J.J. Thomson established the plum pudding model of an atom and discovered the electron as a result of his cathode ray tube research.
The electric discharge of a cathode ray tube was extensively researched by scientists. The crucial part was Thomson's interpretation. He interpreted the rays' deflection by the charged plates and magnets as proof of "things far smaller than atoms." Thomson determined that these bodies had a high charge-to-mass ratio and calculated the charge's actual value.
A concept of the atom as a sphere of positively charged matter with electrons positioned according to electrostatic forces was put forth by Thomson in 1904 which is now known as the plum pudding model. He not only found the electron but also concluded that it was a crucial component of an atom.
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a classification for matter that always has the same composition
Answer:
Explanation:
Matter that always has exactly the same composition is classified as a pure substance. Every sample of a given substance has the same properties because a substance has a fixed, uniform composition.
At which boundary may a mountain chain of sedimentary rock form?
convergent boundary of two continental crusts
convergent boundary of two continental crusts
convergent boundary of oceanic crust and continental crust
convergent boundary of oceanic crust and continental crust
divergent boundary between two oceanic crusts
divergent boundary between two oceanic crusts
divergent boundary of oceanic crust and continental crust
The boundary at which a mountain chain of sedimentary rock may form is the convergent boundary of two continental crusts.
The correct option is A.
What is a convergent boundary?A location on Earth where two or more lithospheric plates clash is known as a convergent boundary.
Subduction is the inevitable sliding of one plate beneath the other. The Wadati-Benioff zone, a plane with a high frequency of earthquakes, can be used to designate the subduction zone.
Sedimentary rocks may be formed at the convergent boundary of two tectonic plates.
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Answer:The answer to the question above is the second choice, "convergent boundary of two continental crusts". This type of convergence creates some of the world's largest mountain ranges. Magma cannot penetrate the thick crust. Therefore, there are no volcanoes.
Explanation:
kinda late though haha
7. Identify the precipitate in the following reaction:
MgCl₂ (aq) + 2NaOH (aq) → 2NaCl (aq) + Mg(OH)2 (s)
The precipitate in the reaction between MgCl2 (aq) and 2NaOH (aq) is Mg(OH)2 (s).
Identify the precipitate in the following reaction?The precipitate in the reaction between MgCl2 (aq) and 2NaOH (aq) is Mg(OH)2 (s).When MgCl2 (aq) and 2NaOH (aq) are mixed together, a double displacement reaction occurs, which causes the ions to switch partners.The products of this reaction are 2NaCl (aq) and Mg(OH)2 (s).MgCl2 (aq) is a soluble salt, so it is in the aqueous state, while 2NaOH (aq) is also a soluble salt, so it is also in the aqueous state.When these two compounds are mixed, the Mg2+ ion in MgCl2 (aq) switches with the 2Na+ ion in 2NaOH (aq), resulting in 2NaCl (aq) and Mg(OH)2 (s).Mg(OH)2 (s) is an insoluble salt, which causes it to form a precipitate.The precipitate Mg(OH)2 (s) appears as a white solid that is insoluble in water and settles to the bottom of the container.The reaction can be described as follows: 2MgCl2 (aq) + 2NaOH (aq) → 2NaCl (aq) + Mg(OH)2 (s).To learn more about The precipitate reaction refer to:
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marques is working hard in his organic chemistry course so that he can prepare for the mcat. identify the learning science strategies that would most effectively enable marques to learn and master the concepts of organic chemistry.
Some effective learning strategies for mastering the concepts of organic chemistry that marques easily can learn include active learning, spaced repetition and self-explanation, etc.
1. Active learning: This involves actively engaging with the material, such as through problem-solving, experimentation, and discussion on organic chemistry.
2. Spaced repetition: This involves reviewing material at increasing intervals to help retain information over time.
3. Elaborative rehearsal: This involves connecting new information to existing knowledge, such as by explaining concepts in one's own words or relating them to real-world examples.
4. Self-explanation: This involves explaining how new information relates to what one already knows and why it is important.
5. Interleaving: This involves practicing different skills or concepts within a single study session, rather than focusing on one at a time.
6. Practice Testing: This involves taking practice tests to help solidify your understanding of the material.
7. Mnemonics: This involves using memory aids such as acrostic, acronym, or mental imagery to memorize complex information.
8. Distributed practice: This involves spreading out study sessions over time, rather than cramming, to improve retention and recall.
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Water is able to dissolve many compounds as a result of which of the following?
Please choose the correct answer from the following choices, and then select the submit answer button.
O the fact that water molecules are polar and that the hydrogen atoms in water molecules have a slight negative charge
O the fact that water molecules are non-polar
O the fact that the hydrogen atoms in water molecules have a slight negative charge
O the fact that most non-water molecules are hydrophobic
O the fact that water molecules are polar
Water is able to dissolve many compounds as a result of the fact that water molecules are polar and that the hydrogen atoms in water molecules have a slight negative charge.
When a liquid spreads over the surface flippantly with out the formation of droplets, a floor is wetted. If that liquid is water, the surface is hydrophilic. Water molecules have a polar association of oxygen and hydrogen atoms—one side (hydrogen) has a wonderful electric charge and the alternative side (oxygen) had a terrible rate. This lets in the water molecule to turn out to be drawn to many different unique varieties of molecules. Generally speaking, water is right at dissolving ions and polar molecules, however terrible at dissolving nonpolar molecules.
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HELPP!! INOIC BONDS
How will Sr and O come together in an ionic bond? Complete the sentence: For
every 1 atom of Sr, there will be
atom(s) of 0.
Choose
The ionic substance strontium oxide, SrO, forms from the reaction of strontium metal with molecular oxygen.
What is ionic compounds?Positively charged ions, known as cations, and negatively charged ions, known as anions, make up ionic compounds, which are neutral substances. The name of the cation is written first, followed by the name of the anion, for binary ionic compounds (ionic compounds that only contain two types of elements).A chemical compound known as an ionic compound in chemistry is one that contains ions bound together by the electrostatic forces known as ionic bonding. Despite having both positively and negatively charged ions, or cations and anions, the molecule is generally neutral.Ionic bonding will often be present in compounds when a metal is bound to either a non-metal or a semi-metal.Learn more about Ionic compound refer to ;
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Can O2 form ionic bonds?
Yes, O2 can form ionic bonds with number of elements from periodic table.
The third most prevalent element in the universe is oxygen. It makes up around 21% of the Earth's atmosphere and two-thirds of the mass of the human body. It is extremely reactive and may interact with the majority of the periodic table's elements. Since oxygen gas is only two oxygen atoms joined together by a covalent connection, oxygen makes a covalent bond with itself. Along with other elements nearby on the periodic table, it can form covalent bonds with carbon, nitrogen, and other elements. But elements to the left of the periodic chart, including sodium and calcium, can form ionic bonds with oxygen.
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How many moles of solute are in 250ml of 2.0m cacl2?
Answer:
0.2 moles
Explanation:
To find the number of moles of solute in a solution, you can use the formula: moles of solute = concentration (in molarity) x liters of solution. In this case, the concentration of the calcium chloride (CaCl2) solution is 2.0 M, and the volume of the solution is 250 ml. To convert the volume from milliliters to liters, you need to divide by 1000, so the solution's volume is 0.25 L.
Now we can substitute the values into the formula:
moles of solute = 2.0 M x 0.25 L = 0.5 moles.
but we need to remember that calcium chloride is a salt composed of two ions (Ca2+, Cl-), so the number of moles of CaCl2 is half the number of moles of calcium ions and chloride ions. Therefore, the number of moles of solute in 250ml of 2.0m CaCl2 is 0.5/2 = 0.2 moles.
which line must the temperature and pressure have crossed if a liquid sample of x is observed to boil?
Along the AB line. The solid line between points B and C is the same as the temperature dependence graph of liquid vapor pressure. It contains all combinations of temperatures and pressures at which liquids boil. At any point along this line, liquid boils to form gas and gas condenses to form liquid at the same rate.
Boiling Water ProcessIn the general process of boiling water, we need energy from heat. This energy then makes the bonds of the water molecules begin to break free and the molecules spread out.
the process of boiling water doesn't happen instantly. Before the water reaches the boiling point at 100℃ and bubbles so actively, air bubbles start to appear before the boiling point is reached.
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How many moles are in 5.02 X 1023 atoms of chlorine gas
It takes 5.02 1023 units of a chemical to make up one mole (such as atoms, molecules, or ions).
Chlorine gas has how many moles?The periodic table's atomic weight in g/mol for chlorine, which is 35.45 g/mol, can be used to calculate the mass of one mole of chlorine gas. This value is known as the molar mass.It takes 6.022 1023 units of a chemical to make up one mole (such as atoms, molecules, or ions). Avogadro's number or Avogadro's constant are both designations for the number 6.022 1023.By canceling these atoms, we can calculate the amount of gold that is equivalent to 0.87 moles. Hope you can understand the solution; this is the answer.To learn more about mole refer to:
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Atoms of an element containing different numbers of neutrons but the same number of protons are called .
Atoms that contain the same number of protons but different numbers of neutrons are called isotopes of the element. We total the number of protons and neutrons to name the isotope.
Answer: Your answer would be, Isotopes!
Explanation: Isotopes, also known as isotopic nuclides, are two atoms with the same atomic number but different masses (the same number of protons but different numbers of neutrons).
What happens to electrons during reduction?
During a reduction reaction, electrons are gained by the molecule or ion that is being reduced.
This is the opposite of an oxidation reaction, where electrons are lost. The electrons that are gained by the molecule or ion that is being reduced typically come from another molecule or ion, which is then oxidized.
Reduction is a chemical reaction in which electrons are transferred from one molecule or ion to another. This process is the opposite of the oxidation reaction, which involves the loss of electrons. In a reduction reaction, the molecule or ion that gains electrons is said to be reduced, while the molecule or ion that loses electrons is said to be oxidized.
Reduction reactions are important in many areas of chemistry, including organic chemistry and biochemistry.
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What number of sulfur moles are in one mole of dinitrogen tetrasulfide
There are 4 sulphur in one mole of dinitrogen tetrasulfide. The molar mass of the compound is 156 g /mol. The mass contribution by sulfur is 128 g corresponds to 4 moles of sulphur.
What is dinitrogen tetrasulfide ?Dinitrogen tetrasulfide is a covalent compound formed through the sharing of electrons between nitrogen and sulphur atoms. Sulphur shares its two valence electrons and nitrogen shares its two valence electrons with sulphur and one with the second nitrogen.
The atomic mass of sulphur = 32 g/mol
atomic mass of nitrogen = 14 g/mol
molar mass of dinitrogen tetrasulfide = (14× 2) + (32 × 4 ) = 156 g/mol
There no.of moles of sulphur = 128 /32 = 4 moles.
Therefore, there are 4 moles of sulphur in the compound.
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why does the potential energy increase when the magnets are against each other but are from the opposite direction of the magnetic force??
The potential energy is increased because their ability to do work on each other is not increased. Potential energy is decreased because moving magnets apart always decreases potential energy.
What is meant by potential energy?
Potential energy is a form of stored energy that is dependent on the relationship between different system components.When a spring is compressed or stretched, its potential energy increases.If a steel ball is raised above the ground as opposed to falling to the ground, it has more potential energy.The position, organization, or state of the object or substance determines the amount of stored energy. It can be pictured as energy with the "potential" to perform labor.Any object that is raised from rest has energy that can be released at a later time; for this reason, it is referred to as potential energy.To learn more about potential energy refer to
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if your front lawn is 16.0 16.0 feet wide and 20.0 20.0 feet long, and each square foot of lawn accumulates 1350 1350 new snowflakes every minute, how much snow, in kilograms, accumulates on your lawn per hour? assume an average snowflake has a mass of 2.00 mg.
First, we need to calculate the total area of the lawn in square feet. We can do this by multiplying the width and length of the lawn:
16.0 feet * 20.0 feet = 320.0 square feet.
Next, we need to calculate the total number of snowflakes that accumulate on the lawn per minute. We can do this by multiplying the area of the lawn by the number of snowflakes per square foot per minute:
320.0 square feet * 1350 snowflakes/square foot/minute
= 432000 snowflakes/minute.
We want to know the amount of snow in kilograms that accumulates on the lawn per hour, so we need to convert the number of snowflakes to a mass in kilograms. We know that each snowflake has a mass of 2.00 mg, so we can convert this to kilograms by dividing by 1,000,000:
2.00 mg / 1,000,000 = 0.000002 kg/snowflake.
Now we can multiply the mass of one snowflake by the number of snowflakes per minute to get the total mass of snow in kilograms that accumulate on the lawn per minute:
0.000002 kg/snowflake * 432000 snowflakes/minute = 0.864 kg/minute.
Finally, to find the total mass of snow in kilograms that accumulates on the lawn per hour, we multiply the mass of snow in kilograms that accumulates per minute by the number of minutes per hour:
0.864 kg/minute * 60 minutes/hour = 51.84 kg/hour.
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Balance the following reactions using coefficients
If the coefficient is a 1, then you must put the 1 into the blank
C₂H5OH()+
O₂(g) ->
CO₂(g) +
CaC₂(s) +
Sr(s) +
Asl3(s)->
CuSO4(aq) +
H₂O(0) ->
HNO3(aq)->
As(s) +
KI(S) ->
Ca(OH)₂(s) +
Sr(NO3)2(aq) +
12(s)
Cul(s) +
H₂O(0)
C₂H₂(g)
H₂(g)
1₂(s) +
K₂SO4(aq)
1st and 2nd reactions are balanced reactions and the rest are not.
What is balanced reaction ?A balanced chemical equation is a chemical equation in which the number of atoms for each element in the reactants side is equal to the number of atoms for that same element in the products side. This means that the equation follows the law of conservation of mass, which states that the total mass of the reactants must be equal to the total mass of the products. Balancing a chemical equation involves adding coefficients (numbers in front of a chemical formula) to the reactants and/or products to make sure that the number of atoms for each element is the same on both sides.
Reaction 1: C₂H₅OH(l) + 3O₂(g) -> 2CO₂(g) + 3H₂O(g)
Reaction 2: 2Cu(s) + Asl3(s) -> 3As(s) + 3Cu(s)
Reaction 3: 2Cu(s) + O₂(g) + H₂O(l) -> CuSO₄(aq) + 2H₂(g)
Reaction 4: HNO₃(aq) -> NO(g) + 1/2O₂(g) + H₂O(g)
Reaction 5: 2KI(s) + As(s) -> K₂AsI₃(s)
Reaction 6: Ca(OH)₂(s) + Sr(NO₃)₂(aq) -> Ca(NO₃)₂(aq) + Sr(OH)₂(s)
It is important to note that the 3rd, 4th, 5th and 6th reactions are not balanced, that means that the number of atoms of each element on reactants side is not equal to the number of atoms of each element on products side.
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Which term describes the phase change that occurs when intermolecular forces (attractions) completely overcome kinetic energy (motion) and the material has little to no motion?
Explanation:
If the kinetic energy is less than the attractive forces, a liquid or solid will form.
The average kinetic energy of the particles in a solid is very less almost negligible this is because they have high attractive forces between their molecules as they are tightly packed in regular lattices and are vibrating about their mean positions.
Therefore, freezing of a liquid or the sublimation of a gas results in the formation of a solid. These two phase changes result in the overcoming of K.E completely.
Answer:
freezing
Explanation:
Use the ion-electron method to balance the equation involving the reaction between potassium and water that produces potassium hydroxide and hydrogen gas, (Pure water and diatomic hydrogen do not ionize.)
Answer:
Explanation:
The equation for the reaction between potassium and water to produce potassium hydroxide and hydrogen gas is:
K + H2O -> KOH + H2
Using the ion-electron method, we can balance the equation as follows:
Write the unbalanced equation
K + H2O -> KOH + H2
Write the ionization equation for H2O (water)
H2O -> H+ + OH-
Multiply the coefficients in the ionization equation by the number of H2O molecules in the unbalanced equation (in this case, one) to balance the number of H+ and OH- ions
H2O -> H+ + OH-
Substitute the H+ and OH- ions into the unbalanced equation
K + H+ + OH- -> KOH + H2
Balance the remaining atoms and charge
K + H+ + OH- -> KOH + H2
check charge and atom balance
K + H+ + OH- -> KOH + H2
Simplify the equation
K + H2O -> KOH + H2
The balanced equation is K + H2O -> KOH + H2
Classify each organic compound based on the functional group it contains
Organic compound which has -OH as functional group is classified as alcohols while those with -COOH as functional group are classified as carboxylic acids.
What is functional group?Functional group is defined as a substituent or group of atoms or an atom which causes chemical reactions.Each functional group will react similarly regardless to the parent carbon chain to which it is attached.This helps in prediction of chemical reactions.
The reactivity of functional group can be enhanced by making modifications in the functional group .Atoms present in functional groups are linked to each other by means of covalent bonds.They are named along with organic compounds according to IUPAC nomenclature.
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NaCl molar mass? show solution pls
58.44 g/mol. One mole of sodium chloride weighs 58.44 g. (6.02 x 1023 formulas). To put it another way, it provides the grams of a substance per mole.
A molar mass A chemical compound's mass M is equal to the molecular weight (M) of the substance. MB = m/nB, where m is the total mass of a sample of a pure substance and nB is the amount of substance B expressed in moles, is the formula for this equation. Pure substance falls under the definition. You can find out how much a compound weighs in moles by looking at its molar mass. To put it another way, it provides the grams of a substance per mole.
Calculation:58.44 g/mol
The mass of a mole of sodium chloride is 6.02 x 1023 formulae.
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what is the molality of a solution that contains 0.625 g of argon dissolved in 150 g of water? report your answer in mol/kg and round to the third decimal place.
It is computed that 0.625 g of argon dissolved in 150 g of water has a molality of 0.1 moles/kg.
Molality is one way to describe the amount of a solute in a solution. You can express the unit of measurement as kilograms of solvent divided by moles of solute. The solute's mass needs to be translated into moles. In order to determine the molality of the given solution, further divide it by the mass of the solvent.
Since, the water weighs 150.0 grams.
But first, the moles should be determined.
moles= mass/ mass molar
moles = 0.625 g/ 39.948 g/ moles
= 0.0156 moles.
molality = moles / kg
molality = 0.015 moles/ 0.15 kg
molality = 0.1 moles/ kg
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How many moles of potassium oxide (k20) will be formed when 1.52 moles of potassium reacts with oxygen according to the following reaction: 4k + o2 yield 2 k20
According to the stoichiometry of the given chemical reaction, 1.835 moles of potassium oxide will be formed when 1.52 moles of potassium reacts with oxygen .
What is stoichiometry?Stoichiometry is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.
Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.
In the given reaction 156 moles of potassium gives 188.4 moles of potassium oxide, thus, 1.52 moles will give 1.52×188.4/156=1.835 moles.
Thus, 1.835 moles of potassium oxide will be formed when 1.52 moles of potassium reacts with oxygen .
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of the following types of bonds or interactions between atoms in aqueous solutions, which is the weakest?
Van der Waals forces are the weakest bonds or interaction among all the aqueous solution.
Van der Waals forces, which depend on the separation between atoms or molecules, are weak intermolecular forces. These interactions between uncharged atoms and molecules give rise to these forces.
Three types of van der Waals forces may be distinguished: electrostatic, inductive, and dispersion. In each class, the dipole-dipole, dipole-induced dipole, and London dispersion contributions are often the only interactions that are included in textbooks since they are always substantial when they occur. Various elements have different melting and boiling temperatures due to van der Waals force. The more energy (heat) required to dissolve an atom's bonds, the stronger the force holding them together.
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A sample of neon occupies 3.25 L at 35ºC and 1829 mm Hg. What will the temperature of the gas be, in degrees Celsius, at a volume of 4250 mL and a pressure of 1.25 atm?
The temperature (in degrees Celsius) of the gas at a volume of 4250 mL and a pressure of 1.25 atm is -63.8 °C
How do I determine the temperature?The temperature of the gas at a volume of 4250 mL and a pressure of 1.25 atm can be obtained by using the combined gas equation as illustrated below:
Initial volume (V₁) = 3.25 LInitial pressure (P₁) = 1829 mmHgInitial temperature (T₁) = 35 °C = 35 + 273 = 308 KNew volume (V₂) = 4250 mL = 4250 / 1000 = 4.25 LNew pressure (P₂) = 1.25 atm = 1.25 × 760 = 950 mmHgNew temperature (T₂) =?P₁V₁ / T₁ = P₂V₂ / T₂
(1829 × 3.25) / 308 = (950 × 4.25) / T₂
Cross multiply
1829 × 3.25 × T₂ = 308 × 950 × 4.25
Divide both side by (1829 × 3.25)
T₂ = (308 × 950 × 4.25) / (1829 × 3.25)
T₂ = 209.2 K
Subtract 273 to obtain answer in °C
T₂ = 209.2 - 273 K
T₂ = -63.8 °C
Thus, we can conclude that the temperature is -63.8 °C
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at what temperature is the pressure of the vapor in a liquid equal to the external pressure on that liquid?
Answer: Boiling Point/Boiling Temperature. 212°F or 100°C.
Explanation:
How much is 1 mole of CH4?
1 mole of CH4 is Avogadro's number of molecules. So 1 mole of CH4 is about 16.04 grams.
About MoleMole is the base unit for the quantity amount of substance in the International System of Units. After being redefined in 2019, the definition of the unit mole, as stated in the ninth edition of the SI Brochure, is as follows.
The mole, which is symbolized by the mole, is the SI unit amount of substance . One mole contains exactly 6.02214076×1023 elementary entities. This number, called Avogadro's number, is the fixed numerical value of Avogadro's constant NA when expressed in units of mol−1.
The amount of substance, which is symbolized by n, in a system is a measure of the number of certain elementary entities. Elementary entities can be in the form of atoms, molecules, ions, electrons, other particles, or a certain group of particles.
Previously, this unit was defined as the amount of chemical substance containing a representative number of particles (now called elementary entities), for example atoms, molecules, ions, electrons, or photons, which is equivalent to the number of atoms in 12 gram of carbon-12 (12C), isotopes carbon with a definitive standard atomic weight of 12. This number was also previously expressed as Avogadro's number. Before being precisely defined in the redefinition, the Avogrado number was considered to be "approximately" to 6.022140857×1023 mol−1.
The mole is widely used in chemistry as a convenient way of expressing the amounts of reactants and products in a chemical reaction. For example, the equation 2 H2 + O2 → 2 H2O means that 2 mol dihydrogen (H2) and 1 mol dioxygen (O2) react to form 2 mol of water (H2O). The mole is also used to express the number of atoms, ions or other elementary entities in a sample of a given substance. The concentration of a solution is generally expressed as molarity, which is defined as the number of moles of solute per liter of solution.
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In aqueous solutions, which type of bond or force has similar bond strength as ionic bond interactions? A. Nonpolar covalent bond B. Hydrogen bonds C. Polar covalent bond
In aqueous solutions, hydrogen bonds have similar bond strength as ionic bond interactions. Thus option B is the answer.
In aqueous solutions, ionic interactions occur between positively and negatively charged ions, which are held together by electrostatic forces. These forces are relatively strong and are responsible for the high melting and boiling points of ionic compounds. Hydrogen bonds, on the other hand, are a type of dipole-dipole interaction between the partially positive hydrogen atom of one molecule and the partially negative atom of another.
The strength of hydrogen bonds is about 5-10% of the strength of covalent bonds, which is similar to the strength of ionic bonds in aqueous solutions. This makes hydrogen bonds the type of bond or force that has similar bond strength as ionic bond interactions in aqueous solutions. These type of bonds are found in many biomolecules like DNA and RNA, proteins and many other natural and synthetic compounds.
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What is the balanced equation for h2o2 → h2o o2?
The balanced chemical equation for the decomposition of hydrogen peroxide (H2O2) into water (H2O) and oxygen (O2) is: for H2O2 → H2O O2 is 2H2O2 → 2H2O + O2
This equation shows that two molecules of hydrogen peroxide (H2O2)decompose into two molecules of water and one molecule of oxygen. The coefficients in front of each molecule indicate the stoichiometry, or the ratio of the number of moles of each substance involved in the reaction. This equation is balanced because the number of atoms of each element on both sides of the equation is the same, and there are 2 hydrogen atoms, 4 oxygen atoms on both sides. It's important to note that the decomposition of hydrogen peroxide is an exothermic reaction, meaning it releases heat energy, and it is catalyzed by enzymes such as catalase.
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Solve the problem using the equation:
2AI + 3S --> Al2S3
▸
How many moles of Al2S3 can be
produced from 12 moles of Al?
Answer:
The answer is 6 moles.
Explanation:
To calculate the amount of Al2S3 that can be produced from 12 moles of Al, we need to determine the amount of S that is required:
12 moles Al / 2 moles Al per mole Al2S3 = 6 moles Al2S3
3 moles S per mole Al2S3 * 6 moles Al2S3 = 18 moles S
Since 12 moles of Al are available, the maximum amount of Al2S3 that can be produced is 6 moles.
What is the key difference between test and negative control groups in an experiment? The independent variable is not manipulated in a test group. A negative control group has a known and expected response to manipulation Subjects in a test group should have different characteristics than subjects in a negative control group. The independent variable is not manipulated in a negative control group.
Option (d) is correct. The independent variable is not manipulated in a negative control group.
A control group is a subset of participants who are kept apart from the other participants so that the results of the independent variable under study are not affected. The effects of the independent variable on the experiment are isolated. Another differences made in between positive and negative control groups. The experimental settings in positive control group ensure a favorable outcome. An experiment that has a positive control group can demonstrate that the experiment is going in a proper way. A control group is most required for the separation of experiment in a proper way.
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The complete question is,
What is the key difference between test and negative control groups in an experiment?
(a) The independent variable is not manipulated in a test group.
(b) A negative control group has a known and expected response to manipulation
(c) Subjects in a test group should have different characteristics than subjects in a negative control group.
(d) The independent variable is not manipulated in a negative control group.