Answers
Answer:
Explanation:
The first law of Thermodynamics is known as Conservation because it explains that energy is always maintained within a closed system and cannot be created or destroyed. Therefore, this is observed when there is no longer change in temperature in a system. Mainly because the energy is not being transferred to and from another system. Without this transfer of energy, the energy itself gets conserved within the system and the temperature no longer fluctuates.
Related Questions
imagine the two atoms are in a bound state. if they are 0.1 nm apart and have no kinetic energy, what is the minimum amount of energy (in joules) that needs to be added to the system in order to break the bond?
Answers
The calculate the minimum amount of energy needed to break the bond between two atoms, we first need to know the bond energy. Bond energy is the energy required to break a specific chemical bond between atoms. Unfortunately, without knowing the specific atoms or bond energy involved, we cannot calculate the exact minimum amount of energy needed in Joules.
The general idea of the process involved. Atoms are the smallest units of matter that make up all the elements and compounds. Kinetic energy refers to the energy of an object in motion. When two atoms are in a bound state, they are held together by a chemical bond. In order to break the bond between two atoms that are 0.1 nm apart and have no kinetic energy Determine the bond energy E for the specific chemical bond between the atoms. This value is usually given in units of Joules per mole (J/mol). Convert the bond energy from Joules per mole to Joules per pair of atoms by dividing it by Avogadro's number 6.022 x 10^23. The resulting value will give you the minimum amount of energy that needs to be added to the system in order to break the bond between the two atoms. Keep in mind that this calculation requires knowledge of the specific atoms and bond energy.
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What is the hydroxide ion concentration in an aqueous solution with a hydrogen ion concentration of
concentration
2.70 x 10-2 M?
Answers
(2.70x10-2)[OH-] = 1x10-14
[OH-] = 1x10-14/2.70x10-2
[OH-] = 3.70x10-13 M (assuming you ignore the autoionization of H2O)
What is the concentration, in M, of a KBr solution that contains 0.0688 moles of
KBr dissolved in 0.250 liters?
2.75 M
3.63 M
1.78 M
0.275 M
Answers
Answer:
2.75M
Explanation:
Concentration(M)= mol/volume
0.0688mol/0.250L
=0.2752M
the freezing-point depression for a given aqueous solution is 0.34 k. the freezing-point depression constant for water is 1.86 k/m. calculate the molality of solutes in the solution.
Answers
the molality of solutes in the aqueous solution is 0.182 molal.
Freezing-point depression constant for water (\(K_f\)) = 1.86 K/mFreezing-point depression of aqueous solution (Δ\(T_f\)) = 0.34 KThe molality of solute in the solution = ?The formula to calculate molality is as follows;m = moles of solute/kilograms of solvent.
⇒m = (molality) = (Δ\(T_f\)) / (\(K_f\) × w2)
Here, Δ\(T_f\) = Freezing-point depression\(K_f\) = Freezing-point depression constant for waterw2 = Mass of solvent (Water) in KgWe have to calculate the molality of solutes in the solution by using the freezing-point depression constant and freezing-point depression of the aqueous solution.
Now, Substituting the given values, we get,
⇒ m = (Δ\(T_f\)) / (\(K_f\) × w2)
⇒ m = 0.34 / (1.86 × w2)
⇒ m = 0.182 molal
Therefore, the molality of solutes in the solution is 0.182 molal.
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The decomposing of a system into a collection of layers, where
the layers above one another (or similarly, below one another) are
in a particular order is called_________.
Answers
The decomposing of a system into a collection of layers, where the layers above one another (or similarly, below one another) are in a particular order is called stratification. A system is broken down or divided into distinct levels, each with its own special traits or attributes, through stratification.
This configuration happens when various aspects of a system settle or separate in accordance with their densities or other considerations. Numerous natural and man-made systems, including sedimentary rock formations, atmospheric layers, oceanic water columns, and even social structures, exhibit stratification.
Stratification can happen as a result of gravitational forces, temperature gradients, chemical reactions, or other variables that affect how the system's components are distributed and arranged. The resulting stratified layers frequently have various physical or chemical characteristics.
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What type of chemical reaction does this represent.
Answers
Answer:
combustion
Explanation:
your welcome :)
HELP THIS IS DUE BY 11:59 TONIGHT ITS CURRENTLY LIKE 11:40??
identify: one herbivore, one carnivore, one omnivore, and one decomposer.
Answers
herbivore: cow
carnivore: lion
omnivore: bear
decomposer: water mold
Answer:
rabbit, kingfisher,lizard, fungi
Explanation:
hrbivore is an organism which feeds on plants. carnivore is also an organism that feeds on other organism. omnivore is also an organism that feeds on other organisms. Decomposers arsle organisms that recycle nutrients.
difference between very short and Short period in modern periodic table
Answers
Answer:
There are three types of periods in the modern periodic table: very short periods, short periods, and long periods.
Very short period contains only two elements, Hydrogen and Helium. These elements have only one shell, and their electrons can only occupy the s-orbital.Short periods contain eight elements. The first two elements in a short period can only occupy the s-orbital, while the remaining six elements can also occupy the p-orbital.Long periods contain 18 elements. The first six elements in a long period can only occupy the s- and p-orbitals, while the remaining 12 elements can also occupy the d-orbital.The difference between very short periods and short periods is the number of elements they contain. Very short periods only contain two elements, while short periods contain eight elements. The difference between short periods and long periods is the number of orbitals that can be occupied by electrons in each period. Short periods can only have electrons in the s- and p-orbitals, while long periods can also have electrons in the d-orbital.
Here is a table summarizing the differences between very short periods, short periods, and long periods:
Period type: Very short periodNumber of elements: 2
Orbitals that can be occupied by electrons: s-orbital only.Period type: short period
Number of elements: 8
Orbitals that can be occupied by electron: s- and p-orbitals.Period type: long period
Number of element: 18
Orbitals that can be occupied by electrons: s-, p-, and d-orbitals
he long run equilibrium condition for perfect competition is:
a. P=AVC=MR=MC.
b. Q=AVC=MR=MC.
c. Q=ATC=MR=MC.
d. P=ATC=MR=MC.
Answers
Option (d), P=ATC=MR=MC, accurately represents the long-run equilibrium condition for perfect competition, reflecting the balance between price and cost for firms operating in a competitive market.
The long-run equilibrium condition for perfect competition is that price (P) is equal to average total cost (ATC), which is also equal to marginal cost (MC), and marginal revenue (MR).
Option (d), P=ATC=MR=MC, best represents the long-run equilibrium condition for perfect competition. In perfect competition, firms operate at the minimum point of their average total cost curve, where price equals both average total cost and marginal cost. This condition ensures that firms are earning zero economic profit and are producing at an efficient level.
In the long run, if firms are earning economic profit, new firms will enter the market, increasing competition and driving prices down. Conversely, if firms are experiencing losses, some firms may exit the market, reducing competition and causing prices to rise. This process continues until firms reach a state where price equals average total cost, marginal cost, and marginal revenue, ensuring a long-run equilibrium.
Therefore, option (d), P=ATC=MR=MC, accurately represents the long-run equilibrium condition for perfect competition, reflecting the balance between price and cost for firms operating in a competitive market.
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if anyone can sole I give big brain
___. CO(g) +. ___ H2(g) ---> ___ C8H18(l) +. ___ H2O
Answers
Answer:
. 8 CO(g) + 17 H2(g) 1 C8H18(l) + 8 H2O
Explanation:
at constant temperature and pressure, 5.0 l of so2 is combined with 3.0 l of o2 according to the equation: 2 so2(g) o2(g) --> 2 so3(g) after the so3 formation is complete, what is the volume of the mixture?.
Answers
The volume of the mixture is 5 L
What is limiting reagent ?The limiting reagent is the one that is completely consumed during a reaction. Reagents that are entirely consumed by a chemical reaction are known as limiting reagents. They are additionally known as limiting reactants or limiting agents.
Reactants in a chemical reaction are referred to as surplus reagents if they are still present at the end of the reaction. Because its quantity restricts the number of products that can be generated, the reagent that is totally consumed or reacted is known as the limiting reagent.
We should first use the mole ratio, and SO 2 as the limiting reagent .
That would yield 5.0 L or 2 moles of SO3, but that is not one of your options. Since the temperature and pressure are both constant, the volume is equal to the number of moles since n/v = p/rt.
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Which of the following combinations of gases were most likely the major components of the earth's early atmosphere? a. nitrogen, hydrogen, and methane b. hydrogen, helium, methane, and ammonia c. oxygen, hydrogen, and helium d. oxygen, nitrogen, hydrogen, and helium
Answers
The major components of the earth's early atmosphere were most likely nitrogen, hydrogen, and methane (Option A).
What were the major components of the early Earth's atmosphere?Scientists hypothesize that Earth's early atmosphere was primarily composed of hydrogen gas, nitrogen gas, methane gas, and water vapor. They suggest that small amounts of carbon dioxide, hydrogen sulfide, and ammonia were also present.
What is the present Earth's atmosphere composition?At present, Earth's atmosphere is composed of nitrogen gas (78%), oxygen gas (21%), and trace amounts of other gases, including argon, carbon dioxide, neon, helium, and methane.
Hence, the correct answer is Option A.
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Concentrated hydrofluoric acid (hf) solution is 49. 0% by mass and has a density of 1. 179g/ml. What are its molarity and molality?
Answers
Concentrated hydrofluoric acid (hf) solution is 49. 0% by mass and has a density of 1. 179g/ml. Molality is 2.17 mol
To determine the molarity and molality of the concentrated hydrofluoric acid (HF) solution, we first need to understand what these terms mean. Molarity is defined as the number of moles of a solute per liter of solution, while molality is defined as the number of moles of a solute per kilogram of solvent. To calculate the molarity of the HF solution, we need to know the molecular weight of HF, which is 20.01 g/mol. We also need to know the density of the solution and its percent by mass. The percent by mass is given as 49.0%, which means that 49.0 g of HF is present in 100 g of the solution. To convert this to moles, we need to divide the mass by the molecular weight:
49.0 g HF ÷ 20.01 g/mol = 2.45 mol HF
Next, we need to calculate the volume of the solution. We are given the density of the solution as 1.179 g/mL, which means that 1 mL of the solution has a mass of 1.179 g. To convert this to liters, we divide by 1000:
1.179 g/mL ÷ 1000 mL/L = 0.001179 g/L
Now we can calculate the molarity of the solution:
Molarity = moles of solute / volume of solution
Molarity = 2.45 mol / 0.001179 L
Molarity = 2073.1 M
To calculate the molality of the solution, we need to know the mass of the solvent, which is the difference between the mass of the solution and the mass of the solute. We know that the mass of the solute (HF) is 49.0 g, so we need to calculate the mass of the solution. To do this, we can use the density of the solution:
Density = mass / volume
mass = density × volume
mass = 1.179 g/mL × 1000 mL
mass = 1179 g
Now we can calculate the mass of the solvent:
mass solvent = mass solution - mass solute
mass solvent = 1179 g - 49.0 g
mass solvent = 1130 g
To calculate the molality, we divide the number of moles of solute by the mass of the solvent in kilograms:
Molality = moles of solute / mass of solvent (in kg)
Molality = 2.45 mol / 1.13 kg
Molality = 2.17 m
Therefore, the molarity of the concentrated HF solution is 2073.1 M, and its molality is 2.17 m.
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Some bacteria live in the roots of plants like soybeans and peas.
Bacteria growing on plant roots.
What is the role of these bacteria in the nitrogen cycle?
to absorb nitrogen-containing compounds from the soil
to release free nitrogen into the atmosphere
to break down nitrogen-containing compounds in dead organisms
to convert free nitrogen into usable nitrogen
70 points!
Answers
Answer:
to release free nitrogen into the atmosphere. This is the answer.
Answer:
to convert free nitrogen into usable nitrogen
Explanation:
got it right on the test boi
Which postulate of john dalton's atomic theory was quickly proved wrong by jj thomson and robert millikan?
Answers
The postulate oh John Dalton's atomic theory that was quickly proved wrong by JJ Thomson and Robert Mullikan was that atoms are indivisible.
Dalton was the first scientist to give a theory about atoms in which he gave several postulates like
1) Atoms of same particles are identical in shape, size and color.
2) Atom is the smallest unit of any matter.
3) Atoms can neither be created nor be destroyed.
4) Atoms of different elements combine with each other in fixed number or ratios to give new molecules.
Although Dalton's model initially got much appreciation but one postulate that is atoms is the smallest unit of any matter which means atoms are indivisible was proved wrong by JJ Thomson through his discovery of of electrons and by Robert Millikan through his discovery of the elementary charge of an electron.
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How many Al atoms are there in 40.5 g of Al foil? Al:27
A) 6.02×10²³
B) 3.01×10²³
C) 9.03×10²³
D) 1.20×10²⁴
Answers
Answer:
c) 9.03 x 10^23
Explanation:
find the molar mass of Al
Al is 27.0 grams
Then use that, to find the number of moles in Aluminum.
Then use Avogadro's number which is 6.02 * 10^23
After that, write all of that down with dimensional analysis.
40.5 g * 1 mol/ 27.0 g of Al * 6.02 x 10^23 / 1mol
As your final answer, you will get 9.03 * 10^23 atoms with sig figs.
Hope it helped!
HELP!!!!!! 20 POINTS
step 2 on the performance task thing.
C) Judge the closeness of your trend line to the data points. Do you notice a relationship between the data points? (2 points)
D) Is the trend line linear? If so, write a linear equation that represents the trend line. Show your work.
Answers
I believe that the answer is C
PLEASE HELP ME ASAAAAPPPPPPPPPPPPPP!!!!!!!!!!!!!!!!!!!!!!!
Balance the chemical equation using the algebraic method.
C4H10+O2=CO2+H2O
SHOW YOUR WORK PLEASEEEEEEEEE
Answers
C4H10 + 6.5O2 = 4CO2 + 5H2O
Then multiply it all by 2 so you can make 6.5 13
how do isotopes of a given element differ?
Answers
Answer:
they have different mass numbers
Explanation:
4 NH3 + 5 O2 - 4 NO + 6 H20
Given 20 moles of O2 and 14 moles of NH3, which would act as the limiting reactant?
Answers
NH₃ as the limiting reactant
Further explanationGiven
Reaction
4 NH3 + 5 O2 ⇒ 4 NO + 6 H20
Required
The limiting reactant
Solution
To find the limiting of the reactants, we can use the method by dividing the moles of each reactant by the reaction coefficient. The smallest ratio will be the limiting reactants
the mol ratio of NH₃ : O₂ =
=14/4 : 20/5
= 3.5 : 4
So NH₃ as the limiting reactant
What happens when the volume is decreased according to Le Chatelier's principle?
Answers
When the volume is decreased, according to Le Chatelier's principle, the equilibrium will shift to the side with fewer moles of gas.
This is because reducing the volume means there is less space for the gas molecules to move around, which causes an increase in pressure. Therefore, the system will shift in the direction that reduces the number of gas molecules, which will ultimately result in an equilibrium that is reestablished. This phenomenon can be explained by Le Chatelier's principle, which states that when a system is subjected to a stress, it will respond in a way that minimizes the stress.
In this case, the stress is the increase in pressure due to the decreased volume, and the response is a shift in the equilibrium to reduce the number of gas molecules.
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A chemical equation must be balanced. this means that the same _____ and _____ of atoms must appear on both sides of the equation.
Answers
A chemical equation must be balanced. this means that the same number and type of atoms must appear on both sides of the equation .
In other words, both sides of the reaction have an equal balance of mass and charge. The amount and types of atoms on both sides of the reaction arrow must match for the chemical equation to be balanced.
To comply with the law of conservation of mass, which stipulates that matter cannot be generated or destroyed in a closed system, chemical equations must be balanced.
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Non-ferrous metal is NOT hardenable by heat treatment; it must
gain strength through a process such as tempering. Is this
statement TRUE or FALSE?
Group of answer choices
True
False
Answers
The statement is FALSE. Non-ferrous metals can be hardened by heat treatment, although the mechanisms and processes involved may differ from ferrous metals.
Heat treatment techniques such as precipitation hardening can be used to increase the strength of non-ferrous metals. Non-ferrous metals are metals or alloys that do not include iron (or iron allotropes, such as ferrite, etc.) in significant quantities. Non-ferrous metals are employed because they have desired qualities like reduced weight (for example, aluminium), greater conductivity (for example, copper), non-magnetic characteristics, or corrosion resistance (for example, zinc), even though they are often more expensive than ferrous metals. In the iron and steel sectors, several non-ferrous materials are also employed. Bauxite, for instance, is used as a flux in blast furnaces, whereas wolframite, pyrolusite, and chromite are utilised to create ferrous alloys.
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how many moles of aluminum nitrate are obtained from the reaction of 0.75 mol of silver nitrate with a sufficient amount of aluminum?
Answers
The balanced chemical equation for the reaction between aluminum and silver nitrate is:
2 Al + 3 AgNO3 → 3 Ag + 2 Al(NO3)3
From the equation, we can see that 3 moles of aluminum nitrate (Al(NO3)3) are produced for every 3 moles of silver nitrate (AgNO3) consumed.
Therefore, if 0.75 moles of silver nitrate react, we can calculate the number of moles of aluminum nitrate produced as follows:
0.75 mol AgNO3 x (2 mol Al(NO3)3 / 3 mol AgNO3) = 0.50 mol Al(NO3)3
So, 0.50 moles of aluminum nitrate (Al(NO3)3) are obtained from the reaction of 0.75 mol of silver nitrate with a sufficient amount of aluminum.
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Question to pomis)
A metal tank contains four gases: oxygen, helium, argon, and nitrogen. If the partial pressures of the three gases in the tank
are 35 atm of O2, 5 atm of N2, and 25 atm of He and the total pressure is 66 atm, what is the partial pressure of argon
inside of the tank?
Answers
To find the partial pressure of argon inside the tank, we can use the fact that the total pressure is the sum of the partial pressures of all the gases present.
Total pressure = Partial pressure of oxygen + Partial pressure of helium + Partial pressure of argon + Partial pressure of nitrogen
Given:
Partial pressure of oxygen = 35 atm
Partial pressure of helium = 25 atm
Partial pressure of nitrogen = 5 atm
Total pressure = 66 atm
Let's solve for the partial pressure of argon:
66 atm = 35 atm + 25 atm + Partial pressure of argon + 5 atm
To isolate the Partial pressure of argon, we rearrange the equation:
Partial pressure of argon = 66 atm - (35 atm + 25 atm + 5 atm)
Partial pressure of argon = 66 atm - 65 atm
Partial pressure of argon = 1 atm
Therefore, the partial pressure of argon inside the tank is 1 atm.
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When evaluating a paper delivery, a homeowner would be most concerned about ____. a. the accuracy of the throws c. the speed of the throws b. the precision of the throws d. the acceleration of the throws Please select the best answer from the choices provided
Answers
Answer:
b. the precision of the throws
Explanation:
When dealing with paper delivery homeowners are mainly concerned about the precision of the throws. They technically want the paper to land directly on their front door. Landing there, the paper will be protected from the rain and be visible for the homeowner to easily see it and pick it up in the morning when they wake up. Bad precision can lead the paper to fall into a puddle or on the grass where it will get wet and become useless or even end up breaking a window or other fragile items.
Problem: Co3+ | Co2+ and Ni2+ | NiAnode?Cathode?(You need to use Reference Table B-16.)a. Co2+b. can't answerc. Ni2+d. Nie. Co3+
Answers
Answer:
- Anode: Co3+ | Co2+
- Cathode: Ni | Ni2+
Explanation:
The anode is where oxidation reaction occurs, and the cathode is where reduction reaction occurs.
From the table of reduction potencials, we find that:
- Co reaction:
\(\begin{gathered} Co^{3+}+2e^-\rightarrow Co^{2+} \\ E=1.81\text{ }V \end{gathered}\)- Ni reaction:
\(\begin{gathered} Ni\rightarrow Ni^{2+}+2e^- \\ E=-0.250\text{ V} \end{gathered}\)Now, to find out which one is the anode and which one is the cathode, it is necessary to compare the reduction potencials.
The reaction of Ni have negative potentials, so Ni will be the anode and Co will be the cathode.
What is the percentage composition of each element in dinitrogen monoxide, N20?
Answers
Answer:
28/44*100%=63.6%
Explanation:
the gram formula mass of N20 is 14*2+16=44.The mass of two nitrogen atom is 14*2=28,so the percentage is that 28/44*100%=63.6%.
Does a subject-based aesthetic apply to a work the is realistic in its portrayal of the subject?
Answers
A subject-based aesthetic refers to the idea that the artistic value of a work is dependent on the subject matter that it depicts. In other words, the more meaningful or important the subject matter, the more valuable the work of art.
This aesthetic is often associated with abstract or conceptual art, where the subject matter is not immediately apparent and requires interpretation. However, this aesthetic can also apply to realistic portrayals of subjects. For example, a painting that depicts a historical event or a significant cultural moment may be seen as having more artistic value than a painting of a simple still life.
The level of detail and accuracy in the depiction of the subject can also be considered when evaluating the artistic value of a realistic work. Overall, the subject-based aesthetic can be applied to both abstract and realistic works of art. It is important to consider the significance and meaning behind the subject matter when evaluating its artistic value.
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Crabs are organisms that have five pairs of legs. In certain species of crabs, the fifth pair of legs has a flattened, paddle-like shape. Which of the statements below best explains how this adaptation has evolved?
A.Crabs were exposed to a toxin in the water.
B.Crabs with this adaptation have an advantage over other crabs to defend against predators in oyster beds.
C.Crabs needed this adaptation to dig into sand to find food so they developed the flattened paddle-like shape.
D.Crabs developed this adaptation because they needed to climb mangrove trees to hide themselves from predators.
Answers
Answer:
A
Explanation:
Crabs were exposed to a toxin in the water.