If benzene, toluene, ethyl benzene, and xylene were found in your blank control sample of carpeting from a suspected arson fire scene that has been analyzed by GC, could the presence of these same compounds in the suspected sample still be used to determine whether an ignitable was used to initiate the fire? Explain your answer for any credit, i.e. please do not simply guess.
Answers
Yes, the presence of benzene, toluene, ethyl benzene, and xylene in the suspected sample can still be used to determine whether an ignitable was used to initiate the fire. However, it would require further analysis and interpretation of the data.
The presence of these compounds in the blank control sample indicates that they are present in the surrounding environment and could be present in materials that were not involved in the fire. Therefore, it is necessary to determine whether the concentrations of these compounds in the suspected sample are significantly higher than those in the blank control sample.
If the concentrations of these compounds are significantly higher in the suspected sample, it could indicate the use of an ignitable liquid to initiate the fire. However, further analysis would be required to rule out other potential sources of these compounds and to determine whether they are consistent with the use of a specific type of ignitable liquid. Therefore, the presence of these compounds alone is not conclusive evidence of arson, but it can provide valuable information to investigators.
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Related Questions
Which of the following is NOT a type of nuclear decay? *
Alpha
Beta
Gamma
Delta
Answers
Answer:
Delta
Explanation:
Delta is a not a type of nuclear decay. Most times, the delta sign is used to denote a change between the initial and final states of a reaction.
There are three main types of nuclear decay which are:
Alpha decayBeta decay Gamma decayAlpha decay results in the formation of alpha particles. Beta decay produces electron like particles. Gamma decay produces gamma radiations.A lump of zinc is tossed into a beaker of 500L of 14M hydrochloric acid. this reaction produces Hydrogen Gas and zinc (II) chloride. If the hydrogen gas is combusted and produces 645L of water vapor at 400 kelvin and 1.75 atm, what is the mass of the zinc?
Answers
If the hydrogen gas is combusted and produces 645L of water vapor at 400 kelvin and 1.75 atm, 2796.96 g mass of the zinc is produced .
Using the ideal gas law equation:
PV = nRT
n = (PV) / (RT)
= (1.75 atm * 645 L) / (0.0821 atm·L/(mol·K) * 400 K)
= 42.71 moles
the balanced equation for the reaction between zinc and hydrochloric acid:
Zn + 2HCl -> \(ZnCl_{2}\) + \(H_{2}\)
1 mole of zinc produces 1 mole of hydrogen gas. Therefore, the moles of zinc are also 42.71.
The molar mass of zinc is 65.38 g/mol.
Mass of zinc = moles of zinc * molar mass of zinc
= 42.71 moles * 65.38 g/mol
= 2796.96 g
Therefore, the mass of the zinc is 2796.96 grams.
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If you want to lower water's freezing point 18 degrees C by adding NaCl, what must the molality of the salt solution be? (K(f) for water ris 1.86 degree C/m)
Answers
Answer:
4.84 m
Explanation:
To solve this problem we need Frezing point depression.
Formula is: ΔT = Kf . m . i
ΔT = 18°C
This is data. ΔT is the difference, Freezing T° of pure solute - Freezing T° of solution.
Kf = 1.86 °C/m
m = molality. Our unknown.
i = Ions dissolved in solution, also called Van't Hoff factor.
NaCl → Na⁻ + Cl⁻
Sodium chloride can produce 2 moles of ions.
We replace data: 18°C = 1.86 °C/m . m . 2
18°C / (1.86 °C/m) . 2 = m
molality = 4.84
After a 4.626g sample of silver oxide is heated, 4.306g of silver metal remains. What is the empirical formula of the compound?
please help me ;(
Answers
Answer:
The empirical formula is Ag2O.
The empirical formula is Ag2O.Explanation:
The empirical formula is Ag2O.Explanation:The empirical formula is the simplest whole-number ratio of atoms in a compound.
