Convert mole to gram by multiplying the molar mass of sodium
0.500mol Na x 22.990g = 11.495g of Na
c) Discuss precision and Accuracy as they relate to types of errors.
what is the answer
Precision relates to the consistency and reproducibility of measurements, while accuracy reflects how close measurements are to the true value.
Precision and accuracy are two important concepts in the context of errors in measurements. While they both pertain to the quality of data, they refer to different aspects.
Precision refers to the degree of consistency or reproducibility in a series of measurements. It reflects the scatter or spread of data points around the average value. If the measurements have low scatter and are tightly clustered, they are considered precise. On the other hand, if the measurements have a high scatter and are widely dispersed, they are considered imprecise.
Accuracy, on the other hand, refers to the closeness of measurements to the true or target value. It represents how well the measured values align with the actual value. Accuracy is achieved when measurements have a small systematic or constant error, which is the difference between the average measured value and the true value.
Errors in measurements can be classified into two types: random errors and systematic errors.
Random errors are associated with the inherent limitations of measurement instruments or fluctuations in the measurement process. They lead to imprecise data and affect the precision of measurements. Random errors can be reduced by repeating measurements and calculating the average to minimize the effect of individual errors.
Systematic errors, on the other hand, are caused by consistent biases or inaccuracies in the measurement process. They affect the accuracy of measurements and lead to a deviation from the true value. Systematic errors can arise from factors such as instrumental calibration issues, environmental conditions, or experimental techniques. These errors need to be identified and minimized to improve the accuracy of measurements.
In summary, precision refers to the degree of consistency or reproducibility of measurements, while accuracy refers to the closeness of measurements to the true value. Random errors affect precision, while systematic errors affect accuracy. To ensure high-quality measurements, both precision and accuracy need to be considered and appropriate techniques should be employed to minimize errors.
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What happens to water particles when they are heated? Select the box if the sentence is true. Leave the box blank if it is NOT. *
5 points
The speed of the water particles increases.
The size of the water particles increases.
The number of water particles increases.
The space between the water particles increases.
The number of collisions between water particles increases.
Answer:
The speed of the water particles increases.
The number of collisions between water particles increases.
Explanation:
When water particles are heated, the speed of the particles increases and the number of collisions between the water particles also increases.
Heating increases the thermal energy of the system When water particles gain more thermal energy, their average speed increases drastically. Also, the frequency of collisions increases due to the gain in thermal energy of the system.6 Describe What types of atoms release nuclear
radiation?
Answer:
isotopes of elements with unstable nucleus releases nuclear radiation. generally the instability is related to the neutron to proton ratio in the nucleus of an atom
The procedure calls for 2.00 mL of the liquid reactant, 2,4-pentanedione, to be used in the reaction. It has a density of 0.975 g/mL. How many grams of this reactant will be used in the reaction
It will be used 1.95 grams of the reactant in the reaction.
DensityTo calculate the density of a given substance, use the following expression:
\(d = \frac{m}{v}\)
Thus, having the values of volume and density, just apply the formula above to find the value of mass, so that:
\(0.975 = \frac{m}{2}\)
\(m= 1.95 grams\)
So, it will be used 1.95 grams of the reactant in the reaction.
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How are electricity and magnetism related?
Moving magnets can make electrical currents.
Electricity can create a magnetic field.
Electricity and magnetism are not related.
Protons and electrons are repelled by magnets.
Need help now this work is due by 5:00
Answer: Electricity and magnetism are essentially two aspects of the same thing, because a changing electric field creates a magnetic field, and a changing magnetic field creates an electric field.
Answer:How are electricity and magnetism related?
Moving magnets can make electrical currents.
Electricity and magnetism are not related.
Protons and electrons are repelled by magnets.How are electricity and magnetism related?
Moving magnets can make electrical currents.
Electricity and magnetism are not related.
Protons and electrons are repelled by magnets.How are electricity and magnetism related?
Moving magnets can make electrical currents.
Electricity and magnetism are not related.
Protons and electrons are repelled by magnets.
Explanation:
1. Write the IUPAC names for the following 1.1 1.2 N 1.3 O NO2 x Y ·0 OH 5
1. The IUPAC name of N is nitrogen.
2. Nitrogen dioxide
3.The IUPAC name of O is oxygen
4.The IUPAC name of OH is hydroxyl.
The IUPAC name of ·0 is a radical. It is commonly found in organic chemistry and plays an important role in many reactions.
IUPAC names for the given compounds are:1.1. N: Nitrogen
The IUPAC name of N is nitrogen.
It is a non-metal and belongs to group 15 in the periodic table. It has an electronic configuration of 1s2 2s2 2p3.1.2. NO2: Nitrogen dioxide
Explanation: NO2 is a chemical compound that is formed by the combination of nitrogen and oxygen. It is a reddish-brown gas that has a pungent odor.
The IUPAC name of NO2 is nitrogen dioxide.1.3. O: Oxygen
Explanation: The IUPAC name of O is oxygen.
It is a non-metal and belongs to group 16 in the periodic table. It has an electronic configuration of 1s2 2s2 2p4.
X: UnknownExplanation: No IUPAC name can be given to an unknown compound as the structure and composition are not known.
Y: Hydroxyl Explanation: The IUPAC name of OH is hydroxyl.
It is a functional group that is composed of an oxygen atom and a hydrogen atom (-OH). It is commonly found in alcohols and phenols. ·0: RadicalExplanation: A radical is a molecule or an ion that contains an unpaired electron.
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Note: The complete question is given below
Provide the IUPAC names for the following compounds:
\(CH_3CH_2CH(CH_3)CH_2CH_2CH_2CH_3\)
C6H5CH(CH3)2
H2NCH2CH2CH2CH2CH2NH2
CH3CH2CH2CH2CH2OH
CH3CH2CH2CHOHCH3
СH +
О, –
СО, +
НО
What is the balancing equation
Answer:
i would also like to know
Explanation:
plz..............................................
Shown above is the phase diagram for water as it is heated. Which section represents the phase of water with the highest kinetic energy?
The section that represents the phase of water with the highest kinetic energy is the gas phase or vapor phase.
Gas phase or vapor phase section is above the boiling point curve, which separates the liquid and gas phases. At this point, the temperature is at or above 100°C (at standard atmospheric pressure), and the kinetic energy of the water molecules is sufficient to overcome the intermolecular forces holding them in the liquid phase and escape into the gas phase. The gas phase has the highest kinetic energy because the water molecules in this phase are more widely separated and move more rapidly than in the liquid or solid phases. The gas phase is also characterized by the highest entropy or disorder, as the molecules are free to move in any direction and occupy a large volume. The section that represents the phase of water with the highest kinetic energy is gas phase or vapor phase.
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Which subatomic particle is directly involved in the bonding of atoms
Answer:
electrons
Explanation:
Of the three subatomic particles, electrons are most involved in forming chemical bonds.
6) 0.5 moles of gas is kept at 2.0 L of volume and 0.75 atm of pressure. What is the temperature of the gas in K?
Answer:
310K
Explanation:
Rearrange PV=nRT to get T=PV/nR
T=(2.0L)(0.75atm)/(0.5mol)(0.08206)
=36.5 or 37
add 273 for K to get
310
What is internal pressure?
Net ionic equation for potassium sulfide and magnesium iodide
The net ionic equation for the reaction between potassium sulfide and magnesium iodide is S2- + Mg2+ -> MgS, as the potassium and iodide ions are spectator ions and do not participate in the reaction.
To determine the net ionic equation for the reaction between potassium sulfide (K2S) and magnesium iodide (MgI2), we first need to identify the ions present in each compound and then determine the products formed when they react.
Potassium sulfide (K2S) dissociates into two potassium ions (K+) and one sulfide ion (S2-):
K2S -> 2K+ + S2-
Magnesium iodide (MgI2) dissociates into one magnesium ion (Mg2+) and two iodide ions (I-):
MgI2 -> Mg2+ + 2I-
Now, we need to determine the possible products when these ions combine. Since potassium (K+) has a +1 charge and iodide (I-) has a -1 charge, they can combine to form potassium iodide (KI):
K+ + I- -> KI
Similarly, magnesium (Mg2+) and sulfide (S2-) can combine to form magnesium sulfide (MgS):
Mg2+ + S2- -> MgS
Now, we can write the complete ionic equation by representing all the ions present before and after the reaction:
2K+ + S2- + Mg2+ + 2I- -> 2KI + MgS
To obtain the net ionic equation, we remove the spectator ions, which are the ions that appear on both sides of the equation and do not participate in the actual reaction. In this case, the spectator ions are the potassium ions (K+) and the iodide ions (I-).
Thus, the net ionic equation for the reaction between potassium sulfide and magnesium iodide is:
S2- + Mg2+ -> MgS
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A speed boat, at full throttle, can go 65.0 miles in 1.5 hours. What is the average speed of the boat?
The average speed = 43.33 miles per hours(mph)
Further explanationGiven
distance = 65 miles
time = 1.5 hours
Required
The average speed
Solution
The average speed : distance traveled divided by time taken or total distance divided by total elapsed time
Can be formulated :
avg speed = distance : time
avg speed = d : t
Input the value :
avg speed = 65 miles : 1,5 hours
avg speed = 43.33 miles per hours(mph)
Which of the following statements best describes the number of neutrons in an atom?
It is the same as the element's atomic number.
It is equal to the sum of atomic number and average atomic mass.
it is the same as the average atomic mass.
it is equal to the difference between atomic number and atomic mass number.
Answer:
its the last one
Explanation:
How did the US government change its policy toward Native American land during the 1850s?
They began to designate all land on the Great Plains as reservation land
They created new treaties and reservations that defined specific boundaries for each tribe
They began to allow Native Americans to hunt on their traditional lands
The started forbidding settlers from claiming any land on the Great Plains
Reduced grazing lands
• Hunting for sport and
Answer:
The correct answer is B) They created new treaties and reservations that defined specific boundaries for each tribe
Explanation:
One of such acts which was used to reallocate the Native American Land was the General Allotment (Dawes) Act of 1887.
It gave permission to the Federal Government to modify the size and ownership structure of land belonging to the Native Americans. The end result was that the total amount of land originally belonging to the Native Americans reduced drastically over the next 500 years.
Cheers!
5. Consider the diprotic acid H2A with K1=1.00x104 and K2=1.00x108. Find the pH and concentrations of H2A, HA, and A-2 in 0.20 M of the acid solution.
In a 0.20 M solution of H2A with \(K_1=1.00*10^4\) and \(K_2=1.00*10^8\), the pH is 1.88, and the concentrations of \(H_2A\),\(HA^-\), and\(A^2-\) are approximately \(0.197 M, 2.54*10^{-3} M\), and \(1.95*10^{-15} M\).
To solve this problem, we need to use expressions for the equilibrium concentrations of the species in a diprotic acid:
\([H_2A] = [H_2A]0/(1 + K_1/[H+] + K_1K_2/[H+]^2) \\\)
\([HA^-] = K_1[H_2A]/(1 + K_1/[H+] + K_1K_2/[H+]^2) \\\)
\([A^2-] = K_1K_2[H_2A]/(1 + K_1/[H+] + K_1K_2/[H+]^2)\)
Given \(K_1\) and \(K_2\) values, we can assume that \(K_2\) is much larger than \(K_1\), and thus we can approximate the concentration of \(H_2A\) to be equal to its initial concentration. Therefore, we can simplify the above expressions to:
\([H_2A]\) ≈\([H_2A]0/(1 + K_1/[H+])\)
[HA^-] ≈ \(K_1[H_2A]/(1 + K_1/[H+])\)
\([A^2-]\)≈\(K_1K_2[H_2A]/[H+]^2\)
Substituting the given values:
\([H_2A]\) ≈\(0.20 M/(1 + 1.00*10^4/[H+])\)
[HA^-] ≈ \(1.00*10^4 * 0.20 M/[H+]/(1 + 1.00*10^4/[H+])\)
\([A^2-]\)≈ \(1.00*10^8 * 0.20 M/[H+]^2\)
To find the pH, we can use the equation:
\(pH = -log[H+]\)
After solving the problem iteratively, we get:
pH ≈ 1.88
\([H_2A]\)≈ 0.197 M
[HA^-] ≈ \(2.54*10^{-3} M\)
\([A^2-]\) ≈ \(1.95*10^{-15} M\)
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--The complete Question is, Consider the diprotic acid H2A with K1=1.00x10^4 and K2=1.00x10^8. If you have a 0.20 M solution of this acid, what are the pH and concentrations of H2A, HA, and A-2 in the solution? --
10. What is the molality of a solution
containing 288 g of calcium chloride
dissolved in 2.04 kg of water?
The choice of solution has a concentration of 1.144 mol/kg molality.
What exactly are molality and molarity?Molarity corresponds to the moles of solvent divided by the amount of solution in litres, whereas molality is equal with the moles of solvent divided by the quantity of solvent in kilogrammes.
Is one molarity the same as one molality?Since 1 mole of solute is present in 1 litre for the solution, which contains both the solute and the solvent, 1 molar aqueous solutions are more concentrated than one decays aqueous solutions.
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Which three events occur when earths convection currents move toward each ither
Answer:
- tectonic plates above the currents move toward each other
- one plate will submerge beneath another plate
- a convergent boundary is formed at the site of the collision
Explanation:
Diamond and graphite are two crystalline forms of carbon. At 1 atm and 25°C, diamond changes to graphite so slowly that the enthalpy change of the process must be obtained indirectly. Determine ΔHrxn for
C(diamond) → C(graphite)
with equations from the following list:
(1) C(diamond) + O2(g) → CO2(g) ΔH = −395.4 kJ
(2) 2 CO2(g) → 2 CO(g) + O2(g) ΔH = 566.0 kJ
(3) C(graphite) + O2(g) → CO2(g) ΔH = −393.5 kJ
(4) 2 CO(g) → C(graphite) + CO2(g) ΔH = −172.5 kJ
The enthalpy change of the reaction C(diamond) → C(graphite) is -2.9 kJ.
The given information is ΔHrxn for the reaction C(diamond) → C(graphite) can be calculated with the given equations:Equations: C(diamond) + O2(g) → CO2(g) ΔH = −395.4 kJ 2 CO2(g) → 2 CO(g) + O2(g) ΔH = 566.0 kJ C(graphite) + O2(g) → CO2(g) ΔH = −393.5 kJ 2 CO(g) → C(graphite) + CO2(g) ΔH = −172.5 kJThe required reaction can be obtained by adding the equations (1) and (4), as follows:C(diamond) + O2(g) + 2CO(g) → C(graphite) + 3CO2(g)Addition of the two equations (1) and (4) results in a reaction whose products are C(graphite) and CO2.
To get the final equation that involves only the required reactants and products, the equation (2) should be added, which consumes CO2 and produces O2, as shown below:C(diamond) + O2(g) → CO2(g) ΔH = −395.4 kJ [eq. (1)] 2 CO(g) → C(graphite) + CO2(g) ΔH = −172.5 kJ [eq. (4)] 2 CO2(g) → 2 CO(g) + O2(g) ΔH = 566.0 kJ [eq. (2)] C(diamond) + O2(g) + 2CO(g) → C(graphite) + 3CO2(g) ΔHrxn=ΣΔHf(products)−ΣΔHf(reactants) ΔHrxn=[(3 mol CO2)(-393.5 kJ/mol) + (1 mol C(graphite))(0 kJ/mol)] − [(1 mol C(diamond))(0 kJ/mol) + (1 mol O2)(0 kJ/mol) + (2 mol CO(g))(−172.5 kJ/mol)] − [(2 mol CO2)(566.0 kJ/mol)] ΔHrxn=−2.9 kJ.
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If 2.5 moles of CO2 is made from the reaction, how many moles of h2o is produced?
Answer:
The balanced chemical equation for the reaction of CO2 and H2 to produce H2O and CO is:
CO2 + 4H2 -> CH4 + 2H2O
From the equation, we can see that for every 1 mole of CO2 reacted, 2 moles of H2O are produced. Therefore, if 2.5 moles of CO2 are produced, the number of moles of H2O produced would be:
2.5 moles CO2 * (2 moles H2O / 1 mole CO2) = 5 moles H2O
Therefore, 5 moles of H2O would be produced when 2.5 moles of CO2 is produced.
Examples of nuclear fusion and fission.
Answer: For example, uranium can fission to yield strontium and krypton. Fusion joins atomic nuclei together. The element formed has more neutrons or more protons than that of the starting material. For example, hydrogen and hydrogen can fuse to form helium.
Explanation:
Hope this helped!
Answer:
Explanation:For example, uranium can fission to yield strontium and krypton. Fusion joins atomic nuclei together. The element formed has more neutrons or more protons than that of the starting material. For example, hydrogen and hydrogen can fuse to form helium.
Into a 125 mL Erlenmeyer flask was added some KI and H2SO4 as described in the procedure section of this experiment. Then 3.0 mL of bleach solution was added to the flask and it was immediately titrated with 0.1261 M sodium thiosulfate solution. It required 41.26 mL of this sodium thiosulfate solution to reach the end point of the titration. What is the percentage of NaOCl in the bleach
Answer:
answer is a
Explanation:
i took quiiiiiiz
Unit 5: Stoichiometry Study Guide
1. What is molar mass? How is it calculated? Provide an example,
2. What is percent composition? How is it calculated? Provide an example.
3. 1-step conversions: grams to moles/moles to grams & particles to moles/moles to particles. Give
calculations examples of each
4. 1-step conversion: mole to mole using a balanced chemical equation. Give calculations example
5. 2-step conversions: grams to particles/particles to grams. Give calculations examples of each
6. 3-step conversions using mole bridge map. Give at least two examples of calculations
Answer:
1.Molar mass is the mass of a given substance divided by the amount of that substance, measured in g/mol. For example, the atomic mass of titanium is 47.88 amu or 47.88 g/mol. In 47.88 grams of titanium, there is one mole, or 6.022 x 1023 titanium atoms.
2.Percentage composition of a compound is a ratio of an amount of each element to the total amount of individual elements in a compound, which is then multiplied with 100. Let us take an example of H2O i.e. Water. Water has 2 molecules of hydrogen, and one mole of water is of 18.0152 grams.
Which of the following happens to a molecule of an object when the object is heated? (1 point)
Answer:
They get more energy, so they vibrate!
Explanation:
An atom is chemically stable when it's outer (___) is completely filled with (___).
An atom is chemically stable when it's outer orbit is completely filled with eight electron. An atom is indeed a particle made up of a nucleus.
What is atom?An atom is indeed a particle made up of a nucleus of neutrons and protons surrounding by such an electron cloud. The atom is the fundamental component of the chemical components, as well as the starting materials are characterized by the amount of protons in their atoms.
For example, every atom with 11 protons becomes sodium, while any atom with 29 protons becomes copper. An atom is chemically stable when it's outer orbit is completely filled with eight electron.
Therefore, an atom is chemically stable when it's outer orbit is completely filled with eight electron.
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A 25 ml solution of 0.5 M NaOH is titrated until neutralized into a 50 ml sample of HCl?
The concentration of the acid is \(0.25 M\).
Titration is a laboratory technique used to determine the concentration of a substance in a solution by reacting it with a standardized solution of known concentration.
The titration formula can be given by,
(Volume of the Base) \(\times\) (Normality of the Base) = (Volume of the Acid) \(\times\) (Normality of the Acid)
\(\Rightarrow V_1N_1=V_2N_2\)
Given, the volume of the base (\(NaOH\)), \(V_1 =25 ml\).
The concentration of the base (\(NaOH\)), \(M_1=0.5 M\).
The equivalence of the base (\(NaOH\)) is \(1\).
Hence, the normality of the base (\(NaOH\)), \(N_1=\frac{0.5}{1}N=0.5N\).
Given, the volume of the acid (\(HCl\)), \(V_2 =50 ml\).
Let us assume that the normality of the acid (\(HCl\)) \(N_2\).
Substitute the values in the given formula of titration.
\((25\times0.5)=(50 \times N_2)\\\Rightarrow 12.5=50N_2\\\Rightarrow N_2=\frac{12.5}{50} N\\\Rightarrow N_2=0.25 N\)
Hence, the normality of the acid (\(HCl\)), \(N_2=0.25 N\).
The equivalence of the acid (\(HCl\)) is \(1\).
Therefore, the concentration of the acid, \(M_1=\frac{0.25}{1}=0.25 M\).
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After a morning of cross-country skiing, you return to the chalet and you prepare a good broth.
You pour 250 mL (1g/mL) of broth into a cup at a temperature of 70°C (c = 4.18 J/g•°C).
To avoid burning yourself, you add 50 mL of cold water at 5°C to the cup. What will be the
final broth temperature?
The final broth temperature will be approximately 38.4°C.
When mixing two substances with different temperatures, we can use the principle of conservation of energy. The energy lost by the hot substance (broth) is equal to the energy gained by the cold substance (water), assuming no energy is lost to the surroundings. This can be expressed using the equation:
Q_lost = Q_gained
The energy lost by the broth can be calculated using the formula:
Q_lost = m_broth * c_broth * (T_final - T_initial)
where m_broth is the mass of the broth, c_broth is its specific heat capacity, T_final is the final temperature, and T_initial is the initial temperature of the broth.
Similarly, the energy gained by the water can be calculated using:
Q_gained = m_water * c_water * (T_final - T_initial)
Since the two substances reach thermal equilibrium, we can set Q_lost equal to Q_gained:
m_broth * c_broth * (T_final - T_initial) = m_water * c_water * (T_final - T_initial)
Plugging in the given values and solving for T_final, we find that the final temperature of the broth is approximately 38.4°C.
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Calculate the mass of 100.0 mL of a substance whose density is 19.32 kg/L. Express your answer in kilograms using the correct number of significant figures. Do not enter your answer using scientific notation.
Answer:
1.932 kg
Explanation:
First we convert 100.0 mL to L:
100.0 mL / 1000 = 0.1000 LThen we calculate the mass of the substance, using the definition of density:
Density = mass / volumemass = density * volume19.32 kg/L * 0.1000 L = 1.932 kgAs the multiplication involves two numbers of 4 significant figures each, the answer needs to have 4 significants figures as well.
a hammer has the volume of 11.5 cubic centimeters. it also has the mass of 500 grams. what is the hammer density
Answer:
The answer is 43.48 g/cm³Explanation:
The density of a substance can be found by using the formula
\(density = \frac{mass}{volume} \\ \)
From the question
mass = 500 g
volume = 11.5 cm³
We have
\(density = \frac{500}{11.5} \\ = 43.47826086...\)
We have the final answer as
43.48 g/cm³Hope this helps you
Cars produce carbon dioxide when they burn gasoline. Burning gasoline in transportation
will take you
is one of the leading causes of greenhouse gas emissions. A quarter gallon of gas
about 5 miles in the average car. A quarter gallon of gas is about 1000mL. The molarity of
gasoline is 0.923M. Calculate the mass of bon dioxide produced by a quarter gallon of
gasoline.
Answer:
Explanation:
To calculate the mass of carbon dioxide (CO2) produced by a quarter gallon of gasoline, we'll need the following information:
1. The molar mass of carbon dioxide (CO2): approximately 44.01 grams/mol.
2. The molarity of gasoline: 0.923 M.
3. The volume of gasoline: 1000 mL.
First, we need to convert the volume of gasoline from milliliters (mL) to liters (L):
1000 mL = 1000/1000 = 1 L
Next, we can use the equation relating molarity, volume, and number of moles:
Molarity (M) = Moles (mol) / Volume (L)
Rearranging the equation, we can solve for moles:
Moles (mol) = Molarity (M) * Volume (L)
Moles (mol) = 0.923 M * 1 L = 0.923 mol
Finally, we can calculate the mass of carbon dioxide produced by multiplying the number of moles by the molar mass:
Mass (g) = Moles (mol) * Molar mass (g/mol)
Mass (g) = 0.923 mol * 44.01 g/mol ≈ 40.60 g
Therefore, approximately 40.60 grams of carbon dioxide are produced by burning a quarter gallon of gasoline.