Would you expect mgo or magnesium to have the higher modulus of elasticity? briefly explain your answer.

According to the observations, work of scientist uses evidence while work of an engineer uses a practical approach.

Observations are defined as a set of statements or facts which are recorded while conducting an experiment.Observations are made through sensing changes in the variables of the experiment.

It is specifically defined as an act of knowing or recording the changes in the variables of the experiment.Recording observations holds importance as recording observations avoid the experiment to be repeated over and over again.

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The number of neutrons in an atom can be found by subtracting the atomic number (number of protons) from the mass number (number of protons plus neutrons).

The mass number is typically found in the atomic symbol, which is written as follows: A X

Where A is the mass number (number of protons plus neutrons) and X is the chemical symbol of the element. The atomic number is usually written as a subscript to the left of the chemical symbol, as follows: A X Z

Where Z is the atomic number.

To find number of neutrons, simply subtract atomic number from the mass number:

Number of neutrons=Mass number-Atomic number

For example, the element carbon has an atomic number 6 and its mass number will be 12. To find the number of neutrons in a carbon atom, we subtract the atomic number from the mass number:

Number of neutrons= 12-6 = 6

Therefore, a carbon atom has 6 neutrons.

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The partial pressure of benzene and toluene is 74.11 torr.

Generally, vapor pressure is defined as a measure of the tendency of a material to change into the gaseous or vapor state, and it basically increases with temperature. Basically the temperature at which the vapor pressure at the surface of a liquid becomes equal to the pressure exerted by the surroundings is known as the boiling point of the liquid.

Pa denotes the Vapor pressure of benzene = 103.4 torr

Pb denotes the Vapor pressure of toluene = 46.9 torr

Moles of benzene can be calculated by the formula,

Number of moles of benzene = Given mass of benzene / Molar mass of benzene = 45/78 = 0.57 moles

Number of moles of toluene = Given mass of toluene/ Molar mass of toluene = 55/92 = 0.59 moles

Mole fraction of benzene (Xa) = 0.57/(0.57+0.59) = 0.57 / 1.16 = 0.49

Mole fraction of toluene (Xb) = 0.59/(0.57+0.59) = 0.50

Partial pressure = (XaPa + XbPb)

                          = 0.49 × 103.4 + 0.50 × 46.9

                          = 50.666 + 23.45 = 74.11 torr

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Ion-dipole intermolecular forces of attraction is present between a sodium cation and chloromethane molecule.

The different types of intermolecular forces of attraction are London dispersion forces (LDF), ion-ion, ion-dipole, dipole-dipole, and hydrogen bonding. Molecules could have a mixture of these kinds of intermolecular forces.

Chloromethane, CH3Cl, is considered to be slightly polar due to the carbon-chlorine bond, wherein the chlorine is slightly negative due to its higher electronegativity compared to carbon. With this, the dominant intermolecular forces between CH3Cl are dipole-dipole forces. If a sodium cation is added to the solution, then there would be ion-dipole intermolecular forces of attraction.

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The statement which best describes why most individual organisms never fossilized is that Conditions for fossilization are rare.

Fossilization is a term which ia defined as the mechanisms which are chemical, physical, and biological which results in the preservation for long term of animals and plants renants. Fossilization is a type of negative representation of the creatures which is preserved in the substrates as fossil.

The reason for the lack of these fossilized parts can be explained as these parts quickly decompose.

Thus, we concluded that the statement which best describes why most individual organisms never fossilized is that Conditions for fossilization are rare.

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Answer: an electric generator

Explanation:

The answer is A) An electric generator.

Kinetic power is the strength of the movement, observable as the motion of an item, particle, or set of debris. Any item in motion is using kinetic electricity: someone on foot, a thrown baseball, a crumb falling from a desk, and a charged particle in an electric field are all examples of kinetic power in paintings.

There are 3 subcategories of kinetic energy: vibrational, rotational, and translational. Vibrational kinetic strength is, unsurprisingly, a result of items vibrating. Rotational kinetic power is created with the aid of shifting items, while translational kinetic power is due to gadgets colliding with one another.

Something at domestic that moves are an instance of kinetic energy. this can be a cue ball rolling on a billiards table, a fan circulating air on a warm day, or glass shattering on the floor after it falls from the counter. electrical gadgets that are becoming on use kinetic energy as do humans transferring about the residence.