The empirical formula is Ag2O.Explanation:The empirical formula is the simplest whole-number ratio of atoms in a compound.The ratio of atoms is the same as the ratio of moles. So our job is to calculate the molar ratio of Ag to 2O.
do the steps ...
To get this into an integer ratio, we divide both numbers by the smaller value.
From this point on, I like to summarize the calculations in a table.
ElementAgMass/gXMolesXllRatiomllIntegers
—————————————————−———mAgXXXm7.96Xm0.07377Xll2.00mmm2
mlOXXXXl0.59mm0.0369Xml1mmmml1
There are 2 mol of Ag for 1 mol of O.
Answer:
Hello There!!
Explanation:
The answer is↬The empirical formula is Ag2O. It is the simplest whole-number ratio of atoms in a compound.
hope this helps,have a great day!!
~Pinky~
All the simple machines make work easier to do by changing the _____ or _____ of a force. A. size; type B. work; type C. size; direction D. type; direction
Answers
Answer:
C. size; direction
Explanation:
By definition, a machine is referred to any device that makes work easier. It takes force to do work, hence, work refers to the application of force over a particular distance. A machine aims at making the work easy by changing how it is done. Simple machines, which include: levers, pulleys, inclined planes etc. all carry out the same thing, which is to make work easier, by changing the size/magnitude and direction of the applied force.
A simple machine tends to change the size of the inputted force by increasing it over a shorter distance. The machine increases the force applied better than it can be done manually e.g. a plier and nutcracker increases/changes the applied force better than it can be done with bare hands.
Also, a simple machine can achieve making work easier by changing the direction at which the force is applied. The machine applies the force on the object in an opposite direction or contrary to the way it was manually applied.
When mixing vinegar with baking soda a _______________ will occur.
Answers
Answer:
Decomposition reaction
Explanation:
When vinegar and baking soda are first mixed together, hydrogen ions in the vinegar react with the sodium and bicarbonate ions in the baking soda. The result of this initial reaction is two new chemicals: carbonic acid and sodium acetate. The second reaction is a decomposition reaction
A teacher needs to prepare 4.5 L of 1.0 mol/L ehtanoic acid for an investigation. What volume of concentrated 17.4 mol/L ethanoic acid is required?Select one:a.65 mLb.260 mLc.130 mLd.520 mL
Answers
ANSWER
The initial volume of the acid is 260mL
EXPLANATION
Given that;
The final volume of the ethanoic acid is 4.5L
The final concentration of the ethanoic acid is 1.0 mol/L
The initial concentration of the ethanoic acid is 17.4 mol/L
Follow the steps below to find the volume of the ethanoic acid
Step 1; Apply the dilution formula
\(\text{ C1 V1 = C2V2}\)Step 2; Substitute the given data into the formula
\(\begin{gathered} \text{ 17.4 }\times\text{ V1 = 4.5 }\times\text{ 1.0} \\ \text{ 17.4 V1 = 4.5} \\ \text{ Divide both sides by 17.4} \\ \text{ V1 = }\frac{\text{ 4.5}}{\text{ 17.4}} \\ \text{ V1 = 0.260L} \\ \text{ V1 = 260mL} \end{gathered}\)Therefore, the initial volume of the acid is 260mL
the ______ heat capacity of a substance is the amount of heat needed to change the temperature of 1 mol of that substance by ___ K
Answers
The molar heat capacity of a substance is the amount of heat needed to change the temperature of 1 mol of that substance by 1 K.
The molar heat capacity of a substance is a physical property that describes the amount of heat energy required to raise the temperature of one mole of the substance by one Kelvin (or one degree Celsius). It is typically denoted by the symbol Cm and has units of joules per mole per Kelvin (J/(mol K)).
The molar heat capacity of a substance depends on various factors such as the nature of the substance, its phase (solid, liquid, or gas), and the conditions under which the temperature change occurs (constant pressure or constant volume).
For example, the molar heat capacity of a gas at constant pressure is usually greater than its molar heat capacity at constant volume, because the gas is allowed to expand and do work on its surroundings at constant pressure, which requires additional energy input.
The molar heat capacity is an important property in thermodynamics and is used in many calculations involving heat transfer, energy conversion, and chemical reactions. It is also used to determine the specific heat capacity of a substance, which is the amount of heat energy required to raise the temperature of a unit mass of the substance by one Kelvin (or one degree Celsius).
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The line "Come, I will make the continent indissoluble" from "For You O Democracy" implies democracy will make the nation stronger than ever before. Given this, what is most likely the meaning of indissoluble?.
Answers
Answer:
Permanent
Explanation:
I took the text
If you need an object to move a further distance, how would you adjust the force?
Answers
Answer:
slingshot or throw it
Explanation:
name as many tv shows as you can!!!
if u name more than 10 you get brainilest!!
Answers
Answer:
Vampire diaries Freinds Twilight My little pony Thats it
Explanation:
Answer:
spongebob square pants
family guy
american dad
the cleveland show
teen titans go
robot chicken
the loud house
the Cassandras
the big bang theory
steven universe
Explanation:
when the temperature of the equilibrium mixture is decreased, does the equilibrium shift to the right, favoring the product, or to the left, favoring the reactants? justify your answer.
Answers
When the temperature of the equilibrium mixture is decreased, the equilibrium shifts to the left, favoring the reactants. This is known as Le Chatelier's Principle.
What is Le Chatelier's principle?
Le Chatelier's principle states that when a system at equilibrium is subjected to a change in temperature, pressure, or concentration of reactants or products, it shifts its equilibrium position to oppose the change. The principle is named after Henry Louis Le Chatelier, a French chemist.
What happens when the temperature is decreased?
An endothermic reaction absorbs energy in the form of heat, causing an increase in temperature to shift the equilibrium to the right, while a decrease in temperature shifts the equilibrium to the left. In contrast, an exothermic reaction releases energy in the form of heat.
As a result, a decrease in temperature shifts the equilibrium to the right and an increase in temperature shifts the equilibrium to the left. To summarize, when the temperature of the equilibrium mixture is decreased, the equilibrium shifts to the left, favoring the reactants.
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Again with the questions from my test, all help is appreciated.
Answers
Answer:
The atomic number will remain the same because a proton has a positive charge and a electron has a negative charge so they would cancel each other out
why is chemistry important in cars
Answers
Is soapy water water good for plant irrigation (give answer in accordance to chemistry)?
Answers
Answer:
soapy water is not good for plants irrigation that is what I learn
Answer:
Soapy water is not good for plant irrigation because soapy water contains sulphate in it which is not good for the development of plants.
Explanation:
hope this helps
Write the correct abbreviation for each metric unit.
1) Kilogram __ 4) Milliliter __ 7) Kilometer __ 2) Meter 5) Millimeter __
8) Centimeter __ 3) Gram __ 6) Liter __ 9) Milligram __
Answers
The correct abbreviation for each metric unit is:
Kilogram - kg, Milliliter - ml, Kilometer- Km, Meter- m, Millimeter - mm, Centimeter - cm, Gram - g, Liter - L, and Milligram - mg.
What is the metric system?The metric system can be described as a system of measurement that succeeded the decimalized system based on the meter. Each of the fundamental dimensions can be expressed by a single base unit of measure.
For quantities derived from the base units of the system, units derived from the base units are used such as the square meter being the derived unit for the area, a quantity derived from length.
Metric units can be described as units based on the meter, gram, or second and decimal multiples or sub-multiples of these. The units of the International System of Units (SI). By extension, they involve units of electromagnetism from the CGS units and SI units systems.
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The osmotic pressure of a solution containing 15. 87 mg of an unknown protein per 10. 0 mL of solution is 2. 45 torr at 25oC. Find the molar mass of the unknown protein
Answers
After calculation and analyzing the molar mass of the unknown protein is
103.92g/mol.
the formula for the molar mass is
Π = i x M x R x T
here,
Π = osmotic pressure
i = van't Hoff factor
M = molarity
R = constant
T = temperature
therefore, staging the given values into the formula we get
2.45 = 1 x M x 62.3637
M = 0.000104mol/L
now the molar mass of the protein is
molar mass = mass/ moles
given
15.87 gm of protein in 10ml
then,
0.01587 g of protein in 10 ml
restructuring the formula concerning moles
moles = mass/molar mass
0.01587 / 0.000104
= 0.153 mol/L
hence, the molar mass of the unknown protein is
molar mass = 0.01587/0.153
molar mass = 103.92 g/mol
After calculation and analyzing the molar mass of the unknown protein is
103.92g/mol.
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Can someone please help me quickly!!!
Answers
Answer:
Mercury
Explanation: Under standard conditions mercury is a shiny, heavy, silvery liquid. It is the only metal that is liquid at room temperature.
Answer:
Mercury, Venus, earth and mar, Jupiter, Saturn, urines, Neptune.
Explanation:
11. (03.03 MC)
What best describes the bonding in a water molecule? (5 points)
O An oxygen atom shares an electron pair with each H atom.
O An oxygen atom shares a single electron with each H atom.
) An oxygen atom receives an electron from each H atom.
O An oxygen atom transfers an electron to each H atom.
Answers
Answer:
A) An oxygen atom shares an electron pair with each H atom.
Explanation:
Moving to another question will save this response. Question 7 140 Ba has a half-life of 283.2 hours. How long would it take for 35 mg of 140 OA. 1452.6 hours OB. 9912.0 hours OC. 1006.9 hours D. 3.6 hours Ba in a sample to decay to 1.0 mg? TY NA
Answers
The total time required for the decay is approximately 1416.0 hours, which is closest to the given option C. 1006.9 hours.
Option (C) is correct.
To calculate the number of half-lives required for the decay. The half-life of 140 Ba is given as 283.2 hours.
First, we calculate the fraction of the original amount remaining after each half-life. Since the half-life represents the time it takes for half of the substance to decay, the fraction remaining after each half-life is 1/2.
To find the number of half-lives required to decay from 35 mg to 1.0 mg, we can set up the following equation:
(35 mg) * (1/2)ⁿ = 1.0 mg
Where 'n' is the number of half-lives.
Now, let's solve for 'n':
(1/2)ⁿ = 1.0 mg / 35 mg
(1/2)ⁿ = 0.02857
To find 'n', we can take the logarithm (base 1/2) of both sides:
n = log base 1/2 (0.02857)
Using the logarithmic property, we know that log base a (b) = log base c (b) / log base c (a):
n = log (0.02857) / log (1/2)
Using a calculator, we can find:
n ≈ 4.243
Since 'n' represents the number of half-lives, and we usually round up to the nearest whole number for half-life calculations, we get:
n ≈ 5
Therefore, it would take approximately 5 half-lives for the 35 mg sample of 140 Ba to decay to 1.0 mg.
To calculate the total time required, we multiply the half-life by the number of half-lives:
Total time = 283.2 hours * 5
Total time ≈ 1416 hours
Rounding to one decimal place, the total time required for the decay is approximately 1416.0 hours, which is closest to the given option C. 1006.9 hours.
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What are the function of the cytokinesis hormone in plant's. Choose the correct answer
A ) ! ck jd pyk v zc !
B ) ! ck jd pyk v zc !
Answers
These are some of the important functions of the cytokinesis hormone in plants :-
Cytokinesis is a group of growth regulators that is found in plants. It helps in performing cell divison of plant roots, and shoot system. It also helps in promoting the cell's growth, development, flowering, and seed formation.
It helps in the protein production which is important for mitosis. It provides resistance against certain diseases causing bacteria in crops. It mainly contains Nitrogen, Hydrogen, and a few atoms of oxygen in its structure.
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The options for the function of cytokinesis should be:
(A) performing cell division in plant roots
(B) shoot system
(C) promoting the cell’s growth, development
(D) All of these
Answer - (D) All of these
An object with a negative acceleration could NEVER have a positive velocity. a. TRUE b. FALSE
Answers
Answer:false
Explanation:
Will give.brainliest.
the pH scale describes the negative log of the percent _____
ion in a solution
Answers
Answer:
The pH of a solution is the negative logarithm of the hydrogen-ion concentration. The pH of pure water or any neutral solution is thus 7.00.
Explanation:
Answer:
hydrogen concentration
Explanation:
chegg You add a sprinkle of sugar (non-volatile solute) to a beaker of water; the vapor pressure of the solution, compared to the vapor pressure of the pure solvent before the sugar was added, will:
Answers
If a non-volatile sugar is added to water , the vapor pressure of liquid will tend to decreases and this reduction of vapor pressure is said to be proportional to the numbers of mole fraction of solute that was added to it.
What occurs when a non volatile solute is added to a solution?In the case above, the vapor pressure of the solution is known to be lowered if compared to the vapor pressure of the pure solution.
Therefore if a non-volatile solute is said to be place or added to a pure solution such as water, the vapor pressure of the solution will be reduced than that of the pure solution.
Hence, the statement that If a non-volatile sugar is added to water , the vapor pressure of liquid will tend to decreases and this reduction of vapor pressure is said to be proportional to the numbers of mole fraction of solute that was added to it is correct.
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Chlorine is a non-metal in Group 7. This tells us that it will produce ions that have a charge of... what?
Answers
Answer: Ok
Explanation:
Chlorine is in Group 7 of the periodic table. Therefore a chlorine atom has 7 electrons in its outer shell. this atom needs one more electron to form an ion with a full outer shellChlorine is in Group 7 of the periodic table. Therefore a chlorine atom has 7 electrons in its outer shell. this atom needs one more electron to form an ion with a full outer shell
Molar mass of Fe2O3 = g/mol
Answers
Answer:
159.6882 grams
Explanation:
A salt solution contains ammonium cation (ka = 5.7 × 10^–10) and nitrite anion (kb = 1.4 × 10^–11) in equal proportions. The ph of the solution will be?
Answers
The ph of the solution will be acidic. It is because of the higher ka value of ammonia as compared to kb of nitrate
As we know, A salt solution contains ammonium cation (ka = 5.7 × 10^–10) and nitrite anion (kb = 1.4 × 10^–11) in equal proportions but the ka and kb are different.
As we see that the value of ka is higher than the kb that's why the ph level will be acidic.
Acidic solutions are sour in taste as compared to alkaline solutions.
We know that the ph scale basically ranges from 0 to 14. The ph solutions less than 7 are acidic and greater than 7 are basic.
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How many grams are there in 8.25 L of oxygen gas (O2)
hey guys show work I don't know what's going on... also does the number 22.4 have to be in there somehow???? send help
Answers
There are approximately 11.78 grams of oxygen gas (O2) in 8.25 L at STP.
What is the mass of 8.25L of oxygen at STP?
To calculate the number of grams of oxygen gas (O2) in 8.25 L, we need to use the ideal gas law which states:
PV = nRT
Where;
P is the pressure of the gas, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature.Assuming standard temperature and pressure (STP) conditions (0°C and 1 atm), we can use the molar volume of a gas at STP, which is 22.4 L/mol, to calculate the number of moles of oxygen gas in 8.25 L:
n = (V / V_m) = (8.25 L) / (22.4 L/mol) = 0.3683 mol
The molar mass of O2 is approximately 32 g/mol, so we can calculate the number of grams of oxygen gas in 0.3683 mol:
mass = n x molar mass = 0.3683 mol x 32 g/mol = 11.78 g
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answer the pic below
Answers
Answer: 18
Explanation:
i think so
The Sun is made up of approximately 75% hydrogen and 25%
Answers
Answer:
The Sun, like others stars, is a ball of gas. In terms of the number of atoms, it is made of 91.0% hydrogen and 8.9% helium. By mass, the Sun is about 70.6% hydrogen and 27.4% helium.
Explanation:
helium is probs ur answer!