Dmitri mendeleev and henry moseley developed their periodic tables about forty years apart. During that time, many discoveries in chemistry were made. Which fact was most likely discovered between the time of mendeleev’s table and the time of moseley’s table that helped moseley develop his version?.

True.

In mathematical logic and formal systems, an entailment relationship between two statements means that the truth of the first statement logically implies the truth of the second statement. In other words, if the first statement is true, then the second statement must also be true.

The symbol "⊥" represents the logical contradiction, also known as the "falsum" or the "false." It is a statement that is always false, regardless of the truth values of any other statements.

In the given statement, {⊥} entails ⊥, the truth of the first statement, which is the set containing the logical contradiction, implies the truth of the second statement, which is also the logical contradiction. Since a contradiction always implies another contradiction, the statement is true.

In simple terms, a contradiction always leads to another contradiction, so the statement {⊥} entails ⊥ is true.

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Answer:

Explanation:

Proteins have two main secondary structures: alpha helices, which are spirals formed by hydrogen bonds between amino acids, and beta pleated sheets, [ which are formed by a bend in the amino acid with alternating hydrogen bonding between amino acids.

Answer:

Explanation:

There is a trick to this. Counting out the 4 places is easy enough.

Start at the 8 and count to your right. You land on the nine, but that is not quite your answer.

The 7 influences the 9 and the nine gets bumped up which makes it a 10. but you just record the zero part. The 1 gets added to the 2.

That in turn influences the 2 which makes it a three. So your answer is

893.0

The trick is that you must include the 0. You are guaranteeing that you know the accuracy of the fourth place. Weird but true.

It helps just slight to convert this to scientific notation.

8.9297 * 10^2  = 8.930 * 10^2

You get the same rounding problem as discussed above, but it might be a little easier to see.

You get the same answer and you have to go through the same steps.

Answer:

it improves the accuracy of the results

The compound that would form a precipitate in water is  BaSO4.

option d.

BaSO4 (barium sulfate) would form a precipitate in water because it is classified as an insoluble compound according to most solubility charts. When a compound is considered insoluble, it means that it has a very low solubility in water, resulting in the formation of solid particles or precipitate when dissolved in water.

In the case of BaSO4, it does not readily dissociate into ions in water and remains as solid particles, causing it to precipitate.

On the other hand, a. KCI (potassium chloride), b. NaOH (sodium hydroxide), and c. (NH4)2S (ammonium sulfide) are soluble compounds in water. They dissociate into ions and form homogenous solutions when dissolved in water, without forming a precipitate.

It's worth noting that solubility can vary depending on factors such as temperature and concentration, so it's always important to consult a solubility chart or reference for accurate and up-to-date information on specific compounds.option d.

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Answer:

Mass = 312 g

Explanation:

Given data:

Number of molecules of H₂ = 9.4 × 10²⁵

Mass in gram = ?

Solution:

First of all we will calculate the number of moles of H₂.

1 mole of H₂ contain 6.022× 10²³ molecules

9.4 × 10²⁵ molecules  × 1 mol / 6.022× 10²³ molecules

1.56× 10² mol

156 moles of H₂:

Mass in gram:

Mass = number of mole × molar mass

Mass = 156 mol × 2 g/mol

Mass = 312 g

This problem is providing the initial volume and pressure of nitrogen in a piston-cylinder system and asks for the final pressure it will have when the volume increases. At the end, the answer turns out to be 2.90 atm.

In chemistry, gas laws are used so as to understand the volume-pressure-temperature-moles behavior in ideal gases and relate different pairs of variables.

In this case, we focus on the Boyle's law as an inversely proportional relationship between both pressure and volume at constant both temperature and moles:

\(P_1V_1=P_2V_2\)

Thus, we solve for the final pressure by dividing both sides by V2:

\(P_2=\frac{P_1V_1}{V_2}\)

Hence, we plug in both the initial pressure and volume and final volume in order to calculate the final pressure:

\(P_2=\frac{2805mL*4.00atm}{3864mL}\\ \\P_2=2.90atm\)

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A polymer of ten monomers contains nine bonds between monomers, we need nine water molecules to break all of these bonds and completely hydrolyze the polymer.

The number of water molecules needed to hydrolyze a polymer of a different length will vary and will depend on the number of monomers in the polymer.To calculate the number of water molecules needed to completely hydrolyze a polymer that is ten monomers long, we need to consider that each hydrolysis reaction involves the addition of one water molecule to break the bond between each monomer.

Since a polymer of ten monomers contains nine bonds between monomers, we need nine water molecules to break all of these bonds and completely hydrolyze the polymer.

However, we must also consider that an additional water molecule is needed to break the bond between the final monomer and the rest of the polymer chain. Therefore, a total of ten water molecules are needed to completely hydrolyze a polymer that is ten monomers long.

It is important to note that the number of water molecules needed to hydrolyze a polymer of a different length will vary and will depend on the number of monomers in the polymer.

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Answer: The pressure in atmospheres is 0.674 in the container if the temperature remains constant.

Explanation:

Boyle's Law: This law states that pressure is inversely proportional to the volume of the gas at constant temperature and number of moles.

\(P\propto \frac{1}{V}\)     (At constant temperature and number of moles)

\(P_1V_1=P_2V_2\)  

where,

\(P_1\) = initial pressure of gas  = 205 kPa

\(P_2\) = final pressure of gas = ?

\(V_1\) = initial volume of gas  = 4.0 L

\(V_2\) = final volume of gas = 12000 ml = 12 L    (1L=1000ml)  

\(205\times 4.0=P_2\times 12\)  

\(P_2=68.3kPa=0.674atm\)        (1kPa=0.0098atm)

Therefore, the pressure in atmospheres is 0.674 in the container if the temperature remains constant.

Answer:

P2=68.33 mm Hg

Explanation:

P1V1=P2V2

PLUG IN

CONVERT mL TO L (12000mL=12L)

(205)(4)=(P2)(12)

DIVIDE BOTH SIDES BY 12

P2= 68.33 kPa

Answer:

4092 atoms of iron i am guessing

Explanation:

Answer:

mixture

Explanation:

Answer:

mixture

Explanation:

Answer:

No specific heat capacity and heat capacity are not equal

Answer:

Home

Home

Slower

Explanation:

A liquid starts changing its phase to gas when the two pressures become the same i.e., vapor and atmospheric.

At a higher altitude the atmospheric pressure lowers so little amount of heat is required for the vapor pressure of water to equalize with the atmospheric pressure at a higher altitude.

The pressure at the Rosa's home will be higher and lower in the campsite.

The boiling point will be higher at her home.

As the boiling point is lower in the campsite the water used in cooking noodles will evaporate faster this may lead to the noodles being under cooked. The water may evaporate before the noodles have cooked. So, the noodles will cook at a slower rate at the campsite and faster in her home.

A. The atmospheric pressure at Rosa's home is higher than her campsite.

B. The boiling point of water at Rosa's home is higher.

C. The noodles will be cooked faster at Rosa's home compared to at the campsite

A. The pressure has been the force that has been exerted by the molecules against each other, The higher altitude has lesser air molecules, which resulted in the lower pressure.

Since the pressure at 33 feet has been higher as than the pressure at 11,000 feet altitude, the atmospheric pressure at Rosa's home is higher than her campsite.

B. The boiling point has been the temperature at which liquids have been converted to gases. With the decrease in atmospheric pressure, there has been a lowering in the boiling point as well.

The atmospheric pressure at Rosa's home is higher compared to her campsite. Thus, the boiling point of water at Rosa's home is higher.

C. The lower atmospheric pressure at the campsite has been responsible for the lower boiling point of the temperature, This implies that water has converted to steam at lower temperatures. The lower temperature of water requires more time for the noodles to be cooked.

Thus, the noodles will be cooked faster at Rosa's home compared to at the campsite.

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Answer:

false

Explanation:

Answer:

false

Explanation:

The skin of grapes contains an antioxidant called resveratrol. Determine the resveratrol functional groupings. Alcohol makes comprises the compound's functional group.

An organic molecule known as an alcohol has at least one hydroxyl functional group attached to a saturated carbon atom. The major alcohol ethanol, which is used as a narcotic and is the main alcohol contained in alcoholic beverages, was the substance to which the term "alcohol" originally referred.

Resveratrol is a naturally occurring polyphenol that can be found in a variety of foods, including grapes, berries, peanuts, and several medicinal plants. It has a stilbene functional group in its molecular structure.

Thus, The skin of grapes contains an antioxidant called resveratrol. Determine the resveratrol functional groupings. Alcohol makes comprises the compound's functional group.

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Answer: the statement issues are addressed by the people working together is true about activation.

Explanation:

A bicarbonate ion is capable of combining with hydrogen ions to form a weak acid called carbonic acid because it is a Strong Base.

What is Acid Base concept ?

Accordiong to Acid Base concept , an acid is any hydrogen-containing substance that is capable of donating a proton (hydrogen ion) to another substance.

Accordiong to Acid Base concept, A base is a molecule or ion able to accept a hydrogen ion from an acid.

Acidic substances are usually identified by their sour taste.

Therefore, A bicarbonate ion is capable of combining with hydrogen ions to form a weak acid called carbonic acid because it is a Strong Base.

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Answer:

below on my bule

Explanation:bule

Answer:

The mass number is defined as the total number of protons and neutrons in an atom. Consider Table below which shows data from the first six elements of the periodic table. Consider the element helium. Its atomic number is 2, so it has two protons in its nucleus.

Explanation:

The rate of the forward and reverse reaction is equal is the property of a reaction that has reached equilibrium.

It is defined as the state of a system in which no net change in the concentration of the reactant and in the concentration of product occur. In chemical equilibrium forward and reverse reaction occurs at equal rates. All chemical reaction are not reversible.

The rate of the forward reaction and reverse reaction are equal in equilibrium.  

Reactant  ⇄  Product

Thus, from the above conclusion we can say that the The rate of the forward and reverse reaction is equal is the property of a reaction that has reached equilibrium.

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According to molar concentration, 0.576 liters of a 1.3 M solution can be made using 0.75 mole of CuCO₃.

Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.

The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.

Substitution gives, volume= 0.75/1.3= 0.576 liters.

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Answer: True

Explanation: As tectonic plates slowly move away from each other, heat from the mantle's convection currents makes the crust more plastic and less dense.

Answer: 6

Explanation: none needed lol

The correct statement if an acetic acid aqueous solution contains 22% by mass acetic acid is 100 gr of this solution contains 22 g of acetic acid (D).

Аn аqueous solution is а homogeneous mixture in which liquid wаter is аcting аs the solvent. We usuаlly consider the dissolved substаnces (solutes) to be solids, but vаrious liquids cаn аlso dissolve аs solutes in liquid wаter. The resulting solution still hаs а uniform composition. If аll components of the solution аre liquids, then you cаn describe the concentrаtion of eаch solute аs а volume percent vаlue.

А 22% by mаss аcetic аcid аqueous solution meаns thаt 22 g of аcetic аcid аre present in every 100 g of the solution. Thus, for every 100 grаms of аcetic аcid аqueous solution, 22 grаms of аcetic аcid аre present. This cаn аlso be written аs "22 g of аcetic аcid per 100 g of the solution".

Your question is incomplete, but most probably your options were

A. 1 L of this solution has a mass of 22 g

B. 1 mL of this solution contains 22 g of acetic acid

C. The density of this solution is 2.2 g/mL

D. 100 gr of this solution contains 22 g of acetic acid

E. 1 L  of this solution contains 22 ml of acetic acid

Thus, the correct option is D.

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Answer:

Explanation:

Dinitrogen pentaoxide is a nitrogen oxide.

...

3.1Computed Properties.

Property Name Property Value Reference

Formal Charge 0 Computed by PubChem

Answer:

Molecularity is the number of ions or molecules that take part in the rate determining step

Order of reaction is the number of molecules of reactant whose concentration changes during the chemical change

The correct electronic configuration or orbital diagram for titanium is [Ar] 3d² 4s²; the correct option is D.

The element titanium is a transition metal that has the atomic number 22.

The atomic number of 22 means that there are 22 electrons in the electron shell of titanium.

The electronic configuration of titanium is [Ar] 3d² 4s²

Titanium is used for several purposes such as

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Answer:No there needs to be fewer red on the reactant side.

Explanation:

Answer:

101.98 L

Explanation:

Ideal Gas Law    PV = n R T          R = gas constant = .082057 L-atm/mol-K

6.35 (V) = 4 * .082057 * 1973  

  V = 101.98 L