It takes 208. 4 kj of energy to remove 1 mole of electrons from an atom on the surface of rubidium metal. How much energy does it take to remove a single electron from an atom on the surface of solid rubidium?.

The number of moles of nitrate dissolved in water if 6.15 mole of strontium nitrate is :   12.3 moles

Given data :

Moles of strontium nitrate = 6.15 moles

When strontium nitrate ( \(Sr(NO_{3} )_{2}\) ) is placed in water it will dissociates into its ions because strontium nitrate is an ionic compound.

Next step : Represent the ionization of strontium nitrate

\(Sr ( NO_{3} )_{2} (aq) --- > Sr^{2+} (aq) + 2NO_{3} ^{-} (aq)\)

From the Stoichiometry of the chemical reaction

I mole of strontium nitrate =  2 moles of Nitrate ions

6.15 mole of strontium nitrate = 2 * 6.15

                                                 = 12.3 moles of Nitrate

Hence we can conclude that The number of moles of nitrate dissolved in water if 6.15 mole of strontium nitrate is :   12.3 moles.

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The experiment that is reference above is Copper Wire in a Solution of Silver Nitrate. The color of the solution changes to from clear to blue because Copper is oxidizing and forming copper(II) ions, which have a blue color in solution.

Oxidation is a process that happens when certain materials interact with oxygen or other substances.

It can make things change color, rust, or even burn. It's like when an apple turns brown when exposed to air. Oxidation can happen slowly over time or quickly in a chemical reaction.

Because oxidation and reduction always occur together in a redox reaction, with one species losing electrons and another acquiring those electrons, the overall balance of electrons and charge in the reaction is maintained.

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Full Question:

Although part of your question is missing, you might be referring to this full question:

The experiment is called "Copper Wire in a Solution of Silver Nitrate.

13. What caused the color that you observed in the 150-mL beaker as the experiment proceeded?

Answer:

2Al(NO3)3+3K2CO3->Al2(CO3)3+6KNO3

So the right answer is 2,3,1,6

Explanation:

First you look at the equation that isn't balance, you can see Al(NO3)3 while Al2(CO3)3, so you put 2 in Al(NO3)3.

Now we have 2Al is correct, but 6NO3. So we have 6KNO3, it also means we have 6K

Finally, we only have 2K as K2CO3 so we put 3 in it, so we have 3K2CO3.

Sorry about my explanation, it's hard to understand but the answer is correct.

Answer.

Hydrocarbons are compounds that contain carbon and hydrogen only

Explanation:

a. c3H4 methane

b.c3H4.propene

c.c5H8

Answer:

In this theory, people solve problems by searching in a problem space

Explanation:

I hope this helps

Answer:

i do not know

Explanation:

i am not smart

sowwy :l

The cultures of prehistoric humans are primarily known through the excavation of stone tools and other durable artifacts, such as the Oldowan and Acheulian tool traditions.

Stone tools and imperishable artifacts serve as key archaeological evidence for understanding prehistoric cultures. Through meticulous excavation and analysis, archaeologists have been able to piece together the lifestyles, technological advancements, and social behaviors of early human societies. The term "paleolithic" refers to the Old Stone Age, a time when humans relied on stone tools as their primary implements.

The Oldowan tool tradition is considered the earliest stone tool industry, dating back around 2.6 million years ago. It is characterized by simple tools, such as choppers and scrapers, which were crafted by flaking off pieces from larger stones. These tools were primarily used for basic activities like butchering and processing animal carcasses.

Later, the Acheulian tool tradition emerged around 1.76 million years ago, representing an advancement in stone tool technology. Acheulian tools, such as handaxes and cleavers, were more refined and standardized, showcasing an increased level of sophistication in tool-making techniques. These tools served a wide range of purposes, including hunting, woodworking, and shaping raw materials.

By studying the Oldowan and Acheulian tool traditions, researchers gain valuable insights into the cognitive abilities, cultural development, and technological progress of early humans. The examination of these artifacts provides evidence of their adaptability, problem-solving skills, and the gradual refinement of their tool-making techniques over time.

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Answer:

Polar easterlies are dry, cold prevailing winds that blow from the east. They emanate from the polar highs, areas of high pressure around the North and South Poles. Polar easterlies flow to low-pressure areas in sub-polar regions. Westerlies. Westerlies are prevailing winds that blow from the west at midlatitudes.

Explanation:

I hope this helps

Answer: \(1.6\times 10^4\)

Explanation:

Scientific notation is defined as the representation of expressing the numbers that are too big or too small and are represented in the decimal form with one digit before the decimal point times 10 raise to the power.

For example : 5000 is written as \(5.0\times 10^3\)

In division , the result would contain the same number of significant digits as there in the least precise number , thus the answer would have 2 significant digits.

\(\frac{1.248\times 10^{-2}}{7.8\times 10^{-7}}=1.6\times 10^4\)

The boiling point of a substance is determined by the strength of intermolecular forces between its molecules. The stronger the intermolecular forces, the higher the boiling point. The correct answer is: I₂.

Out of the given options, the molecule with the highest boiling point would be the one with the strongest intermolecular forces. Since the strength of intermolecular forces increases with the size of the molecule, we can predict that I2 would have the highest boiling point among F₂, Cl₂, Br₂, and I₂.

As non-polar molecules, the halogens  F₂, Cl₂, Br₂, and I₂ are subject to London dispersion forces as their primary intermolecular forces. Larger molecules often have stronger London dispersion forces and higher boiling temperatures because these forces are a form of van der Waals force that increase with molecule size.

I₂ has a larger size than the other halogens, which results in stronger London dispersion forces and a higher boiling point than the others. F₂, on the other hand, has the lowest boiling point among the halogens because to its smallest size and thus weakest London dispersion forces.

Therefore, these halogens' boiling points would be in this order:

F₂  ∠ Cl₂  ∠ Br₂  ∠ I₂

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Answer:

true

Explanation:

Because Mercury can be solidified when its temparature us brought to its freezing point. However, when returned to room temparature conditions, mercury does not exist in solid state for long, and returns back to its more common liquid form.

At a chemical level, alcohol addiction results in chemical changes that A. cause the body to crave alcohol.

Alcohol addiction can cause the body to crave alcohol. Chronic alcohol use can lead to changes in the brain's reward and pleasure pathways, affecting neurotransmitters and signaling systems involved in reward and reinforcement. These changes can result in cravings for alcohol, as the brain associates alcohol consumption with pleasurable effects.

Alcohol addiction involves complex interactions and changes within the brain and body, and the specific mechanisms and effects can vary among individuals.

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Answer:

Water is a remarkable substance, and its unique properties are largely due to the presence of polar covalent bonds and hydrogen bonds in its structure. These characteristics play a crucial role in the physical and chemical properties of water, making it essential for life as we know it.

Explanation:

The polar covalent bonds in water arise from the unequal sharing of electrons between oxygen and hydrogen atoms. This results in the oxygen atom having a partial negative charge (δ-) and the hydrogen atoms having partial positive charges (δ+). These charges create polarity within the water molecule, leading to the formation of hydrogen bonds.

Hydrogen bonds occur when the partially positive hydrogen atom of one water molecule is attracted to the partially negative oxygen atom of another water molecule. These hydrogen bonds are relatively weak individually, but when present in large numbers, they contribute to the cohesion, surface tension, and high boiling point of water.

The importance of these bonds is manifold. The cohesion between water molecules due to hydrogen bonding enables water to form droplets, have a high surface tension, and flow freely, facilitating transport within organisms and in the environment. Additionally, hydrogen bonding leads to the high specific heat capacity and heat of vaporization of water, making it an effective regulator of temperature in living organisms and ensuring stable environmental conditions.

Furthermore, hydrogen bonds play a crucial role in the unique properties of water as a solvent. The polar nature of water allows it to dissolve a wide range of substances, including ionic compounds and polar molecules, facilitating various biological processes such as nutrient transport and chemical reactions in cells.

Answer:Its c

Explanation:

Let us use a double displacement reaction of Lead (II) Nitrate and Potassium Chromate to produce Lead (II) Chromate and Potassium Nitrate to practice balancing an equation.

