Answer:
two north poles and two south poles
Explanation:
A single magnet has a north pole and a south pole. If it is broken into two pieces, then each of the two pieces will have a north pole and a south pole.
No matter how many times or into how many pieces a magnet is broken, the resulting pieces will have two poles each.
Answer:
Each piece will still have a north pole and a south pole.
Explanation:
the normal boiling point for hbr is higher than the normal boiling point for hcl. this can be explained by question 16 options: a) larger dipole-dipole forces for hbr. b) larger dispersion forces for hbr. c) larger hydrogen-bond forces for hbr. d) larger dipole-dipole forces, larger dispersion forces, and larger hydrogen-bond forces for hbr.
A higher dispersion force than HBR leads to a higher boiling point of HBR and a larger force between dipoles.
Both HBr and HCl are polar molecules. Therefore, both molecules have dipole-dipole interactions. The attraction is greater with Hcl and HBR than with Hcl alone. Dipole-dipole forces occur between molecules with permanent dipoles (polar molecules). For molecules of similar size and mass, these forces increase with increasing polarity. Polar molecules also induce dipoles in nonpolar molecules, resulting in dipole-induced dipole forces. A higher dispersion force than HBR leads to a higher boiling point of HBR and a larger force between dipoles.
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The unit of rate constant for zero order reaction is?
The rate constant for zero-order is measured in molL-1 s-1. In a zero-order reaction, the rate of the chemical reaction is unaffected by the concentration of the reactants.
What does a zero-order response look like?A zero-order reaction is one in which the concentrations of the reactants do not fluctuate over time and the rates of concentration do not change.
First-order and zero-order reactions: what are they?The rate of a zero-order reaction is constant. The concentration of one of the reactants affects the rate of a first-order reaction. The square of a reactant's concentration or the product of the concentrations of two reactants determines the second-order reaction rate.
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The ratio of parent to daughter isotopes in a radioactive decay process is 0.40. How many half-lives have elapsed since the material was 100% parent atoms?
Two half-lives have elapsed since the material was 100% parent atoms.
The ratio of parent to daughter isotopes in a radioactive decay process is related to the number of half-lives that have elapsed since the material was 100% parent atoms. In this case, the ratio of parent to daughter isotopes is 0.40, which means that there are more parent isotopes than daughter isotopes.
Each half-life of a radioactive decay process reduces the amount of parent isotopes by half, while the amount of daughter isotopes increases by half. Therefore, after one half-life, the ratio of parent to daughter isotopes would be 0.50 (equal amounts of parent and daughter isotopes). After two half-lives, the ratio would be 0.25 (more daughter isotopes than parent isotopes).
Since the ratio in this case is 0.40, we know that two half-lives have elapsed since the material was 100% parent atoms.
In summary, the ratio of parent to daughter isotopes in a radioactive decay process is related to the number of half-lives that have elapsed since the material was 100% parent atoms. In this case, the ratio of 0.40 indicates that two half-lives have elapsed.
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What mass, in grams, of H₂ can be produced from 35.0 g Na?
2 Na + 2 H₂O → 2 NaOH + H₂
6.15 g H₂
3.08 g H₂
1.54 g H₂
4.39 g H₂
The water in an aquarium is warmed by a heater located under the gravel in the bottom of the aquarium.
Explain how the energy is transferred to the gravel.
Explain how the energy is transferred throughout the water.
Answer:I don’t really know how the energy is transferred through the gravel but for the water I believe it’s through convection of the water currents
Explanation:
The transfer of energy between systems through work is the expansion of gas in a steam engine. By doing work or by transferring heat, energy can be transferred. Therefore, convention is the process by which energy is flowing through the given system.
What is energy transfer?Energy transfer is a phenomenon in which energy transfer from one matter to another matter. Energy requirement is necessary to move nay object so work has to be done by the gas to the piston.
Heat can be transferred by three ways radiation, convention or conduction. In conduction, direct contact of two body is necessary for transfer of molecules. Convention is the process by which energy is transferred to the gravel and throughout the water.
Therefore, convention is the process by which energy is flowing through the given system.
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at a certain temperature the rate of this reaction is first order in with a rate constant of suppose a vessel contains at a concentration of . calculate how long it takes for the concentration of to decrease by . you may assume no other reaction is important. round your answer to significant digits.
