Find the midpoint of the line segment with the given endpoints
(-3, 3), (4, 10)

Answer:

I believe its a single replacement reaction

Answer:

1.36 Myr or 717 kyr.

Explanation:

Answer:

Half life of quartzs means natural decay of radioactive material.

Explanation:

Answer:

The solution formed is acidic

pH = 0.87

Explanation:

The acid-base reaction of NaOH with HCl is:

NaOH + HCl → NaCl + H₂O

Where 1 mole of NaOH reacts with 1 mole of HCl

In the problem, moles of NaOH and HCl are:

NaOH: 0.0250L × (0.525mol / L) = 0.013125 moles NaOH

HCl: 0.0750 × (0.355mol / L) = 0.026625 moles HCl

As moles of HCl > moles NaOH, HCl is in excess and the solution formed is acidic

Moles in excess of HCl are:

0.026625 moles - 0.013125 moles = 0.0135 moles HCl

As the volume of the solutions is 25.0mL + 75.0mL = 100.0mL = 0.100L, molarity of HCl after reaction is:

0.0135 moles HCl / 0.100L = 0.135M HCl = 0.135M H⁺

As pH is defined as - log [H⁺], pH of the solution is:

pH = -log 0.135M H⁺ = 0.87

pH = 0.87

The pH of the resulting solution of the acid and base mixture is; Acidic with a PH = 0.87

We are given;

Volume of NaOH = 25 mL = 0.025 L

Volume of HCl = 75 mL = 0.075 L

Concentration of NaOH = 0.525 M

Concentration of HCl = 0.355 M

Total volume of solution = 0.025 + 0.075 = 0.1 L

Now, the the equation of the reaction is;

HCl + NaOH = NaCl + H2O

We can see that 1 mole of HCl reacts with 1 mole of NaOH.

Since; number of moles = Volume × concentration

Number of moles of HCl = 0.075 × 0.355

Number of moles of HCl = 0.026625 moles

Similarly;

Number of moles of NaOH = 0.025 × 0.525

Number of moles of NaOH = 0.013125 moles

We can see that the number of moles of HCl is greater than that of NaOH and as such there is excess HCl acid in the mix.

Thus,

Excess moles of HCl acid = 0.026625 - 0.013125

Excess moles of HCl acid = 0.0135 moles

Concentration of this excess HCl is gotten by the formula;

M = Excess moles/total volume

M = 0.0135/0.1

M = 0.135 M

PH of this excess concentration is;

PH = -log [H+]

PH = -log [0.135]

PH = 0.87

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Grasslands are areas where the vegetation is dominated by grasses (Poaceae). However, sedge (Cyperaceae) and rush (Juncaceae) can also be found along with variable proportions of legumes, like clover, and other herbs. Grasslands occur naturally on all continents except Antarctica and are found in most ecoregions of the Earth. Furthermore, grasslands are one of the largest biomes on earth and dominate the landscape worldwide.[1] They cover 31-43% of the Earth's land area. There are different types of grasslands: natural grasslands, semi-natural grasslands, and agricultural grasslands.[1]

Answer:

Grasslands are areas where the vegetation is dominated by grasses (Poaceae). However, sedge (Cyperaceae) and rush (Juncaceae) can also be found along with variable proportions of legumes, like clover, and other herbs. Grasslands occur naturally on all continents except Antarctica and are found in most ecoregions of the Earth.

Explanation:

Answer:

Bicarbonate is naturally produced by the reaction of carbon dioxide (CO2) with water. (H2O) to produce carbonic acid (H2CO3), which dissociates to a bicarbonate ion and a. proton (H. + ).

Answer:

C) Increases the pressure

Explanation:

Increasing the pressure might result in the change of temperature of the substance, which would change its state of matter.

Answer:

b. a chemical reaction, in order for a substance to change its medium of state of matter it needs to go through a change in chemical balance or a chemical reaction

Explanation:

legit just learned this too

Answer:

5SiO2 + 2CaC2 --> 5Si + 2CaO + 4CO2

4NH3 + 5O2 --> 4NO + 6H2O

Mass of Cu₂CO₃ = moles × molar mass

                           = 8.35 mol × 187.1 g/mol

                           =  1562.29 g

166.87 g of aluminum chloride are created when 34 g of aluminum and 39 g of chlorine gas are combined.

One mole of aluminum and three moles of chlorine combine to generate the ionic compound aluminum chloride.

Al + 3Cl → AlCl3

This reaction results in the formation of AlCl3 from one mole of Al and three moles of Cl. Here, Al serves as the limiting reactant. So the product's mass is solely dependent on Al.

Al has an atomic mass of 27 g/mol.

133.5 g/mol for AlCl3.

Al has a given mass of 34 g. Therefore, there are 1.25 moles instead of 34 moles because of the ratio of 27 to 34.

Thus, 1.25 moles of aluminum produce 1.25 moles of aluminum chloride from 1 mole of aluminum.

1.25 mole of AlCl3 weighs 1.25 mol and 133.5 g/mol =  166.87 g.

As a result, the reaction produced 166.87 g of AlCl3.

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Answer:

by determining or looking up the electron configurations of the main group elements.

Explanation:

The valence electrons participate in chemical reactions. ... You can also find the core and valence electrons by determining or looking up the electron configurations of the main group elements.

Answer:

[Au] = 0.171 M

Explanation:

For this question, we assume the rock is 100 % gold.

First of all, we determine the moles of gold

67.3 g . 1mol/ 196.97g = 0.342 moles

Molar concentration is defined as the moles of solute, contained in 1L of solution.

Our solution volume is 2L.

M = 0.342 mol / 2L = 0.171

Molar concentration, also called molarity of solution is the most typical unit of concentration.

Answer:

Typhoons

Explanation:

A tropical cyclone is a word that is used by meteorologists to explain a rotating, organized system of clouds & thunderstorms that take their origins over tropical or subtropical waters and also possess closed but low-level circulation.

Now, In the Northwest part of the Pacific ocean, these tropical cyclones which are west of the dateline are referred to as Typhoons while In the southwest Pacific and in the Indian Ocean they are called Cyclones. Lastly, those that form over the Atlantic Ocean or eastern Pacific Ocean are referred to as hurricanes

Based on the given emission spectrum, we can deduce that the hypothetical atom with a single electron has three energy levels. Diagrams that satisfy the condition that the atom has three energy levels corresponding to the wavelengths of the emitted photons are:

1) The first diagram has energy levels of -0.5 eV, -1.13 eV, and -1.77 eV, respectively.

2) The second diagram has energy levels of -0.5 eV, -0.87 eV, and -1.15 eV, respectively.

The energy difference between these levels corresponds to the wavelengths of the emitted photons, as per the relationship E = hc/λ, where E is energy, h is Planck's constant, c is the speed of light, and λ is wavelength.

Two possible energy-level diagrams that could represent the structure of this atom are as follows:

1) The first diagram has energy levels of -0.5 eV, -1.13 eV, and -1.77 eV, respectively. These energy levels correspond to the wavelengths of the emitted photons: 248 nm, 413 nm, and 620 nm. The transitions between these levels are indicated by arrows, and the energy of the emitted photons is shown in eV. This diagram implies that the atom has a ground state and two excited states.

2) The second diagram has energy levels of -0.5 eV, -0.87 eV, and -1.15 eV, respectively. These energy levels also correspond to the wavelengths of the emitted photons: 248 nm, 413 nm, and 620 nm. The transitions between these levels are indicated by arrows, and the energy of the emitted photons is shown in eV. This diagram implies that the atom has a ground state and two metastable states.

Both of these diagrams satisfy the condition that the atom has three energy levels corresponding to the wavelengths of the emitted photons, and are therefore consistent with the given emission spectrum.

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Answer:

It will double

Explanation:

Given;

From the ideal gas equation;

PV = nRT

P=nRT/V

where;

P = pressure of the gas

n= number of moles of the gas

V= volume of the gas

R = the gas constant

T= absolute temperature of the gas

If V is halved when n and T remain the same

P2 = nRT/V/2

P2 = nRT * 2/V

P2 = 2nRT/V

Hence the pressure is doubled.

Answer:

A) It will double

Explanation:

...

Answer:

A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.

The total ionic equations shows the equation in which all the species of the reactants and the products are in dissociated form and are represented as ions.

The net ionic equations shows the equation in which all the species of the reactants and the products are in dissociated form and do not show the spectator ions which are same in the reactants and the products.

a) zinc nitrate + calcium sulphide \(\rightarrow \) zinc sulphide + calcium nitrate

balance equation : \(Zn(NO_3)_2(aq)+CaS(aq)\rightarrow ZnS(s)+Ca(NO_3)_2(aq)\)

total ionic equation :

\(Zn^{2+}(aq)+2NO_3^-(aq)+Ca^{2+}(aq)+S^{2-}(aq)\rightarrow ZnS(s)+Ca^{2+}(aq)+2NO_3^-(aq)\)

net ionic equation :

\(Zn^{2+}(aq)++S^{2-}(aq)\rightarrow ZnS(s)\)

b) potassium + calcium chloride  \(\rightarrow \) potassium chloride + calcium

balance equation : \(2K(s)+CaCl_2(aq)\rightarrow 2KCl(aq)+Ca(s)\)

total ionic equation :

\(2K(s)+Ca^{2+}(aq)+2Cl^-(aq)\rightarrow 2K^+(aq)+2Cl^-(aq)+Ca\)

net ionic equation: \(2K(s)+Ca^{2+}(aq)+\rightarrow 2K^+(aq)++Ca\)

Having control groups makes your research internal validity more certain.

The treatment group should be the only variable that varies between the two groups in an experiment. This guarantees that the complete effect of the treatment may be accurately measured without the variables being confounded.

The control group is the group that does not receive any therapy, a regular treatment, or a bogus treatment that can be used to control a placebo.The control group consists of participants who do not receive the experimental therapy. During an experiment, these people are randomly assigned to this group. They also bear a striking resemblance to people who participate in the trial or those who receive the treatment.

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If the pH of a solution is decreased from 9 to 8, it means that the concentration of hydrogen ions (H+) has increased.

pH is a measure of the acidity or basicity of a solution and is defined as the negative logarithm (base 10) of the concentration of hydrogen ions (H+). A decrease in pH indicates an increase in the concentration of hydrogen ions.

As the pH decreases from 9 to 8, the solution becomes more acidic because the concentration of hydrogen ions increases. This is because the pH scale is logarithmic, meaning that each unit change in pH corresponds to a tenfold change in the concentration of hydrogen ions. Therefore, a decrease in pH by one unit signifies a tenfold increase in the concentration of hydrogen ions.

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When the pH of a solution is decreased from 9 to 8, it means that the concentration of hydrogen ions (H+) has increased.

When the pH of a solution is decreased from 9 to 8, it means that the concentration of hydrogen ions (H+) has increased.

The pH scale is a logarithmic scale that measures the concentration of hydrogen ions in a solution. As the pH decreases by one unit, the concentration of hydrogen ions increases tenfold. So, when the pH decreases from 9 to 8, it means that the concentration of hydrogen ions has increased by 10 times.

Therefore, a decrease in pH from 9 to 8 indicates an increase in the concentration of hydrogen ions in the solution.

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The statements that correctly describe organometallic reagents are:

a) Organometallic reagents are good nucleophiles and strong bases.

c) Organometallic reagents are a source of electrophilic carbon.

d) These reagents contain a polar carbon-metal bond.

Statement b is incorrect as organometallic reagents are typically covalent rather than ionic, despite containing both metal and nonmetal atoms.

Compounds with at least one covalent bond between a carbon atom and a metal atom are known as organometallic reagents. These reagents are extremely reactive and flexible, with numerous applications in organic chemistry. One of the most important properties of organometallic reagents is their nucleophilic and basic nature, which allows them to be used in a wide range of processes.

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The values of all sub-parts have been obtained.

(a) The 6.04 amol/vescile of epinephrine are in each vesicle.

(b) The 3637892 molecules of epinephrine are in each vesicle.

(c) The volume of a spherical vesicle is V = 3.34 × 10⁻¹⁷ L.

(d) The concentration of epinephrine = 0.30 M.

What is molar concentration.

A chemical species' concentration, specifically the amount of a solute per unit volume of solution, is measured by its molar concentration. The number of moles per litre, denoted by the unit sign mol/L or mol/dm3 in SI units, is the most often used molarity unit in chemistry.

(a) Evaluate that how many attomoles (amol) of epinephrine are in each vesicle?

As given,

1 fmol = 10⁻¹⁵ mol

1 amol = 10⁻¹⁸ mol

Number of attomoles epinephrine:

= 151 fmol × (10⁻¹⁵ mol)/ 1 fmol × 1amol/10⁻¹⁸ mol

= 151000 amol

Number of attomoles of epinephrine in each vescile:

= 151000 amol/2.5 × 10⁴ vescile

= 6.04 amol/vescile.

(b) Evaluate that how many molecules of epinephrine are in each vesicle?

Number of molecules present in 1 mol of epinephrine:

     = 6.04/vescile × [(10⁻¹⁵ mol)/ 1 fmol] × [6.023 × 10²³ molecules/1 mol]

     = 3637892

(c) Evaluate the volume of a spherical vesicle of radius 200 nm.

Radius of spherical vescile is 2.00 × 10⁻⁷ m

Volume of the spherical vescile is,

V = 4/3 πr³

Substitute value of r respectively,

V = 4/3 π(2.00 × 10⁻⁷ )³

V = 3.34 × 10⁻²⁰ m³

V = 3.34 × 10⁻¹⁷ L

(d) Evaluate the molar concentration of epinephrine in the vesicle if it contains 10 amol of epinephrine.

Number of moles epinephrine = 10 amol

= 1.00 × 10⁻¹⁷mol

Volume of the spherical vescile = 3.34 × 10⁻¹⁷ L

Concentration of epinephrine = (1.00 × 10⁻¹⁷mol)/(3.34 × 10⁻¹⁷ L)

Concentration of epinephrine = 0.30 M

Hence, the values of all sub-parts have been obtained.

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This unit is explained as the work of a driving force of a newton whose point of application moves one meter in the direction of the force

1. The work done by the gas is 425,565 Joules

2. The change in internal energy of the gas is 637,171 Joules

1. W = P (V2 - V1) difference of v1 and v2.

P = 1 atm = 101325 N/m^2

V2 = 16.2 m^3

V1 = 12 m^3

W = 101325(16.2 - 12) = 101325 × 4.2 = equal to 425,565 Joules

2. ∆U = Q - W

Q = 254 kcal = 254×4184 = 1,062,736 Joules

now, Q is equal to 1,062,736 joules

∆U = 1,062,736 - 425,565 = 637,171 Joules

So, U is equal to 637,171 joules.

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Answer:

time for sulphur dioxide to diffuse is 221.05 secs

The time for sulphur dioxide to diffuse is 108 sec.

Sulfur dioxide has a molecular weight of sixty-four and as a result, the square root is 8. since its inversely proportional, on the way to diffuse two times as fast, the rectangular root of the molecular weight should be 4, and subsequently the molecular weight might be 16. So the solution is methane (CH4).

The charge of diffusion for a gas is inversely proportional to the rectangular root of its molecular mass (Graham's law). The gasoline with the lowest molecular weight will effuse the fastest. The lightest, and consequently fastest, fuel is helium.

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Answer:

La clorofila capta la energía luminosa del sol. (verdadero) La fotosíntesis degrada las sustancias orgánicas que nesecitas las células(falso)

Explanation:

La clorofila es la encargada de dar el pigmento de color verde en las plantas y la que transforma la energia luminica en energia quimica, es por eso que es verdadera.

La fotosintesis NO degrada las sustancias organicas, sino que transforma un sustrato inorganico en una fuente energetica organica para las plantas.

Esto se debe por que las plantas o vegetales son autonomas, es decir que se autoabastecen energeticamente sin necesidad de ingerir alimentos como en el caso de los mamiferos.

The increased distance across the cell will result in an increase absorbance reading.

The concentration of \([Fescn]_2\) would be affected if the cuvette had a 1.5 cm path length rather than the 1.0 cm value used.Since the absorbance of a sample is proportional to the concentration of a sample (as described by the Beer-Lambert law), increasing the path length of the cuvette would result in a decrease in absorbance. This means that the concentration of the sample would be lower than if the 1 cm path length was used. In other words, the concentration of \([Fescn]_2\)would be lower if the cuvette had a 1.5 cm path length than if it had a 1.0 cm path length.

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Answer:

\(50ml=0,05l\\n_H_2SO_4=2.0,05=0,1mol\\mH_2SO_4=0,1.98=9,8g\)

Explanation:

Lichens or moss similar to the pioneer species, like grass, that colonize an abandoned field is lichens and moss can exist where there is no soil, while pioneer species, such as grass, need soil to grow

A moss is a simple plant and the lichen is the fungi and algae sandwich and mosses are multicellular organism with leaflets of photosynthetic cell and just as with trees, ferns and wildflowers and lichen are usually considered pioneer species because they are able to grow on bare surfaces like rock and a lichen is a producer that is actually composed of two different species a fungus and a algae and the alga photosynthesizes while the fungus absorbs nutrients from rock and hold water

And through their ability to adapt to living in extreme conditions and lichen can colonize substrates that are low in nutrients and are considered as true pioneer

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Answer:

Jamestown, Virginia

Explanation:

Answer:

jamstown

Explanation:

Yeast is a substance which contributes to beer brewing by producing ethanol during alcohol fermentation.

This a process in which  carbohydrate is converted into an acid or alcohol. A common fungus used by brewing companies in fermentation processes is referred to as Yeast.

It converts Sugar to the following products:

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Answer:

Explanation:

Mide 2mL de etanol, añadelo a un matraz aforado, pon agua hasta llegar a 100mL