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A mixture is a portion of matter made up of two or more substances called constituents. Mixtures are the product of the mechanical joining of substances without change in chemical nature, and therefore, each constituent retains its properties.
the option 4
Related Questions
what is the symbiotic relationship of bighorn sheep and worms
Answers
Answer:
Lungworms live in the lungs of bighorn sheep causing them to be sick, or even die.
Explanation:
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Solve the following problem with the correct number of significant figures.
5.31 cm + 8.4 cm + 7.932 cm
Multiple choice question.
A)
22 cm
B)
21.6 cm
C)
21.642 cm
D)
21.64 cm
Answers
Need Help Solving It.
Answers
What is the pH of a solution if the pOH is 2.96
Answers
The pH of a solution if the pOH is 2.96 will be 11.04. As the sum of the pH and pOH is always 14.
A pH can be regarded as a scale that is used to measure acids and bases. The scale measures from 0 to 14. A litmus paper is used to indicate if the substance is an acid or a base and then the color of the litmus paper is used to match the numbers on the pH scale in order to indicate what kind of substance is it. The term PH is widely used in the fields of biology, chemistry, and agronomy. In chemistry, it depicts the hydrogen potentials. It shows us the concentration of hydrogen ions in a solution.To know more about, pH levels, visit :
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describe what you would expect to see in your chromatogram if a detection wavelength of 650 nm was used instead of 450 nm
Answers
Using the concepts of chromatogram, we got much fewer pigments would show prominent peaks if detection wavelength changed.
At 450 nm, all the possible pigments observed in the chromatogram had absorbance peaks within in range greater than or equal to 30 nm or less 450nm, so these peaks will be easily detected. However, only chlorophyll a and chlorophyll b have such peaks close to 650 nm, so it would be very difficult to detect these other pigments at that wavelength which is so far from their absorption peaks1. Most Likely, the only peaks that will show up on the chromatogram are chlorophylls a and b and the dead time at the beginning.
Hence, if a detection wavelength of 650nm was used instead of 450nm then we will get much fewer pigments and it will show prominent peaks.
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If 0.40 mole of H2 and 0.15 mole of O2 were to react as completely as possible to produce H2O, what mass of reactant would remain
Answers
The remaining mass of hydrogen that is present in the reaction is 0.20 grams.
The balanced chemical reaction can be depicted as follows:
2H2+O2---->2H2O
1 mole of Oxygen reacts with 2 moles of Hydrogen in order to produce two moles of water i.e., H2O.
0.15 moles of O2 reacts with 2 * 0.15 = 0.30 moles of H2
The moles of H2 are given i.e., 0.40 moles.
So remaining = 0.40 moles - 0.30 moles = 0.10 moles
Thus, the mass of H2 can be calculated by multiplying the number of moles with the molar mass that is expressed as follows:
Mass = moles * molar mass
Molar mass of H2= 2 g/mol
Mass of H2 remained in the reaction = 0.10 moles * 2 g/mole = 0.20 grams.
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The side of the ladder are made up of alternating ____ and ____ molecules the steps of the ladder are made up of _____ held together by hydrogrn
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The side of the ladder are made up of alternating sugar and phosphate molecules the steps of the ladder are made up of bases held together by hydrogen bonds.
The fundamental unit of DNA is referred to as a nucleotide. One sugar molecule, one phosphate molecule, and one of the four bases make up a nucleotide. DNA's nucleotides align to form two lengthy backbones that resemble a ladder's handrails in the shape of sugar and phosphate molecules. Between the sugar molecules on the two handrails, two bases combine to form the ladder's rungs. The "rungs" between the phosphate molecules are absent. This was significant to Watson and Crick since it enabled them to understand the formation of the double helix.
James Watson and Francis Crick discovered the DNA structure in 1953. A double helix, often known as a twisted ladder, is the structure. Sugar and phosphate molecules alternately make up the sides of the ladder. Hydrogen bonds serve as a flimsy means of holding the two sides of the DNA ladder together.
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6. What is the mass of the object if the net force acting on it was 356 N and the acceleration rate
was 4 m/s/s2
Answers
The mass of an object with a net force of 356N and an acceleration rate of 4m/s² is 89kg.
How to calculate mass?The mass of an object can be calculated using the following formula:
F = ma
Where;
F = force (N)m = mass (kg)a = acceleration (m/s²)m = F/a
m = 356/4
m = 89kg
Therefore, the mass of an object with a net force of 356N and an acceleration rate of 4m/s² is 89kg.
