A student runs an experiment to figure out if the size of a wire changes how well it conducts electricity. The independent variable in this experiment is the multimeter. Therefore, option A is correct.
What is resistance ?The amount by which an object impedes or resists an electric current is referred to as resistance. The flow of electrons is referred to as electric current. Consider an example of a person struggling to move from one shop to another in a crowded market.
Because a thin wire has fewer electrons to carry the current, its resistance is greater than that of a thick wire. The relationship between resistance and the area of a wire's cross-section is inversely proportional.
Thus, The independent variable in this experiment is the multimeter,option A is correct.
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When isopropanol (c3h8o) burns in oxygen, carbon dioxide, water, and heat are produced.
Answer: True
Explanation:
This is the standard process for all Carbon based Combustion reactions.
The compound is burned with some quantity of Oxygen, and it reacts to form some amount of water and carbon dioxide.
Describe some common chemical properties of matter?
Answer:
Some are Oxidation, Reduction, Combustion and electronegativity
Explanation:
Which coefficients correctly balance the equation below
AI+CuSO - -> AI2(SO4)3+Cu
Answer:
Explanation:
In order to balance the equation, the coefficients in front of each element must be equal on both sides of the equation. Here's one way to balance the equation:
2 AI + 3 CuSO4 ---------------> 2 AI2(SO4)3 + 3 Cu
This means that for every 2 atoms of AI and 3 molecules of CuSO4, you'll get 2 molecules of AI2(SO4)3 and 3 atoms of Cu.
In a breathalyzer, ethanol is detected through a reaction with the yellow-
orange dichromate ion in which the green chromium(III) ion is produced in
the presence of acid. The following balanced chemical equation
summarizes the reaction:
3 CH3CH₂OH(aq) + 2 Cr₂O72- (aq) + 16 H (aq) → 3 CH3COOH (aq) + 4 Cr³+
(aq)+11 H2O (D)
Which of these processes occurs the fastest?
The fastest process in the reaction described in the balanced chemical equation is the production of the green chromium(III) ion in the presence of acid.
What is involved ethanol reaction?The ethanol reaction involved in a breathalyzer is a chemical reaction between ethanol (CH3CH2OH) and the yellow-orange dichromate ion (Cr2O72-). In the presence of acid, the ethanol reacts with the dichromate ion to produce green chromium(III) ion (Cr³+) and acetic acid (CH3COOH).
The reaction between ethanol and dichromate ion is used in breathalyzers to detect the presence of ethanol in a person's breath. A breathalyzer is a device used to measure the alcohol concentration in a person's breath.
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58.94 g of a substance of molecular mass 182 is dissolved in 1000 g of water at 20°C. At this temperature the vapour pressure of water is 17.5 mmHg. Calculate the vapour pressure of this dilute solution.
The vapor pressure of the dilute solution is 17.38 mmHg at 20°C.
What is the vapor pressure of solutions?Vapor pressure is the amount of pressure that the vapors apply to the liquid solvent when they are in equilibrium and at a particular temperature.
The environment's temperature and the type of liquid have an impact on vapor pressure.
To calculate the vapor pressure of the solution, we use the formula below:
Psolution = X * P°water
where;
Psolution is the vapor pressure of the solution,X is the mole fraction of water in the solution, andP°water is the vapor pressure of pure water.To calculate X, we need to know the number of moles of water and the number of moles of solute in the solution. We can assume that the volume of the solution is 1000 mL (or 1 L), since the density of water is close to 1 g/mL at room temperature.
Number of moles of water, n₁, in the solution:
n = mass / molar mass
n = 1000 g / 18.015 g/mol
n = 55.49 mol
Number of moles of solute, n₂ in the solution:
n = 58.94 g / 182 g/mol
n = 0.324 mol
Mole fraction of water in the solution:
X = n₁ / (n₁ + n₂)
X = 55.49 mol / (55.49 mol + 0.324 mol)
X = 0.994
Now we can calculate the vapor pressure of the solution:
Psolution = X * P°_water
Psolution = 0.994 * 17.5 mmHg
Psolution = 17.38 mmHg
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iupac name for this compound
The IUPAC name for the given compound is "heptanal oxime."
