When you make ice cubes, the entropy of the water
decreases while the water is cooling but does not change as it turns to ice. X decreases. increases. is unchanged as the water cools but decreases as the water freezes. remains unchanged.

Answer:

1.2 x 10⁵ moles Ag (2 sig. figs.)

Explanation:

1 mole any substance (elements or compounds) => 6.023 x 10²³ particles of specified substance

∴ 6.9 x 10²⁸ atoms Ag = 6.9 x 10²⁸ Ag atoms / 6.023 x 10²³ Ag atoms/mole Ag

                                    = 1.145608501 x 10⁵ moles Ag (calculator answer)

                                    = 1.2 x 10⁵ moles Ag (2 sig. figs.)

Answer:

\(\boxed {\boxed {\sf 110,000 \ mol \ Ag}}\)

Explanation:

We are asked to convert 6.9*10²⁸ silver atoms to moles of silver. We can do this in 2 steps.

We know that 1 mole of any substance contains the same number of particles: 6.022*10²³ (Avogadro's Number). These particles can be atoms, molecules, formula units, and more. In this case, the particles are atoms of silver (Ag).

So, there are 6.022 *10²³ atoms of silver in 1 mole. Let's set up a ratio using this information.

\(\frac{6.022*10^{23} \ atoms \ Ag}{ 1 \ mol \ Ag}\)

Since we are converting 6.9*10²⁸ silver atoms to moles of silver, we multiply by that value.

\(6.9*10^{28} \ atoms \ Ag*\frac{6.022*10^{23} \ atoms \ Ag}{ 1 \ mol \ Ag}\)

Flip the ratio. It remains equivalent, but the units if atoms of silver can cancel.

\(6.9*10^{28} \ atoms \ Ag*\frac{ 1 \ mol \ Ag}{6.022*10^{23} \ atoms \ Ag}\)

\(6.9*10^{28} *\frac{ 1 \ mol \ Ag}{6.022*10^{23}}\)

\(\frac{6.9*10^{28} }{6.022*10^{23}} \ mol \ Ag\)

\(114579.8738 \ mol \ Ag\)

The original measurement of silver atoms (6.9*10²⁸) has 2 significant figures, so our answer must have the same.

For the number we calculated, that is the ten thousands place. The 4 in the thousandths place (114579.8738) tells us to leave the 1.

\(110,000 \ mol \ Ag\)

There are approximately 110,00 moles of silver in 6.9*10²⁸ silver atoms.

The addition of sodium hydroxide and NaC₂H₃O₂ to water produces a buffer solution. Option a is correct.

A buffer solution is a solution that resists changes in pH when small amounts of an acid or a base are added to it. It contains a weak acid and its conjugate base (or a weak base and its conjugate acid) in approximately equal concentrations.

When sodium hydroxide (NaOH) is added to water, it dissociates completely to form hydroxide ions (OH⁻) and sodium ions (Na⁺):

NaOH → Na⁺ + OH⁻

When sodium acetate (NaC₂H₃O₂) is added to water, it also dissociates, but only partially, to form acetate ions (C₂H₃O₂⁻) and sodium ions (Na⁺):

NaC₂H₃O₂ → Na⁺ + C₂H₃O₂⁻

The acetate ion acts as a weak base and can react with the hydroxide ion to form water and acetate hydroxide:

C₂H₃O₂⁻ + OH⁻ → HC₂H₃O₂ + H₂O

The weak acid, HC₂H₃O₂, formed by this reaction, can react with additional hydroxide ion to reform acetate ion and water:

HC₂H₃O₂ + OH⁻ → C₂H₃O₂⁻ + H₂O

Thus, the solution contains both the weak acid (HC₂H₃O₂) and its conjugate base (C₂H₃O₂⁻), which together act as a buffer and help to resist changes in pH when small amounts of an acid or a base are added to the solution. Option a is correct.

To know more about buffer solution, here

brainly.com/question/24262133

#SPJ4

The change in free energy that takes place when 1 mole of material is created from its component components in their standard states is known as the standard free energy of formation (ΔG). The value of Kp for the reaction is 0.59.

The equilibrium constants for a perfect gaseous mixture are Kp and Kc. When equilibrium concentrations are stated in atmospheric pressure, the equilibrium constant is Kp, and when they are expressed in molarity, the equilibrium constant is Kc.

The expression connecting free energy of formation with Kp is:

ΔG = -RTlnKp

Here R is the gas constant and T is the temperature in Kelvin.

25°C = 298 K

1.3 × 10³ J/mol = - (8.314 J/mol.K)(298 K) lnKp

ln Kp = - .5247

Kp = 0.59

To know more about free energy, visit;

https://brainly.com/question/13795204

#SPJ12

The final concentration of \(Cu^{2+}\) in the solution is 1 × \(10^{-16} M\).

Given:

Concentration of \(Cu(NO_{3} )_{2}\) = 4.00 × \(10^{-4} M\)

rmen = 1.00 × \(10^{-3}M\)

Moles of \(Cu(NO_{3}) _{2}\) = 0.0004 mol

Moles of ethlenediamine = 0.001 mol

Kf for \(Cu(en)^{2+} _{2}\) = 1 ×\(10^{20}\)

From the fromula \(Cu(en)^{2+} _{2}\):

The mole ratio for \(Cu(NO_{3})_{2} : en = 2:1\)

so, moles of en = 0.0004 × 2 = 0.0008 moles

Now, remaining en moles = 0.001 - 0.0008 = 0.0002 moles

Now, using the formula \(Cu(en)^{2+} _{2}\):

0.0004 moles of \(Cu(NO_{3})_{2}\) reacted to form an equal 0.0004 moles of \(Cu(en)^{2+}_{2}\) as shown by equation below:

\(Cu^{2+} + 2en\) → \(Cu(en)^{2+} _{2}\)

1.0 ×\(10^{20}\) = \(\frac{0.0004}{(Cu^{2+) * (0.0002^{2+} )} }\)

Kf = \(\frac{Cu(en)^{2} _{2} }{(Cu^{2+}) (en^{2}) }\)

\(Cu^{2+} = \frac{0.0004}{(1.0 * 10^{20} * 4 * 10^{-7}) }\)

\(Cu^{2+} = 1 * 10^{-16} M\)

A chemical species' concentration in a solution, specifically the amount of a solute per unit volume of solution, is measured by its molar concentration. The number of moles per litre, denoted by the unit sign mol/L or mol/dm3 in SI units, is the most often used unit denoting molarity in chemistry.

Molarity is the sum of the solute's moles. litres of the solution. Since the volume of the solution will be measured in litres and the quantity of moles of solute is measured in mol. So, mol L – 1 is the unit of molarity.

Learn more about Molarity:

https://brainly.com/question/8732513

#SPJ4

The complete question is:

A 1. 00-L solution contains 4. 00*10-4 M Cu(NO3)2 and 1. 00×10-7 Methylenediamine (en). The Kf for Cu(en)22 is 1. 00 x 1020. What is the final concentration of Cu2+ in the solution?

Sodium chloride is produced and used in the production of polyester, paper, rubber, glass, chlorine, household bleach, soaps, detergents, and dyes.

Chemically speaking, salt is a combination of chloride and sodium. Actually, the element that is most harmful to your health is sodium. (Therefore, the chloride is what gives food its "salty" flavor.).

To replace salt and water that have been lost from your body as a result of specific conditions, sodium chloride 23.4% injection is employed (eg, hyponatremia or low salt syndrome). Additionally, it is added to IV fluids that contain carbohydrates and parenteral nutrition total (TPN).

To know more about sodium chloride visit:

https://brainly.com/question/9811771

#SPJ1

Answer:

A warm front

Explanation:

Answer: A warm front

Explanation:

Preservation Techniques

Adding large amounts of salt or sugar to foods creates a hypertonic environment for bacteria, causing plasmolysis.

Pickling, smoking, and drying foods have been used for centuries to preserve foods.

Osmotic pressure is never a sterilization technique.

The preservation techniques and their effects on bacteria can be elaborated as follows:

Adding large amounts of salt or sugar to foods creates a hypertonic environment for bacteria, causing plasmolysis. This means that the high concentration of solutes outside the bacterial cells causes water to flow out of the cells, leading to cell shrinkage and ultimately inhibiting bacterial growth.

Pickling, smoking, and drying foods have been used for centuries to preserve foods. These methods work by either removing moisture, adding preservatives, or changing the food's environment, all of which help to slow down or prevent the growth of bacteria and spoilage.

Osmotic pressure is never a technique used for food preservation and sterilization; rather, it's a concept related to the movement of water across a semipermeable membrane in response to differences in solute concentrations. However, the principle of osmotic pressure can help us understand how some preservation techniques, such as adding salt or sugar, work by creating a hypertonic environment that leads to plasmolysis in bacteria.

To learn more about Food Preservation visit:

https://brainly.com/question/20397037

#SPJ11

The mass of liquid oxygen needed to burn 134.8 g of B2H6 is 84.41 mL LOX.

Liquid oxygen is a form of oxygen in its liquid state. It is a colorless, odorless, and highly reactive substance that is composed of two oxygen atoms bonded together. It can be made by cooling oxygen gas in a cryogenic process to temperatures below -297°F (-183°C).

The combustion reaction of diborane requires 3 moles of oxygen for every 1 mole of diborane, so the mass of oxygen required to burn 134.8 g of B2H6 (1 mole) is:
3 moles of O₂ x (32.00 g/mol O₂) = 96.00 g of O₂
Since liquid oxygen (LOX) has a density of 1.141 g/mL, the mass of liquid oxygen needed to burn 134.8 g of B2H6 is:
96.00 g O₂ ÷ 1.141 g/mL = 84.41 mL LOX

To learn more about liquid oxygen
https://brainly.com/question/22180725
#SPJ1

To answer your question, I would need to see equation (1) and more information about the specific experiment or situation.  However, I can explain the term "precipitate" and give a general outline of how to calculate the concentration of a solute in equilibrium.

To answer your question, I would need to see equation (1) and more information about the specific experiment or situation. However, I can explain the term "precipitate" and give a general outline of how to calculate the concentration of a solute in equilibrium.
A precipitate is a solid that forms when two solutions are mixed together and a reaction occurs. This solid can "precipitate" out of the solution and settle at the bottom of the container. The remaining solution is called the "supernatant" and contains the solute that did not form a solid.
To calculate the concentration of a solute in equilibrium, you would first need to know the chemical reaction that occurred and the solubility of the solid formed. From there, you could use stoichiometry and the equilibrium constant to calculate the number of moles of the solute that remained in solution and the number that formed the solid precipitate. Dividing the number of moles in solution by the volume of the solution would give you the equilibrium concentration of the solute.
Overall, calculating the concentration of a solute in equilibrium can be a complex process that requires knowledge of chemistry and specific experimental conditions.

To know more about precipitate visit: https://brainly.com/question/31141813

#SPJ11

The process of a liquid becoming a gas is called boiling (or vapourization) and the process of a solid becoming a liquid is called melting.

Vaporization is the process of converting a liquid into a gas. It is also called evaporation. Since we know that the particles of a gas are moving faster than those of a liquid, an input of energy must be required for a liquid to become a gas.

Melting is a physical process that results in the phase transition of a substance from a solid to a liquid. During melting, the energy goes exclusively to changing the phase of a substance; it does not go into changing the temperature of a substance. Hence melting is an isothermal process because a substance stays at the same temperature.

Example 1: Industrially, salt is recovered from seawater by the process of vaporization. Wet clothes are dried up due to the process of vaporization. The process is used in many industrial processes for separating the components of a mixture.

Example 2: Ice to water - Ice melts back into the water when it is left out at temperatures above the freezing point of 32 degrees. Rocks to lava - Rocks in volcanoes can be heated until they are molten lava. Metal to molten liquid - Metals such as steel and bronze can be molten down.

To learn more about vaporization and melting visit,

https://brainly.com/question/17945501

The given stereoisomer of 2-bromo-3-chlorobutane has the configuration of 2R, 3S.

What is a stereoisomer? A stereoisomer refers to the isomer of a compound that has the same molecular formula and sequence of atoms as the original compound, but with a different spatial arrangement of atoms.The difference between stereoisomers and structural isomers is that while stereoisomers have the same chemical formula and atom arrangement, structural isomers have different chemical formulas and atom arrangements. For example, glucose and fructose have the same chemical formula (C6H12O6), but they differ in their atom arrangements and are therefore considered stereoisomers.

Types of stereoisomers: Enantiomers: Enantiomers are mirror images of each other and are non-superimposable, meaning they cannot be placed on top of one another. Stereoisomers that are not enantiomers are known as diastereomers. Diastereomers: These are stereoisomers that are not enantiomers but still have the same atom sequence and chemical formula as each other. Diastereomers have different physical and chemical properties that are not due to stereoisomerism. Examples of diastereomers include cis and trans isomers.

Configurations of 2-bromo-3-chlorobutane:According to the given question, the stereoisomer of 2-bromo-3-chlorobutane has the configuration of 2R, 3S.

For more questions on stereoisomer

https://brainly.com/question/24128816

#SPJ11

Answer:

Search Engine: A search engine is a kind of website through which users can search the content available on the Internet. For this purpose, users enter the desired keywords into the search field. Then the search engine looks through its index for relevant web pages and displays them in the form of a list. The Internet is a huge source of information & resources and to access the resource from the Internet there are some kinds of software, this software is known as a Search Engine.

Web Browser: The web browser is an example of application software that is developed to retrieve and view information from web pages or HTML files present on web servers. The first web browser was invented by Sir Tim Berners-Lee in 1990 and the very first graphical web browser was developed in 1993 and is named the Mosaic. After that, various web browsers were developed.

When one mole of the sulfur allotrope with eight sulfur atoms is burned to form sulfur trioxide, 12 moles of molecular oxygen are consumed. The correct answer is option (c) 12. The balanced chemical equation of the combustion of a sulfur ring containing eight sulfur atoms is: S₈ + 12O₂ → 8SO₃

This equation shows that one mole of the sulfur ring (S₈ ) reacts with 12 moles of molecular oxygen (O₂) to produce 8 moles of sulfur trioxide (SO₃).

The combustion of one mole of elemental sulfur in the form of a ring of eight sulfur atoms (S₈ ) to produce sulfur trioxide (SO₃) requires the consumption of molecular oxygen (O₂). To determine the number of moles of O₂ consumed, we need to first write the balanced chemical equation for this reaction: S₈ + 12O₂ → 8SO₃

Here, one mole of S₈  reacts with 12 moles of O₂ to produce 8 moles of SO3. In the given question, we have one mole of S₈. Therefore, to find the number of moles of O₂ consumed, we can use the stoichiometry from the balanced equation: 1-mole S₈  × (12 moles O2 / 1-mole S₈ ) = 12 moles O₂

So, when one mole of the sulfur allotrope with eight sulfur atoms is burned to form sulfur trioxide, 12 moles of molecular oxygen are consumed. The correct answer is option (c) 12.

To know more about allotrope refer here:

https://brainly.com/question/28294770#

#SPJ11

Answer:

We can start by finding the amount of iron used in the reaction:

Iron (Fe) is the limiting reagent since it is completely used up in the reaction.

Molar mass of Fe = 55.845 g/mol

Moles of Fe = mass / molar mass = 3.58 g / 55.845 g/mol = 0.064 moles

The balanced chemical equation for the reaction is:

4Fe + 3O2 → 2Fe2O3

From the equation, we can see that 4 moles of Fe react with 3 moles of O2 to produce 2 moles of Fe2O3.

Moles of Fe2O3 produced = mass / molar mass = 5.00 g / (2 x 159.69 g/mol) = 0.01567 moles

Since 4 moles of Fe reacts with 2 moles of Fe2O3, the theoretical yield of Fe2O3 from 0.064 moles of Fe is:

Theoretical yield of Fe2O3 = (0.064 mol Fe) x (2 mol Fe2O3 / 4 mol Fe) x (2 x 159.69 g/mol Fe2O3) = 12.746 g

The percentage purity of iron is:

Percentage purity = (actual yield / theoretical yield) x 100%

Percentage purity = (5.00 g / 12.746 g) x 100% = 39.26% (rounded to two decimal places)

Therefore, the iron wire is 39.26% pure.

16 cells are produced from a single parent cell after fourth division of cell.

During mitosis type of cell division, one parent cell is divided into two daughter cells. In this way, in the first division two cells are produced from single parent cell, in the second division four daughter cells are produced. In the third division, 8 cells are produced from 4 parent cells and in the fourth division 16 cells are formed from 8 cells.

So we can conclude that 16 cells are produced from a single parent cell after fourth division of cell.

Learn more about cell here: https://brainly.com/question/13123319

#SPJ1

Answer:

16

Explanation:

I'm doing the exact assignment we are in the same school

Answer:

Explanation b:

Answer:

Combustion

Explanation:

A combustion reaction is a type of chemical reaction in which a compound and an oxidant are reacted to produce heat and a new product. The general form of a combustion reaction can be represented by the reaction between a hydrocarbon and oxygen, which yields carbon dioxide and water: hydrocarbon + O2 → CO2 + H2O.

Answer:

I think he likes you or at least has some intrest in you

Explanation:

Guys aren't very direct when they like a girl so sometimes its hard to tell but usually a guy will playfully joke with you and be curious about your interests when he likes you

The change in kinetic energy is equal to the force of magnitude fa multiplied by the horizontal distance δx, which is equal to faδx.

Kinetic energy is the energy possessed by an object due to its motion. It is a form of energy that is transferred during an impact or collision. Kinetic energy is calculated by multiplying the mass of the object times the square of its velocity. The faster an object is moving, the greater its kinetic energy. Kinetic energy can be converted into other forms of energy, such as heat or sound.

This is because the force is acting in the direction of the displacement, so the work done by the force is equal to the force multiplied by the displacement in the direction of the force. As the mass m is constant, the change in kinetic energy is equal to faδx/m.

To know more about kinetic energy click-

https://brainly.com/question/25737117

#SPJ4

When discussing a job agency and its reliability, a conversation between friends may touch on several aspects of the agency's services. They might consider the agency's reputation within the industry, the quality of the jobs the agency offers, and the level of support they provide to job seekers.

The agency's reputation, screening process, communication, and track record, the conversation might also touch on other factors that can affect an agency's reliability. These may include the types of industries and job roles the agency specializes in, the geographic region it serves and the fees it charges for its services.

If the agency primarily focuses on entry-level jobs or temporary positions, it may not be the best fit for job seekers looking for long-term career growth. If the agency only operates in a specific region or industry, it may not be able to offer the same level of job opportunities as larger agencies with a broader reach.

To learn more about agency follow the link:

https://brainly.com/question/15129864

#SPJ4

Ten transition metals along with their respective atomic masses:

1. Scandium (Sc) - Atomic Mass: 44.9559 u

2. Titanium (Ti) - Atomic Mass: 47.867 u

3. Vanadium (V) - Atomic Mass: 50.9415 u

4. Chromium (Cr) - Atomic Mass: 51.9961 u

5. Manganese (Mn) - Atomic Mass: 54.9380 u

6. Iron (Fe) - Atomic Mass: 55.845 u

7. Cobalt (Co) - Atomic Mass: 58.9332 u

8. Nickel (Ni) - Atomic Mass: 58.6934 u

9. Copper (Cu) - Atomic Mass: 63.546 u

10. Zinc (Zn) - Atomic Mass: 65.38 u

Transition metals are elements found in the d-block of the periodic table. They exhibit characteristic properties such as the formation of colored compounds, variable oxidation states, and the ability to form complex ions.

These metals often have multiple stable oxidation states due to the availability of different energy levels within their d-orbitals. This property allows them to form a wide range of compounds and exhibit various chemical behaviors.

Transition metals also have high melting and boiling points, good thermal and electrical conductivity, and are often malleable and ductile.

Their atomic masses vary depending on the specific isotope of the element, which may have a different number of neutrons. The atomic mass represents the average mass of all naturally occurring isotopes of an element, taking into account their relative abundance.

These transition metals play vital roles in various industrial processes, including catalysis, electronics, alloys, and the production of pigments and dyes. Their unique properties and versatility make them important elements in many fields of science and technology.

Know more about transition metals here:
https://brainly.com/question/2879928

#SPJ8

Answer:

it would slowly die off and the kinda of animal will not be there because it cant live there because they cant adapt to stay alive

Hope This Helped

True , A catalyst is a substance that quickens a chemical reaction; therefore, in homogeneous catalysis, the catalyst and reactants are in the same phase. Most of the time, everything will exist as a gas or be contained within a single liquid phase.

The difference between heterogeneous and homogeneous catalysts is that the former are in the same phase as the latter are not.

A single phase is what is meant by the notion of a pure substance or homogenous mixture. There are two or more phases in a heterogeneous mixture. Water and oil do not mix uniformly when combined; instead, two distinct layers are created.

To know more about homogeneous catalysis visit :-

https://brainly.com/question/20215227

#SPJ4

Answer:

sweat

Explanation:

you get dehydrated in hot weather because your body will release sweat to try and keep you cool

Answer:

Well, the heat can sometimes be very subtle in how it affects the body. If you're out in the sun, it can take just 30 minutes or up to a few hours for the heat to cause dehydration, nausea or it could cause trouble concentrating. When it's hot and humid, your risk of dehydration and heat illness increases. That's because when the air is humid, sweat can't evaporate and cool you as quickly as it normally does, and this can lead to an increased body temperature and the need for more fluids.

I HOPE DAT THIS HELPS :)

Explanation:

Option 1 is correct compound. 2-bromopentanal and pentanal do not have alpha-hydrogens and therefore cannot undergo aldol addition reaction in aqueous sodium hydroxide.

Out of the given options, only 2-methyl pentanal and 3-chloropentanal can undergo aldol addition reaction in the presence of aqueous sodium hydroxide. This is because both of these compounds have alpha-hydrogens (hydrogens attached to the carbon adjacent to the carbonyl group), which are necessary for the aldol reaction to occur.

Aldol condensations play an important role in the creation of organic compounds because they provide a dependable way to create carbon-carbon bonds. For instance, the Robinson annulation reaction sequence results in aldol condensation, and the Wieland-Miescher ketone product is an essential component in a variety of chemical synthesis processes.

In the aldol reaction between 2-bromopentanal pentanal  and a 2-methyl pentanal, the mechanism for the aldol addition product and the aldol condensation product is described .

Learn more about aldol addition reaction here

https://brainly.com/question/29847503

#SPJ11

The complete question is

select the compound(s) can undergo an aldol addition reaction in the presence of aqueous sodium hydroxide? options: 1. ,2-bromopentanal pentanal option 2.  2-methyl pentanal option 3. 3-chloropentanal

Answer:

The framework

The metal skeletal portion of a partial denture to which the remaining units are attached is called the framework.

The framework is the foundation of a partial denture and is made of a metal alloy, such as cobalt-chromium or titanium, to provide strength and support to the artificial teeth. It is custom-fabricated based on an impression of the patient's mouth and is designed to fit snugly around the remaining teeth and gums.

The artificial teeth and acrylic resin are then attached to the framework to create a functional and aesthetic partial denture.

To know more about denture on below link :

https://brainly.com/question/26560091#

#SPJ11

A mutagen is a chemical or physical agent capable of inducing changes in DNA, leading to mutations.

Mutagens can alter the genetic material by causing changes in the DNA sequence, such as substitutions, deletions, insertions, or rearrangements. These changes can result in the formation of new alleles or the disruption of normal gene function.

Examples of mutagens include certain chemicals, such as certain pesticides, tobacco smoke, and certain chemotherapy drugs. Physical agents like ionizing radiation (e.g., X-rays, gamma rays) and ultraviolet (UV) radiation from the sun or tanning beds can also induce DNA mutations.

It is important to note that not all mutagens are harmful. Some mutations can be beneficial, leading to genetic variation and adaptation in populations, while others may have detrimental effects, such as contributing to the development of diseases like cancer.

To know more about mutagen refer here :    

https://brainly.com/question/13960165#

#SPJ11                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      

Answer:

Na

Explanation: