Answers
b: probably a 60%
c: like 30%
d: his class shouldnt be that difficult if the class average is a C because the kids are still able to manage a passing grade
Explanation:
1a) c since c is the biggest part of the pie chart
1b) 25% as it is close to a quarter
quarter=25%
1c) A=10%
1d) I think Mr.M's class was difficult since 35% of people got decent grades (a and b). As that is a percentage less than half of the class i would consider that as a difficult class.
Hope this helped.
Related Questions
Helpppp
Present Your Findings
When you are finished with the experiment, complete the following data analysis and record your answers in the Essay box below.
Determine the volume of the box and the block.
Determine the ratio of the block to the box:
Multiply this number by 100 to turn it into a percent.
Complete this statement: The volume of the block is _____ percent of the volume of the box.
Determine the ratio of the number of hits to the number of shots:
Multiply this number by 100 to turn it into a percent.
Complete this statement: The block was hit _____ percent of the time.
Compare the results of step 2 to the results of step 3. Are the percentages similar?
Write a conclusion discussing the following items:
Based on your findings, do you think Rutherford's hypothesis was reasonable?
Restate Rutherford's hypothesis and describe how you tested it.
State whether your results support the hypothesis. If they do not, can you suggest some error in experimental procedure (other than general human error) that might explain it?
Finally, explain how this experiment confirms the nuclear model of the atom and the idea that most of the atom is empty space.
Answers
An hypothetical scenario is going to be used for this experiment.
Hypothetical Scenario:
The experiment aimed to test the effectiveness of different types of basketballs on shooting accuracy. Three test groups were created: one group was given a standard rubber basketball, another group was given a leather basketball, and the third group was given a synthetic basketball. Ten shots were taken with each ball and the number of hits were recorded.
Data Analysis:
The volume of the box was 50 cubic feet and the volume of the block was 5 cubic feet.The ratio of the block to the box was 1:10.The volume of the block is 10% of the volume of the box.The ratio of the number of hits to the number of shots was as follows: rubber ball - 7/10, leather ball - 8/10, synthetic ball - 6/10.The rubber ball was hit 70% of the time, the leather ball was hit 80% of the time, and the synthetic ball was hit 60% of the time.The percentage of the block to the box and the percentage of hits for each ball were not related.What is the conclusion?Conclusion:
Based on the findings, Rutherford's hypothesis was reasonable.
Rutherford's hypothesis was that atoms have a small, dense, positively charged nucleus and the rest of the atom is empty space where negatively charged electrons orbit. This hypothesis was tested by firing alpha particles at a thin gold foil and observing the deflection of the particles. The results of the experiment showed that most alpha particles passed through the gold foil, but a small percentage were deflected at large angles, suggesting the presence of a small, positively charged nucleus in the atom.Therefore, the results of the basketball experiment do not relate to Rutherford's hypothesis.
The experiment confirms the nuclear model of the atom and the idea that most of the atom is empty space because the majority of the alpha particles passed through the gold foil without any deflection, which implies that the atom is mostly empty space. The deflection of some particles suggested the presence of a small, positively charged nucleus, which supports the nuclear model of the atom.Learn more about volume on:
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What volume of oxygen can be produced from the decomposition of 25 g of aluminum chloride at 28°C in 750 mmHg
Answers
Answer:
Therefore, approximately 8.5 mL of chlorine gas can be produced from the decomposition of 25 g of aluminum chloride at 28°C and 750 mmHg.
Explanation:
The decomposition of aluminum chloride will not produce oxygen. Instead, it produces aluminum oxide and chlorine gas. The balanced chemical equation for this reaction is:
2AlCl3(s) → Al2O3(s) + 3Cl2(g)
To determine the volume of chlorine gas produced from the decomposition of 25 g of aluminum chloride, we need to use the ideal gas law, which is PV = nRT, where P is the pressure of the gas in atmospheres, V is the volume of the gas in liters, n is the number of moles of gas, R is the ideal gas constant (0.0821 L·atm/mol·K), and T is the temperature of the gas in Kelvin.
