Is the brass making the water get hotter, or is the water making the brass get colder? Is energy transferring from the water to the brass or the other way around? Why do you say this?

(Use science terminology and talk about thermal equilibrium and the particle theory)

Answer:

K = 10

Explanation:

Using Hess's law, it is possible to obtain the equilibrium constant, K, of a reaction using K of similar reactions. For example:

If A ⇄ B K = X

B ⇄ A K = 1/X

2A ⇄ 2B K = X².

Thus, if A(g) ⇄ 2B(g) K = 0.010

2B(g) ⇄ A(g) K = 1 / 0.010; K = 100

B(g) ⇄ A(g) K = √100 = 10

Answer:

14.8 g

Explanation:

step 1 You first have to convert the cm^3 to dm^3 by dividing the volume by 1000 then find the number of mols for Hydrogen gas

from there you can use the of moles for hydrogen to find the moles of the metal step 2

then step 3 you multiply the number of by The Mr or Fr giving you your mass

Ammonium hydroxide is a weak base because c. it dissociates only slightly in water.

When dissolved in water, ammonium hydroxide donates a proton to form the ammonium ion and hydroxide ion. However, this reaction is only partially reversible because the ammonium ion is not a strong enough acid to accept a proton and regenerate the ammonium hydroxide. Therefore, the hydroxide ion concentration in the solution is relatively low, making it a weak base. In chemistry, a substance is referred to as a base if it has the ability to accept protons (H+ ions).

Ammonium hydroxide is a weak base because, when dissolved in water, it donates a proton to form the ammonium ion (NH4+) and hydroxide ion (OH−). This reaction is reversible, as represented by the chemical equation below: NH4+ (aq) + OH− (aq) ⇌ NH3 (aq) + H2O (l)However, this reaction is only partially reversible because the ammonium ion is not a strong enough acid to accept a proton and regenerate the ammonium hydroxide. Therefore, the hydroxide ion concentration in the solution is relatively low, making it a weak base.

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Answer:

the one at the bottom

Explanation:

the more dense an object is in this kind of demonstration (which is called a density tower btw) the lower it'd be so taking this reason into consideration the lowest would be the densest

Answer:

c = 0.79 j/g.K

c = 1 j/g.K

T2 = 123.1 K

Explanation:

1)

Given data:

Mass of metal = 450 g

Heat loses = 34,500 j

Temperature drop = ΔT  = 97 K

Specific heat of metal = ?

Solution:

Specific heat capacity:

It is the amount of heat required to raise the temperature of one gram of substance by one degree.

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

34500 j = 450 g ×c × 97 K

34500 j = 43650 g.K ×c

c = 34500 j/43650 g.K

c = 0.79 j/g.K

2)

Given data:

Mass of metal = 25 g

Heat loses = 2600 j

Temperature drop = ΔT  = 103 K

Specific heat of metal = ?

Solution:

Specific heat capacity:

It is the amount of heat required to raise the temperature of one gram of substance by one degree.

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

2600 j = 25 g ×c × 103 K

2600  j = 2575 g.K ×c

c = 2600 j/2575 g.K

c = 1 j/g.K

3)

Given data:

Mass of water = 10 g

Heat absorbed  = 840 j

Initial temperature drop = 298 K

Final temperature = ?

Solution:

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

ΔT = T2 - T1

840 j = 10 g ×4.18 j/g.K × [T2 - 103 K]

840 j = 41.8 J/K ×  [T2 - 103 K]

840 J/41.8 J/ K = T2 - 103 K

20.1 k = T2 - 103 K

T2 = 20.1 K + 103 K

T2 = 123.1 K

Answer:

The extraction is done by electolysis but first the aluminium oxide must be melted so that electricity can pass through it...The use of molten cryolite as a solvent reduces some of the Energy

costs involved in extracting aluminum by allowing the ions in aluminum oxide to move freely at low temperature ..

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The energy transformation which produces electricity and is least likely to

negatively impact the environment is generating electricity from a solar

panel system.

Generating electricity from solar panel involves the use of solar energy from

the sun to generate electricity . This type of energy doesn't emit any type of

harmful radiation or release toxic compounds into the atmosphere which

makes it the least likely to negatively impact the environment.

Other options emit any type of harmful radiation or release toxic compounds

into the atmosphere which makes option D the most appropriate.

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First, we need to make the exponent of 10 the same for both.

So let's transform 6.5500 x 10^5 into some number x 10^3.

For this, we need to move the dot to the right, some places where it gives the number 3. In this case, 2 places.

655.00 x 10^3

now we can sum the numbers

8.6500 x 10^3 + 655.00 x 10^3 = 663.65 x 10^3

now we need to transform this number into scientific notation. For this, must have only one number before the dot(on the left side of the dot). We will move the dot to the left, 2 places:

6.6365 x 10^5

Answer: 6.6365 x 10^5

Answer:

6.31x10^-10

Explanation:

Answer: 6.31 x 10^-10

Explanation:

The ratio of carbon bond with fluorine to form a stable compound is 1:4.

All organofluorine compounds have the polar covalent bond between fluorine and carbon known as the carbon-fluorine bond. Due to its partly ionic nature, it is one of the chemical world's strongest single bonds and is also relatively short.

It is a covalent bond between a carbon atom and a fluorine atom in a molecule. It is one of the strongest single bonds found in organic chemistry due to the high electronegativity of fluorine, which attracts electrons away from the carbon atom and makes the bond very polar.

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The substance with the most atoms per mole also has the most moles per mole. The Avogadro's number can be used to determine a substance's atom count.

12 grams of pure carbon-12 weigh exactly one mole, or 6.022 x 1023 atoms, making one mole equivalent to 12 grams of pure carbon-12. • Avogadro's Number is the quantity of particles included in one mole (6.0221421 x 1023).

This figure indicates how many atoms, molecules, and ions make up one mole of a given chemical. All you have to do is determine which chemical contains the most moles. This substance will also contain the most atoms overall.

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By filtering wastes out of the bloodstream and maintaining fluid balance, the urinary system helps to maintain homeostasis.

Homeostasis refers to the maintenance of stable internal conditions within an organism, despite changes in its external environment. It involves the coordination of multiple physiological processes that work together to maintain a steady state. Homeostasis is important for the survival of all living organisms, as it ensures that vital biological functions can continue to operate within an optimal range, even in the face of external stressors. The urinary system is just one of many systems in the body that contributes to maintaining homeostasis.

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The entropy change per mole of ethane that undergoes combustion is approximately -416.5 J/mol·K.

Balanced chemical equation for the combustion of ethane (C₂H₆) is;

C₂H₆(g) + 3.5O₂(g) → 2CO₂(g) + 3H₂O(g)

The standard entropy values (ΔS°) for the reactants and products involved in the above reaction are;

ΔS°f(C₂H₆,g) = +229.5 J/mol·K

ΔS°f(CO₂,g) = +213.6 J/mol·K

ΔS°f(H₂O,g) = +188.7 J/mol·K

ΔS°f(O₂,g) = +205.0 J/mol·K

The standard entropy change (ΔS°) for the combustion of ethane can be calculated using the following formula;

ΔS° = ΣnΔS°f(products) - ΣmΔS°f(reactants)

where n and m are the stoichiometric coefficients of the products and reactants, respectively.

Substituting the values, we get;

ΔS° = [2 × ΔS°f(CO₂,g) + 3 × ΔS°f(H₂O,g)] - [ΔS°f(C₂H₆,g) + 3.5 × ΔS°f(O₂,g)]

ΔS° = [2 × 213.6 + 3 × 188.7] - [229.5 + 3.5 × 205.0] J/mol·K

ΔS° = -416.5 J/mol·K

Therefore, the entropy change per mole of ethane that undergoes combustion is -416.5 J/mol·K.

