Which atomic model is the one accepted by scientists today?

A) Dalton's model

B) Rutherford's model

C) quantum mechanical model

D) Bohr's model

Answer:

She transfers energy out of the medicine until it is solid. So the answer would be C.

Explanation:

According to the forces of attraction , molecules can be slowed down by moving out of the medicine until it is a solid , it will decrease the rate of absorption of medicine.

Forces of attraction  is a force by which atoms in a molecule  combine. it is basically an attractive force in nature.  It can act between an ion  and an atom as well.It varies for different  states  of matter that is solids, liquids and gases.

The forces of attraction are maximum in solids as  the molecules present in solid are tightly held while it is minimum in gases  as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.

The physical properties such as melting point, boiling point, density  are all dependent on forces of attraction which exists in the substances.

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The empirical formula of polyethylene can be determined by converting the given percentages of carbon (C) and hydrogen (H) into grams. To find the grams of each element, we assume a 100.0 g sample of polyethylene.

For carbon:

Mass of carbon = 86.0% × 100.0 g = 86.0 g

For hydrogen:

Mass of hydrogen = 14.0% × 100.0 g = 14.0 g

Therefore, in a 100.0 g sample of polyethylene, there are 86.0 grams of carbon and 14.0 grams of hydrogen.

The empirical formula of a compound represents the simplest whole-number ratio of atoms present in the compound. To determine the empirical formula, we need to find the ratio of carbon to hydrogen in terms of moles.

First, we convert the masses of carbon and hydrogen into moles using their respective molar masses. The molar mass of carbon is approximately 12.01 g/mol, and the molar mass of hydrogen is approximately 1.008 g/mol.

Number of moles of carbon = 86.0 g / 12.01 g/mol ≈ 7.162 mol

Number of moles of hydrogen = 14.0 g / 1.008 g/mol ≈ 13.89 mol

Next, we divide the number of moles of each element by the smallest number of moles to get a simplified ratio.

Carbon: Hydrogen ≈ 7.162 mol : 13.89 mol ≈ 1 : 1.939

Since we want to express the ratio in whole numbers, we multiply both sides by 2 to get a whole number ratio.

Carbon: Hydrogen ≈ 2 : 3.878

Rounding to the nearest whole number, we find that the empirical formula of polyethylene is CH₂.

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The following statement is true concerning the results of the Human Genome Project:

The Human Genome Project has raised many complicated ethical issues.

What is Human Genome?

The human genome refers to the complete set of genetic information (DNA) present in human cells. It includes both the protein-coding and non-coding regions of DNA. The human genome is made up of about 3 billion base pairs and is organized into 23 pairs of chromosomes. The study of the human genome is an important field of genetics and has many implications for understanding human biology, evolution, and disease.

The Human Genome Project was a scientific research project that aimed to identify and map all the genes in the human genome, which contains all the genetic information needed for human development and function. The project was completed in 2003 and provided a wealth of information about the structure and function of the human genome, including the location and sequence of all human genes.

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The empirical formula of the compound is Iridium:Oxygen = 1:2 or IrO2.

The empirical formula of a compound is the simplest whole number ratio of its elements.

To find the empirical formula of this compound, we first need to convert the masses of Iridium and Oxygen to moles.

The molar mass of Iridium is 192 g/mol, so the number of moles of Iridium is:

1.26 g / 192 g/mol = 0.006562 mol

The molar mass of Oxygen is 16 g/mol, so the number of moles of Oxygen is:

0.210 g / 16 g/mol = 0.013125 mol

Next, divide each mole value by the smallest mole value (0.006562 mol), to get the mole ratio of the elements:

Iridium: 0.006562 mol / 0.006562 mol = 1

Oxygen: 0.013125 mol / 0.006562 mol = 2

So, the empirical formula of the compound is Iridium:Oxygen = 1:2 or

IrO2.

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Answer:

According to (LDL) , development of atherosclerosis is caused by a high concentration of LDL‐cholesterol in the blood, and lowering LDL‐cholesterol reverses,  atherosclerosis, so preventing cardiovascular disease.

Explanation:

Answer:

Cholesterol and Atherosclerosis

Explanation:

The "bad" cholesterol is called LDL or low-density lipoprotein. LDL can damage your arteries that carry blood from your heart to the rest of your body. Then once the damage has started, LDL keeps on penetrating and building up in the artery walls

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Among the alkaline earth metals, beryllium (Be) has the fewest number of occupied electron shells.

The alkaline earth metals are a group of chemical elements in the periodic table that include beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra).

Among the alkaline earth metals, beryllium (Be) has the fewest number of occupied electron shells. Beryllium has an electron configuration of 1s2 2s2, meaning it has only two occupied electron shells: the first shell, which can hold up to two electrons, and the second shell, which can hold up to eight electrons. In contrast, the other alkaline earth metals have at least three occupied electron shells. For example, magnesium has an electron configuration of 1s2 2s2 2p6 3s2, meaning it has three occupied electron shells.

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A helium-filled balloon has a volume of 4.50 L at a barometric pressure of 747.3 mmHg. Given the balloon’s volume is neither increasing nor decreasing, the pressure of the helium inside the balloon is 747.3 mmHg.

A helium-filled balloon has a volume of 4.50 L when the temperature is 22.5 degrees C and the barometric pressure is 747.3 mmHg.

Barometric pressure is the measurement of air pressure in the atmosphere, specifically the measurement of the weight exerted by air molecules at a given point on Earth.

The pressure of the helium gas is the force that the gas exerts on the container boundaries, in this case, the balloon.

We know that the balloon’s volume is neither increasing nor decreasing. This means that the barometric pressure and the pressure of the helium gas are at equilibrium. That is, the pressure of the gas is 747.3 mmHg as well.

A helium-filled balloon has a volume of 4.50 L at a barometric pressure of 747.3 mmHg. Given the balloon’s volume is neither increasing nor decreasing, the pressure of the helium inside the balloon is 747.3 mmHg.

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A sample of ground beef contains 18.9% protein and 21.4% fat both by mass. Therefore, 147.5kilocalories are in 125g of the ground beef.

The calorie is an energy unit derived from the now-defunct thermodynamic theory of heat. Two primary meanings of "calorie" are widely used for historical reasons.

Originally, a big calorie, meal calorie, dietary calorie, and kilo calorie was defined as the quantity of heat required to increase the temperature with one kilogram of water through one degrees Centigrade (or one kelvin). The amount of heat required to create the same rise in one gram of water was characterized as a tiny calorie or gram calorie.

Let the required calorie of ground beef be m .

protein in it = .18m

fat in it =  .21m

1 gram of protein gives 4 cals .

1 gram of fat gives 9 cals .

4 x .18m  + 9 x  .21m = 350

m = 147.5kilocalories

Therefore, 147.5kilocalories are in 125g of the ground beef.

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Global warming brought on by rising carbon dioxide concentrations in the atmosphere is changing weather patterns and ocean temperatures. Changes in precipitation patterns are being brought on by the warming of the atmosphere.

Because it is one of the gases in the atmosphere that causes the greenhouse effect, which causes the Earth to warm, carbon dioxide is known as a greenhouse gas. Long-wavelength infrared radiation (heat) from the Earth is absorbed by carbon dioxide molecules in the atmosphere, and some of it is then radiated back downward.

Similarly, as air temperatures rise in response to rising carbon dioxide concentrations, more water vapor escapes into  the atmosphere—which then amplifies greenhouse heating

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Answer:

air

Explanation:

Vocal folds vibrate when excited by aerodynamic phenomena; they are not plucked like a guitar string. Air pressure from the lungs controls the open phase. The passing air column creates a trailing “Bernoulli effect,” which controls the close phase.

The human population grew from 1 billion in the year 1800 to approximately 7.8 billion in the year 2021.

In the year 1800, the estimated global human population was around 1 billion. Over the next two centuries, significant advancements in technology, medicine, agriculture, and improved living conditions contributed to a rapid increase in population.

The growth rate of the human population began to accelerate in the 20th century. By the year 1927, the global population reached 2 billion. It took just 33 years for the population to double, reaching 4 billion in 1960. The population continued to grow at an unprecedented rate, with 6 billion people on Earth by the year 1999. As of 2021, the estimated global population stands at approximately 7.8 billion.

This remarkable growth in population can be attributed to several factors, including advancements in healthcare leading to reduced infant mortality rates, improved access to education and contraception, increased agricultural productivity, and overall socio-economic development.

It's important to note that population growth has not been uniform across all regions. Different countries and regions have experienced varying rates of population growth due to factors such as fertility rates, mortality rates, migration patterns, and government policies.

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Answer:

where are the following organisms

The vessel's internal pressure is atm, is  \(6.66*10^{-6} atm\)

A vacuum pump is a machine that expels air or gas from a sealed space in order to create a partial vacuum and a difference in pressure. Based on the pressure needs and the application it serves, vacuum pumps are designed using a range of technologies.Fatal accidents have happened in the history of pressure vessel invention and use, proving that pressure vessels can be harmful.A container designed to carry gases or liquids at a pressure much higher than atmospheric pressure is known as a pressure vessel.

The pressure in the vessel in atm is \(6.66 * 10^{-6} atm\).

To calculate this, we first convert \(5.0 * 10^{-3} mmHg\) to atm.

1 mmHg = 0.001315789 atm

Here, \(5.0 * 10^{-3} mmHg = 6.66 * 10^{-6} atm.\)

Therefore, the pressure in the vessel in atm is \(6.66*10^{-6} atm\)

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Answer:

Germanium

Explanation:

An example of heterogeneous equilibrium is:

Heterogeneous equilibrium refers to an equilibrium state in a chemical reaction where the reactants and products exist in different physical states or phases. It occurs when substances in different phases, such as solids, liquids, and gases, are involved in a chemical reaction.

Considering the given equations:

The equation I: FeO(s) + CO(g) ⇌ Fe(s) + CO₂(g) represents a heterogeneous equilibrium.

This is because the reactants and products involve different phases (solid and gas). FeO is a solid (s), CO is a gas (g), Fe is a solid (s), and CO₂ is a gas (g). The reaction involves the conversion of a solid and a gas to another solid and a gas, and the equilibrium is established between these different phases.

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This kind of matrix composite is renowned for strengthening the dispersive material's resistance to fracture. metals, ceramics, and polymers.

Ceramic matrix composites (CMC) are substances made of both ceramic and composite components.It consists of two parts: a matrix that holds the material together and a reinforcement that gives the material its tensile strength. When ceramic matrix composites have a scattered phase, it is primarily because the material's toughness has increased, which has increased the tensile strength.

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Answer:

d

Explanation:

Mol of NiCl2 is 0.81mol

Mol of Na3PO4 is 0.64mol

Na3PO4 is limiting in this reaction

Mol ratio of Na3PO4 is 1 : 1

So mol of NaCl produced is 0.64mol

Mr of NaCl is 58.5

Mass of NaCl produce = 0.64mol×58.5 = 37.44g

Answer:

chloroplast, then ATP

Explanation:

because i did this before

Sand casting, which makes up around 70% of all metal casting, is the most common casting technique. A design of the finished object is created in wood or metal and employed in the process of "sand casting,".

Casting techniques are a class of manufacturing procedures used to turn liquid materials like metal, plastic, or ceramics into solid things. The liquid substance is put into a mould and given time to harden and assume the contours of the hollow. Casting techniques come in a variety of forms, including sand casting, investment casting, die casting, shell casting, and lost foam casting. The kinds of materials that can be cast, the degree of accuracy and surface quality, and the complexity of the pieces that can be created are only a few of the distinctive characteristics that each casting technique has. The automobile, aerospace, and construction industries all use casting techniques extensively.

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Answer:

The classification is mentioned below for the particular topic.

Explanation:

⇒      \(3Zn+2H_{3}Po_{4}\rightarrow Zn_{3}(Po_{4})_{2}+3H_{2}\)

Answer:

The coldness will move from the pan to the ice cube. ... Thermal energy moved from a cooler object to a warmer object through radiation.

Explanation:

Transformation in chemistry is scientifically used to explain the process of changing one compound to another in a chemical reaction.

The word "transformation" has a very special significance in chemistry. We know that in English, to transform would simply imply to change from one form to another. This is not quite far from its meaning in the parlance of chemistry.

The word transformation is normally applied in the area of chemical reactions especially as it has to do with reaction with in organic chemistry. It has to do with the change from one molecule to another and this is of great importance in the discussion of synthetic chemistry.

As such, the word transformation in chemistry is scientifically used to explain the process of changing one compound to another in a chemical reaction.

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Newton's first law of inertia says that an object at rest will stay at rest and an object in motion will stay in motion unless acted on by a force; thus the statement is True

The law of inertia is also known as Newton's first law of motion.

The law of inertia states that a body at rest or that is moving at constant or uniform motion along a straight line will remain in its state of rest or motion or uniform motion along a straight line unless acted upon by an external force.

The law of inertia explains why it s difficult to start an object moving or to stop a moving object.

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Answer:

Unsweetened tea

Explanation:

A concentrated solution is a solution that has more of the solute in it than the solvent (water).

A diluted solution is a solution that has more solvent (water) than the solute.

From the above we can say that the sweet tea contains more of the tea than water i.e it is concentrated hence, the taste is sweet. On the other hand, we can say that the unsweetened tea contains more water than the tea i.e it is diluted hence, the unsweetened taste.

Answer:

The answer is Conduction

Explanation:

Conduction is the process of heat being transferred between objects through direct contact, and it's the most common type of heat transfer.

Answer:

The answer is Conduction

Explanation:

Conduction is the process of heat being transferred between objects through direct contact, and it's the most common type of heat transfer.

I hope this helps!

We are given:

Acceleration of the object (a) = 8.2 m/s²

Force applied on the object (F) = 20.1 newtons

Mass of the object (m) = m kg

Solving for the mass of the object:

From newton's second law of motion:

F = ma

replacing the variables

20.1 = m * 8.2

m = 20.1/8.2

m = 2.45 kg

Hence, the object weighs 2.45 kg

Answer:

The temperature of the gas is 293.15 K.

The temperature of the gas is 303.15 K.

The new pressure of the gas is 0.97 atm.

Explanation:

You need to add 273.15 to the Celsius temperature to convert from Celsius to Kelvin.

So,

20.0°C + 273.15 = 293.15 K.

30.0°C + 273.15 = 303.15 K.

We can use the following equation to calculate the new pressure:

\(P_2 = P_1 *\frac{T_2}{T_1}\)

where:

Plugging in the values from the problem, we get:

\(P_2 = 1.00 atm * \frac{303.15 K }{293.15 K} = 0.97 atm\)

Therefore, the new pressure of the gas is 0.97 atm.

okay so the  Answer is c

The ball and stick model of C subscript 2 H subscript 4 is described as Option C: Each C has 2 H's connected to it each by 1 black.

This means the same as the 3D structure image of ethylene (C2H4) and means 2 C's connected by 2 black lines.

line.

The structure of ethylene is made up of 2 carbon atoms and 4 hydrogen atoms.

The carbon atoms are located at the middle position and the hydrogen atom surrounding the carbon atoms with two hydrogen atoms connected to each carbon atom. The two black lines connecting the carbons are the double bonds.

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Answer:

C

Explanation: