The concentration of NaOH in the resulting solution is 1.80 mol/L.To determine the concentration of NaOH in the resulting solution, we need to use the equation:
What is concentration ?
concentration (in units of mol/L) = moles of solute / volume of solution (in units of L)
First, we need to calculate the moles of NaOH added to the flask:
moles of NaOH = mass of NaOH / molar mass of NaOH
moles of NaOH = 36.0 g / 40.00 g/mol
moles of NaOH = 0.900 mol
Next, we need to determine the volume of the solution. We know that 36.0 g of NaOH were added to a 500.0 mL volumetric flask, but the final volume of the solution is not given. We can assume that the volume of the solution is 500.0 mL, since that is the volume of the flask. However, we also need to take into account the fact that the addition of NaOH may cause the volume of the solution to increase slightly due to the dissolution of the solute.
Assuming that the volume of the solution is 500.0 mL, we can convert this to units of liters:
volume of solution = 500.0 mL / 1000 mL/L
volume of solution = 0.500 L
Now we can use the equation above to calculate the concentration of NaOH in the resulting solution:
concentration = 0.900 mol / 0.500 L
concentration = 1.80 mol/L
Therefore, the concentration of NaOH in the resulting solution is 1.80 mol/L.
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Complete question is: If 36.0 g of NaOH (MM = 40.00 g/mol) are added to a 500.0 mL volumetric flask, and water is added to fill the flask, 1.80 mol/L concentration of NaOH in the resulting solution.
Consider the data table as well as the experimental design. Which of the four cans should have the greatest change in temperature after five minutes?
Answer: air
Explanation:would be the most likely candidate for the cans
For the first order question
N2O5(g)》2NO2(g)+1÷2O2(g)
t1÷2=22.5 h at 20°C and 1.5 h at 40°C
a) calculate the activation energy of this reaction
b) if the arrhenius constant A=2.05×10^13 s^-1 determine the value of k at 30°C
This reaction has an activation energy of about 81.6 kJ/mol.
At 30 °C, the value of k is roughly 1.10 × 10¹³ s⁻¹.
How to determine activation energy and constant?a) To calculate the activation energy, use the Arrhenius equation:
k = A × e^(-Ea/RT)
where k = rate constant, A = pre-exponential factor, Ea = activation energy, R = gas constant, and T = temperature in Kelvin.
Use the given half-lives to calculate the rate constants at each temperature:
k₁ = 0.693 / t₁/2 = 0.693 / 22.5 = 0.0308 h⁻¹ at 20°C
k₂ = 0.693 / t₁/2 = 0.693 / 1.5 = 0.462 h⁻¹ at 40°C
Converting the temperatures to Kelvin:
T1 = 20°C + 273.15 = 293.15 K
T2 = 40°C + 273.15 = 313.15 K
Now use the Arrhenius equation to calculate the activation energy:
ln(k1/k2) = (Ea/R) × (1/T₂ - 1/T₁)
ln(0.0308/0.462) = (Ea/8.314) × (1/313.15 - 1/293.15)
-3.31 = (Ea/8.314) × (0.003386)
Ea = -3.31 × 8.314 / 0.003386 = 81570 J/mol
Therefore, the activation energy for this reaction is approximately 81.6 kJ/mol.
b) Use the Arrhenius equation again, with the given activation energy, A, and the new temperature (30°C = 303.15 K) to solve for k:
ln(k) = ln(A) - (Ea/R) × (1/T)
ln(k) = ln(2.05×10¹³) - (81570 / 8.314) × (1/303.15)
ln(k) = 31.87
k = e^(31.87) = 1.10 × 10¹³ s⁻¹
Therefore, the value of k at 30°C is approximately 1.10 × 10¹³ s⁻¹.
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PLEASE HELP!!!!!!!!!!!!!!!!!! Oxygen is in the 16th period, and should therefore have a 2- charge. peroxide also has a charge of 2-. Are they supposed to have the same charge? If so in nomenclature, how do I choose which one to use?
Oxygen has oxidation state of -2 in most compounds, but it can have different oxidation states in some compounds. In peroxide (O₂²⁻), oxygen has an oxidation state of -1
What is meant by nomenclature?Nomenclature is the system of naming chemical compounds according to a set of rules.
In peroxide (O₂²⁻), oxygen has an oxidation state of -1. This is because the two oxygen atoms share the two electrons that make up the covalent bond equally, resulting in an oxidation state of -1 for each oxygen atom.
So, while oxygen in peroxide has a charge of 2-, it does not have a 2- charge in general.
As for nomenclature, when naming compounds containing oxygen, the oxidation state of the oxygen atom is usually indicated by using a suffix. For example, the suffix "-ite" indicates a lower oxidation state, while the suffix "-ate" indicates a higher oxidation state.
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How many atoms are in 41.3 grams of Ag?
Explanation:
41.3 × (6.022 × 10²³)
248.7 × 10²³
2.487 × 10²⁵
How to solve question 2A and 2B
2A. The mole of HCl used is 3.2 moles
2B. The moles of each product produced as:
3.2 moles of NaCl3.2 moles of CO₂3.2 moles of H₂OA. How do i determine the mole of HCl used?The mole of HCl used can be obtained as follow:
NaHCO₃ + HCl -> NaCl + CO₂ + H₂O
From the balanced equation above,
1 mole of NaHCO₃ reacted with 1 mole of HCl
Therefore,
3.2 moles of NaHCO₃ will also react to 3.2 moles of HCl
Thus, the number of mole of HCl used is 3.2 moles
2B. How do i determine the mole of each product?The mole of each product produced can be obtain as shown:
For NaCl
NaHCO₃ + HCl -> NaCl + CO₂ + H₂O
From the balanced equation above,
1 mole of NaHCO₃ reacted to produce 1 mole of NaCl
Therefore,
3.2 moles of NaHCO₃ will also react to produce 3.2 moles of NaCl
Thus, the mole of NaCl produced is 3.2 moles
For CO₂
NaHCO₃ + HCl -> NaCl + CO₂ + H₂O
From the balanced equation above,
1 mole of NaHCO₃ reacted to produce 1 mole of CO₂
Therefore,
3.2 moles of NaHCO₃ will also react to produce 3.2 moles of CO₂
Thus, the mole of CO₂ produced is 3.2 moles
For H₂O
NaHCO₃ + HCl -> NaCl + CO₂ + H₂O
From the balanced equation above,
1 mole of NaHCO₃ reacted to produce 1 mole of H₂O
Therefore,
3.2 moles of NaHCO₃ will also react to produce 3.2 moles of H₂O
Thus, the mole of H₂O produced is 3.2 moles
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What is the mass percentage of C in codeine, CisHziNO,? Provide an answer to two decimal places.
72.21%
16.03%
100%
41 9%
27.73%
Answer: the mass percentage of C in codeine is 72.21%.
Explanation: Molar mass of C = 12.011 g/mol
Molar mass of CisHziNO = 299.368 g/mol (whole of molar masses of all molecules within the compound)
Number of C molecules in codeine = 18
Mass of C in codeine = 12.011 g/mol x 18 = 216.198 g/mol
Mass rate of C in codeine = (216.198 g/mol ÷ 299.368 g/mol) x 100% = 72.21%
Write word equations for the following skeleton equations. 1. AI (s) + O2(g) AI2O3 (s)
The word equation for the given skeleton equation is: Solid aluminum + gaseous oxygen → Solid aluminum oxide.
What is meant by chemical equations?Chemical equations are a way of representing chemical reactions using chemical formulas and symbols. They provide a concise and standardized way of describing chemical reactions and are an important tool for chemists to communicate and understand chemical changes.
In any chemical equation, reactants are written on left side of an arrow, whereas the products are written on right side. The arrow indicates the direction of reaction, from the reactants to products.
Chemical equations use chemical formulas to represent the elements and compounds involved in a reaction.
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1Li3 + 3H2O -> 1NH3 + 3LiOH
Determine the mass of lithium hydroxide produced when 0.38g of lithium nitride reacts with an excess of water.
