Answer:
valence electrons
Explanation:
i just took the test
a diagram of the electromagnetic spectrum is shown. which wavelength is the longest safest wavelengths for humans？ Helppp pleaseee
Answer:
radio waves
Explanation:
the answer is simple, radio waves. it is radio waves because when you look at the diagram the waves below Radio are very long. if you look at the waves under gamma ray, they are very short. radio is the longest wave while gamma is the shortest. if you are still confused it also says longer wavelength and low frequency( meaning it is safe) right under the wavelength.
Use the spuces prooided for the ansvrs and additional paper f eceosary 1. Compare the densities of your two rubbing alcohol samples a) Were they identical? lf not, why do you think they were d (b) Should these densities have been identical? Briefly explain why or why not. 2. Suppose you had been asked to share your rubber stopper with your laboratory partner. To do this, you cut the stopper into two pieces, and determined the density of your piece. Should you report your experimentally determined density as the density of the stopper, or should you add the density you determined to the one your partner determined, and report this total density? Briefly explain. 3. (a) Suppose that when you added your rubber stopper to the graduated cylinder containing water, some of the water splashed out. Due to this procedural error, would your experimentally determined density of the stopper be erroneously high or erroneously low? Briefly explain. (b) Suppose that after a student added his unknown object to the cylinder containing water, the top of the object remained above the surface of the water. After reading the new water level, he calculated the volume of his object. Would his calculated object volume be correct, too high, or too low? Briefly explain.
(1)The densities of the two rubbing alcohol samples may not be identical. (2)The density of the rubber stopper should not be reported based on the density determined from only one piece. (a) Due to the procedural error of water splashing out when adding the rubber stopper, the experimentally determined density of the stopper would be erroneously low. (b) If the top of an unknown object remains above the water surface, the calculated volume would be too low, as it does not account for the portion of the object above the water level.
The densities of rubbing alcohol samples may differ due to variations in the concentration or impurities present in each sample. Differences in the manufacturing process or storage conditions can result in slight variations in concentration, which can impact the density. Additionally, impurities present in the samples can affect their densities, as different impurities have different molecular masses and structures.
When sharing the rubber stopper, the experimentally determined density of the individual pieces should not be reported as the density of the entire stopper. Instead, the densities determined by both partners should be added together to obtain the total density of the original stopper. This is because cutting the stopper into two pieces alters its overall volume, and reporting the density based on only one piece would not provide an accurate representation of the original stopper's density.
(a) If water splashes out when adding the rubber stopper to the graduated cylinder, the displaced water volume would be erroneously low. This would result in a lower overall density calculation for the stopper since density is calculated by dividing mass by volume. Therefore, the experimentally determined density of the stopper would be erroneously low.
(b) If the top of an unknown object remains above the water surface, the calculated volume would be too low. The volume of an object should include its entire submerged portion to obtain an accurate measurement. As the portion above the water surface is not accounted for, the calculated volume would underestimate the actual volume, leading to a calculated object volume that is too low.
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help me please
ive been here for hours
Answer:
A- Before the mechanic left, the molecules were moving away from each other. When she returned, they were moving around each other.
Explanation:
Brainliest?
List the elements and the amounts of each element below for 5 Li2S04.
Answer:
Lithium has 5 elements, sulphur has 2 elements and oxygen has 4 elements
11. Why does cotton absorb so much water?
a. Cotton is adhesive to the water molecules
b. The polarity of water allows it to dissolve cotton.
C. Cotton has hollow fibers that absorb by capillary action
d. Cotton is cohesive to the cotton fibers
Answer:
c
Explanation:
what is the ph at the equivalence point when 35.0 ml of a 0.200 m solution of acetic acid (ch3cooh) is titrated with 0.100 m naoh to its end point?
The pH at the equivalence point when 35.0 mL of a 0.200 M solution of acetic acid (CH3COOH) is titrated with 0.100 M NaOH to its end point is 4.76.
The pH at the equivalence point when 35.0 mL of a 0.200 M solution of acetic acid (CH3COOH) is titrated with 0.100 M NaOH to its end point can be calculated using the formula derived from the Henderson-Hasselbalch equation.
The balanced chemical equation for this reaction is as follows: CH3COOH + NaOH → CH3COONa + H2OSince the reaction between the acetic acid and sodium hydroxide is a 1:1 ratio, the number of moles of NaOH required to reach the equivalence point will be equal to the number of moles of CH3COOH present in the 35.0 mL solution of 0.200 M acetic acid.
This can be calculated using the following formula: moles of CH3COOH = M x V moles of CH3COOH = 0.200 M x 0.0350 L = 0.00700 mol of CH3COOHTo calculate the volume of NaOH required to reach the equivalence point, we can use the formula: moles of NaOH = moles of CH3COOHmoles of NaOH = 0.00700 mol of CH3COOHNow that we know the number of moles of NaOH, we can calculate the volume of NaOH required to reach the equivalence point using the following formula: V = n / CV = 0.00700 mol / 0.100 M = 0.0700 L = 70.0 mL.
Since we have added 70.0 mL of 0.100 M NaOH to the 35.0 mL of 0.200 M acetic acid solution, the total volume of the solution at the equivalence point is: Vtotal = 35.0 mL + 70.0 mL = 105.0 mL. Now that we have determined the volume and concentration of the NaOH solution required to reach the equivalence point, we can use the Henderson-Hasselbalch equation to calculate the pH at the equivalence point: pH = pKa + log([A-]/[HA])At the equivalence point, the concentration of CH3COOH and CH3COO- are equal.
Therefore, the concentration of [HA] and [A-] are equal, and we can simplify the equation to:pH = pKa + log(1)Since the pKa of acetic acid is 4.76, we can substitute this value into the equation and solve for pH:pH = 4.76 + log(1)pH = 4.76.
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26) Is the constant speed that a falling object eventually reaches when air 3 points
resistance builds up and prevents further acceleration *
Speed of Gravity
Terminal Velocity
Acceleration
Drag speed
Answer:
terminal velcity
Explanation:
Question 2
1 pts
Which of the following best describes what families/groups of elements have in common?
O Same number of electrons
O Same number of valence electrons
O Same number of electron shells
O Same number of protons
U
Question 3
1 pts
3Al + 3 NH4ClO4 ---> Al2O3 + AlCl3 + 3 NO + 6H20
How many liters of nitrogen monoxide (NO) are formed by completely reacting 50.0 grams of ammonium perchlorate (NH4C104)?
Answer:
9.63 L of NO
Explanation:
We'll begin by calculating the number of mole in 50.0 g of NH₄ClO₄. This can be obtained as follow:
Mass of NH₄ClO₄ = 50 g
Molar mass of NH₄ClO₄ = 14 + (4×1) + 35.5 + (16×4)
= 14 + 4 + 35.5 + 64
= 117.5 g/mol
Mole of NH₄ClO₄ =?
Mole = mass /molar mass
Mole of NH₄ClO₄ = 50/117.5
Mole of NH₄ClO₄ = 0.43 mole
Next, we shall determine the number of mole of NO produced by the reaction of 50 g (i.e 0.43 mole) of NH₄ClO₄. This can be obtained as follow:
3Al + 3NH₄ClO₄ –> Al₂O₃ + AlCl₃ + 3NO + 6H₂O
From the balanced equation above,
3 moles of NH₄ClO₄ reacted to produce 3 moles of NO.
Therefore, 0.43 mole of NH₄ClO₄ will also react to produce 0.43 mole of NO.
Finally, we shall determine the volume occupied by 0.43 mole of NO. This can be obtained as follow:
1 mole of NO = 22.4 L
Therefore,
0.43 mole of NO = 0.43 × 22.4
0.43 mole of NO = 9.63 L
Thus, 9.63 L of NO were obtained from the reaction.
Lymph nodes are...
A. bean shaped.
B. circular.
C. carrot shaped.
D. asparagus shaped.
Answer:
a
Explanation:
Calculate the theoretical values for delta S and delta G for the following dissolution reaction of calcium chloride in water using values from the thermodynamic tables in the textbook.
CaCl2(s) --> Ca2+ (aq) + 2Cl- (aq)
The theoretical values for ΔS and ΔG for the dissolution reaction of calcium chloride in water are approximately:
ΔS = 401.0 J/(mol·K)
ΔG = -343.6 kJ/mol
The standard molar entropy values (ΔS°) at 298 K (25°C) are as follows:
ΔS°(CaCl₂(s)) = 115.3 J/(mol·K)
ΔS°(Ca²⁺(aq)) = 72.1 J/(mol·K)
ΔS°(2Cl⁻(aq)) = 222.1 J/(mol·K)
The standard Gibbs free energy change (ΔG°) at 298 K (25°C) is given by the equation:
ΔG° = ΣnΔG°(products) - ΣnΔG°(reactants)
The standard Gibbs free energy change values (ΔG°) at 298 K (25°C) are as follows:
ΔG°(CaCl₂(s)) = -795.4 kJ/mol
ΔG°(Ca²⁺(aq)) = -544.6 kJ/mol
ΔG°(2Cl⁻(aq)) = -167.2 kJ/mol
For the dissolution reaction of CaCl₂ in water:
CaCl₂(s) → Ca²⁺(aq) + 2Cl⁻(aq)
To calculate the theoretical values of ΔS and ΔG, we use the stoichiometric coefficients of the balanced equation. The stoichiometric coefficients for the products and reactants are as follows:
n(Ca²⁺) = 1
n(Cl⁻) = 2
Calculating the values:
ΔS°(reaction) = ΣnΔS°(products) - ΣnΔS°(reactants)
= (1 * ΔS°(Ca²⁺(aq))) + (2 × ΔS°(Cl⁻(aq))) - ΔS°(CaCl₂(s))
Substituting the values:
ΔS°(reaction) = (1 × 72.1 J/(mol·K)) + (2 × 222.1 J/(mol·K)) - 115.3 J/(mol·K)
= 401.0 J/(mol·K)
ΔG°(reaction) = ΣnΔG°(products) - ΣnΔG°(reactants)
= (1 × ΔG°(Ca²⁺(aq))) + (2 × ΔG°(Cl⁻(aq))) - ΔG°(CaCl₂(s))
Substituting the values:
ΔG°(reaction) = (1 × -544.6 kJ/mol) + (2 × -167.2 kJ/mol) - (-795.4 kJ/mol)
= -343.6 kJ/mol
Therefore, the theoretical values for ΔS and ΔG for the dissolution reaction of calcium chloride in water are approximately:
ΔS = 401.0 J/(mol·K)
ΔG = -343.6 kJ/mol
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A gaseous mixture containing 1.5 mol of Ar and 3.5 mol of CO2 has a total pressure of 7.0 atm . What is the partial pressure of CO2.
Answer:
4.9 atm
Explanation:
Given:
Total pressure = 7.0 atm
(Total number of moles)=[ (1.5 mol arg) + (3.5 mol co2) ]
= 5 moles
Let Partial pressure of CO2 gas = P(CO2)
✓✓partial pressure of CO2 can be calculated using below expresion.
P(CO2) / Total pressure = (moles of CO2 gas) / Total number of moles
✓✓ Let us substitute the values into the above expresion.
[P(CO2) / 7.0 atm ] = [3.5 mol / 5 moles]
P(CO2)= [7 atm × 3.5 moles] / [5 moles]
= 4.9 atm
Hence, the partial pressure of CO2 is 4.9 atm
Answer:
Partial pressure of CO₂ = 4.9 atm
Explanation:
From the question given above, the following data were obtained:
Mole of Ar = 1.5 moles
Mole of CO₂ = 3.5 moles
Total pressure (Pₜ) = 7.0 atm
Partial pressure of CO₂ =?
Next, we shall determine the mole fraction of CO2. This can be obtained as follow:
Mole of Ar = 1.5 moles
Mole of CO₂ = 3.5 moles
Total mole = 1.5 + 3.5
Total mole = 5 mole
Mole fraction of CO₂ = mole of CO₂ / total mole
Mole fraction of CO₂ = 3.5 / 5
Mole fraction of CO₂ = 0.7
Finally, we shall determine the partial pressure of CO₂. This can be obtained as follow:
Total pressure (Pₜ) = 7.0 atm
Mole fraction of CO₂ = 0.7
Partial pressure of CO₂ =?
Partial pressure of CO₂ = mole fraction of CO₂ × total pressure
Partial pressure of CO₂ = 0.7 × 7
Partial pressure of CO₂ = 4.9 atm
explain why your dilute solution of naoh needs to be standardized
A dilute solution of NaOH needs to be standardized in order to accurately determine its concentration. Standardization involves comparing the concentration of the NaOH solution to a known concentration of a primary standard substance.
There are several reasons why standardization is necessary. Firstly, NaOH is highly hygroscopic, meaning it readily absorbs moisture from the air. This moisture absorption can alter the concentration of the solution over time, leading to inaccurate results. By standardizing the NaOH solution, we can ensure that its concentration is accurately determined at a specific point in time. Secondly, during the manufacturing and storage process, impurities may be introduced into the NaOH solution, affecting its concentration. Standardization allows us to account for these impurities and determine the true concentration of the solution. Lastly, dilution of the NaOH solution introduces a potential for errors in the preparation process, such as inaccuracies in volumetric measurements. Standardization helps correct for these errors and provides a reliable concentration value for subsequent use in various analytical procedures.
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Which element, when it gains two electrons, will have the electron configuration 1s22s22p63s23p64s 23d104p65 Select the correct answer below: a) S. b) Se. c) Kr. d) Te.
The required correct answer is option D) Te.
An atom of Tellurium (Te) has 52 electrons and its electron configuration is 1s22s22p63s23p64s23d104p65s24d105p4. It has six electrons in its outermost shell and it requires two more electrons to complete its octet. Upon gaining two electrons, the electron configuration of Te will become 1s22s22p63s23p64s23d104p65s24d105p6.Te (Tellurium) is a chemical element with an atomic number of 52. It is a rare, silvery-white metalloid that is widely used in various industries. The majority of tellurium is used in alloys and as an additive to copper, steel, and lead to increase their strength and durability. It's also used in the production of solar panels and other electronic devices.
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Which of the following nuclides has the largest nuclear binding energy per nucleon? O 44 Ca 20 206 Pb 82 {Li 58 28 5 Ni 138 56 Ba
The correct answer is 5 Ni 138 56.
Explanation :
The nucleotide which has the largest nuclear binding energy per nucleon is nickel-56 (56Ni). It is important to note that nuclear binding energy per nucleon refers to the energy released when a nucleus is formed by assembling its nucleons.
The nuclear binding energy is the amount of energy required to separate an atomic nucleus into its individual nucleons. It is the sum of the energy of the individual nucleons in the nucleus. It's important to remember that when atomic nuclei are formed, they release a certain amount of energy in the process.
The nuclear binding energy per nucleon depends on the total number of nucleons present. In general, the larger the number of nucleons in an atomic nucleus, the greater the amount of nuclear binding energy per nucleon.
Therefore, among the given nucleotides, nickel-56 (56Ni) has the largest nuclear binding energy per nucleon. The amount of energy released when nickel-56 (56Ni) is formed is greater than that released by any other nuclide. The high energy released by nickel-56 (56Ni) makes it important for the process of nuclear fusion in stars.
Thus, the answer to this question is nickel-56 (56Ni).
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When excess water is added to 0.50 g of Mg3N2(s), 3.4 kJ are released as the reaction below occurs at standard state conditions. Find H˚ for the reaction
½ Mg3N2(s) + 3H2O(l) ½ Mg(OH)2 (s) + NH3(g)
The ∆H° for the reaction [tex]1/2 Mg_3N_2(s) + 3H_2O(l)[/tex]→[tex]1/2 Mg(OH)_2 (s) + NH_3(g)[/tex] is approximately -1372.54 kJ/mol
To calculate the ∆H° for the reaction[tex]1/2 Mg_3N_2(s) + 3H_2O(l)[/tex] → [tex]1/2 Mg(OH)_2 (s) + NH_3(g)[/tex], we need to use the given information that 3.4 kJ of energy are released when excess water is added to 0.50 g of Mg3N2(s).
First, let's calculate the moles of [tex]Mg_3N_2[/tex](s):
Molar mass of [tex]Mg_3N_2[/tex] = 3 * molar mass of Mg + 2 * molar mass of N
Molar mass of [tex]Mg_3N_2[/tex] = 3 * 24.31 g/mol + 2 * 14.01 g/mol = 100.95 g/mol
Moles of [tex]Mg_3N_2[/tex](s) = Mass / Molar mass
Moles of [tex]Mg_3N_2[/tex](s) = 0.50 g / 100.95 g/mol = 0.004955 mol
Next, we can determine the ∆H° per mole of [tex]Mg_3N_2[/tex](s):
∆H° per mole = Energy released / Moles of [tex]Mg_3N_2[/tex](s)
∆H° per mole = -3.4 kJ / 0.004955 mol = -686.27 kJ/mol
Since the balanced equation shows that only half a mole of [tex]Mg_3N_2[/tex](s) is involved, we multiply the ∆H° per mole by 2:
∆H° = 2 * ∆H° per mole
∆H° = 2 * (-686.27 kJ/mol) = -1372.54 kJ/mol
Therefore, the ∆H° for the reaction [tex]1/2 Mg_3N_2(s) + 3H_2O(l)[/tex]→[tex]1/2 Mg(OH)_2 (s) + NH_3(g)[/tex] is approximately -1372.54 kJ/mol.
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HELP MEE PLEASEEEEE
Answer to question #1.
Answer to question #2.
Answer:
1. A
2. B
Explanation:
What is the pH of a saturated solution of Zn(OH)2?Ksp=1.8x10⁻¹⁴
Zinc hydroxide, which is represented by the chemical formula Zn(OH)₂, is a basic hydroxide salt of zinc.
In a saturated solution of Zn(OH)₂, the concentration of the zinc ions and the hydroxide ions will be equal to the solubility product of Zn(OH)₂. As a result, we can calculate the pH of a saturated solution of Zn(OH)₂ by using the equation for the solubility product constant (Ksp).
The solubility product constant for Zn(OH)₂ is given as Ksp=1.8x10⁻¹⁴. This means that the product of the zinc ion concentration [Zn²⁺] and the hydroxide ion concentration [OH⁻] in a saturated solution of Zn(OH)₂ will be equal to 1.8x10⁻¹⁴.
Using this equation, we can calculate the concentration of hydroxide ions in a saturated solution of Zn(OH)₂. Since the concentration of zinc ions is equal to the concentration of hydroxide ions in a saturated solution of Zn(OH)₂, we can calculate the concentration of zinc ions as well.
[Zn²⁺][OH⁻] = 1.8x10⁻¹⁴∴ [Zn²⁺] = [OH⁻] = √(1.8x10⁻¹⁴) = 1.34x10⁻⁷ M. The pH of the solution can be determined by using the formula: pOH = -log[OH⁻] = -log(1.34x10⁻⁷) = 6.87pH = 14 - pOH = 7.13. Therefore, the pH of a saturated solution of Zn(OH)₂ is approximately 7.13.
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Both HC2O4− and HS−HS are amphoteric.
A. Enter an equation to show how HC2O4−can act as a base with HS−acting as an acid.
B. Enter an equation to show how HC2O4− can act as an acid with HS− acting as a base.
A. [tex]HC_{2} O^{-} _{4[/tex] (oxalate ion) acts as a base by accepting a proton from [tex]HS^{-}[/tex] (hydrosulfide ion) to form [tex]H_{2}C_{2} O_{4}[/tex] (oxalic acid).
B. [tex]HC_{2} O^{-} _{4[/tex] (oxalate ion) acts as an acid by donating a proton to [tex]HS^{-}[/tex](hydrosulfide ion) to form [tex]C_{2} O^{-} _{4[/tex] (oxalate ion).
A. At the point when [tex]HC_{2} O^{-} _{4[/tex] goes about as a base, it acknowledges a proton ([tex]H^{+}[/tex]) from [tex]HS^{-}[/tex], which goes about as a corrosive. The condition can be addressed as:
[tex]HC_{2} O^{-} _{4[/tex]+ [tex]HS^{-}[/tex] → [tex]H_{2}C_{2} O_{4}[/tex] +[tex]S^{-} _{2}[/tex]
In this response,[tex]HC_{2} O^{-} _{4[/tex] goes about as a base by tolerating a proton from the corrosive [tex]HS^{-}[/tex], shaping the impartial particle [tex]H_{2}C_{2} O_{4}[/tex] (oxalic corrosive) and the form base [tex]S^{-} _{2}[/tex].
B. At the point when [tex]HC_{2} O^{-} _{4[/tex] goes about as a corrosive, it gives a proton ([tex]H^{+}[/tex]) to [tex]HS^{-}[/tex], which goes about as a base. The condition can be addressed as:
[tex]HC_{2} O^{-} _{4[/tex] +[tex]HS^{-}[/tex] → [tex]HC_{2} O^{-} _{4[/tex]+ [tex]H_{2} S[/tex]
In this response, [tex]HC_{2} O^{-} _{4[/tex]goes about as a corrosive by giving a proton to the base [tex]HS^{-}[/tex], bringing about the development of the form base [tex]HC_{2} O^{-} _{4[/tex](oxalate particle) and the unbiased atom [tex]H_{2} S[/tex] (hydrogen sulfide).
In the two cases, [tex]HC_{2} O^{-} _{4[/tex] displays its amphoteric nature by having the option to go about as both a corrosive and a base, contingent upon the idea of the responding species.
[tex]HS^{-}[/tex], thus, exhibits its capacity to go about as a corrosive while responding with [tex]HC_{2} O^{-} _{4[/tex] as a base and as a base while responding with [tex]HC_{2} O^{-} _{4[/tex] as a corrosive.
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A gas made up of atoms escapes through a pinhole 2.65 times as fast as N2 gas. Write the chemical formula of the gas. (Note: You need to show complete solution map in your Exam 2 Honor Pledge to receive Full credit). a. Ne b. O2 c. He d. Ar
The chemical formula of the gas is Option c, Helium.
We need to take into account the molar masses and the root mean square (RMS) speeds of various gases in order to ascertain the chemical formula of the gas that escapes through the pinhole 2.65 times quicker than N₂ gas.
The following equation describes how a gas's molar mass and RMS speed are related:
RMS velocity = 1/√(molar mass)
The following ratio may be established since the provided gas leaves 2.65 times more quickly than N₂ gas:
RMS speed of the given gas / RMS speed of N₂ gas = 2.65
Now, let's compare the molar masses of the options provided:
a. Ne (Neon) has a molar mass of approximately 20 g/mol.
b. O₂ (Oxygen) has a molar mass of approximately 32 g/mol.
c. He (Helium) has a molar mass of approximately 4 g/mol.
d. Ar (Argon) has a molar mass of approximately 40 g/mol.
Since the ratio of RMS speeds is greater than 1, the molar mass of the given gas must be less than that of N₂ gas. Among the options, the only gas with a molar mass significantly lower than N₂ gas is Helium (He) with a molar mass of approximately 4 g/mol.
Therefore, the chemical formula of the gas is Option C, Helium.
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you are given 8.16 g of an unknown mixture of ethane gas and oxygen gas. you burn the unknown mixture in a sealed container and recover 1.48 g of water as well as carbon dioxide and ethane gas. (v) what was the mass of oxygen gas in the unknown mixture? (w) what was the mass of ethane gas in the unknown mixture? (x) what was the mass percent of oxygen gas in the unknown mixture?
The mass of oxygen gas in the unknown mixture is approximately 5.868 g. The mass of ethane gas in the unknown mixture is approximately 0.812 g. The mass percent of oxygen gas in the unknown mixture is approximately 71.83%.
To solve this problem, we need to determine the masses of oxygen gas and ethane gas in the unknown mixture, as well as the mass percent of oxygen gas.
Let's start by calculating the mass of water produced;
Mass of water = 1.48 g
Since water is composed of hydrogen and oxygen in a 2:1 ratio, the molar mass of water is:
Molar mass of water = 2(1.00784 g/mol) + 15.999 g/mol = 18.015 g/mol
Now we can calculate the number of moles of water produced;
Number of moles of water = Mass of water/Molar mass of water
= 1.48 g / 18.015 g/mol
≈ 0.082 mol
From balanced chemical equation for the combustion of ethane;
C₂H₆ + 7/2 O₂ → 2 CO₂ + 3 H₂O
We can see that 1 mole of ethane produces 3 moles of water. Therefore, the number of moles of ethane can be calculated as;
Number of moles of ethane = (Number of moles of water) / 3
≈ 0.082 mol / 3
≈ 0.027 mol
The molar mass of ethane (C₂H₆) is;
Molar mass of ethane = 2(12.011 g/mol) + 6(1.00784 g/mol)
= 30.0708 g/mol
Finally, we can calculate the mass of ethane;
Mass of ethane = Number of moles of ethane × Molar mass of ethane
≈ 0.027 mol × 30.0708 g/mol
≈ 0.812 g
Now, to determine the mass of oxygen gas, we subtract the mass of ethane and water from the total mass of the unknown mixture:
Mass of oxygen gas = Total mass of unknown mixture - Mass of ethane - Mass of water
= 8.16 g - 0.812 g - 1.48 g
≈ 5.868 g
Finally, we can calculate the mass percent of oxygen gas in the unknown mixture;
Mass percent of oxygen gas = (Mass of oxygen gas / Total mass of unknown mixture) × 100%
= (5.868 g / 8.16 g) × 100%
≈ 71.83%
Therefore;
The mass of oxygen gas in the unknown mixture is approximately 5.868 g.
The mass of ethane gas in the unknown mixture is approximately 0.812 g.
The mass percent of oxygen gas in the unknown mixture is approximately 71.83%.
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Raul needs to ensure that when users enter an order into the tblOrders, the shipping date is at least two days after the order date on the data entry. Which option should he use?
Answer:
Input Mask
Explanation:
In this scenario, the best tool for Raul to use would be an Input Mask. When dealing with Microsoft Access or any other database tool, Input Masks are a great way of validating data inputs so that they always match the desired format. In this case, Raul would need to use input mask and apply the desired format while comparing it to the order date, therefore, making sure that it is always a minimum of 2 days after before it is accepted as a valid entry in the database.
If a reaction begins by adding 0.10 mol of A and 0.10 mol of B in a 1.0 L vessel, which of the following is true at equilibrium? Keq = 100
A + 2B ⇌ 2C
[A] > [B]
[B] = [C]
[B] > [C]
[A] = [B]
[A] < [B]
The correct option is (C) [B] > [C].
A + 2B ⇌ 2CThe equilibrium constant, Keq = 100Mole of A, nA = 0.1 molMole of B, nB = 0.1 molInitial concentration of A, [A] = 0.1/1.0 = 0.1 MInitial concentration of B, [B] = 0.1/1.0 = 0.1 MAt equilibrium, the reaction quotient (Qc) is given as,Qc = [C]²/([A][B]²)As Keq > Qc, the forward reaction is favored and the concentration of reactants decreases while the concentration of products increases. Now, let us determine the concentration of products C when the reaction reaches equilibrium.As the mole ratio of A:B:C is 1:2:2, the number of moles of C formed = 2nB = 2(0.1) = 0.2molConcentration of C at equilibrium, [C] = 0.2/1.0 = 0.2 MNow, let us compare the concentration of each reactant and product at equilibrium:[A] > [B][A] = [B][A] < [B][B] > [C][B] = [C]Hence, the correct option is (C) [B] > [C].
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H2SO4 + 2NaOH → Na2SO4 + 2H2O what volume of water vapor will be produced if you start with 71.5 g of sulfuric acid and excess of sodium hydroxide
Answer:
Explanation:
Find the molar mass of H2SO4
2H = 2 * 1 = 2
S = 1 * 32 =32
O4 = 4*16 = 64
total 98
Find the number of mols in 71.5 grams
mols = given mass / molar mass.
given mass = 71.5
molar mass = 98
mols = 71.5/98
mols = 0.7296 mols of H2SO4
Find the moles of H2O
From the Balanced equation, every mol of H2SO4 produces 2 moles of H2O
mols water = 2 * 0.7296
mols water = 1.4592
That's as far as I can take you. I have to know a great deal more to get the volume of H2O
Blank is the area of physical science that studies energy and how it acts with matter
Answer:
Physics is a natural science that involves the study of matter and its motion through space and time, along with related concepts such as energy and force. More broadly, it is the study of nature in an attempt to understand how the universe behaves.
Explanation:
will give brainliest
how does the angle of the sun affect the climate?
please write in your own words
Answer:
Depending on the different angles the sun reaches the earth at, the amount of the suns ray may differ per angle. Smaller, more concentrated areas of the suns rays would result in warmer temperatures while areas where sunlight is spread out may have colder temperatures.
write the equilibrium constant expression for the following chemical equation. co(g) 2h2(g) ⇌ ch3oh(g)
The equilibrium constant expression for the reaction CO(g) + 2H₂(g) ⇌ CH₃OH(g) is K = [CH₃OH] / [CO][H₂]^{2}.
The equilibrium constant is a measure of the relative concentrations of the reactants and products at equilibrium. A large value of K indicates that the reaction is product-favored, while a small value of K indicates that the reaction is reactant-favored.
The equilibrium constant is calculated by taking the product of the equilibrium concentrations of the products and dividing it by the product of the equilibrium concentrations of the reactants.
The equilibrium concentrations are the concentrations of the reactants and products at equilibrium, which is the point at which the forward and reverse reactions are occurring at the same rate.
The equilibrium constant is a useful tool for predicting the direction of a chemical reaction. A large value of K indicates that the reaction is product-favored, meaning that the products will be more abundant at equilibrium than the reactants.
A small value of K indicates that the reaction is reactant-favored, meaning that the reactants will be more abundant at equilibrium than the products.
The equilibrium constant is also a useful tool for predicting the effect of changes in temperature and pressure on a chemical reaction. An increase in temperature will generally shift the equilibrium to the side of the reaction that produces more moles of gas.
A decrease in pressure will generally shift the equilibrium to the side of the reaction that has fewer moles of gas. The equilibrium constant is a valuable tool for understanding and predicting the behavior of chemical reactions.
By understanding the equilibrium constant, chemists can predict the direction of a reaction, the effect of changes in temperature and pressure, and the relative concentrations of the reactants and products at equilibrium.
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Energy pyramid worksheet
Answer:
From top to bottom coyote, crow, squirrel, then acorn
Explanation:
The coyote has the least amount of energy and its the biggest predator so it belongs at the top. The crows eat squirrels and the squirrels eat acorns.
What volume of o2 is produced when 28.5 g of hydrogen peroxide decomposes to form water and oxygen at 150 degrees c and 2.0 atm?
Taking into account the reaction stoichiometry, the volume of O₂ is 7.28406 L when 28.5 g of hydrogen peroxide decomposes to form water and oxygen at 150 degrees c and 2.0 atm.
Reaction stoichiometryThe balanced reaction is:
2 H₂O₂ → 2 H₂O + O₂
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
H₂O₂: 2 molesH₂O: 2 molesO₂: 1 moleThe molar mass of the compounds is:
H₂O₂: 34 g/moleH₂O: 18 g/moleO₂: 32 g/moleBy reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
H₂O₂: 2 mole× 34 g/mole= 68 gramsH₂O: 2 moles× 18 g/mole= 36 gramsO₂: 1 mole× 32 g/mole= 32 gramsMass of O₂ formedThe following rule of three can be applied: if by reaction stoichiometry 68 grams of H₂O₂ form 1 mole of O₂, 28.5 grams of H₂O₂ form how many moles of O₂?
moles of O₂= (28.5 grams of H₂O₂×1 mole of O₂)÷68 grams of H₂O₂
moles of O₂= 0.42 grams
Then, 0.42 moles of O₂ are formed.
Definition of ideal gas lawIdeal gases are a simplification of real gases that is done to study them more easily. It is considered to be formed by point particles, do not interact with each other and move randomly. It is also considered that the molecules of an ideal gas, in themselves, do not occupy any volume.
The pressure, P, the temperature, T, and the volume, V, of an ideal gas, are related by a simple formula called the ideal gas law:
P×V = n×R×T
Where:
P is the gas pressure.V is the volume that occupies.T is its temperature.R is the ideal gas constant. The universal constant of ideal gases R has the same value for all gaseous substances. n is the number of moles of the gas. Volume of O₂In this case, you know:
P= 2 atmV = ?n= 0.42 molesR= 0.082 (atmL)÷(molK)T= 150 C= 423 KReplacing in the definition of the ideal gas law:
2 atm×V = 0.42 moles×0.082 (atmL)÷(molK)× 423 K
Solving:
V = (0.42 moles×0.082 (atmL)÷(molK)× 423 K)÷ 2 atm
V= 7.28406 L
Finally, the volume of O₂ is 7.28406 L.
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Complete the chemical equation for cellular respiration.
Glucose + (oxygen, carbon dioxide, water)
→ (glucose, oxygen, carbon dioxide)
+ water + (oxygen, energy, sugar)
The complete chemical equation for cellular respiration is:
C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + Energy
In this equation, glucose (C₆H₁₂O₆) is combined with oxygen (O₂) to produce carbon dioxide (CO₂) and water (H₂O). The process of cellular respiration occurs in the mitochondria of cells and involves the breakdown of glucose to release energy in the form of ATP (adenosine triphosphate).
During cellular respiration, glucose is oxidized to form carbon dioxide, and oxygen is reduced to form water. This process releases energy that is stored in ATP molecules and is used by cells to carry out various metabolic activities.
Overall, cellular respiration is a vital process in organisms to generate energy for cellular functions and is essential for the survival and functioning of living organisms.
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