First, we need to determine the number of moles of aluminum chloride. The molar mass of AlCl3 is 133.34 g/mol, so:
25 g AlCl3 × (1 mol AlCl3/133.34 g AlCl3) = 0.187 moles AlCl3
According to the balanced chemical equation, 2 moles of AlCl3 will produce 3 moles of Cl2 gas. Therefore, 0.187 moles of AlCl3 will produce:
0.187 moles AlCl3 × (3 moles Cl2/2 moles AlCl3) = 0.2805 moles Cl2
Now we can use the ideal gas law to calculate the volume of Cl2 gas produced. We need to convert the temperature from Celsius to Kelvin by adding 273.15.
PV = nRT
V = nRT/P
V = (0.2805 mol) × (0.0821 L·atm/mol·K) × (301.15 K) / (750 mmHg × 1 atm/760 mmHg)
V = 0.0085 L or 8.5 mL (rounded to two significant figures)
Therefore, approximately 8.5 mL of chlorine gas can be produced from the decomposition of 25 g of aluminum chloride at 28°C and 750 mmHg.
What term describes the application of water to farmland from
a source such as a lake or river?
Answers
The term that describes the application of water to farmland from a source such as a lake or river is "irrigation."
What is Irrigation?
Irrigation is the process of artificially supplying water to crops or plants to promote their growth and development. It involves the application of water to agricultural land using various techniques, such as sprinklers, drip systems, or flood irrigation. The primary purpose of irrigation is to supplement the natural rainfall that is insufficient or irregular in certain regions, allowing farmers to grow crops in areas that would otherwise be unsuitable for farming. Irrigation systems can be designed to deliver the required amount of water directly to the roots of plants, which can increase crop yields and improve the quality of the produce. However, overuse or mismanagement of irrigation can lead to waterlogging, soil salinization, and other environmental problems.
Irrigation is the artificial application of water to land for the purpose of agricultural production. It is a critical practice in areas where rainfall is insufficient or unreliable, as it provides a reliable source of water for crops to grow. Irrigation systems can vary widely depending on the type of crops being grown, the availability of water, and the topography of the land.
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i need help answering these questions
Answers
The properties of gas are that they are easy to compress and they will expend to fill their container as well as they occupy more space then the liquids and solids they originated from.
What is gas?An imaginary gas which perfectly obeys gas laws is called as an ideal gas. It is a hypothetical gas whose molecules do not occupy any space and have no interactions among themselves.
This is the formula:
P . V = n . R. T
where P respresents the pressure of the gas, the V the volume where the gas is contained and T refers to the absolute T (T° in K)
R is the Universal Gases constant → 8.31 J/K.mol or 0.082 L.atm/mol.
Therefore, The properties of gas are that they are easy to compress and they will expend to fill their container as well as they occupy more space then the liquids and solids they originated from.
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Express the rate of reaction in terms of the change in concentration of each of the reactants and products: 2D(g) + 3E(g) + F(g) → 2G(g) + H(g) Rate = − 2 Δ[D] Δt = − 3 Δ[E] Δt = − Δ[F] Δt = 2 Δ[G] Δt = Δ[H] Δt Rate = 1 2 Δ[D] Δt = 1 3 Δ[E] Δt = 2 3 Δ[F] Δt = − 1 2 Δ[G] Δt = − Δ[H] Δt Rate = − 1 2 Δ[D] Δt = − 1 3 Δ[E] Δt = − Δ[F] Δt = 1 2 Δ[G] Δt = Δ[H] Δt When [D] is decreasing at 0. 74 mol/L·s, how fast is [H] increasing?
Answers
The rate of the reaction is correlated with the variation in concentration of each reactant and product, as can be seen from the rate expressions provided.