0.785 g of lithium hydroxide (LiOH) are produced when 0.38 g of lithium nitride (Li₃N) reacts with an excess of water.
we can see that 3 moles of lithium hydroxide (LiOH) are produced for every 1 mole of lithium nitride (Li₃N) that reacts.
To determine the mass of LiOH produced from 0.38 g of Li₃N, we need to first calculate the number of moles of Li₃N present:
molar mass of Li₃N = 3 x atomic mass of Li + 1 x atomic mass of N
= 3 x 6.94 g/mol + 1 x 14.01 g/mol
= 34.83 g/mol
moles of Li₃N = mass / molar mass
= 0.38 g / 34.83 g/mol
= 0.01093 mol
Since the balanced equation shows that 1 mole of Li₃N produces 3 moles of LiOH, we can calculate the number of moles of LiOH produced:
moles of LiOH = 3 x moles of Li₃N
= 3 x 0.01093 mol
= 0.03279 mol
Finally, we can use the molar mass of LiOH to convert from moles to grams:
molar mass of LiOH = atomic mass of Li + 1 x atomic mass of O + 1 x atomic mass of H
= 6.94 g/mol + 15.99 g/mol + 1.01 g/mol
= 23.94 g/mol
mass of LiOH produced = moles of LiOH x molar mass of LiOH
= 0.03279 mol x 23.94 g/mol
= 0.785 g
Therefore, approximately 0.785 g of lithium hydroxide (LiOH) are produced when 0.38 g of lithium nitride (Li₃N) reacts with an excess of water.
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Calculate the number of valence electrons in methylene chloride, CH₂Cl₂.
Answer:
20 valence electrons
Explanation:
The number of valence electrons in carbon (C), hydrogen (H), and chlorine (Cl) are 4, 1, and 7, respectively. The number of total valence electrons (TVE) in CH₂Cl₂ is calculated as follows-
TVE in CH₂Cl₂ = valence electrons in C + 2(valence electrons in H) + 2(valence electrons in Cl)
= 4 + 2(1) + 2(7)
= 20
The density of acetic anhydride (C4H6O3) is 1.08 g/mL. If 3.00 mL of acetic anhydride is used in the experiment, then how many moles of acetic anhydride was used?
0.0318 moles of acetic anhydride was used in the experiment.
To determine the number of moles of acetic anhydride (C4H6O3) used, we need to use the formula:
moles = mass / molar mass
First, we need to find the mass of 3.00 mL of acetic anhydride using its density:
mass = volume x density = 3.00 mL x 1.08 g/mL = 3.24 g
Next, we need to find the molar mass of acetic anhydride:
molar mass of C4H6O3 = 4(12.01 g/mol) + 6(1.01 g/mol) + 3(16.00 g/mol) = 102.08 g/mol
Now, we can use the formula to find the number of moles:
moles = mass / molar mass = 3.24 g / 102.08 g/mol = 0.0318 mol
Therefore, 0.0318 moles of acetic anhydride was used in the experiment.
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Which set contains only examples of analogous structures?
The set of structures that includes only analogous organs is the wings of a butterfly, housefly, and bat, option A is correct.
Analogous organs perform similar functions in different organisms, but have different anatomical structures and evolved independently. In this case, butterflies, houseflies, and bats have wings that allow them to fly, but their wings have different structures and evolved independently.
The hind legs of horses, grasshoppers, and bats are not analogous, as each organism has different functions. The hands of man, monkey, and kangaroo are not analogous, as they have similar structures and evolved from a common ancestor. The mandibles of cockroach, mosquito, and honey bee are not analogous, as they have different structures and perform different functions in each organism, option A is correct.
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The complete question is:
Which one of the following is a set of structures that includes only analogous organs?
A) Wings of butterfly, housefly, and bat.
B) Hind legs of horse, grasshopper, and bat.
C) Hands of man, monkey, and kangaroo.
D) Mandibles of cockroaches, mosquitoes, and honey bees.
In this unbalanced chemical reaction, how many grams of H2O will be produced, if 4.95g of Fe3O4 are reacted completely with hydrogen?
we can estimate that approximately 1.54 grams of water will be produced when 4.95 grams of Fe3O4 react completely with hydrogen.
The balanced chemical equation for the reaction between Fe₃O₄ and hydrogen is:
Fe₃O₄ + 4H₂ → 3Fe + 4H₂O
we can see that 4 moles of hydrogen react with 1 mole of Fe₃O₄ to produce 4 moles of water.
To find the number of moles of Fe₃O₄ in 4.95g, we need to divide the mass by the molar mass of Fe₃O₄ :
4.95 g Fe₃O₄ / (231.53 g/mol Fe₃O₄ ) = 0.0214 mol Fe₃O₄
According to the mole ratio in the balanced equation, 4 moles of hydrogen produce 4 moles of water. Therefore, we can calculate the number of moles of hydrogen required to react with 0.0214 mol Fe₃O₄ :
0.0214 mol Fe₃O₄ × (4 mol H2 / 1 mol Fe₃O₄ ) = 0.0855 mol H2
Finally, we can use the molar mass of water to calculate the mass of water produced:
0.0855 mol H₂O × (18.02 g/mol H2O) = 1.54 g H₂O
Therefore, we can estimate that approximately 1.54 grams of water will be produced when 4.95 grams of Fe₃O₄ react completely with hydrogen.
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What are the polar ice caps and how do you think they help the world؟
The polar ice caps are large areas of ice that cover the Earth's polar regions, specifically the North Pole (Arctic) and the South Pole (Antarctica). These ice caps consist mainly of ice sheets, glaciers, icebergs, and sea ice, which have significant impacts on the global climate, ecosystems, and sea levels. Here's how they help the world:
1. Climate regulation: The polar ice caps play a crucial role in maintaining the Earth's temperature by reflecting sunlight back into space. The bright, reflective surface of the ice (called albedo) helps to cool the planet and counteract the greenhouse effect. When the ice caps melt, the darker ocean or land underneath absorbs more sunlight, leading to higher temperatures and further ice melting – a process known as the ice-albedo feedback loop.
2. Ocean circulation: The polar ice caps influence global ocean circulation patterns. Cold, dense water sinks near the polar regions, driving the thermohaline circulation (also known as the global ocean conveyor belt). This circulation helps to distribute heat and nutrients around the world, impacting weather patterns and supporting marine ecosystems.
3. Sea level regulation: The ice caps store a vast amount of freshwater in the form of ice. If all the ice in Antarctica and Greenland were to melt, global sea levels would rise by around 65 meters (213 feet), with devastating consequences for coastal communities and ecosystems. By keeping this water locked in ice, the polar ice caps help to regulate sea levels and protect coastal areas from flooding.
4. Ecosystem support: The polar ice caps support unique and fragile ecosystems that are home to a wide variety of plants and animals. Some of these species, such as Arctic foxes, polar bears, and emperor penguins, are specifically adapted to life in the harsh polar environments. The ice caps are also critical to the survival of many marine species, including fish, seals, and whales, which rely on the ice for breeding grounds, shelter, and hunting.
5. Scientific research: The polar regions offer valuable opportunities for scientific research, particularly in the fields of climate science, glaciology, and paleoclimatology. Ice cores taken from the ice caps provide a historical record of Earth's climate, allowing scientists to understand past climate changes and make more informed predictions about the future.
In conclusion, the polar ice caps play a vital role in regulating Earth's climate, maintaining ocean circulation, controlling sea levels, supporting unique ecosystems, and providing valuable scientific data. However, the ice caps are under threat from global warming, which has led to increased melting and a decline in ice extent. It is essential to address climate change and its impacts on the polar regions to preserve these important natural features and the benefits they provide to the world.complete the following bca table for the following reaction. 4.0 moles of silver nitrate is combined with an unknown amount of calcium bromide to produce two products in a double replacement reaction. name and provide the number of moles for each product.
