(a) The molality of KCl solution is 5.23 m.
(b) The molality of NaBr solution is 6.95 m.
(a) c = 4.10 M; concentration of the solution
d = 1.09 g/ml; density of KCl solution
M(KCl) = 74.55 g/mol; molar mass of the solute
b = 1000×c /1000×d - c×M(KCl)
b = 1000 × 4.1 M / 1000 × 1.9 - 4.1 × 74.55
b = 5.23 mol/kg; molality of KCl solution
(b) ω(NaBr) = 0.417; percent by mass
m = 1.0 kg; mass of the solution
m(NaBr) = 417 g; mass of the solute
n(NaBr) = 417 g ÷ 102.9 g/mol
n(NaBr) = 4.05 mol; amount of the solute
m(H₂O) = 0.583 kg; mass of water
b = n(NaBr) ÷ m(H₂O)
b = 4.05 mol ÷ 0.583 kg
b = 6.95 mol/kg; molality of NaBr solution
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calculate ionisation energy of hydrogen
2.18 x 10⁻¹⁸ J/atom is the ionisation energy of hydrogen.
The minimum energy required by an electron in an atom or ion to come out from the control of the nucleus is known as ionisation energy. It measures the capability of an element which can take part in a chemical reaction by accepting or donating electrons. It is expressed in electron volt (eV).
It will help in the understanding of the reactivity of the chemical compounds.
For Ionisation energy formula
1/λ =R[1/n₁²-1/n₂²]
n₁=1 n₂= ∞
R=1.0974 x10¹⁷m⁻¹
1/λ =1.0974 x10¹⁷m⁻¹x[1/1-0] ( 1/ ∞=0)
λ=9.116x10⁻⁸m
E=hc/λ
h=6.63x10⁻³⁴Js c=3x10⁸m/s λ = 9.116x10⁻⁸m
E=(6.63x10⁻³⁴Js x 3x10⁸m/s) ÷ 9.116x10⁻⁸m
E=2.18x10⁻¹⁸J/atom.
Ionisation energy of Hydrogen is 2.18x10⁻¹⁸J/atom.
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The elements of a brand that cannot be spoken are called the ______. brand mark trademark brand name brand equity
The elements of a brand that cannot be spoken are called option(a)i.e, brand mark.
A brand mark is a logo, design element, artistic creation, or other visual representation that facilitates the quick identification of a particular company. Building and maintaining a brand's reputation is essential.
The brand mark is significant because it draws attention, makes an impact, establishes your brand identity, is memorable, sets you apart from rivals, fosters brand loyalty, and is well-liked by your target market.
However, when examining examples of brand markings, Pepsi is without a doubt the superior firm to take into account. Coca-Cola still employs its name as part of its design, in contrast to Pepsi, which may get by with nothing more than its recognizable white, blue, and red globe to draw customers' attention.
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In the laboratory, a student dilutes 29.0 ml of a 7.71 m hydroiodic acid solution to a total volume of 200.0 ml. what is the concentration of the diluted solution?
The concentration of the diluted solution is 1.11M , using formula M1V1=M2V2 (whereM = molarity , V = volume).
The formula M1V1=M2V2 is the most widely used.
You must ensure that M stands for Molarity and V for Volume in Liters in this formula. You must divide 29.0 mL by 1,000 in order to convert this problem's mL to L units (mL =.0290 L).
M1 is the specified molarity (7.71M), and V1 is the specified molarity's volume (.0290 L).
The final molarity M2 is what we are looking for, and the final volume V2 equals 1000 L. (remember to convert the 200.0 mL to L)
Fill in the formula with your numbers.
(X) × (0.2000 L) = (7.71M) × (0.0290 L)
(7.71M) × (0.0290 L) / (0.2000 L) = (X)
1.11M = X
Given that we maintained the same number of moles in the solution, this makes sense.
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Explain in four sentences or less why menthone and isomenthone do not separate in capillary electrophoresis.
Capillary electrophoresis separates charged species according to their charge and size. Since menthone and isomenthone are stereoisomers, they have the same size and charge. As a result, they do not separate because they migrate at the same speed on electrophoresis.
Capillary electrophoresis is an analytical technique that separates ions based on their electrophoretic mobility using an applied voltage. Electrophoretic mobility depends on molecular charge, viscosity, and atomic radius.
Menthone is a mint-flavored monoterpene that is naturally present in many essential oils. l-Menthone is the most common of the four possible stereoisomers in nature, shown to the right. It is structurally related to menthol and has a secondary alcohol instead of a carbonyl.
Because of the same charge and size they do not separate through because they migrate at the same speed on electrophoresis.
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What change must made to the coefficients to balance this equation?
Answer:
C - switch the 3 and the 4
The way I did it is by rewriting the equation again but without the numbers and just balancing it myself
You have found two rocks one has a mass of 10 g the other 20 g both rocks have the same volume which rock has the greatest density
By comparing the density of the two rocks, Rock B has the greater density.
What is the density of the the two rocks?The density of a substance is a measure of the compactness of the particles of that substance.
The density of a substance is defined as the ratio of the mass amd the volume of that substance
Density = mass/ volumeThe densities of the two rocks are determined as follows:
mass of rock A = 10 g
mass of rock B = 20 g
volume of the two rock = v
Density of Rock A = 10/v
Density of Rock B = 20/v
Ratio of density of Rock A and B = 1/2
Therefore, Rock B has the greater density.
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A scientist collected 6.29 g ch4 gas (methane) through fracking how many moles of methane were collected?
Moles = mass/molar mass
mass= 6.29 g.
molar mass = 16.04 g .
Moles of methane collected are = 6.29/16.04
= 0.39.
0.39 moles of methane gas was collected.
What is methane gas?Hydrocarbon methane (CH4) is a main constituent of natural gas. Because methane is a greenhouse gas (GHG), its presence in the atmosphere has an impact on the planet's climate and temperature. There are many anthropogenic (influenced by humans) and natural sources that release methane.
High methane levels may reduce the amount of oxygen breathed from the air. This can cause symptoms like headaches, face flushing, slurred speech, visual problems, memory loss, mood swings, and altered eyesight. In dire circumstances, it's possible to have changes in breathing and heart rate, balance problems, numbness, and unconsciousness.
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Enzymes are specific or picky. So the enzyme that works with a chemical reaction of triglycerides will.
Enzymes are specific or picky. So the enzyme that works with a chemical reaction of triglycerides will work with more triglycerides.
In living organisms, enzymes are kinds of proteins that work as catalysts and accelerate the rate of chemical reactions without consuming themselves.
Enzymes are essential ingredients for humans as they are responsible for respiration, nerve function, and food digestion.
Moreover, these proteins are also vital for catabolic and anabolic reactions as they build and break substances.
These are found in all living things and are synthesized naturally in the human body.
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Please help me with this sheet on distillation, the circles require an explanation on what is happening. I have colour coded them to make it easier for you ♡
Answer:
Green: Heating & Evaporation
It is the solution which is to be distilled (separate water from the salt). Heat is applied at the flask and the solution boils hence producing vapour.
Yellow: Temperature measurements
At this point, the temperature of the vapor is measured by the thermometer. Here, discrimination occurs, when temperature is 100°C (Bpt. of water), then the temperature is made constant.
Pink: Ejection of warm water
This is the outlet on the lie big condensor of water which absorbs the temperature of the vapor. This water is released when vapor is undergoing condensation (turning into liquid)
Green: Insertion of cold water
Cold water is passed through the condensor so as to cool down the vapor into liquid
Red: Condensation
Along the tube, vapor is being cooled down and condensed into a liquid characteristic.
Purple: Water jacket (condenser)
This is the condenser tube through which cold water passes to cool down the vapor.
Blue: Distillate
The condensed vapor (water) is collected in a conical flask
Explanation:
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What is the purpose of the sodium sulfate? Why did you rinse the sodium sulfate with an additional portion of methylene chloride?
sodium sulfate binds to water and forms a precipitate to ensure a pure solution of methylene chloride.
When you want to ensure a pure solution of methylene chloride, one way to do it is to add sodium sulfate to bind with the water. This forms a precipitate, which can then be removed from the solution. This leaves you with a purer solution of methylene chloride that can be used for your needs.
Sodium sulfate is a common precipitant in the purification of methylene chloride. When added to water, it forms a precipitate that ensures a pure solution of methylene chloride. This process is known as binding, and it is an essential step in ensuring the quality of the final product.
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The amount of energy that must be absorbed or lost to raise or lower the temperature of 1gram of liquid water by 1°c.
The amount of energy that must be absorbed or lost to raise or lower the temperature of 1 gram of liquid water by 1°C is 1 calorie.
A calorie (cal), or a small calorie, is the amount of energy needed to heat one gram of water by one degree Celsius. It is used to express the amount of energy released in a phase change or chemical reaction.
One small calorie is approximately 4.2 joules.
A calorie is a unit of energy.
A calorie was originally part of the metric system (SI), but now it is replaced with the joule (J).
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Are those that can be replenished naturally. sunlight, which can be used for solar energy, is an example. question 26 options: nonrenewable resources renewable resources natural resources manufactured resources
Sunlight, which can be used for solar energy, is an example for renewable resources.
Renewable resources can be replenished and they are nondepletable. Some examples are solar energy,wind power, hydropower, geothermal, and biofuels.
Solar radiation is the source of electric energy. Solar energy is harnessed using a solar power to generate electricity.
It can be active solar or passive solar. It depends on how they capture and distribute solar energy or convert it into solar power
Biofuel is renewable energy source, but not green energy source.
Natural gas is not renewable recourse, because every year is less and less natural gas.
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What is the net force and direction of the block?
Answer: The object moves downward towards gravity
Explanation:
Gravity exerts a force of 600 N which is greater than the force exerted by air which is 200 N. Hence the object moves in the direction of the greater force applied. The net force is 600- 200= 400N.
When two amino acid monomers are positioned so that the carboxyl group of one is adjacent to the amino group of the other, they can be joined through a reaction. True or false?.
The statement is true.
When two amino acid monomers are positioned so that the carboxyl group of one is adjacent to the amino group of the other, they can be joined through a dehydration reaction.
What are amino acids?
The building blocks of protein in your body are called amino acids. In other words, you can't actually develop new muscle without your amino acids when it comes to protein synthesis. Your body can produce amino acids on its own as a byproduct of regular activity, which are known as your nonessential amino acids.
A dehydration reaction can unite two amino acid monomers when they are arranged so that the carboxyl group of one is next to the amino group of the other.
Thus, the made assertion is true.
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A theory:
a. Must be constantly tested and revised
b. Should not be consistent with pre-existing theories
c. Should never be tested
d. Both A and B
Answer:
a. Must be constantly tested and revised
Explanation:
theories should constantly be tested and revised.
what doed 2n2 denote ? Explain it with the help of two example.
The formula 2n^2 is used to find the number of electrons in a shell.
What does 2n^2?Atoms are composed of electrons in shells in addition to the protons and the neutrons in the nucleus. Electrons are known to be found in shells. The shells are arranged in order of increasing energy; KLMN. It is often important to find the number of electrons that could be found in a particular shell of an atom.
We can find the number of electrons in a shell or energy level by the use of the formula 2n^2. We know that the shells KLMN corresponds to 1, 2, 3, 4 ...
Using this model, the electrons in the K shell are 2(1)^2 = 2
Electrons in the L shell are; 2(2)^2 = 8 etc
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What would happen to the
Moon if the Earth's mass
increased?
When the Earth's mass is increased moon would spiral toward Earth.
The Moon, the fifth-largest moon in the solar system, is the sole natural satellite of Earth. Our planet's wobble is lessened and our climate is moderated by the moon's existence. The Moon is approximately 240,000 miles away from Earth (385,000km). The exosphere, the Moon's extremely thin atmosphere,
Earth's gravitational pull is influenced by its mass. The moon would move towards earth if the mass increased since the gravitational force would likewise increase.Likewise,The moon would move farther away if the mass reduced since the gravitational force would likewise decrease.The moon is close to the earth and visible at night because of gravity.
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which is the best unit of measurement for the volume of a liquid in science?
gallons
liters
feet
meters
Answer - Cubic meter (aka the meters)
Explanation - The SI unit of volume is the cubic meter (m3), which is a derived unit. Liter (L) is a special name for the cubic decimeter (dm3).
After extraction of the benzoic acid into the aqueous solution as its anionic salt, the ether solution was then washed with water two further times. What do you think was the purpose of these two wash steps?.
To remove any remaining unreacted inorganic component (from the added separating reagent) in the ether solution, two additional washes were performed after extracting benzoic acid into the aqueous solution as its anionic salt.
Benzoic acid must first be extracted from a mixture by adding NaOH, and then any excess NaOH must be removed in order to continue. Further, to get rid of the excess NaOH in the solution, it is washed with water twice or three times.
To reduce the amount of residue and other impurities in the layers, washing is done. The polar impurities, such as the leftover anionic salt of benzoic acid, tend to migrate to the water when washing, giving you a purer organic layer because ether is non-polar and water is polar.
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Biodiversity is important for the sustainability of ecosystems. However, many of the human actions that are aimed at growing communities are decreasing the biodiversity of these areas, leaving populations and ecosystems vulnerable. As human populations grow, the terrestrial and aquatic ecosystems they use may be transformed by the efforts of human beings and biodiversity losses typically accompany these processes. Which of these actions decrease biodiversity and threaten sustainability? Select ALL that apply.
A Invasive (non-native) species may outcompete native species for food and habitat. Invasive (non-native) species may outcompete native species for food and habitat.
B Regulated hunting seasons artificially decrease hunted populations, often leading to extinctions. Regulated hunting seasons artificially decrease hunted populations, often leading to extinctions.
C Pollution from building and commercialization can create health problems in exposed organisms. Pollution from building and commercialization can create health problems in exposed organisms.
D Decreased use of pesticides and fertilizers can allow for increased damage to plant life. Decreased use of pesticides and fertilizers can allow for increased damage to plant life.
E Habitat destruction reduces or eliminates the food resources and living space for most species. Habitat destruction reduces or eliminates the food resources and living space for most species.
The actions by humans that decrease biodiversity and threaten sustainability are;
Regulated hunting seasons artificially decrease hunted populations, often leading to extinctions.Pollution from building and commercialization can create health problems in exposed organisms.Habitat destruction reduces or eliminates the food resources and living space for most species.What is biodiversity?The term biodiversity has to do with the existence of different species that exist in an ecosystem. In a given ecosystem, there could be several species that exist together. This biodiversity is very much important for the continuity of balance in nature.
The actions by humans that decrease biodiversity and threaten sustainability are;
Regulated hunting seasons artificially decrease hunted populations, often leading to extinctions.Pollution from building and commercialization can create health problems in exposed organisms.Habitat destruction reduces or eliminates the food resources and living space for most species.Learn more about biodiversity:https://brainly.com/question/13073382
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Which quantity is held constant when working with Boyle's, Charles's, and Gay-Lussac's laws?
O volume
O moles
O pressure
O temperature
Answer:
moles
Explanation:
for these three principles, the volume, pressure and temperature of the particles will change whereas the moles will stay constant because the number of the particles does not change throughout the experiment.
Moles is held constant when working with Boyle's, Charles's, and Gay-Lussac's laws and the correct option is option 2.
What are Gas Laws?All gases generally show similar behaviour when the conditions are normal. But with a slight change in physical conditions like pressure, temperature or volume these show a deviation.
The gas laws are a group of laws that govern the behaviour of gases by providing relationships between the following:
The volume occupied by a gas.The pressure exerted by a gas on the walls of its container.The absolute temperature of the gas.The amount of gaseous substance (or) the number of moles of gas.Therefore, Moles is held constant when working with Boyle's, Charles's, and Gay-Lussac's laws and the correct option is option 2.
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If urine has a density of 1.08 g/ml, what would be the mass of a 139 ml urine sample?
The urine sample with a density of 1.08 g/ml and a volume of 139 ml, has a mass of: 0.39 g
The density formula and the procedure we will use is:
ρ = m/v
Where:
v= volumeρ= densitym= massInformation about the problem:
ρ= 1.08 g/mlv= 139 mlm= ?Applying the density formula and clearing the mass (m), we get:
m = ρ * v
m = 1.08 g/ml * 139 ml
m = 150.12 g
What is density?It is a physical quantity that expresses the ratio of the body mass to the volume it occupies.
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Sarah and evan are in the same science class. the teacher asks the class to design an experiment to determine the effect of acid rain on limestone. sarah designs an experiment which uses chalk and carbonic acid at a ph of 5.7, because she knows that chalk has the same chemical make-up as limestone and she knows that acid rain is primarily made up of carbonic acid at a ph around 5.7. evan designs an experiment which uses limestone tiles and acid rain collected from the environment. how do these experimental methods compare?
Sarah knows that chalk has the same chemical make-up as limestone and she knows that acid rain is primarily made up of carbonic acid at a ph around 5.7. So the correct option is (B) Sarah's materials are cheaper and easier to obtain, but Evan's materials will allow him to better mimic real life.
Limestone is a sedimentary rock mostly made of calcium carbonate (calcite) or calcium and magnesium double carbonates (dolomite). Small fossils, shell pieces, and other fossilised debris are frequently found in its composition.
Calcium oxide, which is derived from limestone, is used in the manufacture of steel, mining, paper, water treatment and purification, and plastics. Lime is extensively used in agriculture and the production of glass.
The biggest myth about limestone is that it's a delicate stone. Actually, limestone can be anything from extremely hard to soft. It should be selected keeping in mind the final design while paying close attention to its intended usage.
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The complete question is ''Sarah and Evan are in the same science class. The teacher asks the class to design an experiment to determine the effect of acid rain on limestone. Sarah designs an experiment which uses chalk and carbonic acid at a pH of 5.7, because she knows that chalk has the same chemical make-up as limestone and she knows that acid rain is primarily made up of carbonic acid at a pH around 5.7. Evan designs an experiment which uses limestone tiles and acid rain collected from the environment. How do these experimental methods compare?
A. Sarah's experimental results will be easier to predict. Evan's results will be impossible to predict since he uses real acid rain.
B. Sarah's materials are cheaper and easier to obtain, but Evan's materials will allow him to better mimic real life.
C. Evan's experimental design will prevent him from being able to form a logical conclusion, whereas a conclusion can be made with Sarah's design.
D. Evan's experiment can be preformed at any time, but Sarah's experiment can only be performed when there is a rainstorm.
At a pressure of 476 kPa, the volume of a gas is 6.00cm3. Assuming the temperature remains constant, what will be the pressure when the volume is 3.50 cm3?
The pressure when the volume is 3.50 cm³ is 816 kPa
What is the relationship between the volume and pressure of a gas at constant temperature?Pressure and volume of a gas have an inverse relationship at constant temperature
The relationship between the volume and pressure of a gas at constant temperature is given by the equation of Boyle's law:
P₁V₁ = P₂V₂P₁ = 476 kPa
V₁ = 6.00 cm³
V₂ = 3.50 cm³
P₂ = P₁V₁/V₂
P₂ = 476 * 6 /3.50
P₂ = 816 kPa
In conclusion, pressure and volume are inversely related at constant temperature.
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An organism was kept at a temperature of 40°C for a period of 2 weeks. At the end of that time, the investigator determined that the organism was sterile. To support the hypothesis that high temperatures cause sterility, the investigator should be able to show that the
1. organism was not sterile before the experiment period began.
2. high temperature did not alter the blood pressure of the organism
3. pituitary gland of the organism had not degenerated.
4. organism was homozygous for temperature sensitivity.
The investigator should show that the organism was not sterile before the experiment began. So the correct option is A.
What is a scientific hypothesis?
A scientific hypothesis is a theory that offers a speculative explanation for a phenomenon or a specific group of related events that have been observed in the natural world. The capacity to be supported or disproven by observation and experimentation are the two main characteristics of a scientific hypothesis, and they are embodied in an "If...then" statement that summarises the notion. In the middle of the 20th century, British philosopher Karl Popper, who was of Austrian descent, established the idea that a scientific theory might be both falsified and tested.
The scientific method, the strategy used by scientists to try to comprehend and evaluate theories regarding natural events, includes the formation and testing of hypotheses. The process of developing a hypothesis is commonly referred to as creative and is based on prior scientific understanding, intuition, or experience.
Therefore, the correct option is A.
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Describe (in words )the relationship between the distance and time2 as the duster accelerated down the slope (with its smooth surface in contact with the truck)
Distance and time have a direct relationship, meaning the value of one directly affects the value of the other.
Time and distance are directly related to one another. Direct relationship means that if one changes, the other changes as well. Conversely, if one changes, the other changes as well.
We can infer that there is a direct relationship between distance and time if it takes more time to travel a distance that is a huge amount, while it takes less time to travel a distance that is short.
When gravity is the only force affecting an object, freefall occurs. The length of time an object spends falling is proportionate to its distance since the acceleration of gravity on Earth is constant.
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A solution is 0.0460 m lif. what is the molarity of the solution if the density is 1.10 g/ml?
a. 0.0418 m
b. 0.0417 m
c. 0.0506 m
d. 0.0441 m
e. 0.0460 m
The molarity of the solution is c. 0.0506 m.
b(LiF) = 0.0460 m; molality of the solution
Molality is concentration expressed in moles per kilogram.
d(LiF) = 1.1 g/ml; the density of the solution
M(LiF) = 26 g/moll; molar mass of the solute
The solute is the component present in small quantities in solution.
The relation between molarity and molality is c = 1000d / (1000/b + M)
c = 1000×1.1 / (1000/0.046 + 26)
c = 0.0506 M; the molarity of the solution
Molarity is defined as the number of moles of the solute per liter of the solution. It is denoted by M.
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What is the net charge of the following amino acids at ph 1.0, 4.0, 8.0, and 12.0? (2 point each)
(a) histidine
(b) leucine
(c) aspartic acid
(d) tyrosine
(e) asparagine
Net charge
(a) histidine 0, +2, 0, -1
(b) leucine 0,
(c) aspartic acid 0
(d) tyrosine 0
(e) asparagine 0
What is ph ?
The hydrogen ion concentration is measured using the pH scale. The pH values, which range from 0 to 14, are assigned to it. Therefore, we may say that the pH value is a number that represents how acidic or basic a solution is.
A solution with a pH below 7 is referred to as acidic, and one with a pH over 7 is referred to as basic, or alkaline.
Thus, histidine has a net charge of 0 at ph 1, of 2 at ph 4 of 0 again at ph 8 and finally of -1 at ph 12.
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John wants to prove that the paved area of the playground is hotter than the grassy area of the playground. He measures the temperature of each area at three different times of the school day and records the temperatures. He does this for five days in a row. Thomas wants to replicate John's experiment. Which statement describes a situation that could cause Thomas's data to vary from John's data?
The statement that describes a situation that could cause Thomas's data to vary from John's data is as follows: Thomas measures the temperatures only on the sunny days.
How is an experiment replicable?An experiment is usually conducted under controlled conditions to test a hypothesis or determine the validity of an existing truth.
According to this question, John wants to prove that the paved area of the playground is hotter than the grassy area of the same playground. He measures the temperature of each area at three different times of the school day and records the temperatures.
However, Thomas wants to replicate this experiment carried out by John. To get the same results after replication, one must ensure to control every variable that was initially controlled.
Therefore, this means that if Thomas measures the temperatures only on the sunny days, he will get a different data from John's data because John measured the temperature on three different times of school days.
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What happens to the pressure of an ideal gas if its volume is doubled and its kelvin temperature is halved, assuming the moles of gas does not change?
By ideal gas approximation, the final pressure is 4 times greater than the initial pressure.
We need to know about the ideal gas theory to solve this problem. The ideal gas is assumed that there is no interaction between particles in a gas. It can be determined by the equation
P . V = n . R . T
where P is pressure, V is volume, n is the number of moles gas, R is the ideal gas constant (8.31 J/mol.K) and T is temperature.
From the question above, we know that
V2 = 2V1
T2 = 1/2 . T1
n1 = n2 = n
When the initial and final temperature is the same, we can use the ratio of pressure as
P1 / P2 = (n1 . R . T1 / V1) / (n2 . R . T2 / V2)
P1 / P2 = (n . R . T1 / V1) / (n . R . (1/2.T1) / 2V1)
P1 / P2 = 4
Hence, the final pressure is 4 times greater than the initial pressure.
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