For aluminum, Al, the heat of fusion at its normal melting point of 660 °C is 10.8 kJ/mol.

The entropy change when 1.74 moles of solid Al melts at 660 °C, 1 atm is __J/K.

Answer:

heat transfer is when you transfer heat from one thing to another and heat transformation is when heat is transforming into something else hope it helps

Explanation:

Answer:

Explanation: l m n o p q r s t u v w x y z

Brainpop is an educational platform that offers animated videos and interactive quizzes on various subjects, including science, history, and mathematics. One of the topics covered on Brainpop is bacteria.
True Brainpop offers information on bacteria.

The answer to this question is true. Brainpop has a section dedicated to bacteria, where students can learn about different types of bacteria, their characteristics, and their role in the environment and human health.
Through animated videos, students can learn about the structure of bacteria, how they reproduce, and how they play a role in nutrient cycling. The platform also provides interactive quizzes and activities to test students' knowledge on the topic.
Overall, Brainpop is a useful tool for students to learn about bacteria and other scientific concepts in an engaging and interactive way.

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Note- The Question seems Incomplete, and complete question isn't available in the search engine.

Answer:

In both natural and built systems, stability and change are an important focus of study for both scientists and engineers. Stability refers to a system that is unchanging. ... A dynamic equilibrium exists when chemical reactions or physical movements occur at rates that balance out, creating no net change in a system.

Answer:

In both natural and built systems, stability and change are an important focus of study for both scientists and engineers. Stability refers to a system that is unchanging. ... A dynamic equilibrium exists when chemical reactions or physical movements occur at rates that balance out, creating no net change in a system.

Explanation:

To reach break point chlorination in a 96,000 gallon pool with a difference of 0.4 ppm between the free chlorine and total chlorine levels, approximately 7.68 ounces of chlorine is needed.

To calculate the amount of chlorine needed to reach break point chlorination in a 96,000 gallon pool, we first need to find the difference between the total chlorine and free chlorine levels. Break point chlorination is achieved when the free chlorine level equals the total chlorine level.

Given that the free chlorine level is 1.4 ppm and the total chlorine level is 1.8 ppm, the difference between them is:

1.8 ppm - 1.4 ppm = 0.4 ppm

Now, we need to determine the amount of chlorine required to raise the free chlorine level by 0.4 ppm in a 10,000 gallon pool. The given information states that it takes 2 ounces of dry chlorine (67% concentration) to raise a 10,000 gallon pool's chlorine level by 1 ppm.

To calculate the amount of chlorine required to raise the free chlorine level by 0.4 ppm in a 10,000 gallon pool, we can set up a proportion:

2 ounces / 1 ppm = X ounces / 0.4 ppm

Solving for X (the amount of chlorine needed for 0.4 ppm increase in a 10,000 gallon pool):

X = (2 ounces / 1 ppm) * 0.4 ppm = 0.8 ounces

Now, we can calculate the amount of chlorine needed for the 96,000 gallon pool by scaling the chlorine required for the 10,000 gallon pool:

Amount of chlorine needed = (0.8 ounces / 10,000 gallons) * 96,000 gallons

Amount of chlorine needed = 0.8 ounces * 9.6 = 7.68 ounces

Therefore, approximately 7.68 ounces of chlorine is needed to reach break point chlorination in the 96,000 gallon pool.

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a. Probability (X = 3) = 0.180

b. Probability(X < 3) = 0.676

c. Probability(X >= 3) =  0.324

d. Probability (X >= 1) =  0.865

e. Probability (X >= 5) =  0.0525

(a)  we find the Probability of exactly three insect fragments in a 4-gram sample as :

λ = 0.5 * 4 = 2

P(X = 3) = (e^(-2) * 2^3) / 3!

P(X = 3) =  0.180

(b) Probability of fewer than three insect fragments in a 4-gram sample:

P(X < 3) = P(X = 0) + P(X = 1) + P(X = 2)

P(X < 3) = e^(-2) + (e^(-2) * 2) + (e^(-2) * 2^2)

P(X < 3) = 0.676

(c) Probability of at least three insect fragments in a 4-gram sample:

P(X >= 3) = 1 - P(X < 3)

P(X >= 3) ≈ 1 - 0.676

P(X >= 3) =  0.324

(d) Probability of at least one insect fragment in a 4-gram sample:

P(X >= 1) = 1 - P(X = 0)

P(X >= 1) ≈ 1 - e^(-2)

P(X >= 1) =  0.865

e. The Unusualness of containing five or more insect fragments is found as :

P(X >= 5) = 1 - (P(X = 0) + P(X = 1) + P(X = 2) + P(X = 3) + P(X = 4))

P(X >= 5) = 1 - (0.1353 + 0.2707 + 0.2707 + 0.1805 + 0.0903)

P(X >= 5) ≈ 1 - 0.9475

P(X >= 5) =  0.0525

In conclusion, the probability of a 4-gram sample of this supply of peanut butter containing five or more insect fragments is found to be 0.0525.

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Answer:

111. C .  M2O3

112. A. 5

Answer:

University of University of South New York Jersey has is a the best in the world the most important most important aspect of aspect of life is life and marriage is in my a lot more of a urban

Answer:

Endothermic animals are those that must generate their own heat to maintain an optimal body temperature.

Explanation:

Answer:

There

Explanation:

Endothermic animals are those that must generate their own heat to maintain an optimal body temperature. In ordinary language, these animals are commonly referred to as "warm-blooded." The term endotherm comes from the Greek endon, meaning within, and thermos, which means heat

Answer:

474. 64 mm Hg

Explanation:

using Boyle's Law that is

P1. V1 = P2. V2

655 × 10 = P2 × 13. 8

\(P2 = \frac{655 \times 10}{13.8} \)

P2 = 474. 64 mm Hg

The equation is correctly balanced is option C is correct 2H₂ + O₂ → 2H₂O

A balanced equation is a chemical equation in which mass is conserved and there are equal numbers of atoms of each element on both sides of the equation

Here in the given reaction option C is correct because 4 atoms of hydrogen on reactant side. 2 atoms of oxygen on reactant side

2H₂ + O₂ → 2H₂O

And the other reaction is not balanced reaction because in reactant side or in product side there is difference so it is not balanced

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The kinds of the solids are;

SiO2 - Covalent network solid

C6H12O6 - Covalent solid

KI - Ionic solid

A covalent network solid, often referred to as a network covalent solid or just a network solid, is a category of solid material in which the atoms that make up the material are strongly covalently linked to one another, forming an extended three-dimensional network structure.

Covalent network solids are kept together by a dense network of covalent bonds, as opposed to molecular or ionic solids, which are held together by weaker intermolecular forces or ionic interactions, respectively.

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The incorrect statement regarding the reaction between aqueous solutions of aluminum nitrate, Al(NO3)3, and ammonium carbonate, (NH4)2CO3, which form a precipitate of aluminum carbonate, Al2(CO3)3 is If 0.5 mole of (NH4)2CO3 react with sufficient Al(NO3)3, 3 moles of Al2(CO3)3 will be formed. Option C.

A chemical equation is a description of the chemical reaction that takes place. It contains the formulae of the reactants and products separated by an arrow. The arrow indicates the direction of the reaction. The stoichiometric coefficients in the equation represent the number of moles of each substance involved in the reaction.

Stoichiometry is a branch of chemistry that deals with the quantitative relationships between reactants and products in a chemical reaction. It's important to keep in mind that the law of conservation of mass applies to chemical reactions. This means that the number of atoms of each element present in the reactants must equal the number of atoms of that element present in the products. Thus, stoichiometry plays a significant role in determining how much product is formed from a given amount of reactant and vice versa. Option C.

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Answer:

There is only one stable atom that does not have neutrons. It is an isotope of the element hydrogen called protium. Protium, which contains a single proton and a single electron, is the simplest atom. All other stable atoms contain some number of neutrons. hope this helps you :)

If NH is introduced to the system, equilibrium is restored as the reaction moves towards the reactants. Option A is correct.

According to Le Chatelier's principle, if a stress is applied to a system at equilibrium, the system will adjust in a way that partially offsets the effect of the stress and restores equilibrium. The reaction:

3H₂ (g) + N₂ (g) ⇌ 2NH₃ (g) + 92 kJ

In this case, adding NH₃ to the system would increase the concentration of products, causing the equilibrium to shift towards the reactants in order to reduce the excess products.

This means that the forward reaction (production of NH₃) would slow down, while the reverse reaction (breakdown of NH₃) would speed up until equilibrium is re-established. Since the forward reaction is exothermic (heat-releasing), increasing the concentration of reactants by shifting the equilibrium towards the left would also decrease the heat energy in the system, helping to partially offset the addition of NH₃. Option A is correct.

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Answer:

132g

Explanation:

CH4= 12+4=16  

moles= m/Mr    moles=48/16=3 mol

CO2= Mr=44

there are the same number of moles as methane:

Mass= Mrxmoles

44x3=132g

The mass of the carbon dioxide produced by the combustion of the 48 g of methane is equal to 132 g.

Combustion reaction involves the complete oxidation of the hydrocarbon such reactions generally release only carbon dioxide and water as products.

A hydrocarbon undergoes combustion to produce carbon dioxide and water as the product. No other side products are formed in the combustion reaction.

The given combustion reaction of the methane can be written as follows:

CH₄   + 2 O₂ →  CO₂  +  2H₂O

Given the amount of methane for combustion = 48 g

The molar mass of methane = 16g/mol

The molar mass of the carbon dioxide, CO₂ = 44g/mol

16 grams of methane produce carbon dioxide = 44g

The  48 grams of methane will produce CO₂ = (44/16) ×48 = 132 g

Therefore, the mass of 132 g of carbon dioxide is produced by the combustion of 48g of methane.

