Mass = 35g
Density = 5 g/cm3
∙What is the Volume?

Answer:

The main cause of global convection currents is the uneven heating of the earth by the sun. Hope this helped! :)

The main cause of global convection current is differential heating, that is the temperature difference in different levels of  atmosphere.

Convection current  is the heat transfer by fluid movement in the earth crust between different temperature regions. The density of fluids differs due to the temperature gradients and thus heated fluids raises and cooled fluid sinks.

The heated fluid movement causes the movement of plates of earth. The molten rock deep inside the earth crust circulates by the convection current.

Hence, the main cause of global convection current is the differential heating of the atmosphere.

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Answer:

If there is a change in the natural shape of the intestines, this can be known as a twisted bowel. A twist in the small intestine is referred to as a volvulus. Twists in the large intestine are known as a colonic volvulus. These abnormal twists or loops can cause an obstruction or other medical conditions which could be fatal. If signs of twisting bowel present, it is important to seek medical attention as quickly as possible.

Answer:

a. pH = 2.22.

b. [H+] = 2.588 x 10⁻⁴ mol/L.

Explanation:

Acids and Bases => Calculating pH of Acids and Bases.

As we saw before, the formulas to find the pH based on the hydrogen ion concentration [H+], and to find the hydrogen ion concentration [H+] based on the pH are the following, respectively:

So let's see each case:

a. To find the pH of an H+ concentration of 6.02 x 10⁻³ mol/L we use the pH formula:

The answer would be that the pH is 2.22.

b. To find the H+ concentration of a pH of 3.587, we use the [H+] formula:

The answer would be that the hydrogen ion concentration [H+] = 2.588 x 10⁻⁴ mol/L.

According to the research, the correct option is remove. An air-to-air heat pump removes heat from the outside air and deposits it in the conditioned space.

It is characterized by being a thermal machine or a device based on thermodynamics that, through an absorption process, takes heat from one place and transfers it to another, that is, it extracts heat from a cold source to a hot one.

An air-to-air heat pump starts by sucking in outside air or recovers heat from outside and transfers it to a higher temperature level in the ambient air, raising the temperature of the room, being adjustable to adapt to the heating needs of  the conditioned space.

Therefore, we can conclude that according to the research, the correct option is remove. An air-to-air heat pump removes heat from the outside air and deposits it in the conditioned space..

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To prepare the pH 4.00 buffer solution, you should mix approximately 61.35 mL of the 0.100 M benzoic acid solution with 38.65 mL of the 0.240 M sodium benzoate solution.The ratio of benzoic acid to sodium benzoate in the buffer solution using the Henderson-Hasselbalch equation.

To prepare a pH 4.00 buffer solution using benzoic acid and sodium benzoate, we need to calculate the appropriate volumes of the 0.100 M benzoic acid and 0.240 M sodium benzoate solutions.

First, we need to determine the ratio of benzoic acid to sodium benzoate in the buffer solution. The Henderson-Hasselbalch equation can help us with this calculation:

pH = pKa + log([A-]/[HA])

Given that the pH is 4.00 and pKa is 4.20, we can rearrange the equation:

log([A-]/[HA]) = pH - pKa

log([A-]/[HA]) = 4.00 - 4.20

log([A-]/[HA]) = -0.20

Next, we take the antilog of -0.20 to find the ratio of [A-] to [HA]:

[A-]/[HA] = antilog(-0.20)

[A-]/[HA] = 0.63

The ratio of [A-] to [HA] is 0.63.

Now, let's calculate the volumes of each solution needed. Let's assume x represents the volume (in mL) of the 0.100 M benzoic acid solution and y represents the volume (in mL) of the 0.240 M sodium benzoate solution.

Since the total volume is 100.0 mL, we have the equation: x + y = 100

Considering the ratio of [A-] to [HA] as 0.63, we can write the equation: y/x = 0.63

Solving these two equations simultaneously will give us the volumes of each solution:

x + y = 100

y/x = 0.63

By substituting y = 0.63x from the second equation into the first equation, we get:

x + 0.63x = 100

1.63x = 100

x = 61.35 mL (rounded to two decimal places)

Substituting this value back into the equation x + y = 100, we find:

61.35 + y = 100

y = 38.65 mL (rounded to two decimal places)

Therefore, to prepare the pH 4.00 buffer solution, you should mix approximately 61.35 mL of the 0.100 M benzoic acid solution with 38.65 mL of the 0.240 M sodium benzoate solution.

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The mass (in grams) of aluminum hydroxide produced when 4.46 g of sodium hydroxide reacts is 2.90 grams

First, we shall obtain the balanced equation for the reaction. This is given below

3NaOH + Al → 3Na + Al(OH)₃

From the balanced equation above,

120 g of NaOH reacted to produce 78 g Al(OH)₃

With the above information, we shall determine the mass of Al(OH)₃ produced from 4.46 grams of NaOH. Details below:

From the balanced equation above,

120 g of NaOH reacted to produce 78 g Al(OH)₃

Therefore,

4.46 g of NaOH will react to produce = (4.46 × 78) / 120 = 2.90 g of Al(OH)₃

Thus, the mass of aluminum hydroxide, Al(OH)₃ produced is 2.90 g

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Answer:

2CO + O2 = 2CO2

Explanation:

espero que esto ayude

Answer:

\(\large \boxed{\text{3. Na}}\)

Explanation:

We can use oxidation numbers to decide which substance is reduced.  

\(\rm 2\stackrel{\hbox{0}}{\hbox{Na}} + 2\stackrel{\hbox{+1}}{\hbox{ H}_{2}}\stackrel{\hbox{-2}}{\hbox{O}}\longrightarrow \rm 2\stackrel{\hbox{+1}}{\hbox{Na}^{+}} + 2\stackrel{\hbox{-2}}{\hbox{O}}\stackrel{\hbox{+1}}{\hbox{H}^{-}} + \stackrel{\hbox{0}}{\hbox{H}_{2}}\)

The oxidation number of Na changes from 0 in Na to +1 in Na⁺.

The oxidation number of H changes from +1 in H₂O to 0 in H₂.

\(\text{An increase in oxidation number is oxidation, so $\large \boxed{\textbf{Na}}$ is the substance oxidized.}\)

1 and 4 are wrong because H₂ and Na⁺ are products.

2. is wrong because there is no H⁺ to be oxidized or reduced.

Answer:

Radio waves are a type of electromagnetic radiation best-known for their use in communication technologies, such as television, mobile phones and radios.

Explanation:

soil pollution

composting

air pollution

gas absorbtion

water pollution

settling

Explanation:

solute is the substance being dissolved so that is the 2 tablespoons of lemonade and the 2 cups of water is the solvent.

Answer:

Fluorine    

Chlorine

Bromine

Iodine

Boiling point increases as you go down the group v11

Explanation:

The elements of Group VII  are the halogens consisting of f fluorine (F), chlorine (Cl), bromine (Br), iodine (I).  All of which are non metals and exists  as diatomic molecules - F2, Cl2, Br2, I2 with  intermolecular attractions between the two molecules of each element held by Van der Waals dispersion force.

Moving down the group, the size of the atoms increases in size from Fluorine, F2 and Chlorine, Cl2 which are gases to Bromine , Br2 which exists as a liquid to solid, Iodine, I2. This attributes to the increasing in Strength of the Van der Waals forces as you go down the group. In order to break the vanderwaals forces , More heat energy is required to change thier states  leading to the increase in  boiling point going down the group.

Fluorine    

Chlorine

Bromine

Iodine

Boiling point increases as you go down the group

Effective nuclear charge is really important, because it determines the size and energy of orbitals, which determine most properties of atoms.

Other trends that are important in understanding effective nuclear charge on the periodic table, or z effective trend, are atomic radius, atomic number, and ionization energy. Atomic radius generally increases down a group and decreases across a period.

Effective nuclear charge, Zeff, is a representation of the average electrical field experienced by a single electron. It is the average environmental created by the nucleus and the other e- in the molecule, expressed as a net positive charge at the nucleus.

There are two factors responsible for increasing the effective nuclear charge, which is electrons and protons. The effective nuclear charge, Zeff=Z−S. this value gives information about the charge of an electron.

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Answer: pretty sure its 0.214 moles * 40.3g/mole = 8.6g (2 sig figs) of MgO, and

0.035 moles * 40.3g/mole = 1.4g of MgO

Explanation:

Answer:

\(\boxed{\boxed {\sf 23.0 \ g \ Ba(NO_3)_2}}\)

Explanation:

We are asked to find the mass of 5.30 ×10²² formula units of barium nitrate.

First, we convert formula units to moles using Avogadro's Number or 6.022×10²³. This is the number of particles (atoms, molecules, formula units, etc.) in 1 mole of a substance. In this case, the particles are formula units of barium nitrate.

Set up a conversion factor using Avogadro's Number.

\(\frac{6.022 \times 10^{23} \ formula \ units \ Ba(NO_3)_2}{ 1 \ mol \ Ba (NO_3)_2}\)

We are converting 5.30×10²² formula units, so we multiply by this value.

\(5.30 \times 10^{22} \ formula \ units \ Ba(NO_3)_2 *\frac{6.022 \times 10^{23} \ formula \ units \ Ba(NO_3)_2}{ 1 \ mol \ Ba (NO_3)_2}\)

Flip the conversion factor so the units of formula units of barium nitrate cancel.

\(5.30 \times 10^{22} \ formula \ units \ Ba(NO_3)_2 *\frac{ 1 \ mol \ Ba (NO_3)_2}{6.022 \times 10^{23} \ formula \ units \ Ba(NO_3)_2}\)

\(5.30 \times 10^{22} *\frac{ 1 \ mol \ Ba (NO_3)_2}{6.022 \times 10^{23}}\)

\(\frac{5.30 \times 10^{22} }{6.022 \times 10^{23}} \ mol \ Ba(NO_3)_2\)

\(0.0880106276984 \ mol \ Ba(NO_3)_2\)

Next, convert moles to grams using the molar mass. The molar mass of barium nitrate is 261.35 grams per mole.

Set up a conversion factor using the molar mass.

\(\frac{ 261.35 \ g \ Ba(NO_3)_2} {1 \ mol \ Ba(NO_3)_2}\)

Multiply by the number of moles we calculated.

\(0.0880106276984 \ mol \ Ba(NO_3)_2 *\frac{ 261.35 \ g \ Ba(NO_3)_2} {1 \ mol \ Ba(NO_3)_2}\)

The units of moles of barium nitrate cancel.

\(0.0880106276984*\frac{ 261.35 \ g \ Ba(NO_3)_2} {1}\)

\(23.001577549 \ g \ Ba(NO_3)_2\)

If this is rounded to the tenths place, the 0 in the hundredth place tells us to leave the 0 in the tenths place.

\(23.0 \ g \ Ba(NO_3)_2\)

The mass of 5.30 ×10²² formula units of barium nitrate is approximately 23.0 grams.

If the catalyst is added to a system at equilibrium then the reaction follows an alternative pathway of lower activation energy.

Any substance that speeds up a reaction without consuming it first. The catalysts for numerous crucial metabolic events are naturally occurring substances called enzymes.

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Answer: 45

Explanation:

mass number = number of protons and neutrons

atomic number = number of protons

to find neutrons subtract atomic number from mass number

so 80 - 35 = 45 neutrons

The smallest particle of a compound that still has the compound's properties is called a Molecule.

A molecule is a collection of two or more atoms held together by the attractive forces known as chemical bonds. When speaking of polyatomic ions, the distinction between them and ions is frequently ignored in the fields of quantum physics, organic chemistry, and biochemistry. A molecule can be heteronuclear, which is a chemical compound made up of more than one element, such as water, or homonuclear, which is a molecule made up of atoms of one chemical element, such as the two atoms in the oxygen molecule (O2) (two hydrogen atoms and one oxygen atom; H2O). The term "molecule" is frequently used to refer to any gaseous particle, regardless of its composition, in the kinetic theory of gases.As the noble gases are single atoms, the requirement that a molecule comprise two or more atoms is relaxed. Often, single molecules do not include atoms and complexes joined by non-covalent interactions like hydrogen bonds or ionic bonds.

There are lots of molecules in matter. Most of the oceans and atmosphere are also made up of them. The majority of organic compounds are molecules. Molecules such as proteins, the amino acids that make them up, nucleic acids (DNA and RNA), sugars, carbohydrates, lipids, and vitamins are examples of the constituents of life. The nutrition minerals, such as iron sulphate, are often ionic compounds rather than molecules.

On Earth, however, the vast majority of known solids are composed entirely or mostly of molecules-free crystals or ionic compounds. All the minerals that make up the Earth's composition, as well as sand, clay, pebbles, rocks, boulders, bedrock, the molten interior, and the Earth's core, are among them. Each of these has several chemical linkages, but are not made of identifiable molecules.

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Answer:

1/32

Explanation:

The heat of fusion of the solid that melts is 500 J/g.

When we talk about the heat of fusion then our mind must go to the heat that does not raise the temperature of the object but would cause the solid to be able to melt and we can be able to also put down the formula;

H = mL

m = mass of the solid

L = heat of fusion

H = heat supplied

Then we have;

4000 = 8 L

L = 4000/8

L = 500 J/g

Thus the heat of the fusion of the solid material here is 500 J/g

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Answer:  5.43x10^23 g/mole M&M's

Explanation:

1 bag of M&M's = 1.75oz       (1.75oz)*(453.6g/16oz) = 49.61 g

1 bag = 55 M&M's

(49.61 g)/55 M&M = 0.9021 g/MM

1 mole M&M's = 6.023x10^23 M&M's

(6.023x10^23 M&M's)*(0.9021 g/MM's) = 5.43x10^23 g/mole  molar mass

Answer:

In West Africa, garri refers to the creamy granular flour obtained by processing the starchy tuberous roots of freshly harvested cassava. ... Flour foodstuffs mixed with cold or boiled water are a major part of the diet amongst the various ethnicities of Nigeria, Benin Republic, Togo, Ghana, Guinea, Cameroon and Liberia.

Explanation:

The diffusion of water through a selectively permeable membrane is called osmosis.

Osmosis is the movement of water molecules from an area of high concentration to an area of low concentration through a selectively permeable membrane.

A selectively permeable membrane allows some molecules to pass through while blocking others. In the case of osmosis, the membrane allows water molecules to pass through but blocks solute molecules. The movement of water molecules occurs because of the difference in the concentration of solute molecules on either side of the membrane.

The side with a higher concentration of solute molecules attracts water molecules from the other side, causing a net movement of water molecules towards that side until equilibrium is reached. Osmosis is a crucial process for living cells as it helps regulate the balance of water and solutes in the cell.

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Answer:

Explanation:

It is to keep the mixture homogeneous

The aim is to produce a homogenous mixture.

Examples of homogenous mixtures are as follows:

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Enantioselective are reactions that generate products that are enriched in one enantiomer.

Enantiomers are pairs of molecules that exist in two forms that are mirror images of each other but are not superimposable. The enantiomers are chemically identical in all other respects. Enantiomeric pairs are distinguished by the direction in which they rotate polarized light when dissolved in solution, either dextrorotatory (d or +) or levorotatory (l or -). Hence the term optical isomer.

The enantioselectivity of a chromatography system is defined as the preferential interaction of one enantiomer with a chiral selector. It is usually determined as the ratio of the retention factors of the two enantiomers in a chiral chromatography or electrophoresis system.

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O2 can only be ionized by light with a maximum wavelength of 99.39 nm.

The ionization energy measures an element's ability to participate in chemical processes that call for the creation of ions or the donation of electrons.

ionization energy of O2 = 1205 kJ

energy = hv

= h × wavelength/speed of light

wavelength = 1205000× 3 ×10⁸ /6.626 ×10³⁴

wavelength = 99.39 nm.

He is symbolized by the highest ionization energy. The outermost shell has a high ionization energy, is stable, and does not frequently become unstable due to electron loss. Ionization can be induced by waves with energies greater than 134 nm. 225nm light lacks the energy to ionize gold because it is greater than 134nm.

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According to chemical equilibrium,the rate law of the given chemical reaction is rate=K[W]³.

Chemical equilibrium is defined as the condition which arises during the course of a reversible chemical reaction with no net change in amount of reactants and products.A reversible chemical reaction is the one wherein the products as soon as they are formed react together to produce back the reactants.

At equilibrium, the two opposing reactions which take place take place at equal rates and there is no net change in amount of the substances which are involved in the chemical reaction.At equilibrium, the reaction is considered to be complete . Conditions which are required for equilibrium are given by quantitative formulation.

Factors which affect chemical equilibrium are change in concentration , change in pressure and temperature and presence of catalyst.As second step s slow step the rate law comes from this step where K=[product]\(^moles\)=[W]³ and concentration of X does not matter as it is present in excess.

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