4 moles of AgBr is produced
2 moles of Calcium nitrate is produced
What is the stoichiometry?Stoichiometry is used in calculating the quantities of the reactants and products in a chemical reaction as well as identifying the limiting reactant are all part of this process.
The reaction equation is;
[tex]CaBr_{2} (aq) + 2 AgNO_{3} (aq) ---- > 2 AgBr (s) + Ca(NO_{3} )_{2} (aq)[/tex]
If 2 moles of [tex]AgNO_{3}[/tex] produces 2 moles of AgBr
4 moles of [tex]AgNO_{3}[/tex] will produce 4 * 2/2 = 4 moles of AgBr
If 2 moles of [tex]AgNO_{3}[/tex] produces 1 mole of Calcium nitrate
4 moles of [tex]AgNO_{3}[/tex] will produce 4 * 1/2
2 moles of Calcium nitrate
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What is a product?
A. A substance that is used during a chemical reaction
B. A substance that doesn't change during a chemical reaction
OC. A substance that turns into waste during a chemical reaction
OD. A substance that is produced during a chemical reaction
Answer:
D. something's that's produced during a chemical reaction
Answer:
Explanation:
The answer is Option D.
A substance that is produced during a chemical reaction.
for example in a chemical reaction A+B -----> C
here, reactants A and B react together to produce product C.
2 KCIO; (s) —> 2 KCI(s) + 3 0,(g)
How many moles of O, form if 3.0 mol of KCIO, are totally consumed?
Therefore, if 3.0 moles of Potassium chlorate are completely destroyed, 4.5 moles of oxygen will form.
How many water molecules make up 3.0 moles of water?Therefore, there will be 36=18 moles of water molecules in 3 moles of the material. Keep in mind that there are 6.02 x 1023 molecules in a mole of molecules. Thus, there will be 6.021023181.081025 water molecules in total here.
If 2 moles of Potassium chlorate decompose to form 3 moles of oxygen, then 1 mole of Potassium chlorate will decompose to form 3/2 moles of oxygen.
Therefore, to find out how many moles of oxygen will form from 3.0 moles of Potassium chlorate, we can use the following calculation:
moles of oxygen = moles of Potassium chlorate x (3/2)
[tex]moles of oxygen = 3.0 mol x (3/2)[/tex]
moles of oxygen = 4.5 mol.
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7. Starting with the following equation,
BaCk(ag) + Na;POA(ag) -> Bas (PO.)(s) + NaC|(aq)
calculate the mass in grams of BaCl2 (formula mass = 208.23 amu) that will be required to produce 41.5
grams of Ba (PO.)2 (formula mass = 601.92 amu)
The mass in grams of BaCl₂ (formula mass = 208.23 amu) that will be required to produce 41.5 grams of Ba (PO₄)₂ is 18.48 g. This is using the stoichiometric ratio.
What is stoichiometric ratio?The relationship between the quantities of reactants and products prior to, during, and after chemical reactions is known as stoichiometry.
Stoichiometry is based on the law of conservation of mass, which states that the sum of the masses of the reactants and products must equal one another. This realization led scientists to conclude that the ratio of positive integers is typically formed by the relationships between the quantities of the reactants and products. This means that the amount of the product may be determined if the amounts of the individual reactants are known. On the other hand, if the amount of one reactant is known and the amount of the products can be computed using empirical data, the amount of the other reactants can likewise be calculated.
Using the stoichiometric ratio of the equation and the molar masses of the reactants, we can calculate the mass of BaCl₂ required to produce 41.5 grams of Ba (PO₄)₂.
Molar mass of BaCl₂ = 208.23 g/mol
Molar mass of Ba (PO₄)₂ = 601.92 g/mol
According to the equation, the stoichiometric ratio between BaCl₂ and the product (Ba (PO₄)₂ is 1 : 3.
Therefore, we will need 1 mol of BaCl₂ to produce 3 moles of Ba (PO₄)₂
Therefore, the mass of BaCl2 required to produce 41.5 grams of Ba (PO₄)₂ is:
Mass of BaCl₂ = 41.5 g/601.92 g/mol x 208.23 g/mol
Mass of BaCl₂ = 18.48 g
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If 64.0% of a Ga67 sample remains in the patient 2.33 days after injection, what is the half‑life of Ga67?
The half‑life of Ga67 is 3.67 days.
The half-life of a chemical reaction can be defined as the time taken for the concentration of a given reactant to reach 50% of its initial concentration (i.e. the time taken for the reactant concentration to reach half of its initial value). It is usually expressed in seconds.
Half-lives are characteristic properties of the various unstable atomic nuclei and the particular way in which they decay.
Given,
Let the initial amount be 100, so final amount will be 100 - 64 = 36
time = 2.33 days
= 2.33 × 24 × 60 × 60
= 201312 seconds
k = ( 1÷ t) log ( initial ÷ final)
k = 0.189 s⁻¹
half life = 0.693 ÷ k
= 315286.62 seconds
= 3.67 days
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3. Consider this unbalanced equation: NH4NO3 → N₂O + H₂O
a. If we allow 4.122 moles of NH4NO3 to decompose, how much water will be
produced?
b. If we allow 4.122 moles of NH4NO3 to decompose, how much dinitrogen
monoxide will be produced?
When heated, ammonium nitrate decomposes explosively according to the balancing equation: 2 NH₄NO₃(s) + 2 N₂(g) + 4 H₂O(g) Calculate the total volume of gas generated by the full breakdown of 1.55 kg of ammonium nitrate (at 125 °C and 748 mmHg).
Does [tex]NH_{4} NO_{3}[/tex] produce [tex]NO_{2}[/tex] when heated?When ammonium nitrate is heated, it produces nitrous oxide and water molecules. When ammonium nitrate (NH₄NO₃) is heated, it produces nitrous oxide (N₂O) and water (H₂O).
Endothermic dissolution of ammonium nitrate in water occurs because more energy is consumed to separate the ions in the solid than is created when the ions establish new connections with water molecules.
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student recorded the dates in may on which they observed a full moon and last quarter moon. Om which dates will most likely be able to observe a new moon?
The first quarter is the point in the lunar cycle where the moon is one (1) week after the new moon has risen. At first quarter, the moon will also be in its "waning gibbous" phase.
A full moon and a new moon are two different things?The moon is called a "new moon" when it lies between the sun and the Earth, as opposed to a "full moon," which occurs when the moon is directly above. Furthermore, because we cannot even see the new moon from Earth, unlike full moons, it appears as though it doesn't exist at all.
A half (1/2) or 50% of the moon is lighted during the waning gibbous phase, which occurs once per new moon.
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Convert 3.20 bar to atm
A sodium ion Na+ with a charge of 1.6x10^-19 and a chloride ion Cl- with a charge of -1.6x10^-19 are separated by a distance of 4.95 Nm . How much work would be required to increase the separation of the two ions to an infinite distance?
Answer: , the work required to separate the two ions to an infinite distance is 4.63 x 10^-19 J.
Explanation: One can determine the potential energy of two point charges by utilizing the specified equation:
The value of U is directly proportional to the product of q1 and q2, and inversely proportional to the distance between them (r), where k is a constant factor.
The potential energy denoted by U is determined by the Coulomb constant, k, which has a value of 9 x 10^9 Nm^2/C^2. The calculation of U involves the charges of two particles, q1 and q2, as well as the distance between them, denoted by r.
We have an instance where a sodium ion (Na+) has a charge of 1.6x10^-19 C, and a chloride ion (Cl-) has a charge of -1.6x10^-19 C, positioned 4.95 Nm apart from each other.
Once we insert the given numbers, the result obtained is:
The expression for U can be obtained by utilizing the equation U = (kQq)/r, with k being the Coulomb's constant equal to 9 x 10^9 Nm^2/C^2, Q and q representing the electric charges of -1.6x10^-19 C and -1.6x10^-19 C, respectively, and r being the distance between the charges of 4.95 Nm.
The value of U is negative 4.63 times 10 to the power of negative 19 Joules.