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--The given question is incomplete, the complete question is

"Find delta s for the combustion of ethane to carbon dioxide and gaseous water. Report the entropy change per mole of ethene that undergoes combustion. Express your answer in J/mol·K."--

In the given reaction, NH3 acts as a base by accepting a proton from H2O to form NH4+. OH- is formed as a result of the H2O molecule donating a proton and acting as an acid. Option b.

In the given reaction, H2O and NH3 react to form OH- and NH4+. This is an example of an acid-base reaction, where the H2O molecule acts as an acid and donates a proton to the NH3 molecule, which in turn acts as a base and accepts the proton. The molecule that acts as a base in this reaction is NH3. This is because it accepts a proton (H+) from the H2O molecule, forming NH4+. NH3 is a weak base because it has a lone pair of electrons on the nitrogen atom, which can accept a proton and form a coordinate covalent bond. On the other hand, H2O acts as an acid because it donates a proton to NH3, forming OH-. H2O is a weak acid because it has a partial positive charge on the hydrogen atom, which can be donated to a base. Option b.
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The subshell represented by the lanthanides series is the 4f subshell.

Lanthanides are a group of 15 metallic elements with atomic numbers 57 through 71, starting with Lanthanum (La) and ending with Lutetium (Lu). These elements are characterized by their filling of the 4f subshell, which can hold a maximum of 14 electrons.

The progressive filling of this 4f subshell as you move through the lanthanide series leads to unique chemical and physical properties, such as high electron density and strong magnetic properties. The partially filled 4f subshell also contributes to the elements' variable oxidation states and their ability to form stable complexes with various ligands. Overall, the lanthanides series highlights the significance of the 4f subshell in determining the properties of these rare earth elements.

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The molar heat capacity of a substance is the amount of heat needed to change the temperature of 1 mol of that substance by 1 K.

The molar heat capacity of a substance is a physical property that describes the amount of heat energy required to raise the temperature of one mole of the substance by one Kelvin (or one degree Celsius). It is typically denoted by the symbol Cm and has units of joules per mole per Kelvin (J/(mol K)).

The molar heat capacity of a substance depends on various factors such as the nature of the substance, its phase (solid, liquid, or gas), and the conditions under which the temperature change occurs (constant pressure or constant volume).

For example, the molar heat capacity of a gas at constant pressure is usually greater than its molar heat capacity at constant volume, because the gas is allowed to expand and do work on its surroundings at constant pressure, which requires additional energy input.

The molar heat capacity is an important property in thermodynamics and is used in many calculations involving heat transfer, energy conversion, and chemical reactions. It is also used to determine the specific heat capacity of a substance, which is the amount of heat energy required to raise the temperature of a unit mass of the substance by one Kelvin (or one degree Celsius).

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Answer:

1.) 2 Mg + H₂ ------> 2 MgH

2.) 2 K + O₂ -----> 2 KO

3.) K + S -----> KS

4.) 2 Ba + Br₂ -----> 2 BaBr

5.) 2 Ca + N₂ ------> 2 CaN

Explanation:

An equation is balanced when there is an equal amount of each element on both sides of a reaction. If there is an unequal amount, they can be altered by adding coefficients which modify the amount of an element/molecule. It is important that the coefficients are as small as possible while staying as whole numbers.

1.) ------------------------------------------------------------------------------------------------------

The unbalanced equation:

Mg + H₂ -----> MgH

Reactants: 1 magnesium, 2 hydrogen

Products: 1 magnesium, 1 hydrogen

The balanced equation:

2 Mg + H₂ ------> 2 MgH

Reactants: 2 magnesium, 2 hydrogen

Products: 2 magnesium, 2 hydrogen

2.) ------------------------------------------------------------------------------------------------------

The unbalanced equation:

K + O₂ -----> KO

Reactants: 1 potassium, 2 oxygen

Products: 1 potassium, 1 oxygen

The balanced equation:

2 K + O₂ -----> 2 KO

Reactants: 2 potassium, 2 oxygen

Products: 2 potassium, 2 oxygen

3.) ------------------------------------------------------------------------------------------------------

The unbalanced equation:

K + S -----> KS

Reactants: 1 potassium, 1 sulfur

Products: 1 potassium, 1 sulfur

This equation is already balanced with all the elements/compounds having coefficients of 1.

4.) ------------------------------------------------------------------------------------------------------

The unbalanced equation:

Ba + Br₂ -----> BaBr

Reactants: 1 barium, 2 bromine

Products: 1 barium, 1 bromine

The balanced equation:

2 Ba + Br₂ -----> 2 BaBr

Reactants: 2 barium, 2 bromine

Products: 2 barium, 2 bromine

5.) ------------------------------------------------------------------------------------------------------

The unbalanced equation:

Ca + N₂ ------> CaN

Reactants: 1 calcium, 2 nitrogen

Products: 1 calcium, 1 nitrogen

The balanced equation:

2 Ca + N₂ ------> 2 CaN

Reactants: 2 calcium, 2 nitrogen

Products: 2 calcium, 2 nitrogen

Answer:

Combustion is a rapid exothermic chemical reaction between oxygen, O₂, and a substance which is known as the fuel that is initiated by an ignition (heat) source to produce carbon dioxide and water vapor other oxides and combustion products

With the continuous model, which is the model seen with the naked eye, that have uniform parts, the combustion of coal that produces no flammable vapors and hence no flame, the combustion of hydrogen gas which is nearly colorless and the combustion of gasoline that produces a bright flame, burns without flame will be taken as different processes

Explanation:

Hydrogen bonds are also directional, meaning that they have a specific orientation in space. This directional nature allows for a strong interaction between two atoms or molecules, which increases the strength of the bond. Overall, the combination of high polarity, small size, and directional nature makes hydrogen bonds the strongest of the intermolecular forces.

Intermolecular forces are forces that exist between atoms and molecules and hold them together. These forces affect the physical properties of substances such as boiling point, melting point, and viscosity. Hydrogen bonds are one of the strongest intermolecular forces, and this can be attributed to several factors.The strength of a hydrogen bond can be explained by its electrostatic nature. A hydrogen bond is formed between a hydrogen atom bonded to an electronegative atom and another electronegative atom. This creates a partial positive charge on the hydrogen atom and a partial negative charge on the electronegative atom. The partial charges attract each other and create a bond between the two atoms. This electrostatic attraction is strong, which is why hydrogen bonds are strong.One factor that contributes to the strength of hydrogen bonds is the high polarity of the bond. Since hydrogen has a low electronegativity, it has a high electron density, making it a good candidate to form hydrogen bonds. Another factor that contributes to the strength of hydrogen bonds is the small size of hydrogen atoms. The small size of the hydrogen atom allows it to be closer to the other atom, which increases the electrostatic attraction and makes the bond stronger.Hydrogen bonds are also directional, meaning that they have a specific orientation in space. This directional nature allows for a strong interaction between two atoms or molecules, which increases the strength of the bond.Overall, the combination of high polarity, small size, and directional nature makes hydrogen bonds the strongest of the intermolecular forces.

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The solubility of compounds such as sucrose, histidine, gelatin, and vegetable oil is biologically relevant due to various reasons. Solubility affects nutrient absorption, cellular processes, transport and distribution of molecules, structural and functional roles of biomolecules, and biological interactions.

Solubility facilitates the digestion and absorption of nutrients, enables cellular reactions and enzymatic processes, influences nutrient transport and distribution within organisms, contributes to the structural and functional properties of biomolecules, and impacts molecular interactions within biological systems. Understanding the solubility of these compounds enhances our understanding of biological mechanisms and aids in the development of therapeutic and nutritional approaches.

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In the malate–aspartate shuttle, electrons are transferred from oxaloacetate to form malate.

A crucial mechanism employed by mitochondria, the malate-aspartate shuttle system, also known as the malate shuttle, enables electrons to pass through the impermeable membrane separating the cytosol as well as the mitochondrial matrix. Glycolysis produces the electrons which are required for oxidative phosphorylation.

The liver, heart, as well as kidney, include the malate-aspartate shuttle, which produces about three molecules of ATP for every cytosolic NADH molecule.  Under aerobic conditions, it constitutes quantitatively the most significant shuttle for such reoxidation of cytosolic NADH in vertebrate tissues.

Therefore, In the malate–aspartate shuttle, electrons are transferred from oxaloacetate to form malate.

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The additional information that is required to obtain the enthalpy of neutralization is the density of the solution.

We know that the enthalpy of neutralization is defined as the heat that is evolved when  an acid is neutralized by a base under standard conditions. We can be able to obtain the enthalpy of the neutralization of the acid and the base by performance of some simple chemical calculations.

To carry out this calculations we need the all of the pieces of information that have been listed in the question such as the masses of the solution, the temperature of the solution in the initial and final states and so on.

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Answer:

thermal shock

Explanation:

the temperatures inside the glass jar should have continued to increase over time. Internal stresses due to uneven heating. This is also known as “thermal shock”.

In general, the thicker the glass, the more prone it will be to breaking due to the immediate differences in temperature across the thickness of glass.

Borosilicate glass is more tolerant of this, as it has a higher elasticity than standard silicon glass.

You may also note that laboratory test tubes and flasks are made with thinner walls, and of borosilicate glass, when designated for heating.

Electromagnetic radiation is reflected or absorbed mainly by several gases in the Earth's atmosphere, among the most important being water vapor, carbon dioxide, and ozone. Some radiation, such as visible light, largely passes (is transmitted) through the atmosphere.

Water striders use the high surface tension of water and long, hydrophobic legs to help them stay above water.

Surface tension:

The tension of the surface film of a liquid is caused by the attraction of the particles in the surface layer by the bulk of the liquid, which tends to minimize surface area.

The force responsible for surface tension is the cohesive force that is present between the molecules of the liquid, the surface tension of water is high this is just because there is a hydrogen bond present between the molecules of water.

As we know that the legs of a water strider are long and slender, allowing the weight of the water strider's body to be distributed over a larger surface area.

Therefore the water strider can land on the surface of the water because of the surface tension of the water.

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Answer:

B, D, C

Explanation:

the solution may have more than one solute, a solution is a homogenous mixture of 2 or more substances and not all solutions are liquid

A solution is formed by the mixture of substances dissolved in water. There may have more than one solute. Not all solutions are liquid but there exists solid solutions too. Hence, options A, B, C are correct.

A solution is a combination of a solvent and a solid solute. The solute can be completely dissolved in the solvent and can have a partial solubility.

Water is a good solvent which dissolve majority of compounds. But there are other solvents too forming solution with suitable solutes. Solutions can be homogenous or heterogenous. Homogenous solutions are forming one phase and the solute particles are uniformly arranged.

Heterogeneous solutions are those where the solute particles are arranged in a non-uniformity and they form a different phase from the solvent.

There can be more than one solute in a solution provided that the solute can be of miscibility with each other.

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Hello!

\(\large\boxed{5.33*10^{4} moles}\)

Begin by converting \(3.21 * 10^{28}\) molecules to moles using Avogadro's number:

\(3.21*10^{28} moles* \frac{1 mol}{6.02*10^{23} moles} = \frac{3.21*10^{28} }{6.02*10x^{23} }moles\)

Simplify:

\(\frac{3.21*10^{28} }{6.02*10x^{23} }=0.53*10^{5} = 5.33*10^{4}\)

Therefore, there are \(5.33*10^{4}\) moles in \(3.21*10^{28}\) molecules of \(N_{2}\).