Express the rate of reaction in terms of the change in concentration of each of the reactants and products:Rate = 1/2 [D] / [H] / [T]
This demonstrates that the reaction's rate and [H] concentration change are directly inversely related. Given that [D] is vanishing at a rate of 0.74 mol/L/s, the following conclusions can be drawn:
[D]/[t] = -0.74 mol/Ls We can solve for [H] / t by substituting this value into the rate expression above: Rate = 1/2 [D] / [H] / [T], ([H] / t) = -1/2 (-0.74 mol/Ls), [H]/[t] = 2(0.74 mol/L s) = 1.48 mol/L s With [D] decreasing at a rate of 0.74 mol/L, [H] is therefore increasing at a rate of 1.48 mol/L/s.
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The tails of animals can serve many important functions. They are mainly used in balance and locomotion. Many lizards have a fragile, detachable tail that will come off when they are attacked by predators, allowing them to escape.
Why is the presence of a brightly colored, detachable tail an advantage for some lizards?
Answers
Answer:
The presence of a brightly colored, detachable tail can be advantageous for some lizards because it serves as a distraction or decoy for predators. When a predator attacks, the lizard can quickly detach its tail, which wriggles and continues to move for a short period of time. This sudden movement can divert the predator's attention away from the lizard's body, allowing the lizard to escape.
The bright coloration of the tail can also help to draw the predator's attention towards it, instead of the lizard's body. Bright colors are often used in the animal kingdom as warning signals, indicating that an animal is toxic or dangerous. While the lizard may not necessarily be toxic or dangerous, the bright colors of its tail can create a similar effect, deterring predators from attacking in the first place.
Additionally, the detachable tail can serve as a form of self-defense, allowing the lizard to escape from a predator's grasp. By detaching its tail, the lizard can leave the predator with a distraction while it makes its escape. Over time, the lizard can regrow its tail, allowing it to continue to use this defense mechanism in the future.
Pls I need help urgently. Find the Lewis dot structure for water and ethanol and examine the structures and identify which part is partial negative and partial positive.
Answers
The Lewis dot structure of water and ethanol are attached in the images below with hydrogen being positive and oxygen negative in water and ethyl part positive and hydroxyl part negative in ethanol.
What are Lewis dot structures?Lewis dot structures are also called as electron dot structures and can be drawn if the molecular formula of a compound is known. It provides information regarding the nature of bond and the position of atoms .
They are also capable of exhibiting the lone pair if any present in a molecule or compound.Lewis defined a base to be an electron pair donor and an acid to be an electron pair acceptor.
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How much carbon dioxide is produced with 1000 grams of gasoline
Answers
Burning 1000 grams of gasoline results in about 2.3 kilograms (5.1 pounds) of carbon dioxide.
What is carbon dioxide?One carbon atom and two oxygen atoms make up the odorless, naturally occurring gas known as carbon dioxide (CO2). The atmosphere of Earth contains most of it, which makes up roughly 0.04 percent of the air there.
Moreover, the respiration of animals, the burning of fossil fuels, and the fermentation of carbohydrates in beer and wine all produce carbon dioxide as byproducts.
A crucial component of the carbon cycle that occurs naturally on Earth and influences climate is carbon dioxide. Animals breathe out carbon dioxide whereas plants absorb it during photosynthesis.
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If a volume of a gas is at 19 L and 45C with a pressure of 25 atm, what will the pressure be, in mmH, if the volume is changed to 23 L if the molar mass and temperature are held constant?
• 15693.998 mmHg
• 1203.5 mmHg
• 20.6 mmHg
• 168 mmHg
Answers
Considering the Boyle's law, the pressure will be 5693.998 mmHg if the volume is changed to 23 L if the molar mass and temperature are held constant.
Definition of Boyle's lawBoyle's law states that the pressure of a gas in a closed container is inversely proportional to the volume of the container, when the temperature is constant and is expressed mathematically as:
P×V= k
where
P is the pressure.V is the volume.k is a constant.Considering an initial state 1 and a final state 2, it is fulfilled:
P₁×V₁= P₂×V₂
Pressure in mmHgIn this case, you know:
P₁= 25 atm V₁= 19 LP₂= ?V₂= 23 LTemperature are held constant.Replacing in Boyle's law:
25 atm× 19 L= P₂× 23 L
Solving:
(25 atm× 19 L)÷ 23 L= P₂
20.65 atm= 15693.998 mmHg= P₂ (being 1 atm= 760 mmHg)
Finally, the pressure will be 5693.998 mmHg.
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How many moles are 5.42x10^26 atoms of calcium
Answers
900moles are 5.42x10²⁶ atoms of calcium.
What does the Avogadro number mean?
Avogadro's number, or the quantity of units contained in one mole of any material, is 6.02214076* 10²³. Depending on the material and the reaction's characteristics, the units could be electrons, atoms, ions, or molecules (if any).
It indicates the quantity of atoms or molecules in a substance or an element per gram of the respective unit. The number is 6.022*10
²³, which is obtained by dividing the atomic mass of an element by the actual mass of its atom.
There are 6.02*10²³ atoms in one mole
So, 5.42x10²⁶ atoms of calcium will be [tex]5.42x10^{26}/6.02*10 ^{23[/tex] moles i.e.
900moles.
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if 45.8 L of hydrogen gas is produced in this reaction at STP, how many moles of sulfuric acid were reacted
Answers
One H2SO4 molecule has a 98 Atomic Weight Unit atomic mass. H2SO4 has an atomic mass of 98 grams per mole. One mole of H2SO4 is therefore present in 98 grams of H2SO4.
In chemistry, how is H2SO4 referred to?A powerful mineral acid with chemical formula H2SO4, sulfuric acid is extremely corrosive. It is a viscous liquid with a pungent-ethereal aroma that is soluble in water throughout all concentrations and ranges in color from colorless to slightly yellow.
Is H2SO4 an effective basic or acid?An extremely potent acid is sulfuric acid (H2SO4). An indication of a powerful acid is that sulfuric acid totally dissociates in water. Also, when a strong base reacts with a strong acid, the result is neutral salt and water. A neutral salt called Na2SO4 is created when the strong base NaOH and sulfuric acid are combined.
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What mass, in kg, of lithium hydroxide can be produced from 9.41 moles of lithium nitride? 1kg = 1000g
1Li3N + 3H2O = 3LiOH + 1NH3
Answers
Answer:
0.67752kg
Explanation:
Mole ratio of LiOH to Li3N
=n(LiOH)/n(Li3N
=3/4
as for what your writing it will be one of the biggest enviromental problems in 2023. pls help ASAP
Answers
I'm writing to you about an important land use conservation issue that has been gaining attention recently: preserving and protecting public lands.
What is issue?Issue is a term used to describe an unresolved problem or conflict. It can apply to any area of life, from personal relationships to global politics. An issue can be caused by many different factors, and can be addressed through a variety of methods. In some cases, an issue may be resolved through compromise or negotiation. In other cases, a resolution may require more formal methods, such as a court ruling or a change in a law.
As population growth and development continue to put a strain on our limited public land resources, it is essential that we work to conserve and protect these areas for future generations.
Public lands are used for a variety of important reasons, including recreation, wildlife habitat, timber production, and extractive resource extraction. Unfortunately, these areas are often threatened by development, recreational use, and resource extraction. To alleviate this issue, we need to take steps to protect these lands from further destruction by creating and enforcing regulations that prevent development and resource extraction. Additionally, we need to ensure that these areas are properly managed and maintained so that they can continue to provide a variety of benefits to the public.
There are a variety of ways that individuals can get involved in helping to protect public lands. One way is to join or support local organizations that are actively working to protect these areas. Additionally, individuals can write letters to their representatives to let them know their opinions on land use issues. Finally, individuals can volunteer their time to help with conservation or management efforts at public lands.
I hope you will join me in taking action to protect our public lands. Together, we can ensure that these areas remain available for future generations to enjoy.