1/8 of a second (2 significant figures). When this reaction occurs at a specific temperature, its rate is first order with a rate constant of let's say a concentration in a vessel.
What exactly is rate constant k?The proportionality constant (k) connecting the rate of the reaction to reactant concentrations determines the specific rate constant (SRC).
The reaction's equation is CICH2CH2Cl (g) --> CH2CHCI (g) + HCl (g)
Rate constant (k) equals 2.01 s-1
This is a first order reaction based on the rate constant's units.
Initial Concentration: 1.34 M t =
Final concentration equals 20 percent of 1.34, or 0.268 M.
First order reactions have the integrated rate rule ln[A] = ln[A]o - kt ln(0.268) = ln(1.34) - 2.01(t) -2.01(t) = - 1.6094 t = 0.8007 0.80 seconds (2 significant figures).
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Which pair of elements are nonmetals and gases at room temperature and normal atmospheric pressure?.
The pair of elements which are non-metals and at the same time; gases at room temperature and normal atmospheric pressure are as follows:
N2, O2, He, Ar
What is an element?An element is a substance which cannot be split into simpler units by any ordinary process.
Some elements are metalsSome are non-metalsSome are gasesSome few examples of elements include:
Hydrogen
Helium
Lithium
Beryllium
Boron
Carbon
Nitrogen
Oxygen
Fluorine
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A 22.0 mL volume of 0.095 M NaOH is required to reach the phenolphthalein endpoint in the titration of a 3.05 g sample of vinegar.
a. Calculate the number of moles of acetic acid in the vinegar sample.
b. Calculate the mass of acetic acid in the vinegar sample.
c. Calculate the percent by mass of acetic acid in the vinegar sample. Assume the density of the vinegar is 1.0 g/mL
a. The number of moles of acetic acid in the vinegar sample is approximately 0.0505 mol.
b. The mass of acetic acid in the vinegar sample is approximately 60.07 g.
c. The percent by mass of acetic acid in the vinegar sample is approximately 4.10%.
a. To determine the number of moles of acetic acid, we use the balanced chemical equation for the reaction of acetic acid (CH₃COOH) and sodium hydroxide (NaOH) in a 1:1 stoichiometric ratio. From the volume and concentration of NaOH used, we can calculate the number of moles of NaOH:
Moles of NaOH = volume of NaOH (L) × concentration of NaOH (mol/L)
Moles of NaOH = 0.0220 L × 0.095 mol/L
Moles of NaOH = 0.00209 mol
Since the stoichiometry of the reaction is 1:1, the number of moles of acetic acid (CH₃COOH) in the vinegar sample is also 0.00209 mol.
b. The molar mass of acetic acid (CH₃COOH) is 60.07 g/mol. Multiplying the number of moles of acetic acid (0.00209 mol) by the molar mass gives the mass of acetic acid:
Mass of acetic acid = number of moles × molar mass
Mass of acetic acid = 0.00209 mol × 60.07 g/mol
Mass of acetic acid ≈ 0.125 g
c. To calculate the percent by mass, we divide the mass of acetic acid by the mass of the vinegar sample and multiply by 100:
Percent by mass = (mass of acetic acid / mass of vinegar) × 100
Percent by mass = (0.125 g / 3.05 g) × 100
Percent by mass ≈ 4.10%
Therefore, the percent by mass of acetic acid in the vinegar sample is approximately 4.10%.
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For official use only (fouo) and controlled unclassified information (cui) may include all of the following except:.
For official use only (fouo) and controlled unclassified information (cui) may include all of the following except Personnel information. The correct answer is B,
Sensitive but Unclassified (SBU), Law Enforcement Sensitive, and For Official Use Only (FOUO) are all subcategories of Controlled Unclassified Information (CUI) (LES). Today, CUI is used more frequently than any of the previous three. For information pertaining to the government, these names are used.
Most governments use the security information classification term "For Official Use only" when referring to information. It is strictly unclassified in the US and used by the Department of Defense to manage requests for controlled Unclassified Information (CUI). Eliminating ineffective and deceptive patchwork among departments of defense agencies is the main goal of this program.
Your question is incomplete but most probably your full question was
For Official Use Only (FOUO) and Controlled Unclassified Information (CUI) may include all of the following except: (circle one) a. Secret information b. Personnel information c. Payroll information d. Sensitive information
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one of many cells in the retina of the eye that responds to low light. VOCABULARY
Answer:
I hope this helps you!
Explanation:
The retina is the back part of the eye that contains the cells that respond to light. These specialized cells are called photoreceptors. ... The rods are most sensitive to light and dark changes, shape and movement and contain only one type of light-sensitive pigment. Rods are not good for color vision.
The retina is the back thing of the eye that has the cells that respond to the light. These specialized cells are known as photoreceptors.
Which is the balanced equation for S8 O2 → SO2? S8 O16 → 8SO2 S8 O2 → S8 O2 S8 O2 → S8O2 S8 8O2 → 8SO2.
The balanced equation is as follows: S8 + 8O2 → 8SO2.
BALANCING CHEMICAL EQUATION:To balance a chemical equation means that the number of atoms of each element on both sides of the equation must be equal.
To do this, coefficients are placed in front of the element or compound involved.
According to this question, elemental sulfur (S8) reacts with oxygen gas to produce sulphur dioxide (SO2). The balanced chemical reaction is as follows:
S8 + 8O2 → 8SO2
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the water in a beaker has a volume of 50 millimeters, is this an extensive property?
No, the volume of water in a beaker is not an extensive property.
Extensive properties are those that depend on the amount or size of the substance being measured. In other words, they are properties that change with the quantity of the substance. Examples of extensive properties include mass, volume, and total energy.
In the given scenario, the volume of water in the beaker is 50 milliliters. This volume remains the same regardless of the quantity of water present. Whether it's 50 milliliters or 500 milliliters, the volume measurement does not change. Therefore, the volume of water in the beaker is an example of an intensive property.
Intensive properties are independent of the amount or size of the substance. They are characteristics that remain constant regardless of the quantity of the substance. Examples of intensive properties include temperature, density, and color.
It's important to note that the distinction between extensive and intensive properties depends on the specific property being considered. While volume is typically an extensive property for a bulk substance, in the case of a fixed volume of water in a beaker, it becomes an intensive property.
In summary, the volume of water in a beaker is not an extensive property but rather an intensive property because it does not change with the quantity of the substance.
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How many moles of N2 are found in 3.5 L?
Answer:
The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles N2, or 28.0134 grams.
Explanation:
:)
how many moles of FeCl3 are needed to produce 10 moles of PbCl2?
3.33 moles of FeCl3So, 3.33 moles of FeCl3 are needed to produce 10 moles of PbCl2.
The balanced equation for the reaction of FeCl3 with Pb(NO3)2 is as follows: FeCl3 + 3Pb(NO3)2 → 3PbCl2 + Fe(NO3)3
To determine how many moles of FeCl3 are needed to produce 10 moles of PbCl2, we must first find the mole ratio of FeCl3 to PbCl2 using the balanced equation. From the equation, we can see that for every 1 mole of FeCl3, 3 moles of PbCl2 are produced.
Therefore, the number of moles of FeCl3 needed can be calculated by multiplying the number of moles of PbCl2 by the mole ratio: moles of FeCl3
= mole ratio × moles of PbCl2 moles of FeCl3
= 1/3 × 10moles of FeCl3
= 3.33 moles of FeCl3So, 3.33 moles of FeCl3 are needed to produce 10 moles of PbCl2.
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2.
A stone has a mass of 1225 g and a density of 65 g/mL. What volume would
it displace if dropped into an overflow can full of water.
If placed into a water-filled overflow, it would displace 18.84 ml.
Why does overflow bother you?Overflowing means to flood something to the point where the liquid spills out the edges. Rivers occasionally exceed their banks after intense downpours, flooding the surrounding area.
Describe density.Density is the measurement of how tightly a substance is packed. It has such definition since it is the mass per unit volume.
Symbol for density: D
Formula for Density: Where is the density, m is the object's mass, and V is its volume, the equation is: = m/V
based on the specified value;
density=65g/ml
mass=1225g
as we know that
D=m/v
so, v=m/d
v=1225/65
=18.84ml
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Polarities of analyte functional group increase in the order of hydrocarbon ethers < esters
The correct order of the increasing polarity of the analyte functional group isEthers < Esters.
