when 2.16g of h2 reacts with excess o2 by the following equation, 258kj of heat are released. what is the change of enthalpy associated with the reaction of 1.00mol of hydrogen gas?

Answer:

Mercury

Explanation:

It is also highly toxic

Answer:

Histogram

Explanation:

Kai asked 10 random students how long it took for them to get to school using different methods on two different days. Without knowing the specific methods the students used, it is difficult to provide an accurate estimate for how long it will take students to get to school on their next trip. However, I can provide a rough estimate based on the data Kai collected.

Assuming Kai collected data for common methods such as walking, biking, driving, or taking the bus, we can analyze the average time it took for each method on the two different days. Let's say on Day 1, the average time for walking was 15 minutes, biking was 10 minutes, driving was 20 minutes, and taking the bus was 30 minutes. On Day 2, the average time for walking was 20 minutes, biking was 15 minutes, driving was 25 minutes, and taking the bus was 35 minutes.

Based on this data, we can estimate that on the next trip, it will take students around 150 minutes (10 students x 15 minutes) to walk to school, 100 minutes (10 students x 10 minutes) to bike to school, 200 minutes (10 students x 20 minutes) to drive to school, and 300 minutes (10 students x 30 minutes) to take the bus to school. Of course, this is a very rough estimate and may not accurately reflect the time it will take each individual student on their next trip, as there are many variables that can affect travel time such as traffic, weather, and distance.

Based on Kai's research, he can estimate the time it takes for students to get to school using different methods. Since we don't have specific data from his study, here's a general guideline:

1. Walking: If most students take about 15-30 minutes to walk to school, the estimated time for their next trip would be around 15-30 minutes.
2. Biking: If biking takes students about 10-20 minutes, their next trip could be estimated within that range.
3. Public transportation: Assuming students take 20-40 minutes on public transport, the estimated time for their next trip would be within this range.
4. Driving: If driving takes students approximately 5-15 minutes, their next trip could be estimated within that time frame.

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.

Answer:

process of depositing a thin layer of any superior metal over an object of a cheaper metal, with the help of electric current

Explanation:

I hope this help have an great day and stay health

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:

I'm not to sure I'll ask one of my frens to help

The value of Kₐ for the weak acid is equal to \(10^{-pKₐ}\), which is \(10^{-2.75}\) or approximately \(1.78 * 10^{-3}\).

To find the value of Kₐ for the weak acid, we can use the pH of the solution and the Henderson-Hasselbalch equation, which relates the pH of a solution to the concentration of the acid and its conjugate base.

The Henderson-Hasselbalch equation is given by:

pH = pKₐ + log ([A⁻]/[HA])

Where:

pH is the measured pH of the solution

pKₐ is the negative logarithm of the acid dissociation constant Kₐ

[A⁻] is the concentration of the conjugate base

[HA] is the concentration of the weak acid

Given that the pH of the solution is 2.75 and the concentration of the weak acid is 0.145 M, we can rearrange the equation to solve for pKₐ:

pKₐ = pH - log ([A⁻]/[HA])

Since the weak acid is not mentioned specifically, we'll denote it as HA.

Now, we need to determine the concentration of the conjugate base [A⁻]. Since the acid is weak, we can assume that the dissociation of the acid is small, and therefore, the concentration of the conjugate base will be approximately equal to the concentration of the weak acid:

[A⁻] ≈ [HA] = 0.145 M

Substituting the values into the equation:

pKₐ = 2.75 - log (0.145/0.145)

The log of 1 is zero, so the term in the parentheses simplifies to 1:

pKₐ = 2.75 - log(1)

pKₐ = 2.75 - 0

pKₐ = 2.75

Therefore, the value of Kₐ for the weak acid is equal to \(10^{-pKₐ}\), which is \(10^{-2.75}\)or approximately\(1.78 * 10^{-3}\)

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Answer:

2117.02 litres

Explanation:

Using the ideal gas equation as follows;

PV = nRT

Where:

P = pressure of the gas (atm)

V = volume of the gas (L)

n = number of moles (mol)

R = gas law constant (Latm/molK)

T = temperature (K)

According to the information given in this question,

P = 0.12 atm

V = ?

n = 9.7moles

T = 46°C = 46 + 273 = 319K

R = 0.0821 Latm/molK

Using PV = nRT

0.12 × V = 9.7 × 0.0821 × 319

0.12V = 254.04

V = 254.04 ÷ 0.12

V = 2117.02 litres

Plants use sunlight and cellular respiration to transform carbon dioxide into the hydrocarbon molecule glucose, which is then ingested by the plants.

During photosynthesis, oxygen and glucose are created from water and carbon dioxide; the plant uses the glucose and produces oxygen as a waste product.

In the process of cellular respiration, oxygen & glucose are transformed into carbon dioxide and water. Carbon dioxide, water, & ATP, which would be converted into energy, are the process' byproducts.

The main purpose of photosynthetic is to transform chemical energy into solar energy, which is then stored for future use. This mechanism primarily provides energy to the planet's life systems.

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a) The mass produced is 6.5 * 10^ -20 g.

b) The amount of water produced is 2.1 moles.

c) The mass of oxygen produced is 7.84 * 10^ -21 g.

d) The moles of ammonia needed is 0.56 moles.

Let us recall that we can be able to use the principles of stoichiometry to be able to obtain the parameters that we need to solve in this question.

a) Given that;

1 mole of oxygen would contain 6.02 * 10^23 molecules

x moles of oxygen would contain 8.46 x 10^ 2 molecules

x = 1.41 * 10^ -21 moles

If 4 moles of ammonia produces 4 moles of nitrogen IV oxide. Hence the mass of the nitrogen IV oxide produced

= 1.41 * 10^ -21 moles * 46 g/mol

= 6.5 * 10^ -20 g

b) Number of moles of ammonia = 23.7 g/17 g/mol

= 1.39 moles

If 4 moles of ammonia produces 6 moles of water

1.39 moles of ammonia produces 1.39 * 6/4

=2.1 moles

c) 1 mole of water would contain 6.02 * 10^23 molecules

x moles of water would contain  1.26 x 10^ 2 molecules

x = 2.1 * 10^ -22 moles

If 7 moles of oxygen produces 6 moles of water

x moles of oxygen would produce 2.1 * 10^ -22 moles of water

x = 2.45 * 10^-22 moles

Mass of the oxygen = 2.45 * 10^-22 moles * 32 g/mol

= 7.84 * 10^ -21 g

d) If 1 mole of oxygen occupies 22.4 L

x moles of oxygen occupies 22.05 L

x = 0.98 moles

If 4 moles of ammonia reacts with 7 moles of oxygen

x moles of ammonia would reacts with  0.98 moles of oxygen

x = 4 * 0.98/7

= 0.56 moles

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Covalent radius refers to covalently bonded atoms while atomic radius refers to non-bonded atoms.

There are two terms that are easily confused for each other in chemistry, these are the covalent radius and atomic radius. Covalent radius refers to covalently bonded atoms while atomic radius refers to non-bonded atoms.

Hence, half the distance between the nuclei of two covalently bonded atoms is the covalent radius, whereas half the shortest distance between the nuclei of identical nonbonded atoms is the atomic radius.

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Propan-1-ol and ethanoate are esterified Ethanoic acid and propan-1-ol combine to generate an ester. Propan-1-ol and strong acid acid ethyl ester are two isomers that make up this ester.

Esterification is a chemical reaction that produces at least one ester molecule by reacting a lactic substances (RCOOH) with such an ethanol (ROH) to create an ether (RCOOR) and water.

Up to around 1 moldm3, redox reactions are linked to [H+] concentration. The third kinetic equation controls with a forward reaction rate at constant [H+] concentration. where kH is the constant of proportionality of ester hydrolysis and kE is a rate constant for esterification.

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The required mass of water vaporized is 15.5 grams, from a 250 gram sample of water at the boiling point had 35.0 kj

Given: Mass of water (m) = 250 gHeat added (q) = 35.0 kJHeat of vaporization (ΔHvap) = 40.6 kJ/mole

To find:Mass of water vaporized (x) Formula:q = ΔHvap × nx = (q / ΔHvap) × nMass = moles × molar mass

We know that molar mass of water (H2O) = 18 g/molMoles of water vaporized (n) = (35.0 kJ / 40.6 kJ/mol) = 0.861 mol

Therefore,Mass of water vaporized (x) = 0.861 mol × 18 g/mol= 15.5  

Detailed Solution: According to the given statement,250g of water was taken at its boiling point and 35.0 kJ of heat was added to it, we need to find how many grams of water were vaporized. To solve this question, first, we need to know the heat of vaporization for water, which is 40.6 kJ/mole. It means to vaporize 1 mole of water, 40.6 kJ of heat is required.

Mass of water (m) = 250 g Heat added (q) = 35.0 kJHeat of vaporization (ΔHvap) = 40.6 kJ/molen = q / ΔHvapn = (35.0 kJ / 40.6 kJ/mol) = 0.861 molMoles of water vaporized (n) = 0.861 mol

Therefore, Mass of water vaporized (x) = 0.861 mol × 18 g/mol= 15.5 g Hence, the required mass of water vaporized is 15.5 grams.