What is heptanal oxime?Heptanal oxime, also known as heptan-2-one oxime, is an organic compound with the chemical formula C7H15NO. It is an oxime derivative of the ketone heptan-2-one. Heptanal oxime is a colorless to pale yellow solid that is sparingly soluble in water, but soluble in many organic solvents.
Heptanal oxime is used as a chemical intermediate in the production of various compounds, such as agrochemicals, pharmaceuticals, and fragrances. It is also used as a chelating agent to form stable complexes with various metals, such as copper and iron.
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Consider a gas cylinder containing 0. 250 moles of an ideal gas in a volume of 6. 00 l with a pressure of 1. 00 atm. The cylinder is surrounded by a constant temperature bath at 292. 0 k. With an external pressure of 3. 00 atm, the cylinder is compressed to 2. 00 l. Calculate the w(gas) for this compression process, in j
The work done on the gas during the compression process is 0.0418 kJ/K.
How did we get the value?The work done on the gas during a compression process can be calculated using the equation:
w = -P * (Vf - Vi)
where P is the external pressure, Vf is the final volume, and Vi is the initial volume. The negative sign indicates that work is done on the gas.
Using the given values, we have:
w = -3.00 atm * (2.00 L - 6.00 L)
The volume units need to be converted to liters:
w = -3.00 atm * (2.00 L - 6.00 L) = -3.00 atm * (-4.00 L) = 12.00 L * atm
Next, the pressure unit must be converted to pascals:
w = 12.00 L * atm * (1.00 atm) = 12.00 L * 1.01325 * 10^5 Pa = 12.16 kJ
Finally, the work done must be divided by the temperature to get the work done per kelvin:
w / T = 12.16 kJ / (292.0 K) = 0.0418 kJ/K
So the work done on the gas during the compression process is 0.0418 kJ/K.
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In the 1920s, western powers began to expand their influence in the middle east primarily due to __________. A. The discovery of oil in the regionb. The rising number of terrorist attacks against the westc. European desires to create a jewish homelandd. Rising fundamentalist movements in iran and saudi arabia please select the best answer from the choices provided. Abcd.
In the 1920s, western powers began to expand their influence in the middle east primarily due to A. The discovery of oil in the region.
The Role of Oil in the Expansion of Western Powers in the Middle East during the 1920sIn the 1920s, the Western powers, such as Britain and France, began to expand their influence in the Middle East primarily due to the discovery of oil in the region. The discovery of oil brought enormous economic and strategic importance to the region, and the Western powers sought to secure their access to this valuable resource. The discovery of oil also helped to modernize the region, as the Western powers invested in infrastructure development, such as pipelines, ports, and railways, which facilitated the transportation of oil and other goods. The Western powers also sought to protect their interests in the region by establishing protectorates, such as Kuwait and Bahrain, and by dividing up the former Ottoman Empire into new nation-states that would be more amenable to Western influence. This led to a backlash from some in the region, who saw the Western powers as meddling in their affairs, and who called for greater independence and self-determination. Nonetheless, the discovery of oil in the region had a profound impact on the political and economic development of the Middle East and continues to shape the region's geopolitics today.
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The density of cobalt is 8.86 g/cm³. The mass of the average atom of cobalt is 9.786316
x 10-23g. How many atoms of cobalt are contained within 1.00 cm³ of cobalt?
In this question, the density of cobalt is equal to 8.86 g per cubic centimeter. The mass of average atom of cobalt is equal to 9.786 316 times 10. Raise to part minus 23 grand. So this is the mass of average item of cobalt. And we have to calculate the number of atoms of cobalt, when volume is equal to one cc. So in one cc of cobalt we have to calculate the number of atoms of COBOL present. First of all, using the formula that density is equal to mass divided by volume. We can calculate the mass of atoms present in one cc. So the mass would be equal to density, multiplied by volume. From this mass comes out to be density is 8.86 g per centimeter cube and volume is one centimeter tube. So the mass would be equal to 8.86 g. Now we have the mass of atoms present in one cc of COBOL. Now, since mass is 8.86 g and we know that 9.7863 16 times 10 raise to part -23 g is equal and to one atom since it is a mass of average atom of cobalt. So from this we can say that 8.86 g of cobalt would be equal to one divided by 9.7686316 multiply by 8.86 atoms of Cobalt. From this. By solving it, we will get the value which is equal to when we multiply and divide these things. We will get the value 9.5 times 10, raise to part 22 atoms, so 9.5 Multiply by 10 days to part 22 items are present in 8.86 g of cobalt. Or we can say that one cc of cobalt. So our answer is option A.