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Answer:

nuclear energy

Explanation:

this holds the nucleus together

The given redox reaction is:

Cr2O7^2- + C2H4O → C2H4O2 + Cr3+

To balance this reaction, we first balance the oxygen atoms by adding H2O on the right side of the equation. The number of H2O molecules added depends on the number of oxygen atoms needed. In this case, we need three O atoms on the right side, so we add three H2O molecules to the right side of the equation:

Cr2O7^2- + C2H4O → C2H4O2 + Cr3+ + 3H2O

Next, we balance the hydrogen atoms by adding H+ ions on the left side of the equation. The number of H+ ions added depends on the number of hydrogen atoms needed. In this case, we need eight H atoms on the left side, so we add eight H+ ions to the left side of the equation:

Cr2O7^2- + C2H4O + 8H+ → C2H4O2 + Cr3+ + 3H2O

Finally, we balance the charge by adding electrons. The number of electrons added depends on the difference in charge on the left and right side of the equation. In this case, the left side has a charge of -2 (from the Cr2O7^2- ion), while the right side has a charge of +3 (from the Cr3+ ion). This means that we need to add 5 electrons to the left side of the equation to balance the charge:

Cr2O7^2- + C2H4O + 8H+ + 5e- → C2H4O2 + Cr3+ + 3H2O

Therefore, the coefficient for water molecules in the balanced version of the given redox reaction is 3.

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Answer:

4332.5 j

Explanation:

Specific heat of water is 4.186 j /g-C

4.186 j / g-C  * 75 g  * (36.1-22.3 C) =

Answer:

false

Explanation:

it happens in light-independent reactions

Answer:

One Hectometer is 10,000 centimeters. So multiply your hectometer by 10,000, and that's your conversion. Your answer is 590.

Answer:

Transform boundaries because they're sliding past each other.

I hope this helped!

1s²2s²2p¹.

Explanation:

The electronic configuration of Boron is 1s²2s²2p¹ .

The electron configuration for boron is 1s²2s²2p¹.

Electron configuration of an element describes how electrons are distributed in its atomic orbitals. Electron configurations of atoms follow a standard notation in which all electron-containing atomic subshells (with the number of electrons they hold written in superscript) are placed in a sequence.

Electron configuration can be written according to the following rules-

1. Aufbau Principle

2. Pauli's exclusion principle

3. Hund's rule

Electrons will be filled according to the increasing order of the energy as per the n+l rule. Boron has atomic number as 5 that means it has 5 electrons.

Therefore, The electron configuration for boron is 1s²2s²2p¹.

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Answer:

Geologists commonly consider faults to be active if there has been movement observed or evidence of seismic activity during the last 10,000 years. Active faulting is considered to be a geologic hazard - one related to earthquakes as a cause.

Explanation:

Plz mark brainliest thanks

Theoretical yield of copper is 7.22 g when 4.25g of iron in the chemical reaction.

2Fe(s) + 3Cu2(aq.) ---->  2Fe3(aq.)  + 3Cu (s)

Molar mass of Iron (Fe) is 56g/mole.

Molar mass of copper (cu) is 63.5g/mole.

2 mole ( 2 * 56g/mole) Iron produces = 3 mole ( 3 * 63.5g/mole ) copper

Theoretical yield is the maximum amount of product that could be formed from the given amounts of reactants. The actual yield is the amount of product that is actually formed when the reaction is carried out in the laboratory. The theoretical yield is the amount of product that would be formed from a reaction if it was 100% efficient.

There are 4. 25 g of Iron .so,

4.25 g Iron produces = (3 * 63.5g / 2 * 56 g ) * 4.25 g copper

                                     = 7.22 g copper

Theoretical yield of copper is 7.22g.

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The equilibrium concentration in mol/L for Sr₂+ ions with Ksp value Sr(IO3)2 = 2.30E-13 is 7.04E-9 M.

The balanced chemical equation for the reaction that occurs between Sr(NO₃)₂ and KIO₃ is:

Sr(NO₃)₂ + 2 KIO₃ → Sr(IO₃)₂ + 2 KNO₃

Using the stoichiometry of the balanced equation, we can see that for every 1 mole of Sr(NO₃)₂ that reacts, 1 mole of Sr(IO₃)₂  is formed. Therefore, the initial concentration of Sr₂+ ions is 0.600 M, and the concentration of IO₃- ions is 2 × 1.60 M = 3.20 M (because 2 moles of KIO₃ are used for every mole of Sr(NO₃)₂).

The solubility product expression for Sr(IO₃)₂ is:

Ksp = [Sr₂+][IO₃-]²

At equilibrium, the concentration of Sr₂+ ions will be x (in mol/L), and the concentration of IO₃- ions will be 3.20 - 2x (in mol/L) because 2 moles of IO₃- are used for every mole of Sr(IO₃)₂ that forms. The concentration of NO3- ions can be ignored because they are spectator ions and do not participate in the equilibrium.

Substituting these concentrations into the Ksp expression gives:

2.30E-13 = x(3.20 - 2x)²

Solving this equation for x gives:

x = 7.04E-9 M

Therefore, the equilibrium concentration of Sr₂+ ions is 7.04E-9 M.

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Naming Ionic compounds with transition metals requires the use of a roman numeral. The charge of the metal ion must be written in the name of the compound with a roman numeral. This is because transition metals can have more than one valence (or charge).