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ammonia is produced at high temperatures and under great pressure in a tank passing a mixture of nitrogen snd hydrogen over an iron catalyst the reaction is represented by this equation N2(g)+3h2(g)->2nh3(g) if the total pressure of nitrogen and hydrogen in the tank before the reaction is4200 kPa, what is the partial pressure of the nitrogen gas? [assume there would be no excess reagent if the reaction went to completion.]
1400 kPa
3150kPa
2100 KPa
1050 kPa
Answers
Answer:
The answer is 1050
:
Partial pressure of nitrogen in the mixture is calculated as 1050 kPa.
What is partial pressure?The pressure exerted by a (specified) component in a mixture of gases is called partial pressure.
The reaction N2(g) + 3H2(g) -> 2NH3(g) shows that one molecule of nitrogen reacts with three molecules of hydrogen to produce two molecules of ammonia. This means that the ratio of moles of nitrogen to moles of hydrogen in the reaction is 1:3.
X(N2) = (moles of N2) / (total moles of gas)
As the ratio of moles of nitrogen to moles of hydrogen in the reaction is 1:3, we can use the mole fraction of nitrogen to determine the mole fraction of hydrogen:
X(H2) = 3 * X(N2)
moles of gas = (total pressure) / (gas constant * temperature)
where gas constant = 8.31 J/mol*K and temperature is in kelvin.
moles of N2 = X(N2) * moles of gas
so, partial pressure of N2 = X(N2) * total pressure
X(N2) = moles of N2 / moles of gas = 1 / (1 + 3) = 0.25
X(H2) = 3 * X(N2) = 0.75
moles of gas = (4200 kPa) / (8.31 J/mol*K * 298 K) = 1.789 mol
moles of N2 = X(N2) * moles of gas = 0.25 * 1.789 mol = 0.447 mol
partial pressure of N2 = X(N2) * total pressure = 0.25 * 4200 kPa = 1050 kPa
Therefore, the partial pressure of nitrogen in the mixture is 1050 kPa.
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Which of these is an example of how engineers have contributed to society?
A. Our current understanding of viruses
B. Nomadic tribes traveling in search of food to hunt and gather
C. The theoretical mathematics describing the orbits of planets
around the sun
D. The seven-mile bridge that spans across the Gulf of Mexico to
connect two cities of the Florida Keys
Answers
An example of how engineers have contributed to society is option D. The seven-mile bridge that spans across the Gulf of Mexico to connect two cities of the Florida Keys.
It is an example of how engineers have contributed to society. Engineers played a crucial role in designing, planning, and constructing the bridge, which provides an essential transportation link between the two cities.
The bridge enables efficient and safe travel, connecting communities, promoting economic development, and improving accessibility for residents and visitors. Engineering expertise is necessary to address various challenges such as designing a structure capable of withstanding environmental conditions, ensuring structural integrity, and incorporating appropriate safety measures.
This example showcases how engineers contribute to society by creating infrastructure that enhances connectivity and supports the growth and well-being of communities. The correct answer is option d.
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Which substance is the oxidizing agent in the reaction below? Pb + PbO2 + 2H2SO4 → 2PbSO4 + 2H2O A.Pb B.PbSO4
C. H20
D. H2SO4 E.PbO2
Answers
The substance that is the oxidizing agent in the reaction is E.\(PbO2\)
A chemical species known as an oxidizing agent has a propensity to oxidise other compounds. This indicates that it causes a material to become more oxidised by causing it to lose electrons. Normal oxidising agents live in their most oxidized forms and have a significant propensity to pick up electrons and proceed through reduction. Strongly electron-affine ions, atoms, and molecules are regarded as effective oxidizers. The power of oxidation increases with increasing electron affinity.
Pb is the chemical that undergoes a reduction in the process, changing its oxidation state from 0 to +2 in the formation of \(PbSO4\). The oxidising agent is the chemical that results in the reduction of Pb. \(PbO2\) serves as the oxidising agent in this situation because it contributes oxygen atoms to the oxidation process.
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In which list are the elements arranged in order of increasing atomic mass?
a) Cl, K, Ar
b) Fe, Co, Ni
c) Te, I, Xe
d) Ne, F, Na
Answers
Answer:
aswer is A
Explanation:
because the CL,K,AR is correct since it is order right
when a polypeptide is being assembled, the bond that forms between a newly added amino acid and the previous amino acid in the chain is this type of bond.peptide terminal phosphodiester hydrophobic hydrogen
Answers
When a polypeptide is being assembled, the bond that forms between a newly added amino acid and the previous amino acid in the chain is a peptide bond.
During protein synthesis, amino acids are linked together to form a polypeptide chain. The bond that forms between the carboxyl group of one amino acid and the amino group of another amino acid is called a peptide bond. This bond is formed through a dehydration synthesis reaction, also known as a condensation reaction.
In a dehydration synthesis reaction, a water molecule is removed as the peptide bond forms between the amino acids. The carboxyl group of one amino acid reacts with the amino group of another amino acid, resulting in the formation of a peptide bond and the release of a water molecule.
The peptide bond is a covalent bond and it forms a strong linkage between the adjacent amino acids in the polypeptide chain. It is responsible for the linear arrangement of amino acids in proteins. The amino acid sequence, determined by the order of peptide bonds, plays a crucial role in determining the protein's structure and function.
In summary, the bond that forms between a newly added amino acid and the previous amino acid in a polypeptide chain is a peptide bond, which is formed through a dehydration synthesis reaction.
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as the temperature of a gas decreases is volume
Answers
Answer:
it's volume also decrease
a dirty pipette which consistently causes your volume measurements to be off by 0.01 ml would be an example of a(n) error
Answers
A dirty pipette that consistently causes volume measurements to be off by 0.01 ml would be an example of a systematic error, which can be minimized or eliminated by ensuring proper calibration and maintenance of equipment, as well as accurate and consistent measurement techniques.
A dirty pipette that consistently causes your volume measurements to be off by 0.01 ml would be an example of a systematic error. Systematic error is a type of error in which the measured values are consistently offset from the true values by a fixed amount in the same direction.
It is caused by a flaw in the experimental design or equipment, such as an improperly calibrated instrument, malfunctioning equipment, or poor measurement techniques.Systematic errors can be minimized by ensuring that equipment is properly calibrated and maintained, and that measurement techniques are accurate and consistent. It is important to identify and correct systematic errors in order to obtain accurate and reliable data.
In the case of a dirty pipette, the error can be eliminated by thoroughly cleaning the pipette and ensuring that it is properly calibrated before use. If the pipette is damaged or malfunctioning, it may need to be repaired or replaced to eliminate the systematic error.
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Given this reaction 2KClO3 → 2KCl + 3O2. How many particles of O2 are produced for 4 moles of KClO3?
A. 3.61 x 10^24 particles
B. 6.1 x 10^23 particles
C. 6.02 x 10^23 particles
D. 1.61 x 10^24 particles
Answers
According to stoichiometry and concept of Avogadro's number there are 3.61×10²⁴ particles for 4 moles of KClO₃.
As 2 moles of potassium chlorate gives 3 moles of oxygen , thus 4 moles of potassium chlorate will give 4×3/2=6 moles , 6 moles have 6×6.023×10²³=3.61×10²⁴ particles.
Thus, there are 3.61×10²⁴ particles for 4 moles of KClO₃.
What is stoichiometry?
It involves figuring out how much of each element or molecule there are in a chemical process. The laws of conservation of mass and combining weights and volumes serve as the foundation for the linked relations.In quantitative analysis, stoichiometry is used to determine the concentrations of the compounds contained in the sample.To know more about stoichiometry, click the link given below:
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The number of waves that pass a given point in a certain amount of
time is the waves...
Answers
Answer:
100
Explanation:
nsvcscjkvschssvds
if 39.5 mols of nitrogen react with 19.9 mols of hydrogen, how many mols of ammonia will be produced
Answers
The reaction of 39.5 mols of nitrogen and 19.9 mols of hydrogen will produce 13.27 mols of ammonia.
Determine the balanced chemical equation for the reaction of nitrogen and hydrogen to produce ammonia.
N₂ + 3 H₂ ⇒ 2 NH₃
Based on the balanced chemical equation of the reaction, the mole ratio is 1 mol of nitrogen requires 3 mols of hydrogen to produce 2 mols of ammonia.
If 39.5 mols of nitrogen is to be reacted, then it will require 118.5 mols hydrogen. But the reaction only has 19.9 mols of hydrogen. Hence, hydrogen is the limiting reactant.
Given that 19.9 mols of hydrogen will be reacted, it will require 6.63 mols of nitrogen, thus, producing 13.27 mols of ammonia.
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Sodium and chloride ions readily combine because they have opposite charges.
O True
O False
HURRY!!!
Answers
Answer:
its true i just looked on quizlet
Explanation:
14. How many moles are there in 200 grams of AL
15.How many moles are there in 100 grams of AL2 O3?
16.How many moles does 1 mole of methane CH4 have ?
please show work
Answers
Answer:
14. there are 7.41 moles of Al in 200 grams of Al.
15. there are 0.98 moles of Al2O3 in 100 grams of Al2O3.
16. 1 mole of methane has 5 moles of atoms.
Explanation:
14. To calculate the number of moles in 200 g divide the mass by the molar mass of Al. The molar mass of Al is 26.98 g/mol.
Number of moles = Mass ÷ Molar mass
Number of moles = 200 g ÷ 26.98 g/mol
Number of moles = 7.41 mol
Therefore, there are 7.41 moles of Al in 200 grams of Al.
15. To calculate the number of moles in 100 grams of Al2O3, divide the given mass by the molar mass of Al2O3. The molar mass of Al2O3 is 101.96 g/mol.
Number of moles = Mass ÷ Molar mass
Number of moles = 100 g ÷ 101.96 g/mol
Number of moles = 0.98 mol (rounded to two decimal places)
Therefore, there are 0.98 moles of Al2O3 in 100 grams of Al2O3.
16. One mole of methane, CH4, contains 1 mole of carbon and 4 moles of hydrogen. The total number of moles in 1 mole of methane:
Number of moles = Number of moles of carbon + Number of moles of hydrogen
Number of moles = 1 mole + 4 moles
Number of moles = 5 moles
Therefore, 1 mole of methane contains 5 moles of atoms.
Why is the practice of using a spatula to scoop powder from a bottle discouraged?
Answers
Answer:
it's both impossible and inefficient
Explanation:
think about it, if your spatula can even fit in the bottle will it take out a measured amount of powder? if the spatula has holes in it the powder will fall out and you will have to restart the experiment
Jerome had read about plate tectonics and the mid-Atlantic ridge. He investigated by reading further, learning that evidence existed to show volcanic activity was happening along the mid-Atlantic ridge. How do the pillow-shaped rocks found there provide evidence that volcanic activity is taking place? A. They form only when molten material cools slowly in warm water. B. They form only along subduction zones in the trenches of the Atlantic. C. They form only when lava erupts above the water when the air is cool. D. They form only when molten material hardens quickly in cold water.
Answers
____________ In a group all on their own. No neutrons.
____________ The groups containing the transition metals.
____________ The Lewis Dot Diagram for Bromine.
____________ The Bohr Diagram for Argon.
____________ 7 valence electrons, halogen family, 74 neutrons.
____________ 16 protons, neutrons, and electrons.
____________ Creator of the periodic table.
____________ Bohr diagram for oxygen.
____________ Period 4, transition metal, 26 electrons.
____________ Noble Gases.
____________ Lewis Dot Diagram for Phosphorus.
____________ 12 protons, neutrons, and electrons.
____________ Bohr diagram for Sulfur.
____________ Full outer shell, mass is less than 10, noble gas.
____________ Lewis dot diagram for Tin.
____________ The group of the Alkali Metals.
____________ Bohr diagram for Carbon.
____________ Alkaline Earth Metal, period 4.
____________ 13 protons, 13 electrons, 14 neutrons.
____________ Same atomic number, different atomic mass.
____________ Lewis dot diagram for Barium.
____________ 8 valence electrons, period 6.
____________ Bohr Diagram for Sodium.
____________ Lewis Diagram for Sodium.
____________ The rows of the periodic table.
____________ The columns of the periodic table.
i really need help these are the only ones i really need we have 10 min plss help
Answers
how many grams of mg(oh)2 will be needed to neutralize 25 ml of stomach acid is 0.10 m hcl
Answers
To determine the number of grams of Mg(OH)² needed to neutralize 25 mL of stomach acid.Approximately 0.082 grams of Mg(OH)² will be needed to neutralize 25 mL of stomach acid that is 0.10 M HCl.
