO2 to H2O is 3:4, for every 3 moles of CO2 produced, we would produce 4 moles of H2O. Therefore, if 1.35 moles of CO2 are produced, we can divide 1.35 by 3 to find the number of moles of H2O produced, which is 1.35/3 = 0.45 moles of H2O.
5. bromothymol blue was the indicator used in the experiment. why was the indicator necessary; in other words, what did it indicate? (3 pts)
Bromothymol blue was used to indicate the pH of the solution.
Bromothymol blue is a pH indicator, which means it changes color in response to changes in the pH of the solution. In particular, bromothymol blue is yellow in basic solutions (pH 7.6 - 6.0) and blue in acidic solutions (pH 6.0 - 7.6).
In the experiment, the presence of bromothymol blue allowed the researchers to observe changes in the pH of the solution, and to make more accurate measurements of the pH than would be possible without the indicator. This information was likely used to track the progress of the reaction or to monitor the pH of the solution at different stages of the experiment. By using bromothymol blue, the researchers were able to gain a better understanding of the conditions of the reaction and to make more informed conclusions about the results.
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4. calculate the concentration of a solution prepared by the addition of 20 ml 0.1 m nacl to 180 ml of water.
The concentration of the solution prepared by the addition of 20 ml 0.1 M sodium chloride to 180 ml of water is 0.01M. It is calculated using dilution equation.
The Dilution of a solution is defined as the process of decreasing the concentration of a solute in a solution by mixing with more solvent like adding more water to the solution. It means to add more solvent without the addition of more solute. Dilution of the solution decreases the concentration of the solute in the solution. By using the dilution equation,
C1 V1 = C2 V2
The solution prepared by the addition of 20 ml 0.1 m nacl to 180 ml of water.
C1 = 0.1M
V1 = 20 ml
V2 = 200 ml
C2 = C1 V1 / V2
= 0.1 ML * 20 ML / 200 ML
= 0.01M
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an unknown compound contains only c , h , and o . combustion of 8.50 g of this compound produced 19.3 g co2 and 7.91 g h2o . what is the empirical formula of the unknown compound? insert subscripts as needed.\
The empirical formula of the unknown compound is CH2O.
To calculate the empirical formula of the compound, the number of moles of each element in the compound must be calculated. The moles of Carbon (C) can be determined by dividing the mass of CO2 (19.3 g) by the molar mass of CO2 (44 g/mol). This yields 0.437 moles of Carbon.
The moles of Hydrogen (H) can be determined by dividing the mass of H2O (7.91 g) by the molar mass of H2O (18 g/mol). This yields 0.442 moles of Hydrogen.
The moles of Oxygen (O) can be determined by subtracting the moles of Carbon and Hydrogen from the total number of moles in the compound, which is determined by dividing the mass of the compound (8.50 g) by its molar mass (we can assume the molar mass of the compound is equal to the sum of the molar masses of its elements).
This yields 0.125 moles of Oxygen. Once the moles of each element are determined, they can be divided by the smallest number of moles of the three elements (in this case, 0.125 moles of Oxygen) to get the ratio of each element in the compound. This yields a ratio of 3.5 Carbon, 4.4 Hydrogen, and 1 Oxygen. This ratio can be simplified to a whole number ratio of 4 Carbon, 5 Hydrogen, and 1 Oxygen, which is equivalent to the molecular formula CH2O.
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17. Silver chromate, Ag2CrO4, is insoluble. It forms a red precipitate.
2AgNO3(aq) + Na2CrO4(aq) -> Ag2CrO4(s) + 2NaNO3(aq)
a. Determine the concentration of all ions remaining in the solution.
The concentration of the ions in the solution cannot be determined from the information provided. To determine the concentration, additional information, such as the initial concentrations of the reactants and any reaction conditions, would be needed.
What is Silver chromate?Generally, Silver chromate (Ag2CrO4) is a chemical compound made of silver, chromium, and oxygen ions. It is an insoluble substance that forms a red precipitate in aqueous solution.
From the information that has been supplied, it is not possible to estimate the amount of ions that are present in the solution.
Additional information, such as the beginning concentrations of the reactants and any circumstances that may be present throughout the reaction, would be required in order to calculate the concentration.
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The diameter of the nucleus is about 12 fm. A simple model of the nucleus is that protons and neutrons are confined within a one-dimensional box of length 12 fm.A) What is the first energy level, in MeV, for a proton in such a box?B) What is the second energy level, in MeV, for a proton in such a box?C) What is the third energy level, in MeV, for a proton in such a box?
A) The first energy level, in the MeV is
B) The second energy level, in the MeV is
C) The third energy level, in the MeV, is
The diameter of nucleus = 12 fm = 12 × 10⁻¹⁵ m
The length = 12 × 10⁻¹⁵ m
E = ( n² h² ) / 8 m l²
A) E₁ = (1)₂ ( 6.626 × 10⁻³⁴ J.s )² / 8 ( 1.672 × 10⁻²⁷ kg × )( 12 × 10⁻¹⁵ m)²
The first energy level, E₁ = 1.41 MeV
B) E₂ = ( 2)² ( 6.626 × 10⁻³⁴ J.s )² / 8 ( 1.672 × 10⁻²⁷ kg × )( 12 × 10⁻¹⁵ m)²
The second energy level = 5.68 MeV
C) E₃ = (3)² ( 6.626 × 10⁻³⁴ J.s )² / 8 ( 1.672 × 10⁻²⁷ kg × )( 12 × 10⁻¹⁵ m)²
The third energy level = 12.7 MeV
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Please help me with this Chemistry homework! i will give 15 points :D
Answer:
1. one particle
2. to represent different states of matter and/or different particles or elements
3. multiple particles or an element with multiple particles
4. the grey bricks would connect to the black one in a triangle shaped way
5. the white bricks would connect with the grey one in the middle with the white ones on both sides of it
extension
1. when you freeze water it becomes ice and vice versa- when you melt it it becomes water
2. it is the same identity either way- ice is only frozen water and when you melt it it will become that once again
I really hope this helps because this was really confusing!
2.48925 C : 3.9901 H : 1.000 0 The ratio does not give whole numbers, so we have to use a multiplier. What can we multiply each element by in order to have them all reach the smallest whole number?
multiply by
[ ? ]
Hint: The multiplier should be a whole number.
20,000 is the correct answer
What is empirical formula ?
The empirical formula of a chemical compound is the simplest ratio of the number of atoms of each element present in a compound. It represents the smallest whole number ratio of the elements in a compound and gives an indication of the relative proportions of the elements. The empirical formula is not necessarily the same as the molecular formula, which represents the actual number of atoms in a molecule. The molecular formula may be a multiple of the empirical formula and can be determined by analyzing the compound's molecular weight.
Multiply each by 20,000, then we have
C: 2.48925 x 20,000 = 49,785
H: 3.9901 x 20,000 = 79,802
O: 1.000 x 20,000 = 20,000
Multiply each element by in order to have them all reach the smallest whole number will be 20,000.
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Answer: The answer is 2
Explanation:
augmentin 10mg/kg po every 12 hours is ordered. when augmentin is reconstiuted it yeilds 125mg/ml. the child weights 25kg. how many ml will you give
Answer:
To calculate the amount of Augmentin to give, you can use the following formula:
Dose (mg) = weight (kg) x dosage (mg/kg)
In this case, the dosage is 10mg/kg and the child's weight is 25kg, so:
Dose (mg) = 25 x 10 = 250mg
We know that the reconstituted Augmentin yields 125mg/ml, to find the amount in ml we divide the dose by the concentration:
250mg / 125mg/ml = 2 ml
So you will give 2ml of Augmentin to the child every 12 hours.
Sodium chloride is a soluble salt that can be made by mixing sodium hydroxide
with which acid? Give the name, not the formula.
By neutralizing hydrochloric acid with sodium hydroxide, sodium chloride (NaCl) is produced.
What acid reacts with sodium hydroxide and sodium chloride?The remaining acid and alkali molecules combine to create a new chemical, which also contains water. We call this a salt.An acid and an alkali combine to make a salt in chemistry. However, in common usage, the term solely applies to sodium chloride, sometimes known as table salt.Sodium hydroxide neutralizes hydrochloric acid, resulting in the formation of sodium chloride (NaCl).When the water evaporates, only the salt is left.As was previously explained, heartburn develops when stomach acid reflux denatures the tissue (protein) lining the oesophagus.Antacids are medications that treat heartburn by neutralizing stomach acid and relieving oesophagitis.MgOH2, an alkali magnesium hydroxide, is a typical component of antacids.To Learn more About hydrochloric acid Refer To:
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A gaseous mixture of methane , ethane and propane has partial pressures respectively of 95 kPa,105 kPa and 50 kPa. What is the mass percentage of methane in the mixture?
The mass percentage of methane in the gaseous mixture of methane, ethane, and propane is approximately 43.5%.
The mass percentage of a gas in a mixture can be calculated by dividing the mass of the gas by the total mass of the mixture and then multiplying by 100%.
To calculate the mass of each gas, the ideal gas law, PV = nRT, can be used. Here, P is the partial pressure of the gas, V is the volume of the mixture, n is the number of moles of the gas, R is the ideal gas constant, and T is the temperature.
Assuming a constant temperature and volume, the number of moles of each gas can be determined from the partial pressures of the gases:
n_methane = (95 kPa * V) / (R * T)
n_ethane = (105 kPa * V) / (R * T)
n_propane = (50 kPa * V) / (R * T)
The mass of each gas can be calculated using the molar mass of the gas:
m_methane = n_methane * M_methane
m_ethane = n_ethane * M_ethane
m_propane = n_propane * M_propane
Where M is the molar mass of the gas. The molar mass of methane is 16.04 g/mol, the molar mass of ethane is 30.07 g/mol, and the molar mass of propane is 44.10 g/mol.
The total mass of the mixture can be calculated as the sum of the masses of each gas:
total mass = m_methane + m_ethane + m_propane
Finally, the mass percentage of methane in the mixture can be calculated as:
mass percentage of methane = (m_methane / total mass) * 100%
Approximating the values, the mass percentage of methane in the gaseous mixture of methane, ethane, and propane is approximately 43.5%.
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a rigid, 2.50 l bottle contains 0.458 mol he. the pressure of the gas inside the bottle is 1.83 atm. if 0.713 mol ar is added to the bottle and the pressure increases to 2.05 atm, what is the change in temperature of the gas mixture? use the correct number of significant digits.
The change in temperature of the gas mixture is -68.4 K [1][2]. This can be calculated using the ideal gas law equation, PV=nRT, where P is the pressure, V is the volume, n is the number of moles, R is the universal gas constant, and T is the temperature.
By rearranging the equation, we can calculate the change in temperature as follows:
T2 = (n1RT1 + n2RT2)/(n1 + n2*R)Where T1 is the initial temperature and n1 and n2 are the number of moles of He and Ar, respectively. Substituting the given values, we get:
T2 = (0.4588.314293 + 0.7138.314T2)/(0.458 + 0.713*8.314)Solving for T2, we get T2 = -68.4 K.
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what is the original molarity of an aqueous solution of ammonia (nh3) whose ph is 11.24 at 25°c? (kb for nh3 = 1.8 × 10−5)
The original molarity of the aqueous solution of ammonia (NH₃) whose pH is 11.24 at the temperature 25°C is 0.172 M.
The pH of the solution = 11.24
The temperature = 25°C
The value Kb = 1.8 × 10⁻⁵
pH = - log [H⁺]
[H⁺] = 10^-11.24
[OH⁻] = Kw / [H⁺]
Where,
The value of Kw = 10⁻¹⁴
[OH⁻] = ( 10⁻¹⁴ / 10⁻¹¹°²⁴ ) M
[OH⁻] = 10^-2.76 M
Kb = [NH₄⁺] [OH⁻] / [NH₄OH]
[NH₄OH] = (1/1.8 ) × 0.31
[NH₄OH] = 0.172 M
Thus, the molarity of the aqueous solution of ammonia is 0.172 with the pH of 11.24.
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how to convert ethene to acetylene...
Acetylene (C2H2) can be synthesized from ethene (C2H4) through a reaction called "partial oxidation". The reaction can be performed by passing ethene and air over a hot metal catalyst, typically made of copper or iron. The reaction is exothermic and generates heat, which helps to maintain the reaction temperature. The following is the equation for the conversion of ethene to acetylene:
C2H4 + O2 -> C2H2 + H2O
In this reaction, ethene reacts with oxygen from air to form acetylene and water. The reaction is usually performed in a controlled environment, such as a reactor, to ensure that the reaction conditions are suitable for optimal conversion of ethene to acetylene. The acetylene produced is then typically purified, compressed, and stored for later use as a fuel or chemical feedstock.
How would the temperature of a gas change when its volume is decreasing at a constant pressure?
Answer: See Explanation
Explanation:
When the volume of a gas is decreasing at a constant pressure, the temperature of the gas will increase. This is because of the relationship between the pressure, volume, and temperature of a gas, which is described by the Ideal Gas Law (PV = nRT), where P is pressure, V is volume, n is the number of moles of gas, R is the ideal gas constant, and T is the temperature.
In this scenario, the pressure is constant, and the volume is decreasing, so the product PV must remain constant in order to maintain the balance of the equation. Therefore, the only way to balance this equation is to increase the temperature T, in order to make the product PV remains constant.
This relationship is also described by Gay-Lussac's Law, which states that the pressure of a fixed mass of a gas is directly proportional to its absolute temperature at a constant volume. This means that if the volume of the gas is decreasing, the pressure will remain constant, the only way to balance the equation is to increase the temperature.
So in conclusion, as the volume of a gas decreases at constant pressure, the temperature of the gas will increase.
