nickel has a face-centered cubic (fcc) structure and has a density of 8.90 g/cm3. what is its atomic radius?

Answer:

6250

Explanation:

so m=500 and v=5

so v²=25

using the equation we can do 1/2 x 500 x 25 = 6250

Answer:

-943J or 943J released

Explanation:

m=2.4 mol x 207.g/ mol=497.3g

c=.129 J/gC

T= T f-Ti=(22.5-37.2)=-14.7C

Q=?

Q=(49.3g)(.129 J/g C) (-14.7 C)

= -943 J or 943 J released

Taking into account the reaction stoichiometry, the correct answer is option d): the theoretical yield of the reaction of aluminum oxide is 28.3 grams.

In first place, the balanced reaction is:

4 Al + 3 O₂ →2 Al₂O₃

By reaction stoichiometry, the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The theoretical yield is the maximum amount of product that could be formed from the given amounts of reagents.

Considering the limiting reagent, the following rule of three can be applied: if by reaction stoichiometry 108 grams of Al form 204 grams of Al₂O₃, 15 grams of Al form how much mass of Al₂O₃?

mass of Al₂O₃= (15 grams of Al×204 grams of Al₂O₃)÷ 108 grams of Al

mass of Al₂O₃= 28.3 grams

Finally, a mass of 28.33 grams of Al₂O₃ can be produced.

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The plastic disc had an acceleration of 340 m/s² when it was thrown.

To determine the acceleration of the plastic disc, we can use Newton's second law of motion, which states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. The formula is given as:

F = ma

Where:

F = Force (in Newtons)

m = Mass of the object (in kilograms)

a = Acceleration (in meters per second squared)

In this case, the force applied by the child throwing the disc is 68N, and the mass of the disc is 0.2kg. We need to solve for the acceleration.

Plugging the given values into the formula, we have:

68N = (0.2kg) * a

To isolate the acceleration (a), we divide both sides of the equation by 0.2kg:

a = 68N / 0.2kg

a = 340 m/s^2

Therefore, the plastic disc had an acceleration of 340 m/s^2 when it was thrown.

Acceleration is a measure of how quickly an object's velocity changes. In this case, the force applied by the child caused the disc to accelerate at a rate of 340 m/s^2. This means that for every second the disc was in motion, its velocity increased by 340 meters per second.

It's important to note that the acceleration only describes the initial motion of the disc when it was thrown. As the disc travels through the air, it may experience additional forces such as air resistance, which can affect its acceleration and overall motion.

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Final concentrations of acsch and tacrine in that reaction is 600x10⁻¹²mm.

The symptoms for mild to moderate Hypertension are managed by tacrine. Alzheimer's disease cannot be cured or prevented from worsening with tacrine. However, some Alzheimer's sufferers may benefit from tacrine since it helps them think more clearly.

The behavior, procedure, or event of responding. B: opposition or resistance to a power, influence, or movement, particularly: a propensity for an old-fashioned and typically obsolete social or political order or policy.

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pCO2 is an important factor that affects various aspects of water chemistry and the impacts of ocean acidification. When pCO2 increases, the concentration of total CO2 dissolved in water also increases. This leads to changes in pH, which decreases due to increasing atmospheric CO2 concentration.

When pCO2 rises, the concentration of only CO2 dissolved in water increases. The dissolved CO2 forms carbonic acid, which contributes to the acidification of the ocean. This increase in CO2 affects the equilibrium between CO2, HCO3-, and CO3^2-, shifting it towards higher levels of dissolved CO2 and H+ ions, resulting in a lower pH.

In terms of the impacts of ocean acidification on different organisms, the effects can vary depending on their specific needs. An organism that requires CO2 is likely to fare better under ocean acidification since the increase in dissolved CO2 can provide them with a favorable environment. However, organisms that rely on HCO3- or CO3^2- may fare worse under ocean acidification, as the lower pH interferes with the availability of these carbonate ions, which are essential for shell formation and calcification in some marine organisms.

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An anatomical feature that allows continuous recording of earthworm electrical activity is the electrical connections between fibers.

Earthworms are ideal for studying action potential conduction velocities in the classroom. This is because the simple linear anatomy makes it easy to measure axonal length, and the sparse coding of worms makes it easy to identify individual action potentials. Earthworms have two giant fiber systems (outer and inner) with different conduction velocities that can be easily measured by manipulating electrode placement and tactile stimulation. Here we present a portable and robust experimental setup that allows a student to measure line speed within her 30-minute to her 1-hour lab session. learns how to measure the conduction velocity of nerve action potentials using earthworm specimens and presents a basic electrophysiology laboratory setup to amplify and record nerve data using a simple amplifier and laptop to do.

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Hydrogen bonds form between neighboring water molecules because of the polarity of water molecules. Hydrogen bonds are formed between two: neighboring water molecules because of the polarity of water molecules.

A hydrogen bond is a form of dipole-dipole attraction that occurs between a hydrogen atom bonded to a highly electronegative atom and an unshared pair of electrons on a different electronegative atom. A hydrogen bond is a form of intermolecular force that is weaker than a covalent bond but stronger than the other dipole-dipole interactions.

In a water molecule, the oxygen atom has a higher electronegativity than the hydrogen atoms, resulting in a polar covalent bond. The oxygen atom of one water molecule has a partial negative charge, while the hydrogen atoms of another water molecule have a partial positive charge.

As a result, a hydrogen bond forms between them. The hydrogen bond between neighboring water molecules is critical for the properties of water. It is responsible for the high surface tension and heat capacity of water.

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Answer:

Explanation:

2C₂H₂ + 5O₂ = 4CO₂ +  2H₂O .

CO₂ formed in moles = 33.4 / 44 = .76 moles

4 moles of CO₂ is formed by 2 moles of C₂H₂

.76 moles of CO₂ is formed by .38 moles of C₂H₂

.38 moles of C₂H₂ were present initially

2 moles of C₂H₂  produces 2 moles of water

.38 moles of C₂H₂  produces .38  moles of water

water produced = .38 moles

= .38 x 18 = 6.84 grams of water .

Answer:

Science begins with methodological rationalism whereas non-science is heavy with beliefs that may not even have an ethics of belief attached to them thus are not starting with methodological system of methods in thought, actions or conclusions by means of a sold relation to valid and reliable reason and/or evidence like science.

Explanation:

took the test

Procedure for testing the law of conservation of mass for a burning log :When a log burns, the law of conservation of mass must be tested.

The procedure is as follows:

Step 1: Obtain a log of known mass and record it as M1.

Step 2: Burn the log completely and collect the ash left behind.

Step 3: Record the mass of the ash as M2.

Step 4: Determine the mass of the combustion product released into the air by subtracting the mass of the ash from the original mass of the log. This would be M3 = M1 – M2.

Step 5: Use a balance to weigh the mass of the combustion products that were released into the air and record the mass as M4.

Step 6: Compare the calculated mass of the combustion products in Step 4 to the measured mass of the combustion products in Step 5. If the mass of the combustion products released into the air is equal to the calculated mass, then the law of conservation of mass has been upheld. If not, then it has been violated and the cause of the difference should be identified and examined.

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In solution 4 of part b, both the hydronium concentration and hydroxide concentration are 1 M due to the neutralization reaction between HCl and NaOH. The initial concentrations of H₃O⁺ and OH⁻ were 0.1 M, but they reacted to form water and resulted in equal final concentrations of 1 M for both ions.

To calculate the hydronium and hydroxide concentrations for solution 4 in part b, we need to first understand the equation for the reaction that occurred.

The equation given is: HCl + NaOH -> NaCl + H₂O

This tells us that one mole of HCl reacts with one mole of NaOH to produce one mole of NaCl and one mole of water.

Based on this equation, we know that the initial concentration of hydroxide ions (OH-) in solution 4 is equal to the initial concentration of sodium hydroxide (NaOH), which was given as 0.1 M.

Next, we need to determine the concentration of hydronium ions (H₃O⁺). Since HCl is a strong acid, it completely dissociates in water to produce H₃O⁺ and Cl⁻ ions. Therefore, we can assume that the initial concentration of H₃O⁺ is equal to the initial concentration of HCl, which was also given as 0.1 M.

Now, let's consider what happens when the HCl and NaOH are mixed together. They react to form NaCl and water, which means that the concentrations of H₃O⁺ and OH⁻ will change.

From the equation, we can see that the reaction consumes one mole of HCl and one mole of NaOH. This means that the final concentration of HCl and NaOH will both be zero.

To determine the final concentration of OH-, we need to use the fact that the reaction produces one mole of water for every mole of NaOH that reacts. Therefore, the final concentration of OH⁻ will be equal to the initial concentration of NaOH (0.1 M) divided by the volume of the solution.