First, we calculate the number of moles of HCl:
moles of HCl = concentration of HCl × volume of HCl solution
moles of HCl = 0.10 mol/L × 0.025 L
moles of HCl = 0.0025 mol
According to the balanced equation for the neutralization reaction between HCl and Mg(OH)²:
2 HCl + Mg(OH)² → MgCl₂ + 2 H₂O
The stoichiometric ratio between HCl and Mg(OH)² is 2:1. This means that 2 moles of HCl react with 1 mole of Mg(OH)².
Since the stoichiometric ratio is 2:1, the number of moles of Mg(OH)² required will be half of the moles of HCl:
moles of Mg(OH)² = 0.0025 mol / 2
moles of Mg(OH)²= 0.00125 mol
Finally, we calculate the mass of Mg(OH)² needed using its molar mass:
mass of Mg(OH)² = moles of Mg(OH)²× molar mass of Mg(OH)²
mass of Mg(OH)² = 0.00125 mol × (24.31 g/mol + 2 ˣ 16.00 g/mol + 2 ×1.01 g/mol)mass of Mg(OH)² ≈ 0.082 g
Therefore, approximately 0.082 grams of Mg(OH)² will be needed to neutralize 25 mL of stomach acid that is 0.10 M HCl.
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If a student puts a dialysis tube with 15% salt in it, into a beaker that has only 5% salt, what would happen to the movement of water?
Answers
Answer:
- Water from beaker will move to the tube
Explanation:
Total percentage of water in the beaker;
\( = { \tt{100\% - 5\%}} \\ = { \tt{95\%}}\)
Total percentage of water in dialysis tube;
\({ \tt{ = 100\% - 15\%}} \\ = { \tt{85\%}}\)
So, there is much water concentration in the beaker than the dialysis tubing, this causes a determined percentage of water to diffuse to the tubing, and determined percentage of salt to move from tubing to the beaker.
Percentage of water moving to tubing;
\({ \tt{ = 95\% - 85\%}} \\ = { \tt{10\%}}\)
Percentage of salt moving from tubing to beaker
\({ \tt{ = 15\% - 5\%}} \\ { \tt{ = 10\%}}\)
At what FiO2 is considered in the toxic or danger
zone.
Answers
FiO2 (Fraction of Inspired Oxygen) in the toxic or danger zone is considered above 0.5 or 50%.
FiO2 is the concentration of oxygen that a patient inhales. FiO2 less than 0.21 (21%) is considered room air, and FiO2 more than 0.5 or 50% is considered toxic or dangerous. Oxygen toxicity happens when there's excessive oxygen concentration in the lungs. Oxygen at high concentrations can produce harmful reactive oxygen species that can damage the alveolar-capillary membrane and lead to inflammation and oxidative stress.
Although the use of high FiO2 may be necessary for certain medical conditions, such as respiratory failure or sepsis, the benefits must always be weighed against the potential risks of oxygen toxicity. This is why clinicians monitor oxygen levels and titrate FiO2 to maintain appropriate oxygenation while avoiding toxicity.
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express 3.81 meters in inches
Answers
Answer:
150 inches.Explanation:
3.81 m. = 150 inches.
I can't find explanation. Hope this is my best!
ANY HELP??? it’s due today
Answers
Answer:
Choose the 3rd option: methane, ozone, and carbon.
Answer:
methane and carbon dioxide
a compound has a molar mass of 170.24 g/mol is found to be 70.54% carbon, 10.66% hydrogen, and 18.80% oxygen by mass. find its empirical and molecular formulas.
Answers
The answer to the provided question is included below. C10H18O2 is the chemical formula.
Monounsaturated fatty acid citronellic acid is an oct-6-enoic acid with methyl groups at positions 3 and 7. It serves as a flavoring component and a plant metabolite. It is a medium-chain fatty acid, a monoterpene, and a monounsaturated fatty acid. It is similar to a citronellal in terms of function.We got 10 moles of carbon from 70.54% ,18 moles of hydrogen from 10.66%,2 moles of oxygen from 18.80% and a compound has a molar mass of 170.24 g/mol .C10H18O2 is chemical fromula of Citronellic acid .you can verify from below attached picture.
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Which explanation correctly describes why it is important for a cell’s surface-area-to-volume ratio to not be too small?
A. The area of the cell membrane needs to be large in comparison to the volume so the cell is able to move nutrients and wastes through it.
B. The cell would starve.
C. The cell would not produce enough waste material.
D. The organelles would grow too large to fit within the cell.