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The density of oxygen at 1 atm and various temperatures is given in the table. Plot the data and circle the temperature(s) at which oxygen changes from liquid to gas.
Answers
Note that the point at which oxygen changes from liquid to gas is 90k. See the attached graph.
What is the rationale for the above response?
To plot the data, we can use a line graph with temperature (T) on the x-axis and density (d) on the y-axis. Here is a plot of the data:
From the plot, we can see that the density of oxygen decreases as the temperature increases. At around 90 K, there is a significant drop in density, indicating a change in state from liquid to gas. We can circle this temperature as the point at which oxygen changes from liquid to gas.
Therefore, we can circle the temperature 90 K as the point at which oxygen changes from liquid to gas.
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Which hydrocarbon is a member of the alkene series?
A) C2H
B) C3H6
C) C4H10
D) C5H12
Answers
what is the mole ratio for CuCl2 to Cu
Answers
Therefore, the mole ratio of CuCl₂ to Cu is 1:1.
What is moles?In chemistry, a mole is a unit used to measure the amount of a substance. One mole of a substance is equal to the number of atoms, molecules, or particles in that substance equal to the Avogadro's number. The mass of one mole of a substance in grams is numerically equal to its atomic or molecular mass in atomic mass units (amu). The concept of moles is important in chemical calculations involving reactions and stoichiometry.
Here,
The mole ratio for CuCl₂ to Cu can be determined from the balanced chemical equation for the reaction between CuCl₂ and Cu:
CuCl₂ + Cu → Cu₂Cl₂
From the balanced equation, it can be seen that 1 mole of CuCl₂ reacts with 1 mole of Cu to produce 1 mole of Cu₂Cl₂.
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Name the elements that are found in this chemical equation
Ba₃N₂+6H₂O→3Ba(OH)₂+2NH₃
Answers
Barium, nitrogen, hydrogen, and oxygen are the four elements found in the chemical equation given in the question.
An element is a pure substance that cannot be transformed into simpler compounds through any physical or chemical process. The atoms that make up an element are all of the same kind. There are three categories for elements: metals, nonmetals, and metalloids. The symbols used to symbolize different elements in the given equation is Ba (barium), N (Nitrogen), O (oxygen), and H (hydrogen). The reaction is:
Ba₃N₂ + 6H₂O → 3Ba(OH)₂ + 2NH₃
Chemical reaction is the transformation of one or more chemical reactants into one or more distinct products. Chemical elements or chemical compounds make up substances. In a chemical reaction, the atoms that make up the reactants are rearranged to produce various products.
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What is the value of ΔG for a solution of nitrous acid in which pH=1.30, [NO₂⁻]= 6.0×10⁻⁴ M and [HNO₂]=0.25 M?
Hint: non-standard conditions!
Answers
Answer:
28,359.1 J/mol
Explanation:
ΔG = ΔG° + RTln(Q)
the given conditions are non-standard, so calculate the values of Q and ΔG°.
the reaction for the dissociation of nitrous acid is:
HNO₂ ⇌ H⁺ + NO₂⁻
the equilibrium constant expression for the reaction is:
K = [H⁺][NO₂⁻]/[HNO₂]
At pH = 1.30, [H⁺] = 10^(-pH) = 5.01×10^(-2) M
substitute the given values into the expression:
K = (5.01×10^(-2))(6.0×10^(-4))/(0.25) = 1.203×10^(-5)
To calculate ΔG°, use the relationship between ΔG° and K:
ΔG° = -RTln(K)
Substitutethe values of R, T, and K:
ΔG° = -(8.314 J/mol·K)(298 K)ln(1.203×10^(-5)) = 27,615.7 J/mol
use the equation for ΔG:
ΔG = ΔG° + RTln(Q)
Substitute the values of ΔG°, R, T, and Q:
ΔG = 27,615.7 J/mol + (8.314 J/mol·K)(298 K)ln((5.01×10^(-2))(6.0×10^(-4))/(0.25)) = 28,359.1 J/mol
Therefore, the value of ΔG for this solution of nitrous acid is 28,359.1 J/mol.
Ocean trench example ?
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How many elements are present in the chemical formula CH,₂,0? +
Answers
The chemical formula CH₂O contains 3 elements: carbon, hydrogen, and oxygen.
How many elements are present in the chemical formula CH,₂,0?The chemical formula CH₂O represents formaldehyde, which is a simple organic compound.
To determine the number of elements in this formula, we count the different types of atoms that are present. In this case, there are three different types of atoms: carbon (C), hydrogen (H), and oxygen (O).
Therefore, the chemical formula CH₂O contains 3 elements: carbon, hydrogen, and oxygen.
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3.7522 mol of F2 is held at 7.25 atm and 770.56 K. What is the volume of its container in liters? Input your answer to the nearest whole number.
Answers
By using the ideal gas law to solve this problem and we get the volume of the container is approximately 1383 liters.
What is ideal gas law?
The ideal gas law is a fundamental equation in the study of thermodynamics and describes the behavior of an ideal gas. The ideal gas law relates the pressure (P), volume (V), number of moles (n), and temperature (T) of a gas:
PV = nRT
The ideal gas law assumes that the gas particles have negligible volume and do not interact with each other, except through elastic collisions. While real gases deviate from this ideal behavior at high pressures and low temperatures, the ideal gas law is still a useful approximation for many practical applications.
We can use the ideal gas law to solve this problem:
PV = nRT
where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature.
First, we need to convert the temperature to Kelvin:
770.56 K = 497.41 °C + 273.15
T = 1043.56 K
Next, we can plug in the values and solve for V:
V = (nRT)/P
V = (3.7522 mol)(0.08206 L·atm/(mol·K))(1043.56 K)/(7.25 atm)
V ≈ 1383 L
Therefore, the volume of the container is approximately 1383 liters.
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The NH3 synthesis in Haber's process is an exothermic reaction it should be favoured at low temperature but optimum temperature is 400 degree Why?
Answers
For the below mentioned reason, Haber's method operates at the ideal temperature of 450C:
ReasonBy adjusting the temperature or pressure, Haber's process is a reversible process that can alter the ammonia production.With rising temperatures, there is a reduction in ammonia production. Only at temperatures between 450 and 500 degrees Celsius can an ammonia production be substantial.A lengthy process would be required to produce ammonia if the temperature was too low. In order to keep the rate of reaction high, 450°C is maintained.Due to the temperature, pressure, and hot iron catalyst being kept in good condition, ammonia production is excellent. Because nitrogen and hydrogen are recycled, the reactants are only very minimally wasted.N2 (g) + 3H2 (g) 450°C–500°C2NH3 (g).For more information on Haber's process kindly visit to
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Jill formed ionic compounds using the index cards. She combined sodium and zinc to form the compound Na,Zn. Is this a possible ionic compound? Why or why not?
Answers
No, as they both have positive charges and ionic compounds form due to the attraction of opposite charges.
In the case given, Na and Zn both have +1 charges. They cannot be compatible for forming an ionic compound. The metal ion and its charge should be written first, then the nonmetal ion and its charge. Decide how many of each ion are required for the positive and negative charges to balance each other out, as the complex as a whole need to be electrically neutral.
The crisscross approach is an alternative to writing a valid formula for an ionic chemical. With this technique, each ion charge's numerical value is crossed across to form the subscript of the other ion. Charges' indicators are removed.
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Amixture of0.5 mole of ethanoic acid and 1 mole of ethanol in Idm' was allowed to reach equilibrium at room temperature.
The equilibrium mixture was quickly titrated and 40 cm° of 2 mol dm sodium hydroxide was used in the titration.
(a) Why was the reaction titrated quickly?
(b) Using the titration results, calculate the number of
moles of
(t) ethanoic acid left in the equilibrium mixture. (ii) ethanoic acid reacted. (ili) ethanol reacted.
(iv) ethanol left in the equilibrium mixture.
(e) Caleulate the equilibrium constant for the reaction between ethanoic acid and ethanol at room temperature.
Answers
(a) The reaction was titrated quickly to prevent further reaction between the reactants and products.
(bi) Number of moles of ethanoic acid left in the equilibrium mixture = 0.42 mol
ii) Number of moles of ethanoic acid reacted is 0.08 mol
iii) the number of moles of ethanol reacted is also 0.08 mol.
iv) Number of moles of ethanol left in the equilibrium mixture = 0.92 mol
(e) The equilibrium constant for the reaction between ethanoic acid and ethanol at room temperature is 0.209 dm^3/mol.
Titration of Ethanoic Acid(a) The reaction was titrated quickly to prevent further reaction between the reactants and products. The equilibrium between ethanoic acid and ethanol is reversible, and the addition of sodium hydroxide (a strong base) can shift the equilibrium towards the formation of the products. By titrating quickly, the equilibrium is essentially "frozen" at the moment of titration, and the moles of each reactant and product present in the equilibrium mixture can be determined.
(b) The balanced equation for the reaction between ethanoic acid and ethanol is:
CH3COOH + C2H5OH ⇌ CH3COOC2H5 + H2O
(i) Number of moles of ethanoic acid left in the equilibrium mixture:
Number of moles of sodium hydroxide used = 40 cm^3 × 2 mol/dm^3 = 0.08 mol
Since the stoichiometric ratio between sodium hydroxide and ethanoic acid is 1:1, the number of moles of ethanoic acid reacted is also 0.08 mol.
Number of moles of ethanoic acid left in the equilibrium mixture = 0.5 mol - 0.08 mol = 0.42 mol
(ii) Number of moles of ethanoic acid reacted:
0.08 mol
(iii) Number of moles of ethanol reacted:
Since the stoichiometric ratio between ethanol and ethanoic acid is 1:1, the number of moles of ethanol reacted is also 0.08 mol.
(iv) Number of moles of ethanol left in the equilibrium mixture:
Number of moles of ethanol initially present = 1 mol
Number of moles of ethanol reacted = 0.08 mol
Number of moles of ethanol left in the equilibrium mixture = 1 mol - 0.08 mol = 0.92 mol
(e) The equilibrium constant (Kc) for the reaction can be calculated using the concentrations of the reactants and products at equilibrium. At equilibrium, the concentration of each component can be calculated as follows:
[ethanoic acid] = 0.42 mol / 1 dm^3 = 0.42 mol/dm^3
[ethanol] = 0.92 mol / 1 dm^3 = 0.92 mol/dm^3
[ethyl ethanoate] = 0.08 mol / 1 dm^3 = 0.08 mol/dm^3
Kc = ([ethyl ethanoate] x [H2O]) / ([ethanoic acid] x [ethanol])
= (0.08 mol/dm^3) / (0.42 mol/dm^3 x 0.92 mol/dm^3)
= 0.209 dm^3/mol
Therefore, the equilibrium constant for the reaction between ethanoic acid and ethanol at room temperature is 0.209 dm^3/mol.
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In which sealed container would the organisms be able to continuously cycle O2 and CO2 gases?
A.
A terrarium with a frog and a pool of water
B.
An aquarium with water plants and a snail
C.
A terrarium with mice and wood shavings
D.
An aquarium with fish and plastic plants
Answers
In an aquarium with water plants and a snail, organism would be able to continuously cycle O[tex]_2[/tex] and CO[tex]_2[/tex] gases. Therefore, the correct option is option B.
What is biological life cycle?A biological life cycles in biology is a sequence of changes throughout form that an organism goes through before returning to its initial condition (or simply life cycle whenever the biological background is obvious).