If we assume that the volume of the solution is 100 mL (as stated in the question), then the final concentration of OH- will be:

[OH⁻] = 0.1 M / 0.1 L = 1 M

Finally, we can use the fact that the concentration of H₃O⁺ and OH⁻ must be equal in a neutral solution to determine the final concentration of H₃O⁺.

Since the final concentration of OH⁻ is 1 M, we know that the final concentration of H₃O⁺ must also be 1 M.

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Sublimations are generally performed under reduced pressure because Less heat needs to be supplied for the vapor pressure of the solid to equal that of the external pressure. The correct option is c.

Sublimation is the process by which a solid turns into a gas without passing through the liquid state. It is commonly used in the purification of substances and is performed under reduced pressure to facilitate the process. The reason for this is that at reduced pressure, the vapor pressure of the solid is closer to the external pressure, which makes it easier to vaporize the solid.

If sublimation were performed at atmospheric pressure, the solid would need to be heated to a much higher temperature to reach its vapor pressure, and this would often cause the solid to decompose or melt instead of sublime.

By reducing the pressure, less heat needs to be supplied for the vapor pressure of the solid to equal that of the external pressure, and the solid can sublime more easily. Therefore, the correct option is c.

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Answer:

Specific chemical sugar glucose

Explanation:

When we say “blood sugar,” we mean the specific chemical sugar glucose. Diabetes is all about glucose. There lots of sugars….table sugar is sucrose, malt sugar is maltose, milk sugar is lactose, and you’ve probably heard of fructose.

Blood sugar, or glucose, is the main sugar found in your blood. It comes from the food you eat, and is your body's main source of energy. Your blood carries glucose to all of your body's cells to use for energy.

Pls mark me brainiest and my name is Misty.

Answer:

0.04 M

Explanation:

From the question given above, the following data were obtained:

Initial volume of solution (V1) = 25 cm³

Initial Molarity of solution (M1) = 0.4 M

Final volume of solution (V2) = 250 cm³

Final Molarity of solution (M2) =?

We can obtain the final Molarity of the solution by using the dilution formula as illustrated below:

M1V1 = M2V2

0.4 × 25 = M2 × 250

10 = M2 × 250

Divide both side by 250

M2 = 10/250

M2 = 0.04 M

Therefore, the resulting molarity of the diluted solution is 0.04 M

Answer:

22.715 moles of oxygen are used

Explanation:

Given data:

Number of moles of ethane = 6.49 mol

Number of moles of O₂ required = ?

Solution:

Chemical equation:

2C₂H₆ + 7O₂       →     4CO₂ + 6H₂O

Now we will compare the moles of oxygen with ethane.

                    C₂H₆           :           O₂  

                       2              :             7

                     6.49           :           7/2×6.49 = 22.715 mol

Thus, 22.715 moles of oxygen are used.

The adjustment that would result in the gas's volume doubling, assuming the gas is maintained at constant pressure, is option B: raising the temperature from 300 K to 600 K.

A key idea in physics is pressure, which is measured as the amount of force per unit area acting perpendicular to a surface. The pascal (Pa), which is equal to 1 newton per square metre, is the unit of pressure in the SI system. P is for pressure. F is the force that is delivered perpendicular to the surface (normally), and. The amount of force acting perpendicular to a unit area is referred to as pressure. The formula for pressure in mathematics is P=F/A, where P stands for pressure, F for force, and A for the area under consideration. Time is saved. Work "expands to cover the time available for its completion," according to Parkinson's Law.

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Answer:

calcium chloride because that is the answer

Answer:

It's C

Protons repel the neutrons.

Explanation:

An atom is unstable (radioactive) if these forces are unbalanced; if the nucleus has an excess of internal energy. The instability of an atom's nucleus may result from an excess of either neutrons or protons.

Answer:

B. It's nucleus is unstable

Explanation:

A P E X

1. The Earth revolves around the Sun. Theory: This is a scientific theory, which is an explanation supported by a large body of evidence that explains how a natural phenomenon or phenomenon works.

A theory is an explanation or principle that is based on observations, experiments, and logical reasoning. It is an organized system of ideas, concepts, and principles intended to explain how something works or why something happens. Theories are used to explain and predict phenomena and can be used to develop hypotheses, which can then be tested to gain a better understanding of the natural or social world. Theories can be used to understand and explain a wide variety of phenomena in the natural and social sciences, including the behavior of particles, the functioning of the human body, and the social dynamics of large groups of people.

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Answer:-2.0

Explanation:

If an automobile slows from 26 m/s to 18 m/s in a period of 4.0 s, the average acceleration is 2.0

Acceleration can be defined as  the vector quantity  and has both magnitude and direction, it is a second derivative of position with respect to time  and it is the first derivative of velocity with respect to time.

The change in the velocity of an object called as acceleration and the Velocity is a vector quantity with both magnitude and direction.

Acceleration can be a change in the direction of an object. For example, while pressing the accelerator of car makes the car go faster.

Acceleration(a)= final velocity(v) –initial velocity(u) time(t)

The velocity at the beginning was ‘u′, and the increased to velocity, ‘v′,  after "t"  time .

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In the reaction, A+ 3B -- > 2C + D the reaction is first order with respect to reactant A and second order with respect to reactant B. If the concentration of A is doubled and the concentration of B is halved, the rate of the reaction would be zero order by a factor of 1/2

The reaction given in the question is -

2A  + 3 B ---->  2C + D

From , the above reaction the rate law is written as -

rate = k [ A ]²[ B ]³

where ,

k = rate constant

In the above equation the order is determined by the sum of the powers of the concentrations , i.e. 2 + 3 = 5 order , which never possible ,

Hence , in the question ,

The by changing the concentration of B , the rate does not change .

hence , the rate is independent of the concentration of B .

Therefore ,

The order with respect to B will be zero .

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A Weak base (B) has a pKb value of 5.64. pH can be calculated as follows: pKb + pOH = 14pOH = 14 - pKbpOH = 14 - 5.64pOH = 8.36pH = 14 - 8.36pH = 5.64The [BH+] and [B] are equal at pH 5.64.

The species of B that predominates at pH 6.27 can be determined by comparing the pH and pKb values of B with the Henderson-Hasselbalch equation: pH = pKb + log([BH+]/[B])6.27 = 5.64 + log([BH+]/[B])[BH+]/[B] = 1.96 [BH+]:[B] = 1.96:1Since [BH+] > [B] at pH 6.27, the predominant species is BH+.

Similarly, we can determine the predominant species of B at pH 10.87:pH = pKb + log([BH+]/[B])10.87 = 5.64 + log([BH+]/[B])[BH+]/[B] = 333.52[BH+]:[B] = 333.52:1Since [BH+] >> [B] at pH 10.87, the predominant species is BH+.So, the answers are:[BH+]=[B] at pH 5.64. The predominant species at pH 6.27 is BH+. The predominant species at pH 10.87 is BH+.

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The true statement of all organic compounds is that they all contain carbon.

Organic compounds are chemicals that contain carbon atoms that have covalent bonds with other non-metallic atoms, especially hydrogen, oxygen, nitrogen, and sulfur. Because of the special qualities of carbon atoms, carbon has a unique chemistry that enables it to make complex and diverse structures.

Therefore the following statement is true of all organic compounds: All of them have carbon in them.

The statement that "all contain nitrogen" is false since there are many organic compounds that do not contain nitrogen. Also, the statement that "all are carbohydrates" is false since carbohydrates are just one category of organic compounds that make up the broader family of organic compounds. Lastly, the statement that "all are hydrophobic" is also false because there are many organic compounds that are hydrophilic and soluble in water.

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Answer:

5.12 atm

Explanation:

Before you can use the Ideal Gas Law to find the pressure, you need to convert grams to moles (via molar mass).

Molar Mass (H₂): 2(1.008 g/mol)

Molar Mass (H₂): 2.016 g/mol

 1.8 grams H₂               1 mole
----------------------  x  ----------------------  =  0.893 moles H₂
                                 2.016 grams

The Ideal Gas Law equation looks like this:

PV = nRT

In this equation,

-----> P = pressure (atm)

-----> V = volume (L)

-----> n = moles

-----> R = Ideal Gas Constant (0.0821 L*atm/mol*K)

-----> T = temperature (K)

After converting Celsius to Kelvin, you can plug the given values into the equation and simplify to find the pressure.

P = ? atm                                R = 0.0821 L*atm/mol*K

V = 4.3 L                                T = 27 °C + 273.15 = 300.15 K

n = 0.893 moles

PV = nRT

P(4.3 L) = (0.893 moles)(0.0821 L*atm/mol*K)(300.15 K)

P(4.3 L) = 22.0021

P = 5.12 atm

**Based on my past experiences, I believe the constant (R) you provided may have been mistyped. Instead of 0.821, I used 0.0821.**

The no of moles of carbondioxide that can be produced from 3.2 moles of glucose is 6.4 moles.