It is important to observe that the negative symbol signifies the negativity of the potential energy, implying that effort must be exerted in order to disassociate the two ions.
Predict which of the following reactions has a positive change in entropy.
l. 2N2(g) + O2(g) → 2N2O(g)
II. CaCO3(s) → CaO(s) + CO2(g)
III. Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g)
Several factors can dictate entropy in an equation.
These include:
1. Phase changes
⇒ When a solid turns to a liquid, the entropy increases as the particles have more freedom to move around and thus have a greater ability for 'disorder'. Same goes for a liquid turning to a gas. In a gas, the intermolecular forces are much weaker than that of a solid or liquid, allowing the particles more freedom.
So, going from a solid to liquid to gas increases entropy, and going the other way, from gas to liquid to solid, decreases entropy.
Example:
H₂O(l) -> H₂O(g)
This will have a positive entropy change, as the water molecules are becoming gaseous and thus have more freedom.
2. Dissolution
⇒ Similarly, breaking up particles of a solute when dissolving in a solvent will increase entropy as the particles are no longer bound together.
So, dissolving a solute will increase entropy.
Example:
NaCl(s) -> NaCl(aq)
This will have a positive entropy change, as the NaCl particles are more free after being separated.
3. Number of products and reactants
⇒ Generally, if you have more moles of products than reactants, if they are the same phase then entropy will increase. Note this is not necessarily true if you form a gas from two non-gas reactants, as the gas will still have more entropy.
4. Temperature
⇒ Increasing temperature will increase entropy as the particles have more kinetic energy and are then moving faster.
-------------------------------------------
l. 2N2(g) + O2(g) → 2N2O(g)
3 moles of gas are forming 2 moles of gas. The phase of products and reactants are the same, so since we have less moles of product than reactant, entropy will be negative.
II. CaCO3(s) → CaO(s) + CO2(g)
1 mole of solid is forming 1 mole of solid and 1 mole of gas. There is a phase change from solid to gas, and there are more moles of product than reactant, entropy will be positive.
III. Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g)
While 3 moles of reactant are forming only 2 moles product, we are forming a gas from non-gaseous reactants, so entropy will be positive regardless.
What is the pH of a solution that has a hydronium concentration of 4.8 x 10-12
The pH of a solution that has a hydronium concentration of 4.8 x 10⁻¹² is 11.32.
What is pH?The term "potential of hydrogen" (sometimes known as "power of hydrogen") has historically been used to describe this property in chemistry. It is a scale used to describe how basic or how acidic an aqueous solution is. Lower pH values are recorded for acidic solutions (solutions with higher H+ ion concentrations) than for basic or alkaline solutions.The set of standard solutions whose pH has been defined by international agreement can be used to trace the pH scale.[4] Using a concentration cell with transference, the potential difference between a hydrogen electrode and a standard electrode, such as the silver chloride electrode, is measured to get the primary pH standard values. With the use of a glass electrode, a pH meter, or a color-changing indicator, the pH of aqueous solutions can be determined.
The pH of a solution is the negative log of its hydronium ion concentration. To calculate the pH of a solution, we can use the following equation:
pH = -log[H⁺]
Therefore, the pH of a solution with a hydronium ion concentration of 4.8 x 10⁻¹² is -log(4.8 x 10⁻¹²) = 11.32.
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Complete the w expression for the autoionization of water at 25 °C.
Answer:
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Explanation:
The equilibrium expression for this reaction is Kw = [H₃O⁺][OH⁻], where Kw is the autoionization constant for water. At 25°C, the value of Kw is 1.0 x 10⁻¹⁴.
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A toy balloon has an internal pressure of 1.05 atm and a volume of 5.0 L. If the temperature where the balloon is released is 250 C, what will happen to the volume when the balloon rises to an altitude where the pressure is 0.65 atm and the temperature is –150 C?
The combined gas law, which links a gas's pressure, volume, and temperature, can be used to solve this issue. When the balloon reaches an altitude with a pressure of 0.65 atm and a temperature of -150 C, its capacity will fall to 4.9 L.