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Answer:

Explanation:

The correct answer is

energy resulting from the flow of charged particles , such as electrons or ions.

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Answer:

59.9% is the percent yield for the 4.5 g of produced Al₂S₃

Explanation:

Let's determine the reaction:

3S  +  2Al  →  Al₂S₃

First of all, let's determine the limiting reactant. We need to convert the mass to moles:

4.8 g /32.06g/mol = 0.150 moles of S

5.4 g / 26.98 g/mol = 0.200 moles of Al

3 moles of S react to 2 moles of Al

Then, 0.150 moles of S may react to (0.150 . 2)/3 = 0.1 ,moles of Al

We have 0.200 moles and we only have 0.1. As we have excess of Al, this is the excess reactant. In conclussion, the limiting reagent is S.

2 moles of Al react to 3 moles of S

Then 0.2 moles of Al may react to (0.2 . 3) /2 = 0.3 moles of S. (We only have 0.150 moles)

Let's go to the product, 3 moles of S can produce 1 mol of Al₂S₃

Then 0.150 moles of S, may produce (0.150 . 1) /3 = 0.05 moles.

We convert moles to mass to determine the thoretical yield:

0.05 mol . 150.15g /mol =  7.50g

Percent yield = (Produced yield/Theoretical yield) . 100

% = (4.5g / 7.5g) . 100 = 59.9%

Answer:

In Australia, it's warmer than most of the United States during winter.

Explanation:

Answer:

When you move atoms toward each other, the electrons move around between the two atoms. When you try to move the atoms two close, their positive nuclei repel each other.

A sample that is not finely ground creates difficulties in melting point determination due to inconsistent sample size and poor heat transfer. To obtain accurate results, it is essential to grind the sample finely, ensuring uniform particle size and efficient heat transfer during the melting point determination process.

A sample that is not finely ground can create difficulties in a melting point determination for two main reasons.

Firstly, larger particle sizes can lead to an inaccurate melting point reading. When a sample is not finely ground, it may contain larger particles that have a higher melting point than the rest of the sample. These particles can take longer to melt than the rest of the sample, leading to a broader and inaccurate melting point range.

This can make it difficult to accurately determine the true melting point of the sample, which is important for identifying its chemical properties.

Secondly, a sample that is not finely ground can also result in poor heat transfer, leading to an inaccurate melting point determination. During a melting point determination, the sample needs to be heated at a constant rate to ensure accurate results.

However, larger particles may not conduct heat as effectively as smaller particles, which can lead to localized overheating or underheating. This can cause the sample to melt at a higher or lower temperature than expected, leading to inaccurate melting point readings.

Therefore, it is important to finely grind a sample before conducting a melting point determination to ensure accurate and reliable results.

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Answer:

B. Ca is the answer

Explanation:

i took the test

The element would most likely have chemical properties similar to that of magnesium (Mg) is Ca.

An attribute of a specific material that is seen in a chemical reaction was called a chemical property. Major chemical characteristics include chemical stability, flammability, toxicity, the heat of combustion, pH value, and rates of radioactive decay.

A substance that could not be further decomposed through any chemical reaction would be known as a chemical element.

The magnesium and calcium belongs to identical group hence, both elements have same valence electrons including chemical property.

Therefore, the correct answer will be option (B).

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Volume = 5x3x10 = 150 cm cubed

Mass = 150x100 = 15000 grams

Density = 15000/150 = 100g/cm cubed

Answer:

2 C2H2 + 5 O ---> 4 CO2 + 2 H2O

Explanation:

combustion reactions always end with CO2 + H2O

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From 60 grams of ethane, we can expect the production of 6 moles of water.

The balanced chemical equation for the combustion of ethane is:

C2H6 + 3O2 → 2CO2 + 3H2O

From the equation, we can see that for every 1 mole of ethane (C2H6) that reacts, 3 moles of water (H2O) are produced.

To calculate the number of moles of water produced from 60 grams of ethane, we need to first determine the number of moles of ethane:

moles of ethane = mass of ethane ÷ molar mass of ethane

moles of ethane = 60 g ÷ 30 g/mol

moles of ethane = 2 mol

So, for 2 moles of ethane that react, we can expect the production of 3 x 2 = 6 moles of water.

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Answer:

Average ocean pH is now 8.1 and varies seasonally

Explanation:

The number of vacancies comes out to be 3.52 *10¹⁸/cm³ that can be shown in the below expalnation.

The number of vacancies can be calculated using the below formula-

Nv = N exp (-Qv / kT)

     = (Na x D / A) exp (-Qv / kT)

It is given that,

D = 18.63 g/cm³

Na is known which is 6.022*10²³ atoms/mol also called Avogadro's number.

Qv = 0.98 eV/atom

T = 1173 K

K = 8.65*10⁻⁵ eV/atom-K

Substituting these values in the above equation as follows-

Nv = (6.02*10²³ atoms/mol) (18.63 g/cm3) / (1969.9 g/mol) exp (0.98 ev/atom / (86.2*10⁻⁵ ev atom -K)(1173 K)

    = 3.52 *10¹⁸/cm³

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A wavy pattern of dark and light bands on the bottom of a pond is caused by refraction of light waves through a rough surface; option D.

Destructive interference occur when two waves come in contact with each other and cancel each other out.

Reflection and refraction of light waves can result in destructive interference. An example of destructive interference due to refraction of light is a wavy pattern of dark and light bands on the bottom of a pond.

In conclusion, destructive interference occurs when waves cancel each other out.

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The answer to the question is D.

The thing that will happen if the mechanisms for communication of ideas and discussion of science production did not exist is that researches will be harder to make.

The transmission of information is commonly defined as communication. The term can also refer to the message itself or to the field of study that investigates such transmissions.

Because the active role of all participants in this process is recognized, the term "science communication" is now more commonly used than "popularization." Making science more accessible to the general public can help to alleviate society's current confusion and instill hope for the future.

Effective communication is critical to addressing the diversity and inclusion issues that plague science. Without effective communication, gatekeeping will persist, and barriers to understanding science will remain.

Aside from benefiting society as a whole, communicating outside the scientific community can help a researcher's career by increasing the impact of their latest findings, fostering new collaborations across sectors, raising their public profile, and opening doors to unexpected opportunities

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Answer:

Explanation:

The speed of an object can be found by using the formula

\(v = \frac{d}{t} \\ \)

where

d is the distance

t is the time taken

From the question we have

\(v = \frac{100}{30} = \frac{10}{3} \\ = 3.333333...\)

We have the final answer as

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Cadmium (Cd) element is classified as a metal.

Metals are characterized as elements with high electrical conductivity, transparency, brilliance, and malleability, as well as the ability to rapidly shed electrons and create positive ions (cations).

Metals are to the left of the line (excluding hydrogen, which is a nonmetal), nonmetals are to the right of the line, and elements immediately adjacent to the line that exhibit properties of both metals and nonmetals and are called as metalloids.

So, boron, antimony and bismuth are classified as metalloids, where the element cadmium is a metal.

Hence, the correct option is D

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The pH of a 0.01 M solution of a weak acid with a pKa of 6 is 4.

To calculate the pH of a 0.01 M solution of a weak acid with a pKa of 6,

1. Write down the given values: pKa = 6, [Acid] = 0.01 M.
2. Calculate the Ka value using the pKa: Ka = 10^(-pKa) = 10^(-6).
3. Use the Ka expression to set up an equation for the acid ionization:
  Ka = [H+][A-]/[HA],

where [H+] is the concentration of hydrogen ions, [A-] is the concentration of the conjugate base, and [HA] is the concentration of the weak acid.
4. Since the acid is weak, assume that the initial concentration of [A-] and [H+] is negligible compared to the initial concentration of the acid.
5. As the acid ionizes, the concentration of [H+] and [A-] will increase by x, while the concentration of [HA] will decrease by x.
6. Write the equation with the new concentrations: Ka = (x)(x)/(0.01 - x).
7. Because the acid is weak, we can assume that x is much smaller than 0.01, so the equation can be simplified to Ka = x^2/0.01.
8. Solve for x: x^2 = Ka * 0.01 = 10^(-6) * 0.01.
9. Find the square root of both sides to find the concentration of [H+]: [H+] = x = sqrt(10^(-6) * 0.01) = 10^(-4) M.
10. Finally, calculate the pH using the formula

pH = -log[H+]:

pH = -log(10^(-4)) = 4.

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Newtons laws of motion:  For the planetary motion puzzle, Newton correctly identified the variables force and momentum. I hypothesize that momenta and forces are the appropriate variables to characterize the motion of the planets, as stated in Newton's grant request.

Do you think Newton believed in hypothesis?

Newton vehemently resisted the hypothesis-based approach, insisting that theories regarding the origins and characteristics of appearances, such as the laws of motion, be deduced from the facts instead.

A fundamental formulation for a hypothesis is "If this happens, then this will happen." Specifying what will happen to the dependent variable if you change the independent variable is one technique to formulate your hypothesis.

There are six forms of hypothesis and they are:

Simple hypothesis.

Complex hypothesis.

Directional hypothesis.

Non-directional hypothesis.

Null hypothesis.

Associative and casual hypothesis.

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One essential amino acid found in milk, eggs, and other foods is called "leucine." Leucine is an essential amino acid, which means that our bodies cannot produce it and we must obtain it from our diet.

Leucine plays a crucial role in protein synthesis and muscle repair. It is also involved in regulating blood sugar levels, promoting wound healing, and producing growth hormones. It is especially important for athletes and individuals engaging in regular exercise, as it helps support muscle growth and recovery.

Apart from milk and eggs, other food sources rich in leucine include meat (such as beef, pork, and poultry), fish, soybeans, nuts, seeds, and legumes. Including a variety of these foods in your diet can help ensure an adequate intake of leucine and other essential amino acids.

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During electrolysis a metal chemically decompose and deposits on the cathode where as the metal from the other electrode forms its ions in the electrolyte solution.

Electrolysis is the process of chemical decomposition brought out by the passage of electricity through an electrolyte in which the decomposed metal deposits on one electrode.

Electrolysis involves oxidation of one metal and reduction of the other. The prediction of the products of electrolysis requires a consideration of several factors including the potential at which the competing species are discharged at the electrode , if the electrode used are reacted or inert etc.

The oxidation reaction involves the formation of cations in the solution and the reduction involves the deposition of metallic substance at the cathode.

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The work (newton-metres) the dock worker have to exert to lift the boat to 5 m in air is 6506.85 Nm

This is simply defined as the product of force and distance moved in the direction of the force. Mathematically, it can be expressed as

Workdone (Wd) = force (F) × distance (d)

Wd = Fd

Output work = Fd

Output work = 950 × 5

Output work = 4750 Nm

Efficiency = (output / input) × 100

73% = 4750 / input

0.73 = 4750 / input

Cross multiply

0.73 × input = 4750

Divide both side by 0.73

Input work = 4750 / 0.73

Input work = 6506.85 Nm

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Answer: Answer b

Explanation:

Answer:

3.79 grams

Explanation:

22.4= STP volume .          Molar mass of NH3=17.031

5.00 NH3 × (1 mol/22.4 L) =0.223

convert to grams->

0.223× 17.031= 3.79

According to ideal gas equation and standard temperature and pressure conditions the mass in grams of ammonia is 0.037 g.

The ideal gas law is a equation which is applicable in a hypothetical state of an ideal gas.It is a combination of Boyle's law, Charle's law,Avogadro's law and Gay-Lussac's law . It is given as, PV=nRT where R= gas constant whose value is 8.314.The law has several limitations.

The law can be derived from microscopic kinetic theory .All the other gas laws equations can be derived from ideal gas equation, In the given example at standard temperature and pressure conditions, P=1 atmosphere

V=5 L , molar mass of ammonia=17.031 g/mole,R=8.314 T=273 K

Substituting all these values in ideal gas equation,

mass=PV×molar mass/RT

mass=1×5×17.031/8.314×273=0.037 g

Thus the mass of ammonia gas in grams at STP is 0.037 g.

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Launching a projectile over a significant distance, such as several hundred miles, presents a range of complex challenges that must be carefully addressed. The success of achieving such a long range relies on accounting for various factors that influence the projectile's trajectory, including aerodynamics, atmospheric conditions, Earth's curvature, and external forces.

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Answer:

Many fossil fuels contain sulfur impurities. When these fuels are burned, the sulfur is oxidised to form sulfur dioxide. This sulfur dioxide then dissolves in droplets of rainwater to form sulfurous acid.

Explanation:

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