Stoichiometry is the study and calculation of quantitative (measurable) relationships of the reactants and products in chemical reactions (chemical equations).

According to this question, glucose decomposes into ethanol and carbondioxide. Based on the equation as in the image, 1 mole of glucose produces 2 moles of carbondioxide.

This means that 3.2 moles of glucose will produce 3.2 × 2 = 6.4 moles of carbondioxide.

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The number of moles of the CO2 that is going to be produced in the reaction is 6.4 moles.

Stoichiometry is a branch of chemistry that deals with the quantitative relationship between reactants and products in chemical reactions.

We have to note that we have to apply the stoichiometry of the reaction so that we can be able to solve the problem that we have in the case that we are dealing with here.

We know that;

1 mole of glucose produces 2 moles of CO2

3.20 moles of glucose  will produce 3.2 * 2/1

= 6.4 moles of CO2

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The comparison of the Mileage (miles per gallon) of different vehicles, such as a car vs a truck or a car vs. SUV or perhaps a SUV vs. truck is shown.

Slide 1: Introduction

Title: Mileage Comparison of Different Vehicles

Subtitle: Energy Used and Released

Content:

This presentation compares the energy used and released for mileage of different types of vehicles.

The vehicles include a car, a truck, and an SUV.

The comparison is based on their fuel efficiency, which is measured in miles per gallon (MPG).

We will analyze the amount of energy used and released by each vehicle to understand their impact on the environment.

Slide 2: Fuel Efficiency of a Car

Title: Fuel Efficiency of a Car

Subtitle: Miles per Gallon (MPG)

Content:

A typical car has a fuel efficiency of around 25-30 MPG.

This means that for every gallon of gasoline, the car can travel up to 30 miles.

The amount of energy released by a car is directly proportional to the amount of fuel consumed.

A car that travels 30 miles using one gallon of gasoline releases less energy compared to a car that travels 25 miles using one gallon of gasoline.

Slide 3: Fuel Efficiency of a Truck

Title: Fuel Efficiency of a Truck

Subtitle: Miles per Gallon (MPG)

Content:

A typical truck has a fuel efficiency of around 15-20 MPG.

This means that for every gallon of gasoline, the truck can travel up to 20 miles.

The amount of energy released by a truck is more compared to a car due to its heavier weight and larger engine.

A truck that travels 20 miles using one gallon of gasoline releases more energy compared to a car that travels 30 miles using one gallon of gasoline.

Slide 4: Fuel Efficiency of an SUV

Title: Fuel Efficiency of an SUV

Subtitle: Miles per Gallon (MPG)

Content:

A typical SUV has a fuel efficiency of around 20-25 MPG.

This means that for every gallon of gasoline, the SUV can travel up to 25 miles.

The amount of energy released by an SUV is also more compared to a car due to its larger size and weight.

An SUV that travels 25 miles using one gallon of gasoline releases more energy compared to a car that travels 30 miles using one gallon of gasoline.

Slide 5: Environmental Impact

Title: Environmental Impact

Subtitle: Energy Used and Released

Content:

The energy used and released by a vehicle has a direct impact on the environment.

The more energy released, the more greenhouse gases are emitted into the atmosphere.

Greenhouse gases contribute to global warming and climate change.

Vehicles with lower fuel efficiency have a higher environmental impact compared to those with higher fuel efficiency.

Therefore, it is important to choose a vehicle with good fuel efficiency to reduce our carbon footprint and help protect the environment.

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Experiment 2 will have a faster initial rate of formation of CO2 compared to Experiment 1.

Looking at the experimental conditions, we can see that Experiment 2 has a higher concentration of the solid CaCO3 and a higher temperature compared to Experiment 1. Both of these factors will increase the rate of the reaction according to the collision theory. A higher concentration of CaCO3 will result in more collisions between the reactant particles, while a higher temperature will increase the kinetic energy of the particles, making them move faster and collide more frequently. Therefore, Experiment 2 will have a faster initial rate of formation of CO2 than Experiment 1. The fact that both experiments use finely powdered samples of the solid and 50.0 ml of HCl(aq) is irrelevant to the comparison of their initial rates, as these factors do not vary between the experiments.

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