Whats principle of Aristotle's do scientist use today

Answer:

B) "When substances are chemically combined, the properties of the new substances that are formed are often different from the properties of the original substances."

Explanation:

From the information given, the question was juxtaposing how dangerous the reactants Sodium and Chlorine were at their elemental, natural states with how harmless the product is by combining both of them. There isn't any other statement beside B which is supported by this.

Usually however, most reactions that make NaCl are done through acid-base titrations because they form the salt and water when neutralized.  

Answer:

B

Explanation:

All substances have their own unique chemical and physical properties. When substances are chemically combined (i.e., when substances undergo a chemical reaction), the properties of the new substances that are formed are often different from the properties of the original substances.

Answer: D

Explanation:

Answer:

Water molecules will move across the semipermeable membrane from the 0.12% protein solution to the 0.15% protein solution in a process known as osmosis.

Explanation:

Due to the difference in the concentrations of the two solutions as well as the presence of a semipermeable membrane, a concentration gradient is setup. The 0.15% protein solutions contains more protein molecules than the 0.12% protein solution. Water molecules will move across the semipermeable membrane from the 0.12% protein solution to the 0.15% protein solution in a process known as osmosis.

Osmosis is the movement of water molecules across a semipermeable membrane from a region of lower solute concentration or higher concentration of water molecules to a region of higher solute concentration or lower concentration of water molecules until an equilibrium concentration is attained.

This is a passive process and is facilitated by the concentration gradient as well as a presence of a semipermeable membrane which allows only water molecules to move across it but not solute molecules.

Assuming a similar number of molecules, the matter that occupies the most space is gas. Option C is correct.

This is because gases have no definite shape or volume, and their molecules are spread out, moving freely in all directions. As a result, gases tend to occupy the entire volume of their container and expand to fill the available space. This is known as the "kinetic molecular theory" of gases.

In contrast, solids and liquids have a definite volume and shape. Solids have a fixed shape and their molecules are packed closely together, while liquids have a variable shape and their molecules are less closely packed. As a result, both solids and liquids occupy less space than gases.

It is worth noting that the volume of a solid or liquid can change under certain conditions, such as changes in temperature or pressure. However, even under these conditions, the space occupied by a solid or liquid is still less than that occupied by a gas. Option C is correct.

The complete question is

Which of the following matters occupies more space, assuming similar number of molecules?

A. Solid

B. Liquid

C. Gas

D. Solid and gas

To know more about the Matter, here

https://brainly.com/question/30028447

#SPJ1

Answer: the answer you are looking for does not exist

Explanation:

The atomic mass of element R is 151 (no decimals).

To calculate the atomic mass of element R, we need to consider the relative abundance of each isotope and its corresponding mass. The atomic mass is the weighted average of the masses of all the isotopes, taking into account their relative abundance.

Given:

Isotope 1: Relative abundance = 0.0398, Mass = 191

Isotope 2: Relative abundance = 0.1614, Mass = 180

Isotope 3: Relative abundance = 0.7988, Mass = 143

To calculate the atomic mass, we multiply the relative abundance of each isotope by its mass, and then sum up the results.

Atomic mass = (Relative abundance of Isotope 1 * Mass of Isotope 1) + (Relative abundance of Isotope 2 * Mass of Isotope 2) + (Relative abundance of Isotope 3 * Mass of Isotope 3)

Atomic mass = (0.0398 * 191) + (0.1614 * 180) + (0.7988 * 143)

Calculating the values:

Atomic mass = 7.6098 + 29.0256 + 114.6872

Atomic mass = 151.3226

Rounding to the nearest whole number, the atomic mass of element R is 151.

For more such question on mass. visit :

https://brainly.com/question/24191825

#SPJ8

After the reaction is complete, no nitrogen and no hydrogen molecules remain, and 8.00 x 1014 molecules of NH3 are produced.

In the equation, nitrogen and hydrogen react at a high temperature, in the presence of a catalyst, to produce ammonia, according to the balanced chemical equation:N2(g)+3H2(g)⟶2NH3(g)The coefficients of each molecule suggest that one molecule of nitrogen reacts with three molecules of hydrogen to create two molecules of ammonia.

So, to determine how many molecules of ammonia are produced when four nitrogen and nine hydrogen molecules are present, we must first determine which of the two reactants is the limiting reactant.

To find the limiting reactant, the number of moles of each reactant present in the equation must be determined.

Calculations:
Nitrogen (N2) molecules = 4Hence, the number of moles of N2 = 4/6.02 x 1023 mol-1 = 6.64 x 10-24 mol
Hydrogen (H2) molecules = 9Hence, the number of moles of H2 = 9/6.02 x 1023 mol-1 = 1.50 x 10-23 mol

Now we have to calculate the number of moles of NH3 produced when the number of moles of nitrogen and hydrogen are known, i.e., mole ratio of N2 and H2 is 1:3.

The mole ratio of N2 to NH3 is 1:2; thus, for every 1 mole of N2 consumed, 2 moles of NH3 are produced.
The mole ratio of H2 to NH3 is 3:2; thus, for every 3 moles of H2 consumed, 2 moles of NH3 are produced.
From these mole ratios, it can be observed that the limiting reactant is nitrogen.

Calculation for NH3 production:
Nitrogen (N2) moles = 6.64 x 10-24 moles
The mole ratio of N2 to NH3 is 1:2; therefore, moles of NH3 produced is 2 × 6.64 × 10−24 = 1.33 × 10−23 moles.

Now, to determine how many molecules of NH3 are produced, we need to convert moles to molecules.
1 mole = 6.02 x 1023 molecules
Thus, 1.33 x 10-23 moles of NH3 = 8.00 x 1014 molecules of NH3 produced.

To find the amount of each reactant remaining after the reaction is complete, we must first determine how many moles of nitrogen are consumed, then how many moles of hydrogen are consumed, and then subtract these from the initial number of moles of each reactant.

The moles of nitrogen consumed = 4 moles × 1 mole/1 mole N2 × 2 mole NH3/1 mole N2 = 8 moles NH3
The moles of hydrogen consumed = 9 moles × 2 mole NH3/3 mole H2 × 2 mole NH3/1 mole N2 = 4 moles NH3
Thus, the moles of nitrogen remaining = 6.64 × 10−24 mol – 8 × 2/3 × 6.02 × 10^23 mol-1 = 5.06 × 10−24 mol
The moles of hydrogen remaining = 1.50 × 10−23 mol – 4 × 2/3 × 6.02 × 10^23 mol-1 = 8.77 × 10−24 mol

Finally, the number of molecules of each reactant remaining can be calculated as follows:
Number of N2 molecules remaining = 5.06 × 10−24 mol × 6.02 × 10^23 molecules/mol = 3.05 × 10−1 molecules ≈ 0 molecules
Number of H2 molecules remaining = 8.77 × 10−24 mol × 6.02 × 10^23 molecules/mol = 5.28 × 10−1 molecules ≈ 0 molecules.

For more such questions on molecules

https://brainly.com/question/24191825

#SPJ8

The comparison of H1 H2 and H3 tags is that:

There are a lot of  different HTML headings and they are:  H2 and H3, H4, H5, H6, etc.

The use of H1 tags is said to be the one that is often used to show all that a person will get if they click on the title. It is seen as the main keywords that will appear in a sequence to bring in one's target audience.

Therefore, The comparison of H1 H2 and H3 tags is that:

Learn more about tags from

https://brainly.com/question/26294460

#SPJ1

Answer:

A. 4.5 mol Mg(OH)₂

B. 6 mol NaOH

Explanation:

Let's consider the following balanced equation.

Mg(NO₃)₂ + 2 NaOH ⇒ Mg(OH)₂ + 2 NaNO₃

PART A

The molar ratio of NaOH to Mg(OH)₂ is 2:1. The moles of Mg(OH)₂ produced from 9 moles of NaOH are:

9 mol NaOH × 1 mol Mg(OH)₂/2 mol NaOH = 4.5 mol Mg(OH)₂

PART B

The molar ratio of NaOH to NaNO₃ is 2:2. The moles of NaOH needed to produce 6 moles of NaNO₃ are:

6 mol NaNO₃ × 2 mol NaOH/2 mol NaNO₃ = 6 mol NaOH

Answer:

coefficient

Explanation:

It a part of the equation

Answer:

4

Explanation:

D=M/V

D=20.0/5

D=4

Answer:

Neon is chemically stable

Explanation:

Neon has an atomic number of 10

and hence has an electronic configuration of 2,8

since it's valence shell is complete it will not react with any other element and thus is the most stable

Substances in which atoms are  held together by polar covalent bonding is b)CsCl.So,correct option is b.

Polar covalent bond is a kind of compound bond where one sets of electrons is shared unevenly between two molecules. For instance, Hydrogen chloride (HCl) particle. The holding of hydrogen and chlorine iotas inclines more towards Cl particles since Cl is more electronegative in nature than hydrogen

Since Cs has one unpair of electron and Cl has five unpair electron. So, both of elements are favorable for formation of covalent bond.

Properties of Polar Covalent Compound

Hence,correct option is B.

To know more about polar covalent bond, visit here:

https://brainly.com/question/28295508

#SPJ4

First, we have to remember what a mass percentage means (in this particular case):

It is the amount of each element in a compound, and it is calculated as follows:

The addition of the different mass percentages is equal to 100%.

In this case, we have the percentage of one of the elements of the compound, we can make the respective subtraction:

Then, the answer is that the iodine mass percentage is 86.4%

Answer:

Chronic diseases are defined broadly as conditions that last 1 year or more and require ongoing medical attention or limit activities of daily living or both. Chronic diseases such as heart disease, cancer, and diabetes

Answer:

conditions that last 1 year or more and require ongoing medical attention or limit activities of daily living

Explanation:

Answer:

wow

Explanation:

it is because of my love for uh

Answer:

mass of kI = 74.55 Atomic mass

74.55 g ---> 1 mole

48.9 g --> ?

48.9 / 72

0.7 mole.

In one mole of kI --->

The chemical elements involved are; hydrogen, fluorine, boron and lithium

There are two hydrogen atoms, five fluorine atoms, one boron atom and one lithium atom.

Chemical compounds are represented symbolically by chemical formulas, which reveal the types and amounts of atoms that make up the compound. It is a succinct approach to explain a substance's makeup.

The components of a compound are identified in a chemical formula by their corresponding chemical symbols, which are typically derived from their English or Latin names. The number of atoms of each element in a single compound molecule is indicated by the subscripts that follow each element.

Learn more about chemical formula:https://brainly.com/question/32018188

#SPJ1

Answer:

C. 6

Explanation:

The atomic number of a number is related to the number of protons in the nucleus.

Calculating relative atomic mass of an element is ordered sequentially as followed:

Part 2:

1. Relative atomic mass of Magnesium =

((23.99 x 0.787) + (24.99 x 0.1013) + (25.98 x 0.1117)) / 100 = 24.31 amu

a) Percentage abundance of silver-109 =

100% - 51.86% = 48.14%

b) Average atomic mass of silver = (106.90509 x 0.5186) + (108.90470 x 0.4814) = 107.8682 amu.

Learn more on relative atomic mass here: https://brainly.com/question/28882057

#SPJ1

Answer:

The magnetic field

Explanation:

The statement that is true if the ΔEsys = -100 J is that the system looses 100J  of energy which is gained by the surroundings.

Note that the study of energy is what we call thermodynamics. We should note that according to the laws of thermodynamics, energy can not be created nor destroyed but can be converted from one form to another.

This implies that the energy that is lost by the system must be gained by the surroundings since there can never be energy that goes to waste in the system.

Recall that the universe is composed of the system and the surroundings and the energy that is lost by the system must be gained by the surroundings and vice versa. This would now be our guide in deciding which statement is right above from what we have in the question here.

Learn more about thermodynamics: https://brainly.com/question/1368306

#SPJ1

According to reaction

Mols of H_2O

\(\\ \tt\rightarrowtail 4.35(0.6)\)

\(\\ \tt\rightarrowtail 2.61mol\)

According to law of conservation of mass, 4.35 moles of water are produced when 2.80 moles of hydrogen  and 1.55 moles of oxygen react.

According to law of conservation of mass, it is evident that mass is neither created nor destroyed rather it is restored at the end of a chemical reaction .

Law of conservation of mass and energy are related as mass and energy are directly proportional which is indicated by the equation E=mc².Concept of conservation of mass is widely used in field of chemistry, fluid dynamics.

Law needs to be modified in accordance with laws of quantum mechanics under the principle of mass and energy equivalence.This law was proposed by Antoine Lavoisier in the year 1789.As 2.80 moles of hydrogen react with 1.55 moles of oxygen 2.80+1.55=4.35 moles of water are produced.

Learn more about law of conservation of mass,here:

https://brainly.com/question/28711001

#SPJ2

Answer:

D.

Explanation:

The immediate cause for the United States' entry into World War II was the attack on Pearl Harbor by Japan on December 7, 1941.

World War II was a global war that lasted from 1939 to 1945. It involved the majority of the world's nations, including all of the great powers, organized into two opposing military alliances: the Allies and the Axis.

Prior to this attack, the United States had maintained a policy of neutrality and had provided support to the Allies in the form of aid and supplies. However, the attack on Pearl Harbor, which resulted in the deaths of over 2,400 Americans, led to a declaration of war against Japan by the United States, and ultimately to the country's involvement in the larger global conflict.

Learn more on World War II here: https://brainly.com/question/27005787

#SPJ1

1. The hydronium ion concentration [H₃O⁺] is 4.05×10⁻⁸ M

2. The hydroxide ion concentration [OH⁻] is 1.14×10⁻⁶ M

3. The hydroxide ion concentration [OH⁻] is 1.53×10⁻¹¹ M

4. Solution B is basic

1. How do I determine the value of [H₃O⁺]?

We can obtain the value of [H₃O⁺] as follow:

[H₃O⁺] × [OH⁻] = 10¯¹⁴

Divide both sides by [OH⁻]

[H₃O⁺] = 10¯¹⁴ / [OH⁻]

[H₃O⁺] = 10¯¹⁴ / 2.47×10⁻⁷

[H₃O⁺] = 4.05×10⁻⁸ M

2. How do I determine the value of [OH⁻]?

The value of the hydroxide ion concentration [OH⁻] can be obtained as follow:

[H₃O⁺] × [OH⁻] = 10¯¹⁴

8.81×10⁻⁹ × [OH⁻] = 10¯¹⁴

Divide both side by 8.81×10⁻⁹

[OH⁻] = 10¯¹⁴ / 8.81×10⁻⁹

[OH⁻] = 1.14×10⁻⁶ M

3. How do I determine the value of [OH⁻]?

The value of the hydroxide ion concentration [OH⁻] can be obtained as follow:

[H₃O⁺] × [OH⁻] = 10¯¹⁴

6.55×10⁻⁴ × [OH⁻] = 10¯¹⁴

Divide both side by 6.55×10⁻⁴

[OH⁻] = 10¯¹⁴ / 6.55×10⁻⁴

[OH⁻] = 1.53×10⁻¹¹ M

4.How do I determine which solution is basic?

To k now which solution is basic, we shall determine the pH of each solution. Details below:

pH = –Log [H₃O⁺]

pH = –Log 4.05×10⁻⁸

pH of solution A = 7.4

pH = –Log [H₃O⁺]

pH = –Log 8.81×10⁻⁹

pH of solution B = 8.1

pH = –Log [H₃O⁺]

pH = –Log 6.55×10⁻⁴

pH of solution C = 3.2

Summary:

We know that the pH scale is a scale that gives an understanding of the variation of the acidity / alkalinity of a solution.

The scale ranges from 0 to 14 indicating:

Thus, solution B is basic

Learn more about hydroxide ion concentration, [OH⁻]:

https://brainly.com/question/19800885

#SPJ1

Answer:

Explanation:

Small changes in the chemical nature of polysaccharides can make a big difference in how they work in our bodies. Polysaccharides are complex carbohydrates found in things like fiber and medicines. Even tiny changes in their structure can affect how they are digested, how they interact with cells, and their overall impact on our health. Scientists can use these changes to create materials with specific properties or develop new treatments. So, even small tweaks in polysaccharides can have a significant impact on how they function in our bodies.

In the lewis diagram of N₂O molecule, a triple bond is formed between the nitrogen atoms, which means,  in the Lewis diagram the nitrogen atoms are connected with three lines.

The Lewis diagram is used to represent the way in which two or more atoms are bonded to each other. This is possible by using lines to represent bonds and dots to represent the electrons.

In the case of the molecule N₂O bonding occurs in such a way that the oxygen atom is connected  to one of nitrogen atoms. The nitrogen atom that is not connected to the oxygen will have 2 electrons which is represented by dots as the number of valence electrons is 5, but in case of triple bond three are used.

The oxygen atom  has 6 electrons represented by dots, which is equal to the number of valence electrons.

Considering the formal charges, the lewis structure in which the electronegative oxygen atom (O) contains a negative charge and the electropositive nitrogen atom (N) contains a positive charge represents bonding in the N₂O molecule.

To know more about lewis diagrams here

https://brainly.com/question/29573072

#SPJ4

Answer:

SI unit: kg/m³

but g/cm³ is commonly used

Explanation:

The result of the Heat Transfer experiment is given as follows:  "The molecule was increased in kinetic energy but in a random structure." (Option B)

Heat transfer is a thermal engineering subject that deals with the creation, consumption, conversion, and exchange of thermal energy across physical systems.

Heat transmission is categorized into several methods, including thermal conduction, thermal convection, thermal radiation, and energy transfer via phase shifts.

At 3 p.m., the water temperature is raised. The average kinetic energy of an item is related to its temperature. As a result, as temperature rises, so does average kinetic energy.

Kinetic energy is created by the random movement of molecules. Hence, the correct answer is "The molecule was increased in kinetic energy but in a random structure."

Learn more about Heat Transfer:
https://brainly.com/question/13433948

#SPJ1

Full Question:

A student investigated heat transfer using a bottle of water. The student placed the bottle in a room at  20.50C. The student measured the temperature of the water in the bottle at 7 a.m. and again at 3 p.m.  The data from the investigation are shown in the table below.

[See attached image]

Question:How would you describe the average kinetic energy of the water molecules in the bottle at 7 a.m. to  the average kinetic energy of the water molecules in the bottle at 3 p.m.