We begin with the base equation provided in the question.Pb(NO3)2(aq)+K2CrO4(aq)→PbCrO4(s)+KNO3(aq)

Looking at the the atom inventory ReactantsPb=1NO3=2

K=2CrO4=1

Products

Pb=1

NO3=1

K=1

CrO4=1

We can see that the

Kand NO3

are imbalanced.

If we add a coefficient of 2 in front of the

KNO3

this will balance the equation.

Pb(NO3)2(aq)+K2CrO4(aq)→PbCrO4(s)+2KNO3(aq)

Answer:

Temperature will revert to room temperature after the substance reacts fully. Heat energy flows between the chemical bonds of the added substance and water to the surroundings (elsewhere in the water, the beaker, a student's hand that touches the beaker).

Explanation:

Hot packs and cold packs eventually return to room temperature because of thermal equilibrium

Temperature is the degree of hotness or coldness of a body. We have to note that bodies often tend to attain thermal equilibrium with the surroundings. Hence heat flows from or to the body as required.

Hence, the need to attain thermal equilibrium with the  environment is the reason why hot packs and cold packs eventually return to room temperature.

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The student's error of heating the beaker directly with a flame causing the solution to boil and spatter could lead to an error in the determination of the ammonium ion in the unknown.

When the ammonium ion, NH₄⁺, is heated, it undergoes thermal decomposition to form ammonia gas, NH₃, and water vapor. This reaction is exothermic, meaning it releases heat.

Therefore, when the student heated the beaker directly with a flame, it led to the decomposition of the ammonium ion, causing the formation of ammonia gas and water vapor. The spattering of the solution could result in a loss of ammonium ions or an incomplete reaction of the ammonium ions.

As a result, the amount of ammonium ions detected would be less than the actual amount present in the solution. This would lead to an error in the determination of the concentration of the ammonium ion in the unknown. It is essential to follow proper testing procedures to avoid errors and obtain accurate results.

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Answer:

Amoeba since it can come together as a multicellular with other amoebas, but still act as one giant living cell.

Explanation: i read in a book that red-slime molds can do that. hope it wasn't too far too late recent.

Answer:

False

Explanation:

Let's break down the equation PV=nRT.

P=Pressure

V= Volume

n= number of mole

R= the universal constant

T= Temperature

The = sign is the barrier between them. Whenever one side of the equation increases, something on the other side is directly impacted. When Temperature increases, so will pressure--and vise versa.

When ranking the chemicals according to their influence on egg shell thickness, from least to greatest, the order would be mercury, dieldrin, DDE, DDT, and PCBs.

Mercury is ranked as the least influential because it is not directly linked to thinning of egg shells. While mercury exposure can cause various health issues, it does not have a significant impact on egg shell thickness.

Dieldrin is ranked next because it has been found to cause thinning of egg shells in certain bird species. It is an organochlorine pesticide that can bioaccumulate in the environment and disrupt calcium metabolism, leading to decreased egg shell thickness.

DDE (dichlorodiphenyldichloroethylene) is a breakdown product of the pesticide DDT. DDE is known to accumulate in the bodies of birds and cause thinning of egg shells by inhibiting the production of calcium carbonate.

DDT (dichlorodiphenyltrichloroethane) itself is more influential than DDE as it directly affects egg shell thickness. DDT and its metabolites interfere with the hormone balance in birds, resulting in reduced calcium availability for shell formation.

PCBs (polychlorinated biphenyls) are the most influential chemicals on egg shell thickness. They are persistent organic pollutants that have been linked to thinning of egg shells in various bird species. PCBs can disrupt hormone systems and calcium metabolism, leading to weakened egg shells.

Overall, the ranking is based on the known effects of these chemicals on egg shell thickness, with mercury having the least influence and PCBs having the greatest influence.

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The complete question is:

Rank the chemicals according to how much they influence egg shell thickness. Least influence on egg shell thickness Greatest influence on egg shell thickness DDE, DDT, PCBs, dieldrin, and mercury.

When \(CO_{2}\) and \(H_{2} CO_{3}\) are both horizontal lines, the rate of the forward reaction is the same as the rate of the reverse reaction. The reaction is occurring at equilibrium, with no net change in the concentrations of reactants and products over time.

When the concentration of carbon dioxide \(CO_{2}\) and the concentration of carbonic acid \(H_{2} CO_{3}\) are both horizontal lines, it indicates that their concentrations remain constant over time. In such a scenario, the rate of the forward reaction is the same as the rate of the reverse reaction. A horizontal line on a concentration-time graph suggests that the concentrations of the reactants and products are not changing, implying that the reaction has reached equilibrium. At equilibrium, the rate of the forward reaction equals the rate of the reverse reaction. This is a fundamental principle of chemical equilibrium, described by the principle of microscopic reversibility.

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Answer: N2(g) + 3H2(g)- >2NH3(g) denotes a negative entropy change.

Explanation:

Entropy is defined as the extent of disorder in a system. The degree of entropy is more in a gas and less in a solid.

Here, 1st reaction produces ammonia from nitrogen and hydrogen. We can see that four moles of gases produces 2 moles of gaseous product. So the degree of disorder in the system is decreasing. So the entropy is also decreasing.

Answer:

c'eop wjau ciouwh

Explanation:

The complete mechanism for the conversion of p-hydroxybenzaldehyde to 3-iodo-4-hydroxybenzaldehyde is as follows.

1. Deprotonation of the phenol: The base NaOCl (sodium hypochlorite) abstracts the hydrogen from the hydroxyl group on the p-hydroxybenzaldehyde, forming a phenoxide ion.

p-Hydroxybenzaldehyde + NaOCl → Phenoxide ion + NaCl + H2O

2. Formation of I-Cl: In a separate reaction, I2 (iodine) reacts with NaOCl (sodium hypochlorite) to form I-Cl (iodine monochloride) and NaI (sodium iodide).

I2 + NaOCl → I-Cl + NaI

3. Activation of the aromatic ring: The I-Cl (iodine monochloride) acts as an electrophile and reacts with the phenoxide ion, which acts as a nucleophile. This results in the substitution of the hydrogen atom at the ortho position of the phenoxide ion with the iodine atom.

Phenoxide ion + I-Cl → 3-Iodo-4-hydroxybenzoate ion + Cl^-

4. Protonation of the phenoxide ion: The 3-iodo-4-hydroxybenzoate ion is protonated, converting it back to the phenol form, resulting in the final product, 3-iodo-4-hydroxybenzaldehyde.

3-Iodo-4-hydroxybenzoate ion + H2O → 3-Iodo-4-hydroxybenzaldehyde + OH^-

So, the overall mechanism involves deprotonation of the phenol, formation of I-Cl, activation of the aromatic ring as a nucleophile, and finally the protonation of the phenoxide ion to give the desired product, 3-iodo-4-hydroxybenzaldehyde.

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Answer:

it will move

Explanation:

Answer:

A burning match represents an exothermic reaction. The chemicals release energy in the form of heat and light as the reaction progresses.

Explanation:

Sample Response

The ionic species, when added to pure water, would result in a change in pH is A. I and II

The addition of ionic species to pure water can result in a change in pH due to their ability to either donate or accept protons. In this case, the ionic species that can cause a change in pH are those that contain a weak acid or a weak base. Option I, KHCOO, is a weak acid salt and can undergo hydrolysis in water, resulting in the formation of H+ ions and therefore a decrease in pH. Option II, NaF, is a salt of a weak base and a strong acid. It will not have a significant effect on the pH of pure water.

Option III, Ba(NO³)², is a salt of a strong acid and a strong base, and it will also not have a significant effect on the pH of pure water. Option IV, CH³NH³Br, is a salt of a weak base and a strong acid and can undergo hydrolysis in water, resulting in the formation of OH⁻ ions and therefore an increase in pH. Therefore, the correct answer is A. I and II, as only KHCOO and CH³NH³Br can cause a change in pH when added to pure water.

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Answer:

c. H2 andO2

I think this is the answer not sure ok

Answer:

I have no Idea please give more context to your question.

Explanation: