The anion radius is 0.072 nm. the cation has a charge of +2, the anion must have a charge of -2
The force of attraction between a divalent cation and an anion is proportional to the product of their charges and inversely proportional to the distance between them. The force can be expressed as F = k * q1 * q2 / r, where k is the Coulomb constant (8.99 x[tex]10^-9[/tex] N [tex]m^2/C^2[/tex]), q1 and q2 are the charges of the cation and anion, respectively, and r is the distance between the centers of the ions.
Since the cation has a charge of +2, the anion must have a charge of -2. Rearranging the equation and plugging in the known values, we can solve for the anion radius: r = sqrt(k * q1 * q2 / F) = sqrt(8.99 x [tex]10^9[/tex] N [tex]m^2/C^2[/tex] * 2 * 2 / (1.92 x [tex]10^-8[/tex] N)) = 0.072 nm.
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we can only do ideal calculations when we are at standard temperature and pressure. True or False
It is true that we can only perform ideal calculations under normal pressure and temperature.
Why do scientists utilize normal pressure and temperature?It is now simpler to compare various measures for gasses, such as the number of molecules of gas in a certain volume. For scientists to be able to compare different sets of data in a meaningful way, a global standard for temperature and pressure must be established.
What is the usual temperature and pressure?The nominal air temperature at sea level are referred to as STP, or normal temperature and pressure. The conditions are 0 °C and 1 atmosphere of pressure, respectively.
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According to the electron sea model, the melting points of metals are not as extreme as the boiling points. This is because the cations and electrons are - in a metal. It does not take much energy for a solid to become liquid. But metallic bonds are very - , so it does require a lot of energy to separate atoms from the cations in their sea of electrons.
According to the electron sea model, the melting points of metals are not as extreme as the boiling points. Therefore, the given statement is correct is true.
What is electron sea model?The Electron Sea Model's whole hypothesis relies around the behavior of atoms throughout this bonding. The movement of unpaired electrons between positively charged metal ions in a mesh is known as metallic bonding.
According to the electron sea model, the melting points of metals are not as extreme as the boiling points. This is because the cations and electrons are - in a metal. It does not take much energy for a solid to become liquid. But metallic bonds are very - , so it does require a lot of energy to separate atoms from the cations in their sea of electrons. This statement is true.
Therefore, the given statement is correct is true.
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how many liters of air with density 1.23 kg/m3 is needed to completely burn 350 g of propane (c3h8, mw 44.1)? [what are the reactants? write the chemical equation first.]
4396.5 L of air at the given density 1.23 kg/m3 is needed to completely burn 350 g of propane. The equation for the reaction is: [tex]C_{3}H_{8} + 5O_{2}[/tex] → [tex]3CO_{2} + 4H_{2}O[/tex].
How do you determine the volume of air required?The density given for air corresponds roughly to a temperature of 15 °C and 1 atm pressure.
Let us assume that 1 liter of air is 21% [tex]O_{2}[/tex],
We will need 4240 L of air at STP. The density of air at STP is 1.2754 kg/m³. Since the air given here is at a lower density, then we will need more air proportionate to the density, or 4396.5 L of air at the density that has been given.
How does volume compare to density?Volume is the three-dimensional area that a closed surface encloses. Mass per unit volume is density. Volume and density have a direct proportional relationship. In other words, if the volume changes, the density will change, and vice versa.
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the diels-alder reaction is one example of what type of reaction?
An example of an electrocyclic reaction is the Diels-Alder reaction. New σ-bonds, that are energetically higher stable than that of the π-bonds, are formed during this reaction.
The Diels-Alder Reaction: What is it?A conjugated diene & an alkene (dienophile) react to generate unsaturated six-membered rings in the Diels-Alder reaction. The reaction is also known as a "cycloaddition" because it results in the production of such a cyclic product through a cyclic transition state.
What is the primary outcome of the Diels-Alder process?Because it is created whenever the electron-withdrawing group of the dienophile are facing in the direction of the electrons of the diene, endo is typically the main result.
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the object is measured to have a density of 12.45 g/ml. what is the mass of a cube of this substance that measures 8.0 cm on each side?
The mass of the cube is approximately 6224.32 grams.
Density: Density (volumetric mass density or the specific mass) is the substance's mass per unit of volume. The symbol most often will be used for density is ρ Mathematically, ρ = m / V
The volume of a cube with side length 8.0 cm is 8.0 × 8.0 × 8.0 = 512 cm⁻³.
So, the mass of the cube can be calculated by multiplying the density (12.45 g/ml) by the volume (512 cm^3) and converting the volume to milliliters:
mass = density × volume
mass = 12.45 g/ml × (512 cm⁻³ / 1000 ml/cm⁻³)
mass = 6224.32 g
So the mass of the cube is approximately 6224.32 grams.
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What provides an acid or basic environment to optimize digestion?
In order to create a highly acidic environment, the stomach secretes hydrochloric acid (HCl), which lowers the pH of the stomach.
What is digestion?Food is broken down into more digestible, smaller pieces throughout the digestion process so that the body can absorb and use them.
The digestive system's secretions produce the acidic or basic environment necessary for effective digesting. In order to create a highly acidic environment, the stomach secretes hydrochloric acid (HCl), which lowers the pH of the stomach. Proteins are broken down, digestive enzymes are activated, and potentially hazardous microorganisms are killed in this acidic environment.
The small intestine, on the other hand, is kept at a pH that is somewhat basic to enhance the activity of the digestive enzymes that break down carbs, proteins, and lipids. The release of bicarbonate, a basic chemical, from the pancreas and the small intestinal wall maintains the basic environment of the organ.
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n element has four naturally occurring isotopes with the masses and natural abundances given here. isotopemass (amu) abundance (%) 189.9047052.93 290.9056511.54 391.9050417.65 493.9063217.88 find the atomic mass of the element. express your answer to four significant figures and include the appropriate units.
The atomic mass of the element is 291.0646 amu, rounded to four significant figures: 291.1 amu.
The atomic mass of an element is the weighted average of the masses of its isotopes, where the weight is the fractional abundance of each isotope. To calculate the atomic mass, we need to multiply each isotope mass by its fractional abundance and then add up these products.
The fractional abundances need to be expressed as decimals, so we divide each percentage abundance by 100
52.93% ÷ 100 = 0.5293
11.54% ÷ 100 = 0.1154
17.65% ÷ 100 = 0.1765
17.88% ÷ 100 = 0.1788
Next, we multiply each isotope mass by its fractional abundance:
189.9047052.93 x 0.5293 = 100.3625 amu
290.9056511.54 x 0.1154 = 33.7147 amu
391.9050417.65 x 0.1765 = 69.1759 amu
493.9063217.88 x 0.1788 = 87.9715 amu
Finally, we add up these products to get the atomic mass of the element:
100.3625 + 33.7147 + 69.1759 + 87.9715 = 291.0646 amu
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are the alkali metals highly reactive or non-reactive?
Alkali metals are extremely reactive, hence they are almost never encountered in nature in their elemental state instead appearing as ionic compounds.
Alkali metals are not reactive, so why?Lithium, sodium, potassium, and all other alkali metals have a single electron in their valence shell. This one electron has little attraction to the atom since it is most likely located far from the nucleus.
How reactive are alkali metals?One of the most reactive metals is alkali metal. They have greater atomic radii and low ionization energies, which contribute to this. They have an oxidation state of 1, and they frequently give electrons during reactions. These metals stand out for their supple texture and silvery hue.
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one year consists of 365 days. this is closest to how many seconds? (remember the following conversion factors: kilo (103), mega (106), giga (109), and tera 1012.)
One year consists of approximately 31,536,000 seconds. This can be calculated by multiplying the number of seconds in a minute (60)
The number of minutes in an hour (60), and the number of hours in a day (24) by the number of days in a year (365).
The number of seconds in a year can be calculated as follows:
Seconds in a year = Seconds in a minute x Minutes in an hour x Hours in a day x Days in a year
Seconds in a minute = 60
Minutes in an hour = 60
Hours in a day = 24
Days in a year = 365
Plugging in the values, we get:
Seconds in a year = 60 x 60 x 24 x 365 = 31,536,000
Therefore, one year consists of approximately 31,536,000 seconds.
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(a) in table 1.1 we see that 57 wt% of the listed pollutants are co. does it follow from that table that 57 percent of the air pollution problem in the united states is a co problem?
"No, 57% CO only reflects a portion of air pollutants, not overall air pollution."
The information presented in Table 1.1 only shows the weight percentage of carbon monoxide (CO) among the listed pollutants. It does not provide information about other sources of air pollution, such as particulate matter, sulfur dioxide, nitrogen oxides, and other pollutants. Therefore, it cannot be concluded from Table 1.1 that 57% of the air pollution problem in the United States is a CO problem. Further data and analysis would be required to determine the extent to which CO contributes to overall air pollution in the United States. The data in Table 1.1 provides important information, but it should be viewed in the context of a larger body of data and analysis to draw accurate conclusions about air pollution in the United States.
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You mix 1 mole of hno3 with 1 mole of naoh in enough water to make 1 l of solution. what do you expect the final ph of the solution to be?
HNO3 is nitric acid and NaOH is sodium hydroxide. HNO3 and NaOH will react to form sodium nitrate (NaNO3) and water. pH of the solution depend with the concentration of H+ ions present.
HNO3 + NaOH ⇒ NaNO3 + H2O
The reaction is exothermic and that means by progressing the reaction it will release heat and this heat will help increase the solubility of ions in the solution.
The pH of the solution depends upon the concentration oh H+ and OH- ions. if the pH is 7.0 the solution will be neutral, if the pH is below 7.0 it is acidic and above 7.0 it is alkaline.
If the solution is neutral, the concentration of H+ ions will be equal to the concentration of OH- ions.
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a 7.05 mass % aqueous solution of ethylene glycol (hoch2ch2oh) has a density of 1.07 g/ml. calculate the molarity of the solution.
The molarity (M) of an aqueous solution is defined as the number of moles of solute per liter of solution. The molarity of the 7.05 mass % aqueous solution of ethylene glycol is 0.12 M.
Calculation of Ethylene Glycol Molarity in Aqueous SolutionThe molarity of an aqueous solution refers to the number of moles of solute present in one liter of the solution. To determine the molarity of a 7.05 mass % aqueous solution of ethylene glycol (HOCH2CH2OH), the first step is to calculate the mass of ethylene glycol present in 100 g of the solution using the given mass percentage (7.05%). The volume of the solution can then be calculated using the density (1.07 g/ml). The number of moles of ethylene glycol present in the solution can be determined by dividing the mass of ethylene glycol by its molar mass (62.07 g/mol). Finally, the molarity of the solution is calculated by dividing the number of moles of ethylene glycol by the volume of the solution in liters. The result shows that the molarity of the 7.05 mass % aqueous solution of ethylene glycol is 0.12 M.
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how many moles of sodium are there in 4.51 moles of the following compounds? 1st attempt part 1 (0.3 point)see periodic table nacl moles of na part 2 (0.3 point) na2so4 moles of na part 3 (0.3 point) na3po4 moles of na part 4 (0.3 point)see hint nano3 moles of na
1. nacl:4.51,2.na2so4:9.02, 3.na3po4:13.53, 4.nan03:4.51 moles of na, moles of sodium are there in 4.51 moles of the following compounds
In 1 mole of NaCl, there are 1 mole of Na. In 1 mole of Na2SO4, there are 2 moles of Na. In 1 mole of Na3PO4, there are 3 moles of Na. In 1 mole of NaNO3, there are 1 mole of Na.
NaCl: 4.51 moles * 1 mole Na/1 mole NaCl = 4.51 moles of Na
Na2SO4: 4.51 moles * 2 moles Na/1 mole Na2SO4 = 9.02 moles of Na
Na3PO4: 4.51 moles * 3 moles Na/1 mole Na3PO4 = 13.53 moles of Na
NaNO3: 4.51 moles * 1 mole Na/1 mole NaNO3 = 4.51 moles of Na
The number of moles of solute that are dissolved in a specific volume is indicated by the concentration metric known as molarity (M). Applying the rule of three would be as follows: If there are 6.4 moles of NaCl in 1 litre of solution,
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f the concentration of a reactant doubles, and the rate of the reaction increases by a factor of 8, what is the reaction order with the respect to that reactant?
If the concentration of reactant is doubled the rate of reaction becomes :rate=k[A]2,rate1=k[2A]2=4rate,So, the reaction order is FOUR TIMES.
What factor does the response rate rise by when the amount of a doubles?When the concentration of The a doubles, the response rate also doubles; similarly, when the amount of A is multiplied by ten, the reaction rate multiplies by ten; and so on.
What happens when a chemical reaction's reactant concentration rises to equilibrium?At constant T and V, if the proportion of the a reaction species increases, the balance system will change so that the concentration of the that species decreases.The opposite impact will be seen if a reactive species' concentration is lowered.
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when hcl(aq) is added to the solution containing co(h2o)62 (aq) the color changed from pink to blue. when agno3(aq) is added to this solution, what color will the solution be?
The color change from blue to white is due to the fact that AgCl is an opaque solid that does not allow light to pass through, making the solution appear white.
When aqueous HCl is added to a solution containing cobalt(II) hydroxide [Co(H2O)6]2+, the pink color of the solution changes to blue because the reaction produces cobalt(II) chloride [CoCl2]2+ and water:
Co(H2O)6^2+ + 6 HCl ⇒ CoCl2^2+ + 6 H2O
When aqueous silver nitrate (AgNO3) is added to this solution, the cobalt(II) chloride will react with silver nitrate to form a precipitate of silver chloride (AgCl), which is white:
CoCl2^2+ + AgNO3 -> Co(NO3)2^2+ + AgCl (precipitate)
Therefore, the solution will turn white after the addition of AgNO3.
The reaction between cobalt(II) chloride [CoCl2]2+ and silver nitrate (AgNO3) is a classic example of a precipitation reaction. Precipitation reactions occur when two ionic compounds are mixed together and the positively charged cations and negatively charged anions combine to form an insoluble solid that separates from the solution. In this case, the cation is CoCl2^2+ and the anion is NO3^-, which combine to form AgCl, an insoluble solid. The reaction is a double replacement reaction, in which the cations and anions switch partners to form new compounds.
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for each solute, click the button under the better solvent. solute which is the better solvent? oohocchch2cohoh och3cch3
For this question, the better solvent for the solute OOHOCC H2COHOH is OCH3CCH3.
OOHOCC H2COHOH is a hydrocarbon, which means it is non-polar. Therefore, the only solvent that can dissolve this solute is another non-polar solvent, such as OCH3CCH3 (methane).
Non-polar solutes dissolve best in non-polar solvents. This is because the non-polar nature of the solute and solvent allows them to mix and form a homogeneous solution. Non-polar solutes include hydrocarbons, alcohols, ethers and alkanes. Polar solutes, on the other hand, dissolve best in polar solvents. Polar solutes include acids, bases, salts, sugars and amino acids.
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How many carbon atoms are in 2 moles of pentane, C5H12?a. About 6 x 10^23 carbon atoms b. About 5 x 10^23 carbon atoms c. About 6 x 10^24 carbon atoms d. About 1.2 x 10^23 carbon atoms
Option (d) About 1.2 x 10²³ carbon atoms. Pentane is a hydrocarbon with the formula C₅H₁₂, meaning it contains 5 carbon atoms.
To find the number of carbon atoms in 2 moles of pentane, we can multiply the number of moles by the number of carbon atoms per mole:
carbon atoms in 2 moles of pentane = 2 moles * 5 carbon atoms/mole
carbon atoms in 2 moles of pentane = 10 carbon atoms
So the answer is 10 carbon atoms, which is not one of the choices given. However, if we round 10 to the nearest power of 10, we get:
10 carbon atoms ≈ 10¹ carbon atoms
So the answer is approximately 10¹ carbon atoms, which is closest to the choice (d) About 1.2 x 10²³ carbon atoms.
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a 20.0-ml sample of 0.25 m hno3 is titrated with 0.15 m naoh. what is the ph of the solution after 30.0 ml of naoh have been added to the acid?
The pH of the solution after 30 ml of NaOH has been added to the acid is 2.00.
From the question, we are given this information:
Volume of HNO₃ = 20 ml = 0.020 lMolarity of HNO₃ = 0.25 MMolarity of NaOH = 0.15 MVolume of NaOH = 30 ml = 0.030 lFrom there, we can calculate the moles of each compound.
Moles of HNO₃ = 0.020 * 0.25 = 0.0050
Moles of NaOH = 0.030 * 0.15 = 0.0045
Calculate the moles of HNO₃ in excess
= 0.0050 - 0.0045
= 0.00050
The total volume of the solution is 0.02 L + 0.03 L = 0.050 L
The concentration of H+ = 0.00050 / 0.050
= 0.0100 M
After we figure out the molarity of the solution, we can find out the pH of the solution using a logarithm.
pH = - log (0.0100) = 2.00
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acetylene is a fuel used in weilding torches. calculate the heat released in the reaction for the combustion of acetylene
The heat of combustion of the acetylene is; -1253.3 kJ/mol
What is the heat of combustion of acetylene?The heat of combustion of acetylene (C2H2) is the amount of heat energy released when acetylene is burned in excess oxygen. The heat of combustion is a measure of the energy content of a substance and is usually expressed in units of energy per unit of substance, such as joules per mole (J/mol) or calories per gram (cal/g).
The heat of combustion is;
[2(-393.5) + (-241.6)] - [-226.7]
= -1253.3 kJ/mol
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during an exothermic chemical reaction, a solid is consumed and a gas produced. is this reaction spontaneous? group of answer choices yes no not enough information
Yes, a solid is consumed and a gas is created during an exothermic chemical process. Is this response unprompted?
An illustration of a spontaneous exothermic reactionExothermic reactions, such those caused by burning wood, fireworks, and the addition of alkali metals to water, comprise the majority of spontaneous chemical reactions. An exothermic nuclear reaction occurs spontaneously when a radioactive atom splits, releasing energy.
Is the response natural?The energy change, temperature, pressure, and entropies of the reactants and products are only a few of the variables that affect whether a chemical reaction is spontaneous or not. It is impossible to tell if the reaction is spontaneous or not from the information given in the question.
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prelab questionsin your own words, please state in one paragraph the purpose of this entire lab? q1) what are the units of measure for temperature, mass, volume, and length used by the si system, respectively? q2) what is the difference between a molar solution and a normal solution? q3) what are agar plates and how are they most commonly used in science?
Pre-Lab Activities: All pre- and post-lab assignments of laboratories will be presented on Canvas. You should finish all of the tasks with in Canvas Module, such as reading and viewing videos, to get ready for each lab.
What should you do four things before beginning a lab experiment?Identify four things to do before beginning a lab experiment. I Don the appropriate attire and safety gear (goggles, gloves, aprons). ii) Remove all books and clothing from the lab benches. iii) Wear fitted attire, and tie back your hair. iv) If you use contact lenses, let the teacher know in advance.
Why are lab exercises important?Through laboratory experiences, students' understanding of specific scientific concepts and facts, as well as how these facts and or concepts are ordered within the scientific disciplines, may be improved. building a rational argument for science.
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determine the number of atoms in 35.0 grams of calcium, ca. (the mass of one mole of calcium is 40.08 g.)
The number of atoms in 35.0 grams of calcium, ca. (the mass of one mole of calcium is 40.08 g) is 5.275*10^23 by avogardo's number
Avogadro's number is the number of particles in 1 mole (or mol) of a substance. These particles might be electrons, molecules, or even atoms.
How many atoms, molecules, or other components make up one mole of a substance is determined by Avogadro's Number. For instance, 6.022 x 1023 hydrogen atoms make up one mole of hydrogen.
The value of 6.023 x 1023 is equal to one mole of any substance (Avogadro's number) . It can be used to quantify the chemical reaction's byproducts. The symbol for the unit is mol.
35* [tex]\frac{1}{40.08}[/tex] = 0.873 mol ca
Using Avogadro's number, 6.022×10^23particles mol, we can calculate the number of atoms present:
0.873 * 6.022×10^23 = 5.275*10^23 no. of atoms
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how do the relative humidity measurements for the inside and outside location that you measured compare? why do you think your determinations are similar or different?
Because evaporation is considerably more rapid whenever the relative humidity is lower, even though the amount of moisture present in the atmosphere is the same inside as outside, the inside will be much drier.
Is high or low humidity preferable?Lower humidity can have major health repercussions, and the ideal range is between 40 or 60 percent. The combination of indoor heating in the winter and the chilly outside air can produce extremely dry indoor air. Numerous health issues are exacerbated by dry air: a skin condition known as eczema.
Is less humidity a good thing?Low humidity causes the mucus lining your respiratory tract to become inflamed and dry, as well as dry and itchy skin, dry eyes, and itchy, flaky skin. This significantly raises the risk of the common cold, the flu, and other illnesses.
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A competitive inhibitor of an enzyme-catalyzed reaction is called: _______-
Substrate analogues are competitive inhibitors of an enzyme-catalyzed process. Methotrexate, an antineoplastic medication, is an illustration of a competitive inhibitor.
Competitive inhibitor: what is it?When an inhibitor binds to the enzyme's active site, where the substrate would typically bind, the enzyme's activity is inhibited. The substrate and the inhibitor both share a similar structure.
Why are they referred to as "competitive inhibitors"?Competitive enzyme inhibitors compete with the substrate for the enzyme's active site by having a shape that is similar to the substrate molecule. As a result, enzyme-substrate complexes cannot form. As a result, the enzymes are able to attach to fewer substrate molecules, which slows down the reaction rate.
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what glassware item is meant to be used to move liquid in an accurate and precise manner.
A pipette is a piece of glassware that is designed to have to accurately and precisely transport liquid.
What is the best explanation of a liquid?A form of substance known as a liquid has characteristics that make this less stiff than that of a solid but far more rigid than that of a gas. Unlike a solid, which has a defined form, a liquid may flow. In contrast, a liquid takes on shape of the jar it is kept in.
What makes anything liquid?Liquids are just fluids. The particles in a liquid get a lot more flexibility to move about than those in a solid. In a liquid, the forces that hold the atoms that make up a solid are just momentary.
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explain the role and meaning of the van't hoff factor in determining the colligative properties of solutions containing ionic solutes.
The van't Hoff factor (i) is a factor used to account for the number of ions produced when a single unit of an ionic solute dissolves in a solvent. It is used to determine the colligative properties of solutions containing ionic solutes, such as freezing point depression, boiling point elevation, and osmotic pressure.
The van't Hoff factor takes into account the effect of dissociation on the concentration of particles in solution and is used to correct the apparent concentration of particles in the solution. The van't Hoff factor is equal to the number of ions produced per formula unit of the solute when it dissolves in water, and is usually greater than 1 for strong electrolytes. By using the van't Hoff factor, colligative properties can be accurately predicted for solutions containing ionic solutes.
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the lattice energy of lif is -1036 kj/mol. when 2.036 g of lif is dissolved in water, 0.371 kj of heat is absorbed. calculate the enthalpy of hydration of lif.
The enthalpy of hydration of LiF is 1040.76 kJ/mol. This value represents the amount of heat absorbed when 1 mole of LiF is dissolved in water.
The enthalpy of hydration of lithium fluoride (LiF) can be calculated as follows:
Convert the mass of LiF to moles:
2.036 g LiF / 25.9 g/mol = 0.078 moles LiF
Calculate the heat absorbed per mole of LiF:
0.371 kJ / 0.078 moles = 4.76 kJ/mol
Calculate the enthalpy of hydration by subtracting the lattice energy from the heat absorbed per mole:
Enthalpy of hydration = heat absorbed per mole - lattice energy
= 4.76 kJ/mol - (-1036 kJ/mol)
= 1040.76 kJ/mol
So, the enthalpy of hydration of LiF is 1040.76 kJ/mol. This value represents the amount of heat absorbed when 1 mole of LiF is dissolved in water.
The enthalpy of hydration, or the heat of solution, is a measure of the energy change that occurs when a substance is dissolved in a solvent. It is a measure of the amount of heat absorbed or released during the dissolution process.
When a solid substance is dissolved in a solvent, energy is required to break the attractive forces between the solid particles, allowing the particles to move freely in the solvent. This energy is called the lattice energy, which is the energy required to separate a solid into its constituent ions in the gas phase.
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recall the photo of the melting ice cubes. if you put the water from the melted ice cubes back in the freezer it will become solid again. describe the transfer of thermal energy as the ice cubes melt and then as they become solid again. in both situations, describe which substanes are gaining and losing energy.
Convection heat is one way to deliver the energy as heat. The cooler water underneath the ice will fall into the warmer water below it while it is floating on the water.
Ice warms up when heated, but once it begins to melt, the temperature remains constant until all of the ice has melted. This occurs as a result of all the convection heat energy being directed toward dissolving the ice's crystal lattice.
The transfer of heat between two bodies by currents of moving gas or fluid is known as convection heat transfer. In free convection, air or water rises and is replaced by a cooler parcel of air or water as it moves away from the hot body.
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Who were the first people to attempt to explain why chemical changes occur?A. metallurgistsB. the GreeksC. alchemistsD. physicistsE. physicians
C. Alchemists were the first people to attempt to explain why chemical changes occur.
Alchemists were a group of ancient philosophers and proto-scientists who lived from around the 1st to the 17th century. They aimed to transform base metals into gold and to discover the elixir of life that would grant immortality. Despite their ultimate failure to achieve these goals, alchemists made important contributions to the development of modern chemistry. They developed early ideas about elements and compounds, as well as methods for chemical experimentation. Alchemists also discovered many important substances, including mercury, zinc, and sulfuric acid. Their work laid the foundation for modern chemical science and paved the way for future scientific advancements.
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what type of atom is represented by the small brown sphere in the center of this silica tetrahedron?
Silicon is represented by small brown sphere in the center of this silica tetrahedron.
The silica tetrahedron that positions the support of all the silicate crystal is composed of silicon and oxygen. The mineral quartz SiO₂ is create in all types of rock and in all portions of the world.
Quarts falls into a group of minerals called the silicates, all of which comprise the elements silicon and oxygen in some amount. Silicates are by far the most shared minerals in earth’s crust and mantle creating up 95% of the crust and 97% of the mantle by most estimations.
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