Atomic orbitals undergo hybridization, which results in new orbital forms and spatial orientations.
In the localized valence bond theory, a mathematical method known as hybridization is used to construct sets of equivalent orbitals that are correctly orientated to form bonds from atomic orbitals that are similar in energy but not equivalent. Because they are created by combining (hybridizing) two or more atomic orbitals from the same atom, these new combinations are known as hybrid atomic orbitals.
By combining the beryllium 2s orbital with any of the three degenerate 2p orbitals in BeH2, we can create two equivalent orbitals.
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explain how water's entropy can decrease when it freezes without violating the second law of thermodynamics. specifically, explain what happens to the entropy of its surroundings
Entropy of water can decrease when it freezes without violating the second law of thermodynamics because there is increase in the entropy of the surroundings.
How can water's entropy decrease when it freezes?The reason that the freezing water does not violate the second law of thermodynamics is because even though the system becomes more ordered and has low entropy, energy that is released to the surroundings makes molecules move faster, which ultimately leads to an entropy increase of the surroundings.
The process of liquid -> solid is exothermic. This implies that heat released in the process causes an increase in the entropy of the surroundings. Therefore, if surroundings are included, then ΔSFreeze+ΔSSurroundings>0, which is in accordance with the second law.
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using the ideal gas law, determine how many moles of an ideal gas are required to fill a 1.09 l can at , and 1.00 atm pressure.
Using the ideal gas law, the moles of an ideal gas required are
Volume = 1.09 L
Pressure = 1.00 atm
Temperature (not given so we take the room temperature) = 25 °C or 298 K
Value of R = 0.0821 atm.L/mol.K
Number of moles = ?
Ideal gas law:
PV = nRT
Rearrange it for the number of moles (n)
n = PV / RT
Put the values
number of moles (n) = 1.00 atm × 1.09 L ÷ 0.0821 atm.L/mol.K × 298 K
number of moles (n) = 1.09 / 24.46 mol
number of moles (n) = 0.0446 mol
So 0.0446 mol of an ideal gas is required to fill 1.09 L can.
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5. Hypothesis #2: If the specimen is nonliving, then cells
(Blank)
be present when the specimen
is viewed through a microscope.
If the specimen is nonliving, then cells be present on glass slide when the specimen is viewed through a microscope.
The Greek words for little and to observe are the origin of the word microscope. Giovanni Faber first used the term "microscope" on April 13, 1625. With the use of a microscope, we can see tiny objects that would otherwise be hidden from vision. Through the act of magnification, or increasing the picture of the item, microscopes help us view tiny objects.
The lowest distance between two objects that produces two pictures that can be distinguished from one another is the resolution of a microscope. For instance, human eyes' resolution is between 0.1 and 0.2 mm. This indicates that two items that are separated by 0.1 to 0.2 mm may be distinguished by human eyes.
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draw the correct electron-dot structure h2s , hydrogen sulfide, a poisonous gas produced by rotten eggs. draw the molecule by placing atoms on the grid and connecting them with bonds. include all lone pairs of electrons.
Hydrogen sulfide, H₂S is a colorless gas with a strong odor of rotten eggs.
Hydrogen sulfide may additionally motive infection to the eyes and respiration system. It could also motive apnea, coma, convulsions; dizziness, headache, weak spot, irritability, insomnia; belly disappointed, and if liquid frostbite.
H‐S -H
Hydrogen sulfide is a drab gasoline recognized for its stinky rotten egg odor at low concentrations. It's miles extremely flammable and exceptionally poisonous. Hydrogen sulfide additionally happens obviously in sewers, manure pits, well water, oil and gas wells, and volcanoes.
It takes place certainly in crude petroleum, natural gasoline, and hot springs. Further, hydrogen sulfide is produced via bacterial wreck- down of natural materials and human and animal wastes, e.g., sewage.
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Predict how oxygen crosses the plasma membrane if the concentration of oxygen is lower inside the cell than it is outside the cell.
The oxygen crosses the plasma membrane if the concentration of oxygen is lower inside the cell than it is outside the cell is by the simple diffusion.
The diffusion can be defined as the process in which the movement of particles takes place from the lower concentration to the higher concentration through a semipermeable membrane. T he oxygen crosses the plasma membrane if the the concentration of oxygen is lower inside the it the outside the cell called as diffusion.
Thus, The oxygen crosses the plasma membrane if the concentration of oxygen is lower inside the cell than it is outside the cell is by the simple diffusion.
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Why do you believe knowing how elements and compounds react together is essential in everyday matters?
Some elements are more "reactive" than other elements; why do you think this is?
It is very important to know how elements and compounds react together because everything that surrounds us is made out of elements and compounds. Therefore, understanding how these work can allow us to have a better understanding of the world that surrounds us. Moreover, it can avoid accidents when we deal with dangerous compounds, such as when we cook or clean.
Some elements are more "reactive" than other elements because the number of electrons in the outermost shell of the atom is greater that that of others.
What are elements?A chemical element is a species of atoms that have a given number of protons in their nuclei, including the pure substance consisting only of that species.
The known elements have certain properties that helps in their identification .Those properties include but are not limited to the following:
elements has conductivity, elements has magnetism, elements has melting point, elements has boiling point, elements has color, elements has state of matter etc.Learn more about elements at: https://brainly.com/question/20096027
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Answer:
it is very important to know how elements and compounds react together because everything that surrounds us is made out of elements and compounds. Therefore, understanding how these work can allow us to have a better understanding of the world that surrounds us. Moreover, it can avoid accidents when we deal with dangerous compounds, such as when we cook or clean.
Explanation:
find the percent by mass of sodium chloride in a 1.45 m nacl solution. the density of the solution is 1.07 g/ml .
6.616% of sodium chloride is present in solution as a mass percent.
What benefits does chloride provide the body?An example of an electrolyte is chloride. It functions with additional electrolytes like sodium, potassium, & carbon dioxide (CO2). These compounds support the maintenance of the body's hydrochloric balance and correct fluid balance.
What does chloride in a blood test mean?One of the elements in your blood is chloride. Chloride blood tests determine whether you have healthy amounts of chlorine in your blood. Dehydration, vomiting, and other medical disorders are just a few of the many things that can lead to an abnormally high quantity of sodium in your blood.
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A 0. 20 mol sample of mgcl2(s) and a 0. 10 mol sample of kcl(s) are dissolved in water and diluted to 500 ml. What is the concentration of cl- in the solution?.
A 0. 20 mol sample of MgCl₂(s) and a 0. 10 mol sample of KCl(s) are dissolved in water and diluted to 500 ml. the concentration of Cl⁻ in the solution is 1M.
the equations is given as :
MgCl₂ ----> Mg²⁺ + 2Cl⁻
KCl ----. K⁻ + Cl⁻
moles of chloride ion in MgCl₂ = 2 × 0.20 mol
= 0.40 mol
moles of chloride ions in KCl = 0.10 mol
total moles = 0.40 + 0.10 = 0.50 mol
volume = 500 mL = 0.5 L
concentration Cl⁻ , molarity = 0.50 / 0.5
=1 M
Thus, A 0. 20 mol sample of MgCl₂(s) and a 0. 10 mol sample of KCl(s) are dissolved in water and diluted to 500 ml. the concentration of Cl⁻ in the solution is 1M.
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select all the strong bases from the following list. multiple select question. ca(oh)2 h2so4 nh3 naoh koh
Strong bases are Ca(OH)₂, KOH, NaOH
A strong base is a substances that behave like a base and dissociates completely to give a solution that is composed of its ion and conjugate acid and hydroxyl ion bases are substances that accept hydrogen ion H⁺ from other atom and a strong base is a base that is completely dissociated in an aqueous solution and these compound ionize in water to yield one or more hydroxide ion per molecule of base
So in that given data Ca(OH)₂, KOH, NaOH this is the strong bases because in the OH⁻ hydroxide ion yield one or more hydroxide ion per molecule of base
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Why can you not selectively epoxidize an alkene with mcpba in the presence of a ketone?.
MCPBA is useful reagent for epoxide formation and ketone to ester formation and it epoxidized alkene to epoxide and also oxidize ketone to ester and so we can't selectively epoxidize an alkene if both alkene and ketone are present
Purified mCPBA is a useful reagent for the oxidation of various classes of aldehyde α branches aliphatic aldehydes undergo beayer villiger oxidation to form formates and α bramced α-β unsaturated aldehydes yield enol formates and or epoxides and α hydoxylated aldehydes yield ketone and most aldehydes and ketone have a low celling temprature below ambient temprature that is these compound do not polymerize above room temprature and mCPBA is strong oxidant comparable to other peracid and the advantage of 3 chloroperbenzoic acid is it handling
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A lever has a 36 cm input arm and a 6 cm output arm. Find MA.
The mechanical advantage of the lever that has a 36 cm input arm and a 6 cm output arm is 0.167.
What is mechanical advantage?Mechanical advantage is the ratio of the output force produced by a machine (especially a simple machine) to the applied input force.
This means that mechanical advantage of a machine can be calculated by dividing the output force by the input force as follows:
MA = Fb/Fa
Where;
MA is the mechanical advantageFb = force of the objectFa = effort to overcome the force of the objectAccording to this question, a lever has a 36 cm input arm and a 6 cm output arm. The mechanical advantage can be calculated as follows;
MA = 6cm ÷ 36cm
MA = 0.167
Therefore, 0.167 is the mechanical advantage of the lever.
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During glycolysis, what is the source of the chemical energy that is captured in atp?.
Answer:glucose
Explanation:
Energy released during the breakdown of glucose and other organic fuel molecules from carbohydrates, fats, and proteins during glycolysis is captured and stored in ATP.
palmitic acid only contains two oxygens per sixteen carbons, whereas glucose has six oxygen atoms per six carbons. explain the significance of this when each molecule is fully oxidized
The significane is that it generates more ATP per carbon (128/16) than glucose (38/6).
What is Palmitic acid?
Palmitic acid increases LDL cholesterol levels more than other saturated fats, such as stearic acid. According to them, there is compelling evidence that high consumption of palmitic acid increases the risk of cardiovascular disease. Palmitic acid has only two oxygen atoms for every sixteen carbons, whereas glucose has six oxygen atoms for every six carbons. As a result, when fully oxidized, palmitic acid generates more ATP per carbon (128/16) than glucose (38/6). As a result, we use fat as our primary energy storage material.
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If you pour hot soup into a bowl, and the bowl stays cool to the touch, you can assume that
A
the bowl is a good insulator of heat.
B
the bowl is a good conductor of heat.
C
the bowl’s temperature cannot be measured.
D
the bowl transfers most of its heat through radiation.
How do two repelling magnets demonstrate that objects that are not in contact exert forces on each other?
Answer:
If you placed the two magnets so that opposite poles are facing each other, the force will be attractive and you will need to add more mass to the opposite side of the scale Magnetic attraction and repulsion is one of three fundamental non contact forces in nature
If there’s a attraction it comes towards one on other if there repulsion the opposite happens.
Explanation:
HELP ASPPP PLEASE THANKY OU do 6 and 7
Since you will want to keep the three small vials of vaccine cold ( between 2 and 8 degree Celsius) for up to 24 hours you will need an exothermic reaction.
An exothermic reaction can be defined as the reaction in which the energy is released in the form of heat. when we kept water in the freezer , water molecules releases the heat to the surroundings and tend to freeze to ice form.
Thus, Since you will want to keep the three small vials of vaccine cold ( between 2 and 8 degree Celsius) for up to 24 hours you will need an exothermic reaction.
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difference between the paper chromatography and chromatography
Answer:
Paper chromatography requires less preparation, whereas thin layer chromatography requires more preparation time. The stationary phase of paper chromatography is the water trapped in the cellulose filter paper. The stationary phase of the thin layer chromatography is the glass plates coated with silica gel.
Explanation:
What does the Virtual California model show most clearly? Earth science
"Virtual California" is a topologically realistic model used to simulate earthquakes in the San Andreas fault system.
The model includes elastic interactions between faults in the model, driving at the correct plate tectonic rate, and friction physics at faults using physics derived from laboratory models with parameters consistent with past seismic events. includes science. An important consequence of elastic interactions in models is the correlation of event occurrences and the emergence of spatiotemporal patterns. Without interaction, each error element works independently. Cooperative phenomena and patterns can be seen in interactions.
Previous numerical analyzes of this simulation focused on the distribution of repetition times between large events. From this, we can calculate the latency to the next major earthquake and create a hazard forecast for the California Fault. We propose and develop a new method for generating and evaluating synthetic earthquake catalogs using Virtual California. The goal of scoring is to use the paleoseismic data to identify intervals within the man-made data that best resemble current California seismic conditions. Primarily using the highest scoring states to calculate wait times and create earthquake forecasts. An alternative method involves using all states weighted to reflect how similar the recent past is to the observed data. In this way, we integrate paleoseismic data into the simulation. In this talk, I will explain how to do it, give some examples of scoring methods, the results of calculating conditional probabilities that future events will occur, and what these probabilities were calculated using all the data. report how it differs compared to all data.
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an exothermic reaction takes place. which is true of the entropy of the surroundings? group of answer choices it remains constant it decreases it increases insufficient information
The entropy of the surrounding when an exothermic reaction takes place increases.
What is an Exothermic Reaction?A reaction is defined as exothermic if the overall standard enthalpy change (H) is negative. Exothermic processes typically releases heat.
Example of Exothermic reaction:
CaO+H2O Ca(OH)3 + Heat
What is entropy?Entropy is a measurable physical characteristic and a scientific notion that is frequently connected to a condition of disorder, unpredictability, or uncertainty.
Now you know as in exothermic reaction heat is given to the surrounding hence more heat is added to the surrounding which results in the rising of entropy of the surrounding.
Hence, the entropy of the surrounding when an exothermic reaction takes place increases.
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which naturally occurring atmospheric gas is particularly of concern to scientists studying human-generated greenhouse gases?
Methane, nitrous oxide, carbon dioxide, and other manmade compounds are among the main greenhouse gases. Since it now contributes the most to the warming caused by human activity, carbon dioxide is sometimes cited as the most significant anthropogenic greenhouse gas.
About half of all carbon dioxide emissions from human activity between 1750 and 2010—the most common and longest-lasting greenhouse gas—were produced in just the previous 40 years, primarily as a result of the burning of fossil fuels and industrial operations.
What is Atmospheric gas ?Gases found in the atmosphere of the Earth are known as atmospheric gases. Although greenhouse gases (carbon dioxide, methane, nitrous oxide, water vapor, and ozone) make up 1% of the air, oxygen and nitrogen make up 99% of these gases.
About 78% of the gases in the Earth's atmosphere are nitrogen, 21% are oxygen, 0.9 % are argon, and 0.1 % are other gases. The remaining 0.1 percent of gases includes trace amounts of neon, water vapor, methane, carbon dioxide, and methane.
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How does the brain respond to an increase in body temperature?
a) Constricting the blood vessels and reducing blood supply the skin.
b) Dilating the blood vessels and increasing blood supply the skin.
c) Decreasing the amount of ADH so more water is lost in the urine.
d) Increasing the amount of ADH so less water is lost in the urine.
Answer: B - Dilating the blood vessels and increasing blood supply the skin.
Explanation:
If body temperature rises, blood vessels in the skin dilate, allowing more blood to flow near the skin’s surface. This allows heat to dissipate through the skin and into the surrounding air.
EXPERIMENT: USING THE TYNDALL EFFECT TO IDENTIFY COLLOIDS
These supplies are needed:
3 clear glasses with smooth sides
laser pointer or flashlight
red Jell-O
red food coloring
sugar
water
Procedure:
Using the regular recipe, mix up the Jell-O and fill one glass with the mixture. Let chill until it gels. Fill another glass with water and let settle until the air bubbles disperse. Fill the third glass with water and add 2 drops of food coloring and two tablespoons of sugar into the water in the third glass. Stir until you are sure the sugar is completely dissolved.
When all three glasses are ready, line them up in any order and shine the laser (or flashlight) through all three glasses at the same time.
Answer these questions:
What did you observe?
What is the Tyndall effect?
Which glass displayed the Tyndall effect?
What does that tell you about the substance in the glass?
Which glass represents a pure substance?
Which glass represents a solution?
The glass with Jell-O is a colloid, the glass with plain water is a pure substance, and the glass with sugar and red food coloring is a solution.
What I observed is that the light was scattered more in the glass with the Jell-O mixture and the glass with the sugar water. The light was not scattered in the glass with just plain water.
The Tyndall effect is the scattering of light by particles in a colloid or fine suspension.
The glass with the Jell-O mixture displayed the Tyndall effect. This tells me that the substance in the glass is a colloid.
The glass with just plain water represents a pure substance.
Therefore, the glass with the sugar water and food color represents a solution. The glass with the Jell-O mixture represents a colloid.
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beers law lab if your unknown copper sulfate solution was produced by diluting 20 ml of a more concentrated copper sulfate solution to a final volume of 100 ml, what was the original concentration of the concentrated solution?
100.0 mL of a solution containing copper was mixed in it. At 620 nm, this solution's absorbance was 0.477.
What does the focused meaning mean?Contained, present, or taking place in a constrained region or area: not dispersed. a light beam that is extremely focused. 3. fervent, fervent a task requiring numerous hours of focused work.
What does liquid concentrated mean?A liquid that has had its water removed has been strengthened by concentration. Use concentrated apple or apricot juice, honey, or both moderately to sweeten food. Condensed, rich, undiluted, and reduced are synonyms for Additional words for concentration.
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Which isomer of 1-bromo-3-tert-butylcyclohexane reacts faster when refluxed with potassium tert-butoxide?.
Trans isomer of 1-bromo-3-tert-butylcyclohexane reacts faster when refluxed with potassium tert-butoxide
Structural isomers are those isomers in which the atoms are completely arranged in a different order but they have the same molecular formulas. These are the molecules having the same kind of molecular formula with different connectivity which is completely depending upon the order they are put together.
Cis isomers are molecules with the same connectivity of atoms. They feature that the same side priority groups are placed on the same side of a double bond. Trans isomers feature molecules with same side priority groups placed on opposite sides of a double bond.
In the above given question the trans isomer of 1-bromo-3-tert-butylcyclohexane reacts faster when refluxed with potassium tert-butoxide, because in trans isomer there is less steric hindrance and therefore it can react easily, where as the cis isomer is having a lot of steric hindrance
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what products are formed when cis-3-methyl-3-hexene reacts with hydrogen bromide? a) (2r,3s)-3-bromo-3-methylhexane b) (2r,3r)-3-bromo-3-methylhexane c) (2s,3r)-3-bromo-3-methylhexane d) (2s,3s)-3-bromo-3-methylhexane e) all of the above answers
The product formed when cis-3-methyl-3-hexene reacts with hydrogen bromide is 2s,3r)-3-bromo-3-methylhexane This happens through SN1 reaction.
Cis-3-methyl-3-hexene will react with HBr through SN1 reaction. First, the H from HBr will add to the less substituted carbon in the double bond following Markonikov's rule to form a stable tertiary carbocation intermediate.
The ionic addition of hydrogen halides to alkenes proceeds through SN1. The first step involves the protonation of the alkene by the hydrogen halide that is present. This step follows the Markonikov's rule, which predicts that the proton will add to the less substituted carbon in the double bond or to the more substituted carbon atom to form the more stable carbocation. The next step is the addition of the halide ion to the carbocation. Here, the halide can add to either side of the carbocation; thus, forming a mixture of R and S products.
Cis-3-methyl-3-hexene will react with HBr Through SN1. First, the H from HBr will add to the less substituted carbon in the double bond (Markonikov's rule) to form a stable tertiary carbocation intermediate. Br− will then add to either side of the carbocation to form a mixture of (3S)-3-bromo-3-methylhexane and (3R)-3-bromo-3-methylhexane.
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In the calvin cycle, if nadph begins to run out, what would be the first compound to accumulate?.
The first compound to accumulate is 1,3-bisphosphoglycerate.
Carboxylation is step one within the Calvin cycle where carbon dioxide is bonded to a five-carbon sugar called RuPB. though it is known as the darkish response the Calvin cycle does not surely occur within the darkish or all through the nighttime time. that is because the procedure requires NADPH, which is short-lived and is derived from light-structured reactions.
The reactions of the Calvin cycle add carbon to an easy 5-carbon molecule referred to as RuBP. these reactions use chemical energy from NADPH and ATP that have been produced in the light reactions. The very last manufactured from the Calvin cycle is glucose. The Calvin cycle reactions may be organized into 3 simple degrees fixation discount and regeneration.
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How many molecules in 35 g of CO2
Answer:
35/44* 6.022*10^24
Please mark as brainliest
Explanation:
A resource is being used by a population.
Which graph represents a rapidly diminishing resource?
Responses
Graph A
Graph A
Graph B
Graph B
Graph C
Graph C
Graph D
Graph D
Answer:
Graph A.
Explanation:
Graph
It represents a constant function
Answer:
graph c
Explanation:
the solid oxide of generic metal m is added to 73 ml of water and reacts to produce a metal hydroxide solution that is 0.35 m in the resulting compound. the metal hydroxide solution then reacts with all of the 29 ml of 1.8 m hcl to form water and the metal salt. how many valence electrons must m have?
2 valence electrons must m have .
What is neutralisation reaction ?
Neutralization is the process by which acids and bases salts and water. When reacting with water, neutralization leaves excess hydrogen or hydroxide ions in solution. The pH of a neutralized solution depends on the strength of the acid or base it contains. Mixing a strong acid and a strong base makes a neutral salt. Mixing a strong acid and a weak base produces an acid. Similarly, when a weak acid is mixed with a strong acid, the salts formed are basic. Neutralization is used in many applications.
For example, acid + base —-> salt + water i. e. NaOH (sodium hydroxide, base) + HCl (hydrochloric acid, acid) ——> NaCl (salt) + H2O (water)react to form
Reaction between metal oxide and H2O
Metal oxide + H2O --> M(OH)x
Reaction between metal oxide and HCl
M(OH)x + xH2O ---> MClx + xH2O
Volume = 29 mL
Molarity of HCl solution = 1.8 M
Moles of HCl = molarity * Volume
Moles of HCl = 1.8 M * 29 mL *10^-3 L/ 1 mL
Moles of HCl = 0.0522 mol
Volume = 73 mL
Molarity of M(OH)x = 0.35 M
Moles of M(OH)x = Volume * Concentration of M(OH)x
Moles of M(OH)x = 73 mL * 10^-3 L / 1mL *0.35 M
Moles of M(OH)2 = 0.02555 mol
x = moles of HCl / moles of M(OH)x
x = 0.0522 mol / 0.02555 mol
x = 2
Number of valance electron = x = 1
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Please Help! Please answer ASAP!
15. Scientists may design an experiment with a control group, which is a set of organisms or samples that do NOT receive the treatment (the independent variable) that is being tested. Scientists
can then compare normal changes in organisms or samples with those that might have occurred
because of the treatment. The idea of a "control group" is not the same as a "controlled variable."
Suppose a scientist is doing an experiment to determine the effect of a cancer drug on mice with
lymphoma.
a. What are some of the variables the scientist should control in the experiment?
b. Describe the control group for this experiment.
This is what I have so far, but I could be wrong.
a) A control variable would be the same species of the rat that were used in the entire experiment.
b) A control group is the group of rat that do not have lymphoma.
What is control variable?
The control variable is a group which is unchanged or constant throughout the experiment. They may include temperature, humidity, pressure, experimental techniques, sample volume etc.
In an experiment control variable is the variable which must be kept constant throughout the experiment to keep the outcome of the experiment unaltered. The control group is the one that don't receive the treatment while being tested in an experiment.
Therefore, a control variable would be the same species of the rat used in the entire experiment and control variables are the one which do not have a lymphoma.
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