I hope this helps! o(〃＾▽＾〃)o
Suppose you are measuring the mass of a solid sample on a balance using a weigh boat. You record the data in a
table.
Mass of weigh boat
2.193 g
Mass of weigh boat and sample 5.063 g
What is the mass of the solid sample (in g)?
The mass of the solid sample in grams would be 2.87 grams.
Weighing methodMass of the weighing boat = 2.193 grams
Mass of the weighing boat and the sample = 5.063
In other to determine the mass of the solid sample, the mass of the weighing boat needs to be subtracted from the mass of the weighing boat and the sample.
Mass of sample = Mass of sample+weighing boat - mass of weighing boat.
= 5.063 - 2.193
= 2.87 grams
In other words, the mass of the solid sample is 2.87 grams.
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Determine the volume in milliliters of a rock that weighs 52.0 g and has a density of 19.4 g/ml. (6 points)
Taking into account the definition of density, the volume of a rock that weighs 52.0 g and has a density of 19.4 g/mL is 2.68 mL.
Definition of densityDensity is defined as the property of matter, whether solid, liquid or gas, that allows to measure the amount of mass in a certain volume of a substance.
The expression for its calculation is the quotient between the mass of a body and the volume it occupies:
denstiy= mass÷ volume
VolumeIn this case, you know that:
Density= 19.4 g/mLMass= 52 gVolume= ?Replacing in the definition of density:
19.4 g/mL= 52 g÷ volume
Solving:
19.4 g/mL× volume= 52 g
volume= 52 g÷ 19.4 g/mL
volume= 2.68 mL
In summary, the volume is 2.68 mL.
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2B.1 (b) When 178J of energy is supplied as heat to 1.9 mol of gas molecules,
the temperature of the sample increases by 1.78 K. Calculate the molar heat
capacities at constant volume and constant pressure of the gas.
The molar heat capacity at constant volume of the gas is 100 J/mol·K, and the molar heat capacity at constant pressure of the gas is 108.31 J/mol·K.
What is molar heat capacity?
Molar heat capacity, also known as specific heat capacity, is the amount of heat required to raise the temperature of one mole of a substance by one degree Celsius (or Kelvin). The molar heat capacity is expressed in units of joules per mole per kelvin (J/mol·K).
The molar heat capacities at constant volume (Cv) and constant pressure (Cp) can be calculated using the following equations:
Cv = ΔQ/ΔT (at constant volume)
Cp = ΔQ/ΔT (at constant pressure)
where ΔQ is the heat absorbed by the gas and ΔT is the change in temperature.
In this case, ΔQ = 178 J and ΔT = 1.78 K.
At constant volume, the heat absorbed by the gas will cause an increase in the internal energy of the gas, so only the Cv can be calculated.
Cv = ΔQ/ΔT = 178 J / 1.78 K = 100 J/mol·K
At constant pressure, the heat absorbed by the gas will cause an increase in both the internal energy and the pressure-volume work done by the gas, so Cp can be calculated. The relationship between Cp and Cv is given by:
Cp = Cv + R
where R is the universal gas constant (8.31 J/mol·K).
Cp = Cv + R = 100 J/mol·K + 8.31 J/mol·K = 108.31 J/mol·K
Therefore, the molar heat capacity at constant volume of the gas is 100 J/mol·K, and the molar heat capacity at constant pressure of the gas is 108.31 J/mol·K.
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See question in the picture below , will give brainliest for correct answer
Answer:
2H²+O²--> 2H²O (sry subscripts can't be written on moblie)
Explanation:
the first part of the reaction shows 4 hydrogen atoms and 2 oxygen atoms, and the second formula shows the same
What is the molarity of a solution containing 2.50 moles in 35 mL of solution?
Answer: 71.43 M.
Explanation: To calculate the molarity of a solution, we divide the number of moles of solute by the volume of the solution in liters. The volume of the solution in this case is given in milliliters, so we need to convert it to liters before we can calculate the molarity.
35 mL = 0.035 L (since 1 mL = 0.001 L)
So, the molarity of the solution can be calculated as follows:
Molarity = moles of solute / volume of solution in liters
Molarity = 2.50 moles / 0.035 L
Molarity = 71.43 M
Therefore, the molarity of the solution is 71.43 M.
The sun provides _____ to a plant, when a person eats the plant, ____ is released and then transforms into___ when the person goes for a run
Answer: no answer
Explanation:
Gas pressure depends only on the number of particles in a given volume and on their average kinetic energy. The type of particle does not matter.a. trueb. false
true. This assertion is correct. According to the kinetic theory of gases, gas pressure is defined by the quantity of gas particles in a given volume and their average kinetic energy.
The pressure of a gas is proportional to the frequency and force of collisions between gas particles and the container's walls. According to the kinetic theory of gases, gas pressure is defined by the quantity of gas particles in a given volume and their average kinetic energy. The type of particle makes no difference in calculating the pressure of a gas as long as the particles are all in the gas phase and behave according to the kinetic theory assumptions. The pressure of a gas is proportional to the frequency and force of collisions between gas particles and the container's walls.
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Metabolism can best be described as
Answer: The sum of all chemical reactions in the body.
Catabolism (breaking down)- releases energy ATP
Anabolism (building up)- Uses energy to synthesize what body needs.
Explanation:
After changing the pressure of a gas sample from 760.0 torr to 0.800 atm, it occupies 4.30 L volume. What was the initial volume of the gas?
Iodine-131 has a half-life of 8 days. How many days will it take before 32mg of Iodine-131 has decayed to 1mg?
Answer:40 days
- K = [ ln ( 1/2 ) ] / [ t 1/2 ]
- K = [ln ( 1/2 ) ] / 8 = - 0.08664 ( days )^-1
ln C/ C0 = ( - K ) ( t )
C=1mg and C0= 32mg
t = [ ln (1/32 )] / [ - 0.08664 ] = 40 days
2Hg + O2 ----> 2HgO
If you had 6 mol of oxygen and 12 mol of mercury, what would be the limiting reactant (if any)? Show your work.
According to the stoichiometry of the chemical reaction, the limiting reactant is oxygen which is important for reaction to proceed.
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.It is important while balancing chemical equations and chemical calculations used for making solutions or dilutions.
The limiting reagent is oxygen as it is present in less amount and will limit the formation of product that is mercuric oxide.Once it is used up, the reaction will not proceed.
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If 45g of salt reacts with silver nitrate what mass of silver chloride will be produced.
If 45g of salt reacts with silver nitrate. Therefore, 110.24g is the mass of silver chloride will be produced.
What is sodium chloride?Sodium chloride, also known as salt (though sea salt contains additional chemical salts), is just an ionic substance with both the chemical symbol NaCl, signifying a 1:1 ratio of chloride and sodium ions.
One mole of sodium chloride, NaCl, creates one mole of silver chloride, AgCl, according to the balanced reaction. NaCl has a molar mass of 58.5 g and AgCl has a molar mass of 143.2 g/mol.
As a result, 58.5 g of sodium chloride yields 143.2 g of silver chloride. As a result, the mass of silver chloride generated by 45 g of sodium chloride is as follows:
AgCl mass = (143.2 g 45 g)/58.5 g
= 110.24 g
Therefore, 110.24g is the mass of silver chloride will be produced.
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With carbon dioxide, what phase change takes place when the temperature
decreases from -40°C to -80°C at 2 atm?
Carbon Dioxide Phase Diagram
K
Pressure (atm)
20-
15-
10-
10
5-
0
Melting
point
-100
Solid
-80
OA. A liquid changes to a solid.
B. A gas changes to a solid.
OC. A solid changes to a liquid.
OD. A gas changes to a liquid.
Boiling
point
Liquid
ㅎ
Gas
-20
.0
Temperature (°C)
20
With carbon dioxide, the phase change that takes place when the temperature decreases from -40°C to -80°C at 2 atm is Option B. A gas changes to a solid.
How does this occur?When the temperature decreases from -40°C to -80°C at 2 atm, the pressure and temperature of the carbon dioxide falls within the region in the phase diagram where the substance changes from a gas to a solid. This process is called deposition or sublimation.
Therefore, the correct answer is as given above. It could then be concluded that the phase change that takes place when the temperature decreases from -40°C to -80°C at 2 atm is Option B. A gas changes to a solid.
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A new element with three naturally occurring isotopes has an average atomic mass determined to be 81.5529
amu. The first two isotopes have relative abundances of 76.12% and 10.27% and masses of 81.6643 amu and
81.1239 amu respectively. What is the mass of the third isotope?
- report your answer in six significant figures
- do not include units
The average atomic mass for the new element is given 81.5529 amu. The percentage abundance for the third isotope is 13.6 %. Then its atomic mass is 83.9 amu.
What are isotopes?Isotopes are atoms of same element with different atomic mass numbers. Almost all elements have two or more isotopes but not all of them are stable in nature.
The average atomic mass can be calculated from the isotopic mass and and percentage abundance as follows:
atomic mass = ∑ (isotopic mass × %abundance /100 )
Apply the isotopic mass and abundance of all isotopes given as follows:
atomic mass of the element = (76.12/100 ×81.6643 amu) + (10.27/100 × 81.1239 amu) + (13.6 /100 × X amu) =81.5529 amu.
Then,
(13.6 /100 × X amu) = 70.41 amu.
X = 83.9 amu.
Therefore, the atomic mass of the third isotope is 83.9 amu.
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The chemical formula for cesium chloride is Cs Cl.
A chemist measured the amount of cesium chloride produced during an experiment. She finds that 30.8 g of cesium chloride is produced. Calculate the number
of moles of cesium chloride produced.
Round your answer to 3 significant digits.
The number of moles of cesium chloride produced 0.183 moles.
How to calculate number of moles?The number of moles of a substance can be calculated by dividing the mass of the substance by its molar mass.
According to this question, the chemical formula for cesium chloride is CsCl. A chemist measured the amount of cesium chloride produced during an experiment. She finds that 30.8 g of cesium chloride is produced.
The molar mass of Cesium chloride is 168.36 g/mol
Moles = 30.8g ÷ 168.36g/lol
moles = 0.183 moles
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HELP PLEASE!
Based on your Retention factor values for the 5 dye standards, order the dyes from most polar to least polar.
Red #3 - 0.000
Blue #1 - 0.58
Yellow #5- 0.286
Red #40- 0.046
Blue #2- 0.095
Answer:
Red #3 is the most polar, and Blue #1 is the least polar.
Explanation:
To order the dyes from most polar to least polar, we need to look at the retention factor values. The lower the retention factor value, the more polar the molecule. So, based on the given values, the order from most polar to least polar would be:
Red #3 - 0.000
Yellow #5 - 0.286
Blue #2 - 0.095
Red #40 - 0.046
Blue #1 - 0.58
It takes 505 kJ to remove one mole of electrons from the atoms at the surface of a solid metal. What is the maximum wavelength of light capable of doing this?
The maximum wavelength of light capable of removing one mole of electrons from the atoms at the surface of a solid metal is 5.08 x 10-7 m.
What is wavelength?Wavelength is a measure of the distance between two adjacent peaks of a wave, and is typically measured in meters. It is an important concept in physics and is used to describe various phenomena such as light, sound, and radio waves.
The maximum wavelength of light capable of removing one mole of electrons from the atoms at the surface of a solid metal can be calculated using the equation E = hc/λ,
where E is the energy required to remove one mole of electrons,
h is Planck’s constant (6.626 x 10-34 J·s),
c is the speed of light (3.00 x 10-8 m/s) and λ is the wavelength of light.
Substituting the given values into this equation, we get:
E = (6.626 x 10-34 J·s) (3.00 x 10-8 m/s) / λ
505 kJ = (6.626 x 10-34 J·s) (3.00 x 10-8 m/s) / λ
λ = (6.626 x 10-34 J·s) (3.00 x 10-8 m/s) / (505 x 103 J)
λ = 5.08 x 10-7 m
Therefore, the maximum wavelength of light capable of removing one mole of electrons from the atoms at the surface of a solid metal is 5.08 x 10-7 m.
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What is the wavelength, in meters, of an alpha particle with a kinetic energy of 8.0x10^-13 J?
Answer:
approximately 6.49x10^-12 meters.
Explanation:
To determine the wavelength of an alpha particle with a kinetic energy of 8.0x10^-13 J, we can use the de Broglie wavelength equation:
wavelength = h / p
where h is Planck's constant and p is the momentum of the particle.
To find the momentum of the alpha particle, we can use the equation:
p = sqrt(2mK)
where m is the mass of the alpha particle, K is its kinetic energy, and sqrt represents the square root.
The mass of an alpha particle is approximately 6.64x10^-27 kg. Substituting the given values, we get:
p = sqrt(2 x 6.64x10^-27 kg x 8.0x10^-13 J) ≈ 1.02x10^-19 kg m/s
Now we can substitute the values of h and p into the de Broglie wavelength equation to get:
wavelength = h / p = 6.626x10^-34 J s / 1.02x10^-19 kg m/s ≈ 6.49x10^-12 m
Therefore, the wavelength of an alpha particle with a kinetic energy of 8.0x10^-13 J is approximately 6.49x10^-12 meters.
The rate constant for this first‑order reaction is 0.0340 s−1
at 400 ∘C.
A⟶products
After how many seconds will 17.2%
of the reactant remain?
=
Answer:
it will take 100 seconds for 17.2% of the reactant to remain.
Explanation:
This is a first-order reaction, which means the rate of the reaction is proportional to the concentration of the reactant. The half-life (T1/2) of a first-order reaction can be calculated as follows:
T1/2 = ln(2) / k
Where k is the rate constant.
So, the half-life of the reaction at 400 ∘C can be calculated as follows:
T1/2 = ln(2) / 0.0340 s−1 = 20.3 s
To find the time it takes for 17.2% of the reactant to remain, we can use the formula:
[A]t = [A]0 * e^(-kt)
Where [A]t is the concentration of the reactant at time t, [A]0 is the initial concentration of the reactant, k is the rate constant, and t is the time.
We want to find t such that [A]t = 0.172 * [A]0. Taking the natural logarithm of both sides:
ln([A]t / [A]0) = -kt
ln(0.172) = -k * t
t = -ln(0.172) / k = -ln(0.172) / 0.0340 s−1 = 100 s
So, it will take 100 seconds for 17.2% of the reactant to remain.
Aluminum bromide and chlorine gas react to form aluminum chloride and bromine gas.
The balanced equation is : Aluminum bromide and chlorine gas react to form aluminum chloride and bromine gas.
AlBr₃ + 3Cl ---> AlCl₃ + 3Br
The Aluminum bromide and chlorine gas will react to form the aluminum chloride and the bromine gas
AlBr₃ + Cl ---> AlCl₃ + Br
reactant product
Al 1 1
Br 3 1
Cl 1 3
The chemical equation is said to be the balanced equation if the atoms of the reactants side is equals to the atoms of the product side. Multiplying the 3 in Cl and the 3 in the Br. The equation is as follows :
AlBr₃ + 3Cl ---> AlCl₃ + 3Br
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This question is incomplete, the complete question is :
Balance the chemical equation : Aluminum bromide and chlorine gas react to form aluminum chloride and bromine gas.
PLEASE HELPPP AOSAPAOPSP
What are some of the difficulties in identifying particular drugs? Why is it important for forensic scientists to be able to identify particular drugs?
some medicines contain legal ingredients like starch and sugar, and forensic scientists must be able to distinguish between the two. Because courts rely on the data forensic scientists find in their research, it is crucial for them to be able to recognise specific substances.
How do you identify forensic drugs?The ideal technique for this evaluation is Gas Chromatography/Mass Spectrometry (GC/MS), which is frequently used in forensic laboratories. The method offers a quick, semi-automated analysis of the material and often produces enough data to pinpoint the problematic substances. To ascertain whether an unlawful substance is present in the supplied material is the aim of forensic drug chemistry. Law enforcement can seek criminal charges based on the study' findings, and the court can decide on the right sentence.
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