Although the idea is similar to those of life history, development, and ontogeny, it varies from them in that it places more emphasis on renewal. In an aquarium with water plants and a snail, organism would be able to continuously cycle O[tex]_2[/tex] and CO[tex]_2[/tex] gases.
Therefore, the correct option is option B.
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Which of the following best explains why ice help keep aquatic animal alive in the winters?
Responses
Because water temporarily freezes the fish and actually extends their life span.
Because frozen water is less dense than liquid water and therefore floats in liquid water.
Because water contains hydrogen and oxygen and those two elements are important elements for life.
Because the frozen water is more dense than liquid water and therefore floats in liquid water
Answers
Answer: Because frozen water is less dense than liquid water and therefore floats in liquid water.
What is the molarity of ZnCl2 that forms when 20.0 g of zinc completely reacts with CuCl2 according to the following reaction? Assume a final volume of 285 mL . Zn(s)+CuCl2(aq)→ZnCl2(aq)+Cu(s)
Answers
Its molarity of [tex]ZnCl_{2}[/tex] produced by the full reaction of 20.0 g of zinc with [tex]CuCl_{2}[/tex] is 1.364 M.
What in chemistry is molarity?The proportion of solute moles to solution length is known as molarity. By dividing the number of moles of HCl but by amount (L) of the fluid where it had been dissolved, we may get the acid solution's molarity.
Molarity of product Zinc Chloride which is formed when 25.0 g of Zinc completely reacts with copper(II) chloride:
[tex]ZN(s) + CuCl_{2} (aq)[/tex] → [tex]ZnCl _{2} (aq) + Cu(s)[/tex]
Firstly no of moles of Zn can be obtained from :
[tex]Moles of Zn = \frac{Mass of Zn }{ Molar mass of Zn}[/tex], molar mass of Zn = 65.38 g/mol
hence moles of Zn = 25.0 g / 65.38 g/mol = 0.382 mol.
Now some conversion are needed to be done like:
1 m L = 0.001 L
Volume of solution = 285 mL
Hence 285 mL = 285 × 0.001 L = 0.28 L
Finally Molarity of [tex]ZnCl_{2}[/tex] can be calculated by:
Molarity of [tex]ZnCl_{2}[/tex] = [tex]\frac{number of moles of solute }{volume of solution in litres}[/tex]
Molarity = [tex]\frac{0.382mol}{0.28L}[/tex]
= 1.364 M.
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A gas sample is collected in a 2.2-L tank when the temperature is 2°C. What is the kelvin temperature of the gas?
Answers
275K is the kelvin temperature of the gas
What does the word "temperature" mean?
Temperature is a unit used to convey hotness or coldness on any of a number of scales, including Fahrenheit and Celsius. According to temperature, heat energy will naturally move from a hotter (body with a higher temperature) to a colder (body with a lower temperature) (one at a lower temperature).
Although a Celsius temperature is never equal to a Kelvin temperature, a shift of one degree Celsius equals a change of one Kelvin. On the Kelvin scale, there are no negative temps. Subtract 273.15 from the Kelvin temperature to get the Fahrenheit equivalent.
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If 2.852 mol O2 is reacted with 5.088 mol CO2
2CO + O2 = 2CO2
a. how many moles of CO2 will be formed?
b. How many moles of the excess reactant remains?
Answers
According to the stoichiometry of the chemical equation, 5.704 moles of carbon dioxide are formed and 3.704 moles of the excess reactant remains.
What is stoichiometry?It 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.
1 mole of oxygen gives 2 moles carbon dioxide thus 2.852 moles of oxygen will give 2×2.852=5.704 moles and moles of excess reactant remaining=5.704-2=3.704 moles.
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How many milligrams of ca2+ are present in 10. 0 ml of blood if 20. 72 ml of 0. 000903 m kmno4 solution is needed for the titration
Answers
Answer: 87690.67
Explanation: I don't even know if that's correct but i tried and i got close to that answer the i looked it up to see if i did it correctly and it rounded it up to that sooooooooo.........yeah.