What's the current temperature?The Centigrade scale, Celsius size, and Kelvin scale are the three scales that are most frequently used to measure temperature.Any item contains molecules that move or vibrate. Its temperature will rise when it is heated because the molecules are moving more quickly.A tool called a thermometer is used to measure it. the three units used to measure temperature.
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Use the periodic table to classify each of the elements below:
Calcium:
Vanadium:
Xenon:
Idoine:
Potassium:
Strontium:
Classify them out of the categories: alkali metal, alkaline earth metal, transitional metal, inner transition metal, halogen, noble gas.
Answer: Calcium: Alkaline earth metal
Vanadium: Transitional metal
Xenon: Noble gas
Iodine: Halogen
Potassium: Alkali metal
Strontium: Alkaline earth metal
Explanation:
What kind of inference can the reader make about the
importance of sugar in the late nineteenth century?
Sugar was central to people's daily lives, work, and
economy.
Sugar cane plantation owners needed cheap labor
after the enslaved were freed.
Sugar cane is a labor intensive crop to grow and
harvest.
Sugar was a necessity enjoyed by the poorest
shopgirls to the richest kings.
Sugar cane plantation owners needed cheap labor after the enslaved were freed.
What are sugar cane plantations?We know that in the nineteenth century the era of slave trade was actually coming to a close and the concern of many of the slave owners both in Europe and America was the future of their agricultural businesses.
The slave owners mostly used the slaves to do the work on the farm and in the absence of the slaves, the work could not be done. This is why the owners of the slaves sought for cheap labor after the slaves were freed.
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Sugar was important in the late nineteenth century for both dietary and economic reasons. It was consumed by all social classes and significantly influenced the labor practices in agriculture.
Explanation:Based on the information provided, one can infer that sugar was of significant importance in the late nineteenth century. It served as a staple in people's daily diets and was enjoyed by all social classes, from shopgirls to kings. In the economic sphere, sugar cane farming was a notable industry. Sugar canes were labor-intensive to grow and harvest, which required plantation owners to seek cheap labor. This implies that the sugar industry had a substantial influence on labor practices during this era. It is therefore clear that sugar was not only a dietary necessity but also a crucial factor in the broader economic and social structure of the community.
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Calculate the mass of the white solid calcium carbonate that forms with 25.0L of a 0.100 M calcium nitrate solution mixed with 20.0 mL of a 0.15M sodium carbonate solution.
Answer:
The mass of the white solid calcium carbonate that forms is 0.300 g.
Explanation:
To calculate the mass of the white solid calcium carbonate that forms, we first need to determine the limiting reagent in the reaction between calcium nitrate and sodium carbonate. The balanced chemical equation for the reaction is:
Ca(NO3)2(aq) + Na2CO3(aq) → CaCO3(s) + 2NaNO3(aq)
From the equation, we can see that one mole of calcium nitrate reacts with one mole of sodium carbonate to produce one mole of calcium carbonate. Therefore, the limiting reagent is the one that produces the least amount of calcium carbonate.
To determine the limiting reagent, we need to calculate the moles of calcium nitrate and sodium carbonate used in the reaction:
Moles of calcium nitrate = volume of solution (L) x concentration (mol/L) = 25.0 L x 0.100 mol/L = 2.50 mol
Moles of sodium carbonate = volume of solution (L) x concentration (mol/L) = 0.0200 L x 0.150 mol/L = 0.00300 mol
Since the moles of sodium carbonate are much smaller than the moles of calcium nitrate, sodium carbonate is the limiting reagent.
The balanced chemical equation tells us that one mole of calcium carbonate is produced for every mole of sodium carbonate used. Therefore, the moles of calcium carbonate produced are also equal to 0.00300 mol.
Finally, we can calculate the mass of calcium carbonate produced using the molar mass of calcium carbonate:
Mass = moles x molar mass = 0.00300 mol x 100.1 g/mol = 0.300 g
Therefore, the mass of the white solid calcium carbonate that forms is 0.300 g.