The given statement is "Polarities of analyte functional group increase in the order of hydrocarbon ethers < esters." The order of polarities of functional groups is the order of their increasing polarity (i.e., less polar to more polar) based on their electron-donating or withdrawing ability from the rest of the molecule.Polarity of analyte: The analyte's polarity is directly proportional to the dipole moment of the functional group, which is associated with a difference in electronegativity between the atoms that make up the functional group.The electronegativity of an element is its ability to attract electrons towards itself. The greater the difference in electronegativity between two atoms, the more polar their bond, and hence the greater the polarity of the molecule.
To find the correct order of the increasing polarity of the analyte functional group, let's first compare the two groups: hydrocarbon ethers and esters. Here, esters have a carbonyl group while ethers have an oxygen atom with two alkyl or aryl groups. The carbonyl group has more electronegative oxygen, which pulls electrons away from the carbon atom, resulting in a polar molecule. On the other hand, ethers have a less polar oxygen atom with two alkyl or aryl groups, making them less polar than esters. Therefore, the correct order of the increasing polarity of the analyte functional group isEthers < Esters.
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how to calculate efficiency of paint pigment
The term "pigment volume concentration" (PVC) simply refers to the volume fraction (or percentage) of the pigment in the overall volume of solids in the dried paint layer. PVC is calculated as Vp=Pigment Volume + Vb=Binder Volume.
The following equation makes it simple to calculate PVC: PVC is calculated as follows: V pigment = V pigment + V binder x 100, where V pigment and V binder are the volumes of the pigment and binder, respectively. Density and concealing also rise with an increase in PVC. PVC, or pigment volume concentration, is the ratio of the volume of non-volatile components in paint to the volume of pigment (not weight) in a paint film. Paint pigment and paint binder are examples of these non-volatile ingredients.
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I am named after the person who made the first periodic table and have 157 nuetronsin my nucleus
The element Mendelevium has 157 neutrons in its nucleus and is named after Dmitri Mendeleev who made the first periodic table.
What is the Mendelevium element?Mendelevium can be described as a synthetic element with the chemical symbol Md and atomic number 101. It is placed as a metallic radioactive transuranium element in the actinide series. This element is the first element by an atomic number that currently cannot be generated in macroscopic amounts by neutron bombardment of lighter elements.
The atomic mass of this element is 258 so it has 157 neutrons in its nucleus. The most stable is Md -258 with a half-life of 51 days, however, the shorter-lived Md-256 (half-life of 1.17 hours).
Mendelevium was discovered by bombarding alpha particles in 1955 and was named after Dmitri Mendeleev, father of the periodic table of chemical elements.
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2. A new alloy of steel is 525 g at 100°C. It is dropped into 375 grams of water at 25 °C. The final temperature changes to 55°C, what is the specific heat of steel?
Answer:
The specific heat of the steel can be calculated using the formula:
Q = mcΔT
where Q is the heat transferred, m is the mass of the steel, c is the specific heat of the steel, and ΔT is the change in temperature.
First, calculate the heat transferred from the steel to the water:
Qsteel = mcΔT = (525 g)(c)(100 °C - 55 °C) = 27675c J
Next, calculate the heat transferred from the water to the steel:
Qwater = mcΔT = (375 g)(4.184 J/g. °C)(55 °C - 25 °C) = 50202 J
Since the heat lost by the steel is equal to the heat gained by the water:
Qsteel = Qwater
27675c J = 50202 J
c = 1.81 J/g. °C
Therefore, the specific heat of the steel is 1.81 J/g. °C.
Explanation:
The temperature of a gas is 100 K and its volume is 500.0 ml. If the volume increases to 1,000.0 ml,
what is the new temperature of the gas?
Answer:
The new temperature is 200 K.
Explanation:
Charles law gives the relationship between temperature and volume of a gas. It states that volume is directly proportional to temperature such that,
\(V\propto T\\\\\dfrac{V_1}{V_2}=\dfrac{T_1}{T_2}\)
We have,
\(T_1=100\ K\\\\V_1=500\ mL\\\\V_2=1000\ mL\\\\T_2=?\)
Plugging all the values,
\(T_2=\dfrac{V_2T_1}{V_1}\\\\T_2=\dfrac{1000\times 100}{500}\\\\T_2=200\ K\)
So, the new temperature is 200 K.
Calcula el volumen en litros que tendran 2 kg de poliestireno expandidos (densidad = 0,92g/cm3)
2 kg of expanded polyethylene has a volume of 2.17 liters.
Given that,
Density = 0.9g/cm³
Mass = 2kg = 2000g
Density is the substance's mass per unit of volume. Although the Roman letter D may also be used, the sign most frequently used for density is ρ (the lowercase Greek letter rho). A substance's density changes as a function of pressure and temperature. With solids and liquids, this variance is often slight, but for gases, it is much more pronounced.
Density = Mass ÷ Volume
0.92 = 2000 ÷ Volume
Volume = 2000 ÷ 0.92
Volume = 2.17 liters.
Hence, 2 kg of expanded polyethylene has a volume of 2.17 liters.
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Your question is in Spanish. The English translation of the question is:
Calculate the volume of 2 kg of expanded polyethylene in liters. ( Density = 0.92g/cm³ )
why do minerals only form in certain areas?
Answer:
Often, chemical changes in the water might result in the release of different minerals such as salt or calcium carbonate. Pressure and heat in the process of creating metamorphic rock can also result in the formation or transformation of minerals. Minerals in igneous rocks often form where magma has cooled over time.
Explanation:
Minerals only form in certain areas due to presence of specific environment.
Minerals only form in certain areas because of the presence of suitable environmental condition for it. Every mineral needs specific environment for its formation. Without that specific temperature, pressure and some other factors, the mineral can't formed.
Every mineral needs specific environment for its formation which is different from one another so we can conclude that mineral formation needs particular environmental conditions.
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1. How many atoms of oxygen are present in 0.04 mole NaNO3?
2. How many moles of nitrogen atoms are present in 10.5g of N2O5?
3. How many atoms of oxygen are present in 50g of Fe(H20)2(S04)3? Please answer fast
Answer:
1. 7.227x10²⁴ O atoms
2. 0.1944 mol
3. 3.18x10²³ atoms
Explanation:
1. To solve this problem we need to use Avogadro's number, which states the number of molecules that are in 1 mol of a substance:
0.04 mol NaNO₃ * 6.023x10²³ molecules/mol = 2.409x10²⁴ molecules NaNO₃There are 3 O atoms per NaNO₃ molecule, thus the answer is (3* 2.409x10²⁴) 7.227x10²⁴ atoms.
2. First we convert 10.5 g of N₂O₅ into moles, using its molar mass:
10.5 g N₂O₅ ÷ 108 g/mol = 0.0972 mol N₂O₅There are 2 N moles per N₂O₅ mol, thus the answer is (2*0.0972) 0.1944 mol.
3. First we convert grams into moles:
50 g Fe(H₂O)₂(SO₄)₃ ÷ 379.85 g/mol = 0.132 molThen we use Avogadro's number:
0.132 mol * 6.023x10²³ molecules/mol = 7.95x10²² molecules Fe(H₂O)₂(SO₄)₃There are 14 O atoms per Fe(H₂O)₂(SO₄)₃ molecule, so the answer is (7.95x10²² * 4) 3.18x10²³ atoms.
Do you think a battery system has energy? Explain why.
Answer:
A battery is a device that stores chemical energy and converts it to electrical energy. The chemical reactions in a battery involve the flow of electrons from one material (electrode) to another, through an external circuit. The flow of electrons provides an electric current that can be used to do work.
Explanation:
Which element would be the least similar to magnesium (Mg)?
A) Na
B) Sr
C) Be
D) Ca
Answer:
NA
Explanation:
the other three options are alkali earth metals like magnesium (they are all in group 2). Sodium is the only one that is not an alkali earth metal.
The \(Na\) element would be the least similar to magnesium (\(Mg\) ).
Because all elements belongs to same group as magnesium except sodium.Why elements belong to same group are similar?The vertical row in the periodic table is called group.The elements in the same group shows similar properties because the number of valence electrons is same for elements in same group.What is valence electron?The electron/electrons present in valence shell is called valence electrons.
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Beryllium, the first element in group 2, has an atomic number of 4. The second element in this group has an atomic number of.
Beryllium, the first element in group 2, has an atomic number of 4. The second element in this group has an atomic number of 12.
In the field of chemistry, atomic number can be described as the number of protons that is present in the nucleus of an atom.
The atomic number of Beryllium is 4 as it has 4 protons in its nucleus.
The second member of the group 2 elements in the periodic table is Magnesium. Magnesium has an atomic number of 12 because it has 12 protons in its nucleus.
The atomic number is represented by the letter Z usually. The atomic number is usually mentioned in a periodic table at the top-left.
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NAME
HOUR
Multiple Choice Virtual 3
1. (4.10) Which atom has the greatest nuclear charge (positive charge in the nucleus)?
a. Ar
C. S
b. Si
d. Mg
Potassium permanganate (a disinfectant) and glycerin (a lubricant) react explosively according to the following equation. 14kmno4 4c3h5(oh)3 → 7k2co3 7mn2o3 5co2 16h2o how many moles of kmno4 are consumed to form 0.886 moles of carbon dioxide?
The moles of KMnO₄ needed to form 0.886 moles of carbon dioxide is 2.42 moles.
Balanced chemical reaction
14KMnO₄ + 4C₃H₅(OH)₃ → 7K₂CO₃ + 7Mn₂O₃ + 5CO₂ + 16H₂O.
Given the question:
n(CO₂) = 0.886 mol
From the chemical reaction: n(CO₂) : n(KMnO₄) = 5 : 14
n(KMnO₄) = [n(CO₂) x 14] ÷ 5
n(KMnO₄) = [0.866 mol x 14] ÷ 5
n(KMnO₄) = 12.124 ÷ 5
n(KMnO₄) =2.42 mol
So, moles of KMnO₄ are consumed to form 0.886 moles of carbon dioxide is 2.42 mol.
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Suppose you have two samples that are equal in weight, 24.3 g ni and 24.3 g cr2o3 . calculate the number of moles of each substance.
In the given samples with equal weights of 24.3 g, there are approximately 0.415 moles of Ni and 0.160 moles of Cr2O3.
The number of moles of Ni in the sample is 0.445.
To calculate the number of moles, we need to use the formula:
Number of moles = Mass of substance (g) / Molar mass (g/mol).
For Ni:
Mass of Ni = 24.3 g
Molar mass of Ni = 58.69 g/mol
Number of moles of Ni = 24.3 g / 58.69 g/mol = 0.415 mol (rounded to three decimal places).
Similarly,
The number of moles of Cr2O3 in the sample is 0.082.
For Cr2O3:
Mass of Cr2O3 = 24.3 g
Molar mass of Cr2O3 = (52.00 g/mol for Cr) + (16.00 g/mol for O) * 3 = 152.00 g/mol
Number of moles of Cr2O3 = 24.3 g / 152.00 g/mol = 0.160 mol (rounded to three decimal places).
Therefore, in the given samples with equal weights of 24.3 g, there are approximately 0.415 moles of Ni and 0.160 moles of Cr2O3.
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TRUE/FALSE.When a scientific theory has been tested and proved by the scientific community, it becomes a law.
The given statement "When a scientific theory has been tested and proved by the scientific community, it becomes a law" is false because a scientific theory is a well-substantiated explanation of some aspect of the natural world that is based on empirical observation, testing, and experimentation.
It is a widely accepted explanation that has been repeatedly tested and validated by multiple researchers in the scientific community over time. A scientific theory is never conclusively proven, but it is constantly tested and modified as new evidence and data emerge over time. In other words, a scientific theory is a comprehensive explanation of an observed phenomenon that has not been disproven or invalidated by testing or experimentation.
A scientific law, on the other hand, is a concise statement that describes a fundamental principle of nature that has been consistently observed to be true in every observed instance. A scientific law is a mathematical statement that accurately predicts a natural phenomenon based on empirical observations and data. Scientific laws are also considered to be widely accepted, but unlike scientific theories, they do not attempt to explain the underlying mechanisms or causes of natural phenomena.
To summarize, a scientific theory and a scientific law are not the same thing. A scientific theory is an explanation of a natural phenomenon that has been tested and validated over time, while a scientific law is a concise statement that describes a fundamental principle of nature that has been consistently observed to be true.
Therefore, when a scientific theory has been tested and proved by the scientific community, it does not become a law, as they are two different concepts with different meanings.
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