from which elements lanthanide series start​

Answer:

12 and 20 moles ratios, respectively.

Explanation:

Note that the number of mole ratios you can write for a chemical reaction involving a total of n substances is (n)(n–1). Thus, for reactions involving four and five substances, you can write 12 and 20 moles ratios, respectively.

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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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The symbol that represents a solution in a chemical reaction is "(aq)."

In chemistry, "(aq)" stands for "aqueous," which refers to a solution where the solute is dissolved in water. A solution is a homogeneous mixture composed of a solvent (in this case, water) and a solute (the substance being dissolved).

When a chemical species is in an aqueous solution, it means that it is dissolved and uniformly dispersed in water molecules. The "(aq)" symbol is typically used to indicate this state of the substance in a chemical equation or reaction.

For example, consider the equation:

NaCl(aq) + AgNO₃(aq) → AgCl(s) + NaNO₃(aq)

In this equation, NaCl(aq) and AgNO₃(aq) both represent substances that are dissolved in water. The "(aq)" notation indicates that these substances are in the form of an aqueous solution.

On the other hand, the symbols "(l)," "(s)," and "(g)" represent different states of matter. "(l)" represents a liquid, "(s)" represents a solid, and "(g)" represents a gas.

So, to summarize, the symbol "(aq)" is used to indicate that a substance is in the form of an aqueous solution, specifically dissolved in water, in a chemical reaction.

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The 10 reactions of glycolysis can be categorized as follows:

(a) Phosphorylations:

Glucose + ATP → Glucose-6-phosphate + ADP

Fructose-6-phosphate + ATP → Fructose-1,6-bisphosphate + ADP

2-phosphoglycerate + 2 ADP → 2 ATP + 2-phosphoenolpyruvate

(b) Isomerizations:

2. Glucose-6-phosphate → Fructose-6-phosphate

Dihydroxyacetone phosphate → Glyceraldehyde-3-phosphate

(c) Oxidation-Reductions:

6. Glyceraldehyde-3-phosphate + NAD+ + Pi → 1,3-Bisphosphoglycerate + NADH + H+

(d) Dehydrations:

4. Fructose-1,6-bisphosphate → Glyceraldehyde-3-phosphate + Dihydroxyacetone phosphate

(e) Carbon-Carbon Cleavages:

8. 2-phosphoenolpyruvate + H2O → Pyruvate + Pi

Enolase: 2-phosphoglycerate → Phosphoenolpyruvate + H2O

Pyruvate kinase: Phosphoenolpyruvate + ADP → Pyruvate + ATP

Therefore, 3 reactions are phosphorylations, 2 are isomerizations, 1 is an oxidation-reduction, 1 is a dehydration, and 3 are carbon-carbon cleavages. These reactions ultimately result in the conversion of glucose to two molecules of pyruvate, generating a small amount of ATP and reducing equivalents in the process.

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The molecular structures of sugars and alcohols are similar due to the presence of the -OH group.

This is a substance which has a sweet taste and is a form of simple carbohydrate.

They are however not similar due to the different numbers of Carbon atoms attached to the -OH group..

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Answer:

Explanation:

The net ionic equation is essentially the most simplified version of a reaction with only the reactants that form the precipitate (the solid). Due to this it is extremely important to properly write your ionic equation first. In your total ionic equation, you forgot to balance the compounds with 2- charges.  The coefficients in your equation is due to the 2- charge of sulfate and 2+  charge of Strontium. Additionally, precipitates are solid which means they do not dissociate. SrSO4 will stay together while KBR which are both spectator ions will dissociate leaving you with the ionic equation below.

Total Ionic Equation: Sr^2 (aq)+  + 2Br ^1- (aq) +2K ^ 1(aq) +  SO4 ^2- (aq) --> SrSO4 (s) + 2K^1+ (aq) + 2Br^1- (aq)

The coefficient of 2 on both K and Br in the products is to ensure that the equation is balanced and that for your net ionic equation, all spectator ions cancel. When you cancel all of the ions that dissociate you are left with the essence of the reaction:

Net Ionic Equation:  Sr^2 (aq) + SO4 ^2- (aq) --> SrSO4 (s)

The missing product in a chemical reaction can be due to various reasons such as incomplete reaction, loss of product during isolation, errors in measurements, impurities in reactants or products, and side reactions.

Percent yield is a measure of the efficiency of a chemical reaction. It compares the actual yield of a reaction to the theoretical yield that could be obtained if the reaction went to completion. A percent yield of 90% means that 90% of the expected amount of product was obtained. The remaining 10% is the "missing" product.

The missing product can be due to several reasons. One possibility is that the reaction was incomplete, meaning that not all of the reactants were converted to products. This could happen if the reaction conditions were not optimal, such as if the temperature or pressure was not high enough or if the reaction time was too short.

Another possibility is that some of the product was lost during isolation, such as if it was stuck to the reaction vessel or if it evaporated. Errors in measurements can also contribute to the missing product, such as if the reactants were not accurately weighed or measured. Impurities in the reactants or products can interfere with the reaction, leading to a lower yield.

Finally, side reactions can also occur, where the reactants form other products instead of the desired product. This can happen if the reactants are not pure or if the reaction conditions are not optimal. Overall, identifying the reason for the missing product requires careful analysis of the reaction conditions and the experimental procedure.

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Answer:

433 m

Explanation:

Since the fall represents motion under gravity, we use the equation

s = ut - 1/2gt² where s = height of cliff or distance bowling ball falls through, u = initial velocity of bowling ball = 0 m/s(since it starts from rest), t = time = 9.4 s and g = acceleration due to gravity = -9.8 m/s².

So, substituting the values of the variables into the equation, we have

s = 0 m/s × 9.4 s - 1/2 × 9.8 m/s² × (9.4 s)²

s = 0 m - 1/2 × -9.8 m/s² × 88.36 s²

s = 1/2(865.928 m)

s = 432.964

s ≅ 433 m

1,2-dichloroethane is a better solvent for this extraction than water due to its non-polarity and ability to dissolve nonpolar compounds.

The choice of solvent for an extraction process depends on the nature of the substances involved. In this case, if the compound being extracted is nonpolar, using a nonpolar solvent like 1,2-dichloroethane would be advantageous. Water, on the other hand, is a polar solvent.

To further support this claim, we can look at the solubility parameters of 1,2-dichloroethane and water. The solubility parameter measures the compatibility between solvents and solutes. The solubility parameter of 1,2-dichloroethane is around 9.2 (cal/cm^3)^0.5, while water has a solubility parameter of around 23.1 (cal/cm^3)^0.5. The lower solubility parameter of 1,2-dichloroethane suggests better solubility for nonpolar compounds compared to water.

In summary, 1,2-dichloroethane is a better solvent for this extraction than water due to its non-polarity and better solubility for nonpolar compounds. The choice of solvent should be based on the nature of the substances involved, and in this case, a nonpolar solvent is more suitable.

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Answer:the atoms of a solid aluminium can are close together vibrating in a rigid structure if the can is warmed up on a hot plate

Explanation:

The attraction of a metallic cation for delocalized electrons is known as "metallic bonding".

This type of bonding occurs when the valence electrons of the metal atoms become delocalized and form a "sea of electrons" that all the metal cations are able to move around in. This movement of electrons allows the metal cations to have electrostatic interactions with each other, leading to strong bonding.

The attraction of a metallic cation for delocalized electrons is known as metallic bonding.Metallic bonding refers to the bonding between metallic atoms. The valence electrons of the metallic atoms, in this case, are free to move throughout the entire crystal, creating a “sea” of electrons.

The positively charged metallic ions are then held together by this sea of electrons. The attraction between the positively charged metal ions and the negatively charged electron sea is known as metallic bonding.In metallic bonding, the valence electrons are delocalized and shared between many atoms, resulting in strong bonds.

These electrons are free to move throughout the metal lattice, resulting in high electrical and thermal conductivity as well as malleability and ductility. Metals also have high melting and boiling points, which is also a result of the strong metallic bonds between the atoms.

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Answer:

It is a heterogeneous mixture

Receive digital payments faster and deposit them directly into your bank much faster than paying with cash or a check.

P2P payments send money from one person to another in a matter of seconds. Money is usually delivered to the recipient within 1-3 days. Many platforms give recipients instant access to funds for a small fee. P2P payments are payments made directly to another person using a P2P payment service.

P2P payments allow users to send money quickly while keeping their account details private. All you need to send a payment is the recipient's email address or phone number. P2P payment providers like let you send and receive money instantly. You can pay without cash, so you can trade even if you forgot your wallet at home. Most P2P payments are free to use.

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The most likely cause of earthquakes that occur in the area shown on the map is due to fault lines in the earth's crust.

Earthquakes are natural phenomena characterized by the shaking or trembling of the Earth's surface.

They occur due to the sudden release of energy in the Earth's crust along fault lines, which creates seismic waves that propagate through the Earth.

The Earth's crust is composed of several large tectonic plates that float on the semi-fluid layer of the Earth's mantle.

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The increase in the atomic number increases the frequency and spectral lines in the spectrum. The addition of the number of electrons and energy increases the lines of the emission spectrum.

Spectrum has been defined as the light colors emitted by the atom of varying frequencies and wavelengths. The electron has been known to travel from lower to higher energy levels. This leads to the emission of light.

According to the principal quantum number, the addition of the electrons increases the energy and in turn, increases the lines of spectrum emission.

Therefore, the atom number directly relates to the spectrum line.

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Yes...Time is an illusion because, if you really think about it, the only things that exist are Space and Velocity. This goes to say that everything in the universe is moving. However, the by product of movement in space is a third and illusory phenomena (quantum) we call Time.

Time is a prime conflict between relativity and quantum mechanics, which is measured. To many physicists, while we experience time as psychologically real, time is not fundamentally real.

Illusion simply means an instance of a wrong or misinterpreted perception of a sensory experience.

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1) Allowed

2) Not allowed

3) Not allowed

4) Not allowed

5) Not allowed

6) Not allowed

7) Allowed

8) Allowed

9) Allowed

10) Not allowed

Atomic orbitals are filled with electrons according to the Aufbau principle and Hund's rule, following the electron configuration of the elements in the periodic table.

The Aufbau principle states that electrons fill orbitals in increasing energy levels starting from the lowest energy level. Hund's rule states that electrons occupy orbitals of equal energy singly before pairing up with another electron of opposite spin. The electron configuration is determined by the number of protons in the nucleus, which is the atomic number of the element. The electron configuration determines the electron arrangement in the atom and its chemical properties.

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Li+ has a smaller ionic radius than K+

and smaller molecules have more collisions/interactions between each other

In the case of ion-solvent interactions, the state in which the interac-tions exist is an obvious one; it is the situation in which ions are inside the solvent.

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your nama nskdbksmabsbs

The oxidation state of an atom in a molecule is a measure of the charge it would have if the bonds in the molecule were 100% ionic. To determine the oxidation state of an atom, you can use the following rules:

The atom is a basic unit of matter, consisting of an atomic nucleus and a cloud of negatively charged electrons that surrounds it. The atomic nucleus consists of positively charged protons and neutrally charged neutrons (except in the atomic nucleus of Hydrogen-1, which has no neutrons).

The electrons in an atom are bound to the nucleus by electromagnetic forces. A collection of such atoms can also bond with each other, and form a molecule. Atoms containing the same number of protons and electrons are neutral, while those containing a different number of protons and electrons are positive or negative and are called ions. Atoms are grouped based on the number of protons and neutrons contained in the atomic nucleus. The number of protons in an atom determines the chemical element of that atom, and the number of neutrons determines the isotope of that element.

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Therefore the initial pressure of the system is 670 torr.

The heavy and very rare gas known as xenon (Xe) is a member of the periodic table's Group 18 (noble gases).The first noble gas discovered to really create chemical compounds was this one. Xenon is a gas that is more than 4.5 times heavier than air and has no flavour or smell. The face-centered cubic crystal structure that solid xenon belongs to implies that its molecules, which are made up of a single atom, behave like spheres packed as closely as possible. The Greek word xenos, which means "foreign" or "strange," is where the name xenon comes from.

Xenon is not used extensively in industry. It is utilised in ultraviolet light-producing high-pressure arc lamps, stroboscopic lamps, high-intensity arc-lamps for motion picture projection, and photographic flash lamps (solar simulators).

Boyle's Law P₁V₁ = P₂V₂. Substitute and rearrange to solve for P₁

The initial pressure of the system is P₁ = 500 torr (13.4 Lit)/ 10.0 Lit = 670 torr

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The neutral organic product obtained from the reaction is propene (CH3CH=CH2)

The given reaction involves the dehydration of 1-propanol (CH3CH2CH2OH) in the presence of concentrated sulfuric acid (H2SO4) at 200°C. Dehydration is the removal of a water molecule from the alcohol compound. In this case, 1-propanol loses a water molecule to form propene (CH3CH=CH2), which is an alkene.

The neutral organic product resulting from this reaction is propene (CH3CH=CH2). The reaction occurs as the hydroxyl group (-OH) of 1-propanol is protonated by the acidic H2SO4, leading to the loss of a water molecule. This creates a double bond (C=C) between the second and third carbon atoms, resulting in the formation of propene.

Thus, the neutral organic product obtained from the reaction is propene (CH3CH=CH2).

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Explanation:

H2S is the limiting reagent

H2S= 1/8 (least value)

O2= 1/4

Answer:

Na₂₆F₁₁

Explanation:

We find the moles of the substance assuming 100 g of the substance is present. Why do we take 100 g? Because then the percent of sodium/fluorine, would be the g of sodium/fluorine respectively:

74.186 g Sodium | 1 mol Sodium/23 g              =>       3.2255 mol Na    

25.814 g Fluorine | 1 mol Fluorine/19 g             =>       1.3586 mol F

Divide each by smallest number of moles:

3.2255/1.3586 = 2.37

1.3586/1.3586 = 1

Multiply by common number to get a smallest whole number:

2.37*11 = 26,

1*11 = 11

The empirical formula is Na₂₆F₁₁

0.0134 moles.

Explanation:

We will use conversion factors to solve this problem.

Potassium chloride has the chemical formula KCl.

1 gram of KCl is written on the left side of the conversion factor equation.

KCl has a molar mass of 74.5513 g/mol. This is found by adding together the atomic mass of each element. This means that 1 mole of KCl = 74.5513 grams

The conversion factor will look like this. To solve the equation we start with what is on the left, 1 gram. 1 is multiplied by the number in the numerator, and divided by the number in the denominator. When 1 is divided by 74.5513 it equals .0134. The unit grams cancel giving us our final answer in moles.

I hope this satisfied your request. Feel free to ask any questions. I apologize, my handwriting is a bit messy.

Here are the  answers to the questions:1. True2. True3. True4. True.

Determine whether the following statements are true or false.  electron sea exists in metallic bonds true ( )? or false ( )?

True

In a metallic bond, the valence electrons of the metal atoms form a "sea" of electrons, which surrounds the nuclei of the metal atoms.

The outer electrons of the atoms become delocalized and can flow through the crystal, linking the metal atoms in a lattice structure.

Thus, electron sea exists in metallic bonds.2. Binding energy in two-atom model is defined as the maximum potential energy that two atoms can have. true ( )? or false ( )?Answer: True.

The maximum potential energy that two atoms can have is defined as the binding energy in two-atom models.

Therefore, this statement is true.3. In two-atom mode, the behavior of the potential energy is similar to that of harmonic oscillator (spring motion) when the interatomic distance is near the equilibrium interatomic distance. true ( )? or false ( )?Answer: True.

The potential energy of a two-atom system varies with the interatomic distance. The behavior of potential energy is similar to that of harmonic oscillator (spring motion) when the interatomic distance is near the equilibrium interatomic distance. Therefore, this statement is true.4.

The most common chemical bonds for ceramic materials are covalent and metallic bonds, and these bonds make ceramic materials to be brittle. true ( )? or false ( )?Answer: True

Ceramic materials are brittle due to the types of chemical bonds they possess. Covalent and metallic bonds are the most common types of chemical bonds found in ceramic materials. These bonds make the materials hard, stiff, and brittle. Therefore, this statement is true.

So, the main answers to the questions are True, True, True, True.

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Explanation:

Density is a measure of mass per volume

which means we are

including our lungs