if you know the answer to any of these pls help out I'll give brainiest. also a lot of points​

Answer:

(a) Cr3+ and Br- will form CrBr3 (chromium(III) bromide)

(b) Fe3+ and O2- will form Fe2O3 (iron(III) oxide)

(c) Hg22+ and CO32- will form Hg2CO3 (mercury(I) carbonate)

(d) Ca2+ and ClO3- will form Ca(ClO3)2 (calcium chlorate)

(e) NH4+ and PO43- will form (NH4)3PO4 (ammonium phosphate)

Explanation:

chatGPT

The chemical formulas for the compounds formed by the given pairs of ions are: (a) CrBr3, (b) Fe2O3, (c) Hg2(CO3)2, (d) Ca(ClO3)2, and (e) (NH4)3PO4.

(a) Cr3+ and Br- : In order to form a neutral compound, the charges of the ions must balance. The charge of Cr3+ is 3+ and the charge of Br- is 1-. To balance the charges, we need three Br- ions for every Cr3+ ion. Therefore, the chemical formula is CrBr3.

(b) Fe3+ and O2- : The charge of Fe3+ is 3+ and the charge of O2- is 2-. To balance the charges, we need two O2- ions for every Fe3+ ion. Therefore, the chemical formula is Fe2O3.

(c) Hg22+ and CO2- : The charge of Hg22+ is 2+ and the charge of CO2- is 2-. The charges are already balanced, so no extra ions are needed. Therefore, the chemical formula is Hg2(CO3)2.

(d) Ca2+ and ClO3- : The charge of Ca2+ is 2+ and the charge of ClO3- is 1-. To balance the charges, we need two ClO3- ions for every Ca2+ ion. Therefore, the chemical formula is Ca(ClO3)2.

(e) NH4+ and PO3- : The charge of NH4+ is 1+ and the charge of PO3- is 3-. To balance the charges, we need three NH4+ ions for every PO3- ion. Therefore, the chemical formula is (NH4)3PO4.

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Democritus proposed the idea that atoms were unique to the substance they were found .

Model of Bohr (1913)

Niels Bohr made Rutherford's model better. He demonstrated, using mathematical concepts, that electrons reside in energy levels or shells surrounding the nucleus. Due to the discovery of subatomic particles, the Dalton model has evolved over time.

Astonishing scientific advancements in fields like contemporary chemistry and nuclear energy resulted from the finding that all matter is composed of microscopic particles, which was made possible by the atomic theory.

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Answer:

The speed of the wave is

v  = ( 240 )  ( 3.0 )= 720.0 m/s

Explanation:

If  n is the frequency of the wave  λ  is the wavelength of the wave.  v is the speed of the wave,

the three quantities are related by  v = n  λ    

We have, n = 240 Hz λ = 3.0 m v =?

I Hope This Makes Sense

We can not use a salt bridge saturated with potassium chloride solution in an electro-chemical cell made from a Ag/Ag+ cathode and a Cu/Cu²+ anode because it will precipitate.

An electrochemical cell that uses a weak electrolyte and a salt bridge to connect oxidation as well as reduction half cells. A junction that joins the anodic with cathodic compartments of a cell and electrolytic solution is referred to as a salt bridge.

Because both chloride and potassium ions have very similar diffusion coefficients and minimise junction potential, the inactive minerals potassium chloride (KCl) frequently used. We can not use a salt bridge saturated with potassium chloride solution in an electro-chemical cell made from a Ag/Ag+ cathode and a Cu/Cu²+ anode because it will precipitate.

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Answer:

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Approximately 4.37 x 10^23 molecules of HCl would be required to form 34.52 g of MgCl₂.

To determine the number of molecules of HCl required to form 34.52 g of MgCl₂, we need to use the molar mass and stoichiometry of the balanced equation:

Mg(OH)₂(s) + 2 HCl(aq) → 2 H₂O(l) + MgCl₂(aq)

The molar mass of MgCl₂ is 95.21 g/mol.

First, we need to calculate the number of moles of MgCl₂ formed:

Moles of MgCl₂ = mass of MgCl₂ / molar mass of MgCl₂

Moles of MgCl₂ = 34.52 g / 95.21 g/mol

Moles of MgCl₂ = 0.363 mol

According to the balanced equation, the stoichiometric ratio between HCl and MgCl₂ is 2:1. Therefore, the moles of HCl required can be calculated as follows:

Moles of HCl = 2 * Moles of MgCl₂

Moles of HCl = 2 * 0.363 mol

Moles of HCl = 0.726 mol

To calculate the number of molecules, we need to use Avogadro's number, which is approximately 6.022 x 10^23 molecules/mol.

Number of molecules of HCl = Moles of HCl * Avogadro's number

Number of molecules of HCl = 0.726 mol * 6.022 x 10^23 molecules/mol

Number of molecules of HCl = 4.37 x 10^23 molecules

Therefore, approximately 4.37 x 10^23 molecules of HCl would be required to form 34.52 g of MgCl₂.

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3.09 g is the theoretical mass of AlBr₃(s) produced.

The following dimensional analysis setup could be used to determine the theoretical mass of AlBr₃(s) (molecular mass = 266.69 g/mol) produced based on reacting 84.2 g of a 0.005 mol/L solution of Br₂(l) (density=1019 g/L) with excess Al(s) as described in the following equation:

3Br₂(l) + 2Al(s) → 2AIBr₃(s)

The dimensional analysis setup to calculate the mass of AlBr₃(s) produced is as follows:

84.2 g Br₂ (l) × (1 L solution / 1019 g Br₂(l)) × (0.005 mol Br₂(l) / 1 L solution) × (2 mol AlBr₃(s) / 3 mol Br₂(l)) × (266.60 g AlBr₃(s) / 1 mol AlBr₃(s)) = 3.09 g AlBr₃(s)

Therefore, the theoretical mass of AlBr₃(s) produced is 3.09 g.

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Answer:

0.34 x 0.568 = [0.19312]

Explanation:

just multiply it

Answer: 0.19

Explanation: 0.34 x 0.568 = 0.19312. this answer does not have the correct amount of significant figures though, so you have to round. 0.568 has 3 significant figures, and 0.34 has 2 significant figures. you always want to round to the smaller amount of significant figures, which is two in this case. 0.19312 rounds down to 0.19.

Answer:

A measure of an element's identity is determined by its atomic number, and its weight is determined by its atomic mass.

Explanation:

The amount of protons in the nucleus of an element's atom is known as the element's atomic number. It serves to identify and categorize the elements in the periodic table and is particular to each element. The chemical characteristics of an element are determined by its atomic number.

An element's atomic mass is its average atom's mass, which is typically expressed in atomic mass units (amu). It is the total number of protons and neutrons in the nucleus of an atom. The atomic mass can be a decimal and is not always a  number.

A measure of an element's identity is determined by its atomic number, and its weight is determined by its atomic mass.

A rainbow is produced through a proces that includes refraction, reflection, and dispersion of  sunlight.

A rainbow is formed when sulinght is refracted and reflected by rain drops in the atmospher.

The sunlight is split into its component colors, which is why rainbows appear as having an array of colors. This is due to each color being bent by a different amount during refraction.

The colors of a rainbow are always in the same order, with red on the outside and violet on the inside.

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We have that According to the law of conservation of mass,the Oxygen gas was produced

\(x=113.5grams\)

From the Question we are told that

145.3 grams of Magnesium Oxide (MgO) decomposes

Produces 32 grams Magnesium (Mg)

The law of conservation of mass states that Mass can not be destroyed nor created in a chemical reaction

Therefore

\(145.3=32+X\)

\(x=113.5grams\)

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The carbons and hydrogens in the structure are represented by the lines.

When lines are used to depict the structure of hydrocarbons, the carbons and hydrogens are represented by the lines themselves. Each line represents a chemical bond, with two lines indicating a double bond and three lines indicating a triple bond.

The carbons are usually represented by the intersections of lines, while the hydrogens are represented by lines extending from the carbons.

For example, in a simple hydrocarbon like methane (CH4), the carbon would be represented by a point or intersection of lines, with four lines extending from it, each representing a bond to a hydrogen atom.

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The properties of a natural resource that make it useful for humans as a material or energy source is the ability to convert mass into energy and vice versa.

The expression natural resources make reference to all types of matter and energy extracted from nature that can be used to produce goods and services.

Some examples of natural resources include for example irreversible resources such as fossil fuels (i.e., oil, or coal, gas, minerals such as metals, rocks, etc) as well as those based on the use of reversible energy such as eolic air energy, solar radiation or sunlight, soil and hydric resources or water.

Therefore, with this data, we can see that natural resources can be defined as any material and or energy obtained from nature that may be irreversible or reversibly used to produce goods and services.

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Answer:

The correct answer is - A. It is the fastest way to reproduce.

Explanation:

Asexual reproduction is the mode of reproduction that does not alter the genes or genetic matter in the offspring and also does not involve the fusion of gametes.

It does not include the genetic variation as it is similar to the parent genetic or sequences. The fastest way to reproduce is asexual reproduction. There is no direct relation between the stability of the environment the asexual reproduction.

Answer:

A. It is the fastest way to reproduce.

Explanation:

well it's only for AP3X users.

Answer and explanation

we are given the reaction equation between ammonia and oxygen to produce nitrogen gas and water.

firstly we balance the reaction as follows:

4NH₃(g) + 3O₂(g) → 2N₂(g) + 6H₂O(g)

now that we have a balanced chemical equation, we can see that 4 moles of ammonia react with 3 moles of oxygen in the balanced reaction.

therefore, 0.23 moles of ammonia will react with:

3/4 x 0.23 = 0.17 moles of oxygen

if we have 0.55 moles of oxygen reacting we can determine how many gram of water will be produced as follows;

from the balanced chemical reaction we see that we have 3 moles of oxygen reacting to form 6 moles of water.

therefore, the number of moles of water that will be produced from 0.55 moles of oxygen will be ;

6/3 x 0.55 = 1.1 moles of water will be formed.

now that we have the moles of oxygen, we can determine the mass of water produced using the following equation

mass = n x M

where n is moles

M is Molar mass of water

mass = 1.1 moles x 18.00 g/mol

= 19.8 grams of water will be produced

c. to determine the moles of nitrogen that will be produced when 12.6 grams of ammonia react can be determined by first calculating the number of moles of ammonia using the following equation

moles = mass (g) / Molar mass (g/mol)

moles = 12.6 g / 17.031 g/mol

= 0.74 moles of ammonia

we know from the balance reaction equation that 4 moles of ammonia produce 2 moles of nitrogen gas

therefore, the number of moles of nitrogen that will be formed will be

2/4 x 0.74

= 0.37 moles of nitrogen gas

Answer:

pH = 5.76

Explanation:

We can solve this problem by using Henderson-Hasselbach's equation:

pH = pKa + log\(\frac{[SodiumAcetate]}{[AceticAcid]}\)

We are already know all the required information, thus we input the data given by the problem:

pH = 4.76 + log(20/2)

And finally calculate the pH:

pH = 5.76

The pH of that acetic acid solution is 5.76.

Large-scale convection currents create divergent plate boundaries in science.

This refers to vertical motion organized on a larger scale than atmospheric free convection, it is associated with cumulus clouds. Examples of large-scale convection currents patterns of vertical motion is hurricanes or migratory cyclones.

Large convection currents in the aesthenosphere send heat to the surface, where plumes of less dense magma break apart the plates at the spreading centers, giving rise to divergent plate boundaries.

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Answer:

what e said

Explanation:

Answer:

It takes two electrons to make a covalent bond, one from each bonding atom. Lewis dot structures are one way to represent how atoms form covalent bonds. A table of Lewis dot symbols of nonmetal elements that form covalent bonds is shown in Fig. 2.28 Dots are placed around the symbol of the element to represent the number of valence electrons in the element. There can be up to eight dots, for eight valence electrons. The first four electrons are placed as single electrons, then the remaining four are paired.

Answer:

Explanation:

Dear student, this question appears to be incomplete but in the diagram attached below, I have carefully drawn out the required organic structure.

The aim of this question is to show the mechanism of the given structure and to point out the resonance structure.

The first diagram shows the complete part (i.e. the structure of the organic compound) and its major product(answer).

The second diagram shows the mechanism by which we arrived at the major product.

From the second diagram attached below, the -oxo substituent of the methanol attacks the hydrogen atom as shown below, leading to the formation of the enolate ion (a resonance stabilized anion).

However, this is because the alpha carbon attaches to the hydrogens readily leaves as H⁺ to yield an enolate ion as a result of -C- that is doubly bonded to oxygen (an Electron withdrawing group).

Kindly check out the images attached below to see the mechanism.

A faraday is equal to one mole of electric charge. Because each aluminum ion gains 3 electrons, 0.1 faraday of charge will reduce 0.1/3 moles of aluminum, or 0.033 moles of aluminum.

What is meant by aluminum ?

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The partial pressure of nitrogen on Venus is approximately 321.914 kPa.

To find the partial pressure of nitrogen on Venus, we need to calculate the partial pressure using the mole fraction of nitrogen and the total atmospheric pressure. First, we convert the total atmospheric pressure from psi to kilopascals (kPa) since the mole fraction is given in terms of kPa.

1 psi = 6.89476 kPa

Therefore, the total atmospheric pressure on Venus is:

1334 psi × 6.89476 kPa/psi = 9197.53 kPa

Next, we can calculate the partial pressure of nitrogen using the mole fraction. The mole fraction of nitrogen is given as 0.035, which means that nitrogen makes up 3.5% of the total moles of gas in the atmosphere.

The partial pressure of nitrogen is given by:

Partial pressure of nitrogen = Mole fraction of nitrogen × Total atmospheric pressure

Partial pressure of nitrogen = 0.035 × 9197.53 kPa

Partial pressure of nitrogen = 321.914 kPa

Therefore, the partial pressure of nitrogen on Venus is approximately 321.914 kPa.

It's important to note that the given atmospheric composition of Venus's atmosphere and the total atmospheric pressure are approximate values and can vary depending on specific conditions and measurements.

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Answer:

125

Explanation:

The equilibrium constant Kp for this reaction is 1.03×10^(-5) atm.

What is equilibrium constant?

The equilibrium constant, represented by K, is a quantitative measurement of the extent to which a chemical reaction has reached equilibrium. It describes the ratio of the concentrations (or partial pressures) of the products and reactants at equilibrium, with each concentration raised to a power equal to its coefficient in the balanced chemical equation.

We can use the relationship between Kp and Kc to solve this problem:

Kp = Kc(RT)^(Δn)

where R is the gas constant, T is the temperature in Kelvin, and Δn is the change in the number of moles of gas between the products and the reactants.

First, let's find Δn:

Δn = (moles of gas in products) - (moles of gas in reactants)

Δn = (2 moles) - (3 moles)

Δn = -1

Next, we can plug in the values and solve:

Kp = Kc(RT)^(-1)

Kp = (2.1)((0.0821 L·atm/mol·K)(295 K))^(-1)

Kp = 1.03×10^(-5) atm

Therefore, the equilibrium constant Kp for this reaction is 1.03×10^(-5) atm.

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Answer:

The atomic number increases across a period and down the group or family. The atomic mass generally increases with atomic number with a few exceptions.

Answer:

3.7mL is the volume of the object

Explanation:

To convert the mass of any object to volume we must use density that is defined as the ratio between mass of the object and the space that is occupying. For an object that weighs 7.9g and the density is 2.28g/mL, the volume is:

7.9g * (1mL / 2.28mL) =

To determine the partial pressure of chloroform vapor, we can use Raoult's law. According to Raoult's law, a component's partial pressure in a solution is equal to its vapor pressure.

What does Raoult's law entail?

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