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Answer:

1.75m/s or 6.3km/hr

Explanation:

here,

acceleration (a) = 0.7m/s^2

mass (m) = 30g

time (t) = 2.5s

initial velocity (u) = 0m/s

final velocity (v) = ?

now,

v = u + at

or, v = 0 + 0.7 * 2.5

hence, Final velocity (v) = 1.75 m/s

if u want to convert to km/hr

then,

1.75 * 3.6 (we know that 1m/s = 3.6km/hr)

= 6.3km/hr

Answer:

i cant get the pdf im so sorry

Explanation:

Answer:

Yes if u need help?

Explanation:

The average speed of the food cart to the nearest tenth of a m/s is 0.3 meter per second.

Speed of any moving body will be calculated by using the below formula as:

Speed = Distance / Time

Given that, Distance travelled to the right side = 4.5m

Time to travel = 15 sec

On putting values on the above equation, we get

Speed = 4.5 / 15 = 0.3 m/s

Hence required speed is 0.3m/sec.

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Answer:

Protons are a type of subatomic particle with a positive charge

Neutrons are a type of subatomic particle with no charge (they're neutral).

Answer:

it has oxidized because it has has given out 2 ions

Answer:

Oxidised

Explanation:

Mg -------> Mg2+ +2electrons

In this case Mg loses two electrons and loss of electron is oxidation so Mg oxidised.

When compared to the initial nuclide, the alpha decay product: The answer is B. The atomic number of the product is two less than the atomic number of the original nuclide.

What is Alpha Decay?

A nuclear process known as "alpha decay" causes the parent nucleus to emit an alpha particle. The alpha particle is made up of two neutrons and two protons. There is a radioactive decay process known as "alpha decay" in which an atomic nucleus produces an alpha particle and radioactively decays into a separate atomic nucleus with a mass number reduced by four and an atomic number reduced by two.

Alpha decay reduces atomic mass by 4 and atomic number by 2.

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a) The sphere emits thermal radiation at a rate of 139.75 Watts.

b) The sphere absorbs thermal radiation at a rate of 37.66 Watts.

c) The sphere's net rate of energy exchange is 102.09 Watts.

To calculate the rates of thermal radiation emission and absorption, we can use the Stefan-Boltzmann law, which states that the rate of thermal radiation emitted or absorbed by an object is proportional to its surface area, temperature, and the Stefan-Boltzmann constant.

a) The rate of thermal radiation emitted by the sphere can be calculated using the formula:

Emitting Rate = emissivity * surface area * Stefan-Boltzmann constant * (\(temperature^4 - environment\ temperature^4\))

Plugging in the given values:

Emitting Rate = \(0.924 * (4\pi * (0.457)^2) * 5.67 \times 10^{-8} * ((32.2 + 273.15)^4 - (82.9 + 273.15)^4)\)

Emitting Rate ≈ 139.75 Watts

b) The rate of thermal radiation absorbed by the sphere can be calculated in a similar way but using the environment temperature as the object's temperature:

Absorbing Rate = emissivity * surface area * Stefan-Boltzmann constant * (\(environment\ temperature^4 - temperature^4\))

Plugging in the given values:

Absorbing Rate = \(0.924 * (4\pi * (0.457)^2) * 5.67 \times 10^{-8} * ((82.9 + 273.15)^4 - (32.2 + 273.15)^4)\)

Absorbing Rate ≈ 37.66 Watts

c) The net rate of energy exchange is the difference between the emitting rate and the absorbing rate:

Net Rate = Emitting Rate - Absorbing Rate

Net Rate = 139.75 Watts - 37.66 Watts

Net Rate ≈ 102.09 Watts

Therefore, the sphere emits thermal radiation at a rate of 139.75 Watts, absorbs thermal radiation at a rate of 37.66 Watts, and has a net rate of energy exchange of 102.09 Watts.

Note: The units for all the rates are Watts.

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Answer:

The enzyme's active site must be the mold shape of the substrate.

Explanation:

An enzyme and a substrate bind together in order to work. If the shapes of the 2 are different, they will not be able to bond together. If the shapes of the 2 fit glove-in-hand, then they will be able to bond together.

Answer:

An atom is a complex arrangement of negatively charged electrons arranged in defined shells about a positively charged nucleus. This nucleus contains most of the atom's mass and is composed of protons and neutrons (except for common hydrogen which has only one proton).

Answer:

Atoms consist of an extremely small, positively charged nucleus in which the protons and neutrons can be found, and is surrounded by a cloud of negatively charged electrons.

Answer:

Yes

Explanation:

Why melting and boiling point of water is high?

The reason for the high melting and boiling temperatures is the hydrogen bonding between water molecules that causes them to stick together and to resist being pulled apart which is what happens when ice melts and water boils to become a gas

Answer:

the temperature in the hydrogen bonding between water molecules that causes them to stick together which happens when ice melts and water boil to become a gas

The effects of exposure were more pronounced in fish that had been raised in a less stressful environment, suggesting that environmental conditions can influence the impact of exposure to antidepressants.

1. The class of drugs being investigated in this study is antidepressants. They enter our waterways through excretion by individuals taking the medication, and disposal of unused medication into toilets or sinks that are connected to wastewater treatment plants.

2. C-start is an evasive maneuver that young fish use when they perceive a predator. This is important for larval fish survival because it helps them to avoid being eaten by predators.

3. In this investigation, researchers are testing two hypotheses. The first is that exposure to low levels of antidepressants can affect larval fathead minnows' behavior, and the second is that the effects of exposure will be more pronounced in fish that have been raised in a less stressful environment.

4. The researchers found that exposure to antidepressants at levels found in waterways can have a significant impact on the behavior of larval fathead minnows. Specifically, they found that the fish exposed to antidepressants were less likely to respond to the presence of predators, which could increase their risk of being eaten.

They also found that the effects of exposure were more pronounced in fish that had been raised in a less stressful environment, suggesting that environmental conditions can influence the impact of exposure to antidepressants.

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The hydrolysis of one ATP molecule has ΔG = -30.5 kJ mol⁻¹. Therefore, the minimum number of ATP molecules required to drive the hydrolysis of acetyl phosphate, with ΔG = -42 kJ mol⁻¹, is 2 ATP molecules.

The phosphorylation of acetic acid involves the transfer of a phosphate group from ATP to acetic acid, forming acetyl phosphate and ADP. The reaction can be represented as follows:

The hydrolysis of acetyl phosphate involves the addition of a water molecule, which breaks the phosphoanhydride bond and releases the energy stored in the phosphate bond. The reaction can be represented as follows:

The ΔG value of the hydrolysis of acetyl phosphate is -42 kJ mol⁻¹. Since the phosphorylation of acetic acid requires one ATP molecule, the minimum number of ATP molecules required to drive the hydrolysis of acetyl phosphate is calculated as follows:

Since the hydrolysis of one ATP molecule has ΔG = -30.5 kJ mol⁻¹, the minimum number of ATP molecules required to drive the hydrolysis of acetyl phosphate is 2.

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The likely mechanism if the given aromatic molecule is subjected to these reaction conditions is an addition-elimination mechanism using electrophilic aromatic substitution.

Here, correct answer is A. An addition-elimination mechanism using electrophilic aromatic substitution.

Electrophilic aromatic substitution is a type of chemical reaction in which an electron-deficient species, such as a Lewis acid, replaces a hydrogen atom on an aromatic ring. During this process, an electron-rich species, such as a Lewis base, acts as a nucleophile and attacks the electrophile, resulting in an addition-elimination reaction.

This type of mechanism involves the formation of a new bond between the electrophile and the aromatic ring, followed by the removal of a proton from the aromatic ring. This process results in the formation of a new compound with the same aromatic ring structure but with a different substituent attached.

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Based on the given statements, Student 1 employs correct scientific reasoning.

Based on the given statements, Student 1 employs correct scientific reasoning by explaining a possible source of error in terms of the physical properties of the system. They suggest that if the spot was placed below the solvent level, the sample would be dissolved into the solvent pool before it could travel up the plate, leading to inaccurate results. This is a valid explanation based on the principles of chromatography and the physical behavior of the sample and solvent.

Student 2 also provides a valid explanation based on the principle of polarity, but they do not specify how this might lead to unequal movement of the sample on the TLC plate.

Student 3's statement, on the other hand, does not provide a clear explanation of how closing the developing chamber too quickly might affect the outcome of the lab, and it does not demonstrate a clear understanding of the scientific principles involved.

Therefore, based on the given statements, Student 1 employs correct scientific reasoning.

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Two benefits of using models to represent scientific processes are that they can simplify complex systems and make predictions about how the system will behave. One drawback is that models are inherently simplified and may not fully represent the complexity of the real system.

Models are used in scientific research to represent complex systems or phenomena, allowing scientists to make predictions, test hypotheses, and explore the behavior of the system under different conditions. Models can take many forms, including physical models, mathematical models, and computer simulations.

Examples of scientific models used in different fields of science include climate models used to predict future weather patterns, molecular models used to study chemical reactions and interactions, and ecological models used to understand the dynamics of ecosystems. Other examples include economic models used to study market behavior, anatomical models used to study the human body, and cosmological models used to study the structure of the universe.

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Answer:

solid, gas

Explanation:

gasses are very low density because there is a low mass in a large volume with lots of space between atoms, solids on the other hand are very densely packed and there is very little room between atoms