The correct order in which organisms are formed is *
2 points
a. organ, system, tissue, organism, cell
b. cell, tissue, organs, system, organism
c. tissue, cell, organs, organism, system
d. organism, tissue, organs, system, cell

When the electron in a hydrogen atom transitions from n, light with a wavelength of 486 nm is released.

Radio waves, light waves, and infrared (thermal) waves are examples of electromagnetic radiation that produce distinctive patterns as they move across space. Each wave is unique in its length and shape. The wavelength is the separation between peaks (high points). Therefore, when the electron in a hydrogen atom transitions from n, light with a wavelength of 486 nm is released. Radio waves, light waves, and infrared (thermal) waves are examples of electromagnetic radiation that produce distinctive patterns as they move across space. Each wave is unique in its length and shape.

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Answer:

67.8%

Explanation:

La reacción de descomposición del CaCO₃ es:

CaCO₃ → CO₂ + CaO

Donde 1 mol de CaCO₃ al descomponerse produce 1 mol de CO₂ y 1 mol de CaO.

Usando la ley general de los gases, las moles de dioxido de carbono son:

PV = nRT.

Donde P es presión (1atm), V es volumen (20L), n son moles de gas, R es la constante de los gases (0.082atmL/molK) y T es temperatura absoluta (15 + 273.15 = 288.15K). Reemplazando los valores en la ecuación:

PV / RT = n

1atmₓ20L / 0.082atmL/molKₓ288.15K = 0.846 moles

Como 1 mol de CO₂ es producido desde 1 mol de CaCO₃, las moles iniciales de CaCO₃ son 0.846moles.

La masa molar de CaCO₃ es 100.087g/mol. Así, la masa de 0.846moles de CaCO₃ es:

0.846moles ₓ (100.087g / mol) = 84.7g de CaCO₃

Así, la pureza del marmol es:

(84.7g de CaCO₃ / 125g) ₓ 100 =

Answer:

Grams of chlorine gas to moles

The SI base unit for amount of substance is the mole. 1 grams Chlorine is equal to 0.028206357713029 mole.

Explanation:

0.006711 moles of metal should be plated in the given electroplating process.
To determine how many moles of metal should be plated in the given electroplating process, we need to use Faraday's law of electrolysis.


Faraday's law states that the amount of substance produced at an electrode during electrolysis is directly proportional to the amount of electrical charge passed through the cell. This can be expressed by the following equation:

mol of substance = (charge passed / Faraday's constant) x oxidation state of substance

where,
- charge passed is the electrical charge in Coulombs (C)
- Faraday's constant is the charge per mole of electrons (96485 C/mol)
- oxidation state is the charge on the metal being plated

Using the given values, we can plug them into the equation as follows:

mol of metal = (648.2 C / 96485 C/mol) x 3

mol of metal = 0.006711 mol

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(i) Tritium (3H) undergoes radioactive decay to produce helium-3 (3He) with a half-life of 12.32 years.

Using the radioactive decay law, we can calculate the amount of 3H that will decay into 3He over the given period:

t1/2 = 12.32 years

t = 1.5 years (from July 1, 1998, to Jan 1, 2000)

λ = ln(2) / t1/2 = 0.0562 year^-1

N(t) = N0 * e^(-λt)

where N(t) is the number of atoms at time t, N0 is the initial number of atoms, and e is the mathematical constant approximately equal to 2.718.

Plugging in the given values, we get:

N(1.5 years) = 10 Ci * (3.7 * 10^10 disintegrations/s/Ci) * (1 - e^(-λt)) = 2.76 * 10^19 atoms

To convert this into grams, we need to know the molar mass of 3He, which is 3.016 g/mol. Therefore, the mass of 3He produced will be:

m = N * M = 2.76 * 10^19 atoms * (3.016 g/mol / 6.022 * 10^23 atoms/mol) = 0.138 g

Therefore, on Jan 1, 2000, there will be 2.76 * 10^19 atoms of 3He and 0.138 grams of 3He.

(ii) To calculate the remaining amount of 3H, we can use the fact that the initial amount of 3H was 10 Ci, and we have already calculated the amount of 3H that has decayed into 3He. Therefore, the remaining amount of 3H is:

10 Ci - 2.76 Ci = 7.24 Ci

To convert this into grams, we can use the conversion factor:

1 Ci = 3.7 * 10^10 disintegrations/s

Therefore,

7.24 Ci * (3.7 * 10^10 disintegrations/s/Ci) * (1 mol/6.022 * 10^23 atoms) * (3.016 g/mol) = 0.015 g

Therefore, on Jan 1, 2000, there will be 0.015 grams of 3H remaining.

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Answer:

4

Explanation:

A carbon atom has 4 electrons in its outermost shell (2s^2p^2).  All are unpaired (none share their orbital with another electron).  So all four are anxious to pair with another electron.  Once it has found 4 more electrons contributed from other atom(s), it will have 4 pairs of shared electrons.

Hydrogen has one lone electron.  An atom of H is downright gleeful in sharing it's electron with elements such as carbon, C.  Since carbon has 4 unpaied electrons, it will combine with 4 H atoms.  At that point, cabon is sharing 4 electron pairs.

The defining feature of the Bohr model of the atom is the concept of quantized energy levels in which electrons can orbit the nucleus.

Bohr proposed that electrons orbit the nucleus in discrete, rather than continuous, energy levels. These levels of energy are quantized, which means they have a fixed value and do not vary continuously.

Bohr also proposed that electrons can move between these energy levels by absorbing or emitting energy, giving rise to the emission and absorption spectra seen in atomic spectra.

The Bohr model was the first successful attempt to describe the structure of an atom, and it helped to lay the groundwork for modern quantum mechanics.

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While most reagents should be kept on ice when not being used, sodium chloride is an exception to this rule. Sodium chloride can be stored at room temperature without any adverse effects. It is crucial to follow the appropriate storage conditions for each reagent to ensure accurate and reliable experimental results.

When it comes to keeping reagents on ice, most of them benefit from being stored at low temperatures to maintain their stability and prevent degradation. However, there is one reagent that should not be kept on ice, and that is sodium chloride (NaCl).

Sodium chloride is a commonly used reagent in laboratories and is often kept at room temperature. Unlike other reagents that may denature or lose their effectiveness when not chilled, sodium chloride remains stable and does not require refrigeration. This is because it is a salt that is highly soluble in water and does not undergo any chemical changes that would necessitate cold storage.

On the other hand, reagents such as enzymes, antibodies, or other temperature-sensitive solutions need to be kept on ice to preserve their functionality. These reagents are susceptible to degradation or denaturation when exposed to higher temperatures, which can affect their performance in experiments. Keeping them on ice helps maintain their activity and integrity.

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Answer:

Shape?

Explanation:

that's the only thing that would make sense

Answer:

Shape  

is the answer

Answer:

Explanation:

Zn + S ---> ZnS

Mass of Zinc + Mass of Sulphur = Mass of Zinc sulfide ( Law of conservation)

Mass of zinc= 65.4g

Mass of Sulfur =  32.1g

Mass of Zinc Sulfide= (65.4 + 32.1)g

Mass of Zinc Sulfide = 97.5g

Answer: Yes, gases are matter and have mass. So therefore all gasses have mass. :)

Answer:

69Ga=68.925580(3),71Ga=70.9247005(3)

The concentration of H2CO3 is 4.9 × 10−7 M, and the concentration of CO32− is 1.8 × 10−8 M. n:

Given,HCO3− concentration = 5.0 × 10−4 MPH = 7.8We have the following equation for the equilibrium between CO2, H2CO3, HCO3−, and CO32−:CO2 + H2O ⇌ H2CO3 ⇌ HCO3− + CO32−K1 = [H2CO3]/[CO2]K2 = [HCO3−]/[H2CO3]K3 = [CO32−]/[HCO3−]K1 is the acid dissociation constant for H2CO3, K2 is the acid dissociation constant for HCO3−, and K3 is the base dissociation constant for CO32−.

The equation for K1 is:H2CO3 ⇌ H+ + HCO3−K1 = [H+][HCO3−]/[H2CO3]For every H2CO3 molecule that dissociates, one H+ and one HCO3− ion is produced. At equilibrium, the concentration of H2CO3 is given by:H2CO3 = [H+][HCO3−]/K1Plugging in the values:H2CO3 = (10−7.8)(5.0 × 10−4)/4.45 × 10−7 = 4.9 × 10−7 MFor every H2CO3 molecule that dissociates, one HCO3− and one H+ ion is produced. The equilibrium concentration of HCO3− is given by:HCO3− = K1[H2CO3]/[H+]Plugging in the values:HCO3− = 4.45 × 10−7 (4.9 × 10−7)/(10−7.8) = 1.8 × 10−8 MTherefore, the concentration of H2CO3 is 4.9 × 10−7 M, and the concentration of CO32− is 1.8 × 10−8 M.

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Explanation:

14) We need to find the # of moles of NaOH in 3.5 L solution. Note: 1 M = 1 mol/Ll

(3.00 mol NaOH/1 L)(3.5 L) = 10.5 mol NaOH

Next we need find the volume of 19.4M NaOH solution that contains 10.5 mol NaOH:

(10.5 mol NaOH)×(1 L NaOH/19.4 mol NaOH)

= 0.541 L NaOH

This means that 0.541 L (541 mL) of 19.4M NaOH solution must be diluted to 3.5 L in order to get 3.00M NaOH solution.

15) 425 mL (0.425 L) of 0.105M HCl solution contains

(0.105 mol HCl/1 L)×(0.425 L) = 0.0446 mol HCl

so when enough water is added to 1L, the molarity becomes

0.0446 mol HCl/1 L = 0.0446M HCl

16) CaBr2 ---> Ca^+2 + 2Br^-1

For every Ca^+2 ion in the solution, you have 2 Br^-1 ions

If the concentration of CaBr2 is 6 mol/L (or 6M),.then the concentration of Br^-1 irons is

[Br^-1] = 2×[Ca^+2] = 2×(6 mol/L) = 12 mol Br^-1/L

17) The reason you won't need 1.0 L of water is that part of the volume of the solution is taken up by the NaOH so you will always need slightly less than 1 L.

The portion of the titration curve of a strong base with a strong acid is the same as the region before the endpoint is reached for a weak base titrated with a strong acid. The correct answer is Option C.

Titration refers to the process of measuring the volume of one solution required to react with a given volume of another solution completely. The titration curve is a graph that shows the change in pH during a titration.

The pH changes quickly from acidic to basic as the volume of strong base added approaches the stoichiometric point. It can be observed that the pH of the strong base solution is high, but as it is titrated with an acid, its pH decreases. The graph gradually falls as the acid is added, finally reaching a sharp rise known as the equivalence point or endpoint. As a result, the correct option is c. the portion before the endpoint is reached.

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Answer:

I am not 100% sure but I think it is 26.981538

Explanation:

As a result, 0.231liters of the 0.150M potassium iodide solution would be required to thoroughly react with the supplied lead(II) nitrate solution.

When a solution of potassium iodide is introduced to a solution of lead nitrate in a test tube, a yellowish solid precipitates.

Lead iodide is a whitish solid. Along with lead iodide, potassium nitrate is generated. This is a reaction with two displacements.

The reaction between lead nitrate [Pb(NO3)2] and potassium iodide (Kl) results in the creation of potassium nitrate (KNO3) and a yellow precipitate of lead iodide (PbI2).

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Answer:As the ball is at 70 degree celsius and the water is at 30 degree celsius, the heat flow will take place from the hot metal ball towards the water which is at low temperature.

Explanation:

Therefore,  there will be a decrease in the temperature of the metal ball.

The first level of DNA organization in a eukaryotic cell is maintained by histone molecule. A histone is a protein that gives chromosomes structural support.

A kind of protein that is present in chromosomes. Histones bind to DNA, assist shape chromosomes, and regulate the expression of genes. The lengthy DNA molecules that make up each chromosome must fit inside the cell nucleus. The chromosome takes on a more compact shape as a result of the DNA wrapping around complexes of histone proteins.

Eukaryotic creatures are big and complicated because eukaryotic cells include nuclei that are encased in nuclear membranes. Eukaryotic cells are found in protozoa, fungi, plants, and mammals. A membrane-bound nucleus is a feature of eukaryotic cells. Chloroplasts can be found in plants and algae, while other membrane-bound organelles like the mitochondria and golgi apparatus are frequently seen in eukaryotic cells.

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Answer:

Now, the molar solubility of lead(II) phosphate in water is said to be equal to 6.2⋅10−12mol L−1 . This means that in one liter of water, presumably at room temperature, you can only hope to dissolve 6.2⋅10−12 moles of lead(II) phosphate.

Explanation:

Hope this helps!!

In order to determine if a chemical hazard truly exists, there are several pertinent pieces of chemical information that must be considered. Firstly, the chemical composition of the substance in question must be examined, including its molecular formula and structural properties.

This information can help to determine the potential toxicity and reactivity of the chemical, as well as its potential routes of exposure (e.g. inhalation, ingestion, skin contact).

Additionally, data on the physical properties of the chemical - such as its melting point, boiling point, and solubility - can be important in determining how the substance may behave in different environments and under different conditions.

Finally, information on the potential environmental impact of the chemical, such as its persistence in the environment or its potential to bioaccumulate, can also be crucial in assessing the overall hazard posed by the substance.

By considering all of these factors together, a comprehensive picture of the potential hazards associated with a particular chemical can be developed, helping to inform appropriate risk management strategies and protective measures.

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Answer:

D. Low temperatures inhibit the metabolism and growth of microbes.

Explanation:

In low temperatures, the metabolic rate of microbes slows down. This is because higher temperatures are a more optimal environment for them to grow in.

Answer:

There are 10 neutrons

Explanation:

Because the atomic number is 8 and the isotope number is 18 (which is the collective protons and neutrons), we can do

18-8=10

Answer:

10

Explanation:

8 proton because it is oxygen

10 neutron because 18-8

Answer:

50 kJ

Explanation:

Activation energy is the energy to go from reactants at 150  to   200 kJ

 = 50 kJ

The only correct statement among the options as they are listed is that; A solute dissolves in a solvent to make up a solution (Option B)

A solution is composed of a solute and a solvent. The solute is the solid that is dissolved in the solvent while the solvent is the medium in which the solid is dissolved.

Given that the solute can be a solid, liquid or gas, a solution could be homo--genous or het--erogenous as the case may be.

Thus, the only correct statement among the options as they are listed is that; A solute dissolves in a solvent to make up a solution (Option B)

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Baking soda, or sodium bicarbonate (NaHCO3), dissolves in water to create an aqueous solution. Sodium bicarbonate splits into sodium (Na) and bicarbonate (HCO3) ions when it is in contact with water

The chemical formula for bicarbonate, sometimes referred to as hydrogen carbonate, is HCO3 It is produced when carbon dioxide, water, and a base are combined. Acid-base equilibrium, respiration, digestion, and many other physiological activities in the human body all depend on bicarbonate. It is essential for buffering the blood's pH and preserving the ideal ratio of acids to bases. Moreover, bicarbonate is employed in a number of industrial procedures, including those that create glass, detergents, and food additives. Moreover, baking soda, also known as sodium bicarbonate (NaHCO3), is a salt that is frequently used in cooking, cleaning, and as an antacid to ease heartburn and

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Answer:

bamboo is the biggest/tallest grass in the world

Answer:

Giant Bamboo

Explanation:

Giant bamboo, which can grow up to 151 feet tall, is the largest variety of grass.

The reactions that are nuclear reactions are  B and D .

A chemical reaction is a process in which atoms or molecules are rearranged to form new substances. In the reaction shown in option A, two hydrogen ions (H+) and one hydroxide ion (OH-) combine to form a water molecule (H₂O). This is a chemical reaction because the atoms in the reactants are rearranged to form the products.

A nuclear reaction is a process in which the nucleus of an atom is changed. In the reactions shown in options B and D, the nucleus of an atom is changed by either emitting a particle or by splitting into two smaller nuclei. These are nuclear reactions because the nuclei of the reactants are changed to form the products.

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Answer:

B. The atom has two more electrons than an atom of oxygen.

Explanation:

In Chemistry, electrons can be defined as subatomic particles that are negatively charged and as such has a magnitude of -1.

Valence electrons can be defined as the number of electrons present in the outermost shell of an atom. Valence electrons are used to determine whether an atom or group of elements found in a periodic table can bond with others. Thus, this property is typically used to determine the chemical properties of elements.

Oxygen has a total number of eight (8) electrons while neon has total number of ten (10) electrons. Therefore, an atom of oxygen is able to gain (receive) two (2) more electrons in order to have the same electron arrangements as the noble gas i.e an atom of neon with an atomic number of 10.

This ultimately implies that, an \( O^{2-} \) atom contains the same number of electrons as an atom of neon.

Hence, a neon atom has two more electrons than an atom of oxygen.

Additionally, Neon is used in lighting advertising displays.

Answer:

